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149 lines
4.3 KiB
149 lines
4.3 KiB
// [The "BSD licence"]
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// Copyright (c) 2006-2007 Kay Roepke 2010 Alan Condit
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// 3. The name of the author may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#import "Parser.h"
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@implementation Parser
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+ (Parser *)newParser:(id<TokenStream>)anInput
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{
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return [[Parser alloc] initWithTokenStream:anInput];
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}
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+ (Parser *)newParser:(id<TokenStream>)anInput State:(RecognizerSharedState *)aState
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{
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return [[Parser alloc] initWithTokenStream:anInput State:aState];
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}
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- (id) initWithTokenStream:(id<TokenStream>)theStream
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{
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if ((self = [super init]) != nil) {
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[self setInput:theStream];
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}
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return self;
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}
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- (id) initWithTokenStream:(id<TokenStream>)theStream State:(RecognizerSharedState *)aState
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{
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if ((self = [super initWithState:aState]) != nil) {
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[self setInput:theStream];
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}
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return self;
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}
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- (void) reset
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{
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[super reset]; // reset all recognizer state variables
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if ( input!=nil ) {
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[input seek:0]; // rewind the input
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}
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}
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- (void) dealloc
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{
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#ifdef DEBUG_DEALLOC
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NSLog( @"called dealloc in Parser" );
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#endif
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[input release];
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[super dealloc];
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}
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//----------------------------------------------------------
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// input
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//----------------------------------------------------------
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- (id<TokenStream>) input
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{
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return input;
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}
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- (void) setInput: (id<TokenStream>) anInput
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{
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if (input != anInput) {
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if ( input ) [input release];
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[anInput retain];
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}
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input = anInput;
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}
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- (id) getCurrentInputSymbol:(id<TokenStream>)anInput
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{
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state.token = [input LT:1];
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return state.token;
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}
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- (CommonToken *)getMissingSymbol:(id<TokenStream>)anInput
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Exception:(RecognitionException *)e
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TType:(NSInteger)expectedTokenType
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BitSet:(ANTLRBitSet *)follow
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{
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NSString *tokenText = nil;
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if ( expectedTokenType == TokenTypeEOF )
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tokenText = @"<missing EOF>";
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else
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tokenText = [NSString stringWithFormat:@"<missing %@>\n",[[BaseRecognizer getTokenNames] objectAtIndex:expectedTokenType]];
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CommonToken *t = [[CommonToken newToken:expectedTokenType Text:tokenText] retain];
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CommonToken *current = [anInput LT:1];
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if ( current.type == TokenTypeEOF ) {
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current = [anInput LT:-1];
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}
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t.line = current.line;
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t.charPositionInLine = current.charPositionInLine;
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t.channel = TokenChannelDefault;
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t.input = current.input;
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return t;
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}
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/** Set the token stream and reset the parser */
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- (void) setTokenStream:(id<TokenStream>)anInput
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{
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input = nil;
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[self reset];
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input = anInput;
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}
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- (id<TokenStream>)getTokenStream
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{
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return input;
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}
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- (NSString *)getSourceName
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{
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return [input getSourceName];
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}
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- (void) traceIn:(NSString *)ruleName Index:(int)ruleIndex
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{
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[super traceIn:ruleName Index:ruleIndex Object:[input LT:1]];
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}
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- (void) traceOut:(NSString *)ruleName Index:(NSInteger) ruleIndex
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{
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[super traceOut:ruleName Index:ruleIndex Object:[input LT:1]];
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}
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@end
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