搜索过滤表达式匹配

README.md

可以匹配类似 Github 的搜索表达式，如

author:hungtcs keyword

Expr.g4

grammar Expr;

fragment ESC: '\\' .;
fragment DIGIT: [0-9];

WS: [ \t\r\n]+ -> skip;

COMMA: ',';
EXCLUDE: '-';
KEYWORLD: ~[ \t\r\n:,-]+;
QUOTED_STRING: '"' (ESC | ~["\\])* '"';

GT: ':>';
LT: ':<';
EQ: ':';
NE: ':!=';
GE: ':>=';
LE: ':<=';

DATE: DIGIT DIGIT DIGIT DIGIT '-' DIGIT DIGIT '-' DIGIT DIGIT;

filters: (tagsFilter | userFilter | authorFilter | createdFilter | keywordFilter)+ EOF;

date: DATE;

keyword: KEYWORLD | QUOTED_STRING;
keywordFilter: keyword (COMMA keyword)*;

tag: KEYWORLD | QUOTED_STRING;
tags: tag (COMMA tag)*;
tagsFilter: 'tags' EQ tags;

userFilter: 'user' EQ keyword;

authorFilter: 'author' EQ keyword;

createdFilter: 'created' createdOperation date;
createdOperation: (GT | LT | EQ | NE | GE | LE);