272 lines
7.5 KiB
JavaScript
272 lines
7.5 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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/* jshint node:true */
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/* globals cp, ls, test */
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'use strict';
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require('shelljs/make');
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var fs = require('fs'),
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path = require('path'),
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vm = require('vm');
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/**
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* A simple preprocessor that is based on the firefox preprocessor
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* see (https://developer.mozilla.org/en/Build/Text_Preprocessor). The main
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* difference is that this supports a subset of the commands and it supports
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* preproccesor commands in html style comments.
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* Currently Supported commands:
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* - if
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* - else
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* - endif
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* - include
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* - expand
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*/
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function preprocess(inFilename, outFilename, defines) {
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// TODO make this really read line by line.
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var lines = fs.readFileSync(inFilename).toString().split('\n');
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var totalLines = lines.length;
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var out = '';
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var i = 0;
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function readLine() {
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if (i < totalLines) {
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return lines[i++];
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}
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return null;
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}
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var writeLine = (typeof outFilename === 'function' ? outFilename :
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function(line) {
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out += line + '\n';
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});
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function include(file) {
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var realPath = fs.realpathSync(inFilename);
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var dir = path.dirname(realPath);
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preprocess(path.join(dir, file), writeLine, defines);
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}
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function expand(line) {
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line = line.replace(/__[\w]+__/g, function(variable) {
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variable = variable.substring(2, variable.length - 2);
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if (variable in defines) {
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return defines[variable];
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}
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return '';
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});
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writeLine(line);
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}
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var s, state = 0, stack = [];
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var control =
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/^(?:\/\/|<!--)\s*#(if|else|endif|expand|include)(?:\s+(.*?)(?:-->)?$)?/;
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var lineNumber = 0;
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while ((s = readLine()) !== null) {
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++lineNumber;
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var m = control.exec(s);
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if (m) {
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switch (m[1]) {
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case 'if':
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stack.push(state);
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try {
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state = vm.runInNewContext(m[2], defines) ? 3 : 1;
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} catch (e) {
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console.error('Could not evalute line \'' + m[2] + '\' at ' +
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fs.realpathSync(inFilename) + ':' + lineNumber);
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throw e;
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}
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break;
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case 'else':
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state = state === 1 ? 3 : 2;
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break;
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case 'endif':
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state = stack.pop();
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break;
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case 'expand':
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if (state === 0 || state === 3) {
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expand(m[2]);
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}
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break;
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case 'include':
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if (state === 0 || state === 3) {
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include(m[2]);
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}
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break;
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}
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} else {
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if (state === 0) {
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writeLine(s);
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} else if (state === 3) {
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writeLine(s.replace(/^\/\/|^<!--|-->/g, ' '));
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}
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}
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}
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if (state !== 0 || stack.length !== 0) {
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throw new Error('Missing endif in preprocessor.');
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}
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if (typeof outFilename !== 'function') {
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fs.writeFileSync(outFilename, out);
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}
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}
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exports.preprocess = preprocess;
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var deprecatedInMozcentral = new RegExp('(^|\\W)(' + [
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'-moz-box-sizing',
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'-moz-grab',
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'-moz-grabbing'
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].join('|') + ')');
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function preprocessCSS(mode, source, destination) {
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function hasPrefixedFirefox(line) {
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return (/(^|\W)-(ms|o|webkit)-\w/.test(line));
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}
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function hasPrefixedMozcentral(line) {
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return (/(^|\W)-(ms|o|webkit)-\w/.test(line) ||
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deprecatedInMozcentral.test(line));
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}
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function expandImports(content, baseUrl) {
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return content.replace(/^\s*@import\s+url\(([^\)]+)\);\s*$/gm,
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function(all, url) {
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var file = path.join(path.dirname(baseUrl), url);
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var imported = fs.readFileSync(file, 'utf8').toString();
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return expandImports(imported, file);
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});
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}
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function removePrefixed(content, hasPrefixedFilter) {
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var lines = content.split(/\r?\n/g);
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var i = 0;
