Add convenience initializer for raw string literals

Author: fwcd

Sources/SwiftSyntaxBuilder/StringLiteralExprConvenienceInitializers.swift

@@ -13,13 +13,33 @@
 import SwiftSyntax
 
 extension StringLiteralExpr {
-  public init(_ value: String, openQuote: TokenSyntax = .stringQuote, closeQuote: TokenSyntax = .stringQuote) {
+  /// Creates a string literal, optionally specifying quotes and delimiters.
+  public init(
+    openDelimiter: TokenSyntax? = nil,
+    openQuote: TokenSyntax = .stringQuote,
+    _ value: String,
+    closeQuote: TokenSyntax = .stringQuote,
+    closeDelimiter: TokenSyntax? = nil
+  ) {
     let content = TokenSyntax.stringSegment(value)
     let segment = StringSegment(content: content)
     let segments = StringLiteralSegments([segment])
 
-    self.init(openQuote: openQuote,
-              segments: segments,
-              closeQuote: closeQuote)
+    self.init(
+      openDelimiter: openDelimiter,
+      openQuote: openQuote,
+      segments: segments,
+      closeQuote: closeQuote,
+      closeDelimiter: closeDelimiter
+    )
+  }
+
+  /// Creates a raw string literal.
+  public init(raw value: String) {
+    self.init(
+      openDelimiter: .rawStringDelimiter("#"),
+      value,
+      closeDelimiter: .rawStringDelimiter("#")
+    )
   }
 }

Tests/SwiftSyntaxBuilderTest/StringLiteralTests.swift

@@ -33,6 +33,8 @@ final class StringLiteralTests: XCTestCase {
       #line: (StringLiteralExpr("asdf"), #"␣"asdf""#),
       #line: ("", #"␣"""#),
       #line: ("asdf", #"␣"asdf""#),
+      #line: (StringLiteralExpr(raw: "abc"), "␣#\"abc\"#"),
+      #line: (StringLiteralExpr(raw: #""quoted""#), "␣#\"\"quoted\"\"#"),
     ]
 
     for (line, testCase) in testCases {