Implemented a CSV parser in JavaScript.

tools/csvparser.js

Index: tools/csvparser.js
diff --git a/tools/csvparser.js b/tools/csvparser.js
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+// 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;
+};