mirror of
https://github.com/Ranchero-Software/NetNewsWire.git
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571 lines
14 KiB
Objective-C
Executable File
571 lines
14 KiB
Objective-C
Executable File
//
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// RSAtomParser.m
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// RSParser
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//
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// Created by Brent Simmons on 1/15/15.
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// Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
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//
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#import <libxml/xmlstring.h>
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#import "RSAtomParser.h"
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#import "RSSAXParser.h"
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#import "RSParsedFeed.h"
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#import "RSParsedArticle.h"
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#import "NSString+RSParser.h"
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#import "RSDateParser.h"
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#import <RSParser/RSParser-Swift.h>
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@interface RSAtomParser () <RSSAXParserDelegate>
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@property (nonatomic) NSData *feedData;
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@property (nonatomic) NSString *urlString;
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@property (nonatomic) BOOL endFeedFound;
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@property (nonatomic) BOOL parsingXHTML;
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@property (nonatomic) BOOL parsingSource;
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@property (nonatomic) BOOL parsingArticle;
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@property (nonatomic) BOOL parsingAuthor;
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@property (nonatomic) NSMutableArray *attributesStack;
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@property (nonatomic, readonly) NSDictionary *currentAttributes;
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@property (nonatomic) NSMutableString *xhtmlString;
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@property (nonatomic) NSString *link;
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@property (nonatomic) NSString *title;
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@property (nonatomic) NSMutableArray *articles;
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@property (nonatomic) NSDate *dateParsed;
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@property (nonatomic) RSSAXParser *parser;
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@property (nonatomic, readonly) RSParsedArticle *currentArticle;
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@property (nonatomic, readonly) NSDate *currentDate;
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@end
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@implementation RSAtomParser
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#pragma mark - Class Methods
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+ (RSParsedFeed *)parseFeedWithData:(ParserData *)parserData {
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RSAtomParser *parser = [[[self class] alloc] initWithParserData:parserData];
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return [parser parseFeed];
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}
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#pragma mark - Init
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- (instancetype)initWithParserData:(ParserData *)parserData {
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self = [super init];
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if (!self) {
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return nil;
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}
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_feedData = parserData.data;
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_urlString = parserData.url;
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_parser = [[RSSAXParser alloc] initWithDelegate:self];
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_attributesStack = [NSMutableArray new];
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_articles = [NSMutableArray new];
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return self;
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}
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#pragma mark - API
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- (RSParsedFeed *)parseFeed {
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[self parse];
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RSParsedFeed *parsedFeed = [[RSParsedFeed alloc] initWithURLString:self.urlString title:self.title link:self.link articles:self.articles];
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return parsedFeed;
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}
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#pragma mark - Constants
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static NSString *kTypeKey = @"type";
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static NSString *kXHTMLType = @"xhtml";
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static NSString *kRelKey = @"rel";
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static NSString *kAlternateValue = @"alternate";
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static NSString *kHrefKey = @"href";
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static NSString *kXMLKey = @"xml";
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static NSString *kBaseKey = @"base";
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static NSString *kLangKey = @"lang";
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static NSString *kXMLBaseKey = @"xml:base";
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static NSString *kXMLLangKey = @"xml:lang";
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static NSString *kTextHTMLValue = @"text/html";
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static NSString *kRelatedValue = @"related";
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static NSString *kShortURLValue = @"shorturl";
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static NSString *kHTMLValue = @"html";
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static NSString *kEnValue = @"en";
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static NSString *kTextValue = @"text";
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static NSString *kSelfValue = @"self";
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static const char *kID = "id";
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static const NSInteger kIDLength = 3;
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static const char *kTitle = "title";
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static const NSInteger kTitleLength = 6;
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static const char *kContent = "content";
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static const NSInteger kContentLength = 8;
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static const char *kSummary = "summary";
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static const NSInteger kSummaryLength = 8;
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static const char *kLink = "link";
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static const NSInteger kLinkLength = 5;
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static const char *kPublished = "published";
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static const NSInteger kPublishedLength = 10;
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static const char *kUpdated = "updated";
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static const NSInteger kUpdatedLength = 8;
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static const char *kAuthor = "author";
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static const NSInteger kAuthorLength = 7;
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static const char *kEntry = "entry";
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static const NSInteger kEntryLength = 6;
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static const char *kSource = "source";
