php-kilo/src/Editor.php

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<?php declare(strict_types=1);
namespace Kilo;
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use ReflectionClass;
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trait MagicProperties {
abstract public function __get(string $name);
public function __set(string $name, $value)
{
if (property_exists($this, $name))
{
$this->$name = $value;
}
}
public function __isset(string $name): bool
{
return isset($this->$name);
}
}
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class Key {
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public const ARROW_DOWN = 'ARROW_DOWN';
public const ARROW_LEFT = 'ARROW_LEFT';
public const ARROW_RIGHT = 'ARROW_RIGHT';
public const ARROW_UP = 'ARROW_UP';
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public const BACKSPACE = 'BACKSPACE';
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public const DEL_KEY = 'DELETE';
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public const END_KEY = 'END';
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public const ENTER = 'ENTER';
public const ESCAPE = 'ESCAPE';
public const HOME_KEY = 'HOME';
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public const PAGE_DOWN = 'PAGE_DOWN';
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public const PAGE_UP = 'PAGE_UP';
public static function getConstList(): array
{
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return (new ReflectionClass(static::class))->getConstants();
}
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}
class Highlight {
public const NORMAL = 0;
public const NUMBER = 1;
public const MATCH = 2;
}
function syntax_to_color(int $hl): int
{
switch ($hl)
{
case Highlight::NUMBER:
return 31; // Foreground Red
case Highlight::MATCH:
return 34; // Foreground Blue
default:
return 37; // Foreground White
}
}
/**
* @property-read int size
* @property-read int rsize
*/
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class Row {
use MagicProperties;
public string $chars = '';
public string $render = '';
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public array $hl = [];
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public static function new(string $chars): self
{
return new self($chars);
}
private function __construct($chars)
{
$this->chars = $chars;
}
public function __get(string $name)
{
switch ($name)
{
case 'size':
return strlen($this->chars);
case 'rsize':
return strlen($this->render);
default:
return NULL;
}
}
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public function __toString(): string
{
return $this->chars . "\n";
}
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public function update(): void
{
$idx = 0;
for ($i = 0; $i < $this->size; $i++)
{
if ($this->chars[$i] === "\t")
{
$this->render[$idx++] = ' ';
while ($idx % KILO_TAB_STOP !== 0)
{
$this->render[$idx++] = ' ';
}
}
else
{
$this->render[$idx++] = $this->chars[$i];
}
}
$this->updateSyntax();
}
// ------------------------------------------------------------------------
// ! Syntax Highlighting
// ------------------------------------------------------------------------
protected function updateSyntax(): void
{
$this->hl = array_fill(0, $this->rsize, Highlight::NORMAL);
for ($i = 0; $i < $this->rsize; $i++)
{
if (is_digit($this->render[$i]))
{
$this->hl[$i] = Highlight::NUMBER;
}
}
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}
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}
/**
* @property-read int numRows
*/
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class Editor {
use MagicProperties;
private string $ab = '';
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protected int $cursorX = 0;
protected int $cursorY = 0;
protected int $renderX = 0;
protected int $rowOffset = 0;
protected int $colOffset = 0;
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protected int $screenRows = 0;
protected int $screenCols = 0;
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/**
* Array of Row objects
*/
protected array $rows = [];
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protected int $dirty = 0;
protected string $filename = '';
protected string $statusMsg = '';
protected int $statusMsgTime;
public static function new(): Editor
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{
return new self();
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}
private function __construct()
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{
$this->statusMsgTime = time();
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[$this->screenRows, $this->screenCols] = get_window_size();
$this->screenRows -= 2;
// print_r($this); die();
}
public function __get(string $name)
{
if ($name === 'numRows')
{
return count($this->rows);
}
return NULL;
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}
// ------------------------------------------------------------------------
// ! Terminal
// ------------------------------------------------------------------------
protected function readKey(): string
{
$c = read_stdin();
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// @TODO Make this more DRY
switch ($c)
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{
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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;
case "\x1b[D": return Key::ARROW_LEFT;
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case "\x1b[3~": return Key::DEL_KEY;
case "\x1b[5~": return Key::PAGE_UP;
case "\x1b[6~": return Key::PAGE_DOWN;
case "\x1bOH":
case "\x1b[1~":
case "\x1b[7~":
case "\x1b[H":
return Key::HOME_KEY;
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case "\x1bOF":
case "\x1b[4~":
case "\x1b[8~":
case "\x1b[F":
return Key::END_KEY;
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case "\x1b":
return Key::ESCAPE;
default: return $c;
}
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}
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// ------------------------------------------------------------------------
// ! Row Operations
// ------------------------------------------------------------------------
protected function rowCxToRx(Row $row, int $cx): int
