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Directory : /var/app/comcon24/cms/node_modules/qrcode.vue/src/

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Current File : /var/app/comcon24/cms/node_modules/qrcode.vue/src/index.js

import QRCode from 'qr.js/lib/QRCode'
import ErrorCorrectLevel from 'qr.js/lib/ErrorCorrectLevel'

/**
 * Encode UTF16 to UTF8.
 * See: http://jonisalonen.com/2012/from-utf-16-to-utf-8-in-javascript/
 * @param str {string}
 * @returns {string}
 */
function toUTF8String(str) {
  let utf8Str = ''
  for (let i = 0; i < str.length; i++) {
    let charCode = str.charCodeAt(i)
    if (charCode < 0x0080) {
      utf8Str += String.fromCharCode(charCode)
    } else if (charCode < 0x0800) {
      utf8Str += String.fromCharCode(0xc0 | (charCode >> 6))
      utf8Str += String.fromCharCode(0x80 | (charCode & 0x3f))
    } else if (charCode < 0xd800 || charCode >= 0xe000) {
      utf8Str += String.fromCharCode(0xe0 | (charCode >> 12))
      utf8Str += String.fromCharCode(0x80 | ((charCode >> 6) & 0x3f))
      utf8Str += String.fromCharCode(0x80 | (charCode & 0x3f))
    } else {
      // surrogate pair
      i++
      // UTF-16 encodes 0x10000-0x10FFFF by
      // subtracting 0x10000 and splitting the
      // 20 bits of 0x0-0xFFFFF into two halves
      charCode =
        0x10000 + (((charCode & 0x3ff) << 10) | (str.charCodeAt(i) & 0x3ff))
      utf8Str += String.fromCharCode(0xf0 | (charCode >> 18))
      utf8Str += String.fromCharCode(0x80 | ((charCode >> 12) & 0x3f))
      utf8Str += String.fromCharCode(0x80 | ((charCode >> 6) & 0x3f))
      utf8Str += String.fromCharCode(0x80 | (charCode & 0x3f))
    }
  }
  return utf8Str
}

function generatePath(modules, margin = 0) {
  const ops = []
  modules.forEach(function(row, y) {
    let start = null
    row.forEach(function(cell, x) {
      if (!cell && start !== null) {
        // M0 0h7v1H0z injects the space with the move and drops the comma,
        // saving a char per operation
        ops.push(
          `M${start + margin} ${y + margin}h${x - start}v1H${start + margin}z`
        )
        start = null
        return
      }

      // end of row, clean up or skip
      if (x === row.length - 1) {
        if (!cell) {
          // We would have closed the op above already so this can only mean
          // 2+ light modules in a row.
          return
        }
        if (start === null) {
          // Just a single dark module.
          ops.push(`M${x + margin},${y + margin} h1v1H${x + margin}z`)
        } else {
          // Otherwise finish the current line.
          ops.push(
            `M${start + margin},${y + margin} h${x + 1 - start}v1H${start +
              margin}z`
          )
        }
        return
      }

      if (cell && start === null) {
        start = x
      }
    })
  })
  return ops.join('')
}

// @vue/component
const QrcodeVue = {
  props: {
    value: {
      type: String,
      required: true,
      default: '',
    },
    className: {
      type: String,
      default: '',
    },
    size: {
      type: [Number, String],
      default: 100,
      validator: (s) => isNaN(Number(s)) !== true,
    },
    level: {
      type: String,
      default: 'L',
      validator: (l) => ['L', 'Q', 'M', 'H'].indexOf(l) > -1,
    },
    background: {
      type: String,
      default: '#fff',
    },
    foreground: {
      type: String,
      default: '#000',
    },
    renderAs: {
      type: String,
      required: false,
      default: 'canvas',
      validator: (as) => ['canvas', 'svg'].indexOf(as) > -1,
    },
  },
  data() {
    return {
      numCells: 0,
      fgPath: '',
    }
  },
  updated() {
    this.render()
  },
  mounted() {
    this.render()
  },
  methods: {
    render() {
      const { value, size, level, background, foreground, renderAs } = this
      const _size = size >>> 0 // size to number

      // We'll use type===-1 to force QRCode to automatically pick the best type
      const qrCode = new QRCode(-1, ErrorCorrectLevel[level])
      qrCode.addData(toUTF8String(value))
      qrCode.make()

      const cells = qrCode.modules
      const tileW = _size / cells.length
      const tileH = _size / cells.length
      const scale = window.devicePixelRatio || 1

      if (renderAs === 'svg') {
        this.numCells = cells.length

        // Drawing strategy: instead of a rect per module, we're going to create a
        // single path for the dark modules and layer that on top of a light rect,
        // for a total of 2 DOM nodes. We pay a bit more in string concat but that's
        // way faster than DOM ops.
        // For level 1, 441 nodes -> 2
        // For level 40, 31329 -> 2
        this.fgPath = generatePath(cells);
      } else {
        const canvas = this.$refs['qrcode-vue']
        const ctx = canvas.getContext('2d')

        canvas.height = canvas.width = _size * scale
        ctx.scale(scale, scale)

        cells.forEach(function(row, rdx) {
          row.forEach(function(cell, cdx) {
            ctx.fillStyle = cell ? foreground : background
            const w = Math.ceil((cdx + 1) * tileW) - Math.floor(cdx * tileW)
            const h = Math.ceil((rdx + 1) * tileH) - Math.floor(rdx * tileH)
            ctx.fillRect(Math.round(cdx * tileW), Math.round(rdx * tileH), w, h)
          })
        })
      }
    },
  },
  render(createElement) {
    const {
      className,
      value,
      level,
      background,
      foreground,
      size,
      renderAs,
      numCells,
      fgPath,
    } = this

    return createElement(
      'div',
      {
        class: this.class || className,
        attrs: { value, level, background, foreground },
      },
      [
        renderAs === 'svg'
          ? createElement(
              'svg',
              {
                attrs: {
                  height: size,
                  width: size,
                  shapeRendering: 'crispEdges',
                  viewBox: `0 0 ${numCells} ${numCells}`,
                },
                style: { width: size + 'px', height: size + 'px' },
              },
              [
                createElement('path', {
                  attrs: {
                    fill: background,
                    d: `M0,0 h${numCells}v${numCells}H0z`,
                  },
                }),
                createElement('path', {
                  attrs: { fill: foreground, d: fgPath },
                }),
              ]
            )
          : createElement(
              'canvas',
              {
                attrs: { height: size, width: size },
                style: { width: size + 'px', height: size + 'px' },
                ref: 'qrcode-vue',
              },
              []
            ),
      ]
    )
  },
}

export default QrcodeVue

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