Hi,
I'm having problems getting a (so far) very simple grammar to accept it's input:
-------------------------------------
grammar Simulink;
IDENTIFIER : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
;
INT : '0'..'9'+
;
FLOAT
: ('0'..'9')+ '.' ('0'..'9')* EXPONENT?
| '.' ('0'..'9')+ EXPONENT?
| ('0'..'9')+ EXPONENT
;
COMMENT
: '#' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
;
WS : ( ' '
| '\t'
| '\r'
| '\n'
) {$channel=HIDDEN;}
;
STRING
: '"' ( ESC_SEQ | ~('\\'|'"') )* '"'
;
fragment
EXPONENT : ('e'|'E') ('+'|'-')? ('0'..'9')+ ;
fragment
HEX_DIGIT : ('0'..'9'|'a'..'f'|'A'..'F') ;
fragment
ESC_SEQ
: '\\' ('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\')
| UNICODE_ESC
| OCTAL_ESC
;
fragment
OCTAL_ESC
: '\\' ('0'..'3') ('0'..'7') ('0'..'7')
| '\\' ('0'..'7') ('0'..'7')
| '\\' ('0'..'7')
;
fragment
UNICODE_ESC
: '\\' 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT
;
fragment
BLOCK_BEGIN
: '{'
;
fragment
BLOCK_END
: '}'
;
file : block+
;
block : IDENTIFIER BLOCK_BEGIN BLOCK_END
;
-------------------------------------
This is the input:
-------------------------------------
# bla
Model {
}
-------------------------------------
And here is what happens when I try to feed it to the grammar:
-------------------------------------
$ make smalltests
antlr3 -verbose -trace -report Simulink.g
ANTLR Parser Generator Version 3.3 Nov 30, 2010 12:50:56
Simulink.g
Simulink.file:65:8 decision 1: k=1
javac -classpath antlr/antlr-3.3-complete.jar:. SimulinkLexer.java
javac -classpath antlr/antlr-3.3-complete.jar:. SimulinkParser.java
javac -classpath antlr/antlr-3.3-complete.jar:. Test.java
cat testdata/empty.mdl | java -classpath
antlr/antlr-3.3-complete.jar:. Test
enter COMMENT # line=1:0
exit COMMENT M line=2:0
enter IDENTIFIER M line=2:0
exit IDENTIFIER line=2:5
enter file [@1,6:10='Model',<4>,2:0]
enter block [@1,6:10='Model',<4>,2:0]
enter WS line=2:5
exit WS { line=2:6
line 2:6 no viable alternative at character '{'
enter WS
line=2:7
exit WS } line=3:0
line 3:0 no viable alternative at character '}'
enter WS
line=3:1
exit WS
line=4:0
enter WS
line=4:0
exit WS line=5:0
line 5:0 mismatched input '<EOF>' expecting BLOCK_BEGIN
exit block [@6,17:17='<EOF>',<-1>,5:0]
exit file [@6,17:17='<EOF>',<-1>,5:0]
-------------------------------------
As I understand it the parser consumes 'Model' as IDENTIFIER and goes into
state block. It ignores a WS, then finds a '{'. This should be recognized as
BLOCK_BEGIN, which is the next token expected in block---any idea what I'm
doing wrong?
best regards
Florian Franzmann
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