1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
#include "use.h"
#include "evaluate.h"
namespace NSQLComplete {
namespace {
class TVisitor: public SQLv1Antlr4BaseVisitor {
public:
TVisitor(
antlr4::TokenStream* tokens,
size_t cursorPosition,
const TEnvironment* env)
: Tokens_(tokens)
, CursorPosition_(cursorPosition)
, Env_(env)
{
}
std::any visitSql_stmt_core(SQLv1::Sql_stmt_coreContext* ctx) override {
if (ctx->use_stmt() || IsEnclosing(ctx)) {
return visitChildren(ctx);
}
return {};
}
std::any visitUse_stmt(SQLv1::Use_stmtContext* ctx) override {
SQLv1::Cluster_exprContext* expr = ctx->cluster_expr();
if (!expr) {
return {};
}
std::string provider;
std::string cluster;
if (SQLv1::An_idContext* ctx = expr->an_id()) {
provider = ctx->getText();
}
if (SQLv1::Pure_column_or_namedContext* ctx = expr->pure_column_or_named()) {
if (auto id = GetId(ctx)) {
cluster = std::move(*id);
}
}
if (cluster.empty()) {
return {};
}
return TUseContext{
.Provider = std::move(provider),
.Cluster = std::move(cluster),
};
}
std::any aggregateResult(std::any aggregate, std::any nextResult) override {
if (nextResult.has_value()) {
return nextResult;
}
return aggregate;
}
bool shouldVisitNextChild(antlr4::tree::ParseTree* node, const std::any& /*currentResult*/) override {
return TextInterval(node).a < static_cast<ssize_t>(CursorPosition_);
}
private:
bool IsEnclosing(antlr4::tree::ParseTree* tree) const {
return TextInterval(tree).properlyContains(CursorInterval());
}
antlr4::misc::Interval TextInterval(antlr4::tree::ParseTree* tree) const {
auto tokens = tree->getSourceInterval();
if (tokens.b == -1) {
tokens.b = tokens.a;
}
return antlr4::misc::Interval(
Tokens_->get(tokens.a)->getStartIndex(),
Tokens_->get(tokens.b)->getStopIndex());
}
antlr4::misc::Interval CursorInterval() const {
return antlr4::misc::Interval(CursorPosition_, CursorPosition_);
}
TMaybe<TString> GetId(SQLv1::Pure_column_or_namedContext* ctx) const {
if (auto* x = ctx->bind_parameter()) {
return GetId(x);
} else if (auto* x = ctx->an_id()) {
return x->getText();
} else {
Y_ABORT("You should change implementation according grammar changes");
}
}
TMaybe<TString> GetId(SQLv1::Bind_parameterContext* ctx) const {
NYT::TNode node = Evaluate(ctx, *Env_);
if (!node.HasValue() || !node.IsString()) {
return Nothing();
}
return node.AsString();
}
antlr4::TokenStream* Tokens_;
size_t CursorPosition_;
const TEnvironment* Env_;
};
} // namespace
TMaybe<TUseContext> FindUseStatement(
SQLv1::Sql_queryContext* ctx,
antlr4::TokenStream* tokens,
size_t cursorPosition,
const TEnvironment& env) {
std::any result = TVisitor(tokens, cursorPosition, &env).visit(ctx);
if (!result.has_value()) {
return Nothing();
}
return std::any_cast<TUseContext>(result);
}
} // namespace NSQLComplete
|
