Icard/angular-clarity-master(work.../node_modules/qrcode/lib/server.js

139 lines
3.5 KiB
JavaScript

const canPromise = require('./can-promise')
const QRCode = require('./core/qrcode')
const PngRenderer = require('./renderer/png')
const Utf8Renderer = require('./renderer/utf8')
const TerminalRenderer = require('./renderer/terminal')
const SvgRenderer = require('./renderer/svg')
function checkParams (text, opts, cb) {
if (typeof text === 'undefined') {
throw new Error('String required as first argument')
}
if (typeof cb === 'undefined') {
cb = opts
opts = {}
}
if (typeof cb !== 'function') {
if (!canPromise()) {
throw new Error('Callback required as last argument')
} else {
opts = cb || {}
cb = null
}
}
return {
opts: opts,
cb: cb
}
}
function getTypeFromFilename (path) {
return path.slice((path.lastIndexOf('.') - 1 >>> 0) + 2).toLowerCase()
}
function getRendererFromType (type) {
switch (type) {
case 'svg':
return SvgRenderer
case 'txt':
case 'utf8':
return Utf8Renderer
case 'png':
case 'image/png':
default:
return PngRenderer
}
}
function getStringRendererFromType (type) {
switch (type) {
case 'svg':
return SvgRenderer
case 'terminal':
return TerminalRenderer
case 'utf8':
default:
return Utf8Renderer
}
}
function render (renderFunc, text, params) {
if (!params.cb) {
return new Promise(function (resolve, reject) {
try {
const data = QRCode.create(text, params.opts)
return renderFunc(data, params.opts, function (err, data) {
return err ? reject(err) : resolve(data)
})
} catch (e) {
reject(e)
}
})
}
try {
const data = QRCode.create(text, params.opts)
return renderFunc(data, params.opts, params.cb)
} catch (e) {
params.cb(e)
}
}
exports.create = QRCode.create
exports.toCanvas = require('./browser').toCanvas
exports.toString = function toString (text, opts, cb) {
const params = checkParams(text, opts, cb)
const type = params.opts ? params.opts.type : undefined
const renderer = getStringRendererFromType(type)
return render(renderer.render, text, params)
}
exports.toDataURL = function toDataURL (text, opts, cb) {
const params = checkParams(text, opts, cb)
const renderer = getRendererFromType(params.opts.type)
return render(renderer.renderToDataURL, text, params)
}
exports.toBuffer = function toBuffer (text, opts, cb) {
const params = checkParams(text, opts, cb)
const renderer = getRendererFromType(params.opts.type)
return render(renderer.renderToBuffer, text, params)
}
exports.toFile = function toFile (path, text, opts, cb) {
if (typeof path !== 'string' || !(typeof text === 'string' || typeof text === 'object')) {
throw new Error('Invalid argument')
}
if ((arguments.length < 3) && !canPromise()) {
throw new Error('Too few arguments provided')
}
const params = checkParams(text, opts, cb)
const type = params.opts.type || getTypeFromFilename(path)
const renderer = getRendererFromType(type)
const renderToFile = renderer.renderToFile.bind(null, path)
return render(renderToFile, text, params)
}
exports.toFileStream = function toFileStream (stream, text, opts) {
if (arguments.length < 2) {
throw new Error('Too few arguments provided')
}
const params = checkParams(text, opts, stream.emit.bind(stream, 'error'))
const renderer = getRendererFromType('png') // Only png support for now
const renderToFileStream = renderer.renderToFileStream.bind(null, stream)
render(renderToFileStream, text, params)
}