angular-cn/tools/transpiler/index.js

109 lines
2.7 KiB
JavaScript

// Entry point for Node.
var fs = require('fs');
var glob = require('glob');
var path = require('path');
var traceur = require('traceur');
exports.RUNTIME_PATH = traceur.RUNTIME_PATH;
var TRACEUR_PATH = traceur.RUNTIME_PATH.replace('traceur-runtime.js', 'traceur.js');
var SELF_SOURCE_REGEX = /transpiler\/src/;
var SELF_COMPILE_OPTIONS = {
modules: 'register',
moduleName: true,
script: false // parse as a module
};
var needsReload = true;
var oldSystemGet = System.get;
exports.reloadSources = function() {
needsReload = true;
};
exports.compile = function compile(options, paths, source) {
if (needsReload) {
reloadCompiler();
needsReload = false;
}
var inputPath, outputPath, moduleName;
if (typeof paths === 'string') {
inputPath = outputPath = paths;
} else {
inputPath = paths.inputPath;
outputPath = paths.inputPath;
moduleName = paths.moduleName;
}
outputPath = outputPath || inputPath;
moduleName = moduleName || inputPath;
moduleName = moduleName.replace(/\.\w*$/, '');
var localOptions = extend(options, {
moduleName: moduleName
});
var CompilerCls = System.get('transpiler/src/compiler').Compiler;
var compiler = new CompilerCls(localOptions);
var result = {
js: compiler.compile(source, inputPath, outputPath),
sourceMap: null
};
var sourceMapString = compiler.getSourceMap();
if (sourceMapString) {
result.sourceMap = JSON.parse(sourceMapString);
}
return result;
};
// Transpile and evaluate the code in `src`.
// Use existing traceur to compile our sources.
function reloadCompiler() {
loadModule(TRACEUR_PATH, false);
glob.sync(__dirname + '/src/**/*.js').forEach(function(fileName) {
loadModule(fileName, true);
});
// Traceur modules are register with the ".js" extension but we don't want
// to add it to all the import statements.
System.get = function get(normalizedName) {
var m = oldSystemGet.call(this, normalizedName);
if (!m && normalizedName.indexOf('traceur') == 0) {
m = oldSystemGet.call(this, normalizedName + '.js');
}
return m;
};
}
function loadModule(filepath, transpile) {
var data = fs.readFileSync(filepath, 'utf8');
if (!data) {
throw new Error('Failed to import ' + filepath);
}
if (transpile) {
var moduleName = path.normalize(filepath)
.replace(__dirname, 'transpiler')
.replace(/\\/g, '/')
.replace(/\.\w*$/, '');
data = (new traceur.NodeCompiler(
extend(SELF_COMPILE_OPTIONS, { moduleName: moduleName } )
)).compile(data, filepath, filepath);
}
('global', eval)(data);
}
function extend(source, props) {
var res = {};
for (var prop in source) {
res[prop] = source[prop];
}
for (var prop in props) {
res[prop] = props[prop];
}
return res;
}