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347 lines
8.8 KiB
Objective-C
Executable File
347 lines
8.8 KiB
Objective-C
Executable File
//
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// RSSAXParser.m
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// RSParser
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//
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// Created by Brent Simmons on 3/25/15.
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// Copyright (c) 2015 Ranchero Software, LLC. All rights reserved.
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//
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#import <libxml/tree.h>
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#import <libxml/xmlstring.h>
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#import "RSSAXParser.h"
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#import "RSParserInternal.h"
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@interface RSSAXParser ()
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@property (nonatomic, weak) id<RSSAXParserDelegate> delegate;
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@property (nonatomic, assign) xmlParserCtxtPtr context;
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@property (nonatomic, assign) BOOL storingCharacters;
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@property (nonatomic) NSMutableData *characters;
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@property (nonatomic) BOOL delegateRespondsToInternedStringMethod;
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@property (nonatomic) BOOL delegateRespondsToInternedStringForValueMethod;
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@property (nonatomic) BOOL delegateRespondsToStartElementMethod;
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@property (nonatomic) BOOL delegateRespondsToEndElementMethod;
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@property (nonatomic) BOOL delegateRespondsToCharactersFoundMethod;
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@property (nonatomic) BOOL delegateRespondsToEndOfDocumentMethod;
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@end
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@implementation RSSAXParser
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+ (void)initialize {
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RSSAXInitLibXMLParser();
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}
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#pragma mark - Init
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- (instancetype)initWithDelegate:(id<RSSAXParserDelegate>)delegate {
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self = [super init];
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if (self == nil)
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return nil;
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_delegate = delegate;
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if ([_delegate respondsToSelector:@selector(saxParser:internedStringForName:prefix:)]) {
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_delegateRespondsToInternedStringMethod = YES;
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}
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if ([_delegate respondsToSelector:@selector(saxParser:internedStringForValue:length:)]) {
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_delegateRespondsToInternedStringForValueMethod = YES;
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}
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if ([_delegate respondsToSelector:@selector(saxParser:XMLStartElement:prefix:uri:numberOfNamespaces:namespaces:numberOfAttributes:numberDefaulted:attributes:)]) {
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_delegateRespondsToStartElementMethod = YES;
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}
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if ([_delegate respondsToSelector:@selector(saxParser:XMLEndElement:prefix:uri:)]) {
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_delegateRespondsToEndElementMethod = YES;
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}
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if ([_delegate respondsToSelector:@selector(saxParser:XMLCharactersFound:length:)]) {
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_delegateRespondsToCharactersFoundMethod = YES;
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}
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if ([_delegate respondsToSelector:@selector(saxParserDidReachEndOfDocument:)]) {
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_delegateRespondsToEndOfDocumentMethod = YES;
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}
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return self;
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}
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#pragma mark - Dealloc
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- (void)dealloc {
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if (_context != nil) {
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xmlFreeParserCtxt(_context);
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_context = nil;
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}
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_delegate = nil;
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}
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#pragma mark - API
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static xmlSAXHandler saxHandlerStruct;
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- (void)parseData:(NSData *)data {
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[self parseBytes:data.bytes numberOfBytes:data.length];
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}
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- (void)parseBytes:(const void *)bytes numberOfBytes:(NSUInteger)numberOfBytes {
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if (self.context == nil) {
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self.context = xmlCreatePushParserCtxt(&saxHandlerStruct, (__bridge void *)self, nil, 0, nil);
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xmlCtxtUseOptions(self.context, XML_PARSE_RECOVER | XML_PARSE_NOENT);
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}
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@autoreleasepool {
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xmlParseChunk(self.context, (const char *)bytes, (int)numberOfBytes, 0);
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}
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}
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- (void)finishParsing {
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NSAssert(self.context != nil, nil);
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if (self.context == nil)
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return;
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@autoreleasepool {
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xmlParseChunk(self.context, nil, 0, 1);
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xmlFreeParserCtxt(self.context);
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self.context = nil;
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self.characters = nil;
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}
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}
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- (void)cancel {
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@autoreleasepool {
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xmlStopParser(self.context);
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}
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}
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- (void)beginStoringCharacters {
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self.storingCharacters = YES;
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self.characters = [NSMutableData new];
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}
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- (void)endStoringCharacters {
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self.storingCharacters = NO;
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self.characters = nil;
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}
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- (NSData *)currentCharacters {
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if (!self.storingCharacters) {
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return nil;
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}
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return self.characters;
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}
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- (NSString *)currentString {
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NSData *d = self.currentCharacters;
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if (RSParserObjectIsEmpty(d)) {
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return nil;
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}
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return [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
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}
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- (NSString *)currentStringWithTrimmedWhitespace {
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return [self.currentString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
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}
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#pragma mark - Attributes Dictionary
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- (NSDictionary *)attributesDictionary:(const xmlChar **)attributes numberOfAttributes:(NSInteger)numberOfAttributes {
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if (numberOfAttributes < 1 || !attributes) {
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return nil;
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}
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NSMutableDictionary *d = [NSMutableDictionary new];
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@autoreleasepool {
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NSInteger i = 0, j = 0;
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for (i = 0, j = 0; i < numberOfAttributes; i++, j+=5) {
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NSUInteger lenValue = (NSUInteger)(attributes[j + 4] - attributes[j + 3]);
