Implement query translation from GData WAPI to Drive API v2.

chrome/browser/google_apis/drive_api_util_unittest.cc

Index: chrome/browser/google_apis/drive_api_util_unittest.cc
diff --git a/chrome/browser/google_apis/drive_api_util_unittest.cc b/chrome/browser/google_apis/drive_api_util_unittest.cc
index 0577c6c106496ebfc70c4e183895c41492be847b..b97f8a5f313cb1c955d3d23f74e539eabbde54f0 100644
--- a/chrome/browser/google_apis/drive_api_util_unittest.cc
+++ b/chrome/browser/google_apis/drive_api_util_unittest.cc
@@ -16,6 +16,25 @@ TEST(DriveApiUtilTest, 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"));

[hashimoto, 2013/04/18 10:37:16]

What are the desired output for the following cases? (quotes are not to clarify)
 - => not fullText contains '', or <empty string>
 "" => fullText contains '', or <empty string>

Also, can we have test cases for the following cases?
 -"dog cat" => not fullText contains 'dog cat'
 -"" => not fullText contains '', or <empty string>

[hidehiko, 2013/04/18 12:05:54]

Good point. Handled quoted text with a leading hyphen-minus, and ignored empty
tokens.

+}
+
 }  // namespace util
 }  // namespace drive
 }  // namespace google_apis