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(function (tree) {
//
// CSS @import node
//
// The general strategy here is that we don't want to wait
// for the parsing to be completed, before we start importing
// the file. That's because in the context of a browser,
// most of the time will be spent waiting for the server to respond.
//
// On creation, we push the import path to our import queue, though
// `import,push`, we also pass it a callback, which it'll call once
// the file has been fetched, and parsed.
//
tree.Import = function (path, imports, features, once, index) {
var that = this;
this.once = once;
this.index = index;
this._path = path;
this.features = features && new(tree.Value)(features);
// The '.less' extension is optional
if (path instanceof tree.Quoted) {
this.path = /\.(le?|c)ss(\?.*)?$/.test(path.value) ? path.value : path.value + '.less';
} else {
this.path = path.value.value || path.value;
}
this.css = /css(\?.*)?$/.test(this.path);
// Only pre-compile .less files
if (! this.css) {
imports.push(this.path, function (e, root, imported) {
if (e) { e.index = index }
if (imported && that.once) that.skip = imported;
that.root = root || new(tree.Ruleset)([], []);
});
}
};
//
// The actual import node doesn't return anything, when converted to CSS.
// The reason is that it's used at the evaluation stage, so that the rules
// it imports can be treated like any other rules.
//
// In `eval`, we make sure all Import nodes get evaluated, recursively, so
// we end up with a flat structure, which can easily be imported in the parent
// ruleset.
//
tree.Import.prototype = {
toCSS: function (env) {
var features = this.features ? ' ' + this.features.toCSS(env) : '';
if (this.css) {
return "@import " + this._path.toCSS() + features + ';\n';
} else {
return "";
}
},
eval: function (env) {
var ruleset, features = this.features && this.features.eval(env);
if (this.skip) return [];
if (this.css) {
return this;
} else {
ruleset = new(tree.Ruleset)([], this.root.rules.slice(0));
for (var i = 0; i < ruleset.rules.length; i++) {
if (ruleset.rules[i] instanceof tree.Import) {
Array.prototype
.splice
.apply(ruleset.rules,
[i, 1].concat(ruleset.rules[i].eval(env)));
}
}
return this.features ? new(tree.Media)(ruleset.rules, this.features.value) : ruleset.rules;
}
}
};
})(require('../tree'));
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