mirror of
https://github.com/less/less.js.git
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29 lines
781 B
JavaScript
29 lines
781 B
JavaScript
(function (tree) {
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tree.Condition = function (op, l, r, i) {
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this.op = op.trim();
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this.lvalue = l;
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this.rvalue = r;
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this.index = i;
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};
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tree.Condition.prototype.eval = function (env) {
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var a = this.lvalue.eval(env),
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b = this.rvalue.eval(env);
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var i = this.index;
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if (a.compare) {
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switch (a.compare(b)) {
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case -1: return this.op === '<' || this.op === '=<' || this.op === '!=';
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case 0: return this.op === '=' || this.op === '>=' || this.op === '=<';
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case 1: return this.op === '>' || this.op === '>=' || this.op === '!=';
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}
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} else {
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throw { type: "Type",
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message: "Unable to perform comparison",
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index: i };
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}
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};
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})(require('../tree'));
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