{
$rx = 0;
for ($i = 0; $i < $cx; $i++)
{
if ($row->chars[$i] === "\t")
{
$rx += (KILO_TAB_STOP - 1) - ($rx % KILO_TAB_STOP);
}
$rx++;
}
return $rx;
}
protected function rowRxToCx(Row $row, int $rx): int
{
$cur_rx = 0;
for ($cx = 0; $cx < $row->size; $cx++)
{
if ($row->chars[$cx] === "\t")
{
$cur_rx += (KILO_TAB_STOP - 1) - ($cur_rx % KILO_TAB_STOP);
}
$cur_rx++;
if ($cur_rx > $rx)
{
return $cx;
}
}
return $cx;
}
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protected function insertRow(int $at, string $s): void
{
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if ($at < 0 || $at > $this->numRows)
{
return;
}
$row = Row::new($s);
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if ($at === $this->numRows)
{
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$this->rows[] = $row;
}
else
{
$this->rows = [
...array_slice($this->rows, 0, $at),
$row,
...array_slice($this->rows, $at),
];
}
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$this->rows[$at]->update();
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$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, $at);
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$row->update();
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$this->dirty++;
}
protected function rowAppendString(Row $row, string $s): void
{
$row->chars .= $s;
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$row->update();
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$this->dirty++;
}
protected function rowDeleteChar(Row $row, int $at): void
{
if ($at < 0 || $at >= $row->size)
{
return;
}
$row->chars = substr_replace($row->chars, '', $at, 1);
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$row->update();
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$this->dirty++;
}
// ------------------------------------------------------------------------
// ! Editor Operations
// ------------------------------------------------------------------------
protected function insertChar(string $c): void
{
if ($this->cursorY === $this->numRows)
{
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$this->insertRow($this->numRows, '');
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}
$this->rowInsertChar($this->rows[$this->cursorY], $this->cursorX, $c);
$this->cursorX++;
}
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protected function insertNewline(): void
{
if ($this->cursorX === 0)
{
$this->insertRow($this->cursorY, '');
}
else
{
$row = $this->rows[$this->cursorY];
// Add a new row, with the contents from the cursor to the end of the line
$this->insertRow($this->cursorY + 1, substr($row->chars, $this->cursorX));
// Update the (now previous) row
$row->chars = substr($row->chars, 0, $this->cursorX);
$row->update();
}
$this->cursorY++;
$this->cursorX = 0;
}
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protected function deleteChar(): void
{
if ($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);
$this->cursorY--;
}
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}
// ------------------------------------------------------------------------
// ! File I/O
// ------------------------------------------------------------------------
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protected function rowsToString(): string
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{
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$lines = [];
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foreach ($this->rows as $row)
{
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$lines[] = (string)$row;
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}
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return implode('', $lines);
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}
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public function open(string $filename): void
{
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// Copy filename for display
$this->filename = $filename;
// Determine the full path to the file
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/* $baseFile = basename($filename);
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$basePath = str_replace($baseFile, '', $filename);
$path = (is_dir($basePath)) ? $basePath : getcwd();
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$fullname = $path . '/' . $baseFile; */
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// #TODO gracefully handle issues with loading a file
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$handle = fopen($filename, 'rb');
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if ($handle === FALSE)
{
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write_stdout("\x1b[2J"); // Clear the screen
write_stdout("\x1b[H"); // Reposition cursor to top-left
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disableRawMode();
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print_r(error_get_last());
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die();
}
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while (($line = fgets($handle)) !== FALSE)
{
// Remove line endings when reading the file
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$this->insertRow($this->numRows, rtrim($line));
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}
fclose($handle);
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$this->dirty = 0;
}
protected function save(): void
{
if ($this->filename === '')
{
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$newFilename = $this->prompt('Save as: %s');
if ($newFilename === '')
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{
$this->setStatusMessage('Save aborted');
return;
}
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$this->filename = $newFilename;
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}
$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']);
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}
// ------------------------------------------------------------------------
// ! Find
// ------------------------------------------------------------------------
protected function findCallback(string $query, string $key): void
{
static $lastMatch = -1;
