timw4mail/php-kilo
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This commit is contained in:
Timothy Warren 2019-10-22 12:09:11 -04:00
parent e9cdc17322
commit 34d96e73a6
3 changed files with 182 additions and 15 deletions
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2
kilo
View File

@ -20,7 +20,7 @@ function main(int $argc, array $argv): int
$editor->open($argv[1]);
}
$editor->setStatusMessage('HELP: Ctrl-Q = quit');
$editor->setStatusMessage('HELP: Ctrl-S = save | Ctrl-Q = quit');
// Input Loop
while (true)

194
src/Editor.php
View File

@ -22,15 +22,18 @@ trait MagicProperties {
}
class Key {
public const ARROW_DOWN = 'ARROW_DOWN';
public const ARROW_LEFT = 'ARROW_LEFT';
public const ARROW_RIGHT = 'ARROW_RIGHT';
public const ARROW_UP = 'ARROW_UP';
public const ARROW_DOWN = 'ARROW_DOWN';
public const BACKSPACE = 'BACKSPACE';
public const DEL_KEY = 'DEL';
public const HOME_KEY = 'HOME';
public const END_KEY = 'END';
public const PAGE_UP = 'PAGE_UP';
public const ENTER = 'ENTER';
public const ESCAPE = 'ESCAPE';
public const HOME_KEY = 'HOME';
public const PAGE_DOWN = 'PAGE_DOWN';
public const PAGE_UP = 'PAGE_UP';
}
/**
@ -91,6 +94,7 @@ class Editor {
*/
protected array $rows = [];
protected int $dirty = 0;
protected string $filename = '';
protected string $statusMsg = '';
protected int $statusMsgTime;
@ -135,6 +139,10 @@ class Editor {
// @TODO Make this more DRY
switch ($c)
{
case "\x7f": return Key::BACKSPACE;
case "\r": return Key::ENTER;
case "\x1b[A": return Key::ARROW_UP;
case "\x1b[B": return Key::ARROW_DOWN;
case "\x1b[C": return Key::ARROW_RIGHT;
@ -157,6 +165,9 @@ class Editor {
case "\x1b[F":
return Key::END_KEY;
case "\x1b":
return Key::ESCAPE;
default: return $c;
}
}
@ -248,17 +259,112 @@ class Editor {
$at = $this->numRows;
$this->rows[$at] = Row::new($s);
$this->updateRow($this->rows[$at]);
$this->dirty++;
}
protected function deleteRow(int $at): void
{
if ($at < 0 || $at >= $this->numRows)
{
return;
}
// Remove the row
unset($this->rows[$at]);
// Re-index the array of rows
$this->rows = array_values($this->rows);
$this->dirty++;
}
protected function rowInsertChar(Row $row, int $at, string $c): void
{
if ($at < 0 || $at > $row->size)
{
$at = $row->size;
}
// Safely insert into arbitrary position in the existing string
$row->chars = substr($row->chars, 0, $at) . $c . substr($row->chars, $at);
$this->updateRow($row);
$this->dirty++;
}
protected function rowAppendString(Row $row, string $s): void
{
$row->chars .= $s;
$this->updateRow($row);
$this->dirty++;
}
protected function rowDeleteChar(Row $row, int $at): void
{
if ($at < 0 || $at >= $row->size)
{
return;
}
$row->chars = substr_replace($row->chars, '', $at, 1);
$this->updateRow($row);
$this->dirty++;
}
// ------------------------------------------------------------------------
// ! Editor Operations
// ------------------------------------------------------------------------
protected function insertChar(string $c): void
{
if ($this->cursorY === $this->numRows)
{
$this->appendRow('');
}
$this->rowInsertChar($this->rows[$this->cursorY], $this->cursorX, $c);
$this->cursorX++;
}
protected function deleteChar(): void
{
if ($this->cursorY === $this->numRows || ($this->cursorX === 0 && $this->cursorY === 0))
{
return;
}
$row = $this->rows[$this->cursorY];
if ($this->cursorX > 0)
{
$this->rowDeleteChar($row, $this->cursorX - 1);
$this->cursorX--;
}
else
{
$this->cursorX = $this->rows[$this->cursorY - 1]->size;
$this->rowAppendString($this->rows[$this->cursorY -1], $row->chars);
$this->deleteRow($this->cursorY);
$this->cursorY--;
}
}
