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Move file_wrapper and make testable. (#1085)

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* WIP Move file_wrapper and make testable.

* More tests, get text_editor compiling

* Back to working

* Run formatter

---------

Co-authored-by: kallanreed <kallanreed@outlook.com>
This commit is contained in:
Kyle Reed 2023-05-28 08:44:21 -07:00 • committed by GitHub
parent 23c24355ab
commit e50d8dc148
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7 changed files with 731 additions and 308 deletions
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73
firmware/application/apps/ui_text_editor.hpp
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@ -28,90 +28,19 @@
#include "ui_painter.hpp"
#include "ui_widget.hpp"
#include "circular_buffer.hpp"
#include "file.hpp"
#include "file_wrapper.hpp"
#include "optional.hpp"
#include <memory>
#include <string>
#include <vector>
namespace ui {
/* TODO:
* - Copy on write into temp file so startup is fast.
*/
enum class LineEnding : uint8_t {
LF,
CRLF
};
enum class ScrollDirection : uint8_t {
Vertical,
Horizontal
};
/* Wraps a file and provides an API for accessing lines efficiently. */
class FileWrapper {
public:
using Error = std::filesystem::filesystem_error;
using Offset = uint32_t; // TODO: make enums?
using Line = uint32_t;
using Column = uint32_t;
using Range = struct {
// Offset of the line start.
Offset start;
// Offset of one past the line end.
Offset end;
};
FileWrapper();
/* Prevent copies. */
FileWrapper(const FileWrapper&) = delete;
FileWrapper& operator=(const FileWrapper&) = delete;
Optional<Error> open(const std::filesystem::path& path);
std::string get_text(Line line, Column col, Offset length);
File::Size size() const { return file_.size(); }
uint32_t line_count() const { return line_count_; }
Optional<Range> line_range(Line line);
Offset line_length(Line line);
private:
/* Number of newline offsets to cache. */
static constexpr Offset max_newlines = 64;
static constexpr size_t buffer_size = 512;
void initialize();
std::string read(Offset offset, Offset length = 30);
/* Returns the offset into the newline cache if valid. */
Optional<Offset> offset_for_line(Line line) const;
/* Ensure specified line is in the newline cache. */
void ensure_cached(Line line);
/* Helpers for finding the prev/next newline. */
Optional<Offset> previous_newline(Offset start);
Optional<Offset> next_newline(Offset start);
File file_{};
/* Total number of lines in the file. */
Offset line_count_{0};
/* The offset and line of the newlines cache. */
Offset start_offset_{0};
Offset start_line_{0};
LineEnding line_ending_{LineEnding::LF};
CircularBuffer<Offset, max_newlines + 1> newlines_{};
};
/* Control that renders a text file. */
class TextViewer : public Widget {
public: