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

Library for creating and modifying PDF files in JavaScript

import parseDict from './parseDict';
import parseStream from './parseStream';
/**
 * Accepts an array of bytes as input. Checks to see if the first characters in the
 * trimmed input make up a PDF Dictionary. Then checks if the subsequent characters
 * make up a PDF Stream.
 *
 * If a PDFDictionary is found, but no PDFStream, then the dictionary is returned.
 * If a PDFStream is also found, then it is instead returned. The second argument
 * of the returned tuple contains a subarray of the input with the characters
 * making up the parsed object removed.
 *
 * If no PDFDictionary is found at all, null is returned.
 */
var parseDictOrStream = function (input, index, parseHandlers) {
    if (parseHandlers === void 0) { parseHandlers = {}; }
    // Attempt to parse a dictionary
    var dictMatch = parseDict(input, index, parseHandlers);
    if (!dictMatch)
        return undefined;
    var dict = dictMatch[0], r = dictMatch[1];
    // Attempt to parse a stream next
    var streamMatch = parseStream(r, dict, index, parseHandlers);
    // Return stream if one was parsed, otherwise return the dictionary
    if (streamMatch)
        return streamMatch;
    return [dict, r];
};
export default parseDictOrStream;