// ------------------------------------------------------------------------
// ! File I/O
// ------------------------------------------------------------------------
protected function rowsToString(): string
{
$str = '';
foreach ($this->rows as $row)
{
$str .= $row->chars . "\n";
}
return $str;
}
public function open(string $filename): void
{
// Copy filename for display
$this->filename = $filename;
// Determine the full path to the file
$baseFile = basename($filename);
$basePath = str_replace($baseFile, '', $filename);
@ -266,6 +372,8 @@ class Editor {
$fullname = $path . '/' . $baseFile;
// Copy filename for display
$this->filename = $fullname;
// #TODO gracefully handle issues with loading a file
$handle = fopen($fullname, 'rb');
@ -273,10 +381,32 @@ class Editor {
while (($line = fgets($handle)) !== FALSE)
{
// Remove line endings when reading the file
$this->appendRow(rtrim($line));
$this->appendRow(rtrim($line, "\n\r\0"));
}
fclose($handle);
$this->dirty = 0;
}
protected function save(): void
{
if ($this->filename === '')
{
return;
}
$contents = $this->rowsToString();
$res = file_put_contents($this->filename, $contents);
if ($res === strlen($contents))
{
$this->setStatusMessage('%d bytes written to disk', strlen($contents));
$this->dirty = 0;
return;
}
$this->setStatusMessage('Failed to save! I/O error: %s', error_get_last()['message']);
}
// ------------------------------------------------------------------------
@ -371,8 +501,9 @@ class Editor {
$this->ab .= "\x1b[7m";
$statusFilename = $this->filename !== '' ? $this->filename : '[No Name]';
$status = sprintf("%.20s - %d lines", $statusFilename, $this->numRows);
$rstatus = sprintf("%d/%d", $this->cursorY + 1, $this->numRows);
$isDirty = ($this->dirty > 0) ? '(modified)' : '';
$status = sprintf('%.20s - %d lines %s', $statusFilename, $this->numRows, $isDirty);
$rstatus = sprintf('%d/%d', $this->cursorY + 1, $this->numRows);
$len = strlen($status);
$rlen = strlen($rstatus);
if ($len > $this->screenCols)
@ -505,6 +636,8 @@ class Editor {
public function processKeypress(): ?string
{
static $quit_times = KILO_QUIT_TIMES;
$c = $this->readKey();
if ($c === "\0")
@ -514,6 +647,27 @@ class Editor {
switch ($c)
{
case Key::ENTER:
// TODO
break;
case chr(ctrl_key('q')):
if ($this->dirty > 0 && $quit_times > 0)
{
$this->setStatusMessage('WARNING!!! File has unsaved changes.' .
'Press Ctrl-Q %d more times to quit.', $quit_times);
$quit_times--;
return '';
}
write_stdout("\x1b[2J"); // Clear the screen
write_stdout("\x1b[H"); // Reposition cursor to top-left
return NULL;
break;
case chr(ctrl_key('s')):
$this->save();
break;
case Key::HOME_KEY:
$this->cursorX = 0;
break;
@ -525,6 +679,16 @@ class Editor {
}
break;
case Key::BACKSPACE:
case chr(ctrl_key('h')):
case Key::DEL_KEY:
if ($c === Key::DEL_KEY)
{
$this->moveCursor(Key::ARROW_RIGHT);
}
$this->deleteChar();
break;
case Key::PAGE_UP:
case Key::PAGE_DOWN:
$this->pageUpOrDown($c);
@ -537,16 +701,18 @@ class Editor {
$this->moveCursor($c);
break;
case chr(ctrl_key('q')):
write_stdout("\x1b[2J"); // Clear the screen
write_stdout("\x1b[H"); // Reposition cursor to top-left
return NULL;
case chr(ctrl_key('l')):
case Key::ESCAPE:
// Do nothing
break;
default:
return $c;
$this->insertChar($c);
break;
}
$quit_times = KILO_QUIT_TIMES;
return $c;
}

1
src/constants.php
View File

@ -7,6 +7,7 @@ namespace Kilo;
// -----------------------------------------------------------------------------
define('KILO_VERSION', '0.0.1');
define('KILO_TAB_STOP', 4);
define('KILO_QUIT_TIMES', 3);
// -----------------------------------------------------------------------------
// ! Misc I/O constants