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(function (tree) {
tree.Expression = function (value) { this.value = value; };
tree.Expression.prototype = {
type: "Expression",
accept: function (visitor) {
this.value = visitor.visit(this.value);
},
eval: function (env) {
var returnValue,
inParenthesis = this.parens && !this.parensInOp,
doubleParen = false;
if (inParenthesis) {
env.inParenthesis();
}
if (this.value.length > 1) {
returnValue = new(tree.Expression)(this.value.map(function (e) {
return e.eval(env);
}));
} else if (this.value.length === 1) {
if (this.value[0].parens && !this.value[0].parensInOp) {
doubleParen = true;
}
returnValue = this.value[0].eval(env);
} else {
returnValue = this;
}
if (inParenthesis) {
env.outOfParenthesis();
}
if (this.parens && this.parensInOp && !(env.isMathsOn()) && !doubleParen) {
returnValue = new(tree.Paren)(returnValue);
}
return returnValue;
},
toCSS: function (env) {
return this.value.map(function (e) {
return e.toCSS ? e.toCSS(env) : '';
}).join(' ');
},
throwAwayComments: function () {
this.value = this.value.filter(function(v) {
return !(v instanceof tree.Comment);
});
}
};
})(require('../tree'));
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