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 | 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 19x 8x 8x 19x 9x 9x 19x 19x 7x 7x 7x 7x 7x 7x 7x 2x 2x 2x 2x 2x 2x 2x 432x 254x 254x 432x 254x 254x 430x 432x 432x 254x | import { QrNumber } from './number.mode.js'
import { QrAlphaNum } from './alphanum.mode.js'
import { getValidQrKanjiOrNull } from './kanji.mode.js'
import { Qr8BitByte } from './byte.mode.js'
/**
* Create QR code Kanji mode object
* @param {string} data - data of mode object
* @returns {import('./mode-bits.constants.js').ModeObject} get best matching mode
*/
export function getBestMode (data) {
if (/^\d+$/.test(data)) {
return QrNumber(data)
}
if (/^[0-9A-Z $%*+-./:]+$/.test(data)) {
return QrAlphaNum(data)
}
return getValidQrKanjiOrNull(data) ?? Qr8BitByte(data)
}
const LENGTH_BITS_MATRIX = Object.freeze([
10, 12, 14, // MODE_NUMBER
9, 11, 13, // MODE_ALPHA_NUM
8, 16, 16, // MODE_8BIT_BYTE
8, 10, 12, // MODE_KANJI
])
/**
* @param {number} mode - mode value
* @param {number} version - qr version
* @returns {number} the number of bits in character count indicator
*/
export function getCharCountBitLength (mode, version) {
if (!(version >= 1 && version < 41)) {
throw Error(`invalid version: ${version}`)
}
if (mode < 1 || mode > 8 || (mode & (mode - 1))) {
throw Error(`invalid mode: ${mode}`)
}
const modeIndex = 31 - Math.clz32(mode)
const bitsIndex = version > 26 ? 2 : version > 9 ? 1 : 0
return LENGTH_BITS_MATRIX[modeIndex * 3 + bitsIndex]
};
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