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

Library for creating and modifying PDF files in JavaScript

import { PDFNumber } 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 Number.
 *
 * If so, returns a tuple containing (1) an object representing the parsed PDF
 * Number and (2) a subarray of the input with the characters making up the parsed
 * number removed. The "onParseNumber" parse handler will also be called with the
 * parsed PDFNumber object.
 *
 * If not, null is returned.
 */
var parseNumber = function (input, _a) {
    var onParseNumber = (_a === void 0 ? {} : _a).onParseNumber;
    var trimmed = trimArrayAndRemoveComments(input);
    var numRegex = /^(([+-]?\d+(\.\d+)?)|([+-]?\.\d+))/;
    // Search for the first character that isn't part of a number
    var idx = 0;
    while (String.fromCharCode(trimmed[idx]).match(/^[+-.\d]/))
        idx += 1;
    // Try to match the regex up to that character to see if we've got a number
    var result = arrayToString(trimmed, 0, idx).match(numRegex);
    if (!result)
        return undefined;
    var fullMatch = result[0], num = result[1];
    var pdfNumber = PDFNumber.fromString(num);
    if (onParseNumber)
        onParseNumber(pdfNumber);
    return [pdfNumber, trimmed.subarray(fullMatch.length)];
};
export default parseNumber;