920 lines
19 KiB
PHP
920 lines
19 KiB
PHP
<?php declare(strict_types=1);
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namespace Aviat\Kilo;
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use Aviat\Kilo\Enum\{Color, KeyCode, KeyType, Highlight};
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use Aviat\Kilo\Tokens\PHP;
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/**
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* // Don't highlight this!
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* @property-read int numRows
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*/
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class Editor {
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use Traits\MagicProperties;
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private string $ab = '';
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protected int $cursorX = 0;
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protected int $cursorY = 0;
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protected int $renderX = 0;
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protected int $rowOffset = 0;
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protected int $colOffset = 0;
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protected int $screenRows = 0;
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protected int $screenCols = 0;
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/**
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* Array of Row objects
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*/
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public array $rows = [];
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public int $dirty = 0;
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public string $filename = '';
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protected string $statusMsg = '';
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protected int $statusMsgTime;
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public ?Syntax $syntax = NULL;
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// Tokens for highlighting PHP
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public array $tokens = [];
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public static function new(): Editor
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{
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return new self();
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}
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private function __construct()
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{
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$this->statusMsgTime = time();
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[$this->screenRows, $this->screenCols] = get_window_size();
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// Remove a row for the status bar, and one for the message bar
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$this->screenRows -= 2;
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}
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public function __get(string $name)
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{
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if ($name === 'numRows')
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{
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return count($this->rows);
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}
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return NULL;
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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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'colOffset' => $this->colOffset,
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'cursorX' => $this->cursorX,
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'cursorY' => $this->cursorY,
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'dirty' => $this->dirty,
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'filename' => $this->filename,
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'renderX' => $this->renderX,
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'rowOffset' => $this->rowOffset,
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'rows' => $this->rows,
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'screenCols' => $this->screenCols,
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'screenRows' => $this->screenRows,
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'statusMsg' => $this->statusMsg,
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'syntax' => $this->syntax,
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'tokens' => $this->tokens,
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];
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}
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// ------------------------------------------------------------------------
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// ! Terminal
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// ------------------------------------------------------------------------
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protected function readKey(): string
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{
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$c = read_stdin();
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$map = [
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// Unambiguous mappings
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KeyCode::ARROW_DOWN => KeyType::ARROW_DOWN,
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KeyCode::ARROW_LEFT => KeyType::ARROW_LEFT,
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KeyCode::ARROW_RIGHT => KeyType::ARROW_RIGHT,
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KeyCode::ARROW_UP => KeyType::ARROW_UP,
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KeyCode::DEL_KEY => KeyType::DEL_KEY,
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KeyCode::ENTER => KeyType::ENTER,
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KeyCode::ESCAPE => KeyType::ESCAPE,
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KeyCode::PAGE_DOWN => KeyType::PAGE_DOWN,
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KeyCode::PAGE_UP => KeyType::PAGE_UP,
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// Backspace
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KeyCode::CTRL('h') => KeyType::BACKSPACE,
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KeyCode::BACKSPACE => KeyType::BACKSPACE,
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// Home Key
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"\eOH" => KeyType::HOME_KEY,
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"\e[1~" => KeyType::HOME_KEY,
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"\e[7~" => KeyType::HOME_KEY,
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ANSI::RESET_CURSOR => KeyType::HOME_KEY,
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// End Key
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"\eOF" => KeyType::END_KEY,
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"\e[4~" => KeyType::END_KEY,
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"\e[8~" => KeyType::END_KEY,
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"\e[F" => KeyType::END_KEY,
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];
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return (array_key_exists($c, $map))
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? $map[$c]
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: $c;
