Implementation of a Matching strategy for URLs in the Declarative WebRequest API.

chrome/browser/extensions/api/declarative/substring_set_matcher_unittest.cc

+// Copyright (c) 2012 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/extensions/api/declarative/substring_set_matcher.h"
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+using namespace extensions;
+
+// Basic tests of SubstringPattern objects
+TEST(SubstringSetMatcherTest, SubstringPattern) {
+  SubstringPattern r1("Test", 2);
+  EXPECT_EQ("Test", r1.pattern());
+  EXPECT_EQ(2, r1.id());
+  EXPECT_EQ(r1, r1);
+
+  SubstringPattern r2(r1);
+  EXPECT_EQ("Test", r2.pattern());
+  EXPECT_EQ(2, r2.id());
+  EXPECT_EQ(r1, r2);
+  EXPECT_EQ(r2, r1);
+
+  SubstringPattern r3("Foo", 3);
+  r3 = r2;
+  EXPECT_EQ("Test", r3.pattern());
+  EXPECT_EQ(2, r3.id());
+  EXPECT_EQ(r2, r3);
+  EXPECT_EQ(r3, r2);
+}
+
+namespace {
+void TestOnePattern(const std::string& test_string,
+                    const std::string& pattern,
+                    bool is_match) {
+  std::vector<SubstringPattern> patterns;
+  patterns.push_back(SubstringPattern(pattern, 1));
+  SubstringSetMatcher matcher;
+  matcher.RegisterPatterns(patterns);
+  std::set<int> matches;
+  matcher.Match(test_string, &matches);
+
+  size_t expected_matches = (is_match ? 1 : 0);
+  EXPECT_EQ(expected_matches, matches.size());
+  EXPECT_EQ(is_match, matches.find(1) != matches.end());
+}
+
+void TestTwoPatterns(const std::string& test_string,
+                     const std::string& pattern_1,
+                     const std::string& pattern_2,
+                     bool is_match_1,
+                     bool is_match_2) {
+  // In order to make sure that the order in which patterns are registered
+  // does not make any difference we try both permutations.
+  for (int permutation = 0; permutation < 2; ++permutation) {
+    std::vector<SubstringPattern> patterns;
+    if (permutation == 0) {
+      patterns.push_back(SubstringPattern(pattern_1, 1));
+      patterns.push_back(SubstringPattern(pattern_2, 2));
+    } else {
+      patterns.push_back(SubstringPattern(pattern_2, 2));
+      patterns.push_back(SubstringPattern(pattern_1, 1));
+    }
+    SubstringSetMatcher matcher;
+    matcher.RegisterPatterns(patterns);
+    std::set<int> matches;
+    matcher.Match(test_string, &matches);
+
+    size_t expected_matches = (is_match_1 ? 1 : 0) + (is_match_2 ? 1 : 0);
+    EXPECT_EQ(expected_matches, matches.size());
+    EXPECT_EQ(is_match_1, matches.find(1) != matches.end());
+    EXPECT_EQ(is_match_2, matches.find(2) != matches.end());
+  }
+}
+}
+
+TEST(SubstringSetMatcherTest, TestMatcher) {
+  // Test overlapping patterns
+  // String    abcde
+  // Pattern 1  bc
+  // Pattern 2   cd
+  TestTwoPatterns("abcde", "bc", "cd", true, true);
+
+  // Test subpatterns - part 1
+  // String    abcde
+  // Pattern 1  bc
+  // Pattern 2  b
+  TestTwoPatterns("abcde", "bc", "b", true, true);
+
+  // Test subpatterns - part 2
+  // String    abcde
+  // Pattern 1  bc
+  // Pattern 2   c
+  TestTwoPatterns("abcde", "bc", "c", true, true);
+
+  // Test identical matches
+  // String    abcde
+  // Pattern 1 abcde
+  TestOnePattern("abcde", "abcde", true);
+
+  // Test multiple matches
+  // String    aaaaa
+  // Pattern 1 a
+  TestOnePattern("abcde", "a", true);
+
+  // Test matches at beginning and end
+  // String    abcde
+  // Pattern 1 ab
+  // Pattern 2    de
+  TestTwoPatterns("abcde", "ab", "de", true, true);
+
+  // Test duplicate patterns with different IDs
+  // String    abcde
+  // Pattern 1  bc
+  // Pattern 2  bc
+  TestTwoPatterns("abcde", "bc", "bc", true, true);
+
+  // Test non-match
+  // String    abcde
+  // Pattern 1        fg
+  TestOnePattern("abcde", "fg", false);
+
+  // Test empty pattern and too long pattern
+  // String    abcde
+  // Pattern 1
+  // Pattern 2 abcdef
+  TestTwoPatterns("abcde", "", "abcdef", true, false);
+}
+
+TEST(SubstringSetMatcherTest, Clear) {
+  // Setup one pattern.
+  std::vector<SubstringPattern> patterns;
+  patterns.push_back(SubstringPattern("a", 1));
+  SubstringSetMatcher matcher;
+  matcher.RegisterPatterns(patterns);
+
+  // Verify state.
+  std::set<int> matches;
+  matcher.Match("abc", &matches);
+  EXPECT_EQ(1u, matches.size());
+  EXPECT_NE(matches.end(), matches.find(1));
+
+  matches.clear();
+
+  // Check that clearing the pattern works.
+  matcher.Clear();
+  matcher.Match("abc", &matches);
+  EXPECT_EQ(0u, matches.size());
+  EXPECT_EQ(matches.end(), matches.find(1));
+}
+
+TEST(SubstringSetMatcherTest, RegisterAndRemove) {
+  SubstringSetMatcher matcher;
+
+  std::vector<SubstringPattern> patterns;
+  patterns.push_back(SubstringPattern("a", 1));
+  matcher.RegisterPatterns(patterns);
+
+  patterns.clear();
+  patterns.push_back(SubstringPattern("b", 2));
+  patterns.push_back(SubstringPattern("c", 3));
+  matcher.RegisterPatterns(patterns);
+
+  std::set<int> matches;
+  matcher.Match("abd", &matches);
+  EXPECT_EQ(2u, matches.size());
+  EXPECT_NE(matches.end(), matches.find(1));
+  EXPECT_NE(matches.end(), matches.find(2));
+
+  patterns.clear();
+  patterns.push_back(SubstringPattern("b", 2));
+  matcher.UnregisterPatterns(patterns);
+
+  matches.clear();
+  matcher.Match("abd", &matches);
+  EXPECT_EQ(1u, matches.size());
+  EXPECT_NE(matches.end(), matches.find(1));
+  EXPECT_EQ(matches.end(), matches.find(2));
+}