Kyle Isom
0d87bc0b25
- Added `ErrorRecovery.cc` and `ErrorRecovery.h` for retry and circuit breaker implementations. - Enhanced swap file handling with transient error retries and exponential backoff (e.g., ENOSPC, EDQUOT). - Integrated circuit breaker into SwapManager to gracefully handle repeated failures, prevent system overload, and enable automatic recovery. - Updated `DEVELOPER_GUIDE.md` with comprehensive documentation on error recovery patterns and graceful degradation strategies. - Refined fsync, temp file creation, and swap file logic with retry-on-failure mechanisms for improved resilience.
817 lines
22 KiB
C++
817 lines
22 KiB
C++
#include <fstream>
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#include <sstream>
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#include <filesystem>
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#include <cstdlib>
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#include <limits>
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#include <cerrno>
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#include <cstring>
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#include <string_view>
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#include <vector>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "Buffer.h"
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#include "SwapRecorder.h"
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#include "UndoSystem.h"
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#include "UndoTree.h"
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#include "ErrorHandler.h"
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#include "SyscallWrappers.h"
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#include "ErrorRecovery.h"
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// For reconstructing highlighter state on copies
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#include "syntax/HighlighterRegistry.h"
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#include "syntax/NullHighlighter.h"
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Buffer::Buffer()
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{
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// Initialize undo system per buffer
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undo_tree_ = std::make_unique<UndoTree>();
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undo_sys_ = std::make_unique<UndoSystem>(*this, *undo_tree_);
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}
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bool
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Buffer::stat_identity(const std::string &path, FileIdentity &out)
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{
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struct stat st{};
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if (::stat(path.c_str(), &st) != 0) {
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out.valid = false;
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return false;
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}
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out.valid = true;
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// Use nanosecond timestamp when available.
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std::uint64_t ns = 0;
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#if defined(__APPLE__)
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ns = static_cast<std::uint64_t>(st.st_mtimespec.tv_sec) * 1000000000ull
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+ static_cast<std::uint64_t>(st.st_mtimespec.tv_nsec);
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#else
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ns = static_cast<std::uint64_t>(st.st_mtim.tv_sec) * 1000000000ull
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+ static_cast<std::uint64_t>(st.st_mtim.tv_nsec);
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#endif
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out.mtime_ns = ns;
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out.size = static_cast<std::uint64_t>(st.st_size);
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out.dev = static_cast<std::uint64_t>(st.st_dev);
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out.ino = static_cast<std::uint64_t>(st.st_ino);
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return true;
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}
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bool
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Buffer::current_disk_identity(FileIdentity &out) const
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{
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if (!is_file_backed_ || filename_.empty()) {
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out.valid = false;
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return false;
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}
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return stat_identity(filename_, out);
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}
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bool
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Buffer::ExternallyModifiedOnDisk() const
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{
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if (!is_file_backed_ || filename_.empty())
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return false;
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FileIdentity now{};
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if (!current_disk_identity(now)) {
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// If the file vanished, treat as modified when we previously had an identity.
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return on_disk_identity_.valid;
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}
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if (!on_disk_identity_.valid)
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return false;
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return now.mtime_ns != on_disk_identity_.mtime_ns
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|| now.size != on_disk_identity_.size
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|| now.dev != on_disk_identity_.dev
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|| now.ino != on_disk_identity_.ino;
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}
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void
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Buffer::RefreshOnDiskIdentity()
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{
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FileIdentity id{};
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if (current_disk_identity(id))
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on_disk_identity_ = id;
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}
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static bool
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write_all_fd(int fd, const char *data, std::size_t len, std::string &err)
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{
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std::size_t off = 0;
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while (off < len) {
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ssize_t n = ::write(fd, data + off, len - off);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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err = std::string("Write failed: ") + std::strerror(errno);
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return false;
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}
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off += static_cast<std::size_t>(n);
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}
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return true;
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}
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static void
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best_effort_fsync_dir(const std::string &path)
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{
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try {
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std::filesystem::path p(path);
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std::filesystem::path dir = p.parent_path();
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if (dir.empty())
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return;
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int dfd = kte::syscall::Open(dir.c_str(), O_RDONLY);
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if (dfd < 0)
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return;
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(void) kte::syscall::Fsync(dfd);
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(void) kte::syscall::Close(dfd);
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} catch (...) {
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// best-effort
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}
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}
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static bool
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atomic_write_file(const std::string &path, const char *data, std::size_t len, std::string &err)
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{
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// Create a temp file in the same directory so rename() is atomic.
