Add Font::toString()

@@ -60,9 +60,7 @@ class Font {
 
   final Type1Fonts font;
 
-  @protected
-  PdfFont buildFont(PdfDocument pdfDocument) {
-    const Map<Type1Fonts, String> type1Map = <Type1Fonts, String>{
+  static const Map<Type1Fonts, String> _type1Map = <Type1Fonts, String>{
     Type1Fonts.courier: 'Courier',
     Type1Fonts.courierBold: 'Courier-Bold',
     Type1Fonts.courierBoldOblique: 'Courier-BoldOblique',
@@ -79,7 +77,10 @@ class Font {
     Type1Fonts.zapfDingbats: 'ZapfDingbats'
   };
 
-    final String fontName = type1Map[font];
+  String get fontName => _type1Map[font];
+
+  @protected
+  PdfFont buildFont(PdfDocument pdfDocument) {
     final PdfFont existing = pdfDocument.fonts.firstWhere(
       (PdfFont font) => font.subtype == '/Type1' && font.fontName == fontName,
       orElse: () => null,
@@ -132,14 +133,24 @@ class Font {
 
     return _pdfFont;
   }
+
+  @override
+  String toString() => '<Type1 Font "$fontName">';
 }
 
 class TtfFont extends Font {
   TtfFont(this.data);
 
   final ByteData data;
+
   @override
   PdfFont buildFont(PdfDocument pdfDocument) {
     return PdfTtfFont(pdfDocument, data);
   }
+
+  @override
+  String toString() {
+    final TtfParser font = TtfParser(data);
+    return '<TrueType Font "${font.fontName}">';
+  }
 }