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/*
* 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
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