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std::filesystem::path p(path);
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std::filesystem::path dir = p.parent_path();
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std::string base = p.filename().string();
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std::filesystem::path tmpl = dir / ("." + base + ".kte.tmp.XXXXXX");
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std::string tmpl_s = tmpl.string();
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// mkstemp requires a mutable buffer.
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std::vector<char> buf(tmpl_s.begin(), tmpl_s.end());
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buf.push_back('\0');
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// Retry on transient errors for temp file creation
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int fd = -1;
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auto mkstemp_fn = [&]() -> bool {
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// Reset buffer for each retry attempt
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buf.assign(tmpl_s.begin(), tmpl_s.end());
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buf.push_back('\0');
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fd = kte::syscall::Mkstemp(buf.data());
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return fd >= 0;
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};
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if (!kte::RetryOnTransientError(mkstemp_fn, kte::RetryPolicy::Aggressive(), err)) {
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if (fd < 0) {
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err = std::string("Failed to create temp file for save: ") + std::strerror(errno) + err;
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}
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return false;
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}
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std::string tmp_path(buf.data());
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// If the destination exists, carry over its permissions.
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struct stat dst_st{};
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if (::stat(path.c_str(), &dst_st) == 0) {
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(void) kte::syscall::Fchmod(fd, dst_st.st_mode);
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}
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bool ok = write_all_fd(fd, data, len, err);
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if (ok) {
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// Retry fsync on transient errors
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auto fsync_fn = [&]() -> bool {
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return kte::syscall::Fsync(fd) == 0;
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};
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std::string fsync_err;
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if (!kte::RetryOnTransientError(fsync_fn, kte::RetryPolicy::Aggressive(), fsync_err)) {
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err = std::string("fsync failed: ") + std::strerror(errno) + fsync_err;
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ok = false;
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}
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}
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(void) kte::syscall::Close(fd);
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if (ok) {
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if (::rename(tmp_path.c_str(), path.c_str()) != 0) {
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err = std::string("rename failed: ") + std::strerror(errno);
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ok = false;
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}
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}
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if (!ok) {
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(void) ::unlink(tmp_path.c_str());
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return false;
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}
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best_effort_fsync_dir(path);
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return true;
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}
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Buffer::Buffer(const std::string &path)
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{
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std::string err;
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OpenFromFile(path, err);
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}
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// Copy constructor/assignment: perform a deep copy of core fields; reinitialize undo for the new buffer.
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Buffer::Buffer(const Buffer &other)
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{
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curx_ = other.curx_;
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cury_ = other.cury_;
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rx_ = other.rx_;
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nrows_ = other.nrows_;
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rowoffs_ = other.rowoffs_;
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coloffs_ = other.coloffs_;
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rows_ = other.rows_;
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content_ = other.content_;
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rows_cache_dirty_ = other.rows_cache_dirty_;
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filename_ = other.filename_;
