@cantoo/pdf-lib/es/core/objects/PDFString.js

Create and modify PDF files with JavaScript

import PDFObject from './PDFObject.js';
import CharCodes from '../syntax/CharCodes.js';
import { copyStringIntoBuffer, padStart, utf16Decode, pdfDocEncodingDecode, toCharCode, parseDate, hasUtf16BOM, } from '../../utils/index.js';
import { InvalidPDFDateStringError } from '../errors.js';
class PDFString extends PDFObject {
    constructor(value) {
        super();
        this.value = value;
    }
    asBytes() {
        const bytes = [];
        let octal = '';
        let escaped = false;
        const pushByte = (byte) => {
            if (byte !== undefined)
                bytes.push(byte);
            escaped = false;
        };
        for (let idx = 0, len = this.value.length; idx < len; idx++) {
            const char = this.value[idx];
            const byte = toCharCode(char);
            const nextChar = this.value[idx + 1];
            if (!escaped) {
                if (byte === CharCodes.BackSlash)
                    escaped = true;
                else
                    pushByte(byte);
            }
            else {
                if (byte === CharCodes.Newline)
                    pushByte();
                else if (byte === CharCodes.CarriageReturn)
                    pushByte();
                else if (byte === CharCodes.n)
                    pushByte(CharCodes.Newline);
                else if (byte === CharCodes.r)
                    pushByte(CharCodes.CarriageReturn);
                else if (byte === CharCodes.t)
                    pushByte(CharCodes.Tab);
                else if (byte === CharCodes.b)
                    pushByte(CharCodes.Backspace);
                else if (byte === CharCodes.f)
                    pushByte(CharCodes.FormFeed);
                else if (byte === CharCodes.LeftParen)
                    pushByte(CharCodes.LeftParen);
                else if (byte === CharCodes.RightParen)
                    pushByte(CharCodes.RightParen);
                else if (byte === CharCodes.Backspace)
                    pushByte(CharCodes.BackSlash);
                else if (byte >= CharCodes.Zero && byte <= CharCodes.Seven) {
                    octal += char;
                    if (octal.length === 3 || !(nextChar >= '0' && nextChar <= '7')) {
                        pushByte(parseInt(octal, 8));
                        octal = '';
                    }
                }
                else {
                    pushByte(byte);
                }
            }
        }
        return new Uint8Array(bytes);
    }
    decodeText() {
        const bytes = this.asBytes();
        if (hasUtf16BOM(bytes))
            return utf16Decode(bytes);
        return pdfDocEncodingDecode(bytes);
    }
    decodeDate() {
        const text = this.decodeText();
        const date = parseDate(text);
        if (!date)
            throw new InvalidPDFDateStringError(text);
        return date;
    }
    asString() {
        return this.value;
    }
    clone() {
        return PDFString.of(this.value);
    }
    toString() {
        return `(${this.value})`;
    }
    sizeInBytes() {
        return this.value.length + 2;
    }
    copyBytesInto(buffer, offset) {
        buffer[offset++] = CharCodes.LeftParen;
        offset += copyStringIntoBuffer(this.value, buffer, offset);
        buffer[offset++] = CharCodes.RightParen;
        return this.value.length + 2;
    }
}
// The PDF spec allows newlines and parens to appear directly within a literal
// string. These character _may_ be escaped. But they do not _have_ to be. So
// for simplicity, we will not bother escaping them.
PDFString.of = (value) => new PDFString(value);
PDFString.fromDate = (date) => {
    const year = padStart(String(date.getUTCFullYear()), 4, '0');
    const month = padStart(String(date.getUTCMonth() + 1), 2, '0');
    const day = padStart(String(date.getUTCDate()), 2, '0');
    const hours = padStart(String(date.getUTCHours()), 2, '0');
    const mins = padStart(String(date.getUTCMinutes()), 2, '0');
    const secs = padStart(String(date.getUTCSeconds()), 2, '0');
    return new PDFString(`D:${year}${month}${day}${hours}${mins}${secs}Z`);
};
export default PDFString;
//# sourceMappingURL=PDFString.js.map