@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
216 lines (215 loc) • 9.33 kB
JavaScript
"use strict";
/**
* Set of CharsetEncoders for a given input string
*
* Invariants:
* - The list contains only encoders from CharacterSetECI (list is shorter then the list of encoders available on
* the platform for which ECI values are defined).
* - The list contains encoders at least one encoder for every character in the input.
* - The first encoder in the list is always the ISO-8859-1 encoder even of no character in the input can be encoded
* by it.
* - If the input contains a character that is not in ISO-8859-1 then the last two entries in the list will be the
* UTF-8 encoder and the UTF-16BE encoder.
*
* @author Alex Geller
*/
var __values = (this && this.__values) || function(o) {
var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
if (m) return m.call(o);
if (o && typeof o.length === "number") return {
next: function () {
if (o && i >= o.length) o = void 0;
return { value: o && o[i++], done: !o };
}
};
throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ECIEncoderSet = void 0;
var Charset_1 = require("../util/Charset");
var StandardCharsets_1 = require("../util/StandardCharsets");
var StringEncoding_1 = require("../util/StringEncoding");
var StringUtils_1 = require("./StringUtils");
var CharsetEncoder = /** @class */ (function () {
function CharsetEncoder(charset) {
this.charset = charset;
this.name = charset.name;
}
CharsetEncoder.prototype.canEncode = function (c) {
try {
return StringEncoding_1.default.encode(c, this.charset) != null;
}
catch (ex) {
return false;
}
};
return CharsetEncoder;
}());
var ECIEncoderSet = /** @class */ (function () {
/**
* Constructs an encoder set
*
* @param stringToEncode the string that needs to be encoded
* @param priorityCharset The preferred {@link Charset} or null.
* @param fnc1 fnc1 denotes the character in the input that represents the FNC1 character or -1 for a non-GS1 bar
* code. When specified, it is considered an error to pass it as argument to the methods canEncode() or encode().
*/
function ECIEncoderSet(stringToEncode, priorityCharset, fnc1) {
var e_1, _a, e_2, _b, e_3, _c;
this.ENCODERS = [
'IBM437',
'ISO-8859-2',
'ISO-8859-3',
'ISO-8859-4',
'ISO-8859-5',
'ISO-8859-6',
'ISO-8859-7',
'ISO-8859-8',
'ISO-8859-9',
'ISO-8859-10',
'ISO-8859-11',
'ISO-8859-13',
'ISO-8859-14',
'ISO-8859-15',
'ISO-8859-16',
'windows-1250',
'windows-1251',
'windows-1252',
'windows-1256',
'Shift_JIS',
].map(function (name) { return new CharsetEncoder(Charset_1.default.forName(name)); });
this.encoders = [];
var neededEncoders = [];
// we always need the ISO-8859-1 encoder. It is the default encoding
neededEncoders.push(new CharsetEncoder(StandardCharsets_1.default.ISO_8859_1));
var needUnicodeEncoder = priorityCharset != null && priorityCharset.name.startsWith('UTF');
// Walk over the input string and see if all characters can be encoded with the list of encoders
for (var i = 0; i < stringToEncode.length; i++) {
var canEncode = false;
try {
for (var neededEncoders_1 = (e_1 = void 0, __values(neededEncoders)), neededEncoders_1_1 = neededEncoders_1.next(); !neededEncoders_1_1.done; neededEncoders_1_1 = neededEncoders_1.next()) {
var encoder = neededEncoders_1_1.value;
var singleCharacter = stringToEncode.charAt(i);
var c = singleCharacter.charCodeAt(0);
if (c === fnc1 || encoder.canEncode(singleCharacter)) {
canEncode = true;
break;
}
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (neededEncoders_1_1 && !neededEncoders_1_1.done && (_a = neededEncoders_1.return)) _a.call(neededEncoders_1);
}
finally { if (e_1) throw e_1.error; }
}
if (!canEncode) {
try {
// for the character at position i we don't yet have an encoder in the list
for (var _d = (e_2 = void 0, __values(this.ENCODERS)), _e = _d.next(); !_e.done; _e = _d.next()) {
var encoder = _e.value;
if (encoder.canEncode(stringToEncode.charAt(i))) {
// Good, we found an encoder that can encode the character. We add him to the list and continue scanning
// the input
neededEncoders.push(encoder);
canEncode = true;
break;
}
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (_e && !_e.done && (_b = _d.return)) _b.call(_d);
}
finally { if (e_2) throw e_2.error; }
}
}
if (!canEncode) {
// The character is not encodeable by any of the single byte encoders so we remember that we will need a
// Unicode encoder.
