Refactoring to v.2.0
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relikd
@@ -1,172 +1,76 @@
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//
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// RSOPMLParser.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 7/12/15.
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// Copyright © 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 "RSOPMLParser.h"
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#import <libxml/xmlstring.h>
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#import "RSXMLData.h"
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#import "RSSAXParser.h"
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#import "RSOPMLItem.h"
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#import "RSXMLError.h"
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void RSParseOPML(RSXMLData *xmlData, RSParsedOPMLBlock callback) {
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NSCParameterAssert(xmlData);
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NSCParameterAssert(callback);
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dispatch_async(dispatch_get_global_queue(QOS_CLASS_DEFAULT, 0), ^{
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@autoreleasepool {
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RSOPMLParser *parser = [[RSOPMLParser alloc] initWithXMLData:xmlData];
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RSOPMLItem *document = parser.opmlDocument;
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NSError *error = parser.error;
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dispatch_async(dispatch_get_main_queue(), ^{
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callback(document, error);
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});
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}
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});
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}
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@interface RSOPMLParser () <RSSAXParserDelegate>
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@property (nonatomic, readwrite) RSOPMLItem *opmlDocument;
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@property (nonatomic, readwrite) NSError *error;
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@interface RSOPMLParser()
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@property (nonatomic, assign) BOOL parsingHead;
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@property (nonatomic) RSOPMLItem *opmlDocument;
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@property (nonatomic) NSMutableArray<RSOPMLItem*> *itemStack;
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@end
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@implementation RSOPMLParser
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#pragma mark - RSXMLParserDelegate
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#pragma mark - Init
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+ (BOOL)isOPMLParser { return YES; }
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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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[self parse:XMLData];
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return self;
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+ (NSArray<const NSString*>*)parserRequireOrderedTags {
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return @[@"<opml", @"<outline"];
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}
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#pragma mark - Private
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- (void)parse:(RSXMLData *)XMLData {
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@autoreleasepool {
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if ([self canParseData:XMLData.data]) {
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RSSAXParser *parser = [[RSSAXParser alloc] initWithDelegate:self];
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self.itemStack = [NSMutableArray new];
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self.opmlDocument = [RSOPMLItem new];
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[self.itemStack addObject:self.opmlDocument];
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[parser parseData:XMLData.data];
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[parser finishParsing];
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} else {
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NSString *filename = nil;
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NSURL *url = [NSURL URLWithString:XMLData.urlString];
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if (url && url.isFileURL) {
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filename = url.path.lastPathComponent;
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}
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if (!filename) {
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filename = XMLData.urlString;
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}
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self.error = RSXMLMakeError(RSXMLErrorFileNotOPML, filename);
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}
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}
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}
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- (BOOL)canParseData:(NSData *)d {
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// Check for <opml and <outline near the top.
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@autoreleasepool {
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NSString *s = [[NSString alloc] initWithBytesNoCopy:(void *)d.bytes length:d.length encoding:NSUTF8StringEncoding freeWhenDone:NO];
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if (!s) {
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NSDictionary *options = @{NSStringEncodingDetectionSuggestedEncodingsKey : @[@(NSUTF8StringEncoding)]};
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(void)[NSString stringEncodingForData:d encodingOptions:options convertedString:&s usedLossyConversion:nil];
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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 opmlRange = [s rangeOfString:@"<opml" options:NSCaseInsensitiveSearch range:rangeToSearch];
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if (opmlRange.location == NSNotFound) {
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return NO;
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}
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NSRange outlineRange = [s rangeOfString:@"<outline" options:NSLiteralSearch range:rangeToSearch];
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if (outlineRange.location == NSNotFound) {
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return NO;
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}
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if (outlineRange.location < opmlRange.location) {
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return NO;
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}
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}
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- (BOOL)xmlParserWillStartParsing {
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self.opmlDocument = [RSOPMLItem new];
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self.itemStack = [NSMutableArray arrayWithObject:self.opmlDocument];
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return YES;
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}
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- (void)popItem {
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NSAssert(self.itemStack.count > 0, nil);
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/*If itemStack is empty, bad things are happening.