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is_file_backed_ = other.is_file_backed_;
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dirty_ = other.dirty_;
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read_only_ = other.read_only_;
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mark_set_ = other.mark_set_;
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mark_curx_ = other.mark_curx_;
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mark_cury_ = other.mark_cury_;
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// Copy syntax/highlighting flags
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version_ = other.version_;
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syntax_enabled_ = other.syntax_enabled_;
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filetype_ = other.filetype_;
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// Fresh undo system for the copy
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undo_tree_ = std::make_unique<UndoTree>();
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undo_sys_ = std::make_unique<UndoSystem>(*this, *undo_tree_);
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// Recreate a highlighter engine for this copy based on filetype/syntax state
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if (syntax_enabled_) {
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// Allocate engine and install an appropriate highlighter
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highlighter_ = std::make_unique<kte::HighlighterEngine>();
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if (!filetype_.empty()) {
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auto hl = kte::HighlighterRegistry::CreateFor(filetype_);
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if (hl) {
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highlighter_->SetHighlighter(std::move(hl));
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} else {
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// Unsupported filetype -> NullHighlighter keeps syntax pipeline active
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highlighter_->SetHighlighter(std::make_unique<kte::NullHighlighter>());
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}
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} else {
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// No filetype -> keep syntax enabled but use NullHighlighter
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highlighter_->SetHighlighter(std::make_unique<kte::NullHighlighter>());
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}
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// Fresh engine has empty caches; nothing to invalidate
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}
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}
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Buffer &
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Buffer::operator=(const Buffer &other)
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{
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if (this == &other)
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return *this;
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curx_ = other.curx_;
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cury_ = other.cury_;
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rx_ = other.rx_;
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nrows_ = other.nrows_;
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rowoffs_ = other.rowoffs_;
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coloffs_ = other.coloffs_;
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rows_ = other.rows_;
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content_ = other.content_;
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rows_cache_dirty_ = other.rows_cache_dirty_;
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filename_ = other.filename_;
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is_file_backed_ = other.is_file_backed_;
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dirty_ = other.dirty_;
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read_only_ = other.read_only_;
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mark_set_ = other.mark_set_;
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mark_curx_ = other.mark_curx_;
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mark_cury_ = other.mark_cury_;
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version_ = other.version_;
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syntax_enabled_ = other.syntax_enabled_;
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filetype_ = other.filetype_;
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// Recreate undo system for this instance
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undo_tree_ = std::make_unique<UndoTree>();
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undo_sys_ = std::make_unique<UndoSystem>(*this, *undo_tree_);
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// Recreate highlighter engine consistent with syntax settings
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highlighter_.reset();
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if (syntax_enabled_) {
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highlighter_ = std::make_unique<kte::HighlighterEngine>();
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if (!filetype_.empty()) {
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auto hl = kte::HighlighterRegistry::CreateFor(filetype_);
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if (hl) {
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highlighter_->SetHighlighter(std::move(hl));
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} else {
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highlighter_->SetHighlighter(std::make_unique<kte::NullHighlighter>());
