50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
(function (tree) {
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//
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// A number with a unit
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//
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tree.Dimension = function (value, unit) {
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this.value = parseFloat(value);
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this.unit = unit || null;
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};
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tree.Dimension.prototype = {
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eval: function () { return this },
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toColor: function () {
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return new(tree.Color)([this.value, this.value, this.value]);
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},
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toCSS: function () {
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var css = this.value + this.unit;
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return css;
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},
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// In an operation between two Dimensions,
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// we default to the first Dimension's unit,
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// so `1px + 2em` will yield `3px`.
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// In the future, we could implement some unit
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// conversions such that `100cm + 10mm` would yield
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// `101cm`.
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operate: function (op, other) {
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return new(tree.Dimension)
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(tree.operate(op, this.value, other.value),
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this.unit || other.unit);
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},
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// TODO: Perform unit conversion before comparing
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compare: function (other) {
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if (other instanceof tree.Dimension) {
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if (other.value > this.value) {
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return -1;
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} else if (other.value < this.value) {
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return 1;
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} else {
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return 0;
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}
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} else {
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return -1;
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}
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}
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};
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})(require('../tree'));
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