tools/preprocessor.mjs

#!/usr/bin/env node
// Copyright 2018 The Emscripten Authors.  All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License.  Both these licenses can be
// found in the LICENSE file.
//
// Preprocessor tool.  This is a wrapper for the 'preprocess' function which
// allows it to be called as a standalone tool.
//
// Parameters:
//    setting file.  Can specify 'settings.js' here, alternatively create a temp
//                   file with modified settings and supply the filename here.
//    input file     This is the file that will be processed by the preprocessor

import assert from 'assert';

import {loadSettingsFile} from '../src/utility.mjs';

const args = process.argv.slice(2);

assert(args.length >= 2, 'Script requires 2 arguments');
const settingsFile = args[0];
const inputFile = args[1];
const expandMacros = args.includes('--expandMacros');

loadSettingsFile(settingsFile);

// We can't use static import statements here because several of these
// file depend on having the settings defined in the global scope (which
// we do dynamically above.
const parseTools = await import('../src/parseTools.mjs');
await import('../src/modules.mjs');

let output = parseTools.preprocess(inputFile);
if (expandMacros) {
  output = parseTools.processMacros(output, inputFile);
}
process.stdout.write(output);