Start work on turning RSXML.framework into RSParser.framework.

2017-06-20 21:18:46 -07:00 · 2017-06-20 21:18:46 -07:00 · b00b2f39d7
parent cf77f19276
commit b00b2f39d7
47 changed files with 5241 additions and 0 deletions
--- a/Frameworks/RSParser/Feeds/FeedParser.h
+++ b/Frameworks/RSParser/Feeds/FeedParser.h
@ -0,0 +1,24 @@
+//
+//  FeedParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 7/12/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+@class RSParsedFeed;
+@class RSXMLData;
+
+
+@protocol FeedParser <NSObject>
+
+ (BOOL)canParseFeed:(RSXMLData * _Nonnull)xmlData;
+
+- (nonnull instancetype)initWithXMLData:(RSXMLData * _Nonnull)xmlData;
+
+- (nullable RSParsedFeed *)parseFeed:(NSError * _Nullable * _Nullable)error;
+
+
+@end
--- a/Frameworks/RSParser/Feeds/RSFeedParser.h
+++ b/Frameworks/RSParser/Feeds/RSFeedParser.h
@ -0,0 +1,28 @@
+//
+//  RSFeedParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 1/4/15.
+//  Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
+//
+
+#import "FeedParser.h"
+
+// If you have a feed and don’t know or care what it is (RSS or Atom),
+// then call RSParseFeed or RSParseFeedSync.
+
+@class RSXMLData;
+@class RSParsedFeed;
+
+NS_ASSUME_NONNULL_BEGIN
+
+BOOL RSCanParseFeed(RSXMLData *xmlData);
+
+
+typedef void (^RSParsedFeedBlock)(RSParsedFeed * _Nullable parsedFeed, NSError * _Nullable error);
+
+// callback is called on main queue.
+void RSParseFeed(RSXMLData *xmlData, RSParsedFeedBlock callback);
+RSParsedFeed * _Nullable RSParseFeedSync(RSXMLData *xmlData, NSError * _Nullable * _Nullable error);
+
+NS_ASSUME_NONNULL_END
--- a/Frameworks/RSParser/Feeds/RSFeedParser.m
+++ b/Frameworks/RSParser/Feeds/RSFeedParser.m
@ -0,0 +1,216 @@
+//
+//  FeedParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 1/4/15.
+//  Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
+//
+
+#import "RSFeedParser.h"
+#import "FeedParser.h"
+#import "RSXMLData.h"
+#import "RSRSSParser.h"
+#import "RSAtomParser.h"
+
+static NSArray *parserClasses(void) {
+	
+	static NSArray *gParserClasses = nil;
+	
+	static dispatch_once_t onceToken;
+	dispatch_once(&onceToken, ^{
+		
+		gParserClasses = @[[RSRSSParser class], [RSAtomParser class]];
+	});
+	
+	return gParserClasses;
+}
+
+static BOOL feedMayBeParseable(RSXMLData *xmlData) {
+	
+	/*Sanity checks.*/
+	
+	if (!xmlData.data) {
+		return NO;
+	}
+
+	/*TODO: check size, type, etc.*/
+	
+	return YES;
+}
+
+static BOOL optimisticCanParseRSSData(const char *bytes, NSUInteger numberOfBytes);
+static BOOL optimisticCanParseAtomData(const char *bytes, NSUInteger numberOfBytes);
+static BOOL optimisticCanParseRDF(const char *bytes, NSUInteger numberOfBytes);
+static BOOL dataIsProbablyHTML(const char *bytes, NSUInteger numberOfBytes);
+static BOOL dataIsSomeWeirdException(const char *bytes, NSUInteger numberOfBytes);
+static BOOL dataHasLeftCaret(const char *bytes, NSUInteger numberOfBytes);
+
+static const NSUInteger maxNumberOfBytesToSearch = 4096;
+static const NSUInteger minNumberOfBytesToSearch = 20;
+
+static Class parserClassForXMLData(RSXMLData *xmlData) {
+	
+	if (!feedMayBeParseable(xmlData)) {
+		return nil;
+	}
+	
+	// TODO: check for things like images and movies and return nil.
+	
+	const char *bytes = xmlData.data.bytes;
+	NSUInteger numberOfBytes = xmlData.data.length;
+	
+	if (numberOfBytes > minNumberOfBytesToSearch) {
+		
+		if (numberOfBytes > maxNumberOfBytesToSearch) {
+			numberOfBytes = maxNumberOfBytesToSearch;
+		}
+
+		if (!dataHasLeftCaret(bytes, numberOfBytes)) {
+			return nil;
+		}
+
+		if (optimisticCanParseRSSData(bytes, numberOfBytes)) {
+			return [RSRSSParser class];
+		}
+		if (optimisticCanParseAtomData(bytes, numberOfBytes)) {
+			return [RSAtomParser class];
+		}
+		
+		if (optimisticCanParseRDF(bytes, numberOfBytes)) {
+			return nil; //TODO: parse RDF feeds
+		}
+		
+		if (dataIsProbablyHTML(bytes, numberOfBytes)) {
+			return nil;
+		}
+		if (dataIsSomeWeirdException(bytes, numberOfBytes)) {
+			return nil;
+		}
+	}
+	
+	for (Class parserClass in parserClasses()) {
+		if ([parserClass canParseFeed:xmlData]) {
+			return [[parserClass alloc] initWithXMLData:xmlData];
+		}
+	}
+	
+	return nil;
+}
+
+static id<FeedParser> parserForXMLData(RSXMLData *xmlData) {
+	
+	Class parserClass = parserClassForXMLData(xmlData);
+	if (!parserClass) {
+		return nil;
+	}
+	return [[parserClass alloc] initWithXMLData:xmlData];
+}
+
+static BOOL canParseXMLData(RSXMLData *xmlData) {
+	
+	return parserClassForXMLData(xmlData) != nil;
+}
+
+static BOOL didFindString(const char *string, const char *bytes, NSUInteger numberOfBytes) {
+	
+	char *foundString = strnstr(bytes, string, numberOfBytes);
+	return foundString != NULL;
+}
+
+static BOOL dataHasLeftCaret(const char *bytes, NSUInteger numberOfBytes) {
+
+	return didFindString("<", bytes, numberOfBytes);
+}
+
+static BOOL dataIsProbablyHTML(const char *bytes, NSUInteger numberOfBytes) {
+	
+	// Won’t catch every single case, which is fine.
+	
+	if (didFindString("<html", bytes, numberOfBytes)) {
+		return YES;
+	}
+	if (didFindString("<body", bytes, numberOfBytes)) {
+		return YES;
+	}
+	if (didFindString("doctype html", bytes, numberOfBytes)) {
+		return YES;
+	}
+	if (didFindString("DOCTYPE html", bytes, numberOfBytes)) {
+		return YES;
+	}
+	if (didFindString("DOCTYPE HTML", bytes, numberOfBytes)) {
+		return YES;
+	}
+	if (didFindString("<meta", bytes, numberOfBytes)) {
+		return YES;
+	}
+	if (didFindString("<HTML", bytes, numberOfBytes)) {
+		return YES;
+	}
+	
+	return NO;
+}
+
+static BOOL dataIsSomeWeirdException(const char *bytes, NSUInteger numberOfBytes) {
+
+	if (didFindString("<errors xmlns='http://schemas.google", bytes, numberOfBytes)) {
+		return YES;
+	}
+
+	return NO;
+}
+
+static BOOL optimisticCanParseRDF(const char *bytes, NSUInteger numberOfBytes) {
+	
+	return didFindString("<rdf:RDF", bytes, numberOfBytes);
+}
+
+static BOOL optimisticCanParseRSSData(const char *bytes, NSUInteger numberOfBytes) {
+	
+	if (!didFindString("<rss", bytes, numberOfBytes)) {
+		return NO;
+	}
+	return didFindString("<channel", bytes, numberOfBytes);
+}
+
+static BOOL optimisticCanParseAtomData(const char *bytes, NSUInteger numberOfBytes) {
+	
+	return didFindString("<feed", bytes, numberOfBytes);
+}
+
+static void callCallback(RSParsedFeedBlock callback, RSParsedFeed *parsedFeed, NSError *error) {
+	
+	dispatch_async(dispatch_get_main_queue(), ^{
+		
+		@autoreleasepool {
+			if (callback) {
+				callback(parsedFeed, error);
+			}
+		}
+	});
+}
+
+
+#pragma mark - API
+
+BOOL RSCanParseFeed(RSXMLData *xmlData) {
+
+	return canParseXMLData(xmlData);
+}
+
+void RSParseFeed(RSXMLData *xmlData, RSParsedFeedBlock callback) {
+
+	dispatch_async(dispatch_get_global_queue(QOS_CLASS_UTILITY, 0), ^{
+
+		NSError *error = nil;
+		RSParsedFeed *parsedFeed = RSParseFeedSync(xmlData, &error);
+		callCallback(callback, parsedFeed, error);
+	});
+}
+
+RSParsedFeed *RSParseFeedSync(RSXMLData *xmlData, NSError **error) {
+
+	id<FeedParser> parser = parserForXMLData(xmlData);
+	return [parser parseFeed:error];
+}
+
--- a/Frameworks/RSParser/Feeds/RSParsedArticle.h
+++ b/Frameworks/RSParser/Feeds/RSParsedArticle.h
@ -0,0 +1,32 @@
+//
+//  RSParsedArticle.h
+//  RSXML
+//
+//  Created by Brent Simmons on 12/6/14.
+//  Copyright (c) 2014 Ranchero Software LLC. All rights reserved.
+//
+
+@import Foundation;
+
+
+@interface RSParsedArticle : NSObject
+
+- (nonnull instancetype)initWithFeedURL:(NSString * _Nonnull)feedURL;
+
+@property (nonatomic, readonly, nonnull) NSString *feedURL;
+@property (nonatomic, nonnull) NSString *articleID; //Calculated. Don't get until other properties have been set.
+
+@property (nonatomic, nullable) NSString *guid;
+@property (nonatomic, nullable) NSString *title;
+@property (nonatomic, nullable) NSString *body;
+@property (nonatomic, nullable) NSString *link;
+@property (nonatomic, nullable) NSString *permalink;
+@property (nonatomic, nullable) NSString *author;
+@property (nonatomic, nullable) NSDate *datePublished;
+@property (nonatomic, nullable) NSDate *dateModified;
+@property (nonatomic, nonnull) NSDate *dateParsed;
+
+- (void)calculateArticleID; // Optimization. Call after all properties have been set. Call on a background thread.
+
+@end
+
--- a/Frameworks/RSParser/Feeds/RSParsedArticle.m
+++ b/Frameworks/RSParser/Feeds/RSParsedArticle.m
@ -0,0 +1,101 @@
+//
+//  RSParsedArticle.m
+//  RSXML
+//
+//  Created by Brent Simmons on 12/6/14.
+//  Copyright (c) 2014 Ranchero Software LLC. All rights reserved.
+//
+
+#import "RSParsedArticle.h"
+#import "RSXMLInternal.h"
+
+
+@implementation RSParsedArticle
+
+
+#pragma mark - Init
+
+- (instancetype)initWithFeedURL:(NSString *)feedURL {
+	
+	NSParameterAssert(feedURL != nil);
+	
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+	
+	_feedURL = feedURL;
+	_dateParsed = [NSDate date];
+	
+	return self;
+}
+
+
+#pragma mark - Accessors
+
+- (NSString *)articleID {
+	
+	if (!_articleID) {
+		_articleID = self.calculatedUniqueID;
+	}
+	
+	return _articleID;
+}
+
+
+- (NSString *)calculatedUniqueID {
+
+	/*guid+feedID, or a combination of properties when no guid. Then hash the result.
+		In general, feeds should have guids. When they don't, re-runs are very likely,
+		because there's no other 100% reliable way to determine identity.*/
+
+	NSMutableString *s = [NSMutableString stringWithString:@""];
+	
+	NSString *datePublishedTimeStampString = nil;
+	if (self.datePublished) {
+		datePublishedTimeStampString = [NSString stringWithFormat:@"%.0f", self.datePublished.timeIntervalSince1970];
+	}
+	
+	if (!RSXMLStringIsEmpty(self.guid)) {
+		[s appendString:self.guid];
+	}
+
+	else if (!RSXMLStringIsEmpty(self.link) && self.datePublished != nil) {
+		[s appendString:self.link];
+		[s appendString:datePublishedTimeStampString];
+	}
+
+	else if (!RSXMLStringIsEmpty(self.title) && self.datePublished != nil) {
+		[s appendString:self.title];
+		[s appendString:datePublishedTimeStampString];
+	}
+
+	else if (self.datePublished != nil) {
+		[s appendString:datePublishedTimeStampString];
+	}
+
+	else if (!RSXMLStringIsEmpty(self.link)) {
+		[s appendString:self.link];
+	}
+
+	else if (!RSXMLStringIsEmpty(self.title)) {
+		[s appendString:self.title];
+	}
+	
+	else if (!RSXMLStringIsEmpty(self.body)) {
+		[s appendString:self.body];
+	}
+
+	NSAssert(!RSXMLStringIsEmpty(self.feedURL), nil);
+	[s appendString:self.feedURL];
+
+	return [s rsxml_md5HashString];
+}
+
+- (void)calculateArticleID {
+	
+	(void)self.articleID;
+}
+
+@end
+
--- a/Frameworks/RSParser/Feeds/RSParsedFeed.h
+++ b/Frameworks/RSParser/Feeds/RSParsedFeed.h
@ -0,0 +1,22 @@
+//
+//  RSParsedFeed.h
+//  RSXML
+//
+//  Created by Brent Simmons on 7/12/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+@class RSParsedArticle;
+
+@interface RSParsedFeed : NSObject
+
+- (nonnull instancetype)initWithURLString:(NSString * _Nonnull)urlString title:(NSString * _Nullable)title link:(NSString * _Nullable)link articles:(NSArray <RSParsedArticle *>* _Nonnull)articles;
+
+@property (nonatomic, readonly, nonnull) NSString *urlString;
+@property (nonatomic, readonly, nullable) NSString *title;
+@property (nonatomic, readonly, nullable) NSString *link;
+@property (nonatomic, readonly, nonnull) NSSet <RSParsedArticle *>*articles;
+
+@end
--- a/Frameworks/RSParser/Feeds/RSParsedFeed.m
+++ b/Frameworks/RSParser/Feeds/RSParsedFeed.m
@ -0,0 +1,29 @@
+//
+//  RSParsedFeed.m
+//  RSXML
+//
+//  Created by Brent Simmons on 7/12/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSParsedFeed.h"
+
+@implementation RSParsedFeed
+
+- (instancetype)initWithURLString:(NSString *)urlString title:(NSString *)title link:(NSString *)link articles:(NSSet *)articles {
+	
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+	
+	_urlString = urlString;
+	_title = title;
+	_link = link;
+	_articles = articles;
+	
+	return self;
+}
+
+
+@end
--- a/Frameworks/RSParser/HTML/RSHTMLLinkParser.h
+++ b/Frameworks/RSParser/HTML/RSHTMLLinkParser.h
@ -0,0 +1,31 @@
+//
+//  RSHTMLLinkParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 8/7/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+/*Returns all <a href="some_url">some_text</a> as RSHTMLLink object array.*/
+
+@class RSXMLData;
+@class RSHTMLLink;
+
+@interface RSHTMLLinkParser : NSObject
+
+ (NSArray <RSHTMLLink *> *)htmlLinksWithData:(RSXMLData *)xmlData;
+
+@end
+
+
+@interface RSHTMLLink : NSObject
+
+// Any of these, even urlString, may be nil, because HTML can be bad.
+
+@property (nonatomic, readonly) NSString *urlString; //absolute
+@property (nonatomic, readonly) NSString *text;
+@property (nonatomic, readonly) NSString *title; //title attribute inside anchor tag
+
+@end
--- a/Frameworks/RSParser/HTML/RSHTMLLinkParser.m
+++ b/Frameworks/RSParser/HTML/RSHTMLLinkParser.m
@ -0,0 +1,151 @@
+//
+//  RSHTMLLinkParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 8/7/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import <libxml/xmlstring.h>
+#import "RSHTMLLinkParser.h"
+#import "RSSAXHTMLParser.h"
+#import "RSSAXParser.h"
+#import "RSXMLData.h"
+#import "RSXMLInternal.h"
+
+
+@interface RSHTMLLinkParser() <RSSAXHTMLParserDelegate>
+
+@property (nonatomic, readonly) NSMutableArray *links;
+@property (nonatomic, readonly) RSXMLData *xmlData;
+@property (nonatomic, readonly) NSMutableArray *dictionaries;
+@property (nonatomic, readonly) NSURL *baseURL;
+
+@end
+
+
+@interface RSHTMLLink()
+
+@property (nonatomic, readwrite) NSString *urlString; //absolute
+@property (nonatomic, readwrite) NSString *text;
+@property (nonatomic, readwrite) NSString *title; //title attribute inside anchor tag
+
+@end
+
+
+@implementation RSHTMLLinkParser
+
+
+#pragma mark - Class Methods
+
+ (NSArray *)htmlLinksWithData:(RSXMLData *)xmlData {
+
+	RSHTMLLinkParser *parser = [[self alloc] initWithXMLData:xmlData];
+	return parser.links;
+}
+
+
+#pragma mark - Init
+
+- (instancetype)initWithXMLData:(RSXMLData *)xmlData {
+
+	NSParameterAssert(xmlData.data);
+	NSParameterAssert(xmlData.urlString);
+
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	_links = [NSMutableArray new];
+	_xmlData = xmlData;
+	_dictionaries = [NSMutableArray new];
+	_baseURL = [NSURL URLWithString:xmlData.urlString];
+
+	[self parse];
+
+	return self;
+}
+
+
+#pragma mark - Parse
+
+- (void)parse {
+
+	RSSAXHTMLParser *parser = [[RSSAXHTMLParser alloc] initWithDelegate:self];
+	[parser parseData:self.xmlData.data];
+	[parser finishParsing];
+}
+
+
+- (RSHTMLLink *)currentLink {
+
+	return self.links.lastObject;
+}
+
+
+static NSString *kHrefKey = @"href";
+
+- (NSString *)urlStringFromDictionary:(NSDictionary *)d {
+
+	NSString *href = [d rsxml_objectForCaseInsensitiveKey:kHrefKey];
+	if (!href) {
+		return nil;
+	}
+
+	NSURL *absoluteURL = [NSURL URLWithString:href relativeToURL:self.baseURL];
+	return absoluteURL.absoluteString;
+}
+
+
+static NSString *kTitleKey = @"title";
+
+- (NSString *)titleFromDictionary:(NSDictionary *)d {
+
+	return [d rsxml_objectForCaseInsensitiveKey:kTitleKey];
+}
+
+
+- (void)handleLinkAttributes:(NSDictionary *)d {
+
+	RSHTMLLink *link = self.currentLink;
+	link.urlString = [self urlStringFromDictionary:d];
+	link.title = [self titleFromDictionary:d];
+}
+
+
+static const char *kAnchor = "a";
+static const NSInteger kAnchorLength = 2;
+
+- (void)saxParser:(RSSAXHTMLParser *)SAXParser XMLStartElement:(const xmlChar *)localName attributes:(const xmlChar **)attributes {
+
+	if (!RSSAXEqualTags(localName, kAnchor, kAnchorLength)) {
+		return;
+	}
+
+	RSHTMLLink *link = [RSHTMLLink new];
+	[self.links addObject:link];
+
+	NSDictionary *d = [SAXParser attributesDictionary:attributes];
+	if (!RSXMLIsEmpty(d)) {
+		[self handleLinkAttributes:d];
+	}
+
+	[SAXParser beginStoringCharacters];
+}
+
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const xmlChar *)localName {
+
+	if (!RSSAXEqualTags(localName, kAnchor, kAnchorLength)) {
+		return;
+	}
+
+	self.currentLink.text = SAXParser.currentStringWithTrimmedWhitespace;
+}
+
+@end
+
+@implementation RSHTMLLink
+
+@end
--- a/Frameworks/RSParser/HTML/RSHTMLMetadata.h
+++ b/Frameworks/RSParser/HTML/RSHTMLMetadata.h
@ -0,0 +1,45 @@
+//
+//  RSHTMLMetadata.h
+//  RSXML
+//
+//  Created by Brent Simmons on 3/6/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+@class RSHTMLMetadataFeedLink;
+@class RSHTMLMetadataAppleTouchIcon;
+
+
+@interface RSHTMLMetadata : NSObject
+
+- (instancetype)initWithURLString:(NSString *)urlString dictionaries:(NSArray <NSDictionary *> *)dictionaries;
+
+@property (nonatomic, readonly) NSString *baseURLString;
+@property (nonatomic, readonly) NSArray <NSDictionary *> *dictionaries;
+
+@property (nonatomic, readonly) NSString *faviconLink;
+@property (nonatomic, readonly) NSArray <RSHTMLMetadataAppleTouchIcon *> *appleTouchIcons;
+@property (nonatomic, readonly) NSArray <RSHTMLMetadataFeedLink *> *feedLinks;
+
+@end
+
+
+@interface RSHTMLMetadataAppleTouchIcon : NSObject
+
+@property (nonatomic, readonly) NSString *rel;
+@property (nonatomic, readonly) NSString *sizes;
+@property (nonatomic, readonly) NSString *urlString; // Absolute.
