Implement string interpolation up to SSA.

dart/frog/leg/tree/nodes.dart

 // Copyright (c) 2011, 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.
 
 interface Visitor<R> {
   R visitBlock(Block node);
   R visitClassNode(ClassNode node);
   R visitConditional(Conditional node);
   R visitDoWhile(DoWhile node);
   R visitExpressionStatement(ExpressionStatement node);
   R visitFor(For node);
   R visitFunctionExpression(FunctionExpression node);
   R visitIdentifier(Identifier node);
   R visitIf(If node);
   R visitLiteralBool(LiteralBool node);
   R visitLiteralDouble(LiteralDouble node);
   R visitLiteralInt(LiteralInt node);
   R visitLiteralList(LiteralList node);
   R visitLiteralNull(LiteralNull node);
   R visitLiteralString(LiteralString node);
   R visitModifiers(Modifiers node);
   R visitNewExpression(NewExpression node);
   R visitNodeList(NodeList node);
   R visitOperator(Operator node);
   R visitParenthesizedExpression(ParenthesizedExpression node);
   R visitReturn(Return node);
   R visitSend(Send node);
   R visitSendSet(SendSet node);
+  R visitStringInterpolation(StringInterpolation node);
+  R visitStringInterpolationPart(StringInterpolationPart node);
   R visitThrow(Throw node);
   R visitTypeAnnotation(TypeAnnotation node);
   R visitVariableDefinitions(VariableDefinitions node);
   R visitWhile(While node);
 }
 
 Token firstBeginToken(Node first, Node second) {
   return (first !== null) ? first.getBeginToken()
                           : second.getBeginToken();
 }
@@ skipping 53 matching lines @@
   LiteralNull asLiteralNull() => null;
   LiteralString asLiteralString() => null;
   LiteralList asLiteralList() => null;
   Modifiers asModifiers() => null;
   NodeList asNodeList() => null;
   Operator asOperator() => null;
   ParenthesizedExpression asParenthesizedExpression() => null;
   Return asReturn() => null;
   Send asSend() => null;
   SendSet asSendSet() => null;
+  StringInterpolation asStringInterpolation() => null;
+  StringInterpolationPart asStringInterpolationPart() => null;
   Throw asThrow() => null;
   TypeAnnotation asTypeAnnotation() => null;
   VariableDefinitions asVariableDefinitions() => null;
   While asWhile() => null;
 }
 
 class ClassNode extends Node {
   final Identifier name;
   final TypeAnnotation superclass;
   final NodeList interfaces;
@@ skipping 697 matching lines @@
   accept(Visitor visitor) => visitor.visitModifiers(this);
   visitChilren(Visitor visitor) => nodes.accept(visitor);
 
   bool isStatic() => (flags & FLAG_STATIC) != 0;
   bool isAbstract() => (flags & FLAG_ABSTRACT) != 0;
   bool isFinal() => (flags & FLAG_FINAL) != 0;
   bool isVar() => (flags & FLAG_VAR) != 0;
   bool isConst() => (flags & FLAG_CONST) != 0;
 }
 
+class StringInterpolation extends Expression {
+  final LiteralString string;
+  final NodeList parts;
+
+  StringInterpolation(this.string, this.parts);
+
+  StringInterpolation asStringInterpolation() => this;
+
+  accept(Visitor visitor) => visitor.visitStringInterpolation(this);
+
+  visitChildren(Visitor visitor) {
+    string.accept(visitor);
+    parts.accept(visitor);
+  }
+
+  Token getBeginToken() => string.getBeginToken();
+
+  Token getEndToken() => parts.getEndToken();
+}
+
+class StringInterpolationPart extends Node {
+  final Expression expression;
+  final LiteralString string;
+
+  StringInterpolationPart(this.expression, this.string);
+
+  StringInterpolationPart asStringInterpolationPart() => this;
+
+  accept(Visitor visitor) => visitor.visitStringInterpolationPart(this);
+
+  visitChildren(Visitor visitor) {
+    expression.accept(visitor);
+    string.accept(visitor);
+  }
+
+  Token getBeginToken() => expression.getBeginToken();
+
+  Token getEndToken() => string.getEndToken();
+}
+
 class UnimplementedExpression extends Expression {
   final String description;
   final NodeList nodes;
 
   UnimplementedExpression(this.description, List<Node> nodes)
     : this.nodes = new NodeList(null, new Link<Node>.fromList(nodes));
 
   toString() => '$description($nodes)';
 
   Token getBeginToken() => nodes.getBeginToken();
 
   Token getEndToken() => nodes.getEndToken();
 }
 
 class UnimplementedStatement extends Statement {
   final String description;
   final NodeList nodes;
 
   UnimplementedStatement(this.description, List<Node> nodes)
     : this.nodes = new NodeList(null, new Link<Node>.fromList(nodes));
 
   toString() => '$description($nodes)';
 
   Token getBeginToken() => nodes.getBeginToken();
 
   Token getEndToken() => nodes.getEndToken();
 }