799 lines
17 KiB
PHP
799 lines
17 KiB
PHP
<?php declare(strict_types=1);
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namespace Aviat\Kilo;
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use Aviat\Kilo\Type\TerminalSize;
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use Aviat\Kilo\Enum\{
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Color,
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RawKeyCode,
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KeyType,
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Highlight,
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SearchDirection
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};
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use Aviat\Kilo\Type\{Point, StatusMessage};
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/**
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* // Don't highlight this!
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*/
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class Editor {
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/**
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* @var string The screen buffer
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*/
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private string $outputBuffer = '';
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/**
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* @var Point The 0-based location of the cursor in the current viewport
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*/
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protected Point $cursor;
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/**
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* @var Point The scroll offset of the file in the current viewport
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*/
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protected Point $offset;
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/**
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* @var Document The document being edited
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*/
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protected Document $document;
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/**
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* @var StatusMessage A disappearing status message
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*/
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protected StatusMessage $statusMessage;
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/**
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* @var TerminalSize The size of the terminal in rows and columns
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*/
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protected TerminalSize $terminalSize;
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/**
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* @var int The rendered cursor position
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*/
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protected int $renderX = 0;
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/**
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* @var bool Should we stop the rendering loop?
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*/
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protected bool $shouldQuit = false;
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/**
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* @var int The number of times to confirm you wish to quit
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*/
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protected int $quitTimes = KILO_QUIT_TIMES;
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/**
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* Create the Editor instance with CLI arguments
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*
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* @param int $argc
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* @param array $argv
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* @return Editor
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*/
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public static function new(int $argc = 0, array $argv = []): Editor
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{
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if ($argc >= 2 && ! empty($argv[1]))
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{
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return new self($argv[1]);
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}
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return new self();
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}
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/**
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* The real constructor, ladies and gentlemen
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*
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* @param string|null $filename
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*/
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private function __construct(?string $filename = NULL)
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{
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$this->statusMessage = StatusMessage::from('HELP: Ctrl-S = save | Ctrl-Q = quit | Ctrl-F = find');
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$this->cursor = Point::new();
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$this->offset = Point::new();
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$this->terminalSize = Terminal::size();
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if (is_string($filename))
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{
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$maybeDocument = Document::new()->open($filename);
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if ($maybeDocument === NULL)
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{
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$this->document = Document::new();
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$this->setStatusMessage("ERR: Could not open file: {}", $filename);
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}
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else
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{
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$this->document = $maybeDocument;
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}
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}
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else
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{
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$this->document = Document::new();
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}
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}
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public function __debugInfo(): array
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{
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return [
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'cursor' => $this->cursor,
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'document' => $this->document,
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'offset' => $this->offset,
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'renderX' => $this->renderX,
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'terminalSize' => $this->terminalSize,
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'statusMessage' => $this->statusMessage,
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];
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}
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/**
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* Start the input loop
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*/
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public function run(): void
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{
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while ( ! $this->shouldQuit)
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{
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$this->refreshScreen();
