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YamlParser.m
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YamlParser.m
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//
// YamlParser.m
// Yaml
//
// Created by Kenji Nishishiro <marvel@programmershigh.org> on 10/05/08.
// Copyright 2010 Kenji Nishishiro. All rights reserved.
//
#import "YamlParser.h"
#import <yaml.h>
@implementation YamlParser
NSArray *parseSequence(yaml_parser_t *parser);
NSDictionary *parseMapping(yaml_parser_t *parser);
NSObject *parseValue(yaml_event_t *event);
+ (NSObject *)objectFromString:(NSString *)string {
yaml_parser_t parser;
yaml_parser_initialize(&parser);
const char *chars = [string UTF8String];
yaml_parser_set_input_string(&parser, (const unsigned char *)chars, strlen(chars));
while (YES) {
yaml_event_t event;
if (!yaml_parser_parse(&parser, &event)) {
yaml_parser_delete(&parser);
return nil;
}
switch (event.type) {
case YAML_SCALAR_EVENT:
;
NSObject *value = parseValue(&event);
yaml_event_delete(&event);
yaml_parser_delete(&parser);
return value;
case YAML_SEQUENCE_START_EVENT:
;
NSArray *sequenceValue = parseSequence(&parser);
yaml_event_delete(&event);
yaml_parser_delete(&parser);
return sequenceValue;
case YAML_MAPPING_START_EVENT:
;
NSDictionary *mappingValue = parseMapping(&parser);
yaml_event_delete(&event);
yaml_parser_delete(&parser);
return mappingValue;
case YAML_STREAM_END_EVENT:
yaml_event_delete(&event);
yaml_parser_delete(&parser);
return nil;
}
yaml_event_delete(&event);
}
}
NSArray *parseSequence(yaml_parser_t *parser) {
NSMutableArray *sequence = [NSMutableArray array];
while (YES) {
yaml_event_t event;
if (!yaml_parser_parse(parser, &event)) {
return nil;
}
switch (event.type) {
case YAML_SCALAR_EVENT:
;
NSObject *value = parseValue(&event);
[sequence addObject:value];
break;
case YAML_SEQUENCE_START_EVENT:
;
NSArray *sequenceValue = parseSequence(parser);
if (!sequenceValue) {
yaml_event_delete(&event);
return nil;
}
[sequence addObject:sequenceValue];
break;
case YAML_SEQUENCE_END_EVENT:
yaml_event_delete(&event);
return sequence;
case YAML_MAPPING_START_EVENT:
;
NSDictionary *mappingValue = parseMapping(parser);
if (!mappingValue) {
yaml_event_delete(&event);
return nil;
}
[sequence addObject:mappingValue];
break;
case YAML_STREAM_END_EVENT:
yaml_event_delete(&event);
return nil;
}
yaml_event_delete(&event);
}
}
NSDictionary *parseMapping(yaml_parser_t *parser) {
NSMutableDictionary *mapping = [NSMutableDictionary dictionary];
NSString *key = nil;
while (YES) {
yaml_event_t event;
if (!yaml_parser_parse(parser, &event)) {
return nil;
}
switch (event.type) {
case YAML_SCALAR_EVENT:
;
NSObject *value = parseValue(&event);
if (!key) {
key = [value description];
}
else {
[mapping setValue:value forKey:key];
key = nil;
}
break;
case YAML_SEQUENCE_START_EVENT:
;
NSArray *sequenceValue = parseSequence(parser);
if (!sequenceValue) {
yaml_event_delete(&event);
return nil;
}
if (key) {
[mapping setValue:sequenceValue forKey:key];
key = nil;
}
break;
case YAML_MAPPING_START_EVENT:
;
NSDictionary *mappingValue = parseMapping(parser);
if (!mappingValue) {
yaml_event_delete(&event);
return nil;
}
if (key) {
[mapping setValue:mappingValue forKey:key];
key = nil;
}
break;
case YAML_MAPPING_END_EVENT:
yaml_event_delete(&event);
return mapping;
case YAML_STREAM_END_EVENT:
yaml_event_delete(&event);
return nil;
}
yaml_event_delete(&event);
}
}
NSObject *parseValue(yaml_event_t *event) {
NSString *value = [[[NSString alloc] initWithBytes:event->data.scalar.value length:event->data.scalar.length encoding:NSUTF8StringEncoding] autorelease];
if (event->data.scalar.quoted_implicit) {
return value;
}
else {
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
id result;
if ([dateFormatter getObjectValue:&result forString:value errorDescription:nil]) {
return result;
}
NSNumberFormatter *numberFormatter = [[[NSNumberFormatter alloc] init] autorelease];
if ([numberFormatter getObjectValue:&result forString:value errorDescription:nil]) {
return result;
}
// TODO: Add other type conversions.
return value;
}
}
@end