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CPGrammar.m
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CPGrammar.m
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//
// Grammar.m
// CoreParse
//
// Created by Tom Davie on 13/02/2011.
// Copyright 2011 In The Beginning... All rights reserved.
//
#import "CPGrammar.h"
#import "CPGrammarPrivate.h"
#import "CPGrammarInternal.h"
#import "CPTokeniser.h"
#import "CPTokenStream.h"
#import "CPKeywordRecogniser.h"
#import "CPNumberRecogniser.h"
#import "CPWhitespaceRecogniser.h"
#import "CPWhiteSpaceToken.h"
#import "CPQuotedRecogniser.h"
#import "CPIdentifierRecogniser.h"
#import "CPLALR1Parser.h"
#import "CPIdentifierToken.h"
#import "CPQuotedToken.h"
#import "CPNumberToken.h"
#import "CPItem.h"
#import "CPLR1Item.h"
#import "CPRHSItem.h"
#import "CPRHSItem+Private.h"
#import "NSSetFunctional.h"
#import <objc/runtime.h>
@interface CPBNFParserDelegate : NSObject <CPTokeniserDelegate,CPParserDelegate>
@property (readwrite, retain, nonatomic) NSError *err;
@end
@implementation CPBNFParserDelegate
@synthesize err = _err;
- (id)parser:(CPParser *)parser didProduceSyntaxTree:(CPSyntaxTree *)syntaxTree
{
NSArray *children = [syntaxTree children];
switch ([[syntaxTree rule] tag])
{
case 0:
{
NSMutableArray *rules = (NSMutableArray *)[children objectAtIndex:0];
[rules addObjectsFromArray:[children objectAtIndex:1]];
return rules;
}
case 1:
return [NSMutableArray arrayWithArray:[children objectAtIndex:0]];
case 2:
{
NSArray *rules = [children objectAtIndex:1];
for (CPRule *r in rules)
{
[r setTag:[[(CPNumberToken *)[children objectAtIndex:0] number] intValue]];
}
return rules;
}
case 3:
return [children objectAtIndex:0];
case 4:
{
NSArray *arrs = [children objectAtIndex:2];
NSMutableArray *rules = [NSMutableArray arrayWithCapacity:[arrs count]];
for (NSArray *rhs in arrs)
{
NSString *name = [(CPIdentifierToken *)[children objectAtIndex:0] identifier];
Class c = NSClassFromString(name);
CPRule *rule = nil == c || ![c conformsToProtocol:@protocol(CPParseResult)] ? [CPRule ruleWithName:name rightHandSideElements:rhs] : [CPRule ruleWithName:name rightHandSideElements:rhs representitiveClass:c];
[rules addObject:rule];
}
return rules;
}
case 5:
{
NSMutableArray *rhs = [children objectAtIndex:0];
[rhs addObject:[children objectAtIndex:2]];
return rhs;
}
case 6:
{
NSMutableArray *rhs = [children objectAtIndex:0];
[rhs addObject:[NSArray array]];
return rhs;
}
case 7:
return [NSMutableArray arrayWithObject:[children objectAtIndex:0]];
case 8:
{
NSMutableArray *elements = (NSMutableArray *)[children objectAtIndex:0];
[elements addObject:[children objectAtIndex:1]];
return elements;
}
case 9:
return [NSMutableArray arrayWithObject:[children objectAtIndex:0]];
case 10:
return [children objectAtIndex:0];
case 11:
{
id i = [children objectAtIndex:2];
if ([i isRHSItem])
{
[(CPRHSItem *)i addTag:[[children objectAtIndex:0] identifier]];
return i;
}
else
{
CPRHSItem *newI = [[[CPRHSItem alloc] init] autorelease];
[newI setAlternatives:[NSArray arrayWithObject:[NSArray arrayWithObject:i]]];
[newI setRepeats:NO];
[newI setMayNotExist:NO];
[newI addTag:[[children objectAtIndex:0] identifier]];
[newI setShouldCollapse:YES];
return newI;
}
}
case 12:
return [children objectAtIndex:0];
case 13:
{
CPRHSItem *i = [[[CPRHSItem alloc] init] autorelease];
[i setAlternatives:[NSArray arrayWithObject:[NSArray arrayWithObject:[children objectAtIndex:0]]]];
NSString *symbol = [(CPKeywordToken *)[children objectAtIndex:1] keyword];
if ([symbol isEqualToString:@"*"])
