[TypeScript target] I would like to know how to create a custom visitor in TypeScript. about antlr4 HOT 4 CLOSED

Here is a repo containing an example for an "Expression" grammar with TypeScript: https://github.com/kaby76/ExpressionTypeScript. I gathered the visitor code from Antlr4ng , which is a fork of Antlr4, then ported it back to Antlr4. That example didn't work for Antlr4ng either (compilation errors among other problems).

But, to implement an Antlr visitor in TypeScript, you need to override every single visitor "method". In the example I provide, I didn't implement methods for subtraction, multiplication, or division, but you should get the point. From command line, bash run.sh -input '1+2', outputs 3.

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@kaby76
Thank you for quick reply.
I haven't tried this code yet, do I need to write code for the Visitor by myself instead of antlr?
And do I need to fix the Typescript implementation of the automatic generation to contribute to the document?

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There's nothing you need to write to get the example to work--other than have the prerequisites. The example is self contained. However, the build scripts are written for an Ubuntu environment, i.e., it uses "make", "Bash", etc., which every programmer should know.

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I was able to understand the example you gave by running.

And what I wanted to say is how to fix this document, I understand that too.

Thank you.

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