extend Cordial syntax highlighting with types, booleans, functions, and missing keywords

src/EditorView.swift

@@ -1032,10 +1032,17 @@ func updateBlockRanges(for textView: NSTextView) {
 // MARK: - Syntax Highlighting
 
 private let syntaxKeywords: Set<String> = [
-    "let", "fn", "if", "else", "for", "map", "cast", "plot", "sch"
+    "let", "fn", "if", "else", "for", "while", "return", "mut", "in",
+    "map", "cast", "plot", "sch"
 ]
 
-private let syntaxOperatorChars = CharacterSet(charactersIn: "+-*/=^<>!(){}[]:,")
+private let syntaxTypes: Set<String> = [
+    "bool", "int", "float", "str", "i32", "f64", "Vec", "String"
+]
+
+private let syntaxBooleans: Set<String> = ["true", "false"]
+
+private let syntaxOperatorChars = CharacterSet(charactersIn: "+-*/=^<>!(){}[]:,.&|%")
 
 func applySyntaxHighlighting(to textStorage: NSTextStorage) {
     let text = textStorage.string
@@ -1279,6 +1286,8 @@ private func highlightCodeTokens(_ line: NSString, inRange range: NSRange, lineO
     let identStart = CharacterSet.letters.union(CharacterSet(charactersIn: "_"))
     let identChars = identStart.union(.decimalDigits)
 
+    var prevIdent: String? = nil
+
     while !scanner.isAtEnd {
         let pos = scanner.currentIndex
 
@@ -1300,6 +1309,7 @@ private func highlightCodeTokens(_ line: NSString, inRange range: NSRange, lineO
             }
             let absRange = NSRange(location: lineOffset + range.location + startIdx, length: strContent.count)
             textStorage.addAttribute(.foregroundColor, value: syn.string, range: absRange)
+            prevIdent = nil
             continue
         }
 
@@ -1308,6 +1318,7 @@ private func highlightCodeTokens(_ line: NSString, inRange range: NSRange, lineO
             let startIdx = sub.distance(from: sub.startIndex, to: pos)
             let absRange = NSRange(location: lineOffset + range.location + startIdx, length: numStr.count)
             textStorage.addAttribute(.foregroundColor, value: syn.number, range: absRange)
+            prevIdent = nil
             continue
         }
 
@@ -1318,8 +1329,22 @@ private func highlightCodeTokens(_ line: NSString, inRange range: NSRange, lineO
                 let absRange = NSRange(location: lineOffset + range.location + startIdx, length: ident.count)
                 if syntaxKeywords.contains(ident) {
                     textStorage.addAttribute(.foregroundColor, value: syn.keyword, range: absRange)
+                } else if syntaxBooleans.contains(ident) {
+                    textStorage.addAttribute(.foregroundColor, value: syn.boolean, range: absRange)
+                } else if syntaxTypes.contains(ident) {
+                    textStorage.addAttribute(.foregroundColor, value: syn.type, range: absRange)
+                } else if prevIdent == "fn" {
+                    textStorage.addAttribute(.foregroundColor, value: syn.function, range: absRange)
+                } else {
+                    // Check if followed by '(' -> function call
+                    let remaining = sub[scanner.currentIndex...]
+                    let trimmedRest = remaining.drop(while: { $0 == " " })
+                    if trimmedRest.first == "(" {
+                        textStorage.addAttribute(.foregroundColor, value: syn.function, range: absRange)
+                    }
                 }
             }
+            prevIdent = ident
             continue
         }
 
@@ -1328,10 +1353,13 @@ private func highlightCodeTokens(_ line: NSString, inRange range: NSRange, lineO
             let startIdx = sub.distance(from: sub.startIndex, to: pos)
             let absRange = NSRange(location: lineOffset + range.location + startIdx, length: op.count)
             textStorage.addAttribute(.foregroundColor, value: syn.operator, range: absRange)
+            prevIdent = nil
             continue
         }
 
-        // Skip unrecognized character
+        // Skip unrecognized character (preserve prevIdent across whitespace)
+        let ch = sub[scanner.currentIndex]
+        if !ch.isWhitespace { prevIdent = nil }
         scanner.currentIndex = sub.index(after: scanner.currentIndex)
     }
 }

src/Theme.swift

@@ -122,6 +122,8 @@ struct Theme {
         let `operator`: NSColor
         let function: NSColor
         let result: NSColor
+        let type: NSColor
+        let boolean: NSColor
     }
 
     static var syntax: SyntaxColors {
@@ -133,7 +135,9 @@ struct Theme {
             comment:  p.overlay1,
             operator: p.sky,
             function: p.blue,
-            result:   p.teal
+            result:   p.teal,
+            type:     p.yellow,
+            boolean:  p.peach
         )
     }
 }