Refactoring to v.2.0
This commit is contained in:
relikd
@@ -1,351 +1,52 @@
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//
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// RSRSSParser.m
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// RSXML
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// MIT License (MIT)
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//
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// Created by Brent Simmons on 1/6/15.
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// Copyright (c) 2015 Ranchero Software LLC. All rights reserved.
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// Copyright (c) 2016 Brent Simmons
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// Copyright (c) 2018 Oleg Geier
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#import <libxml/xmlstring.h>
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#import "RSRSSParser.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 "RSXMLData.h"
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#import "RSXMLInternal.h"
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#import "NSString+RSXML.h"
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#import "RSDateParser.h"
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#import "NSDictionary+RSXML.h"
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@interface RSRSSParser () <RSSAXParserDelegate>
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@property (nonatomic) NSData *feedData;
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@property (nonatomic) NSString *urlString;
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@property (nonatomic) NSDictionary *currentAttributes;
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@property (nonatomic) RSSAXParser *parser;
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@property (nonatomic) NSMutableArray *articles;
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@property (nonatomic) BOOL parsingArticle;
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@property (nonatomic, readonly) RSParsedArticle *currentArticle;
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@property (nonatomic) BOOL parsingChannelImage;
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@property (nonatomic, readonly) NSDate *currentDate;
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@property (nonatomic) BOOL endRSSFound;
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@property (nonatomic) NSString *feedLink;
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@property (nonatomic) NSString *feedTitle;
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@property (nonatomic) NSString *feedSubtitle;
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@property (nonatomic) NSDate *dateParsed;
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@end
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@implementation RSRSSParser
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#pragma mark - Class Methods
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+ (BOOL)canParseFeed:(RSXMLData *)xmlData {
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// Checking for '<rss' and '<channel>' within first n characters should do it.
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// TODO: handle RSS 1.0
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@autoreleasepool {
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NSData *feedData = xmlData.data;
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NSString *s = [[NSString alloc] initWithBytesNoCopy:(void *)feedData.bytes length:feedData.length encoding:NSUTF8StringEncoding freeWhenDone:NO];
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if (!s) {
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s = [[NSString alloc] initWithData:feedData encoding:NSUTF8StringEncoding];
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}
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if (!s) {
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s = [[NSString alloc] initWithData:feedData encoding:NSUnicodeStringEncoding];
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}
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if (!s) {
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return NO;
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}
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static const NSInteger numberOfCharactersToSearch = 4096;
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NSRange rangeToSearch = NSMakeRange(0, numberOfCharactersToSearch);
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if (s.length < numberOfCharactersToSearch) {
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rangeToSearch.length = s.length;
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}
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NSRange rssRange = [s rangeOfString:@"<rss" options:NSLiteralSearch range:rangeToSearch];
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NSRange channelRange = [s rangeOfString:@"<channel>" options:NSLiteralSearch range:rangeToSearch];
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if (rssRange.length < 1 || channelRange.length < 1) {
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return NO;
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}
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if (rssRange.location > channelRange.location) {
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return NO; // Wrong order.
