1 files changed, 72 insertions, 3 deletions

diff --git a/Map/Presentation/Base Components/MapTextEditor.swift b/Map/Presentation/Base Components/MapTextEditor.swift
index 31da790..a7dbe52 100644
--- a/Map/Presentation/Base Components/MapTextEditor.swift
+++ b/Map/Presentation/Base Components/MapTextEditor.swift
@@ -20,6 +20,19 @@ import SwiftUI
 class MapTextEditorController: NSViewController {
 
   @Binding var document: MapDocument
+  var highlightRanges: [Range<String.Index>] {
+    didSet {
+      updateHighlights()
+    }
+  }
+
+  var selectedRange: Int {
+    didSet {
+      updateHighlights()
+      focusOnResult()
+    }
+  }
+
   let onChange: () -> Void
 
   private let vertexRegex = MapParsingPatterns.vertex
@@ -32,9 +45,14 @@ class MapTextEditorController: NSViewController {
 
   private let changeDebouncer: Debouncer = Debouncer(seconds: 1)
 
-  init(document: Binding<MapDocument>, onChange: @escaping () -> Void) {
+  init(
+    document: Binding<MapDocument>, highlightRanges: [Range<String.Index>], selectedRange: Int,
+    onChange: @escaping () -> Void
+  ) {
     self._document = document
     self.onChange = onChange
+    self.highlightRanges = highlightRanges
+    self.selectedRange = selectedRange
     super.init(nibName: nil, bundle: nil)
   }
 
@@ -60,6 +78,50 @@ class MapTextEditorController: NSViewController {
 
   override func viewDidAppear() {
     self.view.window?.makeFirstResponder(self.view)
+    updateHighlights()
+  }
+
+  private var textView: NSTextView? {
+    return (view as? NSScrollView)?.documentView as? NSTextView
+  }
+
+  private func updateHighlights() {
+    if let textView {
+      if let textStorage = textView.textStorage {
+        textStorage.removeAttribute(
+          .backgroundColor, range: NSRange(location: 0, length: textStorage.length))
+
+        for range in highlightRanges {
+          let nsRange = NSRange(range, in: textStorage.string)
+
+          textStorage.addAttribute(.backgroundColor, value: NSColor.syntax.match, range: nsRange)
+        }
+
+        textView.needsDisplay = true
+
+      }
+    }
+  }
+
+  private func focusOnResult() {
+    if let textView {
+      if let textStorage = textView.textStorage {
+        if selectedRange < highlightRanges.count {
+          let range = highlightRanges[selectedRange]
+          let nsRange = NSRange(range, in: textStorage.string)
+          textView.scrollRangeToVisible(nsRange)
+          textView.selectedRange = nsRange
+        }
+      }
+    }
+  }
+
+  private func setSelectionColor() {
+    guard let textView = self.textView else { return }
+
+    var selectedTextAttributes = textView.selectedTextAttributes
+    selectedTextAttributes[.backgroundColor] = NSColor.yellow.withAlphaComponent(0.3)
+    textView.selectedTextAttributes = selectedTextAttributes
   }
 }
 
@@ -182,16 +244,23 @@ extension MapTextEditorController: NSTextStorageDelegate {
 struct MapTextEditor: NSViewControllerRepresentable {
 
   @Binding var document: MapDocument
+  var highlightRanges: [Range<String.Index>]
+  var selectedRange: Int
   var onChange: () -> Void = {}
 
   func makeNSViewController(
     context: NSViewControllerRepresentableContext<MapTextEditor>
   ) -> MapTextEditorController {
-    return MapTextEditorController(document: $document, onChange: onChange)
+    return MapTextEditorController(
+      document: $document, highlightRanges: highlightRanges, selectedRange: selectedRange,
+      onChange: onChange)
   }
 
   func updateNSViewController(
     _ nsViewController: MapTextEditorController,
     context: NSViewControllerRepresentableContext<MapTextEditor>
-  ) {}
+  ) {
+    nsViewController.highlightRanges = highlightRanges
+    nsViewController.selectedRange = selectedRange
+  }
 }