Ternary operator support for polymer_expressions

pkg/polymer_expressions/lib/expression.dart

 // Copyright (c) 2013, 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.
 
 library polymer_expressions.expression;
 
 import 'visitor.dart';
 
 // Helper functions for building expression trees programmatically
 
 EmptyExpression empty() => const EmptyExpression();
 Literal literal(v) => new Literal(v);
 MapLiteral mapLiteral(List<MapLiteralEntry> entries) => new MapLiteral(entries);
 MapLiteralEntry mapLiteralEntry(Literal key, Expression value) =>
     new MapLiteralEntry(key, value);
 Identifier ident(String v) => new Identifier(v);
 ParenthesizedExpression paren(Expression e) => new ParenthesizedExpression(e);
 UnaryOperator unary(String op, Expression e) => new UnaryOperator(op, e);
 BinaryOperator binary(Expression l, String op, Expression r) =>
     new BinaryOperator(l, op, r);
 Getter getter(Expression e, String m) => new Getter(e, m);
 Index index(Expression e, Expression a) => new Index(e, a);
 Invoke invoke(Expression e, String m, List<Expression> a) =>
     new Invoke(e, m, a);
 InExpression inExpr(Expression l, Expression r) => new InExpression(l, r);
-
+TernaryOperator ternary(Expression c, Expression t, Expression f) =>
+    new TernaryOperator(c, t, f);
 
 class AstFactory {
   EmptyExpression empty() => const EmptyExpression();
 
   Literal literal(v) => new Literal(v);
 
   MapLiteral mapLiteral(List<MapLiteralEntry> entries) =>
       new MapLiteral(entries);
 
   MapLiteralEntry mapLiteralEntry(Literal key, Expression value) =>
       new MapLiteralEntry(key, value);
 
   Identifier identifier(String v) => new Identifier(v);
 
   ParenthesizedExpression parenthesized(Expression e) =>
       new ParenthesizedExpression(e);
 
   UnaryOperator unary(String op, Expression e) => new UnaryOperator(op, e);
 
   BinaryOperator binary(Expression l, String op, Expression r) =>
       new BinaryOperator(l, op, r);
 
+  TernaryOperator ternary(Expression c, Expression t, Expression f) =>
+      new TernaryOperator(c, t, f);
+
   Getter getter(Expression g, String n) => new Getter(g, n);
 
   Index index(Expression e, Expression a) => new Index(e, a);
 
   Invoke invoke(Expression e, String m, List<Expression> a) =>
       new Invoke(e, m, a);
 
   InExpression inExpr(Expression l, Expression r) => new InExpression(l, r);
 }
 
@@ skipping 107 matching lines @@
 
   String toString() => '($left $operator $right)';
 
   bool operator ==(o) => o is BinaryOperator && o.operator == operator
       && o.left == left && o.right == right;
 
   int get hashCode => _JenkinsSmiHash.hash3(operator.hashCode, left.hashCode,
       right.hashCode);
 }
 
+class TernaryOperator extends Expression {
+  final Expression condition;
+  final Expression trueExpr;
+  final Expression falseExpr;
+
+  TernaryOperator(this.condition, this.trueExpr, this.falseExpr);
+
+  accept(Visitor v) => v.visitTernaryOperator(this);
+
+  String toString() => '($condition ? $trueExpr : $falseExpr)';
+
+  bool operator ==(o) => o is TernaryOperator
+      && o.condition == condition
+      && o.trueExpr == trueExpr
+      && o.falseExpr == falseExpr;
+
+  int get hashCode => _JenkinsSmiHash.hash3(condition.hashCode,
+      trueExpr.hashCode, falseExpr.hashCode);
+}
+
 class InExpression extends Expression {
   final Expression left;
   final Expression right;
 
   InExpression(this.left, this.right);
 
   accept(Visitor v) => v.visitInExpression(this);
 
   String toString() => '($left in $right)';
 
@@ skipping 102 matching lines @@
   }
 
   static int hash2(int a, int b) => finish(combine(combine(0, a), b));
 
   static int hash3(int a, int b, int c) =>
       finish(combine(combine(combine(0, a), b), c));
 
   static int hash4(int a, int b, int c, int d) =>
       finish(combine(combine(combine(combine(0, a), b), c), d));
 }