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LibSQL: Add parsing and evaluation of BOOLEAN type literals

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This allows you to enter TRUE or FALSE in a SQL statement for BOOLEAN
types. Note that this differs from SQLite, which requires entering 1 or
0 for BOOLEANs; having explicit keywords feels a bit more natural.
This commit is contained in:
Timothy Flynn 2022-12-31 09:28:09 -05:00 • committed by Sam Atkins
parent c67c7dd1f2
commit 41e0e4cdd7
5 changed files with 43 additions and 0 deletions
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15
Userland/Libraries/LibSQL/AST/AST.h
View file

@ -357,6 +357,21 @@ private:
DeprecatedString m_value;
};
class BooleanLiteral : public Expression {
public:
explicit BooleanLiteral(bool value)
: m_value(value)
{
}
bool value() const { return m_value; }
virtual ResultOr<Value> evaluate(ExecutionContext&) const override;
private:
bool m_value { false };
};
class NullLiteral : public Expression {
public:
virtual ResultOr<Value> evaluate(ExecutionContext&) const override;

5
Userland/Libraries/LibSQL/AST/Expression.cpp
View file

@ -24,6 +24,11 @@ ResultOr<Value> StringLiteral::evaluate(ExecutionContext&) const
return Value { value() };
}
ResultOr<Value> BooleanLiteral::evaluate(ExecutionContext&) const
{
return Value { value() };
}
ResultOr<Value> NullLiteral::evaluate(ExecutionContext&) const
{
return Value {};

4
Userland/Libraries/LibSQL/AST/Parser.cpp
View file

@ -524,6 +524,10 @@ RefPtr<Expression> Parser::parse_literal_value_expression()
auto value = consume().value();
return create_ast_node<BlobLiteral>(value);
}
if (consume_if(TokenType::True))
return create_ast_node<BooleanLiteral>(true);
if (consume_if(TokenType::False))
return create_ast_node<BooleanLiteral>(false);
if (consume_if(TokenType::Null))
return create_ast_node<NullLiteral>();

2
Userland/Libraries/LibSQL/AST/Token.h
View file

@ -69,6 +69,7 @@ namespace SQL::AST {
__ENUMERATE_SQL_TOKEN("EXISTS", Exists, Keyword) \
__ENUMERATE_SQL_TOKEN("EXPLAIN", Explain, Keyword) \
__ENUMERATE_SQL_TOKEN("FAIL", Fail, Keyword) \
__ENUMERATE_SQL_TOKEN("FALSE", False, Keyword) \
__ENUMERATE_SQL_TOKEN("FILTER", Filter, Keyword) \
__ENUMERATE_SQL_TOKEN("FIRST", First, Keyword) \
__ENUMERATE_SQL_TOKEN("FOLLOWING", Following, Keyword) \
@ -151,6 +152,7 @@ namespace SQL::AST {
__ENUMERATE_SQL_TOKEN("TO", To, Keyword) \
__ENUMERATE_SQL_TOKEN("TRANSACTION", Transaction, Keyword) \
__ENUMERATE_SQL_TOKEN("TRIGGER", Trigger, Keyword) \
__ENUMERATE_SQL_TOKEN("TRUE", True, Keyword) \
__ENUMERATE_SQL_TOKEN("UNBOUNDED", Unbounded, Keyword) \
__ENUMERATE_SQL_TOKEN("UNION", Union, Keyword) \
__ENUMERATE_SQL_TOKEN("UNIQUE", Unique, Keyword) \