Start splitting render methods

src/Document.php

@@ -40,12 +40,17 @@ class Document {
 		return new self();
 	}
 
-	public function row(int $index): ?Row
+	public function row(int $index): Row
 	{
-		return (array_key_exists($index, $this->rows)) ? $this->rows[$index] : null;
+		return (array_key_exists($index, $this->rows))
+			? $this->rows[$index]
+			: Row::default();
 	}
 
-
+	public function isEmpty(): bool
+	{
+		return empty($this->rows);
+	}
 
 	// ------------------------------------------------------------------------
 	// ! File I/O

src/Editor.php

@@ -3,7 +3,13 @@
 namespace Aviat\Kilo;
 
 use Aviat\Kilo\Type\TerminalSize;
-use Aviat\Kilo\Enum\{Color, KeyCode, KeyType, Highlight};
+use Aviat\Kilo\Enum\{
+	Color,
+	KeyCode,
+	KeyType,
+	Highlight,
+	SearchDirection
+};
 use Aviat\Kilo\Type\{Point, StatusMessage};
 
 /**
@@ -127,6 +133,20 @@ class Editor {
 		}
 	}
 
+	/**
+	 * Set a status message to be displayed, using printf formatting
+	 * @param string $fmt
+	 * @param mixed ...$args
+	 */
+	public function setStatusMessage(string $fmt, mixed ...$args): void
+	{
+		$text = func_num_args() > 1
+			? sprintf($fmt, ...$args)
+			: $fmt;
+
+		$this->statusMessage = StatusMessage::from($text);
+	}
+
 	// ------------------------------------------------------------------------
 	// ! Row Operations
 	// ------------------------------------------------------------------------
@@ -180,17 +200,6 @@ class Editor {
 		return $cx;
 	}
 
-
-	// ------------------------------------------------------------------------
-	// ! Editor Operations
-	// ------------------------------------------------------------------------
-
-	protected function insertChar(string $c): void
-	{
-		$this->document->insert($this->cursor, $c);
-		$this->moveCursor(KeyType::ARROW_RIGHT);
-	}
-
 	// ------------------------------------------------------------------------
 	// ! File I/O
 	// ------------------------------------------------------------------------
@@ -226,8 +235,8 @@ class Editor {
 
 	protected function findCallback(string $query, string $key): void
 	{
-		static $lastMatch = -1;
-		static $direction = 1;
+		static $lastMatch = NO_MATCH;
+		static $direction = SearchDirection::FORWARD;
 
 		static $savedHlLine = 0;
 		static $savedHl = [];
@@ -236,7 +245,7 @@ class Editor {
 		{
 			$row = $this->document->row($savedHlLine);
 
-			if ($row !== null)
+			if ($row->isValid())
 			{
 				$row->hl = $savedHl;
 			}
@@ -244,35 +253,31 @@ class Editor {
 			$savedHl = [];
 		}
 
-		switch ($key)
+		$direction = match ($key) {
+			KeyType::ARROW_UP, KeyType::ARROW_LEFT => SearchDirection::BACKWARD,
+			default => SearchDirection::FORWARD
+		};
+
+		$arrowKeys = [KeyType::ARROW_UP, KeyType::ARROW_DOWN, KeyType::ARROW_LEFT, KeyType::ARROW_RIGHT];
+
+		// Reset search state with non arrow-key input
+		if ( ! in_array($key, $arrowKeys, true))
 		{
-			case KeyCode::ENTER:
-			case KeyCode::ESCAPE:
-				$lastMatch = -1;
-				$direction = 1;
+			$lastMatch = NO_MATCH;
+			$direction = SearchDirection::FORWARD;
+
+			if ($key === KeyCode::ENTER || $key === KeyCode::ESCAPE)
+			{
 				return;
-
-			case KeyType::ARROW_DOWN:
-			case KeyType::ARROW_RIGHT:
-				$direction = 1;
-			break;
-
-			case KeyType::ARROW_UP:
-			case KeyType::ARROW_LEFT:
-				$direction = -1;
-			break;
-
-			default:
-				$lastMatch = -1;
-				$direction = 1;
+			}
 		}
 
-		if ($lastMatch === -1)
+		if ($lastMatch === NO_MATCH)
 		{
-			$direction = 1;
+			$direction = SearchDirection::FORWARD;
 		}
 