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$this->processKeypress();
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}
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}
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/**
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* Set a status message to be displayed, using printf formatting
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* @param string $fmt
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* @param mixed ...$args
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*/
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public function setStatusMessage(string $fmt, mixed ...$args): void
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{
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$text = func_num_args() > 1
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? sprintf($fmt, ...$args)
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: $fmt;
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$this->statusMessage = StatusMessage::from($text);
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}
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// ------------------------------------------------------------------------
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// ! Row Operations
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// ------------------------------------------------------------------------
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/**
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* Cursor X to Render X
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*
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* @param Row $row
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* @param int $cx
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* @return int
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*/
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protected function rowCxToRx(Row $row, int $cx): int
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{
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$rx = 0;
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for ($i = 0; $i < $cx; $i++)
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{
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if ($row->chars[$i] === RawKeyCode::TAB)
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{
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$rx += (KILO_TAB_STOP - 1) - ($rx % KILO_TAB_STOP);
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}
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$rx++;
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}
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return $rx;
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}
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/**
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* Render X to Cursor X
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*
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* @param Row $row
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* @param int $rx
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* @return int
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*/
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protected function rowRxToCx(Row $row, int $rx): int
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{
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$cur_rx = 0;
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for ($cx = 0; $cx < $row->size; $cx++)
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{
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if ($row->chars[$cx] === RawKeyCode::TAB)
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{
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$cur_rx += (KILO_TAB_STOP - 1) - ($cur_rx % KILO_TAB_STOP);
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}
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$cur_rx++;
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if ($cur_rx > $rx)
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{
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return $cx;
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}
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}
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return $cx;
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}
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// ------------------------------------------------------------------------
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// ! File I/O
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// ------------------------------------------------------------------------
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protected function save(): void
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{
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if ($this->document->filename === '')
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{
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$newFilename = $this->prompt('Save as: %s');
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if ($newFilename === '')
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{
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$this->setStatusMessage('Save aborted');
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return;
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}
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$this->document->filename = $newFilename;
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}
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$res = $this->document->save();
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if ($res !== FALSE)
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{
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$this->setStatusMessage('%d bytes written to disk', $res);
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return;
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}
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$this->setStatusMessage('Failed to save! I/O error: %s', error_get_last()['message'] ?? '');
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}
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// ------------------------------------------------------------------------
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// ! Find
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// ------------------------------------------------------------------------
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protected function findCallback(string $query, string $key): void
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{
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static $lastMatch = NO_MATCH;
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static $direction = SearchDirection::FORWARD;
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static $savedHlLine = 0;
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static $savedHl = [];
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if ( ! empty($savedHl))
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{
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$row = $this->document->row($savedHlLine);
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if ($row->isValid())
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{
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$row->hl = $savedHl;
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}
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$savedHl = [];
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}
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$direction = match ($key) {
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KeyType::ARROW_UP, KeyType::ARROW_LEFT => SearchDirection::BACKWARD,
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default => SearchDirection::FORWARD
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};
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$arrowKeys = [KeyType::ARROW_UP, KeyType::ARROW_DOWN, KeyType::ARROW_LEFT, KeyType::ARROW_RIGHT];
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// Reset search state with non arrow-key input
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if ( ! in_array($key, $arrowKeys, true))
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{
