lbug 0.16.1

An in-process property graph database management system built for query speed and scalability
Documentation 
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

#include "parser/visitor/statement_read_write_analyzer.h"

#include "main/client_context.h"
#include "main/db_config.h"
#include "parser/expression/parsed_expression_visitor.h"
#include "parser/query/reading_clause/reading_clause.h"
#include "parser/query/return_with_clause/with_clause.h"

namespace lbug {
namespace parser {

void StatementReadWriteAnalyzer::visitExtension(const Statement& /*statement*/) {
    // We allow LOAD EXTENSION to run in read-only mode.
    if (context->getDBConfig()->readOnly) {
        readOnly = true;
    } else {
        readOnly = false;
    }
}

void StatementReadWriteAnalyzer::visitReadingClause(const ReadingClause* readingClause) {
    if (readingClause->hasWherePredicate()) {
        if (!isExprReadOnly(readingClause->getWherePredicate())) {
            readOnly = false;
        }
    }
}

void StatementReadWriteAnalyzer::visitWithClause(const WithClause* withClause) {
    for (auto& expr : withClause->getProjectionBody()->getProjectionExpressions()) {
        if (!isExprReadOnly(expr.get())) {
            readOnly = false;
            return;
        }
    }
}

void StatementReadWriteAnalyzer::visitReturnClause(const ReturnClause* returnClause) {
    for (auto& expr : returnClause->getProjectionBody()->getProjectionExpressions()) {
        if (!isExprReadOnly(expr.get())) {
            readOnly = false;
            return;
        }
    }
}

bool StatementReadWriteAnalyzer::isExprReadOnly(const ParsedExpression* expr) {
    auto analyzer = ReadWriteExprAnalyzer(context);
    analyzer.visit(expr);
    return analyzer.isReadOnly();
}

} // namespace parser
} // namespace lbug