-		$current = $lastMatch;
+		$current = (int)$lastMatch;
 
 		if (empty($query))
 		{
@@ -292,7 +297,7 @@ class Editor {
 			}
 
 			$row = $this->document->row($current);
-			if ($row === null)
+			if ( ! $row->isValid())
 			{
 				break;
 			}
@@ -342,7 +347,7 @@ class Editor {
 		{
 			$row = $this->document->row($this->cursor->y);
 
-			if ($row !== null)
+			if ($row->isValid())
 			{
 				$this->renderX = $this->rowCxToRx($row, $this->cursor->x);
 			}
@@ -389,7 +394,7 @@ class Editor {
 	protected function drawRow(int $rowIdx): void
 	{
 		$row = $this->document->row($rowIdx);
-		if ($row === null)
+		if ( ! $row->isValid())
 		{
 			return;
 		}
@@ -556,15 +561,6 @@ class Editor {
 		Terminal::write($this->outputBuffer, strlen($this->outputBuffer));
 	}
 
-	public function setStatusMessage(string $fmt, mixed ...$args): void
-	{
-		$text = func_num_args() > 1
-			? sprintf($fmt, ...$args)
-			: $fmt;
-
-		$this->statusMessage = StatusMessage::from($text);
-	}
-
 	// ------------------------------------------------------------------------
 	// ! Input
 	// ------------------------------------------------------------------------
@@ -607,99 +603,9 @@ class Editor {
 		}
 	}
 
-	protected function moveCursor(string $key): void
-	{
-		$x = $this->cursor->x;
-		$y = $this->cursor->y;
-		$row = $this->document->row($y);
-		if ($row === NULL)
-		{
-			return;
-		}
-
-		switch ($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:
-				$y = ($y > $this->terminalSize->rows)
-					? $y - $this->terminalSize->rows
-					: 0;
-			break;
-
-			case KeyType::PAGE_DOWN:
-				$y = ($y + $this->terminalSize->rows < $this->document->numRows)
-					? $y + $this->terminalSize->rows
-					: $this->document->numRows;
-			break;
-
-			case KeyType::HOME_KEY:
-				$x = 0;
-			break;
-
-			case KeyType::END_KEY:
-				if ($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 ($row !== null)
-		{
-			if ($x > $row->size)
-			{
-				$x = $row->size;
-			}
-
-			$this->cursor->x = $x;
-			$this->cursor->y = $y;
-		}
-	}
-
+	/**
+	 * Input processing
+	 */
 	protected function processKeypress(): void
 	{
 		$c = Terminal::readKey();
@@ -768,6 +674,109 @@ class Editor {
 		}
 	}
 
+	// ------------------------------------------------------------------------
+	// ! 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:
+				$y = ($y > $this->terminalSize->rows)
+					? $y - $this->terminalSize->rows
+					: 0;
+				break;
+
+			case KeyType::PAGE_DOWN:
+				$y = ($y + $this->terminalSize->rows < $this->document->numRows)
+					? $y + $this->terminalSize->rows
+					: $this->document->numRows;
+				break;
+
+			case KeyType::HOME_KEY:
+				$x = 0;
+				break;
+
+			case KeyType::END_KEY:
+				if ($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);
+		$this->moveCursor(KeyType::ARROW_RIGHT);
+	}
+
 	protected function quitAttempt(): void
 	{
 		if ($this->document->isDirty() && $this->quitTimes > 0)

src/Enum/SearchDirection.php

@@ -0,0 +1,15 @@
+<?php declare(strict_types=1);
+
+namespace Aviat\Kilo\Enum;
+
+use Aviat\Kilo\Traits;
+
+/**
+ * @enum
+ */
+class SearchDirection {
+	use Traits\ConstList;
+
+	public const FORWARD = 1;
+	public const BACKWARD = -1;
+}

src/Row.php

@@ -8,38 +8,60 @@ use Aviat\Kilo\Enum\KeyCode;
 /**
  * @property-read int $size
  * @property-read int $rsize
- * @property-read string $chars
+ * @property string $chars
  */
 class Row {
 	use Traits\MagicProperties;
 
-	private string $chars = '';
+	/**
+	 * The version of the row to be displayed (where tabs are converted to display spaces)
+	 */
 	public string $render = '';
 
+	/**
+	 * The mapping of characters to their highlighting type
+	 */
 	public array $hl = [];
 
