255 lines
8.0 KiB
Objective-C
Executable File
255 lines
8.0 KiB
Objective-C
Executable File
//
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// MIT License (MIT)
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//
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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 "RSParsedFeed.h"
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#import "RSParsedArticle.h"
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#import "NSString+RSXML.h"
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#import "NSDictionary+RSXML.h"
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static NSString *kRDFAboutKey = @"rdf:about";
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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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// TODO: handle RSS 1.0
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@implementation RSRSSParser
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#pragma mark - RSXMLParserDelegate
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+ (NSArray<const NSString *> *)parserRequireOrderedTags {
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return @[@"<rss", @"<channel>"];
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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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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 (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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if (self.parsingArticle || !self.parsingChannelImage) {
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[SAXParser beginStoringCharacters];
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}
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}
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- (void)saxParser:(RSSAXParser *)SAXParser XMLEndElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri {
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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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// 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:
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if (prefLen == 2 && EqualBytes(prefix, "dc", 2) && EqualBytes(localName, "creator", 7)) {
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self.currentArticle.author = SAXParser.currentStringWithTrimmedWhitespace;
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}
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else if (prefLen == 7 && EqualBytes(prefix, "content", 7) && EqualBytes(localName, "encoded", 7)) {
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self.currentArticle.body = [self decodeHTMLEntities:SAXParser.currentStringWithTrimmedWhitespace];
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}
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return;
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}
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}
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// Article parsing
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else if (self.parsingArticle)
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{
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switch (len) {
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case 4:
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if (EqualBytes(localName, "link", 4)) {
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self.currentArticle.link = [SAXParser.currentStringWithTrimmedWhitespace absoluteURLWithBase:self.baseURL];
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}
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else if (EqualBytes(localName, "guid", 4)) {
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self.currentArticle.guid = SAXParser.currentStringWithTrimmedWhitespace;
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if (self.guidIsPermalink) {
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self.currentArticle.permalink = [self.currentArticle.guid absoluteURLWithBase:self.baseURL];
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}
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}
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return;
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case 5:
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if (EqualBytes(localName, "title", 5))
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self.currentArticle.title = [self decodeHTMLEntities:SAXParser.currentStringWithTrimmedWhitespace];
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return;
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case 6:
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if (EqualBytes(localName, "author", 6))
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self.currentArticle.author = SAXParser.currentStringWithTrimmedWhitespace;
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return;
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case 7:
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if (EqualBytes(localName, "pubDate", 7))
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self.currentArticle.datePublished = [self dateFromCharacters:SAXParser.currentCharacters];
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return;
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case 11:
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if (EqualBytes(localName, "description", 11))
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self.currentArticle.abstract = [self decodeHTMLEntities:SAXParser.currentStringWithTrimmedWhitespace];
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return;
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}
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}
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// Feed parsing
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else if (!self.parsingChannelImage)
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{
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switch (len) {
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case 4:
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if (EqualBytes(localName, "link", 4)) {
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self.parsedFeed.link = SAXParser.currentStringWithTrimmedWhitespace;
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self.baseURL = [NSURL URLWithString:self.parsedFeed.link];
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}
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return;
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case 5:
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if (EqualBytes(localName, "title", 5))
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self.parsedFeed.title = SAXParser.currentStringWithTrimmedWhitespace;
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return;
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case 11:
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if (EqualBytes(localName, "description", 11))
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self.parsedFeed.subtitle = SAXParser.currentStringWithTrimmedWhitespace;
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return;
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}
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}
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}
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- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForName:(const xmlChar *)name prefix:(const xmlChar *)prefix {
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int len = xmlStrlen(name);
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if (prefix) {
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if (len == 5 && EqualBytes(prefix, "rdf", 4) && EqualBytes(name, "about", 5)) { // 4 because prefix length is not checked
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return kRDFAboutKey;
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}
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return nil;
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}
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switch (len) {
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case 3:
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if (EqualBytes(name, "url", 3)) { return @"url"; }
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break;
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case 4:
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if (EqualBytes(name, "type", 4)) { return @"type"; }
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break;
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case 6:
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if (EqualBytes(name, "length", 6)) { return @"length"; }
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break;
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case 11:
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if (EqualBytes(name, "isPermaLink", 11)) { return @"isPermaLink"; }
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break;
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}
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return nil;
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}
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- (NSString *)saxParser:(RSSAXParser *)SAXParser internedStringForValue:(const void *)bytes length:(NSUInteger)length {
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switch (length) {
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case 4:
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if (EqualBytes(bytes, "true", 4)) { return @"true"; }
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break;
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case 5:
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if (EqualBytes(bytes, "false", 5)) { return @"false"; }
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break;
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}
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return nil;
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}
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@end
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