@react-navigation/core/lib/module/queryString.js

Core utilities for building navigators

"use strict";

// Match complete UTF-8 sequences so malformed input can be decoded partially
// without repeatedly splitting and retrying an arbitrarily long byte sequence.
const ENCODED_UTF8 = new RegExp(['%[0-7][\\dA-F]', '%(?:C[2-9A-F]|D[\\dA-F])%[89AB][\\dA-F]', '%E0%[AB][\\dA-F]%[89AB][\\dA-F]', '%E[1-9A-CEF](?:%[89AB][\\dA-F]){2}', '%ED%[89][\\dA-F]%[89AB][\\dA-F]', '%F0%[9AB][\\dA-F](?:%[89AB][\\dA-F]){2}', '%F[1-3](?:%[89AB][\\dA-F]){3}', '%F4%8[\\dA-F](?:%[89AB][\\dA-F]){2}'].join('|'), 'gi');
const decode = value => {
  if (!value.includes('%')) {
    return value;
  }
  try {
    return decodeURIComponent(value);
  } catch {
    return value.replace(ENCODED_UTF8, sequence => decodeURIComponent(sequence));
  }
};
const encode = value => {
  if (/^[A-Za-z0-9_.~-]*$/.test(value)) {
    return value;
  }
  return encodeURIComponent(value).replace(/[!'()*]/g, char => `%${char.charCodeAt(0).toString(16).toUpperCase()}`);
};
export function parse(query) {
  const params = Object.create(null);
  query = query.trim().replace(/^[?#&]/, '');
  let start = 0;
  while (start < query.length) {
    if (query[start] === '&') {
      start++;
      continue;
    }
    const end = query.indexOf('&', start);
    const index = end === -1 ? query.length : end;
    const part = query.slice(start, index).replace(/\+/g, ' ');
    const separator = part.indexOf('=');
    const key = decode(separator === -1 ? part : part.slice(0, separator));
    const value = separator === -1 ? null : decode(part.slice(separator + 1));
    const previous = params[key];
    if (previous === undefined) {
      params[key] = value;
    } else if (Array.isArray(previous)) {
      previous.push(value);
    } else {
      params[key] = [previous, value];
    }
    start = index + 1;
  }
  return params;
}
export function stringify(params) {
  const parts = [];
  for (const [key, value] of Object.entries(params)) {
    if (Array.isArray(value)) {
      let encodedKey;
      value.forEach(item => {
        encodedKey ??= encode(key);
        parts.push(`${encodedKey}=${encode(item)}`);
      });
      continue;
    }
    const encodedKey = encode(key);
    if (value === null) {
      if (encodedKey) {
        parts.push(encodedKey);
      }
    } else {
      parts.push(`${encodedKey}=${encode(value)}`);
    }
  }
  return parts.join('&');
}
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