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#pragma once
#include <Common/logger_useful.h>
#include <Poco/Util/Application.h>
#include <IO/Operators.h>
#include <Parsers/IAST.h>
namespace DB
{
/// If output stream set dumps node with indents and some additional info. Do nothing otherwise.
/// Allow to print key-value pairs inside of tree dump.
class DumpASTNode
{
public:
DumpASTNode(const IAST & ast_, WriteBuffer * ostr_, size_t & depth, const char * label_ = nullptr)
: ast(ast_),
ostr(ostr_),
indent(depth),
visit_depth(depth),
label(label_)
{
if (!ostr)
return;
if (label && visit_depth == 0)
(*ostr) << "-- " << label << '\n';
++visit_depth;
(*ostr) << String(indent, ' ');
printNode();
(*ostr) << '\n';
}
~DumpASTNode()
{
if (!ostr)
return;
--visit_depth;
if (label && visit_depth == 0)
(*ostr) << "--\n";
}
template <typename T, typename U>
void print(const T & name, const U & value, const char * str_indent = nullptr) const
{
if (!ostr)
return;
(*ostr) << (str_indent ? String(str_indent) : String(indent, ' '));
(*ostr) << '(' << name << ' ' << value << ')';
if (!str_indent)
(*ostr) << '\n';
}
size_t & getDepth() { return visit_depth; }
private:
const IAST & ast;
WriteBuffer * ostr;
size_t indent;
size_t & visit_depth; /// shared with children
const char * label;
String nodeId() const { return ast.getID(' '); }
void printNode() const
{
(*ostr) << nodeId();
String alias = ast.tryGetAlias();
if (!alias.empty())
print("alias", alias, " ");
if (!ast.children.empty())
print("children", ast.children.size(), " ");
}
};
inline void dumpAST(const IAST & ast, WriteBuffer & ostr, DumpASTNode * parent = nullptr)
{
size_t depth = 0;
DumpASTNode dump(ast, &ostr, (parent ? parent->getDepth() : depth));
for (const auto & child : ast.children)
dumpAST(*child, ostr, &dump);
}
class DumpASTNodeInDotFormat
{
public:
DumpASTNodeInDotFormat(const IAST & ast_, WriteBuffer * ostr_, bool root_ = true, const char * label_ = nullptr)
: ast(ast_), ostr(ostr_), root(root_), label(label_)
{
if (!ostr)
return;
if (root)
(*ostr) << "digraph " << (label ? String(label) : "") << "{\n rankdir=\"UD\";\n";
printNode();
}
~DumpASTNodeInDotFormat()
{
if (!ostr)
return;
for (const auto & child : ast.children)
printEdge(ast, *child);
if (root)
(*ostr) << "}\n";
}
private:
const IAST & ast;
WriteBuffer * ostr;
bool root;
const char * label;
String getASTId() const { return ast.getID(' '); }
static String getNodeId(const IAST & a) { return "n" + std::to_string(reinterpret_cast<std::uintptr_t>(&a)); }
void printNode() const
{
(*ostr) << " " << getNodeId(ast) << "[label=\"";
(*ostr) << getASTId();
String alias = ast.tryGetAlias();
if (!alias.empty())
(*ostr) << " ("
<< "alias"
<< " " << alias << ")";
if (!ast.children.empty())
(*ostr) << " (children"
<< " " << ast.children.size() << ")";
(*ostr) << "\"];\n";
}
void printEdge(const IAST & parent, const IAST & child) const
{
(*ostr) << " " << getNodeId(parent) << " -> " << getNodeId(child) << ";\n";
}
};
/// Print AST in "dot" format for GraphViz
/// You can render it with: dot -Tpng ast.dot ast.png
inline void dumpASTInDotFormat(const IAST & ast, WriteBuffer & ostr, bool root = true)
{
DumpASTNodeInDotFormat dump(ast, &ostr, root);
for (const auto & child : ast.children)
dumpASTInDotFormat(*child, ostr, false);
}
/// String stream dumped in dtor
template <bool _enable>
class DebugASTLog
{
public:
DebugASTLog()
: log(nullptr)
{
if constexpr (_enable)
log = &Poco::Logger::get("AST");
}
~DebugASTLog()
{
if constexpr (_enable)
LOG_DEBUG(log, fmt::runtime(buf.str()));
}
WriteBuffer * stream() { return (_enable ? &buf : nullptr); }
private:
Poco::Logger * log;
WriteBufferFromOwnString buf;
};
}
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