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tokenantlrlexical-analysis

ANTLR using a symbol as a token name

I want to use ( as a token name in a ANTLR lexer file. I've tried several versions, but none of them seem to work and cause errors when building. Here are my (broken) attempts:

(1) (: '(';

(2) '(': '(';

(3) '\(': '(';

(4) \(: '(';

Is this possible and, if so, how would I do that?

Solution

  • That is not possible. A rule name must start with an underscore or letter, and is followed by zero or more underscores, letters or digits. So '(', or whatever variation of it, is not a valid rule name.