Add Buildable gyb

Author: kimdv

Sources/SwiftSyntaxBuilder/SyntaxBuildables.swift.gyb

@@ -0,0 +1,93 @@
+%{
+  from gyb_syntax_support import *
+  from gyb_syntax_support.kinds import lowercase_first_word
+  # -*- mode: Swift -*-
+  # Ignore the following admonition it applies to the resulting .swift file only
+}%
+//// Automatically Generated From Tokens.swift.gyb.
+//// Do Not Edit Directly!
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2021 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 SwiftSyntax
+
+// MARK: - Protocols
+
+public protocol SyntaxListBuildable {
+  func buildSyntaxList(format: Format, leadingTrivia: Trivia) -> [Syntax]
+}
+
+public protocol SyntaxBuildable: SyntaxListBuildable {
+  func buildSyntax(format: Format, leadingTrivia: Trivia) -> Syntax
+}
+
+extension SyntaxBuildable {
+  public func buildSyntaxList(format: Format, leadingTrivia: Trivia) -> [Syntax] {
+    [buildSyntax(format: format, leadingTrivia: leadingTrivia)]
+  }
+}
+
+// MARK: - Function Builder
+
+@_functionBuilder
+public struct SyntaxListBuilder {
+  public static func buildBlock(_ builders: SyntaxListBuildable...) -> SyntaxListBuildable {
+    SyntaxList(builders: builders)
+  }
+}
+
+// MARK: - List
+
+public struct SyntaxList: SyntaxListBuildable {
+  let builders: [SyntaxListBuildable]
+
+  public func buildSyntaxList(format: Format, leadingTrivia: Trivia) -> [Syntax] {
+    builders.flatMap {
+      $0.buildSyntaxList(format: format, leadingTrivia: leadingTrivia)
+    }
+  }
+}
+
+extension SyntaxList {
+  public static let empty = SyntaxList(builders: [])
+}
+
+// MARK: - Buildables
+
+// MARK: Source File
+
+public struct SourceFile: SyntaxBuildable {
+  let builder: SyntaxListBuildable
+
+  public init(@SyntaxListBuilder makeBuilder: () -> SyntaxListBuildable) {
+    self.builder = makeBuilder()
+  }
+
+  public func buildSyntax(format: Format, leadingTrivia: Trivia) -> Syntax {
+    let syntaxList = builder.buildSyntaxList(format: format, leadingTrivia: leadingTrivia)
+
+    let sourceFile = SourceFileSyntax {
+      for (index, syntax) in syntaxList.enumerated() {
+        let trivia: Trivia =
+          index == syntaxList.startIndex
+            ? format._makeIndent()
+            : .newlines(1) + format._makeIndent()
+
+        $0.addStatement(CodeBlockItemSyntax {
+          $0.useItem(syntax)
+        }.withLeadingTrivia(trivia))
+      }
+    }.withLeadingTrivia(leadingTrivia)
+
+    return Syntax(sourceFile)
+  }
+}

Sources/SwiftSyntaxBuilder/SyntaxBuildables.swift renamed to Sources/SwiftSyntaxBuilder/gyb_generated/SyntaxBuildables.swift

@@ -1,8 +1,10 @@
+//// Automatically Generated From Tokens.swift.gyb.
+//// Do Not Edit Directly!
 //===----------------------------------------------------------------------===//
 //
 // This source file is part of the Swift.org open source project
 //
-// Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
+// Copyright (c) 2014 - 2021 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