86 lines
2.3 KiB
JavaScript
86 lines
2.3 KiB
JavaScript
const backgroundWhite = '\x1b[47m'
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const backgroundBlack = '\x1b[40m'
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const foregroundWhite = '\x1b[37m'
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const foregroundBlack = '\x1b[30m'
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const reset = '\x1b[0m'
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const lineSetupNormal = backgroundWhite + foregroundBlack // setup colors
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const lineSetupInverse = backgroundBlack + foregroundWhite // setup colors
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const createPalette = function (lineSetup, foregroundWhite, foregroundBlack) {
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return {
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// 1 ... white, 2 ... black, 0 ... transparent (default)
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'00': reset + ' ' + lineSetup,
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'01': reset + foregroundWhite + '▄' + lineSetup,
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'02': reset + foregroundBlack + '▄' + lineSetup,
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10: reset + foregroundWhite + '▀' + lineSetup,
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11: ' ',
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12: '▄',
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20: reset + foregroundBlack + '▀' + lineSetup,
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21: '▀',
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22: '█'
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}
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}
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/**
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* Returns code for QR pixel
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* @param {boolean[][]} modules
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* @param {number} size
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* @param {number} x
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* @param {number} y
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* @return {'0' | '1' | '2'}
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*/
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const mkCodePixel = function (modules, size, x, y) {
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const sizePlus = size + 1
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if ((x >= sizePlus) || (y >= sizePlus) || (y < -1) || (x < -1)) return '0'
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if ((x >= size) || (y >= size) || (y < 0) || (x < 0)) return '1'
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const idx = (y * size) + x
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return modules[idx] ? '2' : '1'
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}
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/**
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* Returns code for four QR pixels. Suitable as key in palette.
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* @param {boolean[][]} modules
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* @param {number} size
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* @param {number} x
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* @param {number} y
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* @return {keyof palette}
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*/
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const mkCode = function (modules, size, x, y) {
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return (
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mkCodePixel(modules, size, x, y) +
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mkCodePixel(modules, size, x, y + 1)
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)
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}
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exports.render = function (qrData, options, cb) {
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const size = qrData.modules.size
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const data = qrData.modules.data
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const inverse = !!(options && options.inverse)
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const lineSetup = options && options.inverse ? lineSetupInverse : lineSetupNormal
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const white = inverse ? foregroundBlack : foregroundWhite
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const black = inverse ? foregroundWhite : foregroundBlack
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const palette = createPalette(lineSetup, white, black)
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const newLine = reset + '\n' + lineSetup
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let output = lineSetup // setup colors
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for (let y = -1; y < size + 1; y += 2) {
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for (let x = -1; x < size; x++) {
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output += palette[mkCode(data, size, x, y)]
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}
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output += palette[mkCode(data, size, size, y)] + newLine
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}
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output += reset
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if (typeof cb === 'function') {
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cb(null, output)
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}
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return output
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}
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