Leanplum-JavaScript-SDK/src/ValueTransforms.ts at develop · Leanplum/Leanplum-JavaScript-SDK · GitHub

40 lines (34 loc) · 1.15 KB

export default class ValueTransforms {

public static decodeColor(color: number): string {

const b = color & 0xff; color >>= 8

const g = color & 0xff; color >>= 8

const r = color & 0xff; color >>= 8

const a = (color & 0xff) / 255

return `rgba(${r},${g},${b},${a})`

}

public static encodeColor(color: string | number): number {

if (typeof color === 'number') {

return color

}

// rgba -> number

const rgbaRe = /^rgba$(\d+),(\d+),(\d+),(\d+(\.\d+)?)$$/

const rgba = rgbaRe.exec(color)

if (rgba) {

const a = parseInt(rgba[4], 10) * 255

const r = parseInt(rgba[1], 10) & 0xff

const g = parseInt(rgba[2], 10) & 0xff

const b = parseInt(rgba[3], 10) & 0xff

return (a << 24) + (r << 16) + (g << 8) + b

}

// hex -> number

const hexRe = /^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i

const hex = hexRe.exec(color)

if (hex) {

const r = parseInt(hex[1], 16) & 0xff

const g = parseInt(hex[2], 16) & 0xff

const b = parseInt(hex[3], 16) & 0xff

return (255 << 24) + (r << 16) + (g << 8) + b

}

throw new Error(`Could not parse color "${color}"`)

}

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