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static const NSInteger kSourceLength = 7;
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static const char *kFeed = "feed";
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static const NSInteger kFeedLength = 5;
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static const char *kType = "type";
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static const NSInteger kTypeLength = 5;
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static const char *kRel = "rel";
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static const NSInteger kRelLength = 4;
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static const char *kAlternate = "alternate";
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static const NSInteger kAlternateLength = 10;
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static const char *kHref = "href";
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static const NSInteger kHrefLength = 5;
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static const char *kXML = "xml";
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static const NSInteger kXMLLength = 4;
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static const char *kBase = "base";
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static const NSInteger kBaseLength = 5;
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static const char *kLang = "lang";
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static const NSInteger kLangLength = 5;
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static const char *kTextHTML = "text/html";
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static const NSInteger kTextHTMLLength = 10;
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static const char *kRelated = "related";
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static const NSInteger kRelatedLength = 8;
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static const char *kShortURL = "shorturl";
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static const NSInteger kShortURLLength = 9;
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static const char *kHTML = "html";
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static const NSInteger kHTMLLength = 5;
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static const char *kEn = "en";
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static const NSInteger kEnLength = 3;
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static const char *kText = "text";
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static const NSInteger kTextLength = 5;
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static const char *kSelf = "self";
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static const NSInteger kSelfLength = 5;
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#pragma mark - Parsing
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- (void)parse {
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self.dateParsed = [NSDate date];
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@autoreleasepool {
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[self.parser parseData:self.feedData];
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[self.parser finishParsing];
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}
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// Optimization: make articles do calculations on this background thread.
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[self.articles makeObjectsPerformSelector:@selector(calculateArticleID)];
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}
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- (void)addArticle {
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RSParsedArticle *article = [[RSParsedArticle alloc] initWithFeedURL:self.urlString];
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article.dateParsed = self.dateParsed;
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[self.articles addObject:article];
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}
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- (RSParsedArticle *)currentArticle {
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return self.articles.lastObject;
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}
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- (NSDictionary *)currentAttributes {
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return self.attributesStack.lastObject;
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}
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- (NSDate *)currentDate {
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return RSDateWithBytes(self.parser.currentCharacters.bytes, self.parser.currentCharacters.length);
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}
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- (void)addFeedLink {
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if (self.link && self.link.length > 0) {
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return;
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}
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NSString *related = self.currentAttributes[kRelKey];
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if (related == kAlternateValue) {
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self.link = self.currentAttributes[kHrefKey];
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}
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}
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- (void)addFeedTitle {
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if (self.title.length < 1) {
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self.title = self.parser.currentStringWithTrimmedWhitespace;
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}
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}
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- (void)addLink {
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NSString *urlString = self.currentAttributes[kHrefKey];
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if (urlString.length < 1) {
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return;
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}
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NSString *rel = self.currentAttributes[kRelKey];
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if (rel.length < 1) {
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rel = kAlternateValue;
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}
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if (rel == kAlternateValue) {
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if (!self.currentArticle.link) {
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self.currentArticle.link = urlString;
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}
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}
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else if (rel == kRelatedValue) {
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if (!self.currentArticle.permalink) {
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self.currentArticle.permalink = urlString;
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}
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}
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}
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- (void)addContent {
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self.currentArticle.body = [self currentStringWithHTMLEntitiesDecoded];
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}
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- (void)addSummary {
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if (!self.currentArticle.body) {
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self.currentArticle.body = [self currentStringWithHTMLEntitiesDecoded];
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}
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}
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- (NSString *)currentStringWithHTMLEntitiesDecoded {
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return [self.parser.currentStringWithTrimmedWhitespace rsparser_stringByDecodingHTMLEntities];
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}
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- (void)addArticleElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix {
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if (prefix) {
