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LibDiff: Implement ability to parse a patch header

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This is a somewhat naive implementation, but it is enough to parse a
simple unified patch header.

After parsing the patch header, the parser will be at the beginning of
the first hunks range, ready for that hunk to be parsed.
This commit is contained in:
Shannon Booth 2023-07-06 20:52:26 +12:00 committed by Sam Atkins
parent ef45221c21
commit efb26b1781
Notes: sideshowbarker 2024-07-17 01:23:08 +09:00 
Author: https://github.com/shannonbooth
Commit: https://github.com/SerenityOS/serenity/commit/efb26b1781
Pull-request: https://github.com/SerenityOS/serenity/pull/19844
Reviewed-by: https://github.com/AtkinsSJ ✅
3 changed files with 44 additions and 0 deletions
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3
Userland/Libraries/LibDiff/Forward.h
View file

@ -8,8 +8,11 @@
namespace Diff {
enum class Format;
class Parser;
struct Header;
struct Hunk;
struct HunkLocation;
struct Line;

27
Userland/Libraries/LibDiff/Hunks.cpp
View file

@ -57,6 +57,33 @@ bool Parser::consume_line_number(size_t& number)
return true;
}
ErrorOr<Header> Parser::parse_header()
{
Header header;
while (!is_eof()) {
if (consume_specific("+++ ")) {
header.new_file_path = TRY(String::from_utf8(consume_line()));
continue;
}
if (consume_specific("--- ")) {
header.old_file_path = TRY(String::from_utf8(consume_line()));
continue;
}
if (next_is("@@ ")) {
header.format = Format::Unified;
return header;
}
consume_line();
}
return Error::from_string_literal("Unable to find any patch");
}
ErrorOr<Vector<Hunk>> Parser::parse_hunks()
{
Vector<Hunk> hunks;

14
Userland/Libraries/LibDiff/Hunks.h
View file

@ -59,12 +59,26 @@ struct Hunk {
Vector<Line> lines;
};
enum class Format {
Unified,
Unknown,
};
struct Header {
Format format { Format::Unknown };
String old_file_path;
String new_file_path;
};
class Parser : public GenericLexer {
public:
using GenericLexer::GenericLexer;
ErrorOr<Vector<Hunk>> parse_hunks();
ErrorOr<Header> parse_header();
private:
Optional<HunkLocation> consume_unified_location();
bool consume_line_number(size_t& number);