univ-conv/lib/converters/TextConverter.js

The universal binary and text converter

import { _, AbstractConverter } from "./AbstractConverter";
import { deleteStartLength, getStartEnd, hasNoStartLength, } from "./core";
import { getTextHelper } from "./StringUtil";
export class TextConverter extends AbstractConverter {
    constructor() {
        super(...arguments);
        this.type = "text";
    }
    empty() {
        return "";
    }
    is(input, options) {
        return typeof input === "string" && options.inputStringType === "text";
    }
    async _from(input, options) {
        const converter = _()._find(input, options);
        return await converter.toText(input, options);
    }
    async _getStartEnd(input, options) {
        const size = await this.size(input, options);
        return getStartEnd(options, size);
    }
    _isEmpty(input) {
        return !input;
    }
    _merge(chunks) {
        return Promise.resolve(chunks.join(""));
    }
    async _size(input, options) {
        const u8 = await this._toUint8Array(input, deleteStartLength(options));
        return u8.byteLength;
    }
    async _toArrayBuffer(input, options) {
        const u8 = await this._toUint8Array(input, options);
        return u8.buffer.slice(u8.byteOffset, u8.byteOffset + u8.byteLength);
    }
    async _toBase64(input, options) {
        const u8 = await this._toUint8Array(input, options);
        return await _()._of("uint8array").toBase64(u8, deleteStartLength(options));
    }
    async _toText(input, options) {
        if (options.bufferToTextCharset === options.textToBufferCharset &&
            hasNoStartLength(options)) {
            return input;
        }
        const u8 = await this._toUint8Array(input, options);
        const textHelper = await getTextHelper();
        return await textHelper.bufferToText(u8, options);
    }
    async _toUint8Array(input, options) {
        const textHelper = await getTextHelper();
        return await textHelper.textToBuffer(input, options);
    }
}
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