我有这个ANTLR3语法:
grammar wft;
@header {
package com.mycompany.wftdiff.parser;
import com.mycompany.wftdiff.model.*;
}
@lexer::header {
package com.mycompany.wftdiff.parser;
}
@members {
private final WftFile wftFile = new WftFile();
public WftFile getParsingResult() {
return wftFile;
}
}
wftFile:
{
System.out.println("Heyo!");
}
(CommentLine | assignment | NewLine)*
itemTypeDefinition
EOF
;
/**
* ItemTypeDefinition
* DEFINE ITEM_TYPE
* END ITEM_TYPE
*/
itemTypeDefinition:
'DEFINE ITEM_TYPE' NewLine
(KeyName|TransStmt|BaseStmt|NewLine)+
WhiteSpace* 'DEFINE ITEM_ATTRIBUTE' NewLine
(KeyName|TransStmt|BaseStmt)*
WhiteSpace* 'END ITEM_ATTRIBUTE' NewLine
'END ITEM_TYPE'
;
/**
* KeyName
* KEY NAME VARCHAR2(8)
*/
KeyName: WhiteSpace* KeyNameStart .* {$channel = HIDDEN;} NewLine;
fragment KeyNameStart: 'KEY NAME VARCHAR2(';
/**
* TransStmt
* TRANS DISPLAY_NAME VARCHAR2(80)
*/
TransStmt: WhiteSpace* TransStmtStart .* {$channel = HIDDEN;} NewLine;
fragment TransStmtStart: 'TRANS';
/**
* BaseStmt
BASE PROTECT_LEVEL NUMBER
*/
BaseStmt: WhiteSpace* BaseStmtStart .* {$channel = HIDDEN;} NewLine;
fragment BaseStmtStart: 'BASE';
/**
* Assignment
*/
assignment returns [Assignment assignment]:
{
System.out.println("Assignment found!");
}
target=AssignmentTarget
WhiteSpace '=' WhiteSpace
value=String {
assignment = new Assignment(target.getText(), value.getText());
wftFile.addAssignment(new Assignment(target.getText(), value.getText()));
}
NewLine;
AssignmentTarget: A (A|D|'_')*;
String: '"' ~'"'* '"'
;
/**
* Comment
*/
CommentLine: CommentStart .* {$channel = HIDDEN;} NewLine;
fragment CommentStart: '#';
// Lexer rules
fragment D: '0'..'9';
fragment A: 'A'..'Z'
| 'a'..'z';
StringLength: D+;
NewLine : '\r' '\n' | '\n' | '\r';
WhiteSpace: ' ';
然后我用为它生成一个解析器
java -cp "D:\wftdiff\lib\antlr-3.5.2\antlr-3.5.2-complete.jar" org.antlr.Tool -o src/com/mycompany/wftdiff/parser/ grammar-src/wft.g
...并这样称呼它:
val lexer = wftLexer(ANTLRFileStream(fileName))
val parser = wftParser(CommonTokenStream(lexer))
parser.wftFile()
System.out.println("Test")
fileName
点包含以下内容的文本文件:
# Oracle Workflow Process Definition
# $Header$
VERSION_MAJOR = "2"
VERSION_MINOR = "6"
LANGUAGE = "GERMAN"
ACCESS_LEVEL = "100"
DEFINE ITEM_TYPE
KEY NAME VARCHAR2(8)
TRANS DISPLAY_NAME VARCHAR2(80)
TRANS DESCRIPTION VARCHAR2(240)
BASE PROTECT_LEVEL NUMBER
BASE CUSTOM_LEVEL NUMBER
BASE WF_SELECTOR VARCHAR2(240)
BASE READ_ROLE REFERENCES ROLE
BASE WRITE_ROLE REFERENCES ROLE
BASE EXECUTE_ROLE REFERENCES ROLE
BASE PERSISTENCE_TYPE VARCHAR2(8)
BASE PERSISTENCE_DAYS NUMBER
DEFINE ITEM_ATTRIBUTE
KEY NAME VARCHAR2(30)
TRANS DISPLAY_NAME VARCHAR2(80)
TRANS DESCRIPTION VARCHAR2(240)
BASE PROTECT_LEVEL NUMBER
BASE CUSTOM_LEVEL NUMBER
BASE TYPE VARCHAR2(8)
BASE FORMAT VARCHAR2(240)
BASE VALUE_TYPE VARCHAR2(8)
BASE DEFAULT VARCHAR2(4000)
END ITEM_ATTRIBUTE
END ITEM_TYPE
我得到以下的输出:
Heyo!
Assignment found!
Assignment found!
Assignment found!
Assignment found!
test-data/partialSample01.wft line 25:2 no viable alternative at character 'D'
test-data/partialSample01.wft line 35:2 no viable alternative at character 'E'
Test
我应该如何改变我的语法,以摆脱no viable alternative at character 'D'
错误的?
