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|
// This file is part of PyANTLR. See LICENSE.txt for license
// details..........Copyright (C) Wolfgang Haefelinger, 2004.
//
// $Id$
header {
import keepws
}
options {
language=Python;
}
class keepws_p extends Parser;
options {
buildAST = true;
k=2;
}
tokens {
CALL; // define imaginary token CALL
}
slist
: ( stat )+
;
stat: LBRACE^ (stat)+ RBRACE
| "if"^ expr "then" stat ("else" stat)?
| ID ASSIGN^ expr SEMI
| call
;
expr
: mexpr (PLUS^ mexpr)*
;
mexpr
: atom (STAR^ atom)*
;
atom: INT
| ID
;
call: ID LPAREN (expr)? RPAREN SEMI
{#call = #(#[CALL,"CALL"], #call);}
;
class keepws_l extends Lexer;
options {
charVocabulary = '\3'..'\377';
}
WS : (' '
| '\t'
| ('\n'|'\r'('\n')?) {$newline;}
)+
;
// Single-line comments
SL_COMMENT
: "//"
(~('\n'|'\r'))* ('\n'|'\r'('\n')?)
{$newline;}
;
LBRACE: '{'
;
RBRACE: '}'
;
LPAREN: '('
;
RPAREN: ')'
;
STAR: '*'
;
PLUS: '+'
;
SEMI: ';'
;
ASSIGN
: '='
;
protected
DIGIT
: '0'..'9'
;
INT : (DIGIT)+
;
ID : ('a'..'z')+
;
class keepws_w extends TreeParser;
slist
: {keepws.dumpHidden(keepws.getstream().getInitialHiddenToken());}
(stat)+
;
stat: #(LBRACE {keepws.pr(#LBRACE);} (stat)+ RBRACE {keepws.pr(#RBRACE);})
| #(i:"if" {keepws.pr(i);} expr t:"then" {keepws.pr(t);} stat (e:"else" {keepws.pr(e);} stat)?)
| #(ASSIGN ID {keepws.pr(#ID); keepws.pr(#ASSIGN);} expr SEMI {keepws.pr(#SEMI);} )
| call
;
expr
: #(PLUS expr {keepws.pr(#PLUS);} expr)
| #(STAR expr {keepws.pr(#STAR);} expr)
| INT {keepws.pr(#INT);}
| ID {keepws.pr(#ID);}
;
call: {
self.callDumpInstrumentation(#call);
}
#(CALL ID {keepws.pr(#ID);}
LPAREN {keepws.pr(#LPAREN);} (expr)? RPAREN {keepws.pr(#RPAREN);}
SEMI
{
keepws.write(#SEMI.getText())
keepws.write("}")
keepws.dumpHidden(#SEMI.getHiddenAfter())
}
)
;
/** Dump instrumentation for a call statement.
* The reference to rule expr prints out the arg
* and then at the end of this rule, we close the
* generated called to dbg.invoke().
*/
callDumpInstrumentation
: #(CALL id:ID
{keepws.write("{dbg.invoke(\""+id.getText()+"\", \"");}
LPAREN (e:expr)? RPAREN SEMI
{keepws.write("\"); ");}
)
;
|