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}
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}
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return YES;
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}
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#pragma mark - Init
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- (instancetype)initWithXMLData:(RSXMLData *)xmlData {
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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 = xmlData.data;
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_urlString = xmlData.urlString;
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_parser = [[RSSAXParser alloc] initWithDelegate:self];
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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.feedTitle link:self.feedLink articles:self.articles];
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parsedFeed.subtitle = self.feedSubtitle;
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return parsedFeed;
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}
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#pragma mark - Constants
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static NSString *kIsPermaLinkKey = @"isPermaLink";
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static NSString *kURLKey = @"url";
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static NSString *kLengthKey = @"length";
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static NSString *kTypeKey = @"type";
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static NSString *kFalseValue = @"false";
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static NSString *kTrueValue = @"true";
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static NSString *kContentEncodedKey = @"content:encoded";
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static NSString *kDCDateKey = @"dc:date";
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static NSString *kDCCreatorKey = @"dc:creator";
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static NSString *kRDFAboutKey = @"rdf:about";
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static const char *kItem = "item";
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static const NSInteger kItemLength = 5;
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@interface RSRSSParser () <RSSAXParserDelegate>
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@property (nonatomic) BOOL parsingArticle;
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@property (nonatomic) BOOL parsingChannelImage;
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@property (nonatomic) BOOL guidIsPermalink;
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@property (nonatomic) BOOL endRSSFound;
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@property (nonatomic) NSURL *baseURL;
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@end
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static const char *kImage = "image";
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static const NSInteger kImageLength = 6;
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// TODO: handle RSS 1.0
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@implementation RSRSSParser
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static const char *kLink = "link";
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static const NSInteger kLinkLength = 5;
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#pragma mark - RSXMLParserDelegate
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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 *kDC = "dc";
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static const NSInteger kDCLength = 3;
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static const char *kCreator = "creator";
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static const NSInteger kCreatorLength = 8;
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static const char *kDate = "date";
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static const NSInteger kDateLength = 5;
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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 *kEncoded = "encoded";
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static const NSInteger kEncodedLength = 8;
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static const char *kGuid = "guid";
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static const NSInteger kGuidLength = 5;
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static const char *kPubDate = "pubDate";
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static const NSInteger kPubDateLength = 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 *kDescription = "description";
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static const NSInteger kDescriptionLength = 12;
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static const char *kRSS = "rss";
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static const NSInteger kRSSLength = 4;
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static const char *kURL = "url";
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static const NSInteger kURLLength = 4;
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static const char *kLength = "length";
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static const NSInteger kLengthLength = 7;
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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 *kIsPermaLink = "isPermaLink";
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static const NSInteger kIsPermaLinkLength = 12;
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static const char *kRDF = "rdf";
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static const NSInteger kRDFlength = 4;
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static const char *kAbout = "about";
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static const NSInteger kAboutLength = 6;
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static const char *kFalse = "false";
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static const NSInteger kFalseLength = 6;
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static const char *kTrue = "true";
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static const NSInteger kTrueLength = 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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+ (NSArray<const NSString *> *)parserRequireOrderedTags {
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return @[@"<rss", @"<channel>"];
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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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- (void)addFeedElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix {
