| // |
| // ANTLRCommonErrorNode.m |
| // ANTLR |
| // |
| // [The "BSD licence"] |
| // Copyright (c) 2010 Alan Condit |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // 1. Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // 2. Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // 3. The name of the author may not be used to endorse or promote products |
| // derived from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #import "ANTLRCommonErrorNode.h" |
| #import "ANTLRMissingTokenException.h" |
| #import "ANTLRNoViableAltException.h" |
| #import "ANTLRTreeNodeStream.h" |
| #import "ANTLRUnwantedTokenException.h" |
| |
| @implementation ANTLRCommonErrorNode |
| |
| + (id) newANTLRCommonErrorNode:(id<ANTLRTokenStream>)anInput |
| From:(id<ANTLRToken>)aStartToken |
| To:(id<ANTLRToken>)aStopToken |
| Exception:(ANTLRRecognitionException *) e |
| { |
| return [[ANTLRCommonErrorNode alloc] initWithInput:anInput From:aStartToken To:aStopToken Exception:e]; |
| } |
| |
| - (id) init |
| { |
| self = [super init]; |
| if ( self != nil ) { |
| } |
| return self; |
| } |
| |
| - (id) initWithInput:(id<ANTLRTokenStream>)anInput |
| From:(id<ANTLRToken>)aStartToken |
| To:(id<ANTLRToken>)aStopToken |
| Exception:(ANTLRRecognitionException *) e |
| { |
| self = [super init]; |
| if ( self != nil ) { |
| //System.out.println("aStartToken: "+aStartToken+", aStopToken: "+aStopToken); |
| if ( aStopToken == nil || |
| ([aStopToken getTokenIndex] < [aStartToken getTokenIndex] && |
| aStopToken.type != ANTLRTokenTypeEOF) ) |
| { |
| // sometimes resync does not consume a token (when LT(1) is |
| // in follow set. So, aStopToken will be 1 to left to aStartToken. adjust. |
| // Also handle case where aStartToken is the first token and no token |
| // is consumed during recovery; LT(-1) will return null. |
| aStopToken = aStartToken; |
| } |
| input = anInput; |
| if ( input ) [input retain]; |
| startToken = aStartToken; |
| if ( startToken ) [startToken retain]; |
| stopToken = aStopToken; |
| if ( stopToken ) [stopToken retain]; |
| trappedException = e; |
| if ( trappedException ) [trappedException retain]; |
| } |
| return self; |
| } |
| |
| - (void)dealloc |
| { |
| #ifdef DEBUG_DEALLOC |
| NSLog( @"called dealloc in ANTLRCommonErrorNode" ); |
| #endif |
| if ( input ) [input release]; |
| if ( startToken ) [startToken release]; |
| if ( stopToken ) [stopToken release]; |
| if ( trappedException ) [trappedException release]; |
| [super dealloc]; |
| } |
| |
| - (BOOL) isNil |
| { |
| return NO; |
| } |
| |
| - (NSInteger)type |
| { |
| return ANTLRTokenTypeInvalid; |
| } |
| |
| - (NSString *)text |
| { |
| NSString *badText = nil; |
| if ( [startToken isKindOfClass:[self class]] ) { |
| int i = [(id<ANTLRToken>)startToken getTokenIndex]; |
| int j = [(id<ANTLRToken>)stopToken getTokenIndex]; |
| if ( stopToken.type == ANTLRTokenTypeEOF ) { |
| j = [(id<ANTLRTokenStream>)input size]; |
| } |
| badText = [(id<ANTLRTokenStream>)input toStringFromStart:i ToEnd:j]; |
| } |
| else if ( [startToken isKindOfClass:[self class]] ) { |
| badText = [(id<ANTLRTreeNodeStream>)input toStringFromNode:startToken ToNode:stopToken]; |
| } |
| else { |
| // people should subclass if they alter the tree type so this |
| // next one is for sure correct. |
| badText = @"<unknown>"; |
| } |
| return badText; |
| } |
| |
| - (NSString *)toString |
| { |
| NSString *aString; |
| if ( [trappedException isKindOfClass:[ANTLRMissingTokenException class]] ) { |
| aString = [NSString stringWithFormat:@"<missing type: %@ >", |
| [(ANTLRMissingTokenException *)trappedException getMissingType]]; |
| return aString; |
| } |
| else if ( [trappedException isKindOfClass:[ANTLRUnwantedTokenException class]] ) { |
| aString = [NSString stringWithFormat:@"<extraneous: %@, resync=%@>", |
| [trappedException getUnexpectedToken], |
| [self text]]; |
| return aString; |
| } |
| else if ( [trappedException isKindOfClass:[ANTLRMismatchedTokenException class]] ) { |
| aString = [NSString stringWithFormat:@"<mismatched token: %@, resync=%@>", trappedException.token, [self text]]; |
| return aString; |
| } |
| else if ( [trappedException isKindOfClass:[ANTLRNoViableAltException class]] ) { |
| aString = [NSString stringWithFormat:@"<unexpected: %@, resync=%@>", trappedException.token, [self text]]; |
| return aString; |
| } |
| aString = [NSString stringWithFormat:@"<error: %@>",[self text]]; |
| return aString; |
| } |
| |
| @synthesize input; |
| @synthesize startToken; |
| @synthesize stopToken; |
| @synthesize trappedException; |
| @end |