【问题】
在折腾:
【已解决】antlr调试时,antlr的语法是对的,但是却识别继续识别输入的内容
的过程中,换用antlrworks-1.2.2.jar去编译同样的代码:
grammar DDParserDemo;
options {
output = AST;
ASTLabelType = CommonTree; // type of $stat.tree ref etc...
}
//NEWLINE : '\r'? '\n' ;
//NEWLINE : '\r' '\n' ;
NEWLINE : '\r' '\n' ;
ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
;
FLOAT
: ('0'..'9')+ '.' ('0'..'9')* EXPONENT?
| '.' ('0'..'9')+ EXPONENT?
| ('0'..'9')+ EXPONENT
;
COMMENT
: '//' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
| '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;}
;
WS : ( ' '
| '\t'
| '\r'
| '\n'
) {skip();}
;
STRING
: '"' ( ESC_SEQ | ~('\\'|'"') )* '"'
;
CHAR: '\'' ( 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
DIGIT
: '0'..'9';
//FAKE_TOKEN : '1' '2' '3';
/*
DECIMAL_VALUE
: '1'..'9' DIGIT*;
*/
DECIMAL_VALUE
: DIGIT*;
HEX_VALUE
: '0x' HEX_DIGIT+;
/*
startParse : (identification)+;
*/
startParse : (identification)+;
identification : definiton WS* ','? WS* -> definiton
;
definiton : (ID)^ ('\t'!|' '!)+ (DECIMAL_VALUE | HEX_VALUE)
;结果出错了:
[13:13:31] warning(200): DDParserDemo.g:87:28: Decision can match input such as "WS" using multiple alternatives: 1, 2 [13:13:31] warning(200): D:\DevRoot\IndustrialMobileAutomation\HandheldDataSetter\ANTLR\projects\v1.5\DDParserDemo\DDParserDemo.g:87:28: Decision can match input such as "WS" using multiple alternatives: 1, 2 As a result, alternative(s) 2 were disabled for that input [13:13:37] D:\DevRoot\IndustrialMobileAutomation\HandheldDataSetter\ANTLR\projects\v1.5\DDParserDemo\output\__Test__.java:14: error: cannot find symbol [13:13:37] g.NEWLINE(); [13:13:37] ^ [13:13:37] symbol: method NEWLINE() [13:13:37] location: variable g of type DDParserDemoParser [13:13:37] 1 error |
注:
1.同样的代码,在antlrworks-1.5rc2.jar中,却是可以正常编译执行调试的。
2. 关于各个版本的antlrworks所含的antlr等的版本,详见:
【总结】使用ANTLR和ANTLRWorks的开发心得和注意事项
【解决过程】
1.参考:
[antlr-interest] Simple Grammar breaks ANTLRWorks Interpreter & Debugger?
去给NEWLINE添加上fragment,变成:
//NEWLINE : '\r'? '\n' ; //NEWLINE : '\r' '\n' ; fragment NEWLINE : '\r' '\n' ;
看看结果。结果果然就是可以正常去编译,然后可以去调试了:
【总结】
貌似,对于,无法再分解的内容,应该加上fragment,才能否正常在,旧的antlr,即antlrworks-1.2.2.jar中通过编译(然后去调试的)
注:
1. 此处的antlrworks-1.2.2.jar包含的是:
- antlrworks-1.2.2.jar
- ANTLRWorks: 1.2.2
- ANTLR: 3.1.1
- StringTemplate: 3.2
- XJLibrary: 2.0
2.即使不加fragment,在新的antlr:
- antlrworks-1.5rc2.jar
- ANTLRWorks:1.5
- ANTLR:3.5-rc2
- StringTemplate v3:3.2.1
- StringTemplate v4:4.0.7-rc2
中,也是可以正常编译,然后可以去调试的。
3.关于fragment,详见:
转载请注明:在路上 » 【已解决】用antlrworks-1.2.2.jar编译代码出错:error: cannot find symbol,g.NEWLINE();,symbol: method NEWLINE()