JAVA动态表达式：Antlr4 G4模板

Teln_小凯2024-06-14 13:07
能解析@xxx ，@xx.xx 这种表达式
复制代码
grammar Expr;

expression :
             '(' expression ')'          # parens
            | expression 'and' expression # andOp
            | expression 'or' expression  # orOp
            | AT_VARNAME comparison_op NUMBER # comparison
            | AT_VARNAME comparison_op STRING # comparison
            | AT_VARNAME comparison_op VARNAME # comparison
            | AT_VARNAME contains_op VARNAME # comparison
            | AT_VARNAME contains_op NUMBER # comparison
            | AT_VARNAME contains_op STRING # comparison
            | AT_VARNAME comparison_op AT_VARNAME # comparison
            | VARNAME comparison_op NUMBER # comparison
            | VARNAME comparison_op STRING # comparison
            | NUMBER comparison_op NUMBER # comparison
            | STRING comparison_op STRING # comparison
            | VARNAME comparison_op VARNAME # comparison
            | VARNAME contains_op VARNAME # comparison
            | VARNAME contains_op NUMBER # comparison
            | VARNAME contains_op STRING # comparison
            | STRING contains_op STRING # comparison
            ;

comparison_op : '<' | '<=' | '>' | '>=' | '==' | '!=';
contains_op: 'contains' | 'notcontains';

AT_VARNAME : '@' [a-zA-Z_0-9.]* VARNAME;
STRING : '\'' ( '\\' . | '\\\'' | ~[\\'] )* '\'';
NUMBER : '-'? [0-9]+ ('.' [0-9]+)?;
VARNAME : [a-zA-Z_][a-zA-Z_0-9]*;
WS : [ \t\r\n]+ -> skip; // 忽略空白字符
fragment Letter: [a-zA-Z];
fragment Digit: [0-9];
fragment ChineseCharacter: [\u4e00-\u9fa5];