Hi All,
I'm having a problem with what I believe is an optimization within the ANTLR
code generation.
Consider the following sample grammar:
grammar CharSelectionTest;
@header {
import org.apache.commons.lang.StringUtils;
}
type : (type_sell | type_itsp) data ;
type_sell : character['s'];
type_itsp : character['i'];
data : BYTE_VALUE*;
character[char character_to_match]
: {input.LT(1).getText().charAt(0) ==
character_to_match}? BYTE_VALUE;
BYTE_VALUE : '\u0000'..'\uFFFE';
When ANTLR generates the Parser java code, the type() method seems to be
replacing the call to the character rule with an inline equivalent:
public final void type() throws RecognitionException {
try {
{
int alt1=2;
int LA1_0 = input.LA(1);
if ( (LA1_0==BYTE_VALUE) ) {
int LA1_1 = input.LA(2);
// Compile error: character_to_match is not defined!
if ( ((input.LT(1).getText().charAt(0) ==
character_to_match)) ) {
alt1=1;
}
else if ( ((input.LT(1).getText().charAt(0) ==
character_to_match)) ) {
alt1=2;
}
else {
NoViableAltException nvae =
new NoViableAltException("", 1, 1, input);
throw nvae;
}
}
...
}
Note that the variable character_to_match is not defined, since it's
supposed to be a parameter of the character rule.
Is there anything wrong with the rule definition in this simple grammar?
Is this a known issue?
Any workarounds / solutions to this problem?
Thanks very much for your help.
--
Alejandro Lujan
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