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import Barcode from "../Barcode.js"; |
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import { SHIFT, SET_A, SET_B, MODULO, STOP, SET_BY_CODE, SWAP, BARS } from './constants'; |
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// This is the master class, |
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// it does require the start code to be included in the string |
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class CODE128 extends Barcode { |
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constructor(data, options) { |
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super(data.substring(1), options); |
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// Get array of ascii codes from data |
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this.bytes = data.split('') |
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.map(char => char.charCodeAt(0)); |
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} |
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valid() { |
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// ASCII value ranges 0-127, 200-211 |
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return /^[\x00-\x7F\xC8-\xD3]+$/.test(this.data); |
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} |
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// The public encoding function |
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encode() { |
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const bytes = this.bytes; |
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// Remove the start code from the bytes and set its index |
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const startIndex = bytes.shift() - 105; |
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// Get start set by index |
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const startSet = SET_BY_CODE[startIndex]; |
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if (startSet === undefined) { |
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throw new RangeError('The encoding does not start with a start character.'); |
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} |
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// Start encode with the right type |
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const encodingResult = CODE128.next(bytes, 1, startSet); |
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return { |
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text: |
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this.text === this.data |
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? this.text.replace(/[^\x20-\x7E]/g, '') |
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: this.text, |
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data: |
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// Add the start bits |
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CODE128.getBar(startIndex) + |
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// Add the encoded bits |
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encodingResult.result + |
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// Add the checksum |
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CODE128.getBar((encodingResult.checksum + startIndex) % MODULO) + |
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// Add the end bits |
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CODE128.getBar(STOP) |
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}; |
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} |
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// Get a bar symbol by index |
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static getBar(index) { |
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return BARS[index] ? BARS[index].toString() : ''; |
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} |
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// Correct an index by a set and shift it from the bytes array |
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static correctIndex(bytes, set) { |
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if (set === SET_A) { |
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const charCode = bytes.shift(); |
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return charCode < 32 ? charCode + 64 : charCode - 32; |
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} else if (set === SET_B) { |
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return bytes.shift() - 32; |
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} else { |
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return (bytes.shift() - 48) * 10 + bytes.shift() - 48; |
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} |
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} |
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static next(bytes, pos, set) { |
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if (!bytes.length) { |
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return { result: '', checksum: 0 }; |
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} |
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let nextCode, index; |
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// Special characters |
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if (bytes[0] >= 200){ |
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index = bytes.shift() - 105; |
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const nextSet = SWAP[index]; |
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// Swap to other set |
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if (nextSet !== undefined) { |
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nextCode = CODE128.next(bytes, pos + 1, nextSet); |
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} |
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// Continue on current set but encode a special character |
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else { |
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// Shift |
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if ((set === SET_A || set === SET_B) && index === SHIFT) { |
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// Convert the next character so that is encoded correctly |
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bytes[0] = (set === SET_A) |
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? bytes[0] > 95 ? bytes[0] - 96 : bytes[0] |
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: bytes[0] < 32 ? bytes[0] + 96 : bytes[0]; |
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} |
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nextCode = CODE128.next(bytes, pos + 1, set); |
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} |
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} |
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// Continue encoding |
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else { |
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index = CODE128.correctIndex(bytes, set); |
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nextCode = CODE128.next(bytes, pos + 1, set); |
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} |
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// Get the correct binary encoding and calculate the weight |
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const enc = CODE128.getBar(index); |
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const weight = index * pos; |
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return { |
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result: enc + nextCode.result, |
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checksum: weight + nextCode.checksum |
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}; |
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} |
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} |
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114
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export default CODE128; |
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lindell /
JsBarcode