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}
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protected function selectSyntaxHighlight(): void
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{
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$this->syntax = NULL;
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if (empty($this->filename))
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{
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return;
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}
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// In PHP, `strchr` and `strstr` are the same function
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$ext = (string)strstr(basename($this->filename), '.');
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foreach (get_file_syntax_map() as $syntax)
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{
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if (
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in_array($ext, $syntax->filematch, TRUE) ||
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in_array(basename($this->filename), $syntax->filematch, TRUE)
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) {
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$this->syntax = $syntax;
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// Pre-tokenize the file
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if ($this->syntax->filetype === 'PHP')
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{
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$this->tokens = PHP::getFileTokens($this->filename);
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}
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$this->refreshSyntax();
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return;
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}
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}
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}
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// ------------------------------------------------------------------------
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// ! Row Operations
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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[$i] === KeyCode::TAB)
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{
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$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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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[$cx] === KeyCode::TAB)
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{
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$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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protected function insertRow(int $at, string $s, bool $updateSyntax = TRUE): void
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{
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if ($at < 0 || $at > $this->numRows)
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{
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return;
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}
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$row = Row::new($this, $s, $at);
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if ($at === $this->numRows)
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{
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$this->rows[] = $row;
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}
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else
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{
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$this->rows = [
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...array_slice($this->rows, 0, $at),
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$row,
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...array_slice($this->rows, $at),
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];
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}
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ksort($this->rows);
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$this->rows[$at]->update();
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$this->dirty++;
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// Re-tokenize the file
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if ($updateSyntax)
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{
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$this->refreshPHPSyntax();
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}
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}
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protected function deleteRow(int $at): void
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{
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if ($at < 0 || $at >= $this->numRows)
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{
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return;
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}
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// Remove the row
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unset($this->rows[$at]);
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// Re-index the array of rows
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$this->rows = array_values($this->rows);
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for ($i = $at; $i < $this->numRows; $i++)
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{
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$this->rows[$i]->idx--;
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}
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// Re-tokenize the file
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$this->refreshPHPSyntax();
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$this->dirty++;
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}
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// ------------------------------------------------------------------------
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// ! Editor Operations
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// ------------------------------------------------------------------------
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protected function insertChar(string $c): void
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{
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if ($this->cursorY === $this->numRows)
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{
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$this->insertRow($this->numRows, '');
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}
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$this->rows[$this->cursorY]->insertChar($this->cursorX, $c);
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// Re-tokenize the file
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$this->refreshPHPSyntax();
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$this->cursorX++;
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}
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protected function insertNewline(): void
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{
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if ($this->cursorX === 0)
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{
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$this->insertRow($this->cursorY, '');
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}
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else
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{