+
+@end
+
+
+@interface RSHTMLMetadataFeedLink : NSObject
+
+@property (nonatomic, readonly) NSString *title;
+@property (nonatomic, readonly) NSString *type;
+@property (nonatomic, readonly) NSString *urlString; // Absolute.
+
+@end
+
--- a/Frameworks/RSParser/HTML/RSHTMLMetadata.m
+++ b/Frameworks/RSParser/HTML/RSHTMLMetadata.m
@ -0,0 +1,245 @@
+//
+//  RSHTMLMetadata.m
+//  RSXML
+//
+//  Created by Brent Simmons on 3/6/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSHTMLMetadata.h"
+#import "RSXMLInternal.h"
+
+static NSString *urlStringFromDictionary(NSDictionary *d);
+static NSString *absoluteURLStringWithRelativeURLString(NSString *relativeURLString, NSString *baseURLString);
+static NSString *absoluteURLStringWithDictionary(NSDictionary *d, NSString *baseURLString);
+static NSArray *objectsOfClassWithDictionaries(Class class, NSArray *dictionaries, NSString *baseURLString);
+static NSString *relValue(NSDictionary *d);
+static BOOL typeIsFeedType(NSString *type);
+
+static NSString *kShortcutIconRelValue = @"shortcut icon";
+static NSString *kHrefKey = @"href";
+static NSString *kSrcKey = @"src";
+static NSString *kAppleTouchIconValue = @"apple-touch-icon";
+static NSString *kAppleTouchIconPrecomposedValue = @"apple-touch-icon-precomposed";
+static NSString *kSizesKey = @"sizes";
+static NSString *kTitleKey = @"title";
+static NSString *kRelKey = @"rel";
+static NSString *kAlternateKey = @"alternate";
+static NSString *kRSSSuffix = @"/rss+xml";
+static NSString *kAtomSuffix = @"/atom+xml";
+static NSString *kTypeKey = @"type";
+
+@interface RSHTMLMetadataAppleTouchIcon ()
+
+- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString;
+
+@end
+
+
+@interface RSHTMLMetadataFeedLink ()
+
+- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString;
+
+@end
+
+
+@implementation RSHTMLMetadata
+
+
+#pragma mark - Init
+
+- (instancetype)initWithURLString:(NSString *)urlString dictionaries:(NSArray <NSDictionary *> *)dictionaries {
+
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	_baseURLString = urlString;
+	_dictionaries = dictionaries;
+	_faviconLink = [self resolvedLinkFromFirstDictionaryWithMatchingRel:kShortcutIconRelValue];
+
+	NSArray *appleTouchIconDictionaries = [self appleTouchIconDictionaries];
+	_appleTouchIcons = objectsOfClassWithDictionaries([RSHTMLMetadataAppleTouchIcon class], appleTouchIconDictionaries, urlString);
+
+	NSArray *feedLinkDictionaries = [self feedLinkDictionaries];
+	_feedLinks = objectsOfClassWithDictionaries([RSHTMLMetadataFeedLink class], feedLinkDictionaries, urlString);
+
+	return self;
+}
+
+
+#pragma mark - Private
+
+- (NSDictionary *)firstDictionaryWithMatchingRel:(NSString *)valueToMatch {
+
+	// Case-insensitive.
+
+	for (NSDictionary *oneDictionary in self.dictionaries) {
+
+		NSString *oneRelValue = relValue(oneDictionary);
+		if (oneRelValue && [oneRelValue compare:valueToMatch options:NSCaseInsensitiveSearch] == NSOrderedSame) {
+			return oneDictionary;
+		}
+	}
+
+	return nil;
+}
+
+
+- (NSArray *)appleTouchIconDictionaries {
+
+	NSMutableArray *dictionaries = [NSMutableArray new];
+
+	for (NSDictionary *oneDictionary in self.dictionaries) {
+
+		NSString *oneRelValue = relValue(oneDictionary).lowercaseString;
+		if ([oneRelValue isEqualToString:kAppleTouchIconValue] || [oneRelValue isEqualToString:kAppleTouchIconPrecomposedValue]) {
+			[dictionaries addObject:oneDictionary];
+		}
+	}
+
+	return dictionaries;
+}
+
+
+- (NSArray *)feedLinkDictionaries {
+
+	NSMutableArray *dictionaries = [NSMutableArray new];
+
+	for (NSDictionary *oneDictionary in self.dictionaries) {
+
+		NSString *oneRelValue = relValue(oneDictionary).lowercaseString;
+		if (![oneRelValue isEqualToString:kAlternateKey]) {
+			continue;
+		}
+
+		NSString *oneType = [oneDictionary rsxml_objectForCaseInsensitiveKey:kTypeKey];
+		if (!typeIsFeedType(oneType)) {
+			continue;
+		}
+
+		if (RSXMLStringIsEmpty(urlStringFromDictionary(oneDictionary))) {
+			continue;
+		}
+
+		[dictionaries addObject:oneDictionary];
+	}
+
+	return dictionaries;
+}
+
+
+- (NSString *)resolvedLinkFromFirstDictionaryWithMatchingRel:(NSString *)relValue {
+
+	NSDictionary *d = [self firstDictionaryWithMatchingRel:relValue];
+	return absoluteURLStringWithDictionary(d, self.baseURLString);
+}
+
+
+@end
+
+
+static NSString *relValue(NSDictionary *d) {
+
+	return [d rsxml_objectForCaseInsensitiveKey:kRelKey];
+}
+
+
+static NSString *urlStringFromDictionary(NSDictionary *d) {
+
+	NSString *urlString = [d rsxml_objectForCaseInsensitiveKey:kHrefKey];
+	if (urlString) {
+		return urlString;
+	}
+
+	return [d rsxml_objectForCaseInsensitiveKey:kSrcKey];
+}
+
+
+static NSString *absoluteURLStringWithRelativeURLString(NSString *relativeURLString, NSString *baseURLString) {
+
+	NSURL *url = [NSURL URLWithString:baseURLString];
+	if (!url) {
+		return nil;
+	}
+
+	NSURL *absoluteURL = [NSURL URLWithString:relativeURLString relativeToURL:url];
+	return absoluteURL.absoluteString;
+}
+
+
+static NSString *absoluteURLStringWithDictionary(NSDictionary *d, NSString *baseURLString) {
+
+	NSString *urlString = urlStringFromDictionary(d);
+	if (RSXMLStringIsEmpty(urlString)) {
+		return nil;
+	}
+	return absoluteURLStringWithRelativeURLString(urlString, baseURLString);
+}
+
+
+static NSArray *objectsOfClassWithDictionaries(Class class, NSArray *dictionaries, NSString *baseURLString) {
+
+	NSMutableArray *objects = [NSMutableArray new];
+
+	for (NSDictionary *oneDictionary in dictionaries) {
+
+		id oneObject = [[class alloc] initWithDictionary:oneDictionary baseURLString:baseURLString];
+		if (oneObject) {
+			[objects addObject:oneObject];
+		}
+	}
+
+	return [objects copy];
+}
+
+
+static BOOL typeIsFeedType(NSString *type) {
+
+	type = type.lowercaseString;
+	return [type hasSuffix:kRSSSuffix] || [type hasSuffix:kAtomSuffix];
+}
+
+
+@implementation RSHTMLMetadataAppleTouchIcon
+
+
+- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString {
+
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	_urlString = absoluteURLStringWithDictionary(d, baseURLString);
+	_sizes = [d rsxml_objectForCaseInsensitiveKey:kSizesKey];
+	_rel = [d rsxml_objectForCaseInsensitiveKey:kRelKey];
+
+	return self;
+}
+
+
+@end
+
+
+@implementation RSHTMLMetadataFeedLink
+
+
+- (instancetype)initWithDictionary:(NSDictionary *)d baseURLString:(NSString *)baseURLString {
+
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	_urlString = absoluteURLStringWithDictionary(d, baseURLString);
+	_title = [d rsxml_objectForCaseInsensitiveKey:kTitleKey];
+	_type = [d rsxml_objectForCaseInsensitiveKey:kTypeKey];
+
+	return self;
+}
+
+
+@end
+
--- a/Frameworks/RSParser/HTML/RSHTMLMetadataParser.h
+++ b/Frameworks/RSParser/HTML/RSHTMLMetadataParser.h
@ -0,0 +1,28 @@
+//
+//  RSHTMLMetadataParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 3/6/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+
+@class RSHTMLMetadata;
+@class RSXMLData;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RSHTMLMetadataParser : NSObject
+
+ (RSHTMLMetadata *)HTMLMetadataWithXMLData:(RSXMLData *)xmlData;
+
+- (instancetype)initWithXMLData:(RSXMLData *)xmlData;
+
+@property (nonatomic, readonly) RSHTMLMetadata *metadata;
+
+
+@end
+
+NS_ASSUME_NONNULL_END
--- a/Frameworks/RSParser/HTML/RSHTMLMetadataParser.m
+++ b/Frameworks/RSParser/HTML/RSHTMLMetadataParser.m
@ -0,0 +1,129 @@
+//
+//  RSHTMLMetadataParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 3/6/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import <libxml/xmlstring.h>
+#import "RSHTMLMetadataParser.h"
+#import "RSXMLData.h"
+#import "RSHTMLMetadata.h"
+#import "RSSAXHTMLParser.h"
+#import "RSSAXParser.h"
+#import "RSXMLInternal.h"
+
+
+@interface RSHTMLMetadataParser () <RSSAXHTMLParserDelegate>
+
+@property (nonatomic, readonly) RSXMLData *xmlData;
+@property (nonatomic, readwrite) RSHTMLMetadata *metadata;
+@property (nonatomic) NSMutableArray *dictionaries;
+@property (nonatomic) BOOL didFinishParsing;
+
+@end
+
+
+@implementation RSHTMLMetadataParser
+
+
+#pragma mark - Class Methods
+
+ (RSHTMLMetadata *)HTMLMetadataWithXMLData:(RSXMLData *)xmlData {
+
+	RSHTMLMetadataParser *parser = [[self alloc] initWithXMLData:xmlData];
+	return parser.metadata;
+}
+
+
+#pragma mark - Init
+
+- (instancetype)initWithXMLData:(RSXMLData *)xmlData {
+
+	NSParameterAssert(xmlData.data);
+	NSParameterAssert(xmlData.urlString);
+
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	_xmlData = xmlData;
+	_dictionaries = [NSMutableArray new];
+
+	[self parse];
+
+	return self;
+}
+
+
+#pragma mark - Parse
+
+- (void)parse {
+
+	RSSAXHTMLParser *parser = [[RSSAXHTMLParser alloc] initWithDelegate:self];
+	[parser parseData:self.xmlData.data];
+	[parser finishParsing];
+
+	self.metadata = [[RSHTMLMetadata alloc] initWithURLString:self.xmlData.urlString dictionaries:[self.dictionaries copy]];
+}
+
+
+static NSString *kHrefKey = @"href";
+static NSString *kSrcKey = @"src";
+static NSString *kRelKey = @"rel";
+
+- (NSString *)linkForDictionary:(NSDictionary *)d {
+
+	NSString *link = [d rsxml_objectForCaseInsensitiveKey:kHrefKey];
+	if (link) {
+		return link;
+	}
+
+	return [d rsxml_objectForCaseInsensitiveKey:kSrcKey];
+}
+
+
+- (void)handleLinkAttributes:(NSDictionary *)d {
+
+	if (RSXMLStringIsEmpty([d rsxml_objectForCaseInsensitiveKey:kRelKey])) {
+		return;
+	}
+	if (RSXMLStringIsEmpty([self linkForDictionary:d])) {
+		return;
+	}
+
+	[self.dictionaries addObject:d];
+}
+
+
+#pragma mark - RSSAXHTMLParserDelegate
+
+static const char *kBody = "body";
+static const NSInteger kBodyLength = 5;
+static const char *kLink = "link";
+static const NSInteger kLinkLength = 5;
+
+- (void)saxParser:(RSSAXHTMLParser *)SAXParser XMLStartElement:(const xmlChar *)localName attributes:(const xmlChar **)attributes {
+
+	if (self.didFinishParsing) {
+		return;
+	}
+	
+	if (RSSAXEqualTags(localName, kBody, kBodyLength)) {
+		self.didFinishParsing = YES;
+		return;
+	}
+
+	if (!RSSAXEqualTags(localName, kLink, kLinkLength)) {
+		return;
+	}
+
+	NSDictionary *d = [SAXParser attributesDictionary:attributes];
+	if (!RSXMLIsEmpty(d)) {
+		[self handleLinkAttributes:d];
+	}
+}
+
+@end
--- a/Frameworks/RSParser/HTML/RSSAXHTMLParser.h
+++ b/Frameworks/RSParser/HTML/RSSAXHTMLParser.h
@ -0,0 +1,49 @@
+//
+//  RSSAXHTMLParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 3/6/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+@class RSSAXHTMLParser;
+
+@protocol RSSAXHTMLParserDelegate <NSObject>
+
+@optional
+
+- (void)saxParser:(RSSAXHTMLParser *)SAXParser XMLStartElement:(const unsigned char *)localName attributes:(const unsigned char **)attributes;
+
+- (void)saxParser:(RSSAXHTMLParser *)SAXParser XMLEndElement:(const unsigned char *)localName;
+
+- (void)saxParser:(RSSAXHTMLParser *)SAXParser XMLCharactersFound:(const unsigned char *)characters length:(NSUInteger)length;
+
+- (void)saxParserDidReachEndOfDocument:(RSSAXHTMLParser *)SAXParser; // If canceled, may not get called (but might).
+
+@end
+
+
+@interface RSSAXHTMLParser : NSObject
+
+
+- (instancetype)initWithDelegate:(id<RSSAXHTMLParserDelegate>)delegate;
+
+- (void)parseData:(NSData *)data;
+- (void)parseBytes:(const void *)bytes numberOfBytes:(NSUInteger)numberOfBytes;
+- (void)finishParsing;
+- (void)cancel;
+
+@property (nonatomic, strong, readonly) NSData *currentCharacters; // nil if not storing characters. UTF-8 encoded.
+@property (nonatomic, strong, readonly) NSString *currentString; // Convenience to get string version of currentCharacters.
+@property (nonatomic, strong, readonly) NSString *currentStringWithTrimmedWhitespace;
+
+- (void)beginStoringCharacters; // Delegate can call from XMLStartElement. Characters will be available in XMLEndElement as currentCharacters property. Storing characters is stopped after each XMLEndElement.
+
+// Delegate can call from within XMLStartElement.
