54 lines
2.0 KiB
JavaScript
54 lines
2.0 KiB
JavaScript
if (typeof(require) !== 'undefined') { var tree = require('less/tree') }
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//
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// CSS @import node
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//
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// The general strategy here is that we don't want to wait
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// for the parsing to be completed, before we start importing
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// the file. That's because in the context of a browser,
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// most of the time will be spent waiting for the server to respond.
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//
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// What we do is pass the `importer` function a callback, which it
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// will call when the file is available. Meanwhile, we continue parsing
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// the input. The `eval` function also takes a callback, which we call
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// inside the first callback [2a], depending on what was called first.
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// At this point, two things can happen:
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//
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// 1. The import is loaded and parsed before the current file finishes
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// parsing, in which case, we save the imported rules in `this.rules` [1a],
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// and when `this.eval` is called (during code-gen), we pass the
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// imported rules to the callback [1b].
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//
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// 2. The current file finishes parsing before the import.
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// In this case, the rules aren't available yet, so we save
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// the callback in `this.callback` [2b], which will be called when
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// the importer is done [2a].
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//
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tree.Import = function Import(path, import) {
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var that = this;
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// The '.less' extension is optional
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if (path instanceof tree.Quoted) {
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this.path = /\.(le?|c)ss$/.test(path.content) ? path.content : path.content + '.less';
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} else {
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this.path = path.value.content || path.value;
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}
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import.push(this.path, function (root) {
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that.root = root; // 1a.
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});
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};
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tree.Import.prototype = {
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toCSS: function () { return "" },
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eval: function () {
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for (var i = 0; i < this.root.rules.length; i++) {
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if (this.root.rules[i] instanceof tree.Import) {
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Array.prototype
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.splice
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.apply(this.root.rules,
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[i, 1].concat(this.root.rules[i].eval()));
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}
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}
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return this.root.rules;
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}
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};
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