google/closure-compiler

Parser error on "combining character" (U+0307)

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#3,639 创建于 2020年7月14日

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 (8 评论) (8 反应) (0 负责人)Java (7,176 star) (1,197 fork)batch import
P3good first issuehelp wanted

描述

There seems to be an issue with parsing composite character sequences.

Composite character İ consist of the base character and combining character sequence (U+0049)(U+0307)
Using this character causing the compiler to fail with the parser error.

Example code

var bar = {
İ: "foo"
};

Compiler error

input0:2: ERROR - [JSC_PARSE_ERROR] Parse error. Character '̇' (U+0307) is not a valid identifier start char
  2| İ: "foo"
      ^

1 error(s), 0 warning(s)

Demo

Example

贡献者指南

技术栈
javascript
领域
tooling
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
JavaScript syntaxUnicode combining characters
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
40
研究方向
The error occurs in the JavaScript lexer/parser when validating identifier start characters. Investigate the lexer implementation to understand why combining character U+0307 is rejected. Look at the Unicode character validation logic, likely in the scanner or parser source files (e.g., JSTokenizer.java). The fix may involve allowing combining characters that follow a valid base character.