tahamajs/IE / Projects /front /node_modules /@zxing /text-encoding /cjs /coders /big5 /Big5Decoder.js
| ; | |
| Object.defineProperty(exports, "__esModule", { value: true }); | |
| var encodings_1 = require("../../encoding/encodings"); | |
| var finished_1 = require("../../encoding/finished"); | |
| var indexes_1 = require("../../encoding/indexes"); | |
| var terminology_1 = require("../../encoding/terminology"); | |
| var utilities_1 = require("../../encoding/utilities"); | |
| /** | |
| * @constructor | |
| * @implements {Decoder} | |
| * @param {{fatal: boolean}} options | |
| */ | |
| var Big5Decoder = /** @class */ (function () { | |
| function Big5Decoder(options) { | |
| this.fatal = options.fatal; | |
| // Big5's decoder has an associated Big5 lead (initially 0x00). | |
| /** @type {number} */ this.Big5_lead = 0x00; | |
| } | |
| /** | |
| * @param {Stream} stream The stream of bytes being decoded. | |
| * @param {number} bite The next byte read from the stream. | |
| * @return {?(number|!Array.<number>)} The next code point(s) | |
| * decoded, or null if not enough data exists in the input | |
| * stream to decode a complete code point. | |
| */ | |
| Big5Decoder.prototype.handler = function (stream, bite) { | |
| // 1. If byte is end-of-stream and Big5 lead is not 0x00, set | |
| // Big5 lead to 0x00 and return error. | |
| if (bite === terminology_1.end_of_stream && this.Big5_lead !== 0x00) { | |
| this.Big5_lead = 0x00; | |
| return encodings_1.decoderError(this.fatal); | |
| } | |
| // 2. If byte is end-of-stream and Big5 lead is 0x00, return | |
| // finished. | |
| if (bite === terminology_1.end_of_stream && this.Big5_lead === 0x00) | |
| return finished_1.finished; | |
| // 3. If Big5 lead is not 0x00, let lead be Big5 lead, let | |
| // pointer be null, set Big5 lead to 0x00, and then run these | |
| // substeps: | |
| if (this.Big5_lead !== 0x00) { | |
| var lead = this.Big5_lead; | |
| var pointer = null; | |
| this.Big5_lead = 0x00; | |
| // 1. Let offset be 0x40 if byte is less than 0x7F and 0x62 | |
| // otherwise. | |
| var offset = bite < 0x7F ? 0x40 : 0x62; | |
| // 2. If byte is in the range 0x40 to 0x7E, inclusive, or 0xA1 | |
| // to 0xFE, inclusive, set pointer to (lead − 0x81) × 157 + | |
| // (byte − offset). | |
| if (utilities_1.inRange(bite, 0x40, 0x7E) || utilities_1.inRange(bite, 0xA1, 0xFE)) | |
| pointer = (lead - 0x81) * 157 + (bite - offset); | |
| // 3. If there is a row in the table below whose first column | |
| // is pointer, return the two code points listed in its second | |
| // column | |
| // Pointer | Code points | |
| // --------+-------------- | |
| // 1133 | U+00CA U+0304 | |
| // 1135 | U+00CA U+030C | |
| // 1164 | U+00EA U+0304 | |
| // 1166 | U+00EA U+030C | |
| switch (pointer) { | |
| case 1133: return [0x00CA, 0x0304]; | |
| case 1135: return [0x00CA, 0x030C]; | |
| case 1164: return [0x00EA, 0x0304]; | |
| case 1166: return [0x00EA, 0x030C]; | |
| } | |
| // 4. Let code point be null if pointer is null and the index | |
| // code point for pointer in index Big5 otherwise. | |
| var code_point = (pointer === null) ? null : | |
| indexes_1.indexCodePointFor(pointer, indexes_1.index('big5')); | |
| // 5. If code point is null and byte is an ASCII byte, prepend | |
| // byte to stream. | |
| if (code_point === null && terminology_1.isASCIIByte(bite)) | |
| stream.prepend(bite); | |
| // 6. If code point is null, return error. | |
| if (code_point === null) | |
| return encodings_1.decoderError(this.fatal); | |
| // 7. Return a code point whose value is code point. | |
| return code_point; | |
| } | |
| // 4. If byte is an ASCII byte, return a code point whose value | |
| // is byte. | |
| if (terminology_1.isASCIIByte(bite)) | |
| return bite; | |
| // 5. If byte is in the range 0x81 to 0xFE, inclusive, set Big5 | |
| // lead to byte and return continue. | |
| if (utilities_1.inRange(bite, 0x81, 0xFE)) { | |
| this.Big5_lead = bite; | |
| return null; | |
| } | |
| // 6. Return error. | |
| return encodings_1.decoderError(this.fatal); | |
| }; | |
| return Big5Decoder; | |
| }()); | |
| exports.Big5Decoder = Big5Decoder; | |
| //# sourceMappingURL=Big5Decoder.js.map |
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