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hungtcs/Expr.g4

Last active December 13, 2023 06:06
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搜索过滤表达式匹配
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README.md

可以匹配类似 Github 的搜索表达式，如

author:hungtcs keyword

image

Raw
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);
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