# All files / csv2json/libs/core rowSplit.js

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     var getDelimiter = require("./getDelimiter");
    var filterRow=require("./filterRow");
    /**
     * Convert a line of string to csv columns according to its delimiter
     * the param._header may not be ready when this is called.
     * @param  {[type]} rowStr [description]
     * @param  {[type]} param  [Converter param]
     * @return {[type]}        {cols:["a","b","c"],closed:boolean} the closed field indicate if the row is a complete row
     */
    module.exports = function rowSplit(rowStr, param) {
      if (rowStr === "") {
        return { cols: [], closed: true };
      }
      var quote = param.quote;
      var trim = param.trim;
      var escape = param.escape;
      if (param.delimiter instanceof Array || param.delimiter.toLowerCase() === "auto") {
        param.delimiter = getDelimiter(rowStr, param);
      }
      var delimiter = param.delimiter;
      var rowArr = rowStr.split(delimiter);
      if (quote === "off") {
        return { cols: rowArr, closed: true };
      }
      var row = [];
      var inquote = false;
      var quoteBuff = '';
      for (var i = 0, rowLen = rowArr.length; i < rowLen; i++) {
        var e = rowArr[i];
        if (!inquote && trim) {
          e = e.trim();
        }
        var len = e.length;
        if (!inquote) {
          if (isQuoteOpen(e, param)) { //quote open
            e = e.substr(1);
            if (isQuoteClose(e, param)) { //quote close
              e = e.substring(0, e.length - 1);
              e = _escapeQuote(e, quote, escape);
              row.push(e);
              continue;
            } else {
              inquote = true;
              quoteBuff += e;
              continue;
            }
          } else {
            row.push(e);
            continue;
          }
        } else { //previous quote not closed
          if (isQuoteClose(e, param)) { //close double quote
            inquote = false;
            e = e.substr(0, len - 1);
            quoteBuff += delimiter + e;
            quoteBuff = _escapeQuote(quoteBuff, quote, escape);
            if (trim) {
              quoteBuff = quoteBuff.trimRight();
            }
            row.push(quoteBuff);
            quoteBuff = "";
          } else {
            quoteBuff += delimiter + e;
          }
        }
      }

      if (!inquote && param._needFilterRow) {
        row = filterRow(row, param);
      }

      return { cols: row, closed: !inquote };
      // if (param.workerNum<=1){
      // }else{
      //   if (inquote && quoteBuff.length>0){//for multi core, quote will be closed at the end of line
      //     quoteBuff=_escapeQuote(quoteBuff,quote,escape);;
      //     if (trim){
      //       quoteBuff=quoteBuff.trimRight();
      //     }
      //     row.push(quoteBuff);
      //   }
      //   return {cols:row,closed:true};
      // }

    };

    function isQuoteOpen(str, param) {
      var quote = param.quote;
      var escape = param.escape;
      return str[0] === quote && (
        str[1] !== quote ||
        str[1] === escape && (str[2] === quote || str.length === 2));
    }
    function isQuoteClose(str, param) {
      var quote = param.quote;
      var count = 0;
      var idx = str.length - 1;
      var escape = param.escape;
      while (str[idx] === quote || str[idx] === escape) {
        idx--;
        count++;
      }
      return count % 2 !== 0;
    }

    function twoDoubleQuote(str, quote) {
      var twoQuote = quote + quote;
      var curIndex = -1;
      while ((curIndex = str.indexOf(twoQuote, curIndex)) > -1) {
        str = str.substring(0, curIndex) + str.substring(++curIndex);
      }
      return str;
    }

    var cachedRegExp = {};
    function _escapeQuote(segment, quote, escape) {

      var key = "es|" + quote + "|" + escape;
      if (cachedRegExp[key] === undefined) {

        // if (escape === "\\") {
        //   escape = "\\\\";
        // }
        cachedRegExp[key] = new RegExp('\\'+escape + '\\'+quote, 'g');
      }
      var regExp = cachedRegExp[key];
      // console.log(regExp,segment);
      return segment.replace(regExp, quote);
    }