为什么自定义符号很多不支持比如 ≠、≥、≤ · alibaba/QLExpress#414

(1 评论) (0 反应) (0 负责人)Java (4,457 star) (1,113 fork)batch import

help wanted

描述

Caused by: com.alibaba.qlexpress4.exception.QLSyntaxException: [Error SYNTAX_ERROR: rule nextStatement failed predicate: {_input.LA(1) == Token.EOF || _input.LA(1) == QLexer.RBRACE}?] [Near: 1 ≠ 2] ^ [Line: 1, Column: 2] at com.alibaba.qlexpress4.exception.QLException.reportScannerErr(QLException.java:56) at com.alibaba.qlexpress4.aparser.QLErrorListener.syntaxError(QLErrorListener.java:28) at com.alibaba.qlexpress4.a4runtime.ProxyErrorListener.syntaxError(ProxyErrorListener.java:41) at com.alibaba.qlexpress4.a4runtime.Parser.notifyErrorListeners(Parser.java:544) at com.alibaba.qlexpress4.a4runtime.DefaultErrorStrategy.reportFailedPredicate(DefaultErrorStrategy.java:344) at com.alibaba.qlexpress4.a4runtime.DefaultErrorStrategy.reportError(DefaultErrorStrategy.java:142) at com.alibaba.qlexpress4.aparser.QLParser.nextStatement(QLParser.java:469)

贡献者指南

技术栈: java
领域: backend
议题类型: feature
难度: 3
预计时间: 1-2 days
活动状态: fresh
清晰度: mostly clear
前置要求: JavaANTLR/parser knowledgeQLExpress grammar
新手友好度: 30
研究方向: Investigate the QLExpress grammar definition files (e.g., QLParser.g4) to understand current operator parsing. The error occurs in QLParser.nextState(). Determine if symbols like ≠, ≥, ≤ are missing from lexer/parser tokens and add them, mapping to Java operators. Check for existing operator extension mechanisms. Engage with reporter to confirm exact symbol set required.