请注意,我并不需要解析该文件的这一部分(我不感兴趣,在这个特定的信息,它是后话在文件中)。
更新1:试图忽略了整个事情的建议here(使用skip()
),但它并没有帮助。
新的语法文件:
grammar wft;
@header {
package com.mycompany.wftdiff.parser;
import com.mycompany.wftdiff.model.*;
}
@lexer::header {
package com.mycompany.wftdiff.parser;
}
@members {
private final WftFile wftFile = new WftFile();
public WftFile getParsingResult() {
return wftFile;
}
}
wftFile:
{
System.out.println("Heyo!");
}
(CommentLine | assignment | NewLine)*
itemTypeDefinition
EOF
;
/**
* ItemTypeDefinition
* DEFINE ITEM_TYPE
* END ITEM_TYPE
*/
itemTypeDefinition:
'DEFINE ITEM_TYPE' NewLine
(KeyName|TransStmt|BaseStmt|NewLine)+
WhiteSpace*
NewLine
DefineItemAttribute
WhiteSpace*
'END ITEM_TYPE'
;
DefineItemAttribute: 'DEFINE ITEM_ATTRIBUTE' .* 'END ITEM_ATTRIBUTE' {skip();};
/**
* KeyName
* KEY NAME VARCHAR2(8)
*/
KeyName: WhiteSpace* KeyNameStart .* {$channel = HIDDEN;} NewLine;
fragment KeyNameStart: 'KEY NAME VARCHAR2(';
/**
* TransStmt
* TRANS DISPLAY_NAME VARCHAR2(80)
*/
TransStmt: WhiteSpace* TransStmtStart .* {$channel = HIDDEN;} NewLine;
fragment TransStmtStart: 'TRANS';
/**
* BaseStmt
BASE PROTECT_LEVEL NUMBER
*/
BaseStmt: WhiteSpace* BaseStmtStart .* {$channel = HIDDEN;} NewLine;
fragment BaseStmtStart: 'BASE';
/**
* Assignment
*/
assignment returns [Assignment assignment]:
{
System.out.println("Assignment found!");
}
target=AssignmentTarget
WhiteSpace '=' WhiteSpace
value=String {
assignment = new Assignment(target.getText(), value.getText());
wftFile.addAssignment(new Assignment(target.getText(), value.getText()));
}
NewLine;
AssignmentTarget: A (A|D|'_')*;
String: '"' ~'"'* '"'
;
/**
* Comment
*/
CommentLine: CommentStart .* {$channel = HIDDEN;} NewLine;
fragment CommentStart: '#';
// Lexer rules
fragment D: '0'..'9';
fragment A: 'A'..'Z'
| 'a'..'z';
StringLength: D+;
NewLine : '\r' '\n' | '\n' | '\r';
WhiteSpace: ' ';
解析结果:
Heyo!
Assignment found!
Assignment found!
Assignment found!
Assignment found!
test-data/partialSample01.wft line 25:2 no viable alternative at character 'D'
test-data/partialSample01.wft line 36:0 missing DefineItemAttribute at 'END ITEM_TYPE'
Test
赏金条款
我将颁发奖金给谁完成下列英雄事迹的人:
1.1。这里的一切都BEGIN ACTIVITY
和END ACTIVITY
标签,1.2。这里的一切都BEGIN ACTIVITY_TRANSITION
和END ACTIVITY_TRANSITION
,1.3。这里的一切都BEGIN PROCESS_ACTIVITY
和BEGIN PROCESS_ACTIVITY
标签。
所谓“承认一切”我的意思是,必须有ANTLR 3码,这让我把那将处理从文件中提取就像在原岗位的assignment
规则数据的Java语句。你不需要编写任何Java代码存在,但它必须能够对我来说,以后添加该代码。
未标记为相关的所有部件可以由分析器(类似于原来的语法的评论)被忽略。
java -cp "D:\wftdiff\lib\antlr-3.5.2\antlr-3.5.2-complete.jar" org.antlr.Tool -o src/com/mycompany/wftdiff/parser/ grammar-src/wft.g
产生,或者,如果你使用任何特殊的设置,你需要在你的答案指定它们。问题的关键是,我需要能够重现你的结果。这里是语法。它承认所有部件,只要你愿意,你可以添加Java操作。
编译和jdk1.8,ANTLR 3.5.2和所提供的样本输入测试。
grammar wft;
@header {
package com.mycompany.wftdiff.parser;
}
@lexer::header {
package com.mycompany.wftdiff.parser;
}
@members {
}
wftFile : (COMMENT|assignment|definition|flow)*
;
assignment
: ID EQ STRING
;
definition
: 'DEFINE' ID
(COMMENT | (dclass ID type) | definition)*
'END' ID
;
dclass : 'KEY' | 'BASE' | 'TRANS'
;
type : tnum | tvarchar | tref | tdate
;
tnum : 'NUMBER'
;
tvarchar: 'VARCHAR2' '(' INT ')'
;
tref : 'REFERENCES' ID
;
tdate : 'DATE'
;
flow : 'BEGIN' ID (STRING)+
(COMMENT|assignment|flow)+
'END' ID
;
EQ : '='
;
ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
;
NL : '\r'? '\n' {$channel=HIDDEN;}
;
COMMENT
: '#' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
;
WS : ( ' '
| '\t'
) {$channel=HIDDEN;}
;
STRING
: '"' ( ESC_SEQ | ~('\\'|'"') )* '"'
;
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
;
INT : '0'..'9'+
;