'use strict';

const nameStartChar = ':A-Za-z_\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02FF\\u0370-\\u037D\\u037F-\\u1FFF\\u200C-\\u200D\\u2070-\\u218F\\u2C00-\\u2FEF\\u3001-\\uD7FF\\uF900-\\uFDCF\\uFDF0-\\uFFFD';
const nameChar = nameStartChar + '\\-.\\d\\u00B7\\u0300-\\u036F\\u203F-\\u2040';
const nameRegexp = '[' + nameStartChar + '][' + nameChar + ']*'
const regexName = new RegExp('^' + nameRegexp + '$');

const getAllMatches = function(string, regex) {
  const matches = [];
  let match = regex.exec(string);
  while (match) {
    const allmatches = [];
    const len = match.length;
    for (let index = 0; index < len; index++) {
      allmatches.push(match[index]);
    }
    matches.push(allmatches);
    match = regex.exec(string);
  }
  return matches;
};

const isName = function(string) {
  const match = regexName.exec(string);
  return !(match === null || typeof match === 'undefined');
};

exports.isExist = function(v) {
  return typeof v !== 'undefined';
};

exports.isEmptyObject = function(obj) {
  return Object.keys(obj).length === 0;
};

/**
 * Copy all the properties of a into b.
 * @param {*} target
 * @param {*} a
 */
exports.merge = function(target, a, arrayMode) {
  if (a) {
    const keys = Object.keys(a); // will return an array of own properties
    const len = keys.length; //don't make it inline
    for (let i = 0; i < len; i++) {
      if (arrayMode === 'strict') {
        target[keys[i]] = [ a[keys[i]] ];
      } else {
        target[keys[i]] = a[keys[i]];
      }
    }
  }
};
/* exports.merge =function (b,a){
  return Object.assign(b,a);
} */

exports.getValue = function(v) {
  if (exports.isExist(v)) {
    return v;
  } else {
    return '';
  }
};

// const fakeCall = function(a) {return a;};
// const fakeCallNoReturn = function() {};

exports.buildOptions = function(options, defaultOptions, props) {
  var newOptions = {};
  if (!options) {
    return defaultOptions; //if there are not options
  }

  for (let i = 0; i < props.length; i++) {
    if (options[props[i]] !== undefined) {
      newOptions[props[i]] = options[props[i]];
    } else {
      newOptions[props[i]] = defaultOptions[props[i]];
    }
  }
  return newOptions;
};

/**
 * Check if a tag name should be treated as array
 *
 * @param tagName the node tagname
 * @param arrayMode the array mode option
 * @param parentTagName the parent tag name
 * @returns {boolean} true if node should be parsed as array
 */
exports.isTagNameInArrayMode = function (tagName, arrayMode, parentTagName) {
  if (arrayMode === false) {
    return false;
  } else if (arrayMode instanceof RegExp) {
    return arrayMode.test(tagName);
  } else if (typeof arrayMode === 'function') {
    return !!arrayMode(tagName, parentTagName);
  }

  return arrayMode === "strict";
}

exports.isName = isName;
exports.getAllMatches = getAllMatches;
exports.nameRegexp = nameRegexp;