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}
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} else {
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highlighter_->SetHighlighter(std::make_unique<kte::NullHighlighter>());
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}
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}
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return *this;
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}
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// Move constructor: move all fields and update UndoSystem's buffer reference
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Buffer::Buffer(Buffer &&other) noexcept
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: curx_(other.curx_),
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cury_(other.cury_),
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rx_(other.rx_),
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nrows_(other.nrows_),
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rowoffs_(other.rowoffs_),
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coloffs_(other.coloffs_),
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rows_(std::move(other.rows_)),
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filename_(std::move(other.filename_)),
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is_file_backed_(other.is_file_backed_),
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dirty_(other.dirty_),
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read_only_(other.read_only_),
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mark_set_(other.mark_set_),
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mark_curx_(other.mark_curx_),
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mark_cury_(other.mark_cury_),
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undo_tree_(std::move(other.undo_tree_)),
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undo_sys_(std::move(other.undo_sys_))
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{
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// Move syntax/highlighting state
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version_ = other.version_;
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syntax_enabled_ = other.syntax_enabled_;
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filetype_ = std::move(other.filetype_);
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highlighter_ = std::move(other.highlighter_);
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content_ = std::move(other.content_);
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rows_cache_dirty_ = other.rows_cache_dirty_;
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// Update UndoSystem's buffer reference to point to this object
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if (undo_sys_) {
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undo_sys_->UpdateBufferReference(*this);
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}
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}
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// Move assignment: move all fields and update UndoSystem's buffer reference
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Buffer &
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Buffer::operator=(Buffer &&other) noexcept
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{
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if (this == &other)
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return *this;
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curx_ = other.curx_;
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cury_ = other.cury_;
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rx_ = other.rx_;
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nrows_ = other.nrows_;
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rowoffs_ = other.rowoffs_;
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coloffs_ = other.coloffs_;
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rows_ = std::move(other.rows_);
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filename_ = std::move(other.filename_);
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is_file_backed_ = other.is_file_backed_;
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dirty_ = other.dirty_;
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read_only_ = other.read_only_;
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mark_set_ = other.mark_set_;
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mark_curx_ = other.mark_curx_;
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mark_cury_ = other.mark_cury_;
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undo_tree_ = std::move(other.undo_tree_);
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undo_sys_ = std::move(other.undo_sys_);
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// Move syntax/highlighting state
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version_ = other.version_;
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syntax_enabled_ = other.syntax_enabled_;
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filetype_ = std::move(other.filetype_);
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highlighter_ = std::move(other.highlighter_);
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content_ = std::move(other.content_);
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rows_cache_dirty_ = other.rows_cache_dirty_;
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// Update UndoSystem's buffer reference to point to this object
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if (undo_sys_) {
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undo_sys_->UpdateBufferReference(*this);
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}
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return *this;
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}