static $direction = 1;
if ($key === "\r" || $key === "\x1b")
{
$lastMatch = -1;
$direction = 1;
return;
}
if ($key === Key::ARROW_RIGHT || $key === Key::ARROW_DOWN)
{
$direction = 1;
}
else if ($key === Key::ARROW_LEFT || $key === Key::ARROW_UP)
{
$direction = -1;
}
else
{
$lastMatch = -1;
$direction = 1;
}
if ($lastMatch === -1)
{
$direction = 1;
}
$current = $lastMatch;
for ($i = 0; $i < $this->numRows; $i++)
{
$current += $direction;
if ($current === -1)
{
$current = $this->numRows - 1;
}
else if ($current === $this->numRows)
{
$current = 0;
}
$match = strpos($this->rows[$current]->render, $query);
if ($match !== FALSE)
{
$lastMatch = $current;
$this->cursorY = $current;
$this->cursorX = $this->rowRxToCx($this->rows[$current], $match);
$this->rowOffset = $this->numRows;
break;
}
}
}
protected function find(): void
{
$savedCx = $this->cursorX;
$savedCy = $this->cursorY;
$savedColOff = $this->colOffset;
$savedRowOff = $this->rowOffset;
$query = $this->prompt('Search: %s (Use ESC/Arrows/Enter)', [$this, 'findCallback']);
// If they pressed escape, the query will be empty,
// restore original cursor and scroll locations
if ($query === '')
{
$this->cursorX = $savedCx;
$this->cursorY = $savedCy;
$this->colOffset = $savedColOff;
$this->rowOffset = $savedRowOff;
}
}
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// ------------------------------------------------------------------------
// ! Output
// ------------------------------------------------------------------------
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protected function scroll(): void
{
$this->renderX = 0;
if ($this->cursorY < $this->numRows)
{
$this->renderX = $this->rowCxToRx($this->rows[$this->cursorY], $this->cursorX);
}
// Vertical Scrolling
if ($this->cursorY < $this->rowOffset)
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{
$this->rowOffset = $this->cursorY;
}
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if ($this->cursorY >= ($this->rowOffset + $this->screenRows))
{
$this->rowOffset = $this->cursorY - $this->screenRows + 1;
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}
// Horizontal Scrolling
if ($this->renderX < $this->colOffset)
{
$this->colOffset = $this->renderX;
}
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if ($this->renderX >= ($this->colOffset + $this->screenCols))
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{
$this->colOffset = $this->renderX - $this->screenCols + 1;
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}
}
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protected function drawRows(): void
{
for ($y = 0; $y < $this->screenRows; $y++)
{
$filerow = $y + $this->rowOffset;
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if ($filerow >= $this->numRows)
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{
if ($this->numRows === 0 && $y === $this->screenRows / 3)
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{
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$welcome = sprintf('PHP Kilo editor -- version %s', KILO_VERSION);
$welcomelen = strlen($welcome);
if ($welcomelen > $this->screenCols)
{
$welcomelen = $this->screenCols;
}
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$padding = ($this->screenCols - $welcomelen) / 2;
if ($padding > 0)
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{
$this->ab .= '~';
$padding--;
}
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for (; $padding >= 0; $padding--)
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{
$this->ab .= ' ';
}
$this->ab .= substr($welcome, 0, $welcomelen);
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}
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else
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{
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$this->ab .= '~';
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}
}
else
{
$len = $this->rows[$filerow]->rsize - $this->colOffset;
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if ($len < 0)
{
$len = 0;
}
if ($len > $this->screenCols)
{
$len = $this->screenCols;
}
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$c = substr($this->rows[$filerow]->render, $this->colOffset, $len);
$hl = array_slice($this->rows[$filerow]->hl, $this->colOffset, $len);
$currentColor = -1;
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for ($i = 0; $i < $len; $i++)
{
if ($hl[$i] === Highlight::NORMAL)
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{
if ($currentColor !== -1)
{
$this->ab .= "\x1b[39m";
$currentColor = -1;
}
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$this->ab .= $c[$i];
}
else
{
$color = syntax_to_color($hl[$i]);
if ($color !== $currentColor)
{
$currentColor = $color;
$this->ab .= sprintf("\x1b[%dm", $color);
}
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$this->ab .= $c[$i];
}
}
$this->ab .= "\x1b[39m";
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}
$this->ab .= "\x1b[K"; // Clear the current line
$this->ab .= "\r\n";
}
}
protected function drawStatusBar(): void
{
$this->ab .= "\x1b[7m";
$statusFilename = $this->filename !== '' ? $this->filename : '[No Name]';
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$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)
{
$len = $this->screenCols;
}
$this->ab .= substr($status, 0, $len);
while ($len < $this->screenCols)
{
if ($this->screenCols - $len === $rlen)
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{
$this->ab .= substr($rstatus, 0, $rlen);
break;
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}
$this->ab .= ' ';
$len++;
}
$this->ab .= "\x1b[m";
$this->ab .= "\r\n";
}
protected function drawMessageBar(): void
{
$this->ab .= "\x1b[K";
$len = strlen($this->statusMsg);
if ($len > $this->screenCols)
{
$len = $this->screenCols;
}
if ($len > 0 && (time() - $this->statusMsgTime) < 5)
{
$this->ab .= substr($this->statusMsg, 0, $len);
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}
}
public function refreshScreen(): void
{
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$this->scroll();
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$this->ab = '';
$this->ab .= "\x1b[?25l"; // Hide the cursor
$this->ab .= "\x1b[H"; // Reposition cursor to top-left
