v8/tools/csvparser.js

// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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// 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;
};