I am relatively new to ANTLR and am trying to use the PHP grammar that has been
used with the ANTLR PHP target. This grammar handles the first input token
separately as
a first body string using the following Java Code to override the nextToken()
function.
@lexer::members{
// Handle the first token, which will always be a BodyString.
public Token nextToken(){
//The following code was pulled out from super.nextToken()
if (input.index() == 0) {
try {
state.token = null;
state.channel = Token.DEFAULT_CHANNEL;
state.tokenStartCharIndex = input.index();
state.tokenStartCharPositionInLine =
input.getCharPositionInLine();
state.tokenStartLine = input.getLine();
state.text = null;
mFirstBodyString();
state.type = BodyString;
emit();
return state.token;
} catch (NoViableAltException nva) {
reportError(nva);
recover(nva); // throw out current char and try again
} catch (RecognitionException re) {
reportError(re);
// match() routine has already called recover()
}
}
return super.nextToken();
}
}
mFirstBodyString is created to identify the first body string as the following
fragment in the grammar.
fragment
FirstBodyString
: (('<' ~ '?')=> '<' | ~'<' )* '<?' ('php'?)
;
I am attempting to convert this to C but end up with a runtime error with a
pointer to memory location 0x0. My attempted code (ignoring the error handling
for now) is
given below.
@lexer::apifuncs{
TOKENSOURCE(ctx)->nextToken=myNextToken;
}
@lexer::members{
#include "phpTest.h"
pANTLR3_COMMON_TOKEN myNextToken(pANTLR3_TOKEN_SOURCE toksource){
pANTLR3_LEXER lexer;
lexer=(pANTLR3_LEXER)(toksource->super);
if(lexer->input->istream->index(lexer->input->istream)==0){
lexer->rec->state->token=NULL;
lexer->rec->state->channel=ANTLR3_TOKEN_DEFAULT_CHANNEL;
lexer->rec->state->tokenStartCharIndex=lexer->input->istream->index(lexer->input->istream);
lexer->rec->state->tokenStartCharPositionInLine=lexer->input->getCharPositionInLine(lexer->input);
lexer->rec->state->tokenStartLine=lexer->input->getLine(lexer->input);
lexer->rec->state->text=NULL;
mFirstBodyString(lex);
lexer->rec->state->type=BodyString;
lexer->emit(lexer);
return lexer->rec->state->token;
}
return lexer->rec->state->token;
}
}
phpTest.h just contains a global declaration of lex which is of type pphpLexer
and is the lexer used in the test rig. Please let me know what I'm doing wrong.
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