Move frog/leg to lib/compiler/implementation.

frog/leg/tree/visitors.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.
-
-class AbstractVisitor<R> implements Visitor<R> {
-  const AbstractVisitor();
-
-  abstract R visitNode(Node node);
-
-  R visitBlock(Block node) => visitStatement(node);
-  R visitBreakStatement(BreakStatement node) => visitGotoStatement(node);
-  R visitCatchBlock(CatchBlock node) => visitNode(node);
-  R visitClassNode(ClassNode node) => visitNode(node);
-  R visitConditional(Conditional node) => visitExpression(node);
-  R visitContinueStatement(ContinueStatement node) => visitGotoStatement(node);
-  R visitDoWhile(DoWhile node) => visitLoop(node);
-  R visitEmptyStatement(EmptyStatement node) => visitStatement(node);
-  R visitExpression(Expression node) => visitNode(node);
-  R visitExpressionStatement(ExpressionStatement node) => visitStatement(node);
-  R visitFor(For node) => visitLoop(node);
-  R visitForInStatement(ForInStatement node) => visitLoop(node);
-  R visitFunctionDeclaration(FunctionDeclaration node) => visitStatement(node);
-  R visitFunctionExpression(FunctionExpression node) => visitExpression(node);
-  R visitGotoStatement(GotoStatement node) => visitStatement(node);
-  R visitIdentifier(Identifier node) => visitExpression(node);
-  R visitIf(If node) => visitStatement(node);
-  R visitLabeledStatement(LabeledStatement node) => visitStatement(node);
-  R visitLiteral(Literal node) => visitExpression(node);
-  R visitLiteralBool(LiteralBool node) => visitLiteral(node);
-  R visitLiteralDouble(LiteralDouble node) => visitLiteral(node);
-  R visitLiteralInt(LiteralInt node) => visitLiteral(node);
-  R visitLiteralList(LiteralList node) => visitExpression(node);
-  R visitLiteralMap(LiteralMap node) => visitExpression(node);
-  R visitLiteralMapEntry(LiteralMapEntry node) => visitNode(node);
-  R visitLiteralNull(LiteralNull node) => visitLiteral(node);
-  R visitLiteralString(LiteralString node) => visitStringNode(node);
-  R visitStringJuxtaposition(StringJuxtaposition node) => visitStringNode(node);
-  R visitLoop(Loop node) => visitStatement(node);
-  R visitModifiers(Modifiers node) => visitNode(node);
-  R visitNamedArgument(NamedArgument node) => visitExpression(node);
-  R visitNewExpression(NewExpression node) => visitExpression(node);
-  R visitNodeList(NodeList node) => visitNode(node);
-  R visitOperator(Operator node) => visitIdentifier(node);
-  R visitParenthesizedExpression(ParenthesizedExpression node) {
-    return visitExpression(node);
-  }
-  R visitPostfix(Postfix node) => visitNodeList(node);
-  R visitPrefix(Prefix node) => visitNodeList(node);
-  R visitReturn(Return node) => visitStatement(node);
-  R visitScriptTag(ScriptTag node) => visitNode(node);
-  R visitSend(Send node) => visitExpression(node);
-  R visitSendSet(SendSet node) => visitSend(node);
-  R visitStatement(Statement node) => visitNode(node);
-  R visitStringNode(StringNode node) => visitExpression(node);
-  R visitStringInterpolation(StringInterpolation node) => visitStringNode(node);
-  R visitStringInterpolationPart(StringInterpolationPart node) {
-    return visitNode(node);
-  }
-  R visitSwitchCase(SwitchCase node) => visitNode(node);
-  R visitSwitchStatement(SwitchStatement node) => visitStatement(node);
-  R visitThrow(Throw node) => visitStatement(node);
-  R visitTryStatement(TryStatement node) => visitStatement(node);
-  R visitTypeAnnotation(TypeAnnotation node) => visitNode(node);
-  R visitTypedef(Typedef node) => visitNode(node);
-  R visitTypeVariable(TypeVariable node) => visitNode(node);
-  R visitVariableDefinitions(VariableDefinitions node) => visitStatement(node);
-  R visitWhile(While node) => visitLoop(node);
-}
-
-/**
- * This visitor takes another visitor and applies it to every
- * node in the tree. There is currently no way to control the
- * traversal.
- */
-class TraversingVisitor extends AbstractVisitor {
-  final Visitor visitor;
-
-  TraversingVisitor(Visitor this.visitor);
-
-  visitNode(Node node) {
-    node.accept(visitor);
-    node.visitChildren(this);
-  }
-}