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efb26b1781
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.
124 lines
2.9 KiB
C++
124 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* Copyright (c) 2023, Shannon Booth <shannon.ml.booth@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Format.h>
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#include <AK/GenericLexer.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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namespace Diff {
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struct Range {
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size_t start_line { 0 };
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size_t number_of_lines { 0 };
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};
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struct HunkLocation {
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Range old_range;
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Range new_range;
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};
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struct Line {
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enum class Operation {
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Addition = '+',
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Removal = '-',
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Context = ' ',
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// NOTE: This should only be used when deconstructing a hunk into old and new lines (context format)
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Change = '!',
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};
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static constexpr Operation operation_from_symbol(char symbol)
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{
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switch (symbol) {
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case '+':
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return Operation::Addition;
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case '-':
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return Operation::Removal;
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case ' ':
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return Operation::Context;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Operation operation;
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String content;
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};
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struct Hunk {
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HunkLocation location;
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Vector<Line> lines;
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};
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enum class Format {
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Unified,
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Unknown,
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};
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struct Header {
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Format format { Format::Unknown };
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String old_file_path;
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String new_file_path;
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};
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class Parser : public GenericLexer {
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public:
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using GenericLexer::GenericLexer;
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ErrorOr<Vector<Hunk>> parse_hunks();
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ErrorOr<Header> parse_header();
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private:
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Optional<HunkLocation> consume_unified_location();
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bool consume_line_number(size_t& number);
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};
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ErrorOr<Vector<Hunk>> parse_hunks(StringView diff);
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}
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template<>
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struct AK::Formatter<Diff::Line::Operation> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, Diff::Line::Operation operation)
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{
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return Formatter<FormatString>::format(builder, "{}"sv, static_cast<char>(operation));
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}
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};
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template<>
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struct AK::Formatter<Diff::Line> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, Diff::Line const& line)
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{
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return Formatter<FormatString>::format(builder, "{}{}"sv, line.operation, line.content);
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}
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};
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template<>
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struct AK::Formatter<Diff::HunkLocation> : Formatter<FormatString> {
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static ErrorOr<void> format(FormatBuilder& format_builder, Diff::HunkLocation const& location)
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{
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auto& builder = format_builder.builder();
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TRY(builder.try_appendff("@@ -{}"sv, location.old_range.start_line));
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if (location.old_range.number_of_lines != 1)
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TRY(builder.try_appendff(",{}", location.old_range.number_of_lines));
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TRY(builder.try_appendff(" +{}", location.new_range.start_line));
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if (location.new_range.number_of_lines != 1)
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TRY(builder.try_appendff(",{}", location.new_range.number_of_lines));
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return builder.try_appendff(" @@");
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}
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};
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