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LibSQL: Parse EXISTS expressions

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The EXISTS expression is a bit of an odd-man-out because it can appear
as any of the following forms:

    EXISTS (select-stmt)
    NOT EXISTS (select-stmt)
    (select-stmt)

Which makes it the only keyword expression that doesn't require its
keyword to actually be used. The consequence is that we might come
across an EXISTS expression while parsing another expression type;
NOT would have triggered a unary operator expression, and an opening
parentheses would have triggered an expression chain.
This commit is contained in:
Timothy Flynn 2021-04-23 15:29:28 -04:00 • committed by Andreas Kling
parent e62e76ca1a
commit 99b38aa3fa
4 changed files with 80 additions and 5 deletions
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16
Userland/Libraries/LibSQL/AST.h
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@ -537,6 +537,22 @@ private:
RefPtr<Expression> m_else_expression;
};
class ExistsExpression : public Expression {
public:
ExistsExpression(NonnullRefPtr<Select> select_statement, bool invert_expression)
: m_select_statement(move(select_statement))
, m_invert_expression(invert_expression)
{
}
const NonnullRefPtr<Select>& select_statement() const { return m_select_statement; }
bool invert_expression() const { return m_invert_expression; }
private:
NonnullRefPtr<Select> m_select_statement;
bool m_invert_expression;
};
class CollateExpression : public NestedExpression {
public:
CollateExpression(NonnullRefPtr<Expression> expression, String collation_name)