Add SimpleStringLiteralExprSyntax.representedStringValue

Sources/SwiftParser/StringLiteralRepresentedLiteralValue.swift

@@ -16,6 +16,19 @@
 @_spi(RawSyntax) @_spi(BumpPtrAllocator) import SwiftSyntax
 #endif
 
+private func getStringLiteralKind(quoteToken: TokenSyntax) -> StringLiteralKind? {
+  switch quoteToken.tokenKind {
+  case .stringQuote:
+    return .singleLine
+  case .multilineStringQuote:
+    return .multiLine
+  case .singleQuote:
+    return .singleQuote
+  default:
+    return nil
+  }
+}
+
 extension StringLiteralExprSyntax {
 
   /// Returns the string value of the literal as the parsed program would see
@@ -55,16 +68,7 @@ extension StringLiteralExprSyntax {
 
   @_spi(Compiler)
   public var stringLiteralKind: StringLiteralKind? {
-    switch openingQuote.tokenKind {
-    case .stringQuote:
-      return .singleLine
-    case .multilineStringQuote:
-      return .multiLine
-    case .singleQuote:
-      return .singleQuote
-    default:
-      return nil
-    }
+    getStringLiteralKind(quoteToken: openingQuote)
   }
 
   @_spi(Compiler)
@@ -73,6 +77,23 @@ extension StringLiteralExprSyntax {
   }
 }
 
+extension SimpleStringLiteralExprSyntax {
+  public var representedLiteralValue: String? {
+    guard let stringLiteralKind else { return nil }
+
+    var results = ""
+    for segment in segments {
+      segment.appendUnescapedLiteralValue(stringLiteralKind: stringLiteralKind, delimiterLength: 0, to: &results)
+    }
+    return results
+  }
+
+  @_spi(Compiler)
+  public var stringLiteralKind: StringLiteralKind? {
+    getStringLiteralKind(quoteToken: openingQuote)
+  }
+}
+
 extension StringSegmentSyntax {
   @_spi(Compiler)
   public func appendUnescapedLiteralValue(

Tests/SwiftParserTest/SimpleStringLiteralRepresentedLiteralValueTests.swift

@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import SwiftParser
+import SwiftSyntax
+import SwiftSyntaxBuilder
+import XCTest
+
+class SimpleStringLiteralRepresentedLiteralValueTests: ParserTestCase {
+  func testBasic() {
+    test(###"""
+    #sourceLocation(file: "foo.swift", line: 0)
+    """###, "foo.swift")
+  }
+
+  func testBasicUnicode() {
+    test(###"""
+    #sourceLocation(file: "foo\u{002E}swift", line: 0)
+    """###, "foo.swift")
+  }
+
+  func testMultiline() {
+    test(###"""
+    #sourceLocation(file: """
+      foo.swift
+      """, line: 0)
+    """###, "foo.swift")
+  }
+
+  func testMultilineEscaped() {
+    test(###"""
+    #sourceLocation(file: """
+      foo.\
+      swift
+      """, line: 0)
+    """###, "foo.swift")
+  }
+
+  func test(_ source: String, _ expectedValue: String, file: StaticString = #filePath, line: UInt = #line) {
+    let parsed = Parser.parse(source: source)
+    guard let literalExpr: SimpleStringLiteralExprSyntax = parsed.statements.first?.item.as(PoundSourceLocationSyntax.self)?.arguments?.fileName else {
+      return XCTFail("target literal expression not found", file: file, line: line)
+    }
+    XCTAssertEqual(literalExpr.representedLiteralValue, expectedValue, file: file, line: line)
+  }
+}