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if (prefix != NULL) {
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return;
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}
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if (RSSAXEqualTags(localName, kLink, kLinkLength)) {
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if (!self.feedLink) {
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self.feedLink = self.parser.currentStringWithTrimmedWhitespace;
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}
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}
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else if (RSSAXEqualTags(localName, kTitle, kTitleLength)) {
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self.feedTitle = self.parser.currentStringWithTrimmedWhitespace;
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}
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else if (RSSAXEqualTags(localName, kDescription, kDescriptionLength)) {
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self.feedSubtitle = self.parser.currentStringWithTrimmedWhitespace;
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}
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}
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- (void)addDCElement:(const xmlChar *)localName {
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if (RSSAXEqualTags(localName, kCreator, kCreatorLength)) {
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self.currentArticle.author = self.parser.currentStringWithTrimmedWhitespace;
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}
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else if (RSSAXEqualTags(localName, kDate, kDateLength)) {
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self.currentArticle.datePublished = self.currentDate;
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}
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}
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- (void)addGuid {
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self.currentArticle.guid = self.parser.currentStringWithTrimmedWhitespace;
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NSString *isPermaLinkValue = [self.currentAttributes rsxml_objectForCaseInsensitiveKey:@"ispermalink"];
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if (!isPermaLinkValue || ![isPermaLinkValue isEqualToString:@"false"]) {
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self.currentArticle.permalink = [self urlString:self.currentArticle.guid];
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}
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}
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- (NSString *)urlString:(NSString *)s {
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/*Resolve against home page URL (if available) or feed URL.*/
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if ([[s lowercaseString] hasPrefix:@"http"]) {
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return s;
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}
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if (!self.feedLink) {
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//TODO: get feed URL and use that to resolve URL.*/
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return s;
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}
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NSURL *baseURL = [NSURL URLWithString:self.feedLink];
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if (!baseURL) {
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return s;
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}
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NSURL *resolvedURL = [NSURL URLWithString:s relativeToURL:baseURL];
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if (resolvedURL.absoluteString) {
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return resolvedURL.absoluteString;
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}
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return s;
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}
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- (NSString *)currentStringWithHTMLEntitiesDecoded {
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return [self.parser.currentStringWithTrimmedWhitespace rs_stringByDecodingHTMLEntities];
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}
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- (void)addArticleElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix {
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if (RSSAXEqualTags(prefix, kDC, kDCLength)) {
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[self addDCElement:localName];
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return;
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}
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if (RSSAXEqualTags(prefix, kContent, kContentLength) && RSSAXEqualTags(localName, kEncoded, kEncodedLength)) {
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self.currentArticle.body = [self currentStringWithHTMLEntitiesDecoded];
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return;
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}
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if (prefix != NULL) {
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return;
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}
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if (RSSAXEqualTags(localName, kGuid, kGuidLength)) {
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[self addGuid];
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}
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else if (RSSAXEqualTags(localName, kPubDate, kPubDateLength)) {
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self.currentArticle.datePublished = self.currentDate;
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}
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else if (RSSAXEqualTags(localName, kAuthor, kAuthorLength)) {
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self.currentArticle.author = self.parser.currentStringWithTrimmedWhitespace;
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}
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else if (RSSAXEqualTags(localName, kLink, kLinkLength)) {
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self.currentArticle.link = [self urlString:self.parser.currentStringWithTrimmedWhitespace];
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}
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else if (RSSAXEqualTags(localName, kDescription, kDescriptionLength)) {
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self.currentArticle.abstract = [self currentStringWithHTMLEntitiesDecoded];
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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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}