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NSString *value = nil;
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if (self.delegateRespondsToInternedStringForValueMethod) {
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value = [self.delegate saxParser:self internedStringForValue:(const void *)attributes[j + 3] length:lenValue];
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}
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if (!value) {
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value = [[NSString alloc] initWithBytes:(const void *)attributes[j + 3] length:lenValue encoding:NSUTF8StringEncoding];
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}
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NSString *attributeName = nil;
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if (self.delegateRespondsToInternedStringMethod) {
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attributeName = [self.delegate saxParser:self internedStringForName:(const xmlChar *)attributes[j] prefix:(const xmlChar *)attributes[j + 1]];
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}
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if (!attributeName) {
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attributeName = [NSString stringWithUTF8String:(const char *)attributes[j]];
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if (attributes[j + 1]) {
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NSString *attributePrefix = [NSString stringWithUTF8String:(const char *)attributes[j + 1]];
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attributeName = [NSString stringWithFormat:@"%@:%@", attributePrefix, attributeName];
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}
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}
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if (value && attributeName) {
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d[attributeName] = value;
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}
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}
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}
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return d;
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}
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#pragma mark - Equal Tags
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BOOL RSSAXEqualTags(const xmlChar *localName, const char *tag, NSInteger tagLength) {
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if (!localName) {
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return NO;
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}
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return !strncmp((const char *)localName, tag, (size_t)tagLength);
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}
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#pragma mark - Callbacks
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- (void)xmlEndDocument {
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@autoreleasepool {
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if (self.delegateRespondsToEndOfDocumentMethod) {
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[self.delegate saxParserDidReachEndOfDocument:self];
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}
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[self endStoringCharacters];
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}
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}
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- (void)xmlCharactersFound:(const xmlChar *)ch length:(NSUInteger)length {
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@autoreleasepool {
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if (self.storingCharacters) {
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[self.characters appendBytes:(const void *)ch length:length];
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}
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if (self.delegateRespondsToCharactersFoundMethod) {
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[self.delegate saxParser:self XMLCharactersFound:ch length:length];
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}
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}
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}
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- (void)xmlStartElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri numberOfNamespaces:(int)numberOfNamespaces namespaces:(const xmlChar **)namespaces numberOfAttributes:(int)numberOfAttributes numberDefaulted:(int)numberDefaulted attributes:(const xmlChar **)attributes {
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@autoreleasepool {
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if (self.delegateRespondsToStartElementMethod) {
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[self.delegate saxParser:self XMLStartElement:localName prefix:prefix uri:uri numberOfNamespaces:numberOfNamespaces namespaces:namespaces numberOfAttributes:numberOfAttributes numberDefaulted:numberDefaulted attributes:attributes];
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}
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}
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}
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- (void)xmlEndElement:(const xmlChar *)localName prefix:(const xmlChar *)prefix uri:(const xmlChar *)uri {
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@autoreleasepool {
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if (self.delegateRespondsToEndElementMethod) {
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[self.delegate saxParser:self XMLEndElement:localName prefix:prefix uri:uri];
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}
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[self endStoringCharacters];
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}
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}
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@end
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static void startElementSAX(void *context, const xmlChar *localname, const xmlChar *prefix, const xmlChar *URI, int nb_namespaces, const xmlChar **namespaces, int nb_attributes, int nb_defaulted, const xmlChar **attributes) {
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[(__bridge RSSAXParser *)context xmlStartElement:localname prefix:prefix uri:URI numberOfNamespaces:nb_namespaces namespaces:namespaces numberOfAttributes:nb_attributes numberDefaulted:nb_defaulted attributes:attributes];
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}
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static void endElementSAX(void *context, const xmlChar *localname, const xmlChar *prefix, const xmlChar *URI) {
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[(__bridge RSSAXParser *)context xmlEndElement:localname prefix:prefix uri:URI];
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}
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static void charactersFoundSAX(void *context, const xmlChar *ch, int len) {
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[(__bridge RSSAXParser *)context xmlCharactersFound:ch length:(NSUInteger)len];
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}
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static void endDocumentSAX(void *context) {
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[(__bridge RSSAXParser *)context xmlEndDocument];
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}
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static xmlSAXHandler saxHandlerStruct = {
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nil, /* internalSubset */
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nil, /* isStandalone */
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nil, /* hasInternalSubset */
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nil, /* hasExternalSubset */
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nil, /* resolveEntity */
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nil, /* getEntity */
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nil, /* entityDecl */
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nil, /* notationDecl */
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nil, /* attributeDecl */
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nil, /* elementDecl */
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nil, /* unparsedEntityDecl */
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nil, /* setDocumentLocator */
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nil, /* startDocument */
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endDocumentSAX, /* endDocument */
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nil, /* startElement*/
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nil, /* endElement */
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nil, /* reference */
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charactersFoundSAX, /* characters */
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nil, /* ignorableWhitespace */
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nil, /* processingInstruction */
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nil, /* comment */
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nil, /* warning */
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nil, /* error */
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nil, /* fatalError //: unused error() get all the errors */
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nil, /* getParameterEntity */
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nil, /* cdataBlock */
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nil, /* externalSubset */
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XML_SAX2_MAGIC,
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nil,
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startElementSAX, /* startElementNs */
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endElementSAX, /* endElementNs */
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nil /* serror */
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};
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void RSSAXInitLibXMLParser(void) {
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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xmlInitParser();
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});
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}
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