Hi, all. I am trying to write a parser for an input similar to the following:
A = 'TEST1' and B = 'TEST2'
The problem I am having is that the parser is not returning error in
the following scenarios:
1. A dangling left paren:
A = 'TEST1' and B = 'TEST2' (
2. A dangling ID:
A = 'TEST1' and B = 'TEST2' A
Is there some options I need to turn on to get these kinds of errors?
Thanks!
Charles
grammar Script;
options {
output=AST;
}
@parser::header {
import java.util.Map;
import java.util.HashMap;
import java.math.BigDecimal;
}
@parser::members {
public Map<String, Object> values = new HashMap<String, Object>();
public static void main(String[] args) throws Exception {
ScriptLexer lexer = new ScriptLexer(new ANTLRFileStream(args[0]));
CommonTokenStream tokenStream = new CommonTokenStream(lexer);
ScriptParser parser = new ScriptParser(tokenStream);
parser.values.put("A", "TEST1");
parser.values.put("B", "TEST2");
parser.values.put("C", "TEST3");
System.out.println(parser.statement().value);
}
protected void mismatch(IntStream input, int ttype, BitSet follow)
throws RecognitionException {
throw new MismatchedTokenException(ttype, input);
}
public Object recoverFromMismatchedSet(IntStream input,
RecognitionException e, BitSet follow) throws RecognitionException {
throw e;
}
}
@rulecatch {
catch (RecognitionException ex) {
throw ex;
}
}
/*------------------------------------------------------------------
* PARSER RULES
*------------------------------------------------------------------*/
statement returns [boolean value]: e=orcondition { $value = $e.value; }
;
orcondition returns [boolean value]
: e=andcondition { $value = $e.value; } (OR^ e=andcondition {
$value = $value || $e.value; })*
;
andcondition returns [boolean value]
: e=expression { $value = $e.value; } (AND^ e=expression { $value
= $value && $e.value; })*
;
expression returns [boolean value]
: ID operator rhs
{
Object idValue = (Object)values.get($ID.text);
Object rhsValue = $rhs.value;
$value = idValue.equals(rhsValue);
}
| LEFT_PAREN! orcondition RIGHT_PAREN!
{
$value = $orcondition.value;
}
;
operator : GTE | LTE | GT | LT | EQ | NOT_EQ
;
rhs returns [Object value]
: e=INTEGER { $value = Integer.valueOf($e.text); } |
e=FLOAT { $value = new BigDecimal($e.text); } |
e=STRING_LITERAL { $value = $e.text.substring(1, $e.text.length() -
1); } |
TRUE { $value = Boolean.TRUE; } |
FALSE { $value = Boolean.FALSE; }
;
/*------------------------------------------------------------------
* LEXER RULES
*------------------------------------------------------------------*/
AND : 'and'
;
OR : 'or'
;
LT : '<'
;
GT : '>'
;
LTE : '<='
;
GTE : '>='
;
EQ : '='
;
NOT_EQ : '!='
;
TRUE : 'true'
;
FALSE : 'false'
;
ID : ( 'a' .. 'z' | 'A' .. 'Z' | '.' | '_' )+
;
STRING_LITERAL : '\'' ( ( '\'' '\'' )=> '\'' '\'' | ~'\'' )* '\''
;
LEFT_PAREN : '('
;
RIGHT_PAREN : ')'
;
WS : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; }
;
SIGN : '+' | '-'
;
INTEGER: '0' | SIGN? '1'..'9' '0'..'9'*;
FLOAT: INTEGER '.' '0'..'9'+;
List: http://www.antlr.org/mailman/listinfo/antlr-interest
Unsubscribe:
http://www.antlr.org/mailman/options/antlr-interest/your-email-address
--
You received this message because you are subscribed to the Google Groups
"il-antlr-interest" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/il-antlr-interest?hl=en.
