// 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.

// shell file This is the file that will be processed by the preprocessor

// *** Environment setup code ***

var arguments_ = [];

var debug = false;

var ENVIRONMENT_IS_NODE = typeof process === 'object';

var ENVIRONMENT_IS_WEB = typeof window === 'object';

var ENVIRONMENT_IS_WORKER = typeof importScripts === 'function';

var ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE && !ENVIRONMENT_IS_WORKER;

if (ENVIRONMENT_IS_NODE) {

// Expose functionality in the same simple way that the shells work

// Note that we pollute the global namespace here, otherwise we break in node

print = function(x) {

process['stdout'].write(x + '\n');

};

printErr = function(x) {

process['stderr'].write(x + '\n');

};

var nodeFS = require('fs');

var nodePath = require('path');

if (!nodeFS.existsSync) {

nodeFS.existsSync = function(path) {

try {

return !!nodeFS.readFileSync(path);

} catch(e) {

return false;

}

}

}

function find(filename) {

var prefixes = [process.cwd(), nodePath.join(__dirname, '..', 'src')];

for (var i = 0; i < prefixes.length; ++i) {

var combined = nodePath.join(prefixes[i], filename);

if (nodeFS.existsSync(combined)) {

return combined;

}

}

return filename;

}

read = function(filename) {

var absolute = find(filename);

return nodeFS['readFileSync'](absolute).toString();

};

load = function(f) {

globalEval(read(f));

};

arguments_ = process['argv'].slice(2);

} else if (ENVIRONMENT_IS_SHELL) {

// Polyfill over SpiderMonkey/V8 differences

if (!this['read']) {

this['read'] = function(f) { snarf(f) };

}

if (typeof scriptArgs != 'undefined') {

arguments_ = scriptArgs;

} else if (typeof arguments != 'undefined') {

arguments_ = arguments;

}

} else if (ENVIRONMENT_IS_WEB) {

this['print'] = printErr = function(x) {

console.log(x);

};

this['read'] = function(url) {

var xhr = new XMLHttpRequest();

xhr.open('GET', url, false);

xhr.send(null);

return xhr.responseText;

};

if (this['arguments']) {

arguments_ = arguments;

}

} else if (ENVIRONMENT_IS_WORKER) {

// We can do very little here...

this['load'] = importScripts;

} else {

throw 'Unknown runtime environment. Where are we?';

}

function globalEval(x) {

eval.call(null, x);

}

if (typeof load === 'undefined' && typeof read != 'undefined') {

this['load'] = function(f) {

globalEval(read(f));

};

}

if (typeof printErr === 'undefined') {

this['printErr'] = function(){};

}

if (typeof print === 'undefined') {

this['print'] = printErr;

}

// *** Environment setup code ***

// These global functions are referenced by parseTools, although only 'assert'

// is used by the preprocess function, so 'set' can be just a stub.

assert = function(condition, text) {

if (!condition) {

abort('Assertion failed: ' + text);

}

}

set = function() {}

var settings_file = arguments_[0];

var shell_file = arguments_[1];

var process_macros = arguments_.indexOf('--expandMacros') >= 0;

load(settings_file);

load('utility.js');

load('modules.js');

load('parseTools.js');

var from_html = read(shell_file);

var to_html = process_macros ? processMacros(preprocess(from_html, shell_file)) : preprocess(from_html, shell_file);

print(to_html);