(function (tree) {

tree.Rule = function (name, value, important, index, inline) {
    this.name = name;
    this.value = (value instanceof tree.Value) ? value : new(tree.Value)([value]);
    this.important = important ? ' ' + important.trim() : '';
    this.index = index;
    this.inline = inline || false;

    if (name.charAt(0) === '@') {
        this.variable = true;
    } else { this.variable = false }
};
tree.Rule.prototype.toCSS = function (env) {
    if (this.variable) { return "" }
    else {
        return this.name + (env.compress ? ':' : ': ') +
               this.value.toCSS(env) +
               this.important + (this.inline ? "" : ";");
    }
};

tree.Rule.prototype.eval = function (env) {
    var strictMathsBypass = false;
    if (this.name === "font" && env.strictMaths === false) {
        strictMathsBypass = true;
        env.strictMaths = true;
    }
    try {
        return new(tree.Rule)(this.name,
                          this.value.eval(env),
                          this.important,
                          this.index, this.inline);
    }
    finally {
        if (strictMathsBypass) {
            env.strictMaths = false;
        }
    }
};

tree.Rule.prototype.makeImportant = function () {
    return new(tree.Rule)(this.name,
                          this.value,
                          "!important",
                          this.index, this.inline);
};

})(require('../tree'));