@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
216 lines (215 loc) • 9.14 kB
JavaScript
;
/*
* Copyright 2009 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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 });
var DecodeHintType_1 = require("./DecodeHintType");
var BarcodeFormat_1 = require("./BarcodeFormat");
var QRCodeReader_1 = require("./qrcode/QRCodeReader");
var AztecReader_1 = require("./aztec/AztecReader");
var MultiFormatOneDReader_1 = require("./oned/MultiFormatOneDReader");
var DataMatrixReader_1 = require("./datamatrix/DataMatrixReader");
var NotFoundException_1 = require("./NotFoundException");
var PDF417Reader_1 = require("./pdf417/PDF417Reader");
var ReaderException_1 = require("./ReaderException");
/*namespace com.google.zxing {*/
/**
* MultiFormatReader is a convenience class and the main entry point into the library for most uses.
* By default it attempts to decode all barcode formats that the library supports. Optionally, you
* can provide a hints object to request different behavior, for example only decoding QR codes.
*
* @author Sean Owen
* @author dswitkin@google.com (Daniel Switkin)
*/
var MultiFormatReader = /** @class */ (function () {
function MultiFormatReader() {
}
/**
* This version of decode honors the intent of Reader.decode(BinaryBitmap) in that it
* passes null as a hint to the decoders. However, that makes it inefficient to call repeatedly.
* Use setHints() followed by decodeWithState() for continuous scan applications.
*
* @param image The pixel data to decode
* @return The contents of the image
*
* @throws NotFoundException Any errors which occurred
*/
/*@Override*/
// public decode(image: BinaryBitmap): Result {
// setHints(null)
// return decodeInternal(image)
// }
/**
* Decode an image using the hints provided. Does not honor existing state.
*
* @param image The pixel data to decode
* @param hints The hints to use, clearing the previous state.
* @return The contents of the image
*
* @throws NotFoundException Any errors which occurred
*/
/*@Override*/
MultiFormatReader.prototype.decode = function (image, hints) {
this.setHints(hints);
return this.decodeInternal(image);
};
/**
* Decode an image using the state set up by calling setHints() previously. Continuous scan
* clients will get a <b>large</b> speed increase by using this instead of decode().
*
* @param image The pixel data to decode
* @return The contents of the image
*
* @throws NotFoundException Any errors which occurred
*/
MultiFormatReader.prototype.decodeWithState = function (image) {
// Make sure to set up the default state so we don't crash
if (this.readers === null || this.readers === undefined) {
this.setHints(null);
}
return this.decodeInternal(image);
};
/**
* This method adds state to the MultiFormatReader. By setting the hints once, subsequent calls
* to decodeWithState(image) can reuse the same set of readers without reallocating memory. This
* is important for performance in continuous scan clients.
*
* @param hints The set of hints to use for subsequent calls to decode(image)
*/
MultiFormatReader.prototype.setHints = function (hints) {
this.hints = hints;
var tryHarder = hints !== null && hints !== undefined && undefined !== hints.get(DecodeHintType_1.default.TRY_HARDER);
/*@SuppressWarnings("unchecked")*/
var formats = hints === null || hints === undefined ? null : hints.get(DecodeHintType_1.default.POSSIBLE_FORMATS);
var readers = new Array();
if (formats !== null && formats !== undefined) {
var addOneDReader = formats.some(function (f) {
return f === BarcodeFormat_1.default.UPC_A ||
f === BarcodeFormat_1.default.UPC_E ||
f === BarcodeFormat_1.default.EAN_13 ||
f === BarcodeFormat_1.default.EAN_8 ||
f === BarcodeFormat_1.default.CODABAR ||
f === BarcodeFormat_1.default.CODE_39 ||
f === BarcodeFormat_1.default.CODE_93 ||
f === BarcodeFormat_1.default.CODE_128 ||
f === BarcodeFormat_1.default.ITF ||
f === BarcodeFormat_1.default.RSS_14 ||
f === BarcodeFormat_1.default.RSS_EXPANDED;
});
// Put 1D readers upfront in "normal" mode
// TYPESCRIPTPORT: TODO: uncomment below as they are ported
if (addOneDReader && !tryHarder) {
readers.push(new MultiFormatOneDReader_1.default(hints));
}
if (formats.includes(BarcodeFormat_1.default.QR_CODE)) {
readers.push(new QRCodeReader_1.default());
}
if (formats.includes(BarcodeFormat_1.default.DATA_MATRIX)) {
readers.push(new DataMatrixReader_1.default());
}
if (formats.includes(BarcodeFormat_1.default.AZTEC)) {
readers.push(new AztecReader_1.default());
}
if (formats.includes(BarcodeFormat_1.default.PDF_417)) {
readers.push(new PDF417Reader_1.default());
}
// if (formats.includes(BarcodeFormat.MAXICODE)) {
// readers.push(new MaxiCodeReader())
// }
// At end in "try harder" mode
if (addOneDReader && tryHarder) {
readers.push(new MultiFormatOneDReader_1.default(hints));
}
}
if (readers.length === 0) {
if (!tryHarder) {
readers.push(new MultiFormatOneDReader_1.default(hints));
}
readers.push(new QRCodeReader_1.default());
readers.push(new DataMatrixReader_1.default());
readers.push(new AztecReader_1.default());
readers.push(new PDF417Reader_1.default());
// readers.push(new MaxiCodeReader())
if (tryHarder) {
readers.push(new MultiFormatOneDReader_1.default(hints));
}
}
this.readers = readers; // .toArray(new Reader[readers.size()])
};
/*@Override*/
MultiFormatReader.prototype.reset = function () {
var e_1, _a;
if (this.readers !== null) {
try {
for (var _b = __values(this.readers), _c = _b.next(); !_c.done; _c = _b.next()) {
var reader = _c.value;
reader.reset();
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
}
finally { if (e_1) throw e_1.error; }
}
}
};
/**
* @throws NotFoundException
*/
MultiFormatReader.prototype.decodeInternal = function (image) {
var e_2, _a;
if (this.readers === null) {
throw new ReaderException_1.default('No readers where selected, nothing can be read.');
}
try {
for (var _b = __values(this.readers), _c = _b.next(); !_c.done; _c = _b.next()) {
var reader = _c.value;
// Trying to decode with ${reader} reader.
try {
return reader.decode(image, this.hints);
}
catch (ex) {
if (ex instanceof ReaderException_1.default) {
continue;
}
// Bad Exception.
}
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
}
finally { if (e_2) throw e_2.error; }
}
throw new NotFoundException_1.default('No MultiFormat Readers were able to detect the code.');
};
return MultiFormatReader;
}());
exports.default = MultiFormatReader;