Implement query translation from GData WAPI to Drive API v2.

chrome/browser/google_apis/drive_api_util_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/google_apis/drive_api_util.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace google_apis {
 namespace drive {
 namespace util {
 
 TEST(DriveApiUtilTest, EscapeQueryStringValue) {
   EXPECT_EQ("abcde", EscapeQueryStringValue("abcde"));
   EXPECT_EQ("\\'", EscapeQueryStringValue("'"));
   EXPECT_EQ("\\'abcde\\'", EscapeQueryStringValue("'abcde'"));
 }
 
+TEST(DriveApiUtilTest, TranslateQuery) {
+  EXPECT_EQ("", TranslateQuery(""));
+  EXPECT_EQ("fullText contains 'dog'", TranslateQuery("dog"));
+  EXPECT_EQ("fullText contains 'dog' and fullText contains 'cat'",
+            TranslateQuery("dog cat"));
+  EXPECT_EQ("not fullText contains 'cat'", TranslateQuery("-cat"));
+  EXPECT_EQ("fullText contains 'dog cat'", TranslateQuery("\"dog cat\""));
+
+  // Should handles full-width white space correctly.
+  // Note: \xE3\x80\x80 (\u3000) is Ideographic Space (a.k.a. Japanese
+  //   full-width whitespace).
+  EXPECT_EQ("fullText contains 'dog' and fullText contains 'cat'",
+            TranslateQuery("dog" "\xE3\x80\x80" "cat"));
+
+  // If the quoted token is not closed (i.e. the last '"' is missing),
+  // we handle the remaining string is one token, as a fallback.
+  EXPECT_EQ("fullText contains 'dog cat'", TranslateQuery("\"dog cat"));
+
+  // For quoted text with leading '-'.
+  EXPECT_EQ("not fullText contains 'dog cat'", TranslateQuery("-\"dog cat\""));
+
+  // Empty tokens should be simply ignored.
+  EXPECT_EQ("", TranslateQuery("-"));
+  EXPECT_EQ("", TranslateQuery("\"\""));
+  EXPECT_EQ("", TranslateQuery("-\"\""));
+  EXPECT_EQ("", TranslateQuery("\"\"\"\""));
+  EXPECT_EQ("", TranslateQuery("\"\" \"\""));
+  EXPECT_EQ("fullText contains 'dog'", TranslateQuery("\"\" dog \"\""));
+}
+
 }  // namespace util
 }  // namespace drive
 }  // namespace google_apis