[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

components/autofill/core/common/autofill_util_unittest.cc

+// Copyright 2015 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 "components/autofill/core/common/autofill_util.h"
+
+#include "base/command_line.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/autofill/core/common/autofill_switches.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace autofill {
+
+// Tests for IsContentsPrefixOfSuggestionToken().
+TEST(AutofillUtilTest, IsContentsPrefixOfSuggestionToken) {
+  EXPECT_FALSE(IsContentsPrefixOfSuggestionToken(

[vabr (Chromium), 2015/04/01 11:33:00]

nit: Please add a comment like:
// IsContentsPrefixOfSuggestionToken should not work yet without a flag.

[Pritam Nikam, 2015/04/01 12:59:37]

Done.

+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("a"), false));
+
+  // Token matching is currently behind a flag.
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
+      autofill::switches::kEnableSuggestionsWithSubstringMatch);
+
+  EXPECT_TRUE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("a"), false));
+  EXPECT_TRUE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("b"), false));
+  EXPECT_TRUE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("Ab"), false));
+  EXPECT_FALSE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("Ab"), true));
+  EXPECT_TRUE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("cd"), true));
+  EXPECT_FALSE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("d"), false));
+  EXPECT_FALSE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("b@"), true));
+  EXPECT_FALSE(IsContentsPrefixOfSuggestionToken(
+      base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("cd.b"), false));
+  EXPECT_FALSE(IsContentsPrefixOfSuggestionToken(
+      base::string16(), base::ASCIIToUTF16("ab"), false));
+  EXPECT_FALSE(IsContentsPrefixOfSuggestionToken(
+      base::string16(), base::ASCIIToUTF16("ab"), true));
+  EXPECT_TRUE(IsContentsPrefixOfSuggestionToken(base::ASCIIToUTF16("ab"),
+                                                base::string16(), false));
+  EXPECT_TRUE(IsContentsPrefixOfSuggestionToken(base::ASCIIToUTF16("ab"),
+                                                base::string16(), true));
+}
+
+// Tests for ComputeRange().
+TEST(AutofillUtilTest, ComputeRange) {
+  const struct {
+    base::string16 field_suggestion;
+    base::string16 field_contents;
+    size_t expected_offset;
+    size_t expected_start;
+    size_t expected_end;
+  } test_cases[] = {
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("a"), 0, 1, 7},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("Ab"), 0, 2, 7},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("cd"), 3, 5, 7},
+      {base::ASCIIToUTF16("ab@cd.b"),
+       base::ASCIIToUTF16("dc"),
+       base::string16::npos,
+       0,
+       0},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("ab@c"), 0, 4, 7},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("cd.b"), 3, 7, 7},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("b"), 6, 7, 7},
+      {base::ASCIIToUTF16("ba.a.ab"), base::ASCIIToUTF16("a.a"), 3, 6, 7},
+      {base::ASCIIToUTF16("texample@example.com"),
+       base::ASCIIToUTF16("example"),
+       9,
+       16,
+       20},
+      {base::ASCIIToUTF16("texample@exam.com"),
+       base::ASCIIToUTF16("example"),
+       base::string16::npos,
+       0,
+       0}};
+
+  for (size_t i = 0; i < arraysize(test_cases); ++i) {
+    SCOPED_TRACE(testing::Message()
+                 << "suggestion = " << test_cases[i].field_suggestion
+                 << ", contents = " << test_cases[i].field_contents);
+
+    size_t start = 0;
+    size_t end = 0;
+    size_t offset = ComputeRange(test_cases[i].field_suggestion,
+                                 test_cases[i].field_contents, &start, &end);
+    EXPECT_EQ(test_cases[i].expected_offset, offset);
+    if (base::string16::npos != offset) {
+      EXPECT_EQ(test_cases[i].expected_start, start);
+      EXPECT_EQ(test_cases[i].expected_end, end);
+    }
+  }
+}
+
+}  // autofill