ClickHouse/dbms/src/Common/Macros.h

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#pragma once
#include <Core/Types.h>
#include <Core/Names.h>
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#include <map>
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namespace Poco
{
namespace Util
{
class AbstractConfiguration;
}
}
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namespace DB
{
/** Apply substitutions from the macros in config to the string.
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*/
class Macros
{
public:
Macros();
Macros(const Poco::Util::AbstractConfiguration & config, const String & key);
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/** Replace the substring of the form {macro_name} with the value for macro_name, obtained from the config file.
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* If {database} and {table} macros aren`t defined explicitly, expand them as database_name and table_name respectively.
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* level - the level of recursion.
*/
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String expand(const String & s, size_t level = 0, const String & database_name = "", const String & table_name = "") const;
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String expand(const String & s, const String & database_name, const String & table_name) const;
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/** Apply expand for the list.
*/
Names expand(const Names & source_names, size_t level = 0) const;
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using MacroMap = std::map<String, String>;
const MacroMap getMacroMap() const { return macros; }
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String getValue(const String & key) const;
private:
MacroMap macros;
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};
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}