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$lastMatch = NO_MATCH;
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$direction = SearchDirection::FORWARD;
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if ($key === RawKeyCode::ENTER || $key === RawKeyCode::ESCAPE)
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{
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return;
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}
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}
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if ($lastMatch === NO_MATCH)
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{
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$direction = SearchDirection::FORWARD;
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}
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$current = (int)$lastMatch;
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if (empty($query))
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{
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return;
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}
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for ($i = 0; $i < $this->document->numRows; $i++)
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{
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$current += $direction;
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if ($current === -1)
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{
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$current = $this->document->numRows - 1;
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}
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else if ($current === $this->document->numRows)
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{
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$current = 0;
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}
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$row = $this->document->row($current);
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if ( ! $row->isValid())
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{
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break;
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}
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$match = strpos($row->render, $query);
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if ($match !== FALSE)
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{
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$lastMatch = $current;
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$this->cursor->y = (int)$current;
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$this->cursor->x = $this->rowRxToCx($row, $match);
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$this->offset->y = $this->document->numRows;
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$savedHlLine = $current;
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$savedHl = $row->hl;
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// Update the highlight array of the relevant row with the 'MATCH' type
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array_replace_range($row->hl, $match, strlen($query), Highlight::MATCH);
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break;
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}
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}
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}
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protected function find(): void
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{
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$savedCursor = Point::from($this->cursor);
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$savedOffset = Point::from($this->offset);
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$query = $this->prompt('Search: %s (Use ESC/Arrows/Enter)', [$this, 'findCallback']);
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// If they pressed escape, the query will be empty,
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// restore original cursor and scroll locations
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if ($query === '')
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{
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$this->cursor = Point::from($savedCursor);
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$this->offset = Point::from($savedOffset);
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}
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}
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// ------------------------------------------------------------------------
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// ! Output
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// ------------------------------------------------------------------------
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protected function scroll(): void
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{
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$this->renderX = 0;
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if ($this->cursor->y < $this->document->numRows)
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{
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$row = $this->document->row($this->cursor->y);
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if ($row->isValid())
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{
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$this->renderX = $this->rowCxToRx($row, $this->cursor->x);
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}
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}
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// Vertical Scrolling
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if ($this->cursor->y < $this->offset->y)
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{
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$this->offset->y = $this->cursor->y;
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}
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else if ($this->cursor->y >= ($this->offset->y + $this->terminalSize->rows))
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{
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$this->offset->y = $this->cursor->y - $this->terminalSize->rows + 1;
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}
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// Horizontal Scrolling
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if ($this->renderX < $this->offset->x)
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{
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$this->offset->x = $this->renderX;
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}
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else if ($this->renderX >= ($this->offset->x + $this->terminalSize->cols))
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{
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$this->offset->x = $this->renderX - $this->terminalSize->cols + 1;
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}
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}
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protected function drawRows(): void
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{
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for ($y = 0; $y < $this->terminalSize->rows; $y++)
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{
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$fileRow = $y + $this->offset->y;
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$this->outputBuffer .= ANSI::CLEAR_LINE;
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($fileRow >= $this->document->numRows)
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? $this->drawPlaceholderRow($y)
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: $this->drawRow($fileRow);
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$this->outputBuffer .= "\r\n";
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}
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}
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protected function drawRow(int $rowIdx): void
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{
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$row = $this->document->row($rowIdx);