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bool
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Buffer::OpenFromFile(const std::string &path, std::string &err)
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{
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auto normalize_path = [](const std::string &in) -> std::string {
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std::string expanded = in;
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// Expand leading '~' to HOME
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if (!expanded.empty() && expanded[0] == '~') {
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const char *home = std::getenv("HOME");
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if (home && expanded.size() >= 2 && (expanded[1] == '/' || expanded[1] == '\\')) {
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expanded = std::string(home) + expanded.substr(1);
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} else if (home && expanded.size() == 1) {
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expanded = std::string(home);
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}
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}
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try {
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std::filesystem::path p(expanded);
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if (std::filesystem::exists(p)) {
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return std::filesystem::canonical(p).string();
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}
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return std::filesystem::absolute(p).string();
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} catch (...) {
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// On any error, fall back to input
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return expanded;
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}
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};
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const std::string norm = normalize_path(path);
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// If the file doesn't exist, initialize an empty, non-file-backed buffer
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// with the provided filename. Do not touch the filesystem until Save/SaveAs.
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if (!std::filesystem::exists(norm)) {
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rows_.clear();
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nrows_ = 0;
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filename_ = norm;
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is_file_backed_ = false;
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dirty_ = false;
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// Reset cursor/viewport state
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curx_ = cury_ = rx_ = 0;
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rowoffs_ = coloffs_ = 0;
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mark_set_ = false;
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mark_curx_ = mark_cury_ = 0;
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// Empty PieceTable
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content_.Clear();
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rows_cache_dirty_ = true;
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return true;
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}
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std::ifstream in(norm, std::ios::in | std::ios::binary);
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if (!in) {
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err = "Failed to open file: " + norm;
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kte::ErrorHandler::Instance().Error("Buffer", err, norm);
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return false;
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}
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// Read entire file into PieceTable as-is
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std::string data;
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in.seekg(0, std::ios::end);
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if (!in) {
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err = "Failed to seek to end of file: " + norm;
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kte::ErrorHandler::Instance().Error("Buffer", err, norm);
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return false;
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}
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auto sz = in.tellg();
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if (sz < 0) {
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err = "Failed to get file size: " + norm;
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kte::ErrorHandler::Instance().Error("Buffer", err, norm);
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return false;
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}
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if (sz > 0) {
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data.resize(static_cast<std::size_t>(sz));
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in.seekg(0, std::ios::beg);
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if (!in) {
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err = "Failed to seek to beginning of file: " + norm;
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kte::ErrorHandler::Instance().Error("Buffer", err, norm);
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return false;
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}
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in.read(data.data(), static_cast<std::streamsize>(data.size()));
