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parse_color.js
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parse_color.js
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'use strict';
const parseColorString = require('csscolorparser').parseCSSColor;
const util = require('../util/util');
const MapboxGLFunction = require('mapbox-gl-function');
const cache = {};
module.exports = function parseColor(input) {
if (input && MapboxGLFunction.isFunctionDefinition(input)) {
if (!input.stops) return input;
else return util.extend({}, input, {
stops: input.stops.map((stop) => {
return [stop[0], parseColor(stop[1])];
})
});
} else if (typeof input === 'string') {
if (!cache[input]) {
const rgba = parseColorString(input);
if (!rgba) { throw new Error(`Invalid color ${input}`); }
// GL expects all components to be in the range [0, 1] and to be
// multipled by the alpha value.
cache[input] = [
rgba[0] / 255 * rgba[3],
rgba[1] / 255 * rgba[3],
rgba[2] / 255 * rgba[3],
rgba[3]
];
}
return cache[input];
} else if (Array.isArray(input)) {
return input;
} else {
throw new Error(`Invalid color ${input}`);
}
};