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Unified Diff: lib/src/prism/tests/helper/prism-loader.js

Issue 1418513006: update elements and fix some bugs (Closed) Base URL: git@github.com:dart-lang/polymer_elements.git@master
Patch Set: code review updates Created 5 years, 2 months ago
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Index: lib/src/prism/tests/helper/prism-loader.js
diff --git a/lib/src/prism/tests/helper/prism-loader.js b/lib/src/prism/tests/helper/prism-loader.js
new file mode 100644
index 0000000000000000000000000000000000000000..2885ad3028c6bc690a5da4c969f5f7ad74d66471
--- /dev/null
+++ b/lib/src/prism/tests/helper/prism-loader.js
@@ -0,0 +1,131 @@
+"use strict";
+
+var fs = require("fs");
+var vm = require("vm");
+var components = require("./components");
+var languagesCatalog = components.languages;
+
+
+module.exports = {
+
+ /**
+ * Creates a new Prism instance with the given language loaded
+ *
+ * @param {string|string[]} languages
+ * @returns {Prism}
+ */
+ createInstance: function (languages) {
+ var context = {
+ loadedLanguages: [],
+ Prism: this.createEmptyPrism()
+ };
+
+ context = this.loadLanguages(languages, context);
+
+ return context.Prism;
+ },
+
+ /**
+ * Loads the given languages and appends the config to the given Prism object
+ *
+ * @private
+ * @param {string|string[]} languages
+ * @param {{loadedLanguages: string[], Prism: Prism}} context
+ * @returns {{loadedLanguages: string[], Prism: Prism}}
+ */
+ loadLanguages: function (languages, context) {
+ if (typeof languages === 'string') {
+ languages = [languages];
+ }
+
+ var self = this;
+
+ languages.forEach(function (language) {
+ context = self.loadLanguage(language, context);
+ });
+
+ return context;
+ },
+
+ /**
+ * Loads the given language (including recursively loading the dependencies) and
+ * appends the config to the given Prism object
+ *
+ * @private
+ * @param {string} language
+ * @param {{loadedLanguages: string[], Prism: Prism}} context
+ * @returns {{loadedLanguages: string[], Prism: Prism}}
+ */
+ loadLanguage: function (language, context) {
+ if (!languagesCatalog[language]) {
+ throw new Error("Language '" + language + "' not found.");
+ }
+
+ // the given language was already loaded
+ if (-1 < context.loadedLanguages.indexOf(language)) {
+ return context;
+ }
+
+ // if the language has a dependency -> load it first
+ if (languagesCatalog[language].require) {
+ context = this.loadLanguages(languagesCatalog[language].require, context);
+ }
+
+ // load the language itself
+ var languageSource = this.loadFileSource(language);
+ context.Prism = this.runFileWithContext(languageSource, {Prism: context.Prism}).Prism;
+ context.loadedLanguages.push(language);
+
+ return context;
+ },
+
+
+ /**
+ * Creates a new empty prism instance
+ *
+ * @private
+ * @returns {Prism}
+ */
+ createEmptyPrism: function () {
+ var coreSource = this.loadFileSource("core");
+ var context = this.runFileWithContext(coreSource);
+ return context.Prism;
+ },
+
+
+ /**
+ * Cached file sources, to prevent massive HDD work
+ *
+ * @private
+ * @type {Object.<string, string>}
+ */
+ fileSourceCache: {},
+
+
+ /**
+ * Loads the given file source as string
+ *
+ * @private
+ * @param {string} name
+ * @returns {string}
+ */
+ loadFileSource: function (name) {
+ return this.fileSourceCache[name] = this.fileSourceCache[name] || fs.readFileSync(__dirname + "/../../components/prism-" + name + ".js", "utf8");
+ },
+
+
+ /**
+ * Runs a VM for a given file source with the given context
+ *
+ * @private
+ * @param {string} fileSource
+ * @param {*} [context]
+ *
+ * @returns {*}
+ */
+ runFileWithContext: function (fileSource, context) {
+ context = context || {};
+ vm.runInNewContext(fileSource, context);
+ return context;
+ }
+};
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