73bcce88
 luigser
COMPONENTS
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/**
* Manage examples
*/
(function() {
var examples = {};
var treeURL = 'https://api.github.com/repos/PrismJS/prism/git/trees/gh-pages?recursive=1';
var treePromise = new Promise(function (resolve) {
$u.xhr({
url: treeURL,
callback: function (xhr) {
if (xhr.status < 400) {
resolve(JSON.parse(xhr.responseText).tree);
}
}
});
});
var languages = components.languages;
for (var id in languages) {
if (id === 'meta') {
continue;
}
(function (id) {
var language = languages[id];
var checked = false;
if (language.option === 'default') {
checked = true;
}
language.enabled = checked;
language.path = languages.meta.path.replace(/\{id}/g, id) + '.js';
language.examplesPath = languages.meta.examplesPath.replace(/\{id}/g, id) + '.html';
fileExists(language.examplesPath).then(function (exists) {
$u.element.create('label', {
attributes: {
'data-id': id,
'title': !exists ? 'No examples are available for this language.' : ''
},
className: !exists ? 'unavailable' : '',
contents: [
{
tag: 'input',
properties: {
type: 'checkbox',
name: 'language',
value: id,
checked: checked && exists,
disabled: !exists,
onclick: function () {
$$('input[name="' + this.name + '"]').forEach(function (input) {
languages[input.value].enabled = input.checked;
});
update(id);
}
}
},
language.title
],
inside: '#languages'
});
examples[id] = $u.element.create('section', {
'id': 'language-' + id,
'className': 'language-' + id,
inside: '#examples'
});
if (checked) {
update(id);
}
});
}(id));
}
function fileExists(filepath) {
return treePromise.then(function (tree) {
for (var i = 0, l = tree.length; i < l; i++) {
if (tree[i].path === filepath) {
return true;
}
}
return false;
});
}
function getFileContents(filepath) {
return new Promise(function (resolve, reject) {
$u.xhr({
url: filepath,
callback: function (xhr) {
if (xhr.status < 400 && xhr.responseText) {
resolve(xhr.responseText);
} else {
reject();
}
}
});
});
}
function update(id) {
var language = languages[id];
if (language.enabled) {
if (!language.examplesPromise) {
language.examplesPromise = getFileContents(language.examplesPath);
}
language.examplesPromise.then(function (contents) {
examples[id].innerHTML = contents;
loadLanguage(id).then(function () {
var elements = examples[id].querySelectorAll('code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code');
for (var i=0, element; element = elements[i++];) {
Prism.highlightElement(element);
}
});
});
} else {
examples[id].innerHTML = '';
}
}
/**
* Loads a language, including all dependencies
*
* @param {string} lang the language to load
* @type {Promise} the promise which resolves as soon as everything is loaded
*/
function loadLanguage (lang)
{
// at first we need to fetch all dependencies for the main language
// Note: we need to do this, even if the main language already is loaded (just to be sure..)
//
// We load an array of all dependencies and call recursively this function on each entry
//
// dependencies is now an (possibly empty) array of loading-promises
var dependencies = getDependenciesOfLanguage(lang).map(loadLanguage);
// We create a promise, which will resolve, as soon as all dependencies are loaded.
// They need to be fully loaded because the main language may extend them.
return Promise.all(dependencies)
.then(function () {
// If the main language itself isn't already loaded, load it now
// and return the newly created promise (we chain the promises).
// If the language is already loaded, just do nothing - the next .then()
// will immediately be called
if (!Prism.languages[lang]) {
return new Promise(function (resolve) {
$u.script('components/prism-' + lang + '.js', resolve);
});
}
});
}
/**
* Returns all dependencies (as identifiers) of a specific language
*
* @param {string} lang
* @returns {Array.<string>} the list of dependencies. Empty if the language has none.
*/
function getDependenciesOfLanguage (lang)
{
if (!components.languages[lang] || !components.languages[lang].require)
{
return [];
}
return ($u.type(components.languages[lang].require) === "array")
? components.languages[lang].require
: [components.languages[lang].require];
}
}());
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