(function(){d3.csv = function(url, callback) {

  d3.text(url, "text/csv", function(text) {

    callback(text && d3.csv.parse(text));

  });

};

d3.csv.parse = function(text) {

  var header;

  return d3.csv.parseRows(text, function(row, i) {

    if (i) {

      var o = {}, j = -1, m = header.length;

      while (++j < m) o[header[j]] = row[j];

      return o;

    } else {

      header = row;

      return null;

    }

  });

};

d3.csv.parseRows = function(text, f) {

  var EOL = {}, // sentinel value for end-of-line

      EOF = {}, // sentinel value for end-of-file

      rows = [], // output rows

      re = /\r\n|[,\r\n]/g, // field separator regex

      n = 0, // the current line number

      t, // the current token

      eol; // is the current token followed by EOL?

  re.lastIndex = 0; // work-around bug in FF 3.6

  /** @private Returns the next token. */

  function token() {

    if (re.lastIndex >= text.length) return EOF; // special case: end of file

    if (eol) { eol = false; return EOL; } // special case: end of line

    // special case: quotes

    var j = re.lastIndex;

    if (text.charCodeAt(j) === 34) {

      var i = j;

      while (i++ < text.length) {

        if (text.charCodeAt(i) === 34) {

          if (text.charCodeAt(i + 1) !== 34) break;

          i++;

        }

      }

      re.lastIndex = i + 2;

      var c = text.charCodeAt(i + 1);

      if (c === 13) {

        eol = true;

        if (text.charCodeAt(i + 2) === 10) re.lastIndex++;

      } else if (c === 10) {

        eol = true;

      }

      return text.substring(j + 1, i).replace(/""/g, "\"");

    }

    // common case

    var m = re.exec(text);

    if (m) {

      eol = m[0].charCodeAt(0) !== 44;

      return text.substring(j, m.index);

    }

    re.lastIndex = text.length;

    return text.substring(j);

  }

  while ((t = token()) !== EOF) {

    var a = [];

    while ((t !== EOL) && (t !== EOF)) {

      a.push(t);

      t = token();

    }

    if (f && !(a = f(a, n++))) continue;

    rows.push(a);

  }

  return rows;

};

d3.csv.format = function(rows) {

  return rows.map(d3_csv_formatRow).join("\n");

};

function d3_csv_formatRow(row) {

  return row.map(d3_csv_formatValue).join(",");

}

function d3_csv_formatValue(text) {

  return /[",\n]/.test(text)

      ? "\"" + text.replace(/\"/g, "\"\"") + "\""

      : text;

}

})();