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// Encoding documentation: |
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// https://en.wikipedia.org/wiki/Code_39#Encoding |
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class CODE39 { |
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constructor(string, options){ |
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this.string = string.toUpperCase(); |
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// Enable mod43 checksum? |
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this.mod43Enabled = options.mod43 || false; |
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// All characters. The position in the array is the (checksum) value |
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this.characters = [ |
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"0", "1", "2", "3", |
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"4", "5", "6", "7", |
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"8", "9", "A", "B", |
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"C", "D", "E", "F", |
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"G", "H", "I", "J", |
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"K", "L", "M", "N", |
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"O", "P", "Q", "R", |
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"S", "T", "U", "V", |
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"W", "X", "Y", "Z", |
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"-", ".", " ", "$", |
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"/", "+", "%", "*" |
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]; |
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// The decimal representation of the characters, is converted to the |
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// corresponding binary with the getEncoding function |
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this.encodings = [ |
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20957, 29783, 23639, 30485, |
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20951, 29813, 23669, 20855, |
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29789, 23645, 29975, 23831, |
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30533, 22295, 30149, 24005, |
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21623, 29981, 23837, 22301, |
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30023, 23879, 30545, 22343, |
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30161, 24017, 21959, 30065, |
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23921, 22385, 29015, 18263, |
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29141, 17879, 29045, 18293, |
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17783, 29021, 18269, 17477, |
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17489, 17681, 20753, 35770 |
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]; |
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} |
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43
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// Get the binary representation of a character by converting the encodings |
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// from decimal to binary |
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getEncoding(character){ |
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return this.getBinary(this.characterValue(character)); |
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} |
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getBinary(characterValue){ |
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return this.encodings[characterValue].toString(2); |
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} |
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getCharacter(characterValue){ |
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return this.characters[characterValue]; |
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} |
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characterValue(character){ |
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return this.characters.indexOf(character); |
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} |
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encode(){ |
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var string = this.string; |
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// First character is always a * |
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var result = this.getEncoding("*"); |
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// Take every character and add the binary representation to the result |
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for(let i = 0; i < this.string.length; i++){ |
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result += this.getEncoding(this.string[i]) + "0"; |
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} |
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// Calculate mod43 checksum if enabled |
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if(this.mod43Enabled){ |
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var checksum = this.mod43checksum(); |
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result += this.getBinary(checksum) + "0"; |
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string += this.getCharacter(checksum); |
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} |
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// Last character is always a * |
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result += this.getEncoding("*"); |
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return { |
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data: result, |
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text: string |
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}; |
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} |
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valid(){ |
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return this.string.search(/^[0-9A-Z\-\.\ \$\/\+\%]+$/) !== -1; |
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} |
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mod43checksum(){ |
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var checksum = 0; |
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for(let i = 0; i < this.string.length; i++){ |
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checksum += this.characterValue(this.string[i]); |
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} |
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checksum = checksum % 43; |
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return checksum; |
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} |
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} |
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104
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export {CODE39}; |
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lindell /
JsBarcode
