mirror of
https://github.com/ClickHouse/ClickHouse.git
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118 lines
2.2 KiB
C++
118 lines
2.2 KiB
C++
#include <DB/Parsers/ASTLiteral.h>
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#include <DB/Parsers/ASTIdentifier.h>
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#include <DB/Parsers/ASTShowTablesQuery.h>
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#include <DB/Parsers/CommonParsers.h>
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#include <DB/Parsers/ParserShowTablesQuery.h>
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#include <DB/Parsers/ExpressionElementParsers.h>
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namespace DB
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{
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bool ParserShowTablesQuery::parseImpl(Pos & pos, Pos end, ASTPtr & node, Expected & expected)
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{
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Pos begin = pos;
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ParserWhiteSpaceOrComments ws;
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ParserString s_show("SHOW", true, true);
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ParserString s_tables("TABLES", true, true);
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ParserString s_databases("DATABASES", true, true);
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ParserString s_from("FROM", true, true);
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ParserString s_not("NOT", true, true);
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ParserString s_like("LIKE", true, true);
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ParserString s_format("FORMAT", true, true);
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ParserStringLiteral like_p;
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ParserIdentifier name_p;
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ASTPtr like;
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ASTPtr database;
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ASTPtr format;
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ASTShowTablesQuery * query = new ASTShowTablesQuery;
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ASTPtr query_ptr = query;
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ws.ignore(pos, end);
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if (!s_show.ignore(pos, end, expected))
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return false;
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ws.ignore(pos, end);
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if (s_databases.ignore(pos, end))
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{
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query->databases = true;
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}
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else if (s_tables.ignore(pos, end, expected))
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{
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ws.ignore(pos, end);
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if (s_from.ignore(pos, end, expected))
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{
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ws.ignore(pos, end);
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if (!name_p.parse(pos, end, database, expected))
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return false;
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}
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ws.ignore(pos, end);
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if (s_not.ignore(pos, end, expected))
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{
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ws.ignore(pos, end);
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query->not_like = true;
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}
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if (s_like.ignore(pos, end, expected))
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{
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ws.ignore(pos, end);
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if (!like_p.parse(pos, end, like, expected))
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return false;
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}
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else if (query->not_like)
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return false;
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}
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else
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{
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pos = begin;
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return false;
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}
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ws.ignore(pos, end);
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if (s_format.ignore(pos, end, expected))
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{
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ws.ignore(pos, end);
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ParserIdentifier format_p;
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if (!format_p.parse(pos, end, format, expected))
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return false;
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typeid_cast<ASTIdentifier &>(*format).kind = ASTIdentifier::Format;
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ws.ignore(pos, end);
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}
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query->range = StringRange(begin, pos);
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if (database)
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query->from = typeid_cast<ASTIdentifier &>(*database).name;
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if (like)
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query->like = safeGet<const String &>(typeid_cast<ASTLiteral &>(*like).value);
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if (format)
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{
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query->format = format;
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query->children.push_back(format);
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}
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node = query_ptr;
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return true;
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}
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}
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