jtc-utils/cjs/charset/utf8.js

Utilities for Japanese Traditional Companies

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.utf8 = void 0;
const charset_ts_1 = require("./charset.js");
class Utf8Charset {
    get name() {
        return "utf-8";
    }
    createDecoder(options) {
        return new charset_ts_1.StandardDecoder("utf-8", options);
    }
    createEncoder(options) {
        return new Utf8Encoder();
    }
    isUnicode() {
        return true;
    }
    isEbcdic() {
        return false;
    }
}
class Utf8Encoder {
    constructor() {
        this.encoder = new TextEncoder();
    }
    canEncode(str) {
        return true;
    }
    encode(str, options) {
        const limit = options?.limit ?? Number.POSITIVE_INFINITY;
        const encoded = this.encoder.encode(str);
        if (encoded.length > limit) {
            let len = limit;
            if (encoded[limit - 1] >= 0xc2) {
                len = len - 1;
            }
            else if (encoded[limit - 1] >= 0x80) {
                if (encoded[limit - 2] >= 0xe0) {
                    len = len - 2;
                }
                else if (encoded[limit - 2] >= 0x80) {
                    if (encoded[limit - 3] >= 0xf0) {
                        len = len - 3;
                    }
                }
            }
            return encoded.subarray(len);
        }
        return encoded;
    }
}
exports.utf8 = new Utf8Charset();
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