@zxing/text-encoding
Version:
Polyfill for the Encoding Living Standard's API.
60 lines • 2.56 kB
JavaScript
;
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 {Encoder}
* @param {{fatal: boolean}} options
*/
var EUCJPEncoder = /** @class */ (function () {
function EUCJPEncoder(options) {
this.fatal = options.fatal;
}
/**
* @param {Stream} stream Input stream.
* @param {number} code_point Next code point read from the stream.
* @return {(number|!Array.<number>)} Byte(s) to emit.
*/
EUCJPEncoder.prototype.handler = function (stream, code_point) {
// 1. If code point is end-of-stream, return finished.
if (code_point === terminology_1.end_of_stream)
return finished_1.finished;
// 2. If code point is an ASCII code point, return a byte whose
// value is code point.
if (terminology_1.isASCIICodePoint(code_point))
return code_point;
// 3. If code point is U+00A5, return byte 0x5C.
if (code_point === 0x00A5)
return 0x5C;
// 4. If code point is U+203E, return byte 0x7E.
if (code_point === 0x203E)
return 0x7E;
// 5. If code point is in the range U+FF61 to U+FF9F, inclusive,
// return two bytes whose values are 0x8E and code point −
// 0xFF61 + 0xA1.
if (utilities_1.inRange(code_point, 0xFF61, 0xFF9F))
return [0x8E, code_point - 0xFF61 + 0xA1];
// 6. If code point is U+2212, set it to U+FF0D.
if (code_point === 0x2212)
code_point = 0xFF0D;
// 7. Let pointer be the index pointer for code point in index
// jis0208.
var pointer = indexes_1.indexPointerFor(code_point, indexes_1.index('jis0208'));
// 8. If pointer is null, return error with code point.
if (pointer === null)
return encodings_1.encoderError(code_point);
// 9. Let lead be Math.floor(pointer / 94) + 0xA1.
var lead = Math.floor(pointer / 94) + 0xA1;
// 10. Let trail be pointer % 94 + 0xA1.
var trail = pointer % 94 + 0xA1;
// 11. Return two bytes whose values are lead and trail.
return [lead, trail];
};
return EUCJPEncoder;
}());
exports.EUCJPEncoder = EUCJPEncoder;
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