common, testing: Add Formatting of Error Messages

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Sources/Common/Error.swift

@@ -0,0 +1,126 @@
+// p4rse, Copyright 2026, Will Hawkins
+//
+// This file is part of p4rse.
+//
+// This file is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+public struct Error: Errorable, Equatable, CustomStringConvertible {
+  public func format() -> String {
+    return self.description
+  }
+
+  public func msg() -> String {
+    return self._msg
+  }
+
+  public func append(error: any Errorable) -> any Errorable {
+    return Errors(self, error)
+  }
+
+  let _msg: String
+
+  public init(withMessage msg: String) {
+    self._msg = msg
+  }
+
+  public var description: String {
+    return self._msg
+  }
+}
+
+public struct ErrorWithLocation: Errorable, Equatable, CustomStringConvertible {
+  let startFormat: String = "\u{1B}[31;1;4m"
+  let endFormat: String = "\u{1B}[0m"
+
+  public func format() -> String {
+    return startFormat + "\(self.location)" + endFormat + ": \(self._msg)"
+  }
+
+  public func msg() -> String {
+    return self.description
+  }
+
+  public func append(error: any Errorable) -> any Errorable {
+    return Errors(self, error)
+  }
+
+  let _msg: String
+
+  let location: SourceLocation
+
+  public init(sourceLocation location: SourceLocation, withError msg: String) {
+    self._msg = msg
+    self.location = location
+  }
+
+  public var description: String {
+    return "\(self.location): \(self._msg)"
+  }
+}
+
+public struct Errors: Errorable, CustomStringConvertible {
+  public func format() -> String {
+    return self.description
+  }
+
+  public func msg() -> String {
+    return self.description
+  }
+
+  public func append(error: any Errorable) -> any Errorable {
+    return Errors(self.errors + [error])
+  }
+
+  public var description: String {
+    return self.errors.map { error in
+      return error.msg()
+    }.joined(separator: ";")
+  }
+
+  public let errors: [any Errorable]
+
+  init(_ errors: [any Errorable]) {
+    self.errors = errors
+  }
+
+  public init(_ e1: any Errorable, _ e2: any Errorable) {
+    self.errors = [e1, e2]
+  }
+}
+
+public struct ErrorWithLabel: Errorable {
+  let label: String
+  let error: any Errorable
+
+  public init(_ label: String, _ error: any Errorable) {
+    self.label = label
+    self.error = error
+  }
+
+  public func format() -> String {
+    return self.description
+  }
+
+  public func msg() -> String {
+    return self.description
+  }
+
+  public func append(error: any Errorable) -> any Errorable {
+    return Errors(self, error)
+  }
+
+  public var description: String {
+    return "\(self.label): \(self.error.msg())"
+  }
+}

Sources/Common/Result.swift

@@ -15,113 +15,6 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-public struct Error: Errorable, Equatable, CustomStringConvertible {
-  public func format() -> String {
-    return self.description
-  }
-
-  public func msg() -> String {
-    return self._msg
-  }
-
-  public func append(error: any Errorable) -> any Errorable {
-    return Errors(self, error)
-  }
-
-  let _msg: String
-
-  public init(withMessage msg: String) {
-    self._msg = msg
-  }
-
-  public var description: String {
-    return self._msg
-  }
-}
-
-public struct ErrorWithLocation: Errorable, Equatable, CustomStringConvertible {
-
-  public func format() -> String {
-    return self.description
-  }
-
-  public func msg() -> String {
-    return self.description
-  }
-
-  public func append(error: any Errorable) -> any Errorable {
-    return Errors(self, error)
-  }
-
-  let _msg: String
-
-  let location: SourceLocation
-
-  public init(sourceLocation location: SourceLocation, withError msg: String) {
-    self._msg = msg
-    self.location = location
-  }
-
-  public var description: String {
-    return "\(self.location): \(self._msg)"
-  }
-}
-
-public struct Errors: Errorable, CustomStringConvertible {
-  public func format() -> String {
-    return self.description
-  }
-
-  public func msg() -> String {
-    return self.description
-  }
-
-  public func append(error: any Errorable) -> any Errorable {
-    return Errors(self.errors + [error])
-  }
-
-  public var description: String {
-    return self.errors.map { error in
-      return error.msg()
-    }.joined(separator: ";")
-  }
-
-  public let errors: [any Errorable]
-
-  init(_ errors: [any Errorable]) {
-    self.errors = errors
-  }
-
-  public init(_ e1: any Errorable, _ e2: any Errorable) {
-    self.errors = [e1, e2]
-  }
-}
-
-public struct ErrorWithLabel: Errorable {
-  let label: String
-  let error: any Errorable
-
-  public init(_ label: String, _ error: any Errorable) {
-    self.label = label
-    self.error = error
-  }
-
-  public func format() -> String {
-    return self.description
-  }
-
-  public func msg() -> String {
-    return self.description
-  }
-
-  public func append(error: any Errorable) -> any Errorable {
-    return Errors(self, error)
-  }
-
-  public var description: String {
-    return "\(self.label): \(self.error.msg())"
-  }
-}
 
 public enum Result<OKT>: Equatable {
   case Ok(OKT)

Tests/p4rseTests/ErrorTests/Formatting.swift

@@ -0,0 +1,34 @@
+// p4rse, Copyright 2026, Will Hawkins
+//
+// This file is part of p4rse.
+//
+// This file is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import Common
+import Foundation
+import Macros
+import P4Runtime
+import P4Lang
+import SwiftTreeSitter
+import Testing
+import TreeSitter
+import TreeSitterP4
+
+@testable import P4Compiler
+
+@Test func test_error_with_location_formatting() async throws {
+    let e = ErrorWithLocation(sourceLocation: SourceLocation(1, 5), withError: "There was an error")
+
+    print(e.format())
+}