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119 lines
3.2 KiB
119 lines
3.2 KiB
//
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// UnbufferedTokenStream.m
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// ANTLR
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//
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// Created by Alan Condit on 7/12/10.
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// [The "BSD licence"]
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// Copyright (c) 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 "UnbufferedTokenStream.h"
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@implementation UnbufferedTokenStream
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@synthesize tokenSource;
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@synthesize tokenIndex;
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@synthesize channel;
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+ (UnbufferedTokenStream *)newUnbufferedTokenStream:(id<TokenSource>)aTokenSource
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{
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return [[UnbufferedTokenStream alloc] initWithTokenSource:aTokenSource];
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}
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- (id) init
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{
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if ((self = [super init]) != nil) {
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tokenSource = nil;
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tokenIndex = 0;
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channel = TokenChannelDefault;
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}
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return self;
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}
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- (id) initWithTokenSource:(id<TokenSource>)aTokenSource
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{
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if ((self = [super init]) != nil) {
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tokenSource = aTokenSource;
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if ( tokenSource ) [tokenSource retain];
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tokenIndex = 0;
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channel = TokenChannelDefault;
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}
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return self;
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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 UnbufferedTokenStream" );
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#endif
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if ( tokenSource ) [tokenSource release];
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[super dealloc];
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}
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- (id<Token>)nextElement
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{
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id<Token> t = [tokenSource nextToken];
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[t setTokenIndex:tokenIndex++];
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return t;
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}
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- (BOOL)isEOF:(id<Token>)aToken
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{
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return (aToken.type == TokenTypeEOF);
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}
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- (id<TokenSource>)getTokenSource
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{
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return tokenSource;
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}
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- (NSString *)toStringFromStart:(NSInteger)aStart ToEnd:(NSInteger)aStop
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{
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return @"n/a";
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}
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- (NSString *)toStringFromToken:(id<Token>)aStart ToEnd:(id<Token>)aStop
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{
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return @"n/a";
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}
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- (NSInteger)LA:(NSInteger)anIdx
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{
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return [[self LT:anIdx] type];
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}
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- (id<Token>)objectAtIndex:(NSInteger)anIdx
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{
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@throw [RuntimeException newException:@"Absolute token indexes are meaningless in an unbuffered stream"];
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}
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- (NSString *)getSourceName
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{
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return [tokenSource getSourceName];
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}
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@end
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