pdf-lib/es/core/pdf-parser/parseBool.js

Library for creating and modifying PDF files in JavaScript

import { PDFBoolean } from '../pdf-objects';
import { arrayToString, trimArrayAndRemoveComments } from '../../utils';
/**
 * Accepts an array of bytes as input. Checks to see if the first characters in
 * the trimmed input make up a PDF Boolean.
 *
 * If so, returns a tuple containing (1) an object representing the parsed
 * PDF Boolean and (2) a subarray of the input with the characters making up the
 * parsed header removed. The "onParseBool" parse handler will also be called
 * with the PDFBoolean object.
 *
 * If not, null is returned.
 */
var parseBool = function (input, _a) {
    var onParseBool = (_a === void 0 ? {} : _a).onParseBool;
    var trimmed = trimArrayAndRemoveComments(input);
    var boolRegex = /^(?:[\0\t\n\f\r ]*)(true|false)((?=[\0\t\n\f\r \]]))?/;
    // Search for first character that isn't part of a boolean
    var idx = 0;
    while (String.fromCharCode(trimmed[idx]).match(/^[\0\t\n\f\r truefalse]/) &&
        idx < trimmed.length) {
        idx += 1;
    }
    // Try to match the regex up to that character to see if we've got a boolean
    var result = arrayToString(trimmed, 0, idx).match(boolRegex);
    if (!result)
        return undefined;
    var fullMatch = result[0], bool = result[1];
    var pdfBool = PDFBoolean.fromString(bool);
    if (onParseBool)
        onParseBool(pdfBool);
    return [pdfBool, trimmed.subarray(fullMatch.length)];
};
export default parseBool;