+
+- (NSDictionary *)attributesDictionary:(const unsigned char **)attributes;
+
+
+@end
--- a/Frameworks/RSParser/HTML/RSSAXHTMLParser.m
+++ b/Frameworks/RSParser/HTML/RSSAXHTMLParser.m
@ -0,0 +1,315 @@
+//
+//  RSSAXHTMLParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 3/6/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSSAXHTMLParser.h"
+#import "RSSAXParser.h"
+#import <libxml/tree.h>
+#import <libxml/xmlstring.h>
+#import <libxml/HTMLparser.h>
+#import "RSXMLInternal.h"
+
+
+@interface RSSAXHTMLParser ()
+
+@property (nonatomic) id<RSSAXHTMLParserDelegate> delegate;
+@property (nonatomic, assign) htmlParserCtxtPtr context;
+@property (nonatomic, assign) BOOL storingCharacters;
+@property (nonatomic) NSMutableData *characters;
+@property (nonatomic) BOOL delegateRespondsToStartElementMethod;
+@property (nonatomic) BOOL delegateRespondsToEndElementMethod;
+@property (nonatomic) BOOL delegateRespondsToCharactersFoundMethod;
+@property (nonatomic) BOOL delegateRespondsToEndOfDocumentMethod;
+
+@end
+
+
+@implementation RSSAXHTMLParser
+
+
+ (void)initialize {
+
+	RSSAXInitLibXMLParser();
+}
+
+
+#pragma mark - Init
+
+- (instancetype)initWithDelegate:(id<RSSAXHTMLParserDelegate>)delegate {
+
+	self = [super init];
+	if (self == nil)
+		return nil;
+
+	_delegate = delegate;
+
+	if ([_delegate respondsToSelector:@selector(saxParser:XMLStartElement:attributes:)]) {
+		_delegateRespondsToStartElementMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParser:XMLEndElement:)]) {
+		_delegateRespondsToEndElementMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParser:XMLCharactersFound:length:)]) {
+		_delegateRespondsToCharactersFoundMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParserDidReachEndOfDocument:)]) {
+		_delegateRespondsToEndOfDocumentMethod = YES;
+	}
+
+	return self;
+}
+
+
+#pragma mark - Dealloc
+
+- (void)dealloc {
+	
+	if (_context != nil) {
+		htmlFreeParserCtxt(_context);
+		_context = nil;
+	}
+	_delegate = nil;
+}
+
+
+#pragma mark - API
+
+static xmlSAXHandler saxHandlerStruct;
+
+- (void)parseData:(NSData *)data {
+
+	[self parseBytes:data.bytes numberOfBytes:data.length];
+}
+
+
+- (void)parseBytes:(const void *)bytes numberOfBytes:(NSUInteger)numberOfBytes {
+
+	if (self.context == nil) {
+
+		xmlCharEncoding characterEncoding = xmlDetectCharEncoding(bytes, (int)numberOfBytes);
+		self.context = htmlCreatePushParserCtxt(&saxHandlerStruct, (__bridge void *)self, nil, 0, nil, characterEncoding);
+		htmlCtxtUseOptions(self.context, XML_PARSE_RECOVER | XML_PARSE_NONET | HTML_PARSE_COMPACT);
+	}
+
+	@autoreleasepool {
+		htmlParseChunk(self.context, (const char *)bytes, (int)numberOfBytes, 0);
+	}
+}
+
+
+- (void)finishParsing {
+
+	NSAssert(self.context != nil, nil);
+	if (self.context == nil)
+		return;
+
+	@autoreleasepool {
+		htmlParseChunk(self.context, nil, 0, 1);
+		htmlFreeParserCtxt(self.context);
+		self.context = nil;
+		self.characters = nil;
+	}
+}
+
+
+- (void)cancel {
+
+	@autoreleasepool {
+		xmlStopParser(self.context);
+	}
+}
+
+
+
+- (void)beginStoringCharacters {
+	self.storingCharacters = YES;
+	self.characters = [NSMutableData new];
+}
+
+
+- (void)endStoringCharacters {
+	self.storingCharacters = NO;
+	self.characters = nil;
+}
+
+
+- (NSData *)currentCharacters {
+
+	if (!self.storingCharacters) {
+		return nil;
+	}
+
+	return self.characters;
+}
+
+
+- (NSString *)currentString {
+
+	NSData *d = self.currentCharacters;
+	if (RSXMLIsEmpty(d)) {
+		return nil;
+	}
+
+	return [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
+}
+
+
+- (NSString *)currentStringWithTrimmedWhitespace {
+	
+	return [self.currentString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
+}
+
+
+#pragma mark - Attributes Dictionary
+
+- (NSDictionary *)attributesDictionary:(const xmlChar **)attributes {
+
+	if (!attributes) {
+		return nil;
+	}
+
+	NSMutableDictionary *d = [NSMutableDictionary new];
+
+	NSInteger ix = 0;
+	NSString *currentKey = nil;
+	while (true) {
+
+		const xmlChar *oneAttribute = attributes[ix];
+		ix++;
+
+		if (!currentKey && !oneAttribute) {
+			break;
+		}
+
+		if (!currentKey) {
+			currentKey = [NSString stringWithUTF8String:(const char *)oneAttribute];
+		}
+		else {
+			NSString *value = nil;
+			if (oneAttribute) {
+				value = [NSString stringWithUTF8String:(const char *)oneAttribute];
+			}
+
+			d[currentKey] = value ? value : @"";
+			currentKey = nil;
+		}
+	}
+
+	return [d copy];
+}
+
+
+#pragma mark - Callbacks
+
+- (void)xmlEndDocument {
+
+	@autoreleasepool {
+		if (self.delegateRespondsToEndOfDocumentMethod) {
+			[self.delegate saxParserDidReachEndOfDocument:self];
+		}
+
+		[self endStoringCharacters];
+	}
+}
+
+
+- (void)xmlCharactersFound:(const xmlChar *)ch length:(NSUInteger)length {
+
+	@autoreleasepool {
+		if (self.storingCharacters) {
+			[self.characters appendBytes:(const void *)ch length:length];
+		}
+
+		if (self.delegateRespondsToCharactersFoundMethod) {
+			[self.delegate saxParser:self XMLCharactersFound:ch length:length];
+		}
+	}
+}
+
+
+- (void)xmlStartElement:(const xmlChar *)localName attributes:(const xmlChar **)attributes {
+
+	@autoreleasepool {
+		if (self.delegateRespondsToStartElementMethod) {
+
+			[self.delegate saxParser:self XMLStartElement:localName attributes:attributes];
+		}
+	}
+}
+
+
+- (void)xmlEndElement:(const xmlChar *)localName {
+
+	@autoreleasepool {
+		if (self.delegateRespondsToEndElementMethod) {
+			[self.delegate saxParser:self XMLEndElement:localName];
+		}
+
+		[self endStoringCharacters];
+	}
+}
+
+
+@end
+
+
+static void startElementSAX(void *context, const xmlChar *localname, const xmlChar **attributes) {
+
+	[(__bridge RSSAXHTMLParser *)context xmlStartElement:localname attributes:attributes];
+}
+
+
+static void	endElementSAX(void *context, const xmlChar *localname) {
+	[(__bridge RSSAXHTMLParser *)context xmlEndElement:localname];
+}
+
+
+static void	charactersFoundSAX(void *context, const xmlChar *ch, int len) {
+	[(__bridge RSSAXHTMLParser *)context xmlCharactersFound:ch length:(NSUInteger)len];
+}
+
+
+static void endDocumentSAX(void *context) {
+	[(__bridge RSSAXHTMLParser *)context xmlEndDocument];
+}
+
+
+static htmlSAXHandler saxHandlerStruct = {
+	nil,					/* internalSubset */
+	nil,					/* isStandalone   */
+	nil,					/* hasInternalSubset */
+	nil,					/* hasExternalSubset */
+	nil,					/* resolveEntity */
+	nil,					/* getEntity */
+	nil,					/* entityDecl */
+	nil,					/* notationDecl */
+	nil,					/* attributeDecl */
+	nil,					/* elementDecl */
+	nil,					/* unparsedEntityDecl */
+	nil,					/* setDocumentLocator */
+	nil,					/* startDocument */
+	endDocumentSAX,			/* endDocument */
+	startElementSAX,		/* startElement*/
+	endElementSAX,			/* endElement */
+	nil,					/* reference */
+	charactersFoundSAX,		/* characters */
+	nil,					/* ignorableWhitespace */
+	nil,					/* processingInstruction */
+	nil,					/* comment */
+	nil,					/* warning */
+	nil,					/* error */
+	nil,					/* fatalError //: unused error() get all the errors */
+	nil,					/* getParameterEntity */
+	nil,					/* cdataBlock */
+	nil,					/* externalSubset */
+	XML_SAX2_MAGIC,
+	nil,
+	nil,					/* startElementNs */
+	nil,					/* endElementNs */
+	nil						/* serror */
+};
+
--- a/Frameworks/RSParser/Info.plist
+++ b/Frameworks/RSParser/Info.plist
@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2017 Ranchero Software, LLC. All rights reserved.</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>
--- a/Frameworks/RSParser/RSParser.h
+++ b/Frameworks/RSParser/RSParser.h
@ -0,0 +1,40 @@
+//
+//  RSParser.h
+//  RSParser
+//
+//  Created by Brent Simmons on 6/20/17.
+//  Copyright © 2017 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+
+#import <RSXML/RSSAXParser.h>
+#import <RSXML/RSXMLData.h>
+
+#import <RSXML/RSFeedParser.h>
+#import <RSXML/FeedParser.h>
+#import <RSXML/RSAtomParser.h>
+#import <RSXML/RSRSSParser.h>
+#import <RSXML/RSParsedFeed.h>
+#import <RSXML/RSParsedArticle.h>
+
+#import <RSXML/RSOPMLParser.h>
+#import <RSXML/RSOPMLDocument.h>
+#import <RSXML/RSOPMLItem.h>
+#import <RSXML/RSOPMLAttributes.h>
+#import <RSXML/RSOPMLFeedSpecifier.h>
+
+#import <RSXML/RSXMLError.h>
+
+#import <RSXML/NSString+RSXML.h>
+#import <RSXML/RSDateParser.h>
+
+// HTML
+
+#import <RSXML/RSSAXHTMLParser.h>
+
+#import <RSXML/RSHTMLMetadataParser.h>
+#import <RSXML/RSHTMLMetadata.h>
+#import <RSXML/RSHTMLLinkParser.h>
+
--- a/Frameworks/RSParser/RSParser.xcodeproj/project.pbxproj
+++ b/Frameworks/RSParser/RSParser.xcodeproj/project.pbxproj
@ -0,0 +1,420 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 48;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		84D81BDC1EFA28E700652332 /* RSParser.h in Headers */ = {isa = PBXBuildFile; fileRef = 84D81BDA1EFA28E700652332 /* RSParser.h */; settings = {ATTRIBUTES = (Public, ); }; };
+		84FF5F8E1EFA285800C15A01 /* RSParser.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 84FF5F841EFA285800C15A01 /* RSParser.framework */; };
+		84FF5F931EFA285800C15A01 /* RSParserTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84FF5F921EFA285800C15A01 /* RSParserTests.swift */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXContainerItemProxy section */
+		84FF5F8F1EFA285800C15A01 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 84FF5F7B1EFA285800C15A01 /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 84FF5F831EFA285800C15A01;
+			remoteInfo = RSParser;
+		};
+/* End PBXContainerItemProxy section */
+
+/* Begin PBXFileReference section */
+		84D81BD91EFA28E700652332 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
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+		};
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+		84FF5F7E1EFA285800C15A01 /* Build configuration list for PBXProject "RSParser" */ = {
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+			buildConfigurations = (
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+		84FF5F981EFA285800C15A01 /* Build configuration list for PBXNativeTarget "RSParser" */ = {
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+			defaultConfigurationName = Release;
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+		84FF5F9B1EFA285800C15A01 /* Build configuration list for PBXNativeTarget "RSParserTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				84FF5F9C1EFA285800C15A01 /* Debug */,
+				84FF5F9D1EFA285800C15A01 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 84FF5F7B1EFA285800C15A01 /* Project object */;
+}
--- a/Frameworks/RSParser/RSParser.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ b/Frameworks/RSParser/RSParser.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:RSParser.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/Frameworks/RSParser/RSParserData.h
+++ b/Frameworks/RSParser/RSParserData.h
@ -0,0 +1,22 @@
+//
+//  RSXMLData.h
+//  RSXML
+//
+//  Created by Brent Simmons on 8/24/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RSXMLData : NSObject
+
+- (instancetype)initWithData:(NSData *)data urlString:(NSString *)urlString;
+
+@property (nonatomic, readonly) NSData *data;
+@property (nonatomic, readonly) NSString *urlString;
+
+@end
+
+NS_ASSUME_NONNULL_END
--- a/Frameworks/RSParser/RSParserData.m
+++ b/Frameworks/RSParser/RSParserData.m
@ -0,0 +1,28 @@
+//
+//  RSXMLData.m
+//  RSXML
+//
+//  Created by Brent Simmons on 8/24/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSXMLData.h"
+
+@implementation RSXMLData
+
+
+- (instancetype)initWithData:(NSData *)data urlString:(NSString *)urlString {
+	
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+	
+	_data = data;
+	_urlString = urlString;
+	
+	return self;
+}
+
+
+@end
--- a/Frameworks/RSParser/RSParserError.h
+++ b/Frameworks/RSParser/RSParserError.h
@ -0,0 +1,19 @@
+//
+//  RSXMLError.h
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+extern NSString *RSXMLErrorDomain;
+
+
+typedef NS_ENUM(NSInteger, RSXMLErrorCode) {
+	RSXMLErrorCodeDataIsWrongFormat = 1024
+};
+
+
+NSError *RSOPMLWrongFormatError(NSString *fileName);
--- a/Frameworks/RSParser/RSParserError.m
+++ b/Frameworks/RSParser/RSParserError.m
@ -0,0 +1,22 @@
+//
+//  RSXMLError.m
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSXMLError.h"
+
+NSString *RSXMLErrorDomain = @"com.ranchero.RSXML";
+
+NSError *RSOPMLWrongFormatError(NSString *fileName) {
+
+	NSString *localizedDescriptionFormatString = NSLocalizedString(@"The file ‘%@’ can’t be parsed because it’s not an OPML file.", @"OPML wrong format");
+	NSString *localizedDescription = [NSString stringWithFormat:localizedDescriptionFormatString, fileName];
+
+	NSString *localizedFailureString = NSLocalizedString(@"The file is not an OPML file.", @"OPML wrong format");
+	NSDictionary *userInfo = @{NSLocalizedDescriptionKey: localizedDescription, NSLocalizedFailureReasonErrorKey: localizedFailureString};
+
+	return [[NSError alloc] initWithDomain:RSXMLErrorDomain code:RSXMLErrorCodeDataIsWrongFormat userInfo:userInfo];
+}
--- a/Frameworks/RSParser/RSParserTests/Info.plist
+++ b/Frameworks/RSParser/RSParserTests/Info.plist
@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
--- a/Frameworks/RSParser/RSParserTests/RSParserTests.swift
+++ b/Frameworks/RSParser/RSParserTests/RSParserTests.swift
@ -0,0 +1,36 @@
+//
+//  RSParserTests.swift
+//  RSParserTests
+//
+//  Created by Brent Simmons on 6/20/17.
+//  Copyright © 2017 Ranchero Software, LLC. All rights reserved.
+//
+
+import XCTest
+@testable import RSParser
+
+class RSParserTests: XCTestCase {
+    
+    override func setUp() {
+        super.setUp()
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+    
+    override func tearDown() {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+        super.tearDown()
+    }
+    
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct results.
+    }
+    
+    func testPerformanceExample() {
+        // This is an example of a performance test case.
+        self.measure {
+            // Put the code you want to measure the time of here.
+        }
+    }
+    
+}
--- a/Frameworks/RSParser/Utilities/NSString+RSXML.h
+++ b/Frameworks/RSParser/Utilities/NSString+RSXML.h
@ -0,0 +1,16 @@
+//
+//  NSString+RSXML.h
+//  RSXML
+//
+//  Created by Brent Simmons on 9/25/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+@interface NSString (RSXML)
+
+- (NSString *)rs_stringByDecodingHTMLEntities;
+
+@end
+
--- a/Frameworks/RSParser/Utilities/NSString+RSXML.m
+++ b/Frameworks/RSParser/Utilities/NSString+RSXML.m
@ -0,0 +1,408 @@
+//
+//  NSString+RSXML.m
+//  RSXML
+//
+//  Created by Brent Simmons on 9/25/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "NSString+RSXML.h"
+
+
+@interface NSScanner (RSXML)
+
+- (BOOL)rs_scanEntityValue:(NSString * _Nullable * _Nullable)decodedEntity;
+
+@end
+
+
+@implementation NSString (RSXML)
+
+- (NSString *)rs_stringByDecodingHTMLEntities {
+	
+	@autoreleasepool {
+		
+		NSScanner *scanner = [[NSScanner alloc] initWithString:self];
+		scanner.charactersToBeSkipped = nil;
+		NSMutableString *result = [[NSMutableString alloc] init];
+		
+		while (true) {
+			
+			NSString *scannedString = nil;
+			if ([scanner scanUpToString:@"&" intoString:&scannedString]) {
+				[result appendString:scannedString];
+			}
+			if (scanner.isAtEnd) {
+				break;
+			}
+			NSUInteger savedScanLocation = scanner.scanLocation;
+			
+			NSString *decodedEntity = nil;
+			if ([scanner rs_scanEntityValue:&decodedEntity]) {
+				[result appendString:decodedEntity];
+			}
+			else {
+				[result appendString:@"&"];
+				scanner.scanLocation = savedScanLocation + 1;
+			}
+			
+			if (scanner.isAtEnd) {
+				break;
+			}
+		}
+		
+		if ([self isEqualToString:result]) {
+			return self;
+		}
+		return [result copy];
+	}
+}
+
+
+static NSDictionary *RSEntitiesDictionary(void);
+static NSString *RSXMLStringWithValue(unichar value);
+
+- (NSString * _Nullable)rs_stringByDecodingEntity {
+	
+	// self may or may not have outer & and ; characters.
+	
+	NSMutableString *s = [self mutableCopy];
+	
+	if ([s hasPrefix:@"&"]) {
+		[s deleteCharactersInRange:NSMakeRange(0, 1)];
+	}
+	if ([s hasSuffix:@";"]) {
+		[s deleteCharactersInRange:NSMakeRange(s.length - 1, 1)];
+	}
+	
+	NSDictionary *entitiesDictionary = RSEntitiesDictionary();
+	
+	NSString *decodedEntity = entitiesDictionary[self];
+	if (decodedEntity) {
+		return decodedEntity;
+	}
+	
+	if ([s hasPrefix:@"#x"]) { // Hex
+		NSScanner *scanner = [[NSScanner alloc] initWithString:s];
+		scanner.charactersToBeSkipped = [NSCharacterSet characterSetWithCharactersInString:@"#x"];
+		unsigned int hexValue = 0;
+		if ([scanner scanHexInt:&hexValue]) {
+			return RSXMLStringWithValue((unichar)hexValue);
+		}
+		return nil;
+	}
+
+	else if ([s hasPrefix:@"#"]) {
+		[s deleteCharactersInRange:NSMakeRange(0, 1)];
+		NSInteger value = s.integerValue;
+		if (value < 1) {
+			return nil;
+		}
+		return RSXMLStringWithValue((unichar)value);
+	}
+
+	return nil;
+}
+
+@end
+
+@implementation NSScanner (RSXML)
+
+- (BOOL)rs_scanEntityValue:(NSString * _Nullable * _Nullable)decodedEntity {
+	
+	NSString *s = self.string;
+	NSUInteger initialScanLocation = self.scanLocation;
+	static NSUInteger maxEntityLength = 20; // It’s probably smaller, but this is just for sanity.
