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JavaCC

配置

<plugin>
<groupId>com.helger.maven</groupId>
<artifactId>ph-javacc-maven-plugin</artifactId>
<version>4.0.3</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>jjtree-javacc</goal>
</goals>
</execution>
</executions>
</plugin>

选项

"LOOKAHEAD" "=" java_integer_literal ";"
| "CHOICE_AMBIGUITY_CHECK" "=" java_integer_literal ";"
| "OTHER_AMBIGUITY_CHECK" "=" java_integer_literal ";"
| "STATIC" "=" java_boolean_literal ";"
| "SUPPORT_CLASS_VISIBILITY_PUBLIC" "=" java_boolean_literal ";"
| "DEBUG_PARSER" "=" java_boolean_literal ";"
| "DEBUG_LOOKAHEAD" "=" java_boolean_literal ";"
| "DEBUG_TOKEN_MANAGER" "=" java_boolean_literal ";"
| "ERROR_REPORTING" "=" java_boolean_literal ";"
| "JAVA_UNICODE_ESCAPE" "=" java_boolean_literal ";"
| "UNICODE_INPUT" "=" java_boolean_literal ";"
| "IGNORE_CASE" "=" java_boolean_literal ";"
| "USER_TOKEN_MANAGER" "=" java_boolean_literal ";"
| "USER_CHAR_STREAM" "=" java_boolean_literal ";"
| "BUILD_PARSER" "=" java_boolean_literal ";"
| "BUILD_TOKEN_MANAGER" "=" java_boolean_literal ";"
| "TOKEN_EXTENDS" "=" java_string_literal ";"
| "TOKEN_FACTORY" "=" java_string_literal ";"
| "TOKEN_MANAGER_USES_PARSER" "=" java_boolean_literal ";"
| "SANITY_CHECK" "=" java_boolean_literal ";"
| "FORCE_LA_CHECK" "=" java_boolean_literal ";"
| "COMMON_TOKEN_ACTION" "=" java_boolean_literal ";"
| "CACHE_TOKENS" "=" java_boolean_literal ";"
| "OUTPUT_DIRECTORY" "=" java_string_literal ";"

语法结构

/* 选项 */
options{
UNICODE_INPUT=true;
}

/* 解析器定义 */
PARSER_BEGIN(MyParser)
package me.wener.myparser;
import java.util.*;
import java.math.*;
import static me.wener.myparser.ParserHelper.*;
public class MyParser {

}
PARSER_END(MyParser)

/* 忽略的内容 */
SKIP:
{
" "
| "\t"
| "\r"
| "\f"
}

/* 词法定义 */
TOKEN: {
<LOGIC_OPERATOR: "&&" | "||" | "^" >
| <PREFXI_OPERATOR : "!">
}

TOKEN: {
< IDENTIFIER: <LETTER> (<LETTER>|<DIGIT>)*>
| < INTEGER: (<DIGIT>)+ >
| < #LETTER: ["a"-"z"] >
| < #DIGIT: ["0"-"9"] >
| < STRING:
"'"
(
(~["\'","\\","\n","\r"])
|("\\"
( ["n","t","b","r","f","\\","'","\""]
| ["0"-"7"] ( ["0"-"7"] )?
| ["0"-"3"] ["0"-"7"] ["0"-"7"]
)
)
)*
"'"
>
}

/* 语法定义 */
Term Term():{
}{
"$" <IDENTIFIER> {return new VariableTerm().setName(token.image);}
| <INTEGER> {return new IntegerTerm().setValue(Long.parseLong(token.image));}
| <STRING> {return new StringTerm().setValue(token.image.substring(1,token.image.length()-1));}
}