NetNewsWire/Frameworks/RSParser/HTML/RSHTMLMetadataParser.m

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//
// RSHTMLMetadataParser.m
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// RSParser
//
// Created by Brent Simmons on 3/6/16.
// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
//
#import <libxml/xmlstring.h>
#import <RSParser/RSHTMLMetadataParser.h>
#import <RSParser/RSHTMLMetadata.h>
#import <RSParser/RSSAXHTMLParser.h>
#import <RSParser/RSSAXParser.h>
#import <RSParser/RSParserInternal.h>
#import <RSParser/ParserData.h>
@interface RSHTMLMetadataParser () <RSSAXHTMLParserDelegate>
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@property (nonatomic, readonly) ParserData *parserData;
@property (nonatomic, readwrite) RSHTMLMetadata *metadata;
@property (nonatomic) NSMutableArray *dictionaries;
@property (nonatomic) BOOL didFinishParsing;
@end
@implementation RSHTMLMetadataParser
#pragma mark - Class Methods
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+ (RSHTMLMetadata *)HTMLMetadataWithParserData:(ParserData *)parserData {
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RSHTMLMetadataParser *parser = [[self alloc] initWithParserData:parserData];
return parser.metadata;
}
#pragma mark - Init
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- (instancetype)initWithParserData:(ParserData *)parserData {
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NSParameterAssert(parserData.data);
NSParameterAssert(parserData.url);
self = [super init];
if (!self) {
return nil;
}
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_parserData = parserData;
_dictionaries = [NSMutableArray new];
[self parse];
return self;
}
#pragma mark - Parse
- (void)parse {
RSSAXHTMLParser *parser = [[RSSAXHTMLParser alloc] initWithDelegate:self];
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[parser parseData:self.parserData.data];
[parser finishParsing];
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self.metadata = [[RSHTMLMetadata alloc] initWithURLString:self.parserData.url dictionaries:[self.dictionaries copy]];
}
static NSString *kHrefKey = @"href";
static NSString *kSrcKey = @"src";
static NSString *kRelKey = @"rel";
- (NSString *)linkForDictionary:(NSDictionary *)d {
NSString *link = [d rsparser_objectForCaseInsensitiveKey:kHrefKey];
if (link) {
return link;
}
return [d rsparser_objectForCaseInsensitiveKey:kSrcKey];
}
- (void)handleLinkAttributes:(NSDictionary *)d {
if (RSParserStringIsEmpty([d rsparser_objectForCaseInsensitiveKey:kRelKey])) {
return;
}
if (RSParserStringIsEmpty([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];
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if (!RSParserObjectIsEmpty(d)) {
[self handleLinkAttributes:d];
}
}
@end