Hi,
I have a sql.g grammar, and I use token NULL = 'null';
I get error NoViableAltException
Error: False
Linea: 39 Char: 48
UnexpectedType 69
Reale.Parsers.SqlOracle
[...@604,917:920='NULL',<69>,39:48]
Se produjo una excepción de tipo 'Antlr.Runtime.NoViableAltException'.
en Reale.Parsers.SqlOracle.SQLOracleParser.columnValue() en
e:\antlr\lexerexample\sqloracleparser.cs:línea 2335
nulo :
NULL // this way doesn't work !!!
//'NULL' // this way work !!!
;
I show fragment of my grammar:
grammar SQLOracle;
options {
language=CSharp2;
backtrack=true;
memoize=true;
output=AST;
//ASTLabelType=CommonTree;
ASTLabelType=SqlOracleAST;
//tokenVocab=FKVM;
}
...more...
constant
:
stringLiteral
| nulo
//nonNegativeInteger
//| Real
//| intervalLiteral
//| HexLiteral
// subset of ISO 8601 recommended for SQL Server 2005
//| Iso8601DateTime
//| TIMESTAMP s = stringLiteral
// currency & system variables not supported
;
// SQL 92 allows string literals broken by whitespace/comments
// (as long as it contains a newline - we're more permissive than that,
// and also allow mixing ASCII parts into Unicode strings).
stringLiteral :
singleStringLiteral ( singleStringLiteral )*
;
singleStringLiteral :
UnicodeStringLiteral
| AsciiStringLiteral
;
nulo :
NULL // this way doesn't work !!!
//'NULL' // this way work !!!
;
...more...
NULL : 'null' ;
fragment
AsciiStringRun :
// single-line literals only
( '\t' | ' ' .. '&' | '(' .. '~' )+
;
AsciiStringLiteral :
'\'' { $text = ""; }
( s = AsciiStringRun { $text = $s.text; } )? '\''
( '\'' {
$text = $text + "\'";
} ( s = AsciiStringRun { $text = $text + $s.text; } )? '\''
)*
;
fragment
UnicodeStringRun :
(~ '\'' )+
;
UnicodeStringLiteral :
'n' '\'' { $text = ""; }
( s = UnicodeStringRun { $text = $s.text; } )? '\''
( '\'' {
$text = $text + "\'";
} ( s = UnicodeStringRun { $text = $text + $s.text; } )? '\''
)*
;
Any suggestions, please
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