node-less/lib/selector.js

Less Compiler For Node

(function (module) {

    var Selector = function (elements, extendList) {
        this.elements = elements;
        this.extendList = extendList || [];
    };

    Selector.prototype = {
        type: "Selector",
        accept: function (visitor) {
            this.elements = visitor.visit(this.elements);
            this.extendList = visitor.visit(this.extendList)
        },
        match: function (other) {
            var elements = this.elements,
                len = elements.length,
                oelements, olen, max, i;
            oelements = other.elements.slice(
                (other.elements.length && other.elements[0].value === "&") ? 1 : 0);
            olen = oelements.length;
            max = Math.min(len, olen);

            if (olen === 0 || len < olen) {
                return false;
            } else {
                for (i = 0; i < max; i++) {
                    if (elements[i].value !== oelements[i].value) {
                        return false;
                    }
                }
            }
            return true;
        },
        eval: function (env) {
            return new Selector(this.elements.map(function (e) {
                return e.eval(env);
            }), this.extendList.map(function(extend) {
                return extend.eval(env);
            }));
        },
        toCSS: function (env) {
            if (this._css) { return this._css }
            if (this.elements[0].combinator.value === "") {
                this._css = ' ';
            } else {
                this._css = '';
            }
            this._css += this.elements.map(function (e) {
                if (typeof(e) === 'string') {
                    return ' ' + e.trim();
                } else {
                    return e.toCSS(env);
                }
            }).join('');
            return this._css;
        }
    };

    module.exports = Selector;

})(module);