77 lines
1.8 KiB
JavaScript
77 lines
1.8 KiB
JavaScript
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const canPromise = require('./can-promise')
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const QRCode = require('./core/qrcode')
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const CanvasRenderer = require('./renderer/canvas')
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const SvgRenderer = require('./renderer/svg-tag.js')
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function renderCanvas (renderFunc, canvas, text, opts, cb) {
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const args = [].slice.call(arguments, 1)
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const argsNum = args.length
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const isLastArgCb = typeof args[argsNum - 1] === 'function'
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if (!isLastArgCb && !canPromise()) {
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throw new Error('Callback required as last argument')
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}
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if (isLastArgCb) {
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if (argsNum < 2) {
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throw new Error('Too few arguments provided')
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}
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if (argsNum === 2) {
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cb = text
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text = canvas
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canvas = opts = undefined
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} else if (argsNum === 3) {
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if (canvas.getContext && typeof cb === 'undefined') {
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cb = opts
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opts = undefined
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} else {
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cb = opts
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opts = text
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text = canvas
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canvas = undefined
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}
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}
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} else {
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if (argsNum < 1) {
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throw new Error('Too few arguments provided')
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}
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if (argsNum === 1) {
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text = canvas
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canvas = opts = undefined
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} else if (argsNum === 2 && !canvas.getContext) {
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opts = text
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text = canvas
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canvas = undefined
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}
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return new Promise(function (resolve, reject) {
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try {
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const data = QRCode.create(text, opts)
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resolve(renderFunc(data, canvas, opts))
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} catch (e) {
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reject(e)
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}
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})
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}
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try {
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const data = QRCode.create(text, opts)
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cb(null, renderFunc(data, canvas, opts))
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} catch (e) {
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cb(e)
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}
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}
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exports.create = QRCode.create
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exports.toCanvas = renderCanvas.bind(null, CanvasRenderer.render)
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exports.toDataURL = renderCanvas.bind(null, CanvasRenderer.renderToDataURL)
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// only svg for now.
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exports.toString = renderCanvas.bind(null, function (data, _, opts) {
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return SvgRenderer.render(data, opts)
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})
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