+	
+	while (true) {
+		
+		unichar ch = [s characterAtIndex:self.scanLocation];
+		if ([NSCharacterSet.whitespaceAndNewlineCharacterSet characterIsMember:ch]) {
+			break;
+		}
+		if (ch == ';') {
+			if (!decodedEntity) {
+				return YES;
+			}
+			NSString *rawEntity = [s substringWithRange:NSMakeRange(initialScanLocation + 1, (self.scanLocation - initialScanLocation) - 1)];
+			*decodedEntity = [rawEntity rs_stringByDecodingEntity];
+			self.scanLocation = self.scanLocation + 1;
+			return *decodedEntity != nil;
+		}
+		
+		self.scanLocation = self.scanLocation + 1;
+		if (self.scanLocation - initialScanLocation > maxEntityLength) {
+			break;
+		}
+		if (self.isAtEnd) {
+			break;
+		}
+	}
+	
+	return NO;
+}
+
+@end
+
+static NSString *RSXMLStringWithValue(unichar value) {
+	
+	return [[NSString alloc] initWithFormat:@"%C", value];
+}
+
+static NSDictionary *RSEntitiesDictionary(void) {
+	
+	static NSDictionary *entitiesDictionary = nil;
+	
+	static dispatch_once_t onceToken;
+	dispatch_once(&onceToken, ^{
+		
+		entitiesDictionary =
+		@{@"#034": @"\"",
+		  @"#038": @"&",
+		  @"#38": @"&",
+		  @"#039": @"'",
+		  @"#145": @"‘",
+		  @"#146": @"’",
+		  @"#147": @"“",
+		  @"#148": @"”",
+		  @"#149": @"•",
+		  @"#150": @"-",
+		  @"#151": @"—",
+		  @"#153": @"™",
+		  @"#160": RSXMLStringWithValue(160),
+		  @"#161": @"¡",
+		  @"#162": @"¢",
+		  @"#163": @"£",
+		  @"#164": @"?",
+		  @"#165": @"¥",
+		  @"#166": @"?",
+		  @"#167": @"§",
+		  @"#168": @"¨",
+		  @"#169": @"©",
+		  @"#170": @"©",
+		  @"#171": @"«",
+		  @"#172": @"¬",
+		  @"#173": @"¬",
+		  @"#174": @"®",
+		  @"#175": @"¯",
+		  @"#176": @"°",
+		  @"#177": @"±",
+		  @"#178": @" ",
+		  @"#179": @" ",
+		  @"#180": @"´",
+		  @"#181": @"µ",
+		  @"#182": @"µ",
+		  @"#183": @"·",
+		  @"#184": @"¸",
+		  @"#185": @" ",
+		  @"#186": @"º",
+		  @"#187": @"»",
+		  @"#188": @"1/4",
+		  @"#189": @"1/2",
+		  @"#190": @"1/2",
+		  @"#191": @"¿",
+		  @"#192": @"À",
+		  @"#193": @"Á",
+		  @"#194": @"Â",
+		  @"#195": @"Ã",
+		  @"#196": @"Ä",
+		  @"#197": @"Å",
+		  @"#198": @"Æ",
+		  @"#199": @"Ç",
+		  @"#200": @"È",
+		  @"#201": @"É",
+		  @"#202": @"Ê",
+		  @"#203": @"Ë",
+		  @"#204": @"Ì",
+		  @"#205": @"Í",
+		  @"#206": @"Î",
+		  @"#207": @"Ï",
+		  @"#208": @"?",
+		  @"#209": @"Ñ",
+		  @"#210": @"Ò",
+		  @"#211": @"Ó",
+		  @"#212": @"Ô",
+		  @"#213": @"Õ",
+		  @"#214": @"Ö",
+		  @"#215": @"x",
+		  @"#216": @"Ø",
+		  @"#217": @"Ù",
+		  @"#218": @"Ú",
+		  @"#219": @"Û",
+		  @"#220": @"Ü",
+		  @"#221": @"Y",
+		  @"#222": @"?",
+		  @"#223": @"ß",
+		  @"#224": @"à",
+		  @"#225": @"á",
+		  @"#226": @"â",
+		  @"#227": @"ã",
+		  @"#228": @"ä",
+		  @"#229": @"å",
+		  @"#230": @"æ",
+		  @"#231": @"ç",
+		  @"#232": @"è",
+		  @"#233": @"é",
+		  @"#234": @"ê",
+		  @"#235": @"ë",
+		  @"#236": @"ì",
+		  @"#237": @"í",
+		  @"#238": @"î",
+		  @"#239": @"ï",
+		  @"#240": @"?",
+		  @"#241": @"ñ",
+		  @"#242": @"ò",
+		  @"#243": @"ó",
+		  @"#244": @"ô",
+		  @"#245": @"õ",
+		  @"#246": @"ö",
+		  @"#247": @"÷",
+		  @"#248": @"ø",
+		  @"#249": @"ù",
+		  @"#250": @"ú",
+		  @"#251": @"û",
+		  @"#252": @"ü",
+		  @"#253": @"y",
+		  @"#254": @"?",
+		  @"#255": @"ÿ",
+		  @"#32": @" ",
+		  @"#34": @"\"",
+		  @"#39": @"",
+		  @"#8194": @" ",
+		  @"#8195": @" ",
+		  @"#8211": @"-",
+		  @"#8212": @"—",
+		  @"#8216": @"‘",
+		  @"#8217": @"’",
+		  @"#8220": @"“",
+		  @"#8221": @"”",
+		  @"#8230": @"…",
+		  @"#8617": RSXMLStringWithValue(8617),
+		  @"AElig": @"Æ",
+		  @"Aacute": @"Á",
+		  @"Acirc": @"Â",
+		  @"Agrave": @"À",
+		  @"Aring": @"Å",
+		  @"Atilde": @"Ã",
+		  @"Auml": @"Ä",
+		  @"Ccedil": @"Ç",
+		  @"Dstrok": @"?",
+		  @"ETH": @"?",
+		  @"Eacute": @"É",
+		  @"Ecirc": @"Ê",
+		  @"Egrave": @"È",
+		  @"Euml": @"Ë",
+		  @"Iacute": @"Í",
+		  @"Icirc": @"Î",
+		  @"Igrave": @"Ì",
+		  @"Iuml": @"Ï",
+		  @"Ntilde": @"Ñ",
+		  @"Oacute": @"Ó",
+		  @"Ocirc": @"Ô",
+		  @"Ograve": @"Ò",
+		  @"Oslash": @"Ø",
+		  @"Otilde": @"Õ",
+		  @"Ouml": @"Ö",
+		  @"Pi": @"Π",
+		  @"THORN": @"?",
+		  @"Uacute": @"Ú",
+		  @"Ucirc": @"Û",
+		  @"Ugrave": @"Ù",
+		  @"Uuml": @"Ü",
+		  @"Yacute": @"Y",
+		  @"aacute": @"á",
+		  @"acirc": @"â",
+		  @"acute": @"´",
+		  @"aelig": @"æ",
+		  @"agrave": @"à",
+		  @"amp": @"&",
+		  @"apos": @"'",
+		  @"aring": @"å",
+		  @"atilde": @"ã",
+		  @"auml": @"ä",
+		  @"brkbar": @"?",
+		  @"brvbar": @"?",
+		  @"ccedil": @"ç",
+		  @"cedil": @"¸",
+		  @"cent": @"¢",
+		  @"copy": @"©",
+		  @"curren": @"?",
+		  @"deg": @"°",
+		  @"die": @"?",
+		  @"divide": @"÷",
+		  @"eacute": @"é",
+		  @"ecirc": @"ê",
+		  @"egrave": @"è",
+		  @"eth": @"?",
+		  @"euml": @"ë",
+		  @"euro": @"€",
+		  @"frac12": @"1/2",
+		  @"frac14": @"1/4",
+		  @"frac34": @"3/4",
+		  @"gt": @">",
+		  @"hearts": @"♥",
+		  @"hellip": @"…",
+		  @"iacute": @"í",
+		  @"icirc": @"î",
+		  @"iexcl": @"¡",
+		  @"igrave": @"ì",
+		  @"iquest": @"¿",
+		  @"iuml": @"ï",
+		  @"laquo": @"«",
+		  @"ldquo": @"“",
+		  @"lsquo": @"‘",
+		  @"lt": @"<",
+		  @"macr": @"¯",
+		  @"mdash": @"—",
+		  @"micro": @"µ",
+		  @"middot": @"·",
+		  @"ndash": @"-",
+		  @"not": @"¬",
+		  @"ntilde": @"ñ",
+		  @"oacute": @"ó",
+		  @"ocirc": @"ô",
+		  @"ograve": @"ò",
+		  @"ordf": @"ª",
+		  @"ordm": @"º",
+		  @"oslash": @"ø",
+		  @"otilde": @"õ",
+		  @"ouml": @"ö",
+		  @"para": @"¶",
+		  @"pi": @"π",
+		  @"plusmn": @"±",
+		  @"pound": @"£",
+		  @"quot": @"\"",
+		  @"raquo": @"»",
+		  @"rdquo": @"”",
+		  @"reg": @"®",
+		  @"rsquo": @"’",
+		  @"sect": @"§",
+		  @"shy": @" ",
+		  @"sup1": @" ",
+		  @"sup2": @" ",
+		  @"sup3": @" ",
+		  @"szlig": @"ß",
+		  @"thorn": @"?",
+		  @"times": @"x",
+		  @"trade": @"™",
+		  @"uacute": @"ú",
+		  @"ucirc": @"û",
+		  @"ugrave": @"ù",
+		  @"uml": @"¨",
+		  @"uuml": @"ü",
+		  @"yacute": @"y",
+		  @"yen": @"¥",
+		  @"yuml": @"ÿ",
+		  @"infin": @"∞",
+		  @"nbsp": RSXMLStringWithValue(160),
+		  @"#x21A9": RSXMLStringWithValue(8617),
+		  @"#xFE0E": RSXMLStringWithValue(65038),
+		  @"#x2019": RSXMLStringWithValue(8217),
+		  @"#x2026": RSXMLStringWithValue(8230),
+		  @"#x201C": RSXMLStringWithValue(8220),
+		  @"#x201D": RSXMLStringWithValue(8221),
+		  @"#x2014": RSXMLStringWithValue(8212)};
+	});
+	
+	return entitiesDictionary;
+}
--- a/Frameworks/RSParser/Utilities/RSDateParser.h
+++ b/Frameworks/RSParser/Utilities/RSDateParser.h
@ -0,0 +1,25 @@
+//
+//  RSDateParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 3/25/15.
+//  Copyright (c) 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+
+/*Common web dates -- RFC 822 and 8601 -- are handled here:
+ the formats you find in JSON and XML feeds.
+
+ Any of these may return nil. They may also return garbage, given bad input.*/
+
+
+NSDate *RSDateWithString(NSString *dateString);
+
+/*If you're using a SAX parser, you have the bytes and don't need to convert to a string first.
+ It's faster and uses less memory.
+ (Assumes bytes are UTF-8 or ASCII. If you're using the libxml SAX parser, this will work.)*/
+
+NSDate *RSDateWithBytes(const char *bytes, NSUInteger numberOfBytes);
+
--- a/Frameworks/RSParser/Utilities/RSDateParser.m
+++ b/Frameworks/RSParser/Utilities/RSDateParser.m
@ -0,0 +1,435 @@
+//
+//  RSDateParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 3/25/15.
+//  Copyright (c) 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+#import <time.h>
+#import "RSDateParser.h"
+
+typedef struct {
+	const char *abbreviation;
+	const NSInteger offsetHours;
+	const NSInteger offsetMinutes;
+} RSTimeZoneAbbreviationAndOffset;
+
+
+#define kNumberOfTimeZones 96
+
+static const RSTimeZoneAbbreviationAndOffset timeZoneTable[kNumberOfTimeZones] = {
+	{"GMT", 0, 0}, //Most common at top, for performance
+	{"PDT", -7, 0},		{"PST", -8, 0},		{"EST", -5, 0},		{"EDT", -4, 0},
+	{"MDT", -6, 0},		{"MST", -7, 0},		{"CST", -6, 0},		{"CDT", -5, 0},
+	{"ACT", -8, 0},		{"AFT", 4, 30},		{"AMT", 4, 0},		{"ART", -3, 0},
+	{"AST", 3, 0},		{"AZT", 4, 0},		{"BIT", -12, 0},	{"BDT", 8, 0},
+	{"ACST", 9, 30},	{"AEST", 10, 0},	{"AKST", -9, 0},	{"AMST", 5, 0},
+	{"AWST", 8, 0},		{"AZOST", -1, 0},	{"BIOT", 6, 0},		{"BRT", -3, 0},
+	{"BST", 6, 0},		{"BTT", 6, 0},		{"CAT", 2, 0},		{"CCT", 6, 30},
+	{"CET", 1, 0},		{"CEST", 2, 0},		{"CHAST", 12, 45},	{"ChST", 10, 0},
+	{"CIST", -8, 0},	{"CKT", -10, 0},	{"CLT", -4, 0},		{"CLST", -3, 0},
+	{"COT", -5, 0},		{"COST", -4, 0},	{"CVT", -1, 0},		{"CXT", 7, 0},
+	{"EAST", -6, 0},	{"EAT", 3, 0},		{"ECT", -4, 0},		{"EEST", 3, 0},
+	{"EET", 2, 0},		{"FJT", 12, 0},		{"FKST", -4, 0},	{"GALT", -6, 0},
+	{"GET", 4, 0},		{"GFT", -3, 0},		{"GILT", 7, 0},		{"GIT", -9, 0},
+	{"GST", -2, 0},		{"GYT", -4, 0},		{"HAST", -10, 0},	{"HKT", 8, 0},
+	{"HMT", 5, 0},		{"IRKT", 8, 0},		{"IRST", 3, 30},	{"IST", 2, 0},
+	{"JST", 9, 0},		{"KRAT", 7, 0},		{"KST", 9, 0},		{"LHST", 10, 30},
+	{"LINT", 14, 0},	{"MAGT", 11, 0},	{"MIT", -9, 30},	{"MSK", 3, 0},
+	{"MUT", 4, 0},		{"NDT", -2, 30},	{"NFT", 11, 30},	{"NPT", 5, 45},
+	{"NT", -3, 30},		{"OMST", 6, 0},		{"PETT", 12, 0},	{"PHOT", 13, 0},
+	{"PKT", 5, 0},		{"RET", 4, 0},		{"SAMT", 4, 0},		{"SAST", 2, 0},
+	{"SBT", 11, 0},		{"SCT", 4, 0},		{"SLT", 5, 30},		{"SST", 8, 0},
+	{"TAHT", -10, 0},	{"THA", 7, 0},		{"UYT", -3, 0},		{"UYST", -2, 0},
+	{"VET", -4, 30},	{"VLAT", 10, 0},	{"WAT", 1, 0},		{"WET", 0, 0},
+	{"WEST", 1, 0},		{"YAKT", 9, 0},		{"YEKT", 5, 0}
+}; /*See http://en.wikipedia.org/wiki/List_of_time_zone_abbreviations for list*/
+
+
+
+#pragma mark - Parser
+
+enum {
+	RSJanuary = 1,
+	RSFebruary,
+	RSMarch,
+	RSApril,
+	RSMay,
+	RSJune,
+	RSJuly,
+	RSAugust,
+	RSSeptember,
+	RSOctober,
+	RSNovember,
+	RSDecember
+};
+
+static NSInteger nextMonthValue(const char *bytes, NSUInteger numberOfBytes, NSUInteger startingIndex, NSUInteger *finalIndex) {
+
+	/*Months are 1-based -- January is 1, Dec is 12.
+	 Lots of short-circuits here. Not strict. GIGO.*/
+
+	NSUInteger i;// = startingIndex;
+	NSUInteger numberOfAlphaCharactersFound = 0;
+	char monthCharacters[3] = {0, 0, 0};
+
+	for (i = startingIndex; i < numberOfBytes; i++) {
+
+		*finalIndex = i;
+		char character = bytes[i];
+
+		BOOL isAlphaCharacter = (BOOL)isalpha(character);
+		if (!isAlphaCharacter && numberOfAlphaCharactersFound < 1)
+			continue;
+		if (!isAlphaCharacter && numberOfAlphaCharactersFound > 0)
+			break;
+
+		numberOfAlphaCharactersFound++;
+		if (numberOfAlphaCharactersFound == 1) {
+			if (character == 'F' || character == 'f')
+				return RSFebruary;
+			if (character == 'S' || character == 's')
+				return RSSeptember;
+			if (character == 'O' || character == 'o')
+				return RSOctober;
+			if (character == 'N' || character == 'n')
+				return RSNovember;
+			if (character == 'D' || character == 'd')
+				return RSDecember;
+		}
+
+		monthCharacters[numberOfAlphaCharactersFound - 1] = character;
+		if (numberOfAlphaCharactersFound >=3)
+			break;
+	}
+
+	if (numberOfAlphaCharactersFound < 2)
+		return NSNotFound;
+
+	if (monthCharacters[0] == 'J' || monthCharacters[0] == 'j') { //Jan, Jun, Jul
+		if (monthCharacters[1] == 'a' || monthCharacters[i] == 'A')
+			return RSJanuary;
+		if (monthCharacters[1] == 'u' || monthCharacters[1] == 'U') {
+			if (monthCharacters[2] == 'n' || monthCharacters[2] == 'N')
+				return RSJune;
+			return RSJuly;
+		}
+		return RSJanuary;
+	}
+
+	if (monthCharacters[0] == 'M' || monthCharacters[0] == 'm') { //March, May
+		if (monthCharacters[2] == 'y' || monthCharacters[2] == 'Y')
+			return RSMay;
+		return RSMarch;
+	}
+
+	if (monthCharacters[0] == 'A' || monthCharacters[0] == 'a') { //April, August
+		if (monthCharacters[1] == 'u' || monthCharacters[1] == 'U')
+			return RSAugust;
+		return RSApril;
+	}
+
+	return RSJanuary; //should never get here
+}
+
+
+static NSInteger nextNumericValue(const char *bytes, NSUInteger numberOfBytes, NSUInteger startingIndex, NSUInteger maximumNumberOfDigits, NSUInteger *finalIndex) {
+
+	/*maximumNumberOfDigits has a maximum limit of 4 (for time zone offsets and years).
+	 *finalIndex will be the index of the last character looked at.*/
+
+	if (maximumNumberOfDigits > 4)
+		maximumNumberOfDigits = 4;
+
+	NSUInteger i = 0;
+	NSUInteger numberOfDigitsFound = 0;
+	NSInteger digits[4] = {0, 0, 0, 0};
+
+	for (i = startingIndex; i < numberOfBytes; i++) {
+		*finalIndex = i;
+		BOOL isDigit = (BOOL)isdigit(bytes[i]);
+		if (!isDigit && numberOfDigitsFound < 1)
+			continue;
+		if (!isDigit && numberOfDigitsFound > 0)
+			break;
+		digits[numberOfDigitsFound] = bytes[i] - 48; // '0' is 48
+		numberOfDigitsFound++;
+		if (numberOfDigitsFound >= maximumNumberOfDigits)
+			break;
+	}
+
+	if (numberOfDigitsFound < 1)
+		return NSNotFound;
+	if (numberOfDigitsFound == 1)
+		return digits[0];
+	if (numberOfDigitsFound == 2)
+		return (digits[0] * 10) + digits[1];
+	if (numberOfDigitsFound == 3)
+		return (digits[0] * 100) + (digits[1] * 10) + digits[2];
+	return (digits[0] * 1000) + (digits[1] * 100) + (digits[2] * 10) + digits[3];
+}
+
+
+static BOOL hasAtLeastOneAlphaCharacter(const char *s) {
+
+	NSUInteger length = strlen(s);
+	NSUInteger i = 0;
+
+	for (i = 0; i < length; i++) {
+		if (isalpha(s[i]))
+			return YES;
+	}
+
+	return NO;
+}
+
+
+#pragma mark - Time Zones and offsets
+
+static NSInteger offsetInSecondsForTimeZoneAbbreviation(const char *abbreviation) {
+
+	/*Linear search should be fine. It's a C array, and short (under 100 items).
+	 Most common time zones are at the beginning of the array. (We can tweak this as needed.)*/
+
+	NSUInteger i;
+
+	for (i = 0; i < kNumberOfTimeZones; i++) {
+
+		RSTimeZoneAbbreviationAndOffset zone = timeZoneTable[i];
+		if (strcmp(abbreviation, zone.abbreviation) == 0) {
+			if (zone.offsetHours < 0)
+				return (zone.offsetHours * 60 * 60) - (zone.offsetMinutes * 60);
+			return (zone.offsetHours * 60 * 60) + (zone.offsetMinutes * 60);
+		}
+	}
+
+	return 0;
+}
+
+
+static NSInteger offsetInSecondsForOffsetCharacters(const char *timeZoneCharacters) {
+
+	BOOL isPlus = timeZoneCharacters[0] == '+';
+	NSUInteger finalIndex = 0;
+	NSInteger hours = nextNumericValue(timeZoneCharacters, strlen(timeZoneCharacters), 0, 2, &finalIndex);
+	NSInteger minutes = nextNumericValue(timeZoneCharacters, strlen(timeZoneCharacters), finalIndex + 1, 2, &finalIndex);
+
+	if (hours == NSNotFound)
+		hours = 0;
+	if (minutes == NSNotFound)
+		minutes = 0;
+	if (hours == 0 && minutes == 0)
+		return 0;
+
+	NSInteger seconds = (hours * 60 * 60) + (minutes * 60);
+	if (!isPlus)
+		seconds = 0 - seconds;
+	return seconds;
+}
+
+
+static const char *rs_GMT = "GMT";
+static const char *rs_UTC = "UTC";
+
+static NSInteger parsedTimeZoneOffset(const char *bytes, NSUInteger numberOfBytes, NSUInteger startingIndex) {
+
+	/*Examples: GMT Z +0000 -0000 +07:00 -0700 PDT EST
+	 Parse into char[5] -- drop any colon characters. If numeric, calculate seconds from GMT.
