ClickHouse/programs/keeper-client/Parser.cpp

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#include "Parser.h"
#include "KeeperClient.h"
namespace DB
{
bool parseKeeperArg(IParser::Pos & pos, Expected & expected, String & result)
{
if (pos->type == TokenType::QuotedIdentifier || pos->type == TokenType::StringLiteral)
{
if (!parseIdentifierOrStringLiteral(pos, expected, result))
return false;
}
while (pos->type != TokenType::Whitespace && pos->type != TokenType::EndOfStream && pos->type != TokenType::Semicolon)
{
result.append(pos->begin, pos->end);
++pos;
}
ParserToken{TokenType::Whitespace}.ignore(pos);
if (result.empty())
return false;
return true;
}
bool parseKeeperPath(IParser::Pos & pos, Expected & expected, String & path)
{
expected.add(pos, "path");
return parseKeeperArg(pos, expected, path);
}
bool KeeperParser::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
{
auto query = std::make_shared<ASTKeeperQuery>();
for (const auto & pair : KeeperClient::commands)
expected.add(pos, pair.first.data());
for (const auto & flwc : four_letter_word_commands)
expected.add(pos, flwc.data());
if (pos->type != TokenType::BareWord)
return false;
String command_name(pos->begin, pos->end);
Command command;
auto iter = KeeperClient::commands.find(command_name);
if (iter == KeeperClient::commands.end())
{
if (command_name.size() == 4)
{
/// Treat it like four-letter command
/// Since keeper server can potentially have different version we don't want to match this command with embedded list
command = std::make_shared<FourLetterWordCommand>();
command_name = command->getName();
/// We also don't move the position, so the command will be parsed as an argument
}
else
return false;
}
else
{
command = iter->second;
++pos;
ParserToken{TokenType::Whitespace}.ignore(pos);
}
query->command = command_name;
if (!command->parse(pos, query, expected))
return false;
ParserToken{TokenType::Whitespace}.ignore(pos);
node = query;
return true;
}
}