Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | 1x 1x 1x 1x 1x 1x 1x 1x 3x 3x 3x 3x 3x 1x 1x 1x 1x 1x 1x 3x 3x 3x 3x 54x 54x 54x 54x 54x 3x 3x 3x 3x 3x 1x 1x 1x 1x 1x 1x 1x 1x 1x 111x 111x 81x 111x 9x 30x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 111x | import { MODE_ALPHA_NUM } from './mode-bits.constants.js'
/**
* Create QR code alphanumeric mode object
* @param {string} data - data of mode object
* @returns {import('./mode-bits.constants.js').ModeObject} created mode object
*/
export const QrAlphaNum = (data) => Object.freeze({
data,
mode: MODE_ALPHA_NUM,
length: data.length,
write: writeDataToBitBuffer.bind(null, data),
})
/**
* Writes alphanumeric data to bit buffer that will be used to generate the QR code
* @param {string} data - QrAlphaNum mode object data
* @param {import("./../utils/qr-bit-buffer.js").QrBitBuffer} buffer - target bit buffer
*/
function writeDataToBitBuffer (data, buffer) {
let i = 0
while (i + 1 < data.length) {
buffer.put(
getCode(data.charAt(i)) * 45 +
getCode(data.charAt(i + 1)), 11)
i += 2
}
if (i < data.length) {
buffer.put(getCode(data.charAt(i)), 6)
}
}
const zeroCodePoint = /** @type {number} */('0'.codePointAt(0))
const capitalACodePoint = /** @type {number} */('A'.codePointAt(0))
/**
* Get value for character `c`
* @param {string} c - target character
* @returns {number} character code point
*/
function getCode (c) {
if (c >= '0' && c <= '9') {
return /** @type {number} */(c.codePointAt(0)) - zeroCodePoint
} else if (c >= 'A' && c <= 'Z') {
return /** @type {number} */(c.codePointAt(0)) - capitalACodePoint + 10
} else {
switch (c) {
case ' ' : return 36
case '$' : return 37
case '%' : return 38
case '*' : return 39
case '+' : return 40
case '-' : return 41
case '.' : return 42
case '/' : return 43
case ':' : return 44
default :
throw Error(`illegal char: ${c}`)
}
}
}
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