Make Diagnostic CustomDebugStringConvertible

Author: ahoppen

Sources/Diagnostics/Diagnostic.swift

@@ -12,7 +12,7 @@
 
 import SwiftSyntax
 
-public struct Diagnostic {
+public struct Diagnostic: CustomDebugStringConvertible {
   /// The message that should be displayed to the user
   public let diagMessage: DiagnosticMessage
 
@@ -39,5 +39,15 @@ public struct Diagnostic {
   public func location(converter: SourceLocationConverter) -> SourceLocation {
     return node.startLocation(converter: converter)
   }
+
+  public var debugDescription: String {
+    if let root = node.root.as(SourceFileSyntax.self) {
+      let locationConverter = SourceLocationConverter(file: "", tree: root)
+      let location = location(converter: locationConverter)
+      return "\(location): \(message)"
+    } else {
+      return "<unknown>: \(message)"
+    }
+  }
 }
 

Sources/swift-parser-test/swift-parser-test.swift

@@ -132,14 +132,11 @@ class PrintDiags: ParsableCommand {
       enableBareSlashRegexLiteral: enableBareSlashRegex
     )
     let diags = ParseDiagnosticsGenerator.diagnostics(for: tree)
-    let locationConverter = SourceLocationConverter(file: sourceFile, tree: tree)
     if diags.isEmpty {
       print("No diagnostics produced")
     }
     for diag in diags {
-      let location = diag.location(converter: locationConverter)
-      let message = diag.message
-      print("\(location): \(message)")
+      print("\(diag.debugDescription)")
     }
   }
 }