The compiler should provide a way to export the AST as JSON

[gilramir]

It's very useful to be able to analyze Gren source code in any language.
The Module and Context data from a parse can be exported as JSON.

One idea is to call this "gren parse":

 % ./gren.sh parse --help
The `parse` command parses a Gren source file and outputs its AST as JSON:

    gren parse <filename>

For example:

    gren parse src/Main.gren

This parses src/Main.gren and writes a JSON object containing the filename, the
AST ("ast" field), and all comments ("context" field) to stdout. Use
--output=file.json to write to a file instead.

You can customize this command with the following flags:

    --output=<output-file>
        Write the JSON output to a file instead of stdout

It could export the ast (Module), context (comments), and filename. E.g.:

% ./gren.sh parse ../gren-format/compiler-node/tests/src/Test/Formatter/Strings.gren | grep '^  "'
  "filename": "../gren-format/compiler-node/tests/src/Test/Formatter/Strings.gren",
  "ast": {
  "context": [

[gilramir]

I have a sample implementation at https://github.com/gilramir/gren-compiler/tree/issue_370_export_ast

[robinheghan]

I want to wait for the parser and language to stabelize more before introducing functionality like this. We still expect breaking changes to the parser.