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|
// This file is part of PyANTLR. See LICENSE.txt for license
// details..........Copyright (C) Wolfgang Haefelinger, 2004.
//
// $Id$
options {
language=Python;
}
class expr_p extends Parser;
options {
codeGenMakeSwitchThreshold = 3;
codeGenBitsetTestThreshold = 4;
buildAST=true;
ASTLabelType = "antlr.CommonAST"; // change default of "AST"
}
expr : assignExpr EOF! ;
assignExpr
: addExpr
(
ASSIGN^
assignExpr
)?
;
addExpr
: multExpr
(
pm:PLUS_MINUS^
me:multExpr
exception
catch [ antlr.RecognitionException,ex ]
{
print "Caught error in addExpr"
self.reportError(ex)
}
)*
;
multExpr
: postfixExpr
(
MULT_DIV^
postfixExpr
)*
;
postfixExpr
: (id:ID LPAREN)=>
// Matches function call syntax like "id(arg,arg)"
id2:ID^
(
parenArgs
)?
| atom
;
parenArgs
:
LPAREN!
(
assignExpr
(
COMMA!
assignExpr
)*
)?
RPAREN!
;
atom
: ID
| INT
| CHAR_LITERAL
| STRING_LITERAL
| LPAREN! assignExpr RPAREN!
;
class expr_l extends Lexer;
WS : (' '
| '\t'
| '\n'
| '\r')
{ _ttype = SKIP; }
;
LPAREN: '('
;
RPAREN: ')'
;
PLUS_MINUS: '+' | '-'
;
MULT_DIV : '*' | '/'
;
ASSIGN : '='
;
COMMA : ','
;
CHAR_LITERAL
: '\'' (ESC|~'\'') '\''
;
STRING_LITERAL
: '"' (ESC|~'"')* '"'
;
protected
ESC : '\\'
( 'n'
| 'r'
| 't'
| 'b'
| 'f'
| '"'
| '\''
| '\\'
| ('0'..'3')
(
options {
warnWhenFollowAmbig = false;
}
: ('0'..'9')
(
options {
warnWhenFollowAmbig = false;
}
: '0'..'9'
)?
)?
| ('4'..'7')
(
options {
warnWhenFollowAmbig = false;
}
: ('0'..'9')
)?
)
;
protected
DIGIT
: '0'..'9'
;
INT
: (DIGIT)+
;
ID
options {
testLiterals = true;
}
: ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*
;
|
