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| // | ||
| // CPJSONParser.h | ||
| // CoreParse | ||
| // | ||
| // Created by Tom Davie on 29/03/2011. | ||
| // Copyright 2011 In The Beginning... All rights reserved. | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
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| @interface CPJSONParser : NSObject | ||
| {} | ||
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| - (id<NSObject>)parse:(NSString *)json; | ||
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| @end |
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| // | ||
| // CPJSONParser.m | ||
| // CoreParse | ||
| // | ||
| // Created by Tom Davie on 29/03/2011. | ||
| // Copyright 2011 In The Beginning... All rights reserved. | ||
| // | ||
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| #import "CPJSONParser.h" | ||
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| #import "CPTokeniser.h" | ||
| #import "CPSLRParser.h" | ||
| #import "CPKeywordRecogniser.h" | ||
| #import "CPNumberRecogniser.h" | ||
| #import "CPWhiteSpaceRecogniser.h" | ||
| #import "CPQuotedRecogniser.h" | ||
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| #import "CPKeywordToken.h" | ||
| #import "CPNumberToken.h" | ||
| #import "CPQuotedToken.h" | ||
| #import "CPWhiteSpaceToken.h" | ||
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| @interface CPJSONParser () <CPParserDelegate, CPTokeniserDelegate> | ||
| @end | ||
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| @implementation CPJSONParser | ||
| { | ||
| CPTokeniser *jsonTokeniser; | ||
| CPParser *jsonParser; | ||
| } | ||
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| - (id)init | ||
| { | ||
| self = [super init]; | ||
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| if (nil != self) | ||
| { | ||
| jsonTokeniser = [[CPTokeniser alloc] init]; | ||
| CPQuotedRecogniser *stringRecogniser = [CPQuotedRecogniser quotedRecogniserWithStartQuote:@"\"" endQuote:@"\"" escapeSequence:@"\\" name:@"String"]; | ||
| [stringRecogniser setEscapeReplacer:^ NSString * (NSString *str, NSUInteger *loc) | ||
| { | ||
| if ([str length] > *loc) | ||
| { | ||
| switch ([str characterAtIndex:*loc]) | ||
| { | ||
| case 'b': | ||
| *loc = *loc + 1; | ||
| return @"\b"; | ||
| case 'f': | ||
| *loc = *loc + 1; | ||
| return @"\f"; | ||
| case 'n': | ||
| *loc = *loc + 1; | ||
| return @"\n"; | ||
| case 'r': | ||
| *loc = *loc + 1; | ||
| return @"\r"; | ||
| case 't': | ||
| *loc = *loc + 1; | ||
| return @"\t"; | ||
| default: | ||
| break; | ||
| } | ||
| } | ||
| return nil; | ||
| }]; | ||
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| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"{"]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"}"]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"["]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"]"]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@":"]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@","]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"true"]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"false"]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"null"]]; | ||
| [jsonTokeniser addTokenRecogniser:[CPNumberRecogniser numberRecogniser]]; | ||
| [jsonTokeniser addTokenRecogniser:stringRecogniser]; | ||
| [jsonTokeniser addTokenRecogniser:[CPWhiteSpaceRecogniser whiteSpaceRecogniser]]; | ||
| [jsonTokeniser setDelegate:self]; | ||
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| CPGrammar *jsonGrammar = [CPGrammar grammarWithStart:@"value" | ||
| backusNaurForm: | ||
| @"0 value ::= \"String\";" | ||
| @"1 value ::= \"Number\";" | ||
| @"2 value ::= <object>;" | ||
| @"3 value ::= <array>;" | ||
| @"4 value ::= <boolean>;" | ||