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if ( ! $row->isValid())
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{
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return;
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}
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$len = $row->rsize - $this->offset->x;
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if ($len < 0)
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{
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$len = 0;
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}
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if ($len > $this->terminalSize->cols)
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{
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$len = $this->terminalSize->cols;
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}
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$chars = substr($row->render, $this->offset->x, (int)$len);
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$hl = array_slice($row->hl, $this->offset->x, (int)$len);
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$currentColor = -1;
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for ($i = 0; $i < $len; $i++)
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{
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$ch = $chars[$i];
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// Handle 'non-printable' characters
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if (is_ctrl($ch))
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{
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$sym = (ord($ch) <= 26)
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? chr(ord('@') + ord($ch))
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: '?';
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$this->outputBuffer .= ANSI::color(Color::INVERT);
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$this->outputBuffer .= $sym;
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$this->outputBuffer .= ANSI::RESET_TEXT;
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if ($currentColor !== -1)
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{
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$this->outputBuffer .= ANSI::color($currentColor);
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}
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}
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else if ($hl[$i] === Highlight::NORMAL)
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{
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if ($currentColor !== -1)
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{
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$this->outputBuffer .= ANSI::RESET_TEXT;
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$this->outputBuffer .= ANSI::color(Color::FG_WHITE);
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$currentColor = -1;
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}
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$this->outputBuffer .= $ch;
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}
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else
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{
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$color = syntax_to_color($hl[$i]);
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if ($color !== $currentColor)
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{
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$currentColor = $color;
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$this->outputBuffer .= ANSI::RESET_TEXT;
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$this->outputBuffer .= ANSI::color($color);
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}
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$this->outputBuffer .= $ch;
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}
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}
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$this->outputBuffer .= ANSI::RESET_TEXT;
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$this->outputBuffer .= ANSI::color(Color::FG_WHITE);
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}
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protected function drawPlaceholderRow(int $y): void
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{
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if ($this->document->numRows === 0 && $y === (int)($this->terminalSize->rows / 2))
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{
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$welcome = sprintf('PHP Kilo editor -- version %s', KILO_VERSION);
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$welcomelen = strlen($welcome);
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if ($welcomelen > $this->terminalSize->cols)
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{
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$welcomelen = $this->terminalSize->cols;
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}
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$padding = ($this->terminalSize->cols - $welcomelen) / 2;
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if ($padding > 0)
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{
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$this->outputBuffer .= '~';
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$padding--;
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}
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for ($i = 0; $i < $padding; $i++)
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{
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$this->outputBuffer .= ' ';
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}
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$this->outputBuffer .= substr($welcome, 0, $welcomelen);
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}
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else
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{
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$this->outputBuffer .= '~';
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}
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}
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protected function drawStatusBar(): void
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{
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$this->outputBuffer .= ANSI::color(Color::INVERT);
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$statusFilename = $this->document->filename !== '' ? $this->document->filename : '[No Name]';
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$syntaxType = $this->document->fileType->name;
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$isDirty = $this->document->isDirty() ? '(modified)' : '';
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$status = sprintf('%.20s - %d lines %s', $statusFilename, $this->document->numRows, $isDirty);
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$rstatus = sprintf('%s | %d/%d', $syntaxType, $this->cursor->y + 1, $this->document->numRows);
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$len = strlen($status);
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$rlen = strlen($rstatus);
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if ($len > $this->terminalSize->cols)
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{
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$len = $this->terminalSize->cols;
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}
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$this->outputBuffer .= substr($status, 0, $len);
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while ($len < $this->terminalSize->cols)
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{
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if ($this->terminalSize->cols - $len === $rlen)
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{
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$this->outputBuffer .= substr($rstatus, 0, $rlen);
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break;
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}
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$this->outputBuffer .= ' ';
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$len++;