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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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#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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@@ -354,31 +55,61 @@ static const NSInteger kTrueLength = 5;
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return;
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}
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NSDictionary *xmlAttributes = nil;
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if (RSSAXEqualTags(localName, kItem, kItemLength) || RSSAXEqualTags(localName, kGuid, kGuidLength)) {
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xmlAttributes = [self.parser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
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}
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if (self.currentAttributes != xmlAttributes) {
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self.currentAttributes = xmlAttributes;
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}
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int len = xmlStrlen(localName);
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if (!prefix && RSSAXEqualTags(localName, kItem, kItemLength)) {
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[self addArticle];
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self.parsingArticle = YES;
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if (xmlAttributes && xmlAttributes[kRDFAboutKey]) { /*RSS 1.0 guid*/
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self.currentArticle.guid = xmlAttributes[kRDFAboutKey];
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self.currentArticle.permalink = self.currentArticle.guid;
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if (prefix != NULL) {
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if (!self.parsingArticle || self.parsingChannelImage) {
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return;
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}
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if (len != 4 && len != 7) {
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return;
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}
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int prefLen = xmlStrlen(prefix);
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if (prefLen == 2 && EqualBytes(prefix, "dc", 2)) {
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if (EqualBytes(localName, "date", 4) || EqualBytes(localName, "creator", 7)) {
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[SAXParser beginStoringCharacters];
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}
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}
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else if (len == 7 && prefLen == 7 && EqualBytes(prefix, "content", 7) && EqualBytes(localName, "encoded", 7)) {
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[SAXParser beginStoringCharacters];
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}
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return;
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}
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// else: localname without prefix
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switch (len) {
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case 4:
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if (EqualBytes(localName, "item", 4)) {
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self.parsingArticle = YES;
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self.currentArticle = [self.parsedFeed appendNewArticle];
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NSDictionary *attribs = [SAXParser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
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if (attribs) {
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NSString *about = attribs[kRDFAboutKey]; // RSS 1.0 guid
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if (about) {
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self.currentArticle.guid = about;
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self.currentArticle.permalink = about;
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}
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}
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}
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else if (EqualBytes(localName, "guid", 4)) {
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NSDictionary *attribs = [SAXParser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
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NSString *isPermaLinkValue = [attribs rsxml_objectForCaseInsensitiveKey:@"isPermaLink"];
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if (!isPermaLinkValue || ![isPermaLinkValue isEqualToString:@"false"]) {
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self.guidIsPermalink = YES;
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} else {
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self.guidIsPermalink = NO;
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}
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}
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break;
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case 5:
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if (EqualBytes(localName, "image", 5)) {
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self.parsingChannelImage = YES;
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}
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break;
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}
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else if (!prefix && RSSAXEqualTags(localName, kImage, kImageLength)) {
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self.parsingChannelImage = YES;
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}
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if (!self.parsingChannelImage) {
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[self.parser beginStoringCharacters];
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if (self.parsingArticle || !self.parsingChannelImage) {
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[SAXParser beginStoringCharacters];
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}
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}
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@@ -388,77 +119,132 @@ static const NSInteger kTrueLength = 5;
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if (self.endRSSFound) {
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return;
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}
