Refactor syntax highlighting, complete step 149

src/Editor.php

@@ -49,6 +49,23 @@ class Key {
 	}
 }
 
+class Highlight {
+	public const NORMAL = 0;
+	public const NUMBER = 1;
+}
+
+function syntaxToColor(int $hl): int
+{
+	switch ($hl)
+	{
+		case Highlight::NUMBER:
+			return 31; // Foreground Red
+
+		default:
+			return 37; // Foreground White
+	}
+}
+
 /**
  * @property-read int size
  * @property-read int rsize
@@ -59,6 +76,8 @@ class Row {
 	public string $chars = '';
 	public string $render = '';
 
+	public array $hl = [];
+
 	public static function new(string $chars): self
 	{
 		return new self($chars);
@@ -108,6 +127,25 @@ class Row {
 				$this->render[$idx++] = $this->chars[$i];
 			}
 		}
+
+		$this->updateSyntax();
+	}
+
+	// ------------------------------------------------------------------------
+	// ! Syntax Highlighting
+	// ------------------------------------------------------------------------
+
+	protected function updateSyntax(): void
+	{
+		$this->hl = array_fill(0, $this->rsize, Highlight::NORMAL);
+
+		for ($i = 0; $i < $this->rsize; $i++)
+		{
+			if (isdigit($this->render[$i]))
+			{
+				$this->hl[$i] = Highlight::NUMBER;
+			}
+		}
 	}
 }
 
@@ -661,20 +699,34 @@ class Editor {
 				}
 
 				$c = substr($this->rows[$filerow]->render, $this->colOffset, $len);
+				$hl = array_slice($this->rows[$filerow]->hl, $this->colOffset, $len);
+
+				$currentColor = -1;
 
 				for ($i = 0; $i < $len; $i++)
 				{
-					if (isdigit($c[$i]))
+					if ($hl[$i] === Highlight::NORMAL)
+					{
+						if ($currentColor !== -1)
 						{
-						$this->ab .= "\x1b[31m";
-						$this->ab .= $c[$i];
 							$this->ab .= "\x1b[39m";
+							$currentColor = -1;
+						}
+						$this->ab .= $c[$i];
 					}
 					else
 					{
+						$color = syntaxToColor($hl[$i]);
+						if ($color !== $currentColor)
+						{
+							$currentColor = $color;
+							$this->ab .= sprintf("\x1b[%dm", $color);
+						}
 						$this->ab .= $c[$i];
 					}
 				}
+
+				$this->ab .= "\x1b[39m";
 			}
 
 			$this->ab .= "\x1b[K"; // Clear the current line