Page rendering using ANSI support

app/Classes/Font.php

@@ -11,6 +11,127 @@ class Font
 
 	protected const MSG_WIDTH = 79;
 
+	private string $text = '';
+	private int $width = 0;
+	private int $height = 0;
+
+	public function __get($key)
+	{
+		switch ($key) {
+			case 'height':
+				return $this->height;
+
+			case 'width':
+				return $this->width;
+
+			default:
+				throw new \Exception(sprintf('Unknown key %s',$key));
+		}
+	}
+
+	/**
+	 * Message text, goes after header, and if a logo, to the right of it
+	 *
+	 * @param string $text
+	 */
+	public function addText(string $text)
+	{
+		$this->text = $text;
+		$this->dimensions();
+	}
+
+	/**
+	 * Characters used in the font
+	 *
+	 * @return Collection
+	 */
+	private function chars(): Collection
+	{
+		static $chars = NULL;
+
+		if (is_null($chars) && $this->text) {
+			// Trim any leading/trailing spaces
+			$text = trim(strtolower($this->text));
+			$chars = collect();
+
+			// Work out the characters we need
+			foreach (array_unique(str_split($text)) as $c) {
+				if (! $x=Arr::get(static::FONT,$c))
+					continue;
+
+				$chars->put($c,$x);
+			}
+		}
+
+		return $chars ?: collect();
+	}
+
+	/**
+	 * Full width of the rendered text
+	 *
+	 * @return void
+	 */
+	private function dimensions(): void
+	{
+		$chars = $this->chars();
+		$escape = FALSE;
+
+		foreach (str_split(strtolower($this->text)) as $c) {
+			if ($c == "\x1b") {
+				$escape = TRUE;
+				continue;
+
+			} elseif ($escape) {
+				$escape = FALSE;
+				continue;
+			}
+
+			$this->width += ($x=Arr::get($chars->get($c),0)) ? count($x) : 1;
+
+			if ($x)
+				$this->height = (($y=count($chars->get($c))) > $this->height) ? $y : $this->height;
+		}
+
+		// If the last character is a space, we'll reduce the width
+		$space = TRUE;
+		foreach ($chars->get($c) as $line => $x)
+			if (array_pop($x) != 32) {
+				$space = FALSE;
+				break;
+			}
+
+		if ($space)
+			$this->width--;
+	}
+
+	public function render_line(int $line): string
+	{
+		$chars = $this->chars();
+		$result = '';
+		$escape = FALSE;
+		$ansi = FALSE;
+
+		foreach (str_split(strtolower($this->text)) as $c) {
+			if (ord($c) == 0x1b) {
+				$escape = TRUE;
+
+			} elseif ($escape && $c) {
+				$result .= ANSI::ansi_color(ord($c));
+				$escape = FALSE;
+				$ansi = TRUE;
+
+			} elseif (($c == ' ') || (! $font_chars=$chars->get($c))) {
+				$result .= $c;
+
+			} else {
+				foreach (Arr::get($font_chars,$line) as $char)
+					$result .= chr($char);
+			}
+		}
+
+		return $result.($ansi ? ANSI::ansi_color(0x0e) : '');
+	}
+
 	/**
 	 * This function will format text to static::MSG_WIDTH, as well as adding the logo.
 	 * It is up to the text to be spaced appropriately to wrap around the icon.
@@ -146,9 +267,9 @@ class Font
 			for ($line=0;$line<$font_height;$line++) {
 				if ($line == 0) {
 					$line_icon_width = $icon_width
-							->skip(intdiv($result_height,$step)*$step)
-							->take($step)
-							->max();
+						->skip(intdiv($result_height,$step)*$step)
+						->take($step)
+						->max();
 
 					if ($line_icon_width)
 						$line_icon_width += ANSI::LOGO_OFFSET_WIDTH+ANSI::LOGO_BUFFER_WIDTH;