jcaml.js

#!/usr/bin/env node

/*
 * A JCaml Compiler
 *
 * This is a command line application that compiles a JCamll program from
 * a file. There are three options:
 *
 * ./jcaml.js -a <filename>
 *     writes out the AST and stops
 *
 * ./jcaml.js -i <filename>
 *     writes the decorated AST then stops
 *
 * ./jcaml.js <filename>
 *     compiles the JCamll program to JavaScript, writing the generated
 *     JavaScript code to standard output.
 *
 * ./jcaml.js -o <filename>
 *     optimizes the intermediate code before generating target JavaScript.
 *
 * Output of the AST and decorated AST uses the object inspection functionality
 * built into Node.js.
 */


const argv = require("yargs")
    .usage("$0 [-a] [-o] [-i] filename")
    .boolean(["a", "o", "i"])
    .describe("a", "show abstract syntax tree after parsing then stop")
    .describe("o", "do optimizations")
    .describe("i", "generate and show the decorated abstract syntax tree then stop")
    .demand(1)
    .argv;

const fs = require("fs");
const util = require("util");
const parse = require("./parser");

require("./generator/generator");

fs.readFile(argv._[0], "utf-8", (err, text) => {
  if (err) {
    console.error(err);
    return;
  }
  let program = parse.parse(text);
  if (argv.a) {
    console.log(util.inspect(program, { depth: null }));
    return;
  }
  // program.analyze();
  if (argv.o) {
    program = program.optimize();
  }
  if (argv.i) {
    console.log(util.inspect(program, { depth: null }));
    return;
  }
  program.gen();
});