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preprocessor.mjs
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executable file
·69 lines (59 loc) · 2.03 KB
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#!/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
'use strict';
import * as fs from 'fs';
import * as path from 'path';
import * as vm from 'vm';
import assert from 'assert';
import * as url from 'url';
const args = process.argv.slice(2);
const debug = false;
// Anything needed by the script that we load below must be added to the
// global object. These, for example, are all needed by parseTools.js.
global.vm = vm;
global.assert = assert;
global.print = (x) => {
process.stdout.write(x + '\n');
};
global.printErr = (x) => {
process.stderr.write(x + '\n');
};
function find(filename) {
const dirname = url.fileURLToPath(new URL('.', import.meta.url));
const prefixes = [process.cwd(), path.join(dirname, '..', 'src')];
for (let i = 0; i < prefixes.length; ++i) {
const combined = path.join(prefixes[i], filename);
if (fs.existsSync(combined)) {
return combined;
}
}
return filename;
}
global.read = (filename) => {
const absolute = find(filename);
return fs.readFileSync(absolute).toString();
};
global.load = (f) => {
(0, eval)(read(f) + '//# sourceURL=' + find(f));
};
assert(args.length >= 2);
const settingsFile = args[0];
const inputFile = args[1];
const expandMacros = args.includes('--expandMacros');
load(settingsFile);
load('utility.js');
load('modules.js');
load('parseTools.js');
const output = expandMacros ? processMacros(preprocess(inputFile)) : preprocess(inputFile);
process.stdout.write(output);