[astgen] Add support for ArrayExpr.

include/swift/AST/CASTBridging.h

@@ -124,6 +124,9 @@ void *SwiftIntegerLiteralExpr_create(void *ctx, const uint8_t *_Nullable string,
 
 void *SwiftBooleanLiteralExpr_create(void *ctx, _Bool value, void *TokenLoc);
 
+void *ArrayExpr_create(void *ctx, void *lLoc, BridgedArrayRef elements,
+                       BridgedArrayRef commas, void *rLoc);
+
 void *SwiftVarDecl_create(void *ctx, BridgedIdentifier _Nullable name,
                           void *initExpr, void *loc, _Bool isStatic,
                           _Bool isLet, void *dc);

lib/AST/CASTBridging.cpp

@@ -133,6 +133,14 @@ void *SwiftIntegerLiteralExpr_create(void *ctx, const uint8_t *_Nullable string,
       getSourceLocFromPointer(TokenLoc));
 }
 
+void *ArrayExpr_create(void *ctx, void *lLoc, BridgedArrayRef elements,
+                       BridgedArrayRef commas, void *rLoc) {
+  ASTContext &Context = *static_cast<ASTContext *>(ctx);
+  return ArrayExpr::create(
+      Context, getSourceLocFromPointer(lLoc), getArrayRef<Expr *>(elements),
+      getArrayRef<SourceLoc>(commas), getSourceLocFromPointer(rLoc));
+}
+
 void *SwiftBooleanLiteralExpr_create(void *ctx, bool value, void *TokenLoc) {
   ASTContext &Context = *static_cast<ASTContext *>(ctx);
   return new (Context)

lib/ASTGen/Sources/ASTGen/Literals.swift

@@ -26,4 +26,22 @@ extension ASTGenVisitor {
     let value = node.booleanLiteral == .trueKeyword()
     return .expr(SwiftBooleanLiteralExpr_create(ctx, value, loc))
   }
+
+  public func visit(_ node: ArrayExprSyntax) -> ASTNode {
+    let lLoc = self.base.advanced(by: node.leftSquare.position.utf8Offset).raw
+    let rLoc = self.base.advanced(by: node.rightSquare.position.utf8Offset).raw
+
+    let elements = node.elements.map { self.visit($0).rawValue }
+    let commas = node.elements
+      .compactMap { $0.trailingComma }
+      .map {
+        self.base.advanced(by: $0.position.utf8Offset).raw
+      }
+
+    return elements.withBridgedArrayRef { elementsRef in
+      commas.withBridgedArrayRef { commasRef in
+        .expr(ArrayExpr_create(ctx, lLoc, elementsRef, commasRef, rLoc))
+      }
+    }
+  }
 }

lib/ASTGen/Sources/ASTGen/Misc.swift

@@ -22,4 +22,8 @@ extension ASTGenVisitor {
   public func visit(_ node: CodeBlockItemSyntax) -> ASTNode {
     visit(node.item)
   }
+
+  public func visit(_ node: ArrayElementSyntax) -> ASTNode {
+    visit(node.expression)
+  }
 }