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$row = $this->rows[$this->cursorY];
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$chars = $row->chars;
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$newChars = substr($chars, 0, $this->cursorX);
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// Truncate the previous row
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$row->chars = $newChars;
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// Add a new row, with the contents from the cursor to the end of the line
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$this->insertRow($this->cursorY + 1, substr($chars, $this->cursorX));
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}
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$this->cursorY++;
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$this->cursorX = 0;
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// Re-tokenize the file
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$this->refreshPHPSyntax();
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}
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protected function deleteChar(): void
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{
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if ($this->cursorY === $this->numRows || ($this->cursorX === 0 && $this->cursorY === 0))
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{
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return;
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}
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$row = $this->rows[$this->cursorY];
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if ($this->cursorX > 0)
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{
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$row->deleteChar($this->cursorX - 1);
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$this->cursorX--;
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}
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else
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{
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$this->cursorX = $this->rows[$this->cursorY - 1]->size;
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$this->rows[$this->cursorY -1]->appendString($row->chars);
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$this->deleteRow($this->cursorY);
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$this->cursorY--;
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}
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// Re-tokenize the file
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$this->refreshPHPSyntax();
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}
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// ------------------------------------------------------------------------
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// ! File I/O
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// ------------------------------------------------------------------------
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protected function rowsToString(): string
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{
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$lines = array_map(fn (Row $row) => (string)$row, $this->rows);
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return implode('', $lines);
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}
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public function open(string $filename): void
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{
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// Copy filename for display
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$this->filename = $filename;
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$this->selectSyntaxHighlight();
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$handle = fopen($filename, 'rb');
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if ($handle === FALSE)
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{
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$this->setStatusMessage('Failed to open file: %s', $filename);
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return;
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}
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while (($line = fgets($handle)) !== FALSE)
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{
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// Remove line endings when reading the file
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$this->insertRow($this->numRows, rtrim($line), FALSE);
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}
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fclose($handle);
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$this->dirty = 0;
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}
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protected function save(): void
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{
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if ($this->filename === '')
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{
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$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->filename = $newFilename;
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$this->selectSyntaxHighlight();
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}
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$contents = $this->rowsToString();
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$res = file_put_contents($this->filename, $contents);
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if ($res === strlen($contents))
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{
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$this->setStatusMessage('%d bytes written to disk', strlen($contents));
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$this->dirty = 0;
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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 = -1;
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static $direction = 1;
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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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$this->rows[$savedHlLine]->hl = $savedHl;
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$savedHl = [];
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}
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switch ($key)
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{
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case KeyCode::ENTER:
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case KeyCode::ESCAPE:
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$lastMatch = -1;
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$direction = 1;
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return;
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case KeyType::ARROW_DOWN:
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case KeyType::ARROW_RIGHT:
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$direction = 1;
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break;
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case KeyType::ARROW_UP:
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case KeyType::ARROW_LEFT:
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$direction = -1;
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break;
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default:
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$lastMatch = -1;
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$direction = 1;
