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walker.hpp
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walker.hpp
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#pragma once
#include <memory>
#include <utility>
#include <boost/ptr_container/ptr_vector.hpp>
#include "node.hpp"
#define NODE_WALKER_VISIT_IMPL(TYPE, FALLBACK) \
virtual void visit(TYPE& node) { \
visit(static_cast<FALLBACK&>(node)); \
}
#define NODE_WALKER_ACCEPT_IMPL(TYPE, FALLBACK) \
void TYPE::accept(NodeWalker& walker) { \
walker.visit(*this); \
}
namespace fbjs {
class NodeWalker {
private:
NodeWalker* _parent;
Node* _node;
bool _remove;
bool _skip_delete;
protected:
typedef boost::ptr_vector<NodeWalker> ptr_vector;
public:
typedef std::auto_ptr<NodeWalker> ptr;
NodeWalker() : _parent(NULL), _node(NULL), _remove(false),
_skip_delete(false) {};
virtual ~NodeWalker() {};
virtual NodeWalker* clone() const = 0;
virtual Node* walk(Node* root) {
replaceAndVisit(root);
return _node;
}
NodeWalker* parent() const {
return _parent;
}
Node* node() const {
return _node;
}
protected:
template<class T>
static T& cast(NodeWalker& node) {
T* tmp = dynamic_cast<T*>(&node);
if (tmp) {
return *tmp;
} else {
throw std::runtime_error("invalid NodeWalker");
}
}
template<class T>
static std::auto_ptr<T> cast(NodeWalker::ptr node) {
std::auto_ptr<T> casted(&cast<T>(*node));
node.release();
return casted;
}
void remove(bool skip_delete = false) {
_remove = true;
_skip_delete = skip_delete;
}
void replace(Node* new_node, bool skip_delete = false) {
if (new_node && _node) {
new_node->setLineno(_node->lineno());
}
_node = new_node;
_remove = false;
_skip_delete = skip_delete;
}
void replaceAndVisit(Node* new_node) {
replace(new_node);
if (new_node == NULL) {
visit();
} else {
new_node->accept(*this);
}
if (new_node != _node && new_node) {
delete new_node;
}
}
std::auto_ptr<ptr_vector> visitChildren() {
ptr_vector ret;
node_list_t::iterator ii = _node->childNodes().begin();
while (ii != _node->childNodes().end()) {
ret.push_back(visitChild(ii++).release());
}
return ret.release();
}
ptr visitChild(node_list_t::iterator ii) {
ptr walker(clone());
walker->_parent = this;
walker->_node = *ii;
if (*ii == NULL) {
visit();
} else {
(*ii)->accept(*walker);
}
Node* old_node = NULL;
if (walker->_remove) {
old_node = _node->removeChild(ii);
} else if (*ii != walker->_node) {
old_node = _node->replaceChild(walker->_node, ii);
}
if (!walker->_skip_delete && old_node) {
delete old_node;
}
return walker;
}
public:
virtual void visit() {}
virtual void visit(Node& _node) {
visitChildren();
}
NODE_WALKER_VISIT_IMPL(NodeProgram, Node);
NODE_WALKER_VISIT_IMPL(NodeStatementList, Node);
NODE_WALKER_VISIT_IMPL(NodeExpression, Node);
NODE_WALKER_VISIT_IMPL(NodeNumericLiteral, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeStringLiteral, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeRegexLiteral, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeBooleanLiteral, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeNullLiteral, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeThis, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeEmptyExpression, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeOperator, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeConditionalExpression, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeParenthetical, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeAssignment, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeUnary, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodePostfix, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeIdentifier, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeFunctionCall, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeFunctionConstructor, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeObjectLiteral, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeArrayLiteral, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeStaticMemberExpression, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeDynamicMemberExpression, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeStatement, Node);
NODE_WALKER_VISIT_IMPL(NodeStatementWithExpression, NodeStatement);
NODE_WALKER_VISIT_IMPL(NodeVarDeclaration, NodeStatement);
NODE_WALKER_VISIT_IMPL(NodeTypehint, Node);
NODE_WALKER_VISIT_IMPL(NodeFunctionDeclaration, Node);
NODE_WALKER_VISIT_IMPL(NodeFunctionExpression, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeArgList, Node);
NODE_WALKER_VISIT_IMPL(NodeIf, Node);
NODE_WALKER_VISIT_IMPL(NodeWith, Node);
NODE_WALKER_VISIT_IMPL(NodeTry, Node);
NODE_WALKER_VISIT_IMPL(NodeLabel, Node);
NODE_WALKER_VISIT_IMPL(NodeCaseClause, Node);
NODE_WALKER_VISIT_IMPL(NodeSwitch, Node);
NODE_WALKER_VISIT_IMPL(NodeDefaultClause, NodeCaseClause);
NODE_WALKER_VISIT_IMPL(NodeObjectLiteralProperty, Node);
NODE_WALKER_VISIT_IMPL(NodeForLoop, Node);
NODE_WALKER_VISIT_IMPL(NodeForIn, Node);
NODE_WALKER_VISIT_IMPL(NodeForEachIn, Node);
NODE_WALKER_VISIT_IMPL(NodeWhile, Node);
NODE_WALKER_VISIT_IMPL(NodeDoWhile, NodeStatement);
NODE_WALKER_VISIT_IMPL(NodeXMLDefaultNamespace, NodeStatement);
NODE_WALKER_VISIT_IMPL(NodeXMLName, Node);
NODE_WALKER_VISIT_IMPL(NodeXMLElement, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeXMLComment, Node);
NODE_WALKER_VISIT_IMPL(NodeXMLPI, Node);
NODE_WALKER_VISIT_IMPL(NodeXMLContentList, Node);
NODE_WALKER_VISIT_IMPL(NodeXMLTextData, Node);
NODE_WALKER_VISIT_IMPL(NodeXMLEmbeddedExpression, Node);
NODE_WALKER_VISIT_IMPL(NodeXMLAttributeList, Node);
NODE_WALKER_VISIT_IMPL(NodeXMLAttribute, Node);
NODE_WALKER_VISIT_IMPL(NodeWildcardIdentifier, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeStaticAttributeIdentifier, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeDynamicAttributeIdentifier, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeStaticQualifiedIdentifier, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeDynamicQualifiedIdentifier, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeFilteringPredicate, NodeExpression);
NODE_WALKER_VISIT_IMPL(NodeDescendantExpression, NodeExpression);
};
}

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