upload android base code part6

android/system/tools/aidl/tests/test_util.cpp

@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2015, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <algorithm>
+#include <iostream>
+#include <iterator>
+
+#include <android-base/strings.h>
+
+#include "os.h"
+#include "tests/test_util.h"
+
+using android::base::Split;
+using android::base::Join;
+using std::string;
+using std::vector;
+using std::cout;
+using std::endl;
+using std::distance;
+
+namespace android {
+namespace aidl {
+namespace test {
+
+string CanonicalNameToPath(const char* package_class, const char* extension) {
+  string rel_path{package_class};
+  for (char& c : rel_path) {
+    if (c == '.') {
+      c = OS_PATH_SEPARATOR;
+    }
+  }
+  rel_path += extension;
+  return rel_path;
+}
+
+void SplitPackageClass(const string& package_class,
+                       string* rel_path,
+                       string* package,
+                       string* class_name) {
+  *package = string{package_class, 0, package_class.rfind('.')};
+  *class_name = string{package_class, package_class.rfind('.') + 1};
+  *rel_path = CanonicalNameToPath(package_class.c_str(), ".aidl");
+}
+
+void PrintDiff(const string& a, const string& b) {
+  const int LEFT = 1;
+  const int UP = 2;
+  const int UP_LEFT = 4;
+
+  auto a_lines = Split(a, "\n");
+  auto b_lines = Split(b, "\n");
+
+  struct diff_table_entry {
+    size_t longest_common_subsequence_length;
+    int propagation_directions;
+  };
+
+  diff_table_entry table[a_lines.size() + 1][b_lines.size() + 1];
+
+  for (size_t i = 0; i < a_lines.size() + 1; ++i) {
+    for (size_t j = 0; j < b_lines.size() + 1; ++j) {
+      if (i == 0 || j == 0) {
+        int directions = 0;
+
+        if (i) {
+          directions |= UP;
+        }
+
+        if (j) {
+          directions |= LEFT;
+        }
+
+        table[i][j].longest_common_subsequence_length = 0;
+        table[i][j].propagation_directions = directions;
+      } else if (a_lines[i-1] == b_lines[j-1]) {
+        table[i][j].longest_common_subsequence_length =
+            table[i-1][j-1].longest_common_subsequence_length + 1;
+        table[i][j].propagation_directions = UP_LEFT;
+      } else {
+        size_t length_up = table[i-1][j].longest_common_subsequence_length;
+        size_t length_left = table[i][j-1].longest_common_subsequence_length;
+        int directions = 0;
+        size_t length;
+
+        if (length_up >= length_left) {
+          directions |= UP;
+          length = length_up;
+        }
+
+        if (length_left >= length_up) {
+          directions |= LEFT;
+          length = length_left;
+        }
+
+        table[i][j].longest_common_subsequence_length = length;
+        table[i][j].propagation_directions = directions;
+      }
+    }
+  }
+
+  size_t i = a_lines.size();
+  size_t j = b_lines.size();
+  vector<string> output;
+
+  while (table[i][j].propagation_directions) {
+    if (table[i][j].propagation_directions & UP_LEFT) {
+      output.push_back(" " + a_lines[i-1]);
+      i--;
+      j--;
+    } else if (table[i][j].propagation_directions & UP) {
+      output.push_back("-" + a_lines[i-1]);
+      i--;
+    } else {
+      output.push_back("+" + b_lines[j-1]);
+      j--;
+    }
+  }
+
+  int print_mask = 0;
+  bool printed_last = false;
+  size_t line_number = 0;
+
+  for (auto it = output.crbegin(), frontier = output.crbegin();
+       it != output.crend(); ++it) {
+    while (frontier != output.crend() && distance(it, frontier) <= 3) {
+      print_mask <<= 1;
+      print_mask &= 0x7f;
+
+      if ((*frontier)[0] != ' ') {
+        print_mask |= 1;
+      }
+
+      frontier++;
+    }
+
+    if ((*it)[0] != '-') {
+      line_number++;
+    }
+
+    if (print_mask) {
+      if (!printed_last) {
+        cout << "Line: " << line_number << endl;
+      }
+
+      cout << *it << endl;
+      printed_last = true;
+    } else {
+      printed_last = false;
+    }
+  }
+}
+
+}  // namespace test
+}  // namespace android
+}  // namespace aidl