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int len = xmlStrlen(localName);
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if (RSSAXEqualTags(localName, kRSS, kRSSLength)) {
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self.endRSSFound = YES;
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// Meta parsing
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if (len == 3 && EqualBytes(localName, "rss", 3)) { self.endRSSFound = YES; }
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else if (len == 4 && EqualBytes(localName, "item", 4)) { self.parsingArticle = NO; }
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else if (len == 5 && EqualBytes(localName, "image", 5)) { self.parsingChannelImage = NO; }
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// Always exit if prefix is set
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else if (prefix != NULL)
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{
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if (!self.parsingArticle) {
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// Feed parsing
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return;
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}
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int prefLen = xmlStrlen(prefix);
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// Article parsing
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switch (len) {
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case 4:
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if (prefLen == 2 && EqualBytes(prefix, "dc", 2) && EqualBytes(localName, "date", 4))
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self.currentArticle.datePublished = [self dateFromCharacters:SAXParser.currentCharacters];
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return;
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||||
case 7:
|
||||
if (prefLen == 2 && EqualBytes(prefix, "dc", 2) && EqualBytes(localName, "creator", 7)) {
|
||||
self.currentArticle.author = SAXParser.currentStringWithTrimmedWhitespace;
|
||||
}
|
||||
else if (prefLen == 7 && EqualBytes(prefix, "content", 7) && EqualBytes(localName, "encoded", 7)) {
|
||||
self.currentArticle.body = [self decodeHTMLEntities:SAXParser.currentStringWithTrimmedWhitespace];
|
||||
}
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
else if (RSSAXEqualTags(localName, kImage, kImageLength)) {
|
||||
self.parsingChannelImage = NO;
|
||||
// Article parsing
|
||||
else if (self.parsingArticle)
|
||||
{
|
||||
switch (len) {
|
||||
case 4:
|
||||
if (EqualBytes(localName, "link", 4)) {
|
||||
self.currentArticle.link = [SAXParser.currentStringWithTrimmedWhitespace absoluteURLWithBase:self.baseURL];
|
||||
}
|
||||
else if (EqualBytes(localName, "guid", 4)) {
|
||||
self.currentArticle.guid = SAXParser.currentStringWithTrimmedWhitespace;
|
||||
if (self.guidIsPermalink) {
|
||||
self.currentArticle.permalink = [self.currentArticle.guid absoluteURLWithBase:self.baseURL];
|
||||
}
|
||||
}
|
||||
return;
|
||||
case 5:
|
||||
if (EqualBytes(localName, "title", 5))
|
||||
self.currentArticle.title = [self decodeHTMLEntities:SAXParser.currentStringWithTrimmedWhitespace];
|
||||
return;
|
||||
case 6:
|
||||
if (EqualBytes(localName, "author", 6))
|
||||
self.currentArticle.author = SAXParser.currentStringWithTrimmedWhitespace;
|
||||
return;
|
||||
case 7:
|
||||
if (EqualBytes(localName, "pubDate", 7))
|
||||
self.currentArticle.datePublished = [self dateFromCharacters:SAXParser.currentCharacters];
|
||||
return;
|
||||
case 11:
|
||||
if (EqualBytes(localName, "description", 11))
|
||||
self.currentArticle.abstract = [self decodeHTMLEntities:SAXParser.currentStringWithTrimmedWhitespace];
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
else if (RSSAXEqualTags(localName, kItem, kItemLength)) {
|
||||
self.parsingArticle = NO;
|
||||
}
|
||||
|
||||
else if (self.parsingArticle) {
|
||||
[self addArticleElement:localName prefix:prefix];
|
||||
}
|
||||
|
||||
else if (!self.parsingChannelImage) {
|
||||
[self addFeedElement:localName prefix:prefix];
|
||||
// Feed parsing
|
||||
else if (!self.parsingChannelImage)
|
||||
{
|
||||
switch (len) {
|
||||
case 4:
|
||||
if (EqualBytes(localName, "link", 4)) {
|
||||
self.parsedFeed.link = SAXParser.currentStringWithTrimmedWhitespace;
|
||||
self.baseURL = [NSURL URLWithString:self.parsedFeed.link];
|
||||
}
|
||||
return;
|
||||
case 5:
|
||||
if (EqualBytes(localName, "title", 5))
|
||||
self.parsedFeed.title = SAXParser.currentStringWithTrimmedWhitespace;
|
||||
return;
|
||||
case 11:
|
||||
if (EqualBytes(localName, "description", 11))
|
||||
self.parsedFeed.subtitle = SAXParser.currentStringWithTrimmedWhitespace;
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForName:(const xmlChar *)name prefix:(const xmlChar *)prefix {
|
||||
|
||||
if (RSSAXEqualTags(prefix, kRDF, kRDFlength)) {
|
||||
|
||||
if (RSSAXEqualTags(name, kAbout, kAboutLength)) {
|
||||
return kRDFAboutKey;
|
||||
}
|
||||
|
||||
return nil;
|
||||
}
|
||||
int len = xmlStrlen(name);
|
||||
|
||||
if (prefix) {
|
||||
if (len == 5 && EqualBytes(prefix, "rdf", 4) && EqualBytes(name, "about", 5)) { // 4 because prefix length is not checked
|
||||
return kRDFAboutKey;
|
||||
}
|
||||
return nil;
|
||||
}
|
||||
|
||||
if (RSSAXEqualTags(name, kIsPermaLink, kIsPermaLinkLength)) {
|
||||
return kIsPermaLinkKey;
|
||||
switch (len) {
|
||||
case 3:
|
||||
if (EqualBytes(name, "url", 3)) { return @"url"; }
|
||||
break;
|
||||
case 4:
|
||||
if (EqualBytes(name, "type", 4)) { return @"type"; }
|
||||
break;
|
||||
case 6:
|
||||
if (EqualBytes(name, "length", 6)) { return @"length"; }
|
||||
break;
|
||||
case 11:
|
||||
if (EqualBytes(name, "isPermaLink", 11)) { return @"isPermaLink"; }
|
||||
break;
|
||||
}
|
||||
|
||||
if (RSSAXEqualTags(name, kURL, kURLLength)) {
|
||||
return kURLKey;
|
||||
}
|
||||
|
||||
if (RSSAXEqualTags(name, kLength, kLengthLength)) {
|
||||
return kLengthKey;
|
||||
}
|
||||
|
||||
if (RSSAXEqualTags(name, kType, kTypeLength)) {
|
||||
return kTypeKey;
|
||||
}
|
||||
|
||||
return nil;
|
||||
}
|
||||
|
||||
|
||||
- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForValue:(const void *)bytes length:(NSUInteger)length {
|
||||
|
||||
static const NSUInteger falseLength = kFalseLength - 1;
|
||||
static const NSUInteger trueLength = kTrueLength - 1;
|
||||
|
||||
if (length == falseLength && RSSAXEqualBytes(bytes, kFalse, falseLength)) {
|
||||
return kFalseValue;
|
||||
switch (length) {
|
||||
case 4:
|
||||
if (EqualBytes(bytes, "true", 4)) { return @"true"; }
|
||||
break;
|
||||
case 5:
|
||||
if (EqualBytes(bytes, "false", 5)) { return @"false"; }
|
||||
break;
|
||||
}
|
||||
|
||||
if (length == trueLength && RSSAXEqualBytes(bytes, kTrue, trueLength)) {
|
||||
return kTrueValue;
|
||||
}
|
||||
|
||||
return nil;
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user