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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Hunks.h"
#include <AK/Debug.h>
namespace Diff {
Vector<Hunk> parse_hunks(String const& diff)
{
Vector<String> diff_lines = diff.split('\n');
if (diff_lines.is_empty())
return {};
Vector<Hunk> hunks;
size_t line_index = 0;
HunkLocation current_location {};
// Skip to first hunk
while (diff_lines[line_index][0] != '@') {
++line_index;
}
while (line_index < diff_lines.size()) {
if (diff_lines[line_index][0] == '@') {
current_location = parse_hunk_location(diff_lines[line_index]);
++line_index;
continue;
}
if (diff_lines[line_index][0] == ' ') {
current_location.apply_offset(1, HunkLocation::LocationType::Both);
++line_index;
continue;
}
Hunk hunk {};
hunk.original_start_line = current_location.original_start_line;
hunk.target_start_line = current_location.target_start_line;
while (line_index < diff_lines.size() && diff_lines[line_index][0] == '-') {
hunk.removed_lines.append(diff_lines[line_index].substring(1, diff_lines[line_index].length() - 1));
current_location.apply_offset(1, HunkLocation::LocationType::Original);
++line_index;
}
while (line_index < diff_lines.size() && diff_lines[line_index][0] == '+') {
hunk.added_lines.append(diff_lines[line_index].substring(1, diff_lines[line_index].length() - 1));
current_location.apply_offset(1, HunkLocation::LocationType::Target);
++line_index;
}
while (line_index < diff_lines.size() && diff_lines[line_index][0] == ' ') {
current_location.apply_offset(1, HunkLocation::LocationType::Both);
++line_index;
}
hunks.append(hunk);
}
if constexpr (HUNKS_DEBUG) {
for (auto const& hunk : hunks) {
dbgln("Hunk location:");
dbgln(" orig: {}", hunk.original_start_line);
dbgln(" target: {}", hunk.target_start_line);
dbgln(" removed:");
for (auto const& line : hunk.removed_lines)
dbgln("- {}", line);
dbgln(" added:");
for (auto const& line : hunk.added_lines)
dbgln("+ {}", line);
}
}
return hunks;
}
HunkLocation parse_hunk_location(String const& location_line)
{
size_t char_index = 0;
struct StartAndLength {
size_t start { 0 };
size_t length { 0 };
};
auto parse_start_and_length_pair = [](String const& raw) {
auto index_of_separator = raw.find(',').value();
auto start = raw.substring(0, index_of_separator).to_uint().value();
auto length = raw.substring(index_of_separator + 1, raw.length() - index_of_separator - 1).to_uint().value();
if (start != 0)
start--;
if (length != 0)
length--;
return StartAndLength { start, length };
};
while (char_index < location_line.length() && location_line[char_index++] != '-') {
}
VERIFY(char_index < location_line.length());
size_t original_location_start_index = char_index;
while (char_index < location_line.length() && location_line[char_index++] != ' ') {
}
VERIFY(char_index < location_line.length() && location_line[char_index] == '+');
size_t original_location_end_index = char_index - 2;
size_t target_location_start_index = char_index + 1;
char_index += 1;
while (char_index < location_line.length() && location_line[char_index++] != ' ') {
}
VERIFY(char_index < location_line.length());
size_t target_location_end_index = char_index - 2;
auto original_pair = parse_start_and_length_pair(location_line.substring(original_location_start_index, original_location_end_index - original_location_start_index + 1));
auto target_pair = parse_start_and_length_pair(location_line.substring(target_location_start_index, target_location_end_index - target_location_start_index + 1));
return { original_pair.start, original_pair.length, target_pair.start, target_pair.length };
}
void HunkLocation::apply_offset(size_t offset, HunkLocation::LocationType type)
{
if (type == LocationType::Original || type == LocationType::Both) {
original_start_line += offset;
original_length -= offset;
}
if (type == LocationType::Target || type == LocationType::Both) {
target_start_line += offset;
target_length -= offset;
}
}
};
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