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}
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if ($lastMatch === -1)
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{
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$direction = 1;
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}
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$current = $lastMatch;
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for ($i = 0; $i < $this->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 = $this->numRows - 1;
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}
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else if ($current === $this->numRows)
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{
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$current = 0;
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}
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$row =& $this->rows[$current];
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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->cursorY = $current;
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$this->cursorX = $this->rowRxToCx($row, $match);
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$this->rowOffset = $this->numRows;
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$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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$savedCx = $this->cursorX;
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$savedCy = $this->cursorY;
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$savedColOff = $this->colOffset;
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$savedRowOff = $this->rowOffset;
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$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->cursorX = $savedCx;
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$this->cursorY = $savedCy;
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$this->colOffset = $savedColOff;
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$this->rowOffset = $savedRowOff;
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}
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}
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// ------------------------------------------------------------------------
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// ! Output
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// ------------------------------------------------------------------------
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protected function scroll(): void
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{
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$this->renderX = 0;
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if ($this->cursorY < $this->numRows)
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{
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$this->renderX = $this->rowCxToRx($this->rows[$this->cursorY], $this->cursorX);
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}
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// Vertical Scrolling
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if ($this->cursorY < $this->rowOffset)
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{
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$this->rowOffset = $this->cursorY;
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}
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if ($this->cursorY >= ($this->rowOffset + $this->screenRows))
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{
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$this->rowOffset = $this->cursorY - $this->screenRows + 1;
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}
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// Horizontal Scrolling
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if ($this->renderX < $this->colOffset)
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{
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$this->colOffset = $this->renderX;
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}
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if ($this->renderX >= ($this->colOffset + $this->screenCols))
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{
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$this->colOffset = $this->renderX - $this->screenCols + 1;
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}
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}
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protected function drawRows(): void
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{
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for ($y = 0; $y < $this->screenRows; $y++)
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{
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$filerow = $y + $this->rowOffset;
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if ($filerow >= $this->numRows)
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{
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if ($this->numRows === 0 && $y === (int)($this->screenRows / 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 > $this->screenCols)
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{
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$welcomelen = $this->screenCols;
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}
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$padding = ($this->screenCols - $welcomelen) / 2;
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if ($padding > 0)
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{
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$this->ab .= '~';
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$padding--;
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}
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for ($i = 0; $i < $padding; $i++)
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{
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$this->ab .= ' ';
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}
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$this->ab .= substr($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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}
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}
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else
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{
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$len = $this->rows[$filerow]->rsize - $this->colOffset;
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if ($len < 0)
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{
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$len = 0;
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}
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if ($len > $this->screenCols)
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{
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$len = $this->screenCols;
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}
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$c = substr($this->rows[$filerow]->render, $this->colOffset, $len);
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$hl = array_slice($this->rows[$filerow]->hl, $this->colOffset, $len);
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$currentColor = -1;
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for ($i = 0; $i < $len; $i++)
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{
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// Handle 'non-printable' characters
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if (is_ctrl($c[$i]))
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{