-	public int $idx;
-
-	// This feels dirty...
-	private Document $parent;
 	private bool $hlOpenComment = FALSE;
 
 	private const T_RAW = -1;
 
 	public static function new(Document $parent, string $chars, int $idx): self
 	{
-		$self = new self();
-		$self->chars = $chars;
-		$self->parent = $parent;
-		$self->idx = $idx;
-
-		return $self;
+		return new self(
+			$parent,
+			$chars,
+			$idx,
+		);
 	}
 
-	private function __construct() {
-		// Private in favor of ::new static function
+	public static function default(): self
+	{
+		return new self(
+			Document::new(),
+			'',
+			0,
+		);
 	}
 
+	private function __construct(
+		/**
+		 * The document that this row belongs to
+		 */
+		private Document $parent,
+
+		/**
+		 * @var string The raw characters in the row
+		 */
+		private string $chars,
+
+		/**
+		 * @var int The line number of the current row
+		 */
+		public int $idx,
+	) {}
+
 	public function __get(string $name): mixed
 	{
 		return match ($name)
@@ -77,6 +99,16 @@ class Row {
 		];
 	}
 
+	/**
+	 * Is this row a valid part of a document?
+	 *
+	 * @return bool
+	 */
+	public function isValid(): bool
+	{
+		return ! $this->parent->isEmpty();
+	}
+
 	public function insert(int $at, string $c): void
 	{
 		if ($at < 0 || $at > $this->size)
@@ -123,6 +155,60 @@ class Row {
 		$this->highlightGeneral();
 	}
 
+	protected function highlightComment(int $i, string $char): bool
+	{
+		$scs = $this->parent->fileType->syntax->singleLineCommentStart;
+		$scsLen = strlen($scs);
+
+		if ($scsLen > 0 && substr($this->render, $i, $scsLen) === $scs)
+		{
+			array_replace_range($this->hl, $i, $this->rsize - $i, Highlight::COMMENT);
+			return true;
+		}
+
+		return false;
+	}
+
+	protected function highlightString(int &$i): bool
+	{
+		$char = $this->render[$i];
+		$enabled = $this->parent->fileType->syntax->flags & Syntax::HIGHLIGHT_STRINGS;
+
+		if ($enabled && $char === '"' || $char === '\'')
+		{
+			$quote = $char;
+			$this->hl[$i] = Highlight::STRING;
+			$i++;
+
+			while ($i < $this->rsize)
+			{
+				$char = $this->render[$i];
+				$this->hl[$i] = Highlight::STRING;
+
+				// Check for escaped character
+				if ($char === '\\' && $i+1 < $this->rsize)
+				{
+					$this->hl[$i + 1] = Highlight::STRING;
+					$i += 2;
+					continue;
+				}
+
+				// End of the string!
+				if ($char === $quote)
+				{
+					$i++;
+					break;
+				}
+
+				$i++;
+			}
+
+			return true;
+		}
+
+		return false;
+	}
+
 	protected function highlightGeneral(): void
 	{
 		$this->hl = array_fill(0, $this->rsize, Highlight::NORMAL);
@@ -192,37 +278,7 @@ class Row {
 			}
 
 			// String/Char literals
-			if ($this->parent->fileType->syntax->flags & Syntax::HIGHLIGHT_STRINGS)
-			{
-				if ($inString !== '')
-				{
-					$this->hl[$i] = Highlight::STRING;
-
-					// Check for escaped character
-					if ($char === '\\' && $i+1 < $this->rsize)
-					{
-						$this->hl[$i + 1] = Highlight::STRING;
-						$i += 2;
-						continue;
-					}
-
-					if ($char === $inString)
-					{
-						$inString = '';
-					}
-					$i++;
-					$prevSep = 1;
-					continue;
-				}
-
-				if ( $char === '"' || $char === '\'')
-				{
-					$inString = $char;
-					$this->hl[$i] = Highlight::STRING;
-					$i++;
-					continue;
-				}
-			}
+			$this->highlightString($i);
 
 			// Numbers, including decimal points
 			if ($this->parent->fileType->syntax->flags & Syntax::HIGHLIGHT_NUMBERS)

src/constants.php

@@ -8,3 +8,5 @@ namespace Aviat\Kilo;
 const KILO_VERSION = '0.3.0';
 const KILO_TAB_STOP = 4;
 const KILO_QUIT_TIMES = 3;
+
+const NO_MATCH = -1;