From 48e0815842ac97a1dbfda58c276c6aa9e9713e22 Mon Sep 17 00:00:00 2001
From: thosakwe <thosakwe@gmail.com>
Date: Sat, 4 Feb 2017 16:06:32 -0500
Subject: [PATCH 1/3] FieldBuilders now works to-level

---
 lib/src/builders/field.dart | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/src/builders/field.dart b/lib/src/builders/field.dart
index 5964e4a..971de13 100644
--- a/lib/src/builders/field.dart
+++ b/lib/src/builders/field.dart
@@ -106,8 +106,7 @@ abstract class FieldBuilder
   TopLevelVariableDeclaration buildTopLevel([Scope scope]);
 }
 
-class _FieldBuilderImpl extends TopLevelMixin
-    with HasAnnotationsMixin
+class _FieldBuilderImpl extends HasAnnotationsMixin
     implements FieldBuilder {
   final Keyword _keyword;
   final String _name;
@@ -157,6 +156,11 @@ class _FieldBuilderImpl extends TopLevelMixin
     );
   }
 
+  @override
+  CompilationUnitMember buildTopLevelAst([Scope scope]) {
+    return buildTopLevel(scope);
+  }
+
   VariableDeclarationList _buildVariableList([Scope scope]) {
     return astFactory.variableDeclarationList(
       null,

From 209182fff1114d11c9acc8832346da42d405fa00 Mon Sep 17 00:00:00 2001
From: thosakwe <thosakwe@gmail.com>
Date: Sat, 4 Feb 2017 16:10:55 -0500
Subject: [PATCH 2/3] Ran dartfmt

---
 lib/src/builders/field.dart | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/src/builders/field.dart b/lib/src/builders/field.dart
index 971de13..1424463 100644
--- a/lib/src/builders/field.dart
+++ b/lib/src/builders/field.dart
@@ -106,8 +106,7 @@ abstract class FieldBuilder
   TopLevelVariableDeclaration buildTopLevel([Scope scope]);
 }
 
-class _FieldBuilderImpl extends HasAnnotationsMixin
-    implements FieldBuilder {
+class _FieldBuilderImpl extends HasAnnotationsMixin implements FieldBuilder {
   final Keyword _keyword;
   final String _name;
   final TypeBuilder _type;

From d78246c310737fd9c6f42513ca2258a4fb46cdc4 Mon Sep 17 00:00:00 2001
From: thosakwe <thosakwe@gmail.com>
Date: Sat, 4 Feb 2017 16:57:11 -0500
Subject: [PATCH 3/3] asThrow on ExpressionBuilder

---
 lib/src/builders/expression.dart       |  7 +++++++
 lib/src/builders/expression/throw.dart | 22 ++++++++++++++++++++++
 lib/src/tokens.dart                    |  3 +++
 test/builders/expression_test.dart     | 11 +++++++++++
 4 files changed, 43 insertions(+)
 create mode 100644 lib/src/builders/expression/throw.dart

diff --git a/lib/src/builders/expression.dart b/lib/src/builders/expression.dart
index 213c744..4565cb4 100644
--- a/lib/src/builders/expression.dart
+++ b/lib/src/builders/expression.dart
@@ -29,6 +29,7 @@ part 'expression/invocation.dart';
 part 'expression/negate.dart';
 part 'expression/operators.dart';
 part 'expression/return.dart';
+part 'expression/throw.dart';
 part 'expression/yield.dart';
 
 final _false =
@@ -205,6 +206,9 @@ abstract class AbstractExpressionMixin implements ExpressionBuilder {
   @override
   StatementBuilder asYieldStar() => new _AsYield(this, true);
 
+  @override
+  ExpressionBuilder asThrow() => new _ThrowExpression(this);
+
   @override
   WhileStatementBuilder asWhile({bool asDo: false}) {
     return new WhileStatementBuilder(asDo, this);
@@ -371,6 +375,9 @@ abstract class ExpressionBuilder
   /// [Statement] AST instead of an expression.
   StatementBuilder asStatement();
 
+  /// Returns as an [ExpressionBuilder] that throws this expression as an error.
+  ExpressionBuilder asThrow();
+
   /// Returns as a [StatementBuilder] that assigns to a new `var` [variable].
   ///
   /// If [type] is supplied, the resulting statement is `{type} {variable} =`.
diff --git a/lib/src/builders/expression/throw.dart b/lib/src/builders/expression/throw.dart
new file mode 100644
index 0000000..5db07c6
--- /dev/null
+++ b/lib/src/builders/expression/throw.dart
@@ -0,0 +1,22 @@
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of code_builder.src.builders.expression;
+
+class _ThrowExpression extends AbstractExpressionMixin with TopLevelMixin {
+  final ExpressionBuilder _value;
+
+  _ThrowExpression(this._value);
+
+  @override
+  ExpressionBuilder asThrow() => this;
+
+  @override
+  AstNode buildAst([Scope scope]) => buildExpression(scope);
+
+  @override
+  Expression buildExpression([Scope scope]) {
+    return astFactory.throwExpression($throw, _value.buildExpression(scope));
+  }
+}
diff --git a/lib/src/tokens.dart b/lib/src/tokens.dart
index 88687a6..1ed0993 100644
--- a/lib/src/tokens.dart
+++ b/lib/src/tokens.dart
@@ -187,6 +187,9 @@ final Token $static = new KeywordToken(Keyword.STATIC, 0);
 /// The `this` token.
 final Token $this = new KeywordToken(Keyword.THIS, 0);
 
+/// The `throw` token.
+final Token $throw = new KeywordToken(Keyword.THROW, 0);
+
 /// The `true` token.
 final Token $true = new KeywordToken(Keyword.TRUE, 0);
 
diff --git a/test/builders/expression_test.dart b/test/builders/expression_test.dart
index 571d0b9..21a4876 100644
--- a/test/builders/expression_test.dart
+++ b/test/builders/expression_test.dart
@@ -404,4 +404,15 @@ void main() {
       '''),
     );
   });
+
+  test('should throw an exception', () {
+    expect(
+        new TypeBuilder('StateError')
+            .newInstance([literal('Hey! No!')])
+            .asThrow()
+            .asStatement(),
+        equalsSource('''
+    throw new StateError('Hey! No!');
+    '''));
+  });
 }