needUnicodeEncoder = true;
}
}
if (neededEncoders.length === 1 && !needUnicodeEncoder) {
// the entire input can be encoded by the ISO-8859-1 encoder
this.encoders = [neededEncoders[0]];
}
else {
// we need more than one single byte encoder or we need a Unicode encoder.
// In this case we append a UTF-8 and UTF-16 encoder to the list
this.encoders = [];
var index = 0;
try {
for (var neededEncoders_2 = __values(neededEncoders), neededEncoders_2_1 = neededEncoders_2.next(); !neededEncoders_2_1.done; neededEncoders_2_1 = neededEncoders_2.next()) {
var encoder = neededEncoders_2_1.value;
this.encoders[index++] = encoder;
}
}
catch (e_3_1) { e_3 = { error: e_3_1 }; }
finally {
try {
if (neededEncoders_2_1 && !neededEncoders_2_1.done && (_c = neededEncoders_2.return)) _c.call(neededEncoders_2);
}
finally { if (e_3) throw e_3.error; }
}
// this.encoders[index] = new CharsetEncoder(StandardCharsets.UTF_8);
// this.encoders[index + 1] = new CharsetEncoder(StandardCharsets.UTF_16BE);
}
// Compute priorityEncoderIndex by looking up priorityCharset in encoders
var priorityEncoderIndexValue = -1;
if (priorityCharset != null) {
for (var i = 0; i < this.encoders.length; i++) {
if (this.encoders[i] != null &&
priorityCharset.name === this.encoders[i].name) {
priorityEncoderIndexValue = i;
break;
}
}
}
this.priorityEncoderIndex = priorityEncoderIndexValue;
// invariants
// if(this?.encoders?.[0].name !== StandardCharsets.ISO_8859_1)){
// throw new Error("ISO-8859-1 must be the first encoder");
// }
}
ECIEncoderSet.prototype.length = function () {
return this.encoders.length;
};
ECIEncoderSet.prototype.getCharsetName = function (index) {
if (!(index < this.length())) {
throw new Error('index must be less than length');
}
return this.encoders[index].name;
};
ECIEncoderSet.prototype.getCharset = function (index) {
if (!(index < this.length())) {
throw new Error('index must be less than length');
}
return this.encoders[index].charset;
};
ECIEncoderSet.prototype.getECIValue = function (encoderIndex) {
return this.encoders[encoderIndex].charset.getValueIdentifier();
};
/*
* returns -1 if no priority charset was defined
*/
ECIEncoderSet.prototype.getPriorityEncoderIndex = function () {
return this.priorityEncoderIndex;
};
ECIEncoderSet.prototype.canEncode = function (c, encoderIndex) {
if (!(encoderIndex < this.length())) {
throw new Error('index must be less than length');
}
return true;
};
ECIEncoderSet.prototype.encode = function (c, encoderIndex) {
if (!(encoderIndex < this.length())) {
throw new Error('index must be less than length');
}
return StringEncoding_1.default.encode(StringUtils_1.default.getCharAt(c), this.encoders[encoderIndex].name);
};
return ECIEncoderSet;
}());
exports.ECIEncoderSet = ECIEncoderSet;