{
[i setRepeats:YES];
[i setMayNotExist:YES];
}
else if ([symbol isEqualToString:@"+"])
{
[i setRepeats:YES];
[i setMayNotExist:NO];
}
else
{
[i setRepeats:NO];
[i setMayNotExist:YES];
}
return i;
}
case 14:
return [children objectAtIndex:0];
case 15:
{
CPRHSItem *i = [[[CPRHSItem alloc] init] autorelease];
[i setAlternatives:[children objectAtIndex:1]];
[i setRepeats:NO];
[i setMayNotExist:NO];
return i;
}
case 16:
case 17:
case 18:
case 19:
case 20:
return [children objectAtIndex:0];
return [children objectAtIndex:0];
case 21:
return [CPGrammarSymbol nonTerminalWithName:[(CPIdentifierToken *)[children objectAtIndex:1] identifier]];
case 22:
return [CPGrammarSymbol terminalWithName:[(CPQuotedToken *)[children objectAtIndex:0] content]];
default:
return syntaxTree;
}
}
- (CPRecoveryAction *)parser:(CPParser *)parser didEncounterErrorOnInput:(CPTokenStream *)inputStream expecting:(NSSet *)acceptableTokens
{
CPToken *t = [inputStream peekToken];
[self setErr:[NSError errorWithDomain:CPEBNFParserErrorDomain
code:CPErrorCodeCouldNotParseEBNF
userInfo:[NSDictionary dictionaryWithObjectsAndKeys:
[NSString stringWithFormat:@"Could not parse EBNF for grammar. %ld:%ld: Found %@, Expected %@.", (long)[t lineNumber] + 1, (long)[t columnNumber] + 1, t, acceptableTokens], NSLocalizedDescriptionKey,
nil]]];
return [CPRecoveryAction recoveryActionStop];
}
- (BOOL)tokeniser:(CPTokeniser *)tokeniser shouldConsumeToken:(CPToken *)token
{
return YES;
}
- (NSArray *)tokeniser:(CPTokeniser *)tokeniser willProduceToken:(CPToken *)token
{
if ([token isWhiteSpaceToken])
{
return [NSArray array];
}
return [NSArray arrayWithObject:token];
}
@end
@implementation CPGrammar
@synthesize start;
+ (id)grammarWithStart:(NSString *)start rules:(NSArray *)rules
{
return [[[self alloc] initWithStart:start rules:rules] autorelease];
}
- (id)initWithStart:(NSString *)initStart rules:(NSArray *)initRules;
{
self = [super init];
if (nil != self)
{
[self setStart:initStart];
[self setRules:initRules];
[self setFollowCache:[NSMutableDictionary dictionary]];
}
return self;
}
+ (id)grammarWithStart:(NSString *)start backusNaurForm:(NSString *)bnf
{
return [[[self alloc] initWithStart:start backusNaurForm:bnf] autorelease];
}
+ (id)grammarWithStart:(NSString *)start backusNaurForm:(NSString *)bnf error:(NSError **)error
{
return [[[self alloc] initWithStart:start backusNaurForm:bnf error:error] autorelease];
}
- (id)initWithStart:(NSString *)initStart backusNaurForm:(NSString *)bnf
{
NSError *err = nil;
self = [self initWithStart:initStart backusNaurForm:bnf error:&err];
if (nil == self)
{
NSLog(@"=== Core Parse Error ===");
NSLog(@"%@", err);
}
return self;
}
- (id)initWithStart:(NSString *)initStart backusNaurForm:(NSString *)bnf error:(NSError **)error
{
CPBNFParserDelegate *del = [[[CPBNFParserDelegate alloc] init] autorelease];
CPTokeniser *tokeniser = [[[CPTokeniser alloc] init] autorelease];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"::="]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"@"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"<"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@">"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"("]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@")"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"*"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"+"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"?"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@"|"]];
[tokeniser addTokenRecogniser:[CPKeywordRecogniser recogniserForKeyword:@";"]];
