@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
70 lines (69 loc) • 3.25 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ASCIIEncoder = void 0;
var constants_1 = require("./constants");
// tslint:disable-next-line:no-circular-imports
var HighLevelEncoder_1 = require("./HighLevelEncoder");
var ASCIIEncoder = /** @class */ (function () {
function ASCIIEncoder() {
}
ASCIIEncoder.prototype.getEncodingMode = function () {
return constants_1.ASCII_ENCODATION;
};
ASCIIEncoder.prototype.encode = function (context) {
// step B
var n = HighLevelEncoder_1.default.determineConsecutiveDigitCount(context.getMessage(), context.pos);
if (n >= 2) {
context.writeCodeword(this.encodeASCIIDigits(context.getMessage().charCodeAt(context.pos), context.getMessage().charCodeAt(context.pos + 1)));
context.pos += 2;
}
else {
var c = context.getCurrentChar();
var newMode = HighLevelEncoder_1.default.lookAheadTest(context.getMessage(), context.pos, this.getEncodingMode());
if (newMode !== this.getEncodingMode()) {
switch (newMode) {
case constants_1.BASE256_ENCODATION:
context.writeCodeword(constants_1.LATCH_TO_BASE256);
context.signalEncoderChange(constants_1.BASE256_ENCODATION);
return;
case constants_1.C40_ENCODATION:
context.writeCodeword(constants_1.LATCH_TO_C40);
context.signalEncoderChange(constants_1.C40_ENCODATION);
return;
case constants_1.X12_ENCODATION:
context.writeCodeword(constants_1.LATCH_TO_ANSIX12);
context.signalEncoderChange(constants_1.X12_ENCODATION);
break;
case constants_1.TEXT_ENCODATION:
context.writeCodeword(constants_1.LATCH_TO_TEXT);
context.signalEncoderChange(constants_1.TEXT_ENCODATION);
break;
case constants_1.EDIFACT_ENCODATION:
context.writeCodeword(constants_1.LATCH_TO_EDIFACT);
context.signalEncoderChange(constants_1.EDIFACT_ENCODATION);
break;
default:
throw new Error('Illegal mode: ' + newMode);
}
}
else if (HighLevelEncoder_1.default.isExtendedASCII(c)) {
context.writeCodeword(constants_1.UPPER_SHIFT);
context.writeCodeword(c - 128 + 1);
context.pos++;
}
else {
context.writeCodeword(c + 1);
context.pos++;
}
}
};
ASCIIEncoder.prototype.encodeASCIIDigits = function (digit1, digit2) {
if (HighLevelEncoder_1.default.isDigit(digit1) && HighLevelEncoder_1.default.isDigit(digit2)) {
var num = (digit1 - 48) * 10 + (digit2 - 48);
return num + 130;
}
throw new Error('not digits: ' + digit1 + digit2);
};
return ASCIIEncoder;
}());
exports.ASCIIEncoder = ASCIIEncoder;