catharsis/bin/parse.js

A JavaScript parser for Google Closure Compiler and JSDoc type expressions.

#!/usr/bin/env node

// Command-line tool that parses a type expression and dumps a JSON version of the parse tree.
const catharsis = require('../catharsis');
const path = require('path');
const util = require('util');

const command = path.basename(process.argv[1]);
const typeExpression = process.argv[2];
const opts = {
  describe: false,
  jsdoc: false,
};
let parsedType;

function usage() {
  console.log(util.format('Usage:\n    %s typeExpression [--jsdoc] [--describe]', command));
}

function done(err) {
  // eslint-disable-next-line no-process-exit
  process.exit(err === undefined ? 0 : err);
}

process.argv.slice(3).forEach((arg) => {
  const parsedArg = arg.replace(/^-{2}/, '');

  if (opts[parsedArg] !== undefined) {
    opts[parsedArg] = true;
  } else {
    console.error('Unknown option "%s"', arg);
    usage();
    done(1);
  }
});

if (!typeExpression) {
  usage();
  done(1);
} else {
  try {
    parsedType = catharsis.parse(typeExpression, opts);
    if (opts.describe) {
      parsedType = catharsis.describe(parsedType);
    }
  } catch (e) {
    console.error(util.format('Unable to parse "%s" (exception follows):', typeExpression));
    console.error(e.stack || e.message);
    done(1);
  }

  console.log(JSON.stringify(parsedType, null, 2));
  done();
}