// This file is part of Indico.
// Copyright (C) 2002 - 2021 CERN
//
// Indico is free software; you can redistribute it and/or
// modify it under the terms of the MIT License; see the
// LICENSE file for more details.

/**
 * Returns true if the text starts with the string.
 * @param {String} text
 * @param {String} string
 * @return {Boolean} result
 */
function startsWith(text, string) {
  return string == text.slice(0, string.length);
}

var specialCharMap = {
  '\b': '\\b',
  '\t': '\\t',
  '\n': '\\n',
  '\f': '\\f',
  '\r': '\\r',
  '\\': '\\\\',
  '"': '\\"',
};

/**
 * Returns escaped string text.
 * @param {String} text
 * @return {String}
 */
function escapeString(text) {
  return (
    '"' +
    text.replace(/[\x00-\x1f\\\"]/g, function(value) {
      if (value in specialCharMap) {
        return specialCharMap[value];
      } else {
        return '\\u00' + zeroPad(value.charCodeAt(0).toString(16), 2);
      }
    }) +
    '"'
  );
}

/**
 * Formats the text using the args.
 * @param {String} text
 * @param {Array, Object} args
 * @return {String}
 */
function format(text, args) {
  return text.replace(/(\{\{)|(\}\})|(\{[^\}]*\})/g, function(string) {
    switch (string) {
      case '{{':
        return '{';
      case '}}':
        return '}';
    }
    if (!exists(args)) {
      return '';
    }
    return str(args[string.slice(1, -1)]);
  });
}

function trim(text) {
  return trimEnd(trimStart(text));
}

function trimStart(text) {
  return text.replace(/^\s+/, '');
}

function trimEnd(text) {
  return text.replace(/\s+$/, '');
}

function padLeft(text, size, character) {
  while (text.length < size) {
    text = character + text;
  }
  return text;
}

function zeroPad(text, size) {
  return padLeft(text, size, '0');
}
