Made the font background of ones orange.

file.py

@@ -1,8 +1,9 @@
 #!/usr/bin/python3
 
 from PyQt6.QtWidgets import QWidget, QFileDialog, QVBoxLayout
-from PyQt6.QtGui import QFont
+from PyQt6.QtGui import QFont, QTextCharFormat, QColor
 from binary_text_edit import BinaryTextEdit
+from highlighting import Higlighter
 
 
 class FileActions:
@@ -89,6 +90,12 @@ class File:
         self.content_binary_input.setFont(QFont("Ubuntu Mono", 12))
         self.content_binary_input.textChanged.connect(self.on_edit)
 
+        self.bit_highlighter = Higlighter()
+        self.one_format = QTextCharFormat()
+        self.one_format.setBackground(QColor(200, 150, 100))
+        self.bit_highlighter.add_mapping("1", self.one_format)
+        self.bit_highlighter.setDocument(self.content_binary_input.document())
+
         self.content_widget.setLayout(self.content_widget_layout)
 
         self.app.main_window.openFileTabs.addTab(  # add a tab for the file in the top files list

highlighting.py

@@ -0,0 +1,20 @@
+#!/usr/bin/python3
+
+import re
+from PyQt6.QtGui import QSyntaxHighlighter
+
+
+class Higlighter(QSyntaxHighlighter):
+    def __init__(self, parent=None):
+        QSyntaxHighlighter.__init__(self, parent)
+
+        self.mappings = {}
+
+    def add_mapping(self, pattern, format):
+        self.mappings[pattern] = format
+
+    def highlightBlock(self, text):
+        for pattern, format in self.mappings.items():
+            for match in re.finditer(pattern, text):
+                start, end = match.span()
+                self.setFormat(start, end - start, format)