Implemented a CSV parser in JavaScript.

Review URL: http://codereview.chromium.org/67253

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1740 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/tools/csvparser.js

+// 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.
+
+// Load CSV parser implementation from <project root>/tools.
+// Files: tools/csvparser.js
+
+var parser = new devtools.profiler.CsvParser();
+
+assertEquals(
+    [],
+    parser.parseLine(''));
+
+assertEquals(
+    ['', ''],
+    parser.parseLine(','));
+
+assertEquals(
+    ['1997','Ford','E350'],
+    parser.parseLine('1997,Ford,E350'));
+
+assertEquals(
+    ['1997','Ford','E350'],
+    parser.parseLine('"1997","Ford","E350"'));
+
+assertEquals(
+    ['1997','Ford','E350','Super, luxurious truck'],
+    parser.parseLine('1997,Ford,E350,"Super, luxurious truck"'));
+
+assertEquals(
+    ['1997','Ford','E350','Super "luxurious" truck'],
+    parser.parseLine('1997,Ford,E350,"Super ""luxurious"" truck"'));
+
+assertEquals(
+    ['1997','Ford','E350','Super "luxurious" "truck"'],
+    parser.parseLine('1997,Ford,E350,"Super ""luxurious"" ""truck"""'));
+
+assertEquals(
+    ['1997','Ford','E350','Super "luxurious""truck"'],
+    parser.parseLine('1997,Ford,E350,"Super ""luxurious""""truck"""'));
+
+assertEquals(
+    ['shared-library','/lib/ld-2.3.6.so','0x489a2000','0x489b7000'],
+    parser.parseLine('shared-library,"/lib/ld-2.3.6.so",0x489a2000,0x489b7000'));
+
+assertEquals(
+    ['code-creation','LazyCompile','0xf6fe2d20','1201','APPLY_PREPARE native runtime.js:165'],
+    parser.parseLine('code-creation,LazyCompile,0xf6fe2d20,1201,"APPLY_PREPARE native runtime.js:165"'));
+
+assertEquals(
+    ['code-creation','LazyCompile','0xf6fe4bc0','282',' native v8natives.js:69'],
+    parser.parseLine('code-creation,LazyCompile,0xf6fe4bc0,282," native v8natives.js:69"'));
+
+assertEquals(
+    ['code-creation','RegExp','0xf6c21c00','826','NccyrJroXvg\\/([^,]*)'],
+    parser.parseLine('code-creation,RegExp,0xf6c21c00,826,"NccyrJroXvg\\/([^,]*)"'));

tools/csvparser.js

+// 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;
+};