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But we still shouldn't crash in production.*/
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if (self.itemStack.count > 0) {
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[self.itemStack removeLastObject];
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}
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- (id)xmlParserWillReturnDocument {
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return self.opmlDocument;
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}
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#pragma mark - RSSAXParserDelegate
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static const char *kOutline = "outline";
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static const char kOutlineLength = 8;
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static const char *kHead = "head";
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static const char kHeadLength = 5;
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static BOOL isHead = NO;
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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 (RSSAXEqualTags(localName, kOutline, kOutlineLength)) {
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int len = xmlStrlen(localName);
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if (len == 7 && EqualBytes(localName, "outline", 7)) {
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RSOPMLItem *item = [RSOPMLItem new];
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item.attributes = [SAXParser attributesDictionary:attributes numberOfAttributes:numberOfAttributes];
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[self.itemStack.lastObject addChild:item];
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[self.itemStack addObject:item];
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} else if (RSSAXEqualTags(localName, kHead, kHeadLength)) {
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isHead = YES;
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} else if (isHead) {
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}
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else if (len == 4 && EqualBytes(localName, "head", 4)) {
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self.parsingHead = YES;
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}
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else if (self.parsingHead) {
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[SAXParser beginStoringCharacters];
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}
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}
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@@ -174,13 +78,17 @@ static BOOL isHead = NO;
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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 (RSSAXEqualTags(localName, kOutline, kOutlineLength)) {
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[self popItem];
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} else if (RSSAXEqualTags(localName, kHead, kHeadLength)) {
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isHead = NO;
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} else if (isHead) {
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int len = xmlStrlen(localName);
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if (len == 7 && EqualBytes(localName, "outline", 7)) {
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[self.itemStack removeLastObject]; // safe to be called on empty array
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}
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else if (len == 4 && EqualBytes(localName, "head", 4)) {
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self.parsingHead = NO;
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}
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else if (self.parsingHead) { // handle xml tags in head as if they were attributes
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NSString *key = [NSString stringWithFormat:@"%s", localName];
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[self.itemStack.lastObject setAttribute:[SAXParser currentString] forKey:key];
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[self.itemStack.lastObject setAttribute:SAXParser.currentStringWithTrimmedWhitespace forKey:key];
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}
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}
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@@ -191,24 +99,24 @@ static BOOL isHead = NO;
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return nil;
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}
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size_t nameLength = strlen((const char *)name);
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switch (nameLength) {
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int len = xmlStrlen(name);
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switch (len) {
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case 4:
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if (RSSAXEqualTags(name, "text", 5)) return OPMLTextKey;
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if (RSSAXEqualTags(name, "type", 5)) return OPMLTypeKey;
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if (EqualBytes(name, "text", 4)) return OPMLTextKey;
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if (EqualBytes(name, "type", 4)) return OPMLTypeKey;
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break;
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case 5:
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if (RSSAXEqualTags(name, "title", 6)) return OPMLTitleKey;
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if (EqualBytes(name, "title", 5)) return OPMLTitleKey;
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break;
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case 6:
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if (RSSAXEqualTags(name, "xmlUrl", 7)) return OPMLXMLURLKey;
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if (EqualBytes(name, "xmlUrl", 6)) return OPMLXMLURLKey;
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break;
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case 7:
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if (RSSAXEqualTags(name, "version", 8)) return OPMLVersionKey;
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if (RSSAXEqualTags(name, "htmlUrl", 8)) return OPMLHMTLURLKey;
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if (EqualBytes(name, "version", 7)) return OPMLVersionKey;
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if (EqualBytes(name, "htmlUrl", 7)) return OPMLHMTLURLKey;
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break;
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case 11:
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if (RSSAXEqualTags(name, "description", 12)) return OPMLDescriptionKey;
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if (EqualBytes(name, "description", 11)) return OPMLDescriptionKey;
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break;
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}
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return nil;
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@@ -220,11 +128,10 @@ static BOOL isHead = NO;
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if (length < 1) {
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return @"";
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} else if (length == 3) {
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if (RSSAXEqualBytes(bytes, "RSS", 3)) return @"RSS";
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if (RSSAXEqualBytes(bytes, "rss", 3)) return @"rss";
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if (EqualBytes(bytes, "RSS", 3)) return @"RSS";
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if (EqualBytes(bytes, "rss", 3)) return @"rss";
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}
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return nil;
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}
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@end
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