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return;
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}
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if (RSSAXEqualTags(localName, kID, kIDLength)) {
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self.currentArticle.guid = self.parser.currentStringWithTrimmedWhitespace;
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}
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else if (RSSAXEqualTags(localName, kTitle, kTitleLength)) {
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self.currentArticle.title = [self currentStringWithHTMLEntitiesDecoded];
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}
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else if (RSSAXEqualTags(localName, kContent, kContentLength)) {
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[self addContent];
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}
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else if (RSSAXEqualTags(localName, kSummary, kSummaryLength)) {
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[self addSummary];
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}
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else if (RSSAXEqualTags(localName, kLink, kLinkLength)) {
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[self addLink];
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}
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else if (RSSAXEqualTags(localName, kPublished, kPublishedLength)) {
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self.currentArticle.datePublished = self.currentDate;
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}
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else if (RSSAXEqualTags(localName, kUpdated, kUpdatedLength)) {
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self.currentArticle.dateModified = self.currentDate;
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}
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}
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- (void)addXHTMLTag:(const xmlChar *)localName {
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if (!localName) {
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return;
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}
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[self.xhtmlString appendString:@"<"];
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[self.xhtmlString appendString:[NSString stringWithUTF8String:(const char *)localName]];
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if (self.currentAttributes.count < 1) {
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[self.xhtmlString appendString:@">"];
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return;
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}
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for (NSString *oneKey in self.currentAttributes) {
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[self.xhtmlString appendString:@" "];
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NSString *oneValue = self.currentAttributes[oneKey];
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[self.xhtmlString appendString:oneKey];
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[self.xhtmlString appendString:@"=\""];
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oneValue = [oneValue stringByReplacingOccurrencesOfString:@"\"" withString:@"""];
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[self.xhtmlString appendString:oneValue];
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[self.xhtmlString appendString:@"\""];
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}
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[self.xhtmlString appendString:@">"];
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}
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#pragma mark - RSSAXParserDelegate
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- (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 {
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if (self.endFeedFound) {
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return;
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}
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NSDictionary *xmlAttributes = [self.parser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
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if (!xmlAttributes) {
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xmlAttributes = [NSDictionary dictionary];
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}
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[self.attributesStack addObject:xmlAttributes];
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if (self.parsingXHTML) {
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[self addXHTMLTag:localName];
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return;
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}
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if (RSSAXEqualTags(localName, kEntry, kEntryLength)) {
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self.parsingArticle = YES;
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[self addArticle];
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return;
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}
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if (RSSAXEqualTags(localName, kAuthor, kAuthorLength)) {
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self.parsingAuthor = YES;
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return;
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}
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if (RSSAXEqualTags(localName, kSource, kSourceLength)) {
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self.parsingSource = YES;
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return;
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}
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BOOL isContentTag = RSSAXEqualTags(localName, kContent, kContentLength);
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BOOL isSummaryTag = RSSAXEqualTags(localName, kSummary, kSummaryLength);
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if (self.parsingArticle && (isContentTag || isSummaryTag)) {
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NSString *contentType = xmlAttributes[kTypeKey];
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if ([contentType isEqualToString:kXHTMLType]) {
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self.parsingXHTML = YES;
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self.xhtmlString = [NSMutableString stringWithString:@""];
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return;
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}
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}
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if (!self.parsingArticle && RSSAXEqualTags(localName, kLink, kLinkLength)) {
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[self addFeedLink];
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return;
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}
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[self.parser beginStoringCharacters];
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}
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- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri {
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if (RSSAXEqualTags(localName, kFeed, kFeedLength)) {
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self.endFeedFound = YES;
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return;
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}
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if (self.endFeedFound) {
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return;
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}
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if (self.parsingXHTML) {
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BOOL isContentTag = RSSAXEqualTags(localName, kContent, kContentLength);
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BOOL isSummaryTag = RSSAXEqualTags(localName, kSummary, kSummaryLength);
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if (self.parsingArticle && (isContentTag || isSummaryTag)) {
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if (isContentTag) {
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self.currentArticle.body = [self.xhtmlString copy];
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}