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while (i < lines.length) {
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var line = lines[i];
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if (!hasPrefixedFilter(line)) {
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i++;
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continue;
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}
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if (/\{\s*$/.test(line)) {
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var bracketLevel = 1;
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var j = i + 1;
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while (j < lines.length && bracketLevel > 0) {
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var checkBracket = /([{}])\s*$/.exec(lines[j]);
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if (checkBracket) {
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if (checkBracket[1] === '{') {
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bracketLevel++;
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} else if (lines[j].indexOf('{') < 0) {
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bracketLevel--;
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}
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}
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j++;
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}
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lines.splice(i, j - i);
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} else if (/[};]\s*$/.test(line)) {
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lines.splice(i, 1);
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} else {
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// multiline? skipping until next directive or bracket
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do {
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lines.splice(i, 1);
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} while (i < lines.length &&
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!/\}\s*$/.test(lines[i]) &&
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lines[i].indexOf(':') < 0);
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if (i < lines.length && /\S\s*}\s*$/.test(lines[i])) {
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lines[i] = lines[i].substr(lines[i].indexOf('}'));
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}
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}
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// collapse whitespaces
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while (lines[i] === '' && lines[i - 1] === '') {
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lines.splice(i, 1);
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}
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}
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return lines.join('\n');
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}
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if (!mode) {
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throw new Error('Invalid CSS preprocessor mode');
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}
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var content = fs.readFileSync(source, 'utf8').toString();
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content = expandImports(content, source);
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if (mode === 'mozcentral' || mode === 'firefox') {
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content = removePrefixed(content, mode === 'mozcentral' ?
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hasPrefixedMozcentral : hasPrefixedFirefox);
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}
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fs.writeFileSync(destination, content);
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}
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exports.preprocessCSS = preprocessCSS;
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/**
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* Simplifies common build steps.
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* @param {object} setup
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* .defines defines for preprocessors
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* .copy array of arrays of source and destination pairs of files to copy
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* .preprocess array of arrays of source and destination pairs of files
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* run through preprocessor.
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*/
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function build(setup) {
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var defines = setup.defines;
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setup.copy.forEach(function(option) {
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var source = option[0];
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var destination = option[1];
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cp('-R', source, destination);
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});
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setup.preprocess.forEach(function(option) {
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var sources = option[0];
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var destination = option[1];
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sources = ls('-R', sources);
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sources.forEach(function(source) {
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// ??? Warn if the source is wildcard and dest is file?
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var destWithFolder = destination;
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if (test('-d', destination)) {
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destWithFolder += '/' + path.basename(source);
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}
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preprocess(source, destWithFolder, defines);
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});
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});
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(setup.preprocessCSS || []).forEach(function(option) {
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var mode = option[0];
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var source = option[1];
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var destination = option[2];
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preprocessCSS(mode, source, destination);
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});
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}
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exports.build = build;
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function getWorkerSrcFiles(filePath) {
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var src = fs.readFileSync(filePath).toString();
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var reSrcFiles = /var\s+otherFiles\s*=\s*(\[[^\]]*\])/;
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var match = reSrcFiles.exec(src);
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try {
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var files = JSON.parse(match[1].replace(/'/g, '"'));
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var srcFiles = files.filter(function(name) {
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return name.indexOf('external') === -1;
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});
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var externalSrcFiles = files.filter(function(name) {
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return name.indexOf('external') > -1;
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});
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return {
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srcFiles: srcFiles,
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externalSrcFiles: externalSrcFiles
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};
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} catch(e) {
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return {};
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}
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}
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exports.getWorkerSrcFiles = getWorkerSrcFiles;
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/**
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* Merge two defines arrays. Values in the second param will override values in
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* the first.
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*/
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function merge(defaults, defines) {
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var ret = {};
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for (var key in defaults) {
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ret[key] = defaults[key];
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}
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for (key in defines) {
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ret[key] = defines[key];
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}
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return ret;
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}
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exports.merge = merge;
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