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

#pragma once

#include <DB/Parsers/IAST.h>


namespace DB
{

/** List of expressions, for example "a, b + c, f(d)"
  */
class ASTExpressionList : public IAST
{
public:
	ASTExpressionList() = default;
	ASTExpressionList(const StringRange range_) : IAST(range_) {}

	String getID() const override { return "ExpressionList"; }

	ASTPtr clone() const override
	{
		const auto res = std::make_shared<ASTExpressionList>(*this);
		res->children.clear();

		for (const auto & child : children)
			res->children.emplace_back(child->clone());

		return res;
	}

	void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
	{
		for (ASTs::const_iterator it = children.begin(); it != children.end(); ++it)
		{
			if (it != children.begin())
				settings.ostr << ", ";

			(*it)->formatImpl(settings, state, frame);
		}
	}

	/** Вывести список выражений в секциях запроса SELECT - по одному выражению на строку.
	  */
	void formatImplMultiline(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
	{
		std::string indent_str = "\n" + std::string(4 * (frame.indent + 1), ' ');

		++frame.indent;
		for (ASTs::const_iterator it = children.begin(); it != children.end(); ++it)
		{
			if (it != children.begin())
				settings.ostr << ", ";

			if (children.size() > 1)
				settings.ostr << indent_str;

			(*it)->formatImpl(settings, state, frame);
		}
	}
};

}