78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
(function (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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// On creation, we push the import path to our import queue, though
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// `import,push`, we also pass it a callback, which it'll call once
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// the file has been fetched, and parsed.
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//
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tree.Import = function (path, imports) {
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var that = this;
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this._path = path;
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// The '.mess' extension is optional
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if (path instanceof tree.Quoted) {
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this.path = /\.(le?|c)ss$/.test(path.value) ? path.value : path.value + '.mess';
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} else {
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this.path = path.value.value || path.value;
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}
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this.css = /css$/.test(this.path);
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// Only pre-compile .mess files
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if (! this.css) {
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imports.push(this.path, function (root) {
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if (! root) {
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throw new(Error)("Error parsing " + that.path);
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}
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that.root = root;
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});
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}
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};
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//
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// The actual import node doesn't return anything, when converted to CSS.
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// The reason is that it's used at the evaluation stage, so that the rules
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// it imports can be treated like any other rules.
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//
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// In `eval`, we make sure all Import nodes get evaluated, recursively, so
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// we end up with a flat structure, which can easily be imported in the parent
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// ruleset.
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//
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tree.Import.prototype = {
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toCSS: function () {
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if (this.css) {
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return "@import " + this._path.toCSS() + ';\n';
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} else {
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return "";
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}
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},
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eval: function (env) {
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var ruleset;
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if (this.css) {
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return this;
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} else {
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ruleset = new(tree.Ruleset)(null, this.root.rules.slice(0));
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for (var i = 0; i < ruleset.rules.length; i++) {
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if (ruleset.rules[i] instanceof tree.Import) {
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Array.prototype
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.splice
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.apply(ruleset.rules,
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[i, 1].concat(ruleset.rules[i].eval(env)));
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}
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}
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return ruleset.rules;
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}
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}
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};
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})(require('mess/tree'));
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