fullwidth/lib/index.js

Fullwidth text converter.

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _dakuten = require('./dakuten');

var _dakuten2 = _interopRequireDefault(_dakuten);

var _handakuten = require('./handakuten');

var _handakuten2 = _interopRequireDefault(_handakuten);

var _fullwidth = require('./fullwidth');

var _fullwidth2 = _interopRequireDefault(_fullwidth);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var dakuten = 'ﾞ';
var handakuten = 'ﾟ';

function charMapToCodesMap(charMap) {
  return Object.keys(charMap).reduce(function (map, key) {
    map[key.charCodeAt()] = charMap[key].charCodeAt();
    return map;
  }, {});
}

var dakutenCodesMap = charMapToCodesMap(_dakuten2.default);
var handakutenCodesMap = charMapToCodesMap(_handakuten2.default);
var codesMap = charMapToCodesMap(_fullwidth2.default);

exports.default = function (str) {
  var res = '';

  for (var i = 0; i < str.length; i++) {
    var code = str[i].charCodeAt();
    var fullwidthCode = void 0;
    var mark = str[i + 1];

    if (mark === dakuten) {
      fullwidthCode = dakutenCodesMap[code];
    } else if (mark === handakuten) {
      fullwidthCode = handakutenCodesMap[code];
    }

    if (fullwidthCode) {
      i++;
    } else {
      fullwidthCode = codesMap[code];
    }

    res += fullwidthCode ? String.fromCharCode(fullwidthCode) : str[i];
  }

  return res;
};