+	 If alpha, special-case GMT and Z, otherwise look up in time zone list to get offset.*/
+
+	char timeZoneCharacters[6] = {0, 0, 0, 0, 0, 0}; //nil-terminated last character
+	NSUInteger i = 0;
+	NSUInteger numberOfCharactersFound = 0;
+
+	for (i = startingIndex; i < numberOfBytes; i++) {
+		char ch = bytes[i];
+		if (ch == ':' || ch == ' ')
+			continue;
+		if (isdigit(ch) || isalpha(ch) || ch == '+' || ch == '-') {
+			numberOfCharactersFound++;
+			timeZoneCharacters[numberOfCharactersFound - 1] = ch;
+		}
+		if (numberOfCharactersFound >= 5)
+			break;
+	}
+
+	if (numberOfCharactersFound < 1 || timeZoneCharacters[0] == 'Z' || timeZoneCharacters[0] == 'z')
+		return 0;
+	if (strcasestr(timeZoneCharacters, rs_GMT) != nil || strcasestr(timeZoneCharacters, rs_UTC))
+		return 0;
+
+	if (hasAtLeastOneAlphaCharacter(timeZoneCharacters))
+		return offsetInSecondsForTimeZoneAbbreviation(timeZoneCharacters);
+	return offsetInSecondsForOffsetCharacters(timeZoneCharacters);
+}
+
+
+#pragma mark - Date Creation
+
+static NSDate *dateWithYearMonthDayHourMinuteSecondAndTimeZoneOffset(NSInteger year, NSInteger month, NSInteger day, NSInteger hour, NSInteger minute, NSInteger second, NSInteger milliseconds, NSInteger timeZoneOffset) {
+
+	struct tm timeInfo;
+	timeInfo.tm_sec = (int)second;
+	timeInfo.tm_min = (int)minute;
+	timeInfo.tm_hour = (int)hour;
+	timeInfo.tm_mday = (int)day;
+	timeInfo.tm_mon = (int)(month - 1); //It's 1-based coming in
+	timeInfo.tm_year = (int)(year - 1900); //see time.h -- it's years since 1900
+	timeInfo.tm_wday = -1;
+	timeInfo.tm_yday = -1;
+	timeInfo.tm_isdst = -1;
+	timeInfo.tm_gmtoff = 0;//[timeZone secondsFromGMT];
+	timeInfo.tm_zone = nil;
+
+	NSTimeInterval rawTime = (NSTimeInterval)(timegm(&timeInfo) - timeZoneOffset); //timegm instead of mktime (which uses local time zone)
+	if (rawTime == (time_t)ULONG_MAX) {
+
+		/*NSCalendar is super-amazingly-slow (which is partly why RSDateParser exists), so this is used only when the date is far enough in the future (19 January 2038 03:14:08Z on 32-bit systems) that timegm fails. If profiling says that this is a performance issue, then you've got a weird app that needs to work with dates far in the future.*/
+
+		NSDateComponents *dateComponents = [NSDateComponents new];
+
+		dateComponents.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:timeZoneOffset];
+		dateComponents.year = year;
+		dateComponents.month = month;
+		dateComponents.day = day;
+		dateComponents.hour = hour;
+		dateComponents.minute = minute;
+		dateComponents.second = second + (milliseconds / 1000);
+
+		return [[NSCalendar autoupdatingCurrentCalendar] dateFromComponents:dateComponents];
+	}
+
+	if (milliseconds > 0) {
+		rawTime += ((float)milliseconds / 1000.0f);
+	}
+
+	return [NSDate dateWithTimeIntervalSince1970:rawTime];
+}
+
+
+#pragma mark - Standard Formats
+
+static NSDate *RSParsePubDateWithBytes(const char *bytes, NSUInteger numberOfBytes) {
+
+	/*@"EEE',' dd MMM yyyy HH':'mm':'ss ZZZ"
+	 @"EEE, dd MMM yyyy HH:mm:ss zzz"
+	 @"dd MMM yyyy HH:mm zzz"
+	 @"dd MMM yyyy HH:mm ZZZ"
+	 @"EEE, dd MMM yyyy"
+	 @"EEE, dd MMM yyyy HH:mm zzz"
+	 etc.*/
+
+	NSUInteger finalIndex = 0;
+	NSInteger day = 1;
+	NSInteger month = RSJanuary;
+	NSInteger year = 1970;
+	NSInteger hour = 0;
+	NSInteger minute = 0;
+	NSInteger second = 0;
+	NSInteger timeZoneOffset = 0;
+
+	day = nextNumericValue(bytes, numberOfBytes, 0, 2, &finalIndex);
+	if (day < 1 || day == NSNotFound)
+		day = 1;
+
+	month = nextMonthValue(bytes, numberOfBytes, finalIndex + 1, &finalIndex);
+	year = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 4, &finalIndex);
+	hour = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 2, &finalIndex);
+	if (hour == NSNotFound)
+		hour = 0;
+
+	minute = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 2, &finalIndex);
+	if (minute == NSNotFound)
+		minute = 0;
+
+	NSUInteger currentIndex = finalIndex + 1;
+
+	BOOL hasSeconds = (currentIndex < numberOfBytes) && (bytes[currentIndex] == ':');
+	if (hasSeconds)
+		second = nextNumericValue(bytes, numberOfBytes, currentIndex, 2, &finalIndex);
+
+	currentIndex = finalIndex + 1;
+	BOOL hasTimeZone = (currentIndex < numberOfBytes) && (bytes[currentIndex] == ' ');
+	if (hasTimeZone)
+		timeZoneOffset = parsedTimeZoneOffset(bytes, numberOfBytes, currentIndex);
+
+	return dateWithYearMonthDayHourMinuteSecondAndTimeZoneOffset(year, month, day, hour, minute, second, 0, timeZoneOffset);
+}
+
+
+static NSDate *RSParseW3CWithBytes(const char *bytes, NSUInteger numberOfBytes) {
+
+	/*@"yyyy'-'MM'-'dd'T'HH':'mm':'ss"
+	 @"yyyy-MM-dd'T'HH:mm:sszzz"
+	 @"yyyy-MM-dd'T'HH:mm:ss'.'SSSzzz"
+	 etc.*/
+
+	NSUInteger finalIndex = 0;
+	NSInteger day = 1;
+	NSInteger month = RSJanuary;
+	NSInteger year = 1970;
+	NSInteger hour = 0;
+	NSInteger minute = 0;
+	NSInteger second = 0;
+	NSInteger milliseconds = 0;
+	NSInteger timeZoneOffset = 0;
+
+	year = nextNumericValue(bytes, numberOfBytes, 0, 4, &finalIndex);
+	month = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 2, &finalIndex);
+	day = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 2, &finalIndex);
+	hour = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 2, &finalIndex);
+	minute = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 2, &finalIndex);
+	second = nextNumericValue(bytes, numberOfBytes, finalIndex + 1, 2, &finalIndex);
+
+	NSUInteger currentIndex = finalIndex + 1;
+	BOOL hasMilliseconds = (currentIndex < numberOfBytes) && (bytes[currentIndex] == '.');
+	if (hasMilliseconds) {
+		milliseconds = nextNumericValue(bytes, numberOfBytes, currentIndex, 3, &finalIndex);
+		currentIndex = finalIndex + 1;
+	}
+
+	timeZoneOffset = parsedTimeZoneOffset(bytes, numberOfBytes, currentIndex);
+
+	return dateWithYearMonthDayHourMinuteSecondAndTimeZoneOffset(year, month, day, hour, minute, second, milliseconds, timeZoneOffset);
+}
+
+
+static BOOL dateIsPubDate(const char *bytes, NSUInteger numberOfBytes) {
+
+	NSUInteger i = 0;
+
+	for (i = 0; i < numberOfBytes; i++) {
+		if (bytes[i] == ' ' || bytes[i] == ',')
+			return YES;
+	}
+
+	return NO;
+}
+
+
+static BOOL numberOfBytesIsOutsideReasonableRange(NSUInteger numberOfBytes) {
+	return numberOfBytes < 6 || numberOfBytes > 50;
+}
+
+
+#pragma mark - API
+
+NSDate *RSDateWithBytes(const char *bytes, NSUInteger numberOfBytes) {
+
+	if (numberOfBytesIsOutsideReasonableRange(numberOfBytes))
+		return nil;
+
+	if (dateIsPubDate(bytes, numberOfBytes))
+		return RSParsePubDateWithBytes(bytes, numberOfBytes);
+
+	return RSParseW3CWithBytes(bytes, numberOfBytes);
+}
+
+
+NSDate *RSDateWithString(NSString *dateString) {
+
+	const char *utf8String = [dateString UTF8String];
+	return RSDateWithBytes(utf8String, strlen(utf8String));
+}
+
--- a/Frameworks/RSParser/Utilities/RSXMLInternal.h
+++ b/Frameworks/RSParser/Utilities/RSXMLInternal.h
@ -0,0 +1,31 @@
+//
+//  RSXMLInternal.h
+//  RSXML
+//
+//  Created by Brent Simmons on 12/26/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+NS_ASSUME_NONNULL_BEGIN
+
+BOOL RSXMLIsEmpty(id _Nullable obj);
+BOOL RSXMLStringIsEmpty(NSString * _Nullable s);
+
+
+@interface NSString (RSXMLInternal)
+
+- (NSString *)rsxml_md5HashString;
+
+@end
+
+
+@interface NSDictionary (RSXMLInternal)
+
+- (nullable id)rsxml_objectForCaseInsensitiveKey:(NSString *)key;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
--- a/Frameworks/RSParser/Utilities/RSXMLInternal.m
+++ b/Frameworks/RSParser/Utilities/RSXMLInternal.m
@ -0,0 +1,83 @@
+//
+//  RSXMLInternal.m
+//  RSXML
+//
+//  Created by Brent Simmons on 12/26/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import <CommonCrypto/CommonDigest.h>
+#import "RSXMLInternal.h"
+
+
+static BOOL RSXMLIsNil(id obj) {
+	
+	return obj == nil || obj == [NSNull null];
+}
+
+BOOL RSXMLIsEmpty(id obj) {
+	
+	if (RSXMLIsNil(obj)) {
+		return YES;
+	}
+	
+	if ([obj respondsToSelector:@selector(count)]) {
+		return [obj count] < 1;
+	}
+	
+	if ([obj respondsToSelector:@selector(length)]) {
+		return [obj length] < 1;
+	}
+	
+	return NO; /*Shouldn't get here very often.*/
+}
+
+BOOL RSXMLStringIsEmpty(NSString *s) {
+	
+	return RSXMLIsNil(s) || s.length < 1;
+}
+
+
+@implementation NSString (RSXMLInternal)
+
+- (NSData *)rsxml_md5Hash {
+	
+	NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
+	unsigned char hash[CC_MD5_DIGEST_LENGTH];
+	CC_MD5(data.bytes, (CC_LONG)data.length, hash);
+	
+	return [NSData dataWithBytes:(const void *)hash length:CC_MD5_DIGEST_LENGTH];
+}
+
+- (NSString *)rsxml_md5HashString {
+	
+	NSData *md5Data = [self rsxml_md5Hash];
+	const Byte *bytes = md5Data.bytes;
+	return [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7], bytes[8], bytes[9], bytes[10], bytes[11], bytes[12], bytes[13], bytes[14], bytes[15]];
+}
+
+@end
+
+
+@implementation NSDictionary (RSXMLInternal)
+
+
+- (nullable id)rsxml_objectForCaseInsensitiveKey:(NSString *)key {
+	
+	id obj = self[key];
+	if (obj) {
+		return obj;
+	}
+	
+	for (NSString *oneKey in self.allKeys) {
+		
+		if ([oneKey isKindOfClass:[NSString class]] && [key caseInsensitiveCompare:oneKey] == NSOrderedSame) {
+			return self[oneKey];
+		}
+	}
+	
+	return nil;
+}
+
+
+@end
--- a/Frameworks/RSParser/XML/Feeds/RSAtomParser.h
+++ b/Frameworks/RSParser/XML/Feeds/RSAtomParser.h
@ -0,0 +1,13 @@
+//
+//  RSAtomParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 1/15/15.
+//  Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
+//
+
+#import "FeedParser.h"
+
+@interface RSAtomParser : NSObject <FeedParser>
+
+@end
--- a/Frameworks/RSParser/XML/Feeds/RSAtomParser.m
+++ b/Frameworks/RSParser/XML/Feeds/RSAtomParser.m
@ -0,0 +1,604 @@
+//
+//  RSAtomParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 1/15/15.
+//  Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
+//
+
+#import <libxml/xmlstring.h>
+#import "RSAtomParser.h"
+#import "RSSAXParser.h"
+#import "FeedParser.h"
+#import "RSParsedFeed.h"
+#import "RSParsedArticle.h"
+#import "RSXMLData.h"
+#import "NSString+RSXML.h"
+#import "RSDateParser.h"
+
+
+@interface RSAtomParser () <RSSAXParserDelegate>
+
+@property (nonatomic) NSData *feedData;
+@property (nonatomic) NSString *urlString;
+@property (nonatomic) BOOL endFeedFound;
+@property (nonatomic) BOOL parsingXHTML;
+@property (nonatomic) BOOL parsingSource;
+@property (nonatomic) BOOL parsingArticle;
+@property (nonatomic) BOOL parsingAuthor;
+@property (nonatomic) NSMutableArray *attributesStack;
+@property (nonatomic, readonly) NSDictionary *currentAttributes;
+@property (nonatomic) NSMutableString *xhtmlString;
+@property (nonatomic) NSString *link;
+@property (nonatomic) NSString *title;
+@property (nonatomic) NSMutableArray *articles;
+@property (nonatomic) NSDate *dateParsed;
+@property (nonatomic) RSSAXParser *parser;
+@property (nonatomic, readonly) RSParsedArticle *currentArticle;
+@property (nonatomic, readonly) NSDate *currentDate;
+
+@end
+
+
+@implementation RSAtomParser
+
+#pragma mark - Class Methods
+
+ (BOOL)canParseFeed:(RSXMLData *)xmlData {
+
+	// Checking for '<feed' and '<entry' within first n characters should do it.
+
+	@autoreleasepool {
+
+		NSData *feedData = xmlData.data;
+		
+		NSString *s = [[NSString alloc] initWithBytesNoCopy:(void *)feedData.bytes length:feedData.length encoding:NSUTF8StringEncoding freeWhenDone:NO];
+		if (!s) {
+			s = [[NSString alloc] initWithData:feedData encoding:NSUTF8StringEncoding];
+		}
+		if (!s) {
+			s = [[NSString alloc] initWithData:feedData encoding:NSUnicodeStringEncoding];
+		}
+		if (!s) {
+			return NO;
+		}
+
+		static const NSInteger numberOfCharactersToSearch = 4096;
+		NSRange rangeToSearch = NSMakeRange(0, numberOfCharactersToSearch);
+		if (s.length < numberOfCharactersToSearch) {
+			rangeToSearch.length = s.length;
+		}
+
+		NSRange feedRange = [s rangeOfString:@"<feed" options:NSLiteralSearch range:rangeToSearch];
+		NSRange entryRange = [s rangeOfString:@"<entry" options:NSLiteralSearch range:rangeToSearch];
+		if (feedRange.length < 1 || entryRange.length < 1) {
+			return NO;
+		}
+
+		if (feedRange.location > entryRange.location) {
+			return NO; // Wrong order.
+		}
+	}
+	
+	return YES;
+}
+
+
+#pragma mark - Init
+
+- (instancetype)initWithXMLData:(RSXMLData *)xmlData {
+	
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+	
+	_feedData = xmlData.data;
+	_urlString = xmlData.urlString;
+	_parser = [[RSSAXParser alloc] initWithDelegate:self];
+	_attributesStack = [NSMutableArray new];
+	_articles = [NSMutableArray new];
+
+	return self;
+}
+
+
+#pragma mark - API
+
+- (RSParsedFeed *)parseFeed:(NSError **)error {
+
+	[self parse];
+
+	RSParsedFeed *parsedFeed = [[RSParsedFeed alloc] initWithURLString:self.urlString title:self.title link:self.link articles:self.articles];
+
+	return parsedFeed;
+}
+
+
+#pragma mark - Constants
+
+static NSString *kTypeKey = @"type";
+static NSString *kXHTMLType = @"xhtml";
+static NSString *kRelKey = @"rel";
+static NSString *kAlternateValue = @"alternate";
+static NSString *kHrefKey = @"href";
+static NSString *kXMLKey = @"xml";
+static NSString *kBaseKey = @"base";
+static NSString *kLangKey = @"lang";
+static NSString *kXMLBaseKey = @"xml:base";
+static NSString *kXMLLangKey = @"xml:lang";
+static NSString *kTextHTMLValue = @"text/html";
+static NSString *kRelatedValue = @"related";
+static NSString *kShortURLValue = @"shorturl";
+static NSString *kHTMLValue = @"html";
+static NSString *kEnValue = @"en";
+static NSString *kTextValue = @"text";
+static NSString *kSelfValue = @"self";
+
+static const char *kID = "id";
+static const NSInteger kIDLength = 3;
+
+static const char *kTitle = "title";
+static const NSInteger kTitleLength = 6;
+
+static const char *kContent = "content";
+static const NSInteger kContentLength = 8;
+
+static const char *kSummary = "summary";
+static const NSInteger kSummaryLength = 8;
+
+static const char *kLink = "link";
+static const NSInteger kLinkLength = 5;
+
+static const char *kPublished = "published";
+static const NSInteger kPublishedLength = 10;
+
+static const char *kUpdated = "updated";
+static const NSInteger kUpdatedLength = 8;
+
+static const char *kAuthor = "author";
+static const NSInteger kAuthorLength = 7;
+
+static const char *kEntry = "entry";
+static const NSInteger kEntryLength = 6;
+
+static const char *kSource = "source";
+static const NSInteger kSourceLength = 7;
+
+static const char *kFeed = "feed";
+static const NSInteger kFeedLength = 5;
+
+static const char *kType = "type";
+static const NSInteger kTypeLength = 5;
+
+static const char *kRel = "rel";
+static const NSInteger kRelLength = 4;
+
+static const char *kAlternate = "alternate";
+static const NSInteger kAlternateLength = 10;
+
+static const char *kHref = "href";
+static const NSInteger kHrefLength = 5;
+
+static const char *kXML = "xml";
+static const NSInteger kXMLLength = 4;
+
+static const char *kBase = "base";
+static const NSInteger kBaseLength = 5;
+
+static const char *kLang = "lang";
+static const NSInteger kLangLength = 5;
+
+static const char *kTextHTML = "text/html";
+static const NSInteger kTextHTMLLength = 10;
+
+static const char *kRelated = "related";
+static const NSInteger kRelatedLength = 8;
+
+static const char *kShortURL = "shorturl";
+static const NSInteger kShortURLLength = 9;
+
+static const char *kHTML = "html";
+static const NSInteger kHTMLLength = 5;
+
+static const char *kEn = "en";
+static const NSInteger kEnLength = 3;
+
+static const char *kText = "text";
+static const NSInteger kTextLength = 5;
+
+static const char *kSelf = "self";
+static const NSInteger kSelfLength = 5;
+
+
+#pragma mark - Parsing
+
+- (void)parse {
+
+	self.dateParsed = [NSDate date];
+
+	@autoreleasepool {
+		[self.parser parseData:self.feedData];
+		[self.parser finishParsing];
+	}
+
+	// Optimization: make articles do calculations on this background thread.