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else if (isSummaryTag) {
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if (self.currentArticle.body.length < 1) {
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self.currentArticle.body = [self.xhtmlString copy];
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}
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}
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}
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if (isContentTag || isSummaryTag) {
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self.parsingXHTML = NO;
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}
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[self.xhtmlString appendString:@"</"];
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[self.xhtmlString appendString:[NSString stringWithUTF8String:(const char *)localName]];
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[self.xhtmlString appendString:@">"];
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}
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else if (RSSAXEqualTags(localName, kAuthor, kAuthorLength)) {
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self.parsingAuthor = NO;
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}
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else if (RSSAXEqualTags(localName, kEntry, kEntryLength)) {
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self.parsingArticle = NO;
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}
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else if (self.parsingArticle && !self.parsingSource) {
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[self addArticleElement:localName prefix:prefix];
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}
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else if (RSSAXEqualTags(localName, kSource, kSourceLength)) {
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self.parsingSource = NO;
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}
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else if (!self.parsingArticle && !self.parsingSource && RSSAXEqualTags(localName, kTitle, kTitleLength)) {
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[self addFeedTitle];
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}
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[self.attributesStack removeLastObject];
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}
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- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForName:(const xmlChar *)name prefix:(const xmlChar *)prefix {
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if (prefix && RSSAXEqualTags(prefix, kXML, kXMLLength)) {
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if (RSSAXEqualTags(name, kBase, kBaseLength)) {
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return kXMLBaseKey;
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}
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if (RSSAXEqualTags(name, kLang, kLangLength)) {
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return kXMLLangKey;
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}
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}
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if (prefix) {
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return nil;
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}
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if (RSSAXEqualTags(name, kRel, kRelLength)) {
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return kRelKey;
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}
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if (RSSAXEqualTags(name, kType, kTypeLength)) {
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return kTypeKey;
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}
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if (RSSAXEqualTags(name, kHref, kHrefLength)) {
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return kHrefKey;
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}
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if (RSSAXEqualTags(name, kAlternate, kAlternateLength)) {
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return kAlternateValue;
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}
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return nil;
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}
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static BOOL equalBytes(const void *bytes1, const void *bytes2, NSUInteger length) {
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return memcmp(bytes1, bytes2, length) == 0;
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}
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- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForValue:(const void *)bytes length:(NSUInteger)length {
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static const NSUInteger alternateLength = kAlternateLength - 1;
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static const NSUInteger textHTMLLength = kTextHTMLLength - 1;
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static const NSUInteger relatedLength = kRelatedLength - 1;
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static const NSUInteger shortURLLength = kShortURLLength - 1;
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static const NSUInteger htmlLength = kHTMLLength - 1;
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static const NSUInteger enLength = kEnLength - 1;
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static const NSUInteger textLength = kTextLength - 1;
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static const NSUInteger selfLength = kSelfLength - 1;
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if (length == alternateLength && equalBytes(bytes, kAlternate, alternateLength)) {
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return kAlternateValue;
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}
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if (length == textHTMLLength && equalBytes(bytes, kTextHTML, textHTMLLength)) {
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return kTextHTMLValue;
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}
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if (length == relatedLength && equalBytes(bytes, kRelated, relatedLength)) {
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return kRelatedValue;
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}
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if (length == shortURLLength && equalBytes(bytes, kShortURL, shortURLLength)) {
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return kShortURLValue;
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}
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if (length == htmlLength && equalBytes(bytes, kHTML, htmlLength)) {
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return kHTMLValue;
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}
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if (length == enLength && equalBytes(bytes, kEn, enLength)) {
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return kEnValue;
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}
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if (length == textLength && equalBytes(bytes, kText, textLength)) {
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return kTextValue;
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}
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if (length == selfLength && equalBytes(bytes, kSelf, selfLength)) {
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return kSelfValue;
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}
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return nil;
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}
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- (void)saxParser:(RSSAXParser *)SAXParser XMLCharactersFound:(const unsigned char *)characters length:(NSUInteger)length {
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if (self.parsingXHTML) {
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[self.xhtmlString appendString:[[NSString alloc] initWithBytesNoCopy:(void *)characters length:length encoding:NSUTF8StringEncoding freeWhenDone:NO]];
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}
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}
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@end
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