152 lines
3.6 KiB
Mathematica
152 lines
3.6 KiB
Mathematica
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//
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// RSHTMLMetadataParser.m
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// RSParser
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//
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// Created by Brent Simmons on 3/6/16.
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// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
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//
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#import "RSHTMLMetadataParser.h"
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#import "RSHTMLMetadata.h"
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#import "RSSAXHTMLParser.h"
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#import "RSSAXHTMLParser.h"
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#import "RSSAXParser.h"
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#import "RSParserInternal.h"
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#import "ParserData.h"
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#import "RSHTMLTag.h"
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#import <libxml/xmlstring.h>
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@interface RSHTMLMetadataParser () <RSSAXHTMLParserDelegate>
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@property (nonatomic, readonly) ParserData *parserData;
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@property (nonatomic, readwrite) RSHTMLMetadata *metadata;
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@property (nonatomic) NSMutableArray *tags;
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@property (nonatomic) BOOL didFinishParsing;
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@property (nonatomic) BOOL shouldScanPastHeadSection;
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@end
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@implementation RSHTMLMetadataParser
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#pragma mark - Class Methods
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+ (RSHTMLMetadata *)HTMLMetadataWithParserData:(ParserData *)parserData {
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RSHTMLMetadataParser *parser = [[self alloc] initWithParserData:parserData];
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return parser.metadata;
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}
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#pragma mark - Init
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- (instancetype)initWithParserData:(ParserData *)parserData {
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NSParameterAssert(parserData.data);
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NSParameterAssert(parserData.url);
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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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_parserData = parserData;
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_tags = [NSMutableArray new];
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// YouTube has a weird bug where, on some pages, it puts the feed link tag after the head section, in the body section.
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// This allows for a special case where we continue to scan after the head section.
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// (Yes, this match could yield false positives, but it’s harmless.)
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_shouldScanPastHeadSection = [parserData.url rangeOfString:@"youtube" options:NSCaseInsensitiveSearch].location != NSNotFound;
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[self parse];
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return self;
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}
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#pragma mark - Parse
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- (void)parse {
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RSSAXHTMLParser *parser = [[RSSAXHTMLParser alloc] initWithDelegate:self];
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[parser parseData:self.parserData.data];
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[parser finishParsing];
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self.metadata = [[RSHTMLMetadata alloc] initWithURLString:self.parserData.url tags:self.tags];
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}
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static NSString *kHrefKey = @"href";
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static NSString *kSrcKey = @"src";
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static NSString *kRelKey = @"rel";
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- (NSString *)linkForDictionary:(NSDictionary *)d {
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NSString *link = [d rsparser_objectForCaseInsensitiveKey:kHrefKey];
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if (link) {
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return link;
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}
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return [d rsparser_objectForCaseInsensitiveKey:kSrcKey];
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}
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- (void)handleLinkAttributes:(NSDictionary *)d {
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if (RSParserStringIsEmpty([d rsparser_objectForCaseInsensitiveKey:kRelKey])) {
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return;
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}
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if (RSParserStringIsEmpty([self linkForDictionary:d])) {
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return;
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}
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RSHTMLTag *tag = [RSHTMLTag linkTagWithAttributes:d];
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[self.tags addObject:tag];
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}
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- (void)handleMetaAttributes:(NSDictionary *)d {
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RSHTMLTag *tag = [RSHTMLTag metaTagWithAttributes:d];
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[self.tags addObject:tag];
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}
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#pragma mark - RSSAXHTMLParserDelegate
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static const char *kBody = "body";
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static const NSInteger kBodyLength = 5;
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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 *kMeta = "meta";
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static const NSInteger kMetaLength = 5;
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- (void)saxParser:(RSSAXHTMLParser *)SAXParser XMLStartElement:(const xmlChar *)localName attributes:(const xmlChar **)attributes {
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if (self.didFinishParsing) {
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return;
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}
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if (RSSAXEqualTags(localName, kBody, kBodyLength) && !self.shouldScanPastHeadSection) {
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self.didFinishParsing = YES;
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return;
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}
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if (RSSAXEqualTags(localName, kLink, kLinkLength)) {
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NSDictionary *d = [SAXParser attributesDictionary:attributes];
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if (!RSParserObjectIsEmpty(d)) {
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[self handleLinkAttributes:d];
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}
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return;
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}
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if (RSSAXEqualTags(localName, kMeta, kMetaLength)) {
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NSDictionary *d = [SAXParser attributesDictionary:attributes];
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if (!RSParserObjectIsEmpty(d)) {
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[self handleMetaAttributes:d];
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}
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}
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}
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@end
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