Add convenience initializer for BinaryOperatorExpr

Sources/SwiftSyntaxBuilder/BinaryOperatorExprConvenienceInitializers.swift

@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+extension BinaryOperatorExpr {
+  public init(_ text: String) {
+    self.init(operatorToken: TokenSyntax.spacedBinaryOperator(text))
+  }
+}

Sources/SwiftSyntaxBuilder/StringConvenienceInitializers.swift

@@ -34,6 +34,12 @@ extension String: ExpressibleAsStringLiteralExpr {
   }
 }
 
+extension String: ExpressibleAsBinaryOperatorExpr {
+  public func createBinaryOperatorExpr() -> BinaryOperatorExpr {
+    BinaryOperatorExpr(self)
+  }
+}
+
 /// Default conformance to `ExpressibleByTypeBuildable`
 extension String {
   public func createTypeBuildable() -> TypeBuildable {

Sources/SwiftSyntaxBuilder/gyb_generated/Buildables.swift

@@ -12318,7 +12318,7 @@ extension VersionTuple: ExpressibleAsVersionTuple {
   }
 }
 
-extension TokenSyntax: ExpressibleAsIdentifierList, ExpressibleAsTokenList, ExpressibleAsNonEmptyTokenList {
+extension TokenSyntax: ExpressibleAsIdentifierList, ExpressibleAsTokenList, ExpressibleAsNonEmptyTokenList, ExpressibleAsBinaryOperatorExpr {
 }
 
 // MARK: - Syntax Collection buildable expressible as conformances
@@ -12583,6 +12583,12 @@ extension ExpressibleAsMemberDeclList {
   }
 }
 
+extension TokenSyntax {
+  public func createBinaryOperatorExpr() -> BinaryOperatorExpr {
+    BinaryOperatorExpr(operatorToken: self)
+  }
+}
+
 extension ExpressibleAsDeclBuildable {
   public func createCodeBlockItem() -> CodeBlockItem {
     CodeBlockItem(item: self)

Tests/SwiftSyntaxBuilderTest/BinaryOperatorExprTests.swift

@@ -0,0 +1,25 @@
+import XCTest
+import SwiftSyntax
+import SwiftSyntaxBuilder
+
+final class BinaryOperatorExprTests: XCTestCase {
+  func testBinaryOperatorExprConvenienceInitializers() {
+    let leadingTrivia = Trivia.garbageText("␣")
+    let testCases: [UInt: (ExpressibleAsBinaryOperatorExpr, String)] = [
+      #line: (BinaryOperatorExpr("=="), "␣ == "),
+      #line: (TokenSyntax.unspacedBinaryOperator("=="), "␣=="),
+      #line: ("==", "␣ == "),
+    ]
+
+    for (line, testCase) in testCases {
+      let (builder, expected) = testCase
+      let binaryOperatorExpr = builder.createBinaryOperatorExpr()
+      let syntax = binaryOperatorExpr.buildSyntax(format: Format(), leadingTrivia: leadingTrivia)
+
+      var text = ""
+      syntax.write(to: &text)
+
+      XCTAssertEqual(text, expected, line: line)
+    }
+  }
+}

Tests/SwiftSyntaxBuilderTest/FunctionTests.swift

@@ -21,7 +21,7 @@ final class FunctionTests: XCTestCase {
       IfStmt(conditions: ExprList([
         IntegerLiteralExpr(digits: "n"),
 
-        BinaryOperatorExpr(operatorToken: .unspacedBinaryOperator("<=")),
+        BinaryOperatorExpr("<="),
 
         IntegerLiteralExpr(1)
       ]), body: ifCodeBlock)
@@ -31,19 +31,19 @@ final class FunctionTests: XCTestCase {
           TupleExprElement(expression: SequenceExpr(elementsBuilder: {
             IntegerLiteralExpr(digits: "n")
 
-            BinaryOperatorExpr(operatorToken: .unspacedBinaryOperator("-"))
+            BinaryOperatorExpr("-")
 
             IntegerLiteralExpr(1)
           }))
         })
 
-        BinaryOperatorExpr(operatorToken: .spacedBinaryOperator("+"))
+        BinaryOperatorExpr("+")
 
         FunctionCallExpr("fibonacci", leftParen: .leftParen, rightParen: .rightParen, argumentListBuilder: {
           TupleExprElement(expression: SequenceExpr(elementsBuilder: {
             IntegerLiteralExpr(digits: "n")
 
-            BinaryOperatorExpr(operatorToken: .unspacedBinaryOperator("-"))
+            BinaryOperatorExpr("-")
 
             IntegerLiteralExpr(2)
           }))
@@ -56,10 +56,10 @@ final class FunctionTests: XCTestCase {
 
     XCTAssertEqual(syntax.description, """
       func fibonacci(_ n: Int)-> Int{
-          if n<=1{
+          if n <= 1{
               return n
           }
-          return fibonacci(n-1) + fibonacci(n-2)
+          return fibonacci(n - 1) + fibonacci(n - 2)
       }
       """)
   }