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if (!in && !in.eof()) {
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err = "Failed to read file: " + norm;
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kte::ErrorHandler::Instance().Error("Buffer", err, norm);
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return false;
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}
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// Validate we read the expected number of bytes
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const std::streamsize bytes_read = in.gcount();
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if (bytes_read != static_cast<std::streamsize>(data.size())) {
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err = "Partial read of file (expected " + std::to_string(data.size()) +
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" bytes, got " + std::to_string(bytes_read) + "): " + norm;
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kte::ErrorHandler::Instance().Error("Buffer", err, norm);
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return false;
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}
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}
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content_.Clear();
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if (!data.empty())
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content_.Append(data.data(), data.size());
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rows_cache_dirty_ = true;
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nrows_ = 0; // not used under PieceTable
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filename_ = norm;
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is_file_backed_ = true;
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dirty_ = false;
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RefreshOnDiskIdentity();
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// Reset/initialize undo system for this loaded file
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if (!undo_tree_)
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undo_tree_ = std::make_unique<UndoTree>();
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if (!undo_sys_)
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undo_sys_ = std::make_unique<UndoSystem>(*this, *undo_tree_);
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// Clear any existing history for a fresh load
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undo_sys_->clear();
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// Reset cursor/viewport state
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curx_ = cury_ = rx_ = 0;
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rowoffs_ = coloffs_ = 0;
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mark_set_ = false;
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mark_curx_ = mark_cury_ = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool
|
|
Buffer::Save(std::string &err) const
|
|
{
|
|
if (!is_file_backed_ || filename_.empty()) {
|
|
err = "Buffer is not file-backed; use SaveAs()";
|
|
return false;
|
|
}
|
|
const std::size_t sz = content_.Size();
|
|
const char *data = sz ? content_.Data() : nullptr;
|
|
if (sz && !data) {
|
|
err = "Internal error: buffer materialization failed";
|
|
return false;
|
|
}
|
|
if (!atomic_write_file(filename_, data ? data : "", sz, err)) {
|
|
kte::ErrorHandler::Instance().Error("Buffer", err, filename_);
|
|
return false;
|
|
}
|
|
// Update observed on-disk identity after a successful save.
|
|
const_cast<Buffer *>(this)->RefreshOnDiskIdentity();
|
|
// Note: const method cannot change dirty_. Intentionally const to allow UI code
|
|
// to decide when to flip dirty flag after successful save.
|
|
return true;
|
|
}
|
|
|
|
|
|
bool
|
|
Buffer::SaveAs(const std::string &path, std::string &err)
|
|
{
|
|
// Normalize output path first
|
|
std::string out_path;
|
|
try {
|
|
std::filesystem::path p(path);
|
|
// Do a light expansion of '~'
|
|
std::string expanded = path;
|
|
if (!expanded.empty() && expanded[0] == '~') {
|
|
const char *home = std::getenv("HOME");
|
|
if (home && expanded.size() >= 2 && (expanded[1] == '/' || expanded[1] == '\\'))
|
|
expanded = std::string(home) + expanded.substr(1);
|
|
else if (home && expanded.size() == 1)
|
|
expanded = std::string(home);
|
|
}
|
|
std::filesystem::path ep(expanded);
|
|
out_path = std::filesystem::absolute(ep).string();
|
|
} catch (...) {
|
|
out_path = path;
|
|
}
|
|
|
|
const std::size_t sz = content_.Size();
|
|
const char *data = sz ? content_.Data() : nullptr;
|
|
if (sz && !data) {
|
|
err = "Internal error: buffer materialization failed";
|
|
return false;
|
|
}
|
|
if (!atomic_write_file(out_path, data ? data : "", sz, err)) {
|
|
kte::ErrorHandler::Instance().Error("Buffer", err, out_path);
|
|
return false;
|
|
}
|
|
|
|
filename_ = out_path;
|
|
is_file_backed_ = true;
|
|
dirty_ = false;
|
|
RefreshOnDiskIdentity();
|
|
return true;
|
|
}
|
|
|
|
|
|
std::string
|
|
Buffer::AsString() const
|
|
{
|
|
std::stringstream ss;
|
|
ss << "Buffer<" << this->filename_;
|
|
if (this->Dirty()) {
|
|
ss << "*";
|
|
}
|
|
ss << ">: " << content_.LineCount() << " lines";
|
|
return ss.str();
|
|
}
|
|
|
|
|
|
// --- Raw editing APIs (no undo recording, cursor untouched) ---
|
|
void
|
|
Buffer::insert_text(int row, int col, std::string_view text)
|
|
{
|
|
if (row < 0)
|
|
row = 0;
|
|
if (col < 0)
|
|
col = 0;
|
|
const std::size_t off = content_.LineColToByteOffset(static_cast<std::size_t>(row),
|
|
static_cast<std::size_t>(col));
|
|
if (!text.empty()) {
|
|
content_.Insert(off, text.data(), text.size());
|
|
rows_cache_dirty_ = true;
|
|
if (swap_rec_)
|
|
swap_rec_->OnInsert(row, col, text);
|
|
}
|
|
}
|
|
|
|
|
|
// ===== Adapter helpers for PieceTable-backed Buffer =====
|
|
std::string_view
|
|
Buffer::GetLineView(std::size_t row) const
|
|
{
|
|