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}
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$this->outputBuffer .= ANSI::RESET_TEXT;
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$this->outputBuffer .= "\r\n";
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}
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|
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protected function drawMessageBar(): void
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{
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$this->outputBuffer .= ANSI::CLEAR_LINE;
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$len = $this->statusMessage->len;
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if ($len > $this->terminalSize->cols)
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{
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$len = $this->terminalSize->cols;
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}
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|
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// If there is a message, and it's been less than 5 seconds since
|
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// last screen update, show the message
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if ($len > 0 && (time() - $this->statusMessage->time) < 5)
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{
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$this->outputBuffer .= substr($this->statusMessage->text, 0, $len);
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}
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}
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|
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protected function refreshScreen(): void
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{
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$this->scroll();
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$this->outputBuffer = ANSI::HIDE_CURSOR . ANSI::RESET_CURSOR;
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$this->drawRows();
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$this->drawStatusBar();
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$this->drawMessageBar();
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|
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// Specify the current cursor position
|
|
$this->outputBuffer .= ANSI::moveCursor(
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$this->cursor->y - $this->offset->y,
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$this->renderX - $this->offset->x
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);
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$this->outputBuffer .= ANSI::SHOW_CURSOR;
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Terminal::write($this->outputBuffer, strlen($this->outputBuffer));
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}
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|
|
// ------------------------------------------------------------------------
|
|
// ! Input
|
|
// ------------------------------------------------------------------------
|
|
|
|
protected function prompt(string $prompt, ?callable $callback = NULL): string
|
|
{
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|
$buffer = '';
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$modifiers = KeyType::getConstList();
|
|
while (TRUE)
|
|
{
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$this->setStatusMessage($prompt, $buffer);
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$this->refreshScreen();
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|
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$c = Terminal::readKey();
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|
$isModifier = in_array($c, $modifiers, TRUE);
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|
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if ($c === KeyType::ESCAPE || ($c === RawKeyCode::ENTER && $buffer !== ''))
|
|
{
|
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$this->setStatusMessage('');
|
|
if ($callback !== NULL)
|
|
{
|
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$callback($buffer, $c);
|
|
}
|
|
return ($c === RawKeyCode::ENTER) ? $buffer : '';
|
|
}
|
|
|
|
if ($c === KeyType::DELETE || $c === KeyType::BACKSPACE)
|
|
{
|
|
$buffer = substr($buffer, 0, -1);
|
|
}
|
|
else if (is_ascii($c) && ( ! (is_ctrl($c) || $isModifier)))
|
|
{
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|
$buffer .= $c;
|
|
}
|
|
|
|
if ($callback !== NULL)
|
|
{
|
|
$callback($buffer, $c);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Input processing
|
|
*/
|
|
protected function processKeypress(): void
|
|
{
|
|
$c = Terminal::readKey();
|
|
|
|
if ($c === RawKeyCode::NULL || $c === RawKeyCode::EMPTY)
|
|
{
|
|
return;
|
|
}
|
|
|
|
switch ($c)
|
|
{
|
|
case RawKeyCode::CTRL('q'):
|
|
$this->quitAttempt();
|
|
return;
|
|
|
|
case RawKeyCode::CTRL('s'):
|
|
$this->save();
|
|
break;
|
|
|
|
case RawKeyCode::CTRL('f'):
|
|
$this->find();
|
|
break;
|
|
|
|
case KeyType::DELETE:
|
|
case KeyType::BACKSPACE:
|
|
$this->removeChar($c);
|
|
break;
|
|
|
|
case KeyType::ARROW_UP:
|
|
case KeyType::ARROW_DOWN:
|
|
case KeyType::ARROW_LEFT:
|
|
case KeyType::ARROW_RIGHT:
|
|
case KeyType::PAGE_UP:
|
|
case KeyType::PAGE_DOWN:
|
|
case KeyType::HOME:
|
|
case KeyType::END:
|
|
$this->moveCursor($c);
|
|
break;
|
|
|
|
case RawKeyCode::CTRL('l'):
|
|
case KeyType::ESCAPE:
|
|
// Do nothing
|
|
break;
|
|
|
|
default:
|
|
$this->insertChar($c);
|
|
break;
|
|
}
|
|
|
|
// Reset quit confirmation timer on different keypress
|
|
if ($this->quitTimes < KILO_QUIT_TIMES)
|
|
{
|
|
$this->quitTimes = KILO_QUIT_TIMES;
|
|
$this->setStatusMessage('');
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
// ! Editor operation helpers
|
|
// ------------------------------------------------------------------------
|
|
|
|
protected function moveCursor(string $key): void
|
|
{
|
|
$x = $this->cursor->x;
|
|
$y = $this->cursor->y;
|
|
$row = $this->document->row($y);
|
|
if ( ! $row->isValid())
|
|
{
|
|
return;
|
|
}
|
|
|
|
switch ($key)
|
|
{
|
|
case KeyType::ARROW_LEFT:
|
|
if ($x !== 0)
|
|
{
|
|
$x--;
|
|
}
|
|
else if ($y > 0)
|
|
{
|
|
// Beginning of a line, go to end of previous line
|
|
$y--;
|
|
$x = $row->size - 1;
|
|
}
|
|
break;
|
|
|
|
case KeyType::ARROW_RIGHT:
|
|
if ($x < $row->size)
|
|
{
|
|
$x++;
|
|
}
|
|
else if ($x === $row->size)
|
|
{
|
|
$y++;
|
|
$x = 0;
|
|
}
|
|
break;
|
|
|
|
case KeyType::ARROW_UP:
|
|
if ($y !== 0)
|
|
{
|
|
$y--;
|
|
}
|
|
break;
|
|
|
|
case KeyType::ARROW_DOWN:
|
|
if ($y < $this->document->numRows)
|
|
{
|
|
$y++;
|
|
}
|
|
break;
|
|
|
|
case KeyType::PAGE_UP:
|
|
$y = saturating_sub($y, $this->terminalSize->rows);
|
|
break;
|
|
|
|
case KeyType::PAGE_DOWN:
|
|
$y = saturating_add($y, $this->terminalSize->rows, $this->document->numRows);
|
|
break;
|
|
|
|
case KeyType::HOME:
|
|
$x = 0;
|
|
break;
|
|
|
|
case KeyType::END:
|
|
if ($y < $this->document->numRows)
|
|
{
|
|
$x = $row->size;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
// Do nothing
|
|
}
|
|
|
|
// Snap cursor to the end of a row when moving
|
|
// from a longer row to a shorter one
|
|
$row = $this->document->row($y);
|
|
if ($row->isValid())
|
|
{
|
|
if ($x > $row->size)
|
|
{
|
|
$x = $row->size;
|
|
}
|
|
|
|
$this->cursor->x = $x;
|
|
$this->cursor->y = $y;
|
|
}
|
|
}
|
|
|
|
protected function insertChar(string $c): void
|
|
{
|
|
$this->document->insert($this->cursor, $c);
|
|
$this->moveCursor(KeyType::ARROW_RIGHT);
|
|
}
|
|
|
|
protected function removeChar(string $ch): void
|
|
{
|
|
if ($ch === KeyType::DELETE)
|
|
{
|
|
$this->document->delete($this->cursor);
|
|
}
|
|
|
|
if ($ch === KeyType::BACKSPACE && ($this->cursor->x > 0 || $this->cursor->y > 0))
|
|
{
|
|
$this->moveCursor(KeyType::ARROW_LEFT);
|
|
$this->document->delete($this->cursor);
|
|
}
|
|
}
|
|
|
|
protected function quitAttempt(): void
|
|
{
|
|
if ($this->document->isDirty() && $this->quitTimes > 0)
|
|
{
|
|
if ($this->quitTimes === KILO_QUIT_TIMES)
|
|
{
|
|
Terminal::ding();
|
|
}
|
|
|
|
$this->setStatusMessage(
|
|
'WARNING!!! File has unsaved changes. Press Ctrl-Q %d more times to quit.',
|
|
$this->quitTimes
|
|
);
|
|
|
|
$this->quitTimes--;
|
|
return;
|
|
}
|
|
|
|
Terminal::clear();
|
|
|
|
$this->shouldQuit = true;
|
|
}
|
|
}
|