$this->drawRows();
$this->drawStatusBar();
$this->drawMessageBar();
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// Specify the current cursor position
$this->ab .= sprintf("\x1b[%d;%dH",
($this->cursorY - $this->rowOffset) + 1,
($this->renderX - $this->colOffset) + 1
);
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$this->ab .= "\x1b[?25h"; // Show the cursor
echo $this->ab;
}
public function setStatusMessage(string $fmt, ...$args): void
{
$this->statusMsg = (count($args) > 0)
? sprintf($fmt, ...$args)
: $fmt;
$this->statusMsgTime = time();
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}
// ------------------------------------------------------------------------
// ! Input
// ------------------------------------------------------------------------
protected function prompt(string $prompt, ?callable $callback = NULL): string
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{
$buffer = '';
$modifiers = Key::getConstList();
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while (TRUE)
{
$this->setStatusMessage($prompt, $buffer);
$this->refreshScreen();
$c = $this->readKey();
$cord = ord($c);
if ($c === Key::ESCAPE)
{
$this->setStatusMessage('');
if ($callback !== NULL)
{
$callback($buffer, $c);
}
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return '';
}
if ($c === Key::ENTER && $buffer !== '')
{
$this->setStatusMessage('');
if ($callback !== NULL)
{
$callback($buffer, $c);
}
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return $buffer;
}
if ($c === Key::DEL_KEY || $c === Key::BACKSPACE || $c === chr(ctrl_key('h')))
{
$buffer = substr($buffer, 0, -1);
}
else if (is_ascii($c) && ( ! is_cntrl($c)) && ! in_array($c, $modifiers, TRUE))
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{
$buffer .= $c;
}
if ($callback !== NULL)
{
$callback($buffer, $c);
}
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}
}
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protected function moveCursor(string $key): void
{
$row = ($this->cursorY >= $this->numRows)
? NULL
: $this->rows[$this->cursorY];
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switch ($key)
{
case Key::ARROW_LEFT:
if ($this->cursorX !== 0)
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{
$this->cursorX--;
}
else if ($this->cursorX > 0)
{
$this->cursorY--;
$this->cursorX = $this->rows[$this->cursorY]->size;
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}
break;
case Key::ARROW_RIGHT:
if ($row && $this->cursorX < $row->size)
{
$this->cursorX++;
}
else if ($row && $this->cursorX === $row->size)
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{
$this->cursorY++;
$this->cursorX = 0;
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}
break;
case Key::ARROW_UP:
if ($this->cursorY !== 0)
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{
$this->cursorY--;
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}
break;
case Key::ARROW_DOWN:
if ($this->cursorY < $this->numRows)
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{
$this->cursorY++;
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}
break;
}
$row = ($this->cursorY >= $this->numRows)
? NULL
: $this->rows[$this->cursorY];
$rowlen = $row ? $row->size : 0;
if ($this->cursorX > $rowlen)
{
$this->cursorX = $rowlen;
}
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}
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public function processKeypress(): ?string
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{
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static $quit_times = KILO_QUIT_TIMES;
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$c = $this->readKey();
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if ($c === "\0")
{
return '';
}
switch ($c)
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{
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case Key::ENTER:
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$this->insertNewline();
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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;
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case Key::HOME_KEY:
$this->cursorX = 0;
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break;
case Key::END_KEY:
if ($this->cursorY < $this->numRows)
{
$this->cursorX = $this->rows[$this->cursorY]->size - 1;
}
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break;
case chr(ctrl_key('f')):
$this->find();
break;
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case Key::BACKSPACE:
case chr(ctrl_key('h')):
case Key::DEL_KEY:
if ($c === Key::DEL_KEY)
{
$this->moveCursor(Key::ARROW_RIGHT);
}
$this->deleteChar();
break;
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case Key::PAGE_UP:
case Key::PAGE_DOWN:
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$this->pageUpOrDown($c);
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break;
case Key::ARROW_UP:
case Key::ARROW_DOWN:
case Key::ARROW_LEFT:
case Key::ARROW_RIGHT:
$this->moveCursor($c);
break;
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case chr(ctrl_key('l')):
case Key::ESCAPE:
// Do nothing
break;
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default:
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$this->insertChar($c);
break;
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}
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$quit_times = KILO_QUIT_TIMES;
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return $c;
}
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private function pageUpOrDown(string $c): void
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{
if ($c === Key::PAGE_UP)
{
$this->cursorY = $this->rowOffset;
}
else if ($c === Key::PAGE_DOWN)
{
$this->cursorY = $this->rowOffset + $this->screenRows - 1;
if ($this->cursorY > $this->numRows)
{
$this->cursorY = $this->numRows;
}
}
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$times = $this->screenRows;
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for (; $times > 0; $times--)
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{
$this->moveCursor($c === Key::PAGE_UP ? Key::ARROW_UP : Key::ARROW_DOWN);
}
}
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}