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//
// 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
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