// Copyright 2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


// Initlialize namespaces.
var devtools = devtools || {};
devtools.profiler = devtools.profiler || {};


/**
 * Creates a CSV lines parser.
 */
devtools.profiler.CsvParser = function() {
};


/**
 * A regex for matching a trailing quote.
 * @private
 */
devtools.profiler.CsvParser.TRAILING_QUOTE_RE_ = /\"$/;


/**
 * A regex for matching a double quote.
 * @private
 */
devtools.profiler.CsvParser.DOUBLE_QUOTE_RE_ = /\"\"/g;


/**
 * Parses a line of CSV-encoded values. Returns an array of fields.
 *
 * @param {string} line Input line.
 */
devtools.profiler.CsvParser.prototype.parseLine = function(line) {
  var insideQuotes = false;
  var fields = [];
  var prevPos = 0;
  for (var i = 0, n = line.length; i < n; ++i) {
    switch (line.charAt(i)) {
      case ',':
        if (!insideQuotes) {
          fields.push(line.substring(prevPos, i));
          prevPos = i + 1;
        }
        break;
      case '"':
        if (!insideQuotes) {
          insideQuotes = true;
          // Skip the leading quote.
          prevPos++;
        } else {
          if (i + 1 < n && line.charAt(i + 1) != '"') {
            insideQuotes = false;
          } else {
            i++;
          }
        }
        break;
    }
  }
  if (n > 0) {
    fields.push(line.substring(prevPos));
  }

  for (i = 0; i < fields.length; ++i) {
    // Eliminate trailing quotes.
    fields[i] = fields[i].replace(devtools.profiler.CsvParser.TRAILING_QUOTE_RE_, '');
    // Convert quoted quotes into single ones.
    fields[i] = fields[i].replace(devtools.profiler.CsvParser.DOUBLE_QUOTE_RE_, '"');
  }
  return fields;
};