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$sym = (ord($c[$i]) <= 26)
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? chr(ord('@') + ord($c[$i]))
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: '?';
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$this->ab .= ANSI::color(Color::INVERT);
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$this->ab .= $sym;
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$this->ab .= ANSI::RESET_TEXT;
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if ($currentColor !== -1)
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{
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$this->ab .= 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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$this->ab .= ANSI::RESET_TEXT;
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$this->ab .= ANSI::color(Color::FG_WHITE);
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$currentColor = -1;
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}
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$this->ab .= $c[$i];
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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->ab .= ANSI::RESET_TEXT;
|
|
$this->ab .= ANSI::color($color);
|
|
}
|
|
$this->ab .= $c[$i];
|
|
}
|
|
}
|
|
|
|
$this->ab .= ANSI::RESET_TEXT;
|
|
$this->ab .= ANSI::color(Color::FG_WHITE);
|
|
}
|
|
|
|
$this->ab .= ANSI::CLEAR_LINE;
|
|
$this->ab .= "\r\n";
|
|
}
|
|
}
|
|
|
|
protected function drawStatusBar(): void
|
|
{
|
|
$this->ab .= ANSI::color(Color::INVERT);
|
|
|
|
$statusFilename = $this->filename !== '' ? $this->filename : '[No Name]';
|
|
$syntaxType = ($this->syntax !== NULL) ? $this->syntax->filetype : 'no ft';
|
|
$isDirty = ($this->dirty > 0) ? '(modified)' : '';
|
|
$status = sprintf('%.20s - %d lines %s', $statusFilename, $this->numRows, $isDirty);
|
|
$rstatus = sprintf('%s | %d/%d', $syntaxType, $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)
|
|
{
|
|
$this->ab .= substr($rstatus, 0, $rlen);
|
|
break;
|
|
}
|
|
|
|
$this->ab .= ' ';
|
|
$len++;
|
|
}
|
|
$this->ab .= ANSI::RESET_TEXT;
|
|
$this->ab .= "\r\n";
|
|
}
|
|
|
|
protected function drawMessageBar(): void
|
|
{
|
|
$this->ab .= ANSI::CLEAR_LINE;
|
|
$len = strlen($this->statusMsg);
|
|
if ($len > $this->screenCols)
|
|
{
|
|
$len = $this->screenCols;
|
|
}
|
|
|
|
if ($len > 0 && (time() - $this->statusMsgTime) < 5)
|
|
{
|
|
$this->ab .= substr($this->statusMsg, 0, $len);
|
|
}
|
|
}
|
|
|
|
public function refreshScreen(): void
|
|
{
|
|
$this->scroll();
|
|
|
|
$this->ab = '';
|
|
|
|
$this->ab .= ANSI::HIDE_CURSOR;
|
|
$this->ab .= ANSI::RESET_CURSOR;
|
|
|
|
$this->drawRows();
|
|
$this->drawStatusBar();
|
|
$this->drawMessageBar();
|
|
|
|
// Specify the current cursor position
|
|
$this->ab .= ANSI::moveCursor(
|
|
($this->cursorY - $this->rowOffset) + 1,
|
|
($this->renderX - $this->colOffset) + 1
|
|
);
|
|
|
|
$this->ab .= ANSI::SHOW_CURSOR;
|
|
|
|
echo $this->ab;
|
|
}
|
|
|
|
public function setStatusMessage(string $fmt, ...$args): void
|
|
{
|
|
$this->statusMsg = (count($args) > 0)
|
|
? sprintf($fmt, ...$args)
|
|
: $fmt;
|
|
$this->statusMsgTime = time();
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
// ! Input
|
|
// ------------------------------------------------------------------------
|
|
|
|
protected function prompt(string $prompt, ?callable $callback = NULL): string
|
|
{
|
|
$buffer = '';
|
|
$modifiers = KeyType::getConstList();
|
|
while (TRUE)
|
|
{
|
|
$this->setStatusMessage($prompt, $buffer);
|
|
$this->refreshScreen();
|
|
|
|
$c = $this->readKey();
|
|
$isModifier = in_array($c, $modifiers, TRUE);
|
|
|
|
if ($c === KeyType::ESCAPE || ($c === KeyType::ENTER && $buffer !== ''))
|
|
{
|
|
$this->setStatusMessage('');
|
|
if ($callback !== NULL)
|
|
{
|
|
$callback($buffer, $c);
|
|
}
|
|
return '';
|
|
}
|
|
|
|
if ($c === KeyType::DEL_KEY || $c === KeyType::BACKSPACE)
|
|
{
|
|
$buffer = substr($buffer, 0, -1);
|
|
}
|
|
else if (is_ascii($c) && ( ! (is_ctrl($c) || $isModifier)))
|
|
{
|
|
$buffer .= $c;
|
|
}
|
|
|
|
if ($callback !== NULL)
|
|
{
|
|
$callback($buffer, $c);
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function moveCursor(string $key): void
|
|
{
|
|
$row = ($this->cursorY >= $this->numRows)
|
|
? NULL
|
|
: $this->rows[$this->cursorY];
|
|
|
|
switch ($key)
|
|
{
|
|
case KeyType::ARROW_LEFT:
|
|
if ($this->cursorX !== 0)
|
|
{
|
|
$this->cursorX--;
|
|
}
|
|
else if ($this->cursorX > 0)
|
|
{
|
|
$this->cursorY--;
|
|
$this->cursorX = $this->rows[$this->cursorY]->size;
|
|
}
|
|
break;
|
|
|
|
case KeyType::ARROW_RIGHT:
|
|
if ($row && $this->cursorX < $row->size)
|
|
{
|
|
$this->cursorX++;
|
|
}
|
|
else if ($row && $this->cursorX === $row->size)
|
|
{
|
|
$this->cursorY++;
|
|
$this->cursorX = 0;
|
|
}
|
|
break;
|
|
|
|
case KeyType::ARROW_UP:
|
|
if ($this->cursorY !== 0)
|
|
{
|
|
$this->cursorY--;
|
|
}
|
|
break;
|
|
|
|
case KeyType::ARROW_DOWN:
|
|
if ($this->cursorY < $this->numRows)
|
|
{
|
|
$this->cursorY++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
$row = ($this->cursorY >= $this->numRows)
|
|
? NULL
|
|
: $this->rows[$this->cursorY];
|
|
$rowlen = $row ? $row->size : 0;
|
|
if ($this->cursorX > $rowlen)
|
|
{
|
|
$this->cursorX = $rowlen;
|
|
}
|
|
}
|
|
|
|
public function processKeypress(): ?string
|
|
{
|
|
static $quit_times = KILO_QUIT_TIMES;
|
|
|
|
$c = $this->readKey();
|
|
|
|
if ($c === KeyCode::NULL || $c === KeyCode::EMPTY)
|
|
{
|
|
return '';
|
|
}
|
|
|
|
switch ($c)
|
|
{
|
|
case KeyType::ENTER:
|
|
$this->insertNewline();
|
|
break;
|
|
|
|
case KeyCode::CTRL('q'):
|
|
if ($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(ANSI::CLEAR_SCREEN);
|
|
write_stdout(ANSI::RESET_CURSOR);
|
|
return NULL;
|
|
break;
|
|
|
|
case KeyCode::CTRL('s'):
|
|
$this->save();
|
|
break;
|
|
|
|
case KeyType::HOME_KEY:
|
|
$this->cursorX = 0;
|
|
break;
|
|
|
|
case KeyType::END_KEY:
|
|
if ($this->cursorY < $this->numRows)
|
|
{
|
|
$this->cursorX = $this->rows[$this->cursorY]->size - 1;
|
|
}
|
|
break;
|
|
|
|
case KeyCode::CTRL('f'):
|
|
$this->find();
|
|
break;
|
|
|
|
case KeyType::BACKSPACE:
|
|
case KeyType::DEL_KEY:
|
|
if ($c === KeyType::DEL_KEY)
|
|
{
|
|
$this->moveCursor(KeyType::ARROW_RIGHT);
|
|
}
|
|
$this->deleteChar();
|
|
break;
|
|
|
|
case KeyType::PAGE_UP:
|
|
case KeyType::PAGE_DOWN:
|
|
$this->pageUpOrDown($c);
|
|
break;
|
|
|
|
case KeyType::ARROW_UP:
|
|
case KeyType::ARROW_DOWN:
|
|
case KeyType::ARROW_LEFT:
|
|
case KeyType::ARROW_RIGHT:
|
|
$this->moveCursor($c);
|
|
break;
|
|
|
|
case KeyCode::CTRL('l'):
|
|
case KeyType::ESCAPE:
|
|
// Do nothing
|
|
break;
|
|
|
|
default:
|
|
$this->insertChar($c);
|
|
break;
|
|
}
|
|
|
|
$quit_times = KILO_QUIT_TIMES;
|
|
|
|
return $c;
|
|
}
|
|
|
|
public function pageUpOrDown(string $c): void
|
|
{
|
|
if ($c === KeyType::PAGE_UP)
|
|
{
|
|
$this->cursorY = $this->rowOffset;
|
|
}
|
|
else if ($c === KeyType::PAGE_DOWN)
|
|
{
|
|
$this->cursorY = $this->rowOffset + $this->screenRows - 1;
|
|
if ($this->cursorY > $this->numRows)
|
|
{
|
|
$this->cursorY = $this->numRows;
|
|
}
|
|
}
|
|
|
|
$times = $this->screenRows;
|
|
for (; $times > 0; $times--)
|
|
{
|
|
$this->moveCursor($c === KeyType::PAGE_UP ? KeyType::ARROW_UP : KeyType::ARROW_DOWN);
|
|
}
|
|
}
|
|
|
|
protected function refreshSyntax(): void
|
|
{
|
|
// Update the syntax highlighting for all the rows of the file
|
|
array_walk($this->rows, fn (Row $row) => $row->updateSyntax());
|
|
}
|
|
|
|
private function refreshPHPSyntax(): void
|
|
{
|
|
if ($this->syntax->filetype !== 'PHP')
|
|
{
|
|
return;
|
|
}
|
|
|
|
$this->tokens = PHP::getTokens($this->rowsToString());
|
|
$this->refreshSyntax();
|
|
}
|
|
}
|