152 lines
3.1 KiB
Objective-C
Executable File
152 lines
3.1 KiB
Objective-C
Executable File
//
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// RSHTMLLinkParser.m
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// RSParser
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//
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// Created by Brent Simmons on 8/7/16.
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// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
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//
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#import <libxml/xmlstring.h>
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#import <RSParser/RSHTMLLinkParser.h>
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#import <RSParser/RSSAXHTMLParser.h>
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#import <RSParser/RSSAXParser.h>
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#import <RSParser/RSParserInternal.h>
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#import <RSParser/ParserData.h>
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@interface RSHTMLLinkParser() <RSSAXHTMLParserDelegate>
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@property (nonatomic, readonly) NSMutableArray *links;
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@property (nonatomic, readonly) ParserData *parserData;
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@property (nonatomic, readonly) NSMutableArray *dictionaries;
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@property (nonatomic, readonly) NSURL *baseURL;
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@end
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@interface RSHTMLLink()
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@property (nonatomic, readwrite) NSString *urlString; //absolute
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@property (nonatomic, readwrite) NSString *text;
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@property (nonatomic, readwrite) NSString *title; //title attribute inside anchor tag
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@end
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@implementation RSHTMLLinkParser
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#pragma mark - Class Methods
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+ (NSArray *)htmlLinksWithParserData:(ParserData *)parserData {
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RSHTMLLinkParser *parser = [[self alloc] initWithParserData:parserData];
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return parser.links;
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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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_links = [NSMutableArray new];
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_parserData = parserData;
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_dictionaries = [NSMutableArray new];
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_baseURL = [NSURL URLWithString:parserData.url];
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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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}
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- (RSHTMLLink *)currentLink {
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return self.links.lastObject;
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}
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static NSString *kHrefKey = @"href";
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- (NSString *)urlStringFromDictionary:(NSDictionary *)d {
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NSString *href = [d rsparser_objectForCaseInsensitiveKey:kHrefKey];
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if (!href) {
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return nil;
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}
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NSURL *absoluteURL = [NSURL URLWithString:href relativeToURL:self.baseURL];
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return absoluteURL.absoluteString;
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}
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static NSString *kTitleKey = @"title";
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- (NSString *)titleFromDictionary:(NSDictionary *)d {
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return [d rsparser_objectForCaseInsensitiveKey:kTitleKey];
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}
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- (void)handleLinkAttributes:(NSDictionary *)d {
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RSHTMLLink *link = self.currentLink;
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link.urlString = [self urlStringFromDictionary:d];
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link.title = [self titleFromDictionary:d];
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}
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static const char *kAnchor = "a";
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static const NSInteger kAnchorLength = 2;
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- (void)saxParser:(RSSAXHTMLParser *)SAXParser XMLStartElement:(const xmlChar *)localName attributes:(const xmlChar **)attributes {
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if (!RSSAXEqualTags(localName, kAnchor, kAnchorLength)) {
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return;
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}
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RSHTMLLink *link = [RSHTMLLink new];
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[self.links addObject:link];
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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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[SAXParser beginStoringCharacters];
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}
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- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const xmlChar *)localName {
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if (!RSSAXEqualTags(localName, kAnchor, kAnchorLength)) {
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return;
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}
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self.currentLink.text = SAXParser.currentStringWithTrimmedWhitespace;
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}
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@end
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@implementation RSHTMLLink
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@end
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