+	[self.articles makeObjectsPerformSelector:@selector(calculateArticleID)];
+}
+
+
+- (void)addArticle {
+
+	RSParsedArticle *article = [[RSParsedArticle alloc] initWithFeedURL:self.urlString];
+	article.dateParsed = self.dateParsed;
+
+	[self.articles addObject:article];
+}
+
+
+- (RSParsedArticle *)currentArticle {
+
+	return self.articles.lastObject;
+}
+
+
+- (NSDictionary *)currentAttributes {
+
+	return self.attributesStack.lastObject;
+}
+
+
+- (NSDate *)currentDate {
+
+	return RSDateWithBytes(self.parser.currentCharacters.bytes, self.parser.currentCharacters.length);
+}
+
+
+- (void)addFeedLink {
+
+	if (self.link && self.link.length > 0) {
+		return;
+	}
+
+	NSString *related = self.currentAttributes[kRelKey];
+	if (related == kAlternateValue) {
+		self.link = self.currentAttributes[kHrefKey];
+	}
+}
+
+
+- (void)addFeedTitle {
+
+	if (self.title.length < 1) {
+		self.title = self.parser.currentStringWithTrimmedWhitespace;
+	}
+}
+
+- (void)addLink {
+
+	NSString *urlString = self.currentAttributes[kHrefKey];
+	if (urlString.length < 1) {
+		return;
+	}
+
+	NSString *rel = self.currentAttributes[kRelKey];
+	if (rel.length < 1) {
+		rel = kAlternateValue;
+	}
+
+	if (rel == kAlternateValue) {
+		if (!self.currentArticle.link) {
+			self.currentArticle.link = urlString;
+		}
+	}
+	else if (rel == kRelatedValue) {
+		if (!self.currentArticle.permalink) {
+			self.currentArticle.permalink = urlString;
+		}
+	}
+}
+
+
+- (void)addContent {
+
+	self.currentArticle.body = [self currentStringWithHTMLEntitiesDecoded];
+}
+
+
+- (void)addSummary {
+
+	if (!self.currentArticle.body) {
+		self.currentArticle.body = [self currentStringWithHTMLEntitiesDecoded];
+	}
+}
+
+
+- (NSString *)currentStringWithHTMLEntitiesDecoded {
+	
+	return [self.parser.currentStringWithTrimmedWhitespace rs_stringByDecodingHTMLEntities];
+}
+
+
+- (void)addArticleElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix {
+
+	if (prefix) {
+		return;
+	}
+
+	if (RSSAXEqualTags(localName, kID, kIDLength)) {
+		self.currentArticle.guid = self.parser.currentStringWithTrimmedWhitespace;
+	}
+
+	else if (RSSAXEqualTags(localName, kTitle, kTitleLength)) {
+		self.currentArticle.title = [self currentStringWithHTMLEntitiesDecoded];
+	}
+
+	else if (RSSAXEqualTags(localName, kContent, kContentLength)) {
+		[self addContent];
+	}
+
+	else if (RSSAXEqualTags(localName, kSummary, kSummaryLength)) {
+		[self addSummary];
+	}
+
+	else if (RSSAXEqualTags(localName, kLink, kLinkLength)) {
+		[self addLink];
+	}
+
+	else if (RSSAXEqualTags(localName, kPublished, kPublishedLength)) {
+		self.currentArticle.datePublished = self.currentDate;
+	}
+
+	else if (RSSAXEqualTags(localName, kUpdated, kUpdatedLength)) {
+		self.currentArticle.dateModified = self.currentDate;
+	}
+}
+
+
+- (void)addXHTMLTag:(const xmlChar *)localName {
+
+	if (!localName) {
+		return;
+	}
+
+	[self.xhtmlString appendString:@"<"];
+	[self.xhtmlString appendString:[NSString stringWithUTF8String:(const char *)localName]];
+
+	if (self.currentAttributes.count < 1) {
+		[self.xhtmlString appendString:@">"];
+		return;
+	}
+
+	for (NSString *oneKey in self.currentAttributes) {
+
+		[self.xhtmlString appendString:@" "];
+
+		NSString *oneValue = self.currentAttributes[oneKey];
+		[self.xhtmlString appendString:oneKey];
+
+		[self.xhtmlString appendString:@"=\""];
+
+		oneValue = [oneValue stringByReplacingOccurrencesOfString:@"\"" withString:@"&quot;"];
+		[self.xhtmlString appendString:oneValue];
+
+		[self.xhtmlString appendString:@"\""];
+	}
+
+	[self.xhtmlString appendString:@">"];
+}
+
+
+#pragma mark - RSSAXParserDelegate
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLStartElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri numberOfNamespaces:(NSInteger)numberOfNamespaces namespaces:(const xmlChar **)namespaces numberOfAttributes:(NSInteger)numberOfAttributes numberDefaulted:(int)numberDefaulted attributes:(const xmlChar **)attributes {
+
+	if (self.endFeedFound) {
+		return;
+	}
+
+	NSDictionary *xmlAttributes = [self.parser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
+	if (!xmlAttributes) {
+		xmlAttributes = [NSDictionary dictionary];
+	}
+	[self.attributesStack addObject:xmlAttributes];
+
+	if (self.parsingXHTML) {
+		[self addXHTMLTag:localName];
+		return;
+	}
+
+	if (RSSAXEqualTags(localName, kEntry, kEntryLength)) {
+		self.parsingArticle = YES;
+		[self addArticle];
+		return;
+	}
+
+	if (RSSAXEqualTags(localName, kAuthor, kAuthorLength)) {
+		self.parsingAuthor = YES;
+		return;
+	}
+
+	if (RSSAXEqualTags(localName, kSource, kSourceLength)) {
+		self.parsingSource = YES;
+		return;
+	}
+
+	BOOL isContentTag = RSSAXEqualTags(localName, kContent, kContentLength);
+	BOOL isSummaryTag = RSSAXEqualTags(localName, kSummary, kSummaryLength);
+	if (self.parsingArticle && (isContentTag || isSummaryTag)) {
+
+		NSString *contentType = xmlAttributes[kTypeKey];
+		if ([contentType isEqualToString:kXHTMLType]) {
+			self.parsingXHTML = YES;
+			self.xhtmlString = [NSMutableString stringWithString:@""];
+			return;
+		}
+	}
+
+	if (!self.parsingArticle && RSSAXEqualTags(localName, kLink, kLinkLength)) {
+		[self addFeedLink];
+		return;
+	}
+
+	[self.parser beginStoringCharacters];
+}
+
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri {
+
+	if (RSSAXEqualTags(localName, kFeed, kFeedLength)) {
+		self.endFeedFound = YES;
+		return;
+	}
+
+	if (self.endFeedFound) {
+		return;
+	}
+
+	if (self.parsingXHTML) {
+
+		BOOL isContentTag = RSSAXEqualTags(localName, kContent, kContentLength);
+		BOOL isSummaryTag = RSSAXEqualTags(localName, kSummary, kSummaryLength);
+
+		if (self.parsingArticle && (isContentTag || isSummaryTag)) {
+
+			if (isContentTag) {
+				self.currentArticle.body = [self.xhtmlString copy];
+			}
+
+			else if (isSummaryTag) {
+				if (self.currentArticle.body.length < 1) {
+					self.currentArticle.body = [self.xhtmlString copy];
+				}
+			}
+		}
+
+		if (isContentTag || isSummaryTag) {
+			self.parsingXHTML = NO;
+		}
+
+		[self.xhtmlString appendString:@"</"];
+		[self.xhtmlString appendString:[NSString stringWithUTF8String:(const char *)localName]];
+		[self.xhtmlString appendString:@">"];
+	}
+
+	else if (RSSAXEqualTags(localName, kAuthor, kAuthorLength)) {
+		self.parsingAuthor = NO;
+	}
+
+	else if (RSSAXEqualTags(localName, kEntry, kEntryLength)) {
+		self.parsingArticle = NO;
+	}
+
+	else if (self.parsingArticle && !self.parsingSource) {
+		[self addArticleElement:localName prefix:prefix];
+	}
+	
+	else if (RSSAXEqualTags(localName, kSource, kSourceLength)) {
+		self.parsingSource = NO;
+	}
+
+	else if (!self.parsingArticle && !self.parsingSource && RSSAXEqualTags(localName, kTitle, kTitleLength)) {
+		[self addFeedTitle];
+	}
+	[self.attributesStack removeLastObject];
+}
+
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForName:(const xmlChar *)name prefix:(const xmlChar *)prefix {
+
+	if (prefix && RSSAXEqualTags(prefix, kXML, kXMLLength)) {
+
+		if (RSSAXEqualTags(name, kBase, kBaseLength)) {
+			return kXMLBaseKey;
+		}
+		if (RSSAXEqualTags(name, kLang, kLangLength)) {
+			return kXMLLangKey;
+		}
+	}
+
+	if (prefix) {
+		return nil;
+	}
+
+	if (RSSAXEqualTags(name, kRel, kRelLength)) {
+		return kRelKey;
+	}
+
+	if (RSSAXEqualTags(name, kType, kTypeLength)) {
+		return kTypeKey;
+	}
+
+	if (RSSAXEqualTags(name, kHref, kHrefLength)) {
+		return kHrefKey;
+	}
+
+	if (RSSAXEqualTags(name, kAlternate, kAlternateLength)) {
+		return kAlternateValue;
+	}
+
+	return nil;
+}
+
+
+static BOOL equalBytes(const void *bytes1, const void *bytes2, NSUInteger length) {
+
+	return memcmp(bytes1, bytes2, length) == 0;
+}
+
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForValue:(const void *)bytes length:(NSUInteger)length {
+
+	static const NSUInteger alternateLength = kAlternateLength - 1;
+	static const NSUInteger textHTMLLength = kTextHTMLLength - 1;
+	static const NSUInteger relatedLength = kRelatedLength - 1;
+	static const NSUInteger shortURLLength = kShortURLLength - 1;
+	static const NSUInteger htmlLength = kHTMLLength - 1;
+	static const NSUInteger enLength = kEnLength - 1;
+	static const NSUInteger textLength = kTextLength - 1;
+	static const NSUInteger selfLength = kSelfLength - 1;
+
+	if (length == alternateLength && equalBytes(bytes, kAlternate, alternateLength)) {
+		return kAlternateValue;
+	}
+
+	if (length == textHTMLLength && equalBytes(bytes, kTextHTML, textHTMLLength)) {
+		return kTextHTMLValue;
+	}
+
+	if (length == relatedLength && equalBytes(bytes, kRelated, relatedLength)) {
+		return kRelatedValue;
+	}
+
+	if (length == shortURLLength && equalBytes(bytes, kShortURL, shortURLLength)) {
+		return kShortURLValue;
+	}
+
+	if (length == htmlLength && equalBytes(bytes, kHTML, htmlLength)) {
+		return kHTMLValue;
+	}
+
+	if (length == enLength && equalBytes(bytes, kEn, enLength)) {
+		return kEnValue;
+	}
+
+	if (length == textLength && equalBytes(bytes, kText, textLength)) {
+		return kTextValue;
+	}
+
+	if (length == selfLength && equalBytes(bytes, kSelf, selfLength)) {
+		return kSelfValue;
+	}
+
+	return nil;
+}
+
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLCharactersFound:(const unsigned char *)characters length:(NSUInteger)length {
+
+	if (self.parsingXHTML) {
+		[self.xhtmlString appendString:[[NSString alloc] initWithBytesNoCopy:(void *)characters length:length encoding:NSUTF8StringEncoding freeWhenDone:NO]];
+	}
+}
+
+@end
--- a/Frameworks/RSParser/XML/Feeds/RSRSSParser.h
+++ b/Frameworks/RSParser/XML/Feeds/RSRSSParser.h
@ -0,0 +1,13 @@
+//
+//  RSRSSParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 1/6/15.
+//  Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
+//
+
+#import "FeedParser.h"
+
+@interface RSRSSParser : NSObject <FeedParser>
+
+@end
--- a/Frameworks/RSParser/XML/Feeds/RSRSSParser.m
+++ b/Frameworks/RSParser/XML/Feeds/RSRSSParser.m
@ -0,0 +1,469 @@
+//
+//  RSRSSParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 1/6/15.
+//  Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
+//
+
+#import <libxml/xmlstring.h>
+#import "RSRSSParser.h"
+#import "RSSAXParser.h"
+#import "RSParsedFeed.h"
+#import "RSParsedArticle.h"
+#import "RSXMLData.h"
+#import "RSXMLInternal.h"
+#import "NSString+RSXML.h"
+#import "RSDateParser.h"
+
+
+@interface RSRSSParser () <RSSAXParserDelegate>
+
+@property (nonatomic) NSData *feedData;
+@property (nonatomic) NSString *urlString;
+@property (nonatomic) NSDictionary *currentAttributes;
+@property (nonatomic) RSSAXParser *parser;
+@property (nonatomic) NSMutableArray *articles;
+@property (nonatomic) BOOL parsingArticle;
+@property (nonatomic, readonly) RSParsedArticle *currentArticle;
+@property (nonatomic) BOOL parsingChannelImage;
+@property (nonatomic, readonly) NSDate *currentDate;
+@property (nonatomic) BOOL endRSSFound;
+@property (nonatomic) NSString *link;
+@property (nonatomic) NSString *title;
+@property (nonatomic) NSDate *dateParsed;
+
+@end
+
+
+@implementation RSRSSParser
+
+#pragma mark - Class Methods
+
+ (BOOL)canParseFeed:(RSXMLData *)xmlData {
+
+	// Checking for '<rss' and '<channel>' within first n characters should do it.
+	// TODO: handle RSS 1.0
+
+	@autoreleasepool {
+
+		NSData *feedData = xmlData.data;
+		NSString *s = [[NSString alloc] initWithBytesNoCopy:(void *)feedData.bytes length:feedData.length encoding:NSUTF8StringEncoding freeWhenDone:NO];
+		if (!s) {
+			s = [[NSString alloc] initWithData:feedData encoding:NSUTF8StringEncoding];
+		}
+		if (!s) {
+			s = [[NSString alloc] initWithData:feedData encoding:NSUnicodeStringEncoding];
+		}
+		if (!s) {
+			return NO;
+		}
+
+		static const NSInteger numberOfCharactersToSearch = 4096;
+		NSRange rangeToSearch = NSMakeRange(0, numberOfCharactersToSearch);
+		if (s.length < numberOfCharactersToSearch) {
+			rangeToSearch.length = s.length;
+		}
+
+		NSRange rssRange = [s rangeOfString:@"<rss" options:NSLiteralSearch range:rangeToSearch];
+		NSRange channelRange = [s rangeOfString:@"<channel>" options:NSLiteralSearch range:rangeToSearch];
+		if (rssRange.length < 1 || channelRange.length < 1) {
+			return NO;
+		}
+
+		if (rssRange.location > channelRange.location) {
+			return NO; // Wrong order.
+		}
+	}
+	
+	return YES;
+}
+
+
+#pragma mark - Init
+
+- (instancetype)initWithXMLData:(RSXMLData *)xmlData {
+	
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+	
+	_feedData = xmlData.data;
+	_urlString = xmlData.urlString;
+	_parser = [[RSSAXParser alloc] initWithDelegate:self];
+	_articles = [NSMutableArray new];
+
+	return self;
+}
+
+
+#pragma mark - API
+
+- (RSParsedFeed *)parseFeed:(NSError **)error {
+	
+	[self parse];
+
+	RSParsedFeed *parsedFeed = [[RSParsedFeed alloc] initWithURLString:self.urlString title:self.title link:self.link articles:self.articles];
+
+	return parsedFeed;
+}
+
+
+#pragma mark - Constants
+
+static NSString *kIsPermaLinkKey = @"isPermaLink";
+static NSString *kURLKey = @"url";
+static NSString *kLengthKey = @"length";
+static NSString *kTypeKey = @"type";
+static NSString *kFalseValue = @"false";
+static NSString *kTrueValue = @"true";
+static NSString *kContentEncodedKey = @"content:encoded";
+static NSString *kDCDateKey = @"dc:date";
+static NSString *kDCCreatorKey = @"dc:creator";
+static NSString *kRDFAboutKey = @"rdf:about";
+
+static const char *kItem = "item";
+static const NSInteger kItemLength = 5;
+
+static const char *kImage = "image";
+static const NSInteger kImageLength = 6;
+
+static const char *kLink = "link";
+static const NSInteger kLinkLength = 5;
+
+static const char *kTitle = "title";
+static const NSInteger kTitleLength = 6;
+
+static const char *kDC = "dc";
+static const NSInteger kDCLength = 3;
+
+static const char *kCreator = "creator";
+static const NSInteger kCreatorLength = 8;
+
+static const char *kDate = "date";
+static const NSInteger kDateLength = 5;
+
+static const char *kContent = "content";
+static const NSInteger kContentLength = 8;
+
+static const char *kEncoded = "encoded";
+static const NSInteger kEncodedLength = 8;
+
+static const char *kGuid = "guid";
+static const NSInteger kGuidLength = 5;
+
+static const char *kPubDate = "pubDate";
+static const NSInteger kPubDateLength = 8;
+
+static const char *kAuthor = "author";
+static const NSInteger kAuthorLength = 7;
+
+static const char *kDescription = "description";
+static const NSInteger kDescriptionLength = 12;
+
+static const char *kRSS = "rss";
+static const NSInteger kRSSLength = 4;
+
+static const char *kURL = "url";
+static const NSInteger kURLLength = 4;
+
+static const char *kLength = "length";
+static const NSInteger kLengthLength = 7;
+
+static const char *kType = "type";
+static const NSInteger kTypeLength = 5;
+
+static const char *kIsPermaLink = "isPermaLink";
+static const NSInteger kIsPermaLinkLength = 12;
+
+static const char *kRDF = "rdf";
+static const NSInteger kRDFlength = 4;
+
+static const char *kAbout = "about";
+static const NSInteger kAboutLength = 6;
+
+static const char *kFalse = "false";
+static const NSInteger kFalseLength = 6;
+
+static const char *kTrue = "true";
+static const NSInteger kTrueLength = 5;
+
+
+#pragma mark - Parsing
+
+- (void)parse {
+
+	self.dateParsed = [NSDate date];
+
+	@autoreleasepool {
+		[self.parser parseData:self.feedData];
+		[self.parser finishParsing];
+	}
+	
+	// Optimization: make articles do calculations on this background thread.