[tokeniser addTokenRecogniser:[CPNumberRecogniser integerRecogniser]];
[tokeniser addTokenRecogniser:[CPQuotedRecogniser quotedRecogniserWithStartQuote:@"\"" endQuote:@"\"" escapeSequence:@"\\" name:@"String"]];
[tokeniser addTokenRecogniser:[CPQuotedRecogniser quotedRecogniserWithStartQuote:@"'" endQuote:@"'" escapeSequence:@"\\" name:@"String"]];
[tokeniser addTokenRecogniser:[CPIdentifierRecogniser identifierRecogniser]];
[tokeniser addTokenRecogniser:[CPWhiteSpaceRecogniser whiteSpaceRecogniser]];
[tokeniser setDelegate:del];
CPTokenStream *tokenStream = [tokeniser tokenise:bnf];
CPRule *ruleset1 = [CPRule ruleWithName:@"ruleset" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"ruleset"], [CPGrammarSymbol nonTerminalWithName:@"rule"], nil] tag:0];
CPRule *ruleset2 = [CPRule ruleWithName:@"ruleset" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"rule"], nil] tag:1];
CPRule *rule1 = [CPRule ruleWithName:@"rule" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol terminalWithName:@"Number"], [CPGrammarSymbol nonTerminalWithName:@"unNumbered"], nil] tag:2];
CPRule *rule2 = [CPRule ruleWithName:@"rule" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"unNumbered"], nil] tag:3];
CPRule *unNumbered = [CPRule ruleWithName:@"unNumbered" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol terminalWithName:@"Identifier"], [CPGrammarSymbol terminalWithName:@"::="], [CPGrammarSymbol nonTerminalWithName:@"rightHandSide"], [CPGrammarSymbol terminalWithName:@";"], nil] tag:4];
CPRule *rightHandSide1 = [CPRule ruleWithName:@"rightHandSide" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"rightHandSide"], [CPGrammarSymbol terminalWithName:@"|"], [CPGrammarSymbol nonTerminalWithName:@"sumset"], nil] tag:5];
CPRule *rightHandSide2 = [CPRule ruleWithName:@"rightHandSide" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"rightHandSide"], [CPGrammarSymbol terminalWithName:@"|"], nil] tag:6];
CPRule *rightHandSide3 = [CPRule ruleWithName:@"rightHandSide" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"sumset"], nil] tag:7];
CPRule *sumset1 = [CPRule ruleWithName:@"sumset" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"sumset"], [CPGrammarSymbol nonTerminalWithName:@"taggedRightHandSideItem"], nil] tag:8];
CPRule *sumset2 = [CPRule ruleWithName:@"sumset" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"taggedRightHandSideItem"], nil] tag:9];
CPRule *taggedRightHandSideItem1 = [CPRule ruleWithName:@"taggedRightHandSideItem" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"rightHandSideItem"], nil] tag:10];
CPRule *taggedRightHandSideItem2 = [CPRule ruleWithName:@"taggedRightHandSideItem" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol terminalWithName:@"Identifier"], [CPGrammarSymbol terminalWithName:@"@"], [CPGrammarSymbol nonTerminalWithName:@"taggedRightHandSideItem"], nil] tag:11];
CPRule *rightHandSideItem1 = [CPRule ruleWithName:@"rightHandSideItem" rightHandSideElements:[NSArray arrayWithObject:[CPGrammarSymbol nonTerminalWithName:@"unit"]] tag:12];
CPRule *rightHandSideItem2 = [CPRule ruleWithName:@"rightHandSideItem" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"unit"], [CPGrammarSymbol nonTerminalWithName:@"repeatSymbol"], nil] tag:13];
CPRule *unit1 = [CPRule ruleWithName:@"unit" rightHandSideElements:[NSArray arrayWithObject:[CPGrammarSymbol nonTerminalWithName:@"grammarSymbol"]] tag:14];
