ClickHouse/dbms/include/DB/Parsers/ASTColumnDeclaration.h

#pragma once

#include <DB/Parsers/IAST.h>

namespace DB
{

/** Name, type, default-specifier, default-expression.
 *  The type is optional if default-expression is specified.
 */
class ASTColumnDeclaration : public IAST
{
public:
	String name;
	ASTPtr type;
	String default_specifier;
	ASTPtr default_expression;

    ASTColumnDeclaration() = default;
    ASTColumnDeclaration(const StringRange range) : IAST{range} {}

	String getID() const override { return "ColumnDeclaration_" + name; }

	ASTPtr clone() const override
	{
		const auto res = new ASTColumnDeclaration{*this};
		ASTPtr ptr{res};

		res->children.clear();

		if (type) {
			res->type = type->clone();
			res->children.push_back(res->type);
		}

		if (default_expression) {
			res->default_expression = default_expression->clone();
			res->children.push_back(res->default_expression);
		}

		return ptr;
	}

protected:
	void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
	{
		frame.need_parens = false;
		std::string indent_str = settings.one_line ? "" : std::string(4 * frame.indent, ' ');

		settings.ostr << settings.nl_or_ws << indent_str << backQuoteIfNeed(name);
		if (type)
		{
			settings.ostr << ' ';
			type->formatImpl(settings, state, frame);
		}

		if (default_expression)
		{
			settings.ostr << ' ' << (settings.hilite ? hilite_keyword : "") << default_specifier << (settings.hilite ? hilite_none : "") << ' ';
			default_expression->formatImpl(settings, state, frame);
		}
	}
};

}