33 lines
832 B
JavaScript
33 lines
832 B
JavaScript
(function(tree) {
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tree.Operation = function(op, operands) {
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this.op = op.trim();
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this.operands = operands;
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};
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tree.Operation.prototype.eval = function(env) {
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var a = this.operands[0].eval(env),
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b = this.operands[1].eval(env),
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temp;
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if (a instanceof tree.Dimension && b instanceof tree.Color) {
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if (this.op === '*' || this.op === '+') {
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temp = b, b = a, a = temp;
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} else {
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throw { name: 'OperationError',
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message: "Can't substract or divide a color from a number" };
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}
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}
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return a.operate(this.op, b);
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};
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tree.operate = function(op, a, b) {
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switch (op) {
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case '+': return a + b;
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case '-': return a - b;
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case '*': return a * b;
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case '/': return a / b;
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}
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};
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})(require('mess/tree'));
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