// Get byte range for the logical line and return a view into materialized data
|
|
auto range = content_.GetLineRange(row); // [start,end) in bytes
|
|
const char *base = content_.Data(); // materializes if needed
|
|
if (!base)
|
|
return std::string_view();
|
|
const std::size_t start = range.first;
|
|
const std::size_t len = (range.second > range.first) ? (range.second - range.first) : 0;
|
|
return std::string_view(base + start, len);
|
|
}
|
|
|
|
|
|
void
|
|
Buffer::ensure_rows_cache() const
|
|
{
|
|
std::lock_guard<std::mutex> lock(buffer_mutex_);
|
|
if (!rows_cache_dirty_)
|
|
return;
|
|
rows_.clear();
|
|
const std::size_t lc = content_.LineCount();
|
|
rows_.reserve(lc);
|
|
for (std::size_t i = 0; i < lc; ++i) {
|
|
rows_.emplace_back(content_.GetLine(i));
|
|
}
|
|
// Keep nrows_ in sync for any legacy code that still reads it
|
|
const_cast<Buffer *>(this)->nrows_ = rows_.size();
|
|
rows_cache_dirty_ = false;
|
|
}
|
|
|
|
|
|
std::size_t
|
|
Buffer::content_LineCount_() const
|
|
{
|
|
return content_.LineCount();
|
|
}
|
|
|
|
|
|
#if defined(KTE_TESTS)
|
|
std::string
|
|
Buffer::BytesForTests() const
|
|
{
|
|
const std::size_t sz = content_.Size();
|
|
if (sz == 0)
|
|
return std::string();
|
|
const char *data = content_.Data();
|
|
if (!data)
|
|
return std::string();
|
|
return std::string(data, data + sz);
|
|
}
|
|
#endif
|
|
|
|
|
|
void
|
|
Buffer::delete_text(int row, int col, std::size_t len)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
if (row < 0)
|
|
row = 0;
|
|
if (col < 0)
|
|
col = 0;
|
|
|
|
const std::size_t start = content_.LineColToByteOffset(static_cast<std::size_t>(row),
|
|
static_cast<std::size_t>(col));
|
|
std::size_t r = static_cast<std::size_t>(row);
|
|
std::size_t c = static_cast<std::size_t>(col);
|
|
std::size_t remaining = len;
|
|
const std::size_t lc = content_.LineCount();
|
|
|
|
while (remaining > 0 && r < lc) {
|
|
const std::string line = content_.GetLine(r); // logical line (without trailing '\n')
|
|
const std::size_t L = line.size();
|
|
if (c < L) {
|
|
const std::size_t take = std::min(remaining, L - c);
|
|
c += take;
|
|
remaining -= take;
|
|
}
|
|
if (remaining == 0)
|
|
break;
|
|
// Consume newline between lines as one char, if there is a next line
|
|
if (r + 1 < lc) {
|
|
remaining -= 1; // the newline
|
|
r += 1;
|
|
c = 0;
|
|
} else {
|
|
// At last line and still remaining: delete to EOF
|
|
const std::size_t total = content_.Size();
|
|
const std::size_t actual = (total > start) ? (total - start) : 0;
|
|
if (actual == 0)
|
|
return;
|
|
content_.Delete(start, actual);
|
|
rows_cache_dirty_ = true;
|
|
if (swap_rec_)
|
|
swap_rec_->OnDelete(row, col, actual);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Compute end offset at (r,c)
|
|
std::size_t end = content_.LineColToByteOffset(r, c);
|
|
if (end > start) {
|
|
const std::size_t actual = end - start;
|
|
content_.Delete(start, actual);
|
|
rows_cache_dirty_ = true;
|
|
if (swap_rec_)
|
|
swap_rec_->OnDelete(row, col, actual);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
Buffer::split_line(int row, const int col)
|
|
{
|
|
int c = col;
|
|
if (row < 0)
|
|
row = 0;
|
|
if (c < 0)
|
|
c = 0;
|
|
const std::size_t off = content_.LineColToByteOffset(static_cast<std::size_t>(row),
|
|
static_cast<std::size_t>(c));
|
|
const char nl = '\n';
|
|
content_.Insert(off, &nl, 1);
|
|
rows_cache_dirty_ = true;
|
|
if (swap_rec_)
|
|
swap_rec_->OnInsert(row, c, std::string_view("\n", 1));
|
|
}
|
|
|
|
|
|
void
|
|
Buffer::join_lines(int row)
|
|
{
|
|
if (row < 0)
|
|
row = 0;
|
|
std::size_t r = static_cast<std::size_t>(row);
|
|
if (r + 1 >= content_.LineCount())
|
|
return;
|
|
const int col = static_cast<int>(content_.GetLine(r).size());
|
|
// Delete the newline between line r and r+1
|
|
std::size_t end_of_line = content_.LineColToByteOffset(r, std::numeric_limits<std::size_t>::max());
|
|
// end_of_line now equals line end (clamped before newline). The newline should be exactly at this position.
|
|
content_.Delete(end_of_line, 1);
|
|
rows_cache_dirty_ = true;
|
|
if (swap_rec_)
|
|
swap_rec_->OnDelete(row, col, 1);
|
|
}
|
|
|
|
|
|
void
|
|
Buffer::insert_row(int row, const std::string_view text)
|
|
{
|
|
if (row < 0)
|
|
row = 0;
|
|
std::size_t off = content_.LineColToByteOffset(static_cast<std::size_t>(row), 0);
|
|
if (!text.empty())
|
|
content_.Insert(off, text.data(), text.size());
|
|
const char nl = '\n';
|
|
content_.Insert(off + text.size(), &nl, 1);
|
|
rows_cache_dirty_ = true;
|
|
if (swap_rec_) {
|
|
// Avoid allocation: emit the row text insertion (if any) and the newline insertion.
|
|
if (!text.empty())
|
|
swap_rec_->OnInsert(row, 0, text);
|
|
swap_rec_->OnInsert(row, static_cast<int>(text.size()), std::string_view("\n", 1));
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
Buffer::delete_row(int row)
|
|
{
|
|
if (row < 0)
|
|
row = 0;
|
|
std::size_t r = static_cast<std::size_t>(row);
|
|
if (r >= content_.LineCount())
|
|
return;
|
|
auto range = content_.GetLineRange(r); // [start,end)
|
|
// If not last line, ensure we include the separating newline by using end as-is (which points to next line start)
|
|
// If last line, end may equal total_size_. We still delete [start,end) which removes the last line content.
|
|
const std::size_t start = range.first;
|
|
const std::size_t end = range.second;
|
|
const std::size_t actual = (end > start) ? (end - start) : 0;
|
|
if (actual == 0)
|
|
return;
|
|
content_.Delete(start, actual);
|
|
rows_cache_dirty_ = true;
|
|
if (swap_rec_)
|
|
swap_rec_->OnDelete(row, 0, actual);
|
|
}
|
|
|
|
|
|
void
|
|
Buffer::replace_all_bytes(const std::string_view bytes)
|
|
{
|
|
content_.Clear();
|
|
if (!bytes.empty())
|
|
content_.Append(bytes.data(), bytes.size());
|
|
rows_cache_dirty_ = true;
|
|
}
|
|
|
|
|
|
// Undo system accessors
|
|
UndoSystem *
|
|
Buffer::Undo()
|
|
{
|
|
return undo_sys_.get();
|
|
}
|
|
|
|
|
|
const UndoSystem *
|
|
Buffer::Undo() const
|
|
{
|
|
return undo_sys_.get();
|
|
} |