+	[self.articles makeObjectsPerformSelector:@selector(calculateArticleID)];
+}
+
+
+- (void)addArticle {
+
+	RSParsedArticle *article = [[RSParsedArticle alloc] initWithFeedURL:self.urlString];
+	article.dateParsed = self.dateParsed;
+	
+	[self.articles addObject:article];
+}
+
+
+- (RSParsedArticle *)currentArticle {
+
+	return self.articles.lastObject;
+}
+
+
+- (void)addFeedElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix {
+
+	if (prefix != NULL) {
+		return;
+	}
+
+	if (RSSAXEqualTags(localName, kLink, kLinkLength)) {
+		if (!self.link) {
+			self.link = self.parser.currentStringWithTrimmedWhitespace;
+		}
+	}
+
+	else if (RSSAXEqualTags(localName, kTitle, kTitleLength)) {
+		self.title = self.parser.currentStringWithTrimmedWhitespace;
+	}
+}
+
+
+- (void)addDCElement:(const xmlChar *)localName {
+
+	if (RSSAXEqualTags(localName, kCreator, kCreatorLength)) {
+
+		self.currentArticle.author = self.parser.currentStringWithTrimmedWhitespace;
+	}
+	else if (RSSAXEqualTags(localName, kDate, kDateLength)) {
+
+		self.currentArticle.datePublished = self.currentDate;
+	}
+}
+
+
+- (void)addGuid {
+
+	self.currentArticle.guid = self.parser.currentStringWithTrimmedWhitespace;
+
+	NSString *isPermaLinkValue = [self.currentAttributes rsxml_objectForCaseInsensitiveKey:@"ispermalink"];
+	if (!isPermaLinkValue || ![isPermaLinkValue isEqualToString:@"false"]) {
+		self.currentArticle.permalink = [self urlString:self.currentArticle.guid];
+	}
+}
+
+
+- (NSString *)urlString:(NSString *)s {
+
+	/*Resolve against home page URL (if available) or feed URL.*/
+
+	if ([[s lowercaseString] hasPrefix:@"http"]) {
+		return s;
+	}
+
+	if (!self.link) {
+		//TODO: get feed URL and use that to resolve URL.*/
+		return s;
+	}
+
+	NSURL *baseURL = [NSURL URLWithString:self.link];
+	if (!baseURL) {
+		return s;
+	}
+
+	NSURL *resolvedURL = [NSURL URLWithString:s relativeToURL:baseURL];
+	if (resolvedURL.absoluteString) {
+		return resolvedURL.absoluteString;
+	}
+
+	return s;
+}
+
+
+- (NSString *)currentStringWithHTMLEntitiesDecoded {
+
+	return [self.parser.currentStringWithTrimmedWhitespace rs_stringByDecodingHTMLEntities];
+}
+
+- (void)addArticleElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix {
+
+	if (RSSAXEqualTags(prefix, kDC, kDCLength)) {
+
+		[self addDCElement:localName];
+		return;
+	}
+
+	if (RSSAXEqualTags(prefix, kContent, kContentLength) && RSSAXEqualTags(localName, kEncoded, kEncodedLength)) {
+
+		self.currentArticle.body = [self currentStringWithHTMLEntitiesDecoded];
+		return;
+	}
+
+	if (prefix != NULL) {
+		return;
+	}
+
+	if (RSSAXEqualTags(localName, kGuid, kGuidLength)) {
+		[self addGuid];
+	}
+	else if (RSSAXEqualTags(localName, kPubDate, kPubDateLength)) {
+		self.currentArticle.datePublished = self.currentDate;
+	}
+	else if (RSSAXEqualTags(localName, kAuthor, kAuthorLength)) {
+		self.currentArticle.author = self.parser.currentStringWithTrimmedWhitespace;
+	}
+	else if (RSSAXEqualTags(localName, kLink, kLinkLength)) {
+		self.currentArticle.link = [self urlString:self.parser.currentStringWithTrimmedWhitespace];
+	}
+	else if (RSSAXEqualTags(localName, kDescription, kDescriptionLength)) {
+
+		if (!self.currentArticle.body) {
+			self.currentArticle.body = [self currentStringWithHTMLEntitiesDecoded];
+		}
+	}
+	else if (RSSAXEqualTags(localName, kTitle, kTitleLength)) {
+		self.currentArticle.title = [self currentStringWithHTMLEntitiesDecoded];
+	}
+}
+
+
+- (NSDate *)currentDate {
+
+	return RSDateWithBytes(self.parser.currentCharacters.bytes, self.parser.currentCharacters.length);
+}
+
+
+#pragma mark - RSSAXParserDelegate
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLStartElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri numberOfNamespaces:(NSInteger)numberOfNamespaces namespaces:(const xmlChar **)namespaces numberOfAttributes:(NSInteger)numberOfAttributes numberDefaulted:(int)numberDefaulted attributes:(const xmlChar **)attributes {
+
+	if (self.endRSSFound) {
+		return;
+	}
+
+	NSDictionary *xmlAttributes = nil;
+	if (RSSAXEqualTags(localName, kItem, kItemLength) || RSSAXEqualTags(localName, kGuid, kGuidLength)) {
+		xmlAttributes = [self.parser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
+	}
+	if (self.currentAttributes != xmlAttributes) {
+		self.currentAttributes = xmlAttributes;
+	}
+
+	if (!prefix && RSSAXEqualTags(localName, kItem, kItemLength)) {
+
+		[self addArticle];
+		self.parsingArticle = YES;
+
+		if (xmlAttributes && xmlAttributes[kRDFAboutKey]) { /*RSS 1.0 guid*/
+			self.currentArticle.guid = xmlAttributes[kRDFAboutKey];
+			self.currentArticle.permalink = self.currentArticle.guid;
+		}
+	}
+
+	else if (!prefix && RSSAXEqualTags(localName, kImage, kImageLength)) {
+		self.parsingChannelImage = YES;
+	}
+
+	if (!self.parsingChannelImage) {
+		[self.parser beginStoringCharacters];
+	}
+}
+
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri {
+
+	if (self.endRSSFound) {
+		return;
+	}
+
+	if (RSSAXEqualTags(localName, kRSS, kRSSLength)) {
+		self.endRSSFound = YES;
+	}
+
+	else if (RSSAXEqualTags(localName, kImage, kImageLength)) {
+		self.parsingChannelImage = NO;
+	}
+
+	else if (RSSAXEqualTags(localName, kItem, kItemLength)) {
+		self.parsingArticle = NO;
+	}
+
+	else if (self.parsingArticle) {
+		[self addArticleElement:localName prefix:prefix];
+	}
+
+	else if (!self.parsingChannelImage) {
+		[self addFeedElement:localName prefix:prefix];
+	}
+}
+
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForName:(const xmlChar *)name prefix:(const xmlChar *)prefix {
+
+	if (RSSAXEqualTags(prefix, kRDF, kRDFlength)) {
+
+		if (RSSAXEqualTags(name, kAbout, kAboutLength)) {
+			return kRDFAboutKey;
+		}
+
+		return nil;
+	}
+
+	if (prefix) {
+		return nil;
+	}
+
+	if (RSSAXEqualTags(name, kIsPermaLink, kIsPermaLinkLength)) {
+		return kIsPermaLinkKey;
+	}
+
+	if (RSSAXEqualTags(name, kURL, kURLLength)) {
+		return kURLKey;
+	}
+
+	if (RSSAXEqualTags(name, kLength, kLengthLength)) {
+		return kLengthKey;
+	}
+
+	if (RSSAXEqualTags(name, kType, kTypeLength)) {
+		return kTypeKey;
+	}
+
+	return nil;
+}
+
+
+static BOOL equalBytes(const void *bytes1, const void *bytes2, NSUInteger length) {
+
+	return memcmp(bytes1, bytes2, length) == 0;
+}
+
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForValue:(const void *)bytes length:(NSUInteger)length {
+
+	static const NSUInteger falseLength = kFalseLength - 1;
+	static const NSUInteger trueLength = kTrueLength - 1;
+
+	if (length == falseLength && equalBytes(bytes, kFalse, falseLength)) {
+		return kFalseValue;
+	}
+
+	if (length == trueLength && equalBytes(bytes, kTrue, trueLength)) {
+		return kTrueValue;
+	}
+
+	return nil;
+}
+
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLAttributes.h
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLAttributes.h
@ -0,0 +1,36 @@
+//
+//  RSOPMLAttributes.h
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+// OPML allows for arbitrary attributes.
+// These are the common attributes in OPML files used as RSS subscription lists.
+
+extern NSString *OPMLTextKey; //text
+extern NSString *OPMLTitleKey; //title
+extern NSString *OPMLDescriptionKey; //description
+extern NSString *OPMLTypeKey; //type
+extern NSString *OPMLVersionKey; //version
+extern NSString *OPMLHMTLURLKey; //htmlUrl
+extern NSString *OPMLXMLURLKey; //xmlUrl
+
+
+@interface NSDictionary (RSOPMLAttributes)
+
+// A frequent error in OPML files is to mess up the capitalization,
+// so these do a case-insensitive lookup.
+
+@property (nonatomic, readonly) NSString *opml_text;
+@property (nonatomic, readonly) NSString *opml_title;
+@property (nonatomic, readonly) NSString *opml_description;
+@property (nonatomic, readonly) NSString *opml_type;
+@property (nonatomic, readonly) NSString *opml_version;
+@property (nonatomic, readonly) NSString *opml_htmlUrl;
+@property (nonatomic, readonly) NSString *opml_xmlUrl;
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLAttributes.m
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLAttributes.m
@ -0,0 +1,66 @@
+//
+//  RSOPMLAttributes.m
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSOPMLAttributes.h"
+#import "RSXMLInternal.h"
+
+
+NSString *OPMLTextKey = @"text";
+NSString *OPMLTitleKey = @"title";
+NSString *OPMLDescriptionKey = @"description";
+NSString *OPMLTypeKey = @"type";
+NSString *OPMLVersionKey = @"version";
+NSString *OPMLHMTLURLKey = @"htmlUrl";
+NSString *OPMLXMLURLKey = @"xmlUrl";
+
+
+@implementation NSDictionary (RSOPMLAttributes)
+
+- (NSString *)opml_text {
+
+	return [self rsxml_objectForCaseInsensitiveKey:OPMLTextKey];
+}
+
+
+- (NSString *)opml_title {
+
+	return [self rsxml_objectForCaseInsensitiveKey:OPMLTitleKey];
+}
+
+
+- (NSString *)opml_description {
+
+	return [self rsxml_objectForCaseInsensitiveKey:OPMLDescriptionKey];
+}
+
+
+- (NSString *)opml_type {
+
+	return [self rsxml_objectForCaseInsensitiveKey:OPMLTypeKey];
+}
+
+
+- (NSString *)opml_version {
+
+	return [self rsxml_objectForCaseInsensitiveKey:OPMLVersionKey];
+}
+
+
+- (NSString *)opml_htmlUrl {
+
+	return [self rsxml_objectForCaseInsensitiveKey:OPMLHMTLURLKey];
+}
+
+
+- (NSString *)opml_xmlUrl {
+
+	return [self rsxml_objectForCaseInsensitiveKey:OPMLXMLURLKey];
+}
+
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLDocument.h
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLDocument.h
@ -0,0 +1,17 @@
+//
+//  RSOPMLDocument.h
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+#import "RSOPMLItem.h"
+
+
+@interface RSOPMLDocument : RSOPMLItem
+
+@property (nonatomic) NSString *title;
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLDocument.m
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLDocument.m
@ -0,0 +1,13 @@
+//
+//  RSOPMLDocument.m
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSOPMLDocument.h"
+
+@implementation RSOPMLDocument
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLFeedSpecifier.h
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLFeedSpecifier.h
@ -0,0 +1,23 @@
+//
+//  RSOPMLFeedSpecifier.h
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+
+@interface RSOPMLFeedSpecifier : NSObject
+
+
+- (instancetype)initWithTitle:(NSString *)title feedDescription:(NSString *)feedDescription homePageURL:(NSString *)homePageURL feedURL:(NSString *)feedURL;
+
+@property (nonatomic, readonly) NSString *title;
+@property (nonatomic, readonly) NSString *feedDescription;
+@property (nonatomic, readonly) NSString *homePageURL;
+@property (nonatomic, readonly) NSString *feedURL;
+
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLFeedSpecifier.m
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLFeedSpecifier.m
@ -0,0 +1,50 @@
+//
+//  RSOPMLFeedSpecifier.m
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSOPMLFeedSpecifier.h"
+#import "RSXMLInternal.h"
+
+
+@implementation RSOPMLFeedSpecifier
+
+- (instancetype)initWithTitle:(NSString *)title feedDescription:(NSString *)feedDescription homePageURL:(NSString *)homePageURL feedURL:(NSString *)feedURL {
+
+	NSParameterAssert(!RSXMLIsEmpty(feedURL));
+	
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	if (RSXMLIsEmpty(title)) {
+		_title = nil;
+	}
+	else {
+		_title = title;
+	}
+
+	if (RSXMLIsEmpty(feedDescription)) {
+		_feedDescription = nil;
+	}
+	else {
+		_feedDescription = feedDescription;
+	}
+
+	if (RSXMLIsEmpty(homePageURL)) {
+		_homePageURL = nil;
+	}
+	else {
+		_homePageURL = homePageURL;
+	}
+
+	_feedURL = feedURL;
+
+	return self;
+}
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLItem.h
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLItem.h
@ -0,0 +1,26 @@
+//
+//  RSOPMLItem.h
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+@class RSOPMLFeedSpecifier;
+
+
+@interface RSOPMLItem : NSObject
+
+@property (nonatomic) NSDictionary *attributes;
+@property (nonatomic) NSArray *children;
+
+- (void)addChild:(RSOPMLItem *)child;
+
+@property (nonatomic, readonly) RSOPMLFeedSpecifier *OPMLFeedSpecifier; //May be nil.
+
+@property (nonatomic, readonly) NSString *titleFromAttributes; //May be nil.
+@property (nonatomic, readonly) BOOL isFolder;
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLItem.m
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLItem.m
@ -0,0 +1,86 @@
+//
+//  RSOPMLItem.m
+//  RSXML
+//
+//  Created by Brent Simmons on 2/28/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSOPMLItem.h"
+#import "RSOPMLAttributes.h"
+#import "RSOPMLFeedSpecifier.h"
+#import "RSXMLInternal.h"
+
+
+@interface RSOPMLItem ()
+
+@property (nonatomic) NSMutableArray *mutableChildren;
+
+@end
+
+
+@implementation RSOPMLItem
+
+@synthesize children = _children;
+@synthesize OPMLFeedSpecifier = _OPMLFeedSpecifier;
+
+
+- (NSArray *)children {
+
+	return [self.mutableChildren copy];
+}
+
+
+- (void)setChildren:(NSArray *)children {
+
+	_children = children;
+	self.mutableChildren = [_children mutableCopy];
+}
+
+
+- (void)addChild:(RSOPMLItem *)child {
+
+	if (!self.mutableChildren) {
+		self.mutableChildren = [NSMutableArray new];
+	}
+
+	[self.mutableChildren addObject:child];
+}
+
+
+- (RSOPMLFeedSpecifier *)OPMLFeedSpecifier {
+
+	if (_OPMLFeedSpecifier) {
+		return _OPMLFeedSpecifier;
+	}
+
+	NSString *feedURL = self.attributes.opml_xmlUrl;
+	if (RSXMLIsEmpty(feedURL)) {
+		return nil;
+	}
+
+	_OPMLFeedSpecifier = [[RSOPMLFeedSpecifier alloc] initWithTitle:self.attributes.opml_title feedDescription:self.attributes.opml_description homePageURL:self.attributes.opml_htmlUrl feedURL:feedURL];
+
+	return _OPMLFeedSpecifier;
+}
+
+- (NSString *)titleFromAttributes {
+	
+	NSString *title = self.attributes.opml_title;
+	if (title) {
+		return title;
+	}
+	title = self.attributes.opml_text;
+	if (title) {
+		return title;
+	}
+	
+	return nil;
+}
+
+- (BOOL)isFolder {
+	
+	return self.mutableChildren.count > 0;
+}
+
+@end
--- a/Frameworks/RSParser/XML/OPML/RSOPMLParser.h
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLParser.h
@ -0,0 +1,29 @@
+//
+//  RSOPMLParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 7/12/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+
+@class RSXMLData;
+@class RSOPMLDocument;
+
+
+typedef void (^RSParsedOPMLBlock)(RSOPMLDocument *OPMLDocument, NSError *error);
+
+void RSParseOPML(RSXMLData *xmlData, RSParsedOPMLBlock callback); //async; calls back on main thread.
+
+
+@interface RSOPMLParser: NSObject
+
+- (instancetype)initWithXMLData:(RSXMLData *)xmlData;
+
+@property (nonatomic, readonly) RSOPMLDocument *OPMLDocument;
+@property (nonatomic, readonly) NSError *error;
+
+@end
+
--- a/Frameworks/RSParser/XML/OPML/RSOPMLParser.m
+++ b/Frameworks/RSParser/XML/OPML/RSOPMLParser.m
@ -0,0 +1,297 @@
+//
+//  RSOPMLParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 7/12/15.
+//  Copyright © 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+#import "RSOPMLParser.h"
+#import <libxml/xmlstring.h>
+#import "RSXMLData.h"
+#import "RSSAXParser.h"
+#import "RSOPMLItem.h"
+#import "RSOPMLDocument.h"
+#import "RSOPMLAttributes.h"
+#import "RSXMLError.h"
+
+
+void RSParseOPML(RSXMLData *xmlData, RSParsedOPMLBlock callback) {
+
+	NSCParameterAssert(xmlData);
+	NSCParameterAssert(callback);
+
+	dispatch_async(dispatch_get_global_queue(QOS_CLASS_DEFAULT, 0), ^{
+
+		@autoreleasepool {
+
+			RSOPMLParser *parser = [[RSOPMLParser alloc] initWithXMLData:xmlData];
+
+			RSOPMLDocument *document = parser.OPMLDocument;
+			NSError *error = parser.error;
+
+			dispatch_async(dispatch_get_main_queue(), ^{
+
+				callback(document, error);
+			});
+		}
+	});
+}
+
+
+@interface RSOPMLParser () <RSSAXParserDelegate>
+
+@property (nonatomic, readwrite) RSOPMLDocument *OPMLDocument;
+@property (nonatomic, readwrite) NSError *error;
+@property (nonatomic) NSMutableArray *itemStack;
+
+@end
+
+
+@implementation RSOPMLParser
+
+
+#pragma mark - Init
+
+- (instancetype)initWithXMLData:(RSXMLData *)XMLData {
+
+	self = [super init];
+	if (!self) {
+		return nil;
+	}
+
+	[self parse:XMLData];
+
+	return self;
+}
+
+
+#pragma mark - Private
+
+- (void)parse:(RSXMLData *)XMLData {
+
+	@autoreleasepool {
+
+		if (![self canParseData:XMLData.data]) {
+
+			NSString *filename = nil;
+			NSURL *url = [NSURL URLWithString:XMLData.urlString];
+			if (url && url.isFileURL) {
+				filename = url.path.lastPathComponent;
+			}
+			if ([XMLData.urlString hasPrefix:@"http"]) {
+				filename = XMLData.urlString;
+			}
+			if (!filename) {
+				filename = XMLData.urlString;
+			}
+			self.error = RSOPMLWrongFormatError(filename);
+			return;
+		}
+		
+		RSSAXParser *parser = [[RSSAXParser alloc] initWithDelegate:self];
+
+		self.itemStack = [NSMutableArray new];
+		self.OPMLDocument = [RSOPMLDocument new];
+		[self pushItem:self.OPMLDocument];
+
+		[parser parseData:XMLData.data];
+		[parser finishParsing];
+	}
+}
+
+- (BOOL)canParseData:(NSData *)d {
+
+	// Check for <opml and <outline near the top.
+
+	@autoreleasepool {
+
+		NSString *s = [[NSString alloc] initWithBytesNoCopy:(void *)d.bytes length:d.length encoding:NSUTF8StringEncoding freeWhenDone:NO];
+		if (!s) {
+			NSDictionary *options = @{NSStringEncodingDetectionSuggestedEncodingsKey : @[@(NSUTF8StringEncoding)]};
+			(void)[NSString stringEncodingForData:d encodingOptions:options convertedString:&s usedLossyConversion:nil];
+		}
+		if (!s) {
+			return NO;
+		}
+
+		static const NSInteger numberOfCharactersToSearch = 4096;
+		NSRange rangeToSearch = NSMakeRange(0, numberOfCharactersToSearch);
+		if (s.length < numberOfCharactersToSearch) {
+			rangeToSearch.length = s.length;
+		}
+
+		NSRange opmlRange = [s rangeOfString:@"<opml" options:NSCaseInsensitiveSearch range:rangeToSearch];
+		if (opmlRange.length < 1) {
+			return NO;
+		}
+
+		NSRange outlineRange = [s rangeOfString:@"<outline" options:NSLiteralSearch range:rangeToSearch];
+		if (outlineRange.length < 1) {
+			return NO;
+		}
+
+		if (outlineRange.location < opmlRange.location) {
+			return NO;
+		}
+	}
+
+	return YES;
+}
+
+- (void)pushItem:(RSOPMLItem *)item {
+
+	[self.itemStack addObject:item];
+}
+
+
+- (void)popItem {
+
+	NSAssert(self.itemStack.count > 0, nil);
+
+	/*If itemStack is empty, bad things are happening.
+	 But we still shouldn't crash in production.*/
+
+	if (self.itemStack.count > 0) {
+		[self.itemStack removeLastObject];
+	}
+}
+
+
+- (RSOPMLItem *)currentItem {
+	
+	return self.itemStack.lastObject;
+}
+
+
+#pragma mark - RSSAXParserDelegate
+
+static const char *kOutline = "outline";
+static const char kOutlineLength = 8;
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLStartElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri numberOfNamespaces:(NSInteger)numberOfNamespaces namespaces:(const xmlChar **)namespaces numberOfAttributes:(NSInteger)numberOfAttributes numberDefaulted:(int)numberDefaulted attributes:(const xmlChar **)attributes {
+
+	if (!RSSAXEqualTags(localName, kOutline, kOutlineLength)) {
+		return;
+	}
+
+	RSOPMLItem *item = [RSOPMLItem new];
+	item.attributes = [SAXParser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
+
+	[[self currentItem] addChild:item];
+	[self pushItem:item];
+}
+
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri {
+
+	if (RSSAXEqualTags(localName, kOutline, kOutlineLength)) {
+		[self popItem];
+	}
+}
+
+
+static const char *kText = "text";
+static const NSInteger kTextLength = 5;
+
+static const char *kTitle = "title";
+static const NSInteger kTitleLength = 6;
+
+static const char *kDescription = "description";
+static const NSInteger kDescriptionLength = 12;
+
+static const char *kType = "type";
+static const NSInteger kTypeLength = 5;
+
+static const char *kVersion = "version";
+static const NSInteger kVersionLength = 8;
+
+static const char *kHTMLURL = "htmlUrl";
+static const NSInteger kHTMLURLLength = 8;
+
+static const char *kXMLURL = "xmlUrl";
+static const NSInteger kXMLURLLength = 7;
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForName:(const xmlChar *)name prefix:(const xmlChar *)prefix {
+
+	if (prefix) {
+		return nil;
+	}
+
+	size_t nameLength = strlen((const char *)name);
+
+	if (nameLength == kTextLength - 1) {
+		if (RSSAXEqualTags(name, kText, kTextLength)) {
+			return OPMLTextKey;
+		}
+		if (RSSAXEqualTags(name, kType, kTypeLength)) {
+			return OPMLTypeKey;
+		}
+	}
+
+	else if (nameLength == kTitleLength - 1) {
+		if (RSSAXEqualTags(name, kTitle, kTitleLength)) {
+			return OPMLTitleKey;
+		}
+	}
+
+	else if (nameLength == kXMLURLLength - 1) {
+		if (RSSAXEqualTags(name, kXMLURL, kXMLURLLength)) {
+			return OPMLXMLURLKey;
+		}
+	}
+
+	else if (nameLength == kVersionLength - 1) {
+		if (RSSAXEqualTags(name, kVersion, kVersionLength)) {
+			return OPMLVersionKey;
+		}
+		if (RSSAXEqualTags(name, kHTMLURL, kHTMLURLLength)) {
+			return OPMLHMTLURLKey;
+		}
+	}
+
+	else if (nameLength == kDescriptionLength - 1) {
+		if (RSSAXEqualTags(name, kDescription, kDescriptionLength)) {
+			return OPMLDescriptionKey;
+		}
+	}
+
+	return nil;
+}
+
+
+static const char *kRSSUppercase = "RSS";
+static const char *kRSSLowercase = "rss";
+static const NSUInteger kRSSLength = 3;
+static NSString *RSSUppercaseValue = @"RSS";
+static NSString *RSSLowercaseValue = @"rss";
+static NSString *emptyString = @"";
+
+static BOOL equalBytes(const void *bytes1, const void *bytes2, NSUInteger length) {
+
+	return memcmp(bytes1, bytes2, length) == 0;
+}
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForValue:(const void *)bytes length:(NSUInteger)length {
+
+
+	if (length < 1) {
+		return emptyString;
+	}
+
+	if (length == kRSSLength) {
+
+		if (equalBytes(bytes, kRSSUppercase, kRSSLength)) {
+			return RSSUppercaseValue;
+		}
+		else if (equalBytes(bytes, kRSSLowercase, kRSSLength)) {
+			return RSSLowercaseValue;
+		}
+
+	}
+
+	return nil;
+}
+
+
+@end
--- a/Frameworks/RSParser/XML/SAX/RSSAXParser.h
+++ b/Frameworks/RSParser/XML/SAX/RSSAXParser.h
@ -0,0 +1,68 @@
+//
+//  RSSAXParser.h
+//  RSXML
+//
+//  Created by Brent Simmons on 3/25/15.
+//  Copyright (c) 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+@import Foundation;
+
+/*Thread-safe, not re-entrant.
+
+ Calls to the delegate will happen on the same thread where the parser runs.
+
+ This is a low-level streaming XML parser, a thin wrapper for libxml2's SAX parser. It doesn't do much Foundation-ifying quite on purpose -- because the goal is performance and low memory use.
+
+ This class is not meant to be sub-classed. Use the delegate methods.
+ */
+
+
+@class RSSAXParser;
+
+@protocol RSSAXParserDelegate <NSObject>
+
+@optional
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLStartElement:(const unsigned char *)localName prefix:(const unsigned char *)prefix uri:(const unsigned char *)uri numberOfNamespaces:(NSInteger)numberOfNamespaces namespaces:(const unsigned char **)namespaces numberOfAttributes:(NSInteger)numberOfAttributes numberDefaulted:(int)numberDefaulted attributes:(const unsigned char **)attributes;
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const unsigned char *)localName prefix:(const unsigned char *)prefix uri:(const unsigned char *)uri;
+
+- (void)saxParser:(RSSAXParser *)SAXParser XMLCharactersFound:(const unsigned char *)characters length:(NSUInteger)length;
+
+- (void)saxParserDidReachEndOfDocument:(RSSAXParser *)SAXParser; /*If canceled, may not get called (but might).*/
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForName:(const unsigned char *)name prefix:(const unsigned char *)prefix; /*Okay to return nil. Prefix may be nil.*/
+
+- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForValue:(const void *)bytes length:(NSUInteger)length;
+
+@end
+
+
+void RSSAXInitLibXMLParser(void); // Needed by RSSAXHTMLParser.
+
+/*For use by delegate.*/
+
+BOOL RSSAXEqualTags(const unsigned char *localName, const char *tag, NSInteger tagLength);
+
+
+@interface RSSAXParser : NSObject
+
+- (instancetype)initWithDelegate:(id<RSSAXParserDelegate>)delegate;
+
+- (void)parseData:(NSData *)data;
+- (void)parseBytes:(const void *)bytes numberOfBytes:(NSUInteger)numberOfBytes;
+- (void)finishParsing;
+- (void)cancel;
+
+@property (nonatomic, strong, readonly) NSData *currentCharacters; /*nil if not storing characters. UTF-8 encoded.*/
+@property (nonatomic, strong, readonly) NSString *currentString; /*Convenience to get string version of currentCharacters.*/
+@property (nonatomic, strong, readonly) NSString *currentStringWithTrimmedWhitespace;
+
+- (void)beginStoringCharacters; /*Delegate can call from XMLStartElement. Characters will be available in XMLEndElement as currentCharacters property. Storing characters is stopped after each XMLEndElement.*/
+
+/*Delegate can call from within XMLStartElement. Returns nil if numberOfAttributes < 1.*/
+
+- (NSDictionary *)attributesDictionary:(const unsigned char **)attributes numberOfAttributes:(NSInteger)numberOfAttributes;
+
+@end
--- a/Frameworks/RSParser/XML/SAX/RSSAXParser.m
+++ b/Frameworks/RSParser/XML/SAX/RSSAXParser.m
@ -0,0 +1,346 @@
+//
+//  RSSAXParser.m
+//  RSXML
+//
+//  Created by Brent Simmons on 3/25/15.
+//  Copyright (c) 2015 Ranchero Software, LLC. All rights reserved.
+//
+
+#import <libxml/tree.h>
+#import <libxml/xmlstring.h>
+#import "RSSAXParser.h"
+#import "RSXMLInternal.h"
+
+
+@interface RSSAXParser ()
+
+@property (nonatomic, weak) id<RSSAXParserDelegate> delegate;
+@property (nonatomic, assign) xmlParserCtxtPtr context;
+@property (nonatomic, assign) BOOL storingCharacters;
+@property (nonatomic) NSMutableData *characters;
+@property (nonatomic) BOOL delegateRespondsToInternedStringMethod;
+@property (nonatomic) BOOL delegateRespondsToInternedStringForValueMethod;
+@property (nonatomic) BOOL delegateRespondsToStartElementMethod;
+@property (nonatomic) BOOL delegateRespondsToEndElementMethod;
+@property (nonatomic) BOOL delegateRespondsToCharactersFoundMethod;
+@property (nonatomic) BOOL delegateRespondsToEndOfDocumentMethod;
+
+@end
+
+
+@implementation RSSAXParser
+
+ (void)initialize {
+
+	RSSAXInitLibXMLParser();
+}
+
+
+#pragma mark - Init
+
+- (instancetype)initWithDelegate:(id<RSSAXParserDelegate>)delegate {
+
+	self = [super init];
+	if (self == nil)
+		return nil;
+
+	_delegate = delegate;
+
+	if ([_delegate respondsToSelector:@selector(saxParser:internedStringForName:prefix:)]) {
+		_delegateRespondsToInternedStringMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParser:internedStringForValue:length:)]) {
+		_delegateRespondsToInternedStringForValueMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParser:XMLStartElement:prefix:uri:numberOfNamespaces:namespaces:numberOfAttributes:numberDefaulted:attributes:)]) {
+		_delegateRespondsToStartElementMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParser:XMLEndElement:prefix:uri:)]) {
+		_delegateRespondsToEndElementMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParser:XMLCharactersFound:length:)]) {
+		_delegateRespondsToCharactersFoundMethod = YES;
+	}
+	if ([_delegate respondsToSelector:@selector(saxParserDidReachEndOfDocument:)]) {
+		_delegateRespondsToEndOfDocumentMethod = YES;
+	}
+
+	return self;
+}
+
+
+#pragma mark - Dealloc
+
+- (void)dealloc {
+	if (_context != nil) {
+		xmlFreeParserCtxt(_context);
+		_context = nil;
+	}
+	_delegate = nil;
+}
+
+
+#pragma mark - API
+
+static xmlSAXHandler saxHandlerStruct;
+
+- (void)parseData:(NSData *)data {
+
+	[self parseBytes:data.bytes numberOfBytes:data.length];
+}
+
+
+- (void)parseBytes:(const void *)bytes numberOfBytes:(NSUInteger)numberOfBytes {
+
+	if (self.context == nil) {
+
+		self.context = xmlCreatePushParserCtxt(&saxHandlerStruct, (__bridge void *)self, nil, 0, nil);
+		xmlCtxtUseOptions(self.context, XML_PARSE_RECOVER | XML_PARSE_NOENT);
+	}
+
+	@autoreleasepool {
+		xmlParseChunk(self.context, (const char *)bytes, (int)numberOfBytes, 0);
+	}
+}
+
+
+- (void)finishParsing {
+
+	NSAssert(self.context != nil, nil);
+	if (self.context == nil)
+		return;
+
+	@autoreleasepool {
+		xmlParseChunk(self.context, nil, 0, 1);
+		xmlFreeParserCtxt(self.context);
+		self.context = nil;
+		self.characters = nil;
+	}
+}
+
+
+- (void)cancel {
+
+	@autoreleasepool {
+		xmlStopParser(self.context);
+	}
+}
+
+
+- (void)beginStoringCharacters {
+	self.storingCharacters = YES;
+	self.characters = [NSMutableData new];
+}
+
+
+- (void)endStoringCharacters {
+	self.storingCharacters = NO;
+	self.characters = nil;
+}
+
+
+- (NSData *)currentCharacters {
+
+	if (!self.storingCharacters) {
+		return nil;
+	}
+
+	return self.characters;
+}
+
+
+- (NSString *)currentString {
+
+	NSData *d = self.currentCharacters;
+	if (RSXMLIsEmpty(d)) {
+		return nil;
+	}
+
+	return [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
+}
+
+
+- (NSString *)currentStringWithTrimmedWhitespace {
+	
+	return [self.currentString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
+}
+
+
+#pragma mark - Attributes Dictionary
+
+- (NSDictionary *)attributesDictionary:(const xmlChar **)attributes numberOfAttributes:(NSInteger)numberOfAttributes {
+
+	if (numberOfAttributes < 1 || !attributes) {
+		return nil;
+	}
+
+	NSMutableDictionary *d = [NSMutableDictionary new];
+
+	@autoreleasepool {
+		NSInteger i = 0, j = 0;
+		for (i = 0, j = 0; i < numberOfAttributes; i++, j+=5) {
+
+			NSUInteger lenValue = (NSUInteger)(attributes[j + 4] - attributes[j + 3]);
+			NSString *value = nil;
+
+			if (self.delegateRespondsToInternedStringForValueMethod) {
+				value = [self.delegate saxParser:self internedStringForValue:(const void *)attributes[j + 3] length:lenValue];
+			}
+			if (!value) {
+				value = [[NSString alloc] initWithBytes:(const void *)attributes[j + 3] length:lenValue encoding:NSUTF8StringEncoding];
+			}
+
+			NSString *attributeName = nil;
+
+			if (self.delegateRespondsToInternedStringMethod) {
+				attributeName = [self.delegate saxParser:self internedStringForName:(const xmlChar *)attributes[j] prefix:(const xmlChar *)attributes[j + 1]];
+			}
+
+			if (!attributeName) {
+				attributeName = [NSString stringWithUTF8String:(const char *)attributes[j]];
+				if (attributes[j + 1]) {
+					NSString *attributePrefix = [NSString stringWithUTF8String:(const char *)attributes[j + 1]];
+					attributeName = [NSString stringWithFormat:@"%@:%@", attributePrefix, attributeName];
+				}
+			}
+
+			if (value && attributeName) {
+				d[attributeName] = value;
+			}
+		}
+	}
+
+	return d;
+}
+
+
+#pragma mark - Equal Tags
+
+BOOL RSSAXEqualTags(const xmlChar *localName, const char *tag, NSInteger tagLength) {
+
+	if (!localName) {
+		return NO;
+	}
+	return !strncmp((const char *)localName, tag, (size_t)tagLength);
+}
+
+
+#pragma mark - Callbacks
+
+- (void)xmlEndDocument {
+
+	@autoreleasepool {
+		if (self.delegateRespondsToEndOfDocumentMethod) {
+			[self.delegate saxParserDidReachEndOfDocument:self];
+		}
+
+		[self endStoringCharacters];
+	}
+}
+
+
+- (void)xmlCharactersFound:(const xmlChar *)ch length:(NSUInteger)length {
+
+	@autoreleasepool {
+		if (self.storingCharacters) {
+			[self.characters appendBytes:(const void *)ch length:length];
+		}
+
+		if (self.delegateRespondsToCharactersFoundMethod) {
+			[self.delegate saxParser:self XMLCharactersFound:ch length:length];
+		}
+	}
+}
+
+
+- (void)xmlStartElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri numberOfNamespaces:(int)numberOfNamespaces namespaces:(const xmlChar **)namespaces numberOfAttributes:(int)numberOfAttributes numberDefaulted:(int)numberDefaulted attributes:(const xmlChar **)attributes {
+
+	@autoreleasepool {
+		if (self.delegateRespondsToStartElementMethod) {
+
+			[self.delegate saxParser:self XMLStartElement:localName prefix:prefix uri:uri numberOfNamespaces:numberOfNamespaces namespaces:namespaces numberOfAttributes:numberOfAttributes numberDefaulted:numberDefaulted attributes:attributes];
+		}
+	}
+}
+
+
+- (void)xmlEndElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri {
+
+	@autoreleasepool {
+		if (self.delegateRespondsToEndElementMethod) {
+			[self.delegate saxParser:self XMLEndElement:localName prefix:prefix uri:uri];
+		}
+
+		[self endStoringCharacters];
+	}
+}
+
+
+@end
+
+
+static void startElementSAX(void *context, const xmlChar *localname, const xmlChar *prefix, const xmlChar *URI, int nb_namespaces, const xmlChar **namespaces, int nb_attributes, int nb_defaulted, const xmlChar **attributes) {
+
+	[(__bridge RSSAXParser *)context xmlStartElement:localname prefix:prefix uri:URI numberOfNamespaces:nb_namespaces namespaces:namespaces numberOfAttributes:nb_attributes numberDefaulted:nb_defaulted attributes:attributes];
+}
+
+
+static void	endElementSAX(void *context, const xmlChar *localname, const xmlChar *prefix, const xmlChar *URI) {
+	[(__bridge RSSAXParser *)context xmlEndElement:localname prefix:prefix uri:URI];
+}
+
+
+static void	charactersFoundSAX(void *context, const xmlChar *ch, int len) {
+	[(__bridge RSSAXParser *)context xmlCharactersFound:ch length:(NSUInteger)len];
+}
+
+
+static void endDocumentSAX(void *context) {
+	[(__bridge RSSAXParser *)context xmlEndDocument];
+}
+
+
+static xmlSAXHandler saxHandlerStruct = {
+	nil,					/* internalSubset */
+	nil,					/* isStandalone   */
+	nil,					/* hasInternalSubset */
+	nil,					/* hasExternalSubset */
+	nil,					/* resolveEntity */
+	nil,					/* getEntity */
+	nil,					/* entityDecl */
+	nil,					/* notationDecl */
+	nil,					/* attributeDecl */
+	nil,					/* elementDecl */
+	nil,					/* unparsedEntityDecl */
+	nil,					/* setDocumentLocator */
+	nil,					/* startDocument */
+	endDocumentSAX,			/* endDocument */
+	nil,					/* startElement*/
+	nil,					/* endElement */
+	nil,					/* reference */
+	charactersFoundSAX,		/* characters */
+	nil,					/* ignorableWhitespace */
+	nil,					/* processingInstruction */
+	nil,					/* comment */
+	nil,					/* warning */
+	nil,					/* error */
+	nil,					/* fatalError //: unused error() get all the errors */
+	nil,					/* getParameterEntity */
+	nil,					/* cdataBlock */
+	nil,					/* externalSubset */
+	XML_SAX2_MAGIC,
+	nil,
+	startElementSAX,		/* startElementNs */
+	endElementSAX,			/* endElementNs */
+	nil						/* serror */
+};
+
+
+void RSSAXInitLibXMLParser(void) {
+
+	static dispatch_once_t onceToken;
+	dispatch_once(&onceToken, ^{
+		xmlInitParser();
+	});
+}
+