first commit

build/node_modules/google-closure-compiler-js/lib/gulp.js

@@ -0,0 +1,127 @@
+/*
+ * Copyright 2016 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Gulp task for closure-compiler. Sends multiple input files
+ * into the compile method of Closure Compiler. This will yield a single
+ * vinyl file as output. Every input file includes contents, path and optional
+ * sourcemap.
+ */
+
+'use strict';
+
+const PLUGIN_NAME = 'gulp-google-closure-compiler-js';
+const DEFAULT_OUTPUT_PATH = 'compiled.js';
+
+
+/**
+ * Convert keys in the form "--foo_bar" or "zing_foo" to "fooBar" or "zingFoo", respectively.
+ *
+ * @param {string} key to convert
+ * @return {string}
+ */
+function cleanupOptionKey(key) {
+  // replace "_foo" with "Foo"
+  key = key.replace(/_(\w)/g, match => match[1].toUpperCase());
+
+  // remove leading dashes
+  key = key.replace(/^--/, '');
+
+  return key;
+}
+
+
+/**
+ * @return {function(Object<string>=, Object<string>=):Object}
+ */
+module.exports = function() {
+  const events = require('events');
+  const path = require('path');
+
+  const compile = require('../compile');
+  const logger = require('../logger');
+  const File = require('vinyl');
+  const Transform = require('stream').Transform;
+
+  class CompilationStream extends Transform {
+    constructor(compilationOptions, pluginOptions) {
+      super({objectMode: true});
+
+      this.compilationOptions_ = compilationOptions;
+      this.pluginName_ = pluginOptions.pluginName || PLUGIN_NAME;
+      this.logger_ = pluginOptions.logger || (message => console.info(message));
+
+      this.fileList_ = [];
+    }
+
+    _transform(file, enc, cb) {
+      if (file.isNull()) {
+        // Ignore empty files.
+      } else if (file.isStream()) {
+        this.emit('error', new PluginError(this.pluginName_, 'Streaming not supported'));
+      } else {
+        this.fileList_.push(file);
+      }
+      cb();
+    }
+
+    _flush(cb) {
+      const options = {};
+      for (const k in this.compilationOptions_) {
+        options[cleanupOptionKey(k)] = this.compilationOptions_[k];
+      }
+      options.jsCode = (options.jsCode || []).concat(this.fileList_.map(file => {
+        return {
+          // TODO(samthor): It's not clear we always want to have modules rooted 'here'
+          path: path.relative(process.cwd(), file.path),
+          src: file.contents.toString(),
+          sourceMap: file.sourceMap ? JSON.stringify(file.sourceMap) : undefined,
+        };
+      }));
+
+      const outputFile = options.jsOutputFile;
+      delete options.jsOutputFile;
+
+      const output = compile(options);
+      if (logger(options, output, this.logger_)) {
+        const message = `Compilation error, ${output.errors.length} errors`;
+        this.emit('error', new PluginError(this.pluginName_, message));
+      }
+
+      const file = new File({
+        path: outputFile || DEFAULT_OUTPUT_PATH,
+        contents: new Buffer(output.compiledCode),
+      });
+      if (output.sourceMap) {
+        file.sourceMap = JSON.parse(output.sourceMap);
+      }
+      this.push(file);
+
+      cb();
+    }
+  };
+
+  return function(compilationOptions, pluginOptions) {
+    return new CompilationStream(compilationOptions || {}, pluginOptions || {});
+  };
+};
+
+class PluginError {
+  constructor(plugin, message) {
+    this.plugin = plugin;
+    this.message = message;
+  }
+}