CPRule *unit2 = [CPRule ruleWithName:@"unit" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol terminalWithName:@"("], [CPGrammarSymbol nonTerminalWithName:@"rightHandSide"], [CPGrammarSymbol terminalWithName:@")"], nil] tag:15];
CPRule *repeatSymbol1 = [CPRule ruleWithName:@"repeatSymbol" rightHandSideElements:[NSArray arrayWithObject:[CPGrammarSymbol terminalWithName:@"*"]] tag:16];
CPRule *repeatSymbol2 = [CPRule ruleWithName:@"repeatSymbol" rightHandSideElements:[NSArray arrayWithObject:[CPGrammarSymbol terminalWithName:@"+"]] tag:17];
CPRule *repeatSymbol3 = [CPRule ruleWithName:@"repeatSymbol" rightHandSideElements:[NSArray arrayWithObject:[CPGrammarSymbol terminalWithName:@"?"]] tag:18];
CPRule *grammarSymbol1 = [CPRule ruleWithName:@"grammarSymbol" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"nonterminal"], nil] tag:19];
CPRule *grammarSymbol2 = [CPRule ruleWithName:@"grammarSymbol" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol nonTerminalWithName:@"terminal"], nil] tag:20];
CPRule *nonterminal = [CPRule ruleWithName:@"nonterminal" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol terminalWithName:@"<"], [CPGrammarSymbol terminalWithName:@"Identifier"], [CPGrammarSymbol terminalWithName:@">"], nil] tag:21];
CPRule *terminal = [CPRule ruleWithName:@"terminal" rightHandSideElements:[NSArray arrayWithObjects:[CPGrammarSymbol terminalWithName:@"String"], nil] tag:22];
CPGrammar *bnfGrammar = [CPGrammar grammarWithStart:@"ruleset" rules:[NSArray arrayWithObjects:ruleset1, ruleset2, rule1, rule2, unNumbered, rightHandSide1, rightHandSide2, rightHandSide3, sumset1, sumset2, taggedRightHandSideItem1, taggedRightHandSideItem2, rightHandSideItem1, rightHandSideItem2, unit1, unit2, repeatSymbol1, repeatSymbol2, repeatSymbol3, grammarSymbol1, grammarSymbol2, nonterminal, terminal, nil]];
CPParser *parser = [CPLALR1Parser parserWithGrammar:bnfGrammar];
[parser setDelegate:del];
NSMutableArray *initRules = [parser parse:tokenStream];
if ([del err] != nil)
{
if (NULL != error)
{
*error = [[[del err] copy] autorelease];
}
return nil;
}
NSArray *newRules = [self tidyRightHandSides:initRules error:error];
if (nil == newRules)
{
return nil;
}
return [self initWithStart:initStart rules:newRules];
}
- (id)init
{
return [self initWithStart:nil rules:[NSArray array]];
}
#define CPGrammarStartKey @"s"
#define CPGrammarRulesKey @"r"
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super init];
if (nil != self)
{
[self setStart:[aDecoder decodeObjectForKey:CPGrammarStartKey]];
[self setRules:[aDecoder decodeObjectForKey:CPGrammarRulesKey]];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:[self start] forKey:CPGrammarStartKey];
[aCoder encodeObject:[self rules] forKey:CPGrammarRulesKey];
}
- (void)dealloc
{
[start release];
[self setRules:nil];
[super dealloc];
}
- (NSSet *)allRules
{
return [NSSet setWithArray:[self rules]];
}
- (NSArray *)allNonTerminalNames
{
return [[self rulesByNonTerminal] allKeys];
}
- (void)addRule:(CPRule *)rule
{
NSMutableDictionary *rs = [self rulesByNonTerminal];
NSMutableArray *arr = [rs objectForKey:[rule name]];
if (nil == arr)
{
arr = [NSMutableArray array];
[rs setObject:arr forKey:[rule name]];
}
[arr addObject:rule];
}
- (NSArray *)rulesForNonTerminalWithName:(NSString *)nonTerminal
{
return [[self rulesByNonTerminal] objectForKey:nonTerminal];
}
- (NSUInteger)hash
{
return [[self start] hash] << 16 + [[self rules] hash];
}
- (BOOL)isGrammar
{
return YES;
}
- (BOOL)isEqual:(id)object
{
return ([object isGrammar] &&
[((CPGrammar *)object)->start isEqualToString:start] &&
[[(CPGrammar *)object rules] isEqualToArray:[self rules]]);
}
@end