1 | #include <Parsers/ASTIdentifier.h> |
2 | #include <Parsers/ASTLiteral.h> |
3 | #include <Parsers/ASTSetQuery.h> |
4 | |
5 | #include <Parsers/CommonParsers.h> |
6 | #include <Parsers/ParserSetQuery.h> |
7 | |
8 | #include <Common/typeid_cast.h> |
9 | |
10 | |
11 | namespace DB |
12 | { |
13 | |
14 | |
15 | /// Parse `name = value`. |
16 | static bool parseNameValuePair(SettingChange & change, IParser::Pos & pos, Expected & expected) |
17 | { |
18 | ParserIdentifier name_p; |
19 | ParserLiteral value_p; |
20 | ParserToken s_eq(TokenType::Equals); |
21 | |
22 | ASTPtr name; |
23 | ASTPtr value; |
24 | |
25 | if (!name_p.parse(pos, name, expected)) |
26 | return false; |
27 | |
28 | if (!s_eq.ignore(pos, expected)) |
29 | return false; |
30 | |
31 | if (!value_p.parse(pos, value, expected)) |
32 | return false; |
33 | |
34 | tryGetIdentifierNameInto(name, change.name); |
35 | change.value = value->as<ASTLiteral &>().value; |
36 | |
37 | return true; |
38 | } |
39 | |
40 | |
41 | bool ParserSetQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected) |
42 | { |
43 | ParserToken s_comma(TokenType::Comma); |
44 | |
45 | if (!parse_only_internals) |
46 | { |
47 | ParserKeyword s_set("SET" ); |
48 | |
49 | if (!s_set.ignore(pos, expected)) |
50 | return false; |
51 | } |
52 | |
53 | SettingsChanges changes; |
54 | |
55 | while (true) |
56 | { |
57 | if (!changes.empty() && !s_comma.ignore(pos)) |
58 | break; |
59 | |
60 | changes.push_back(SettingChange{}); |
61 | |
62 | if (!parseNameValuePair(changes.back(), pos, expected)) |
63 | return false; |
64 | } |
65 | |
66 | auto query = std::make_shared<ASTSetQuery>(); |
67 | node = query; |
68 | |
69 | query->is_standalone = !parse_only_internals; |
70 | query->changes = std::move(changes); |
71 | |
72 | return true; |
73 | } |
74 | |
75 | |
76 | } |
77 | |