| @"5 value ::= \"null\";" | ||
| @"6 object ::= \"{\" \"}\";" | ||
| @"7 object ::= \"{\" <members> \"}\";" | ||
| @"8 members ::= <pair>;" | ||
| @"9 members ::= <pair> \",\" <members>;" | ||
| @"10 pair ::= \"String\" \":\" <value>;" | ||
| @"11 array ::= \"[\" \"]\";" | ||
| @"12 array ::= \"[\" <elements> \"]\";" | ||
| @"13 elements ::= <value>;" | ||
| @"14 elements ::= <value> \",\" <elements>;" | ||
| @"15 boolean ::= \"true\";" | ||
| @"16 boolean ::= \"false\";"]; | ||
| jsonParser = [[CPSLRParser parserWithGrammar:jsonGrammar] retain]; | ||
| [jsonParser setDelegate:self]; | ||
| } | ||
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| return self; | ||
| } | ||
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| - (void)dealloc | ||
| { | ||
| [jsonTokeniser release]; | ||
| [jsonParser release]; | ||
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| [super dealloc]; | ||
| } | ||
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| - (id<NSObject>)parse:(NSString *)json | ||
| { | ||
| CPTokenStream *tokenStream = [jsonTokeniser tokenise:json]; | ||
| return [jsonParser parse:tokenStream]; | ||
| } | ||
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| - (BOOL)tokeniser:(CPTokeniser *)tokeniser shouldConsumeToken:(CPToken *)token | ||
| { | ||
| return YES; | ||
| } | ||
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| - (NSArray *)tokeniser:(CPTokeniser *)tokeniser willProduceToken:(CPToken *)token | ||
| { | ||
| if ([token isKindOfClass:[CPWhiteSpaceToken class]]) | ||
| { | ||
| return [NSArray array]; | ||
| } | ||
| return [NSArray arrayWithObject:token]; | ||
| } | ||
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| - (id)parser:(CPParser *)parser didProduceSyntaxTree:(CPSyntaxTree *)syntaxTree | ||
| { | ||
| NSArray *children = [syntaxTree children]; | ||
| switch ([[syntaxTree rule] tag]) | ||
| { | ||
| case 0: | ||
| return [(CPQuotedToken *)[children objectAtIndex:0] content]; | ||
| case 1: | ||
| return [(CPNumberToken *)[children objectAtIndex:0] number]; | ||
| case 2: | ||
| case 3: | ||
| case 4: | ||
| return [children objectAtIndex:0]; | ||
| case 5: | ||
| return [NSNull null]; | ||
| case 6: | ||
| return [NSDictionary dictionary]; | ||
| case 7: | ||
| return [children objectAtIndex:1]; | ||
| case 8: | ||
| { | ||
| NSDictionary *p = [children objectAtIndex:0]; | ||
| return [NSMutableDictionary dictionaryWithObject:[p objectForKey:@"v"] forKey:[p objectForKey:@"k"]]; | ||
| } | ||
| case 9: | ||
| { | ||
| NSDictionary *p = [children objectAtIndex:0]; | ||
| NSMutableDictionary *ms = [children objectAtIndex:2]; | ||
| [ms setObject:[p objectForKey:@"v"] forKey:[p objectForKey:@"k"]]; | ||
| return ms; | ||
| } | ||
| case 10: | ||
| { | ||
| return [NSDictionary dictionaryWithObjectsAndKeys: | ||
| [(CPQuotedToken *)[children objectAtIndex:0] content], @"k", | ||
| [children objectAtIndex:2], @"v", | ||
| nil]; | ||
| } | ||
| case 11: | ||
| return [NSArray array]; | ||
| case 12: | ||
| return [children objectAtIndex:1]; | ||
| case 13: | ||
| return [NSMutableArray arrayWithObject:[children objectAtIndex:0]]; | ||
| case 14: | ||
| { | ||
| NSMutableArray *es = [children objectAtIndex:2]; | ||
| [es insertObject:[children objectAtIndex:0] atIndex:0]; | ||
| return es; | ||
| } | ||
| case 15: | ||
| return [NSNumber numberWithBool:YES]; | ||
| case 16: | ||
| return [NSNumber numberWithBool:NO]; | ||
| } | ||
| return nil; | ||
| } | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -33,3 +33,5 @@ | |
| #import "CPParser.h" | ||
| #import "CPSLRParser.h" | ||
| #import "CPLR1Parser.h" | ||
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| #import "CPJSONParser.h" | ||
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