130 lines
2.6 KiB
Mathematica
130 lines
2.6 KiB
Mathematica
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// RSHTMLMetadataParser.m
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// RSXML
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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 <libxml/xmlstring.h>
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#import "RSHTMLMetadataParser.h"
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#import "RSXMLData.h"
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#import "RSHTMLMetadata.h"
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#import "RSSAXHTMLParser.h"
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#import "RSSAXParser.h"
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#import "RSXMLInternal.h"
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@interface RSHTMLMetadataParser () <RSSAXHTMLParserDelegate>
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@property (nonatomic, readonly) RSXMLData *xmlData;
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@property (nonatomic, readwrite) RSHTMLMetadata *metadata;
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@property (nonatomic) NSMutableArray *dictionaries;
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@property (nonatomic) BOOL didFinishParsing;
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@end
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@implementation RSHTMLMetadataParser
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#pragma mark - Class Methods
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+ (RSHTMLMetadata *)HTMLMetadataWithXMLData:(RSXMLData *)xmlData {
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RSHTMLMetadataParser *parser = [[self alloc] initWithXMLData:xmlData];
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return parser.metadata;
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}
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#pragma mark - Init
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- (instancetype)initWithXMLData:(RSXMLData *)xmlData {
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NSParameterAssert(xmlData.data);
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NSParameterAssert(xmlData.urlString);
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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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_xmlData = xmlData;
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_dictionaries = [NSMutableArray new];
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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.xmlData.data];
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[parser finishParsing];
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self.metadata = [[RSHTMLMetadata alloc] initWithURLString:self.xmlData.urlString dictionaries:[self.dictionaries copy]];
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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 rsxml_objectForCaseInsensitiveKey:kHrefKey];
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if (link) {
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return link;
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}
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return [d rsxml_objectForCaseInsensitiveKey:kSrcKey];
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}
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- (void)handleLinkAttributes:(NSDictionary *)d {
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if (RSXMLStringIsEmpty([d rsxml_objectForCaseInsensitiveKey:kRelKey])) {
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return;
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}
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if (RSXMLStringIsEmpty([self linkForDictionary:d])) {
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return;
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}
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[self.dictionaries addObject:d];
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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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- (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)) {
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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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return;
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}
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NSDictionary *d = [SAXParser attributesDictionary:attributes];
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if (!RSXMLIsEmpty(d)) {
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[self handleLinkAttributes:d];
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}
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}
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@end
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