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less.js
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less.js
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if (typeof window !== 'undefined') {
var less = require('npm:less/lib/less-browser/index')(window, window.less || {})
var head = document.getElementsByTagName('head')[0];
// get all injected style tags in the page
var styles = document.getElementsByTagName('style');
var styleIds = [];
for (var i = 0; i < styles.length; i++) {
if (!styles[i].hasAttribute("data-href")) continue;
styleIds.push(styles[i].getAttribute("data-href"));
}
var loadStyle = function (url) {
return new Promise(function (resolve, reject) {
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.onload = function () {
if (request.status >= 200 && request.status < 400) {
// Success!
var data = request.responseText;
var options = window.less || {};
options.filename = url;
options.rootpath = url.replace(/[^\/]*$/, '');
//render it using less
less.render(data, options).then(function (data) {
//inject it into the head as a style tag
var style = document.createElement('style');
style.textContent = '\r\n' + data.css;
style.setAttribute('type', 'text/css');
//store original type in the data-type attribute
style.setAttribute('data-type', 'text/less');
//store the url in the data-href attribute
style.setAttribute('data-href', url);
head.appendChild(style);
resolve('');
});
} else {
// We reached our target server, but it returned an error
reject()
}
};
request.onerror = function (e) {
reject(e)
};
request.send();
});
}
exports.fetch = function (load) {
// don't reload styles loaded in the head
for (var i = 0; i < styleIds.length; i++)
if (load.address == styleIds[i])
return '';
return loadStyle(load.address);
}
}
else {
exports.translate = function (load) {
// setting format = 'defined' means we're managing our own output
load.metadata.format = 'defined';
};
exports.bundle = function (loads, opts) {
var loader = this;
if (loader.buildCSS === false)
return '';
return loader.import('./less-builder', {name: module.id}).then(function (builder) {
return builder.call(loader, loads, opts);
});
}
}