LibSQL: Move Lexer and Parser machinery to AST directory

The SQL engine is expected to be a fairly sizeable piece of software.
Therefore we're starting to restructure the codebase for growth.

Userland/Libraries/LibSQL/AST/AST.h

@@ -0,0 +1,978 @@
+/*
+ * Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/NonnullRefPtr.h>
+#include <AK/NonnullRefPtrVector.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/String.h>
+#include <LibSQL/AST/Token.h>
+#include <LibSQL/Forward.h>
+
+namespace SQL::AST {
+
+template<class T, class... Args>
+static inline NonnullRefPtr<T>
+create_ast_node(Args&&... args)
+{
+    return adopt_ref(*new T(forward<Args>(args)...));
+}
+
+class ASTNode : public RefCounted<ASTNode> {
+public:
+    virtual ~ASTNode() { }
+
+protected:
+    ASTNode() = default;
+};
+
+//==================================================================================================
+// Language types
+//==================================================================================================
+
+class SignedNumber final : public ASTNode {
+public:
+    explicit SignedNumber(double value)
+        : m_value(value)
+    {
+    }
+
+    double value() const { return m_value; }
+
+private:
+    double m_value;
+};
+
+class TypeName : public ASTNode {
+public:
+    TypeName(String name, NonnullRefPtrVector<SignedNumber> signed_numbers)
+        : m_name(move(name))
+        , m_signed_numbers(move(signed_numbers))
+    {
+        VERIFY(m_signed_numbers.size() <= 2);
+    }
+
+    const String& name() const { return m_name; }
+    const NonnullRefPtrVector<SignedNumber>& signed_numbers() const { return m_signed_numbers; }
+
+private:
+    String m_name;
+    NonnullRefPtrVector<SignedNumber> m_signed_numbers;
+};
+
+class ColumnDefinition : public ASTNode {
+public:
+    ColumnDefinition(String name, NonnullRefPtr<TypeName> type_name)
+        : m_name(move(name))
+        , m_type_name(move(type_name))
+    {
+    }
+
+    const String& name() const { return m_name; }
+    const NonnullRefPtr<TypeName>& type_name() const { return m_type_name; }
+
+private:
+    String m_name;
+    NonnullRefPtr<TypeName> m_type_name;
+};
+
+class CommonTableExpression : public ASTNode {
+public:
+    CommonTableExpression(String table_name, Vector<String> column_names, NonnullRefPtr<Select> select_statement)
+        : m_table_name(move(table_name))
+        , m_column_names(move(column_names))
+        , m_select_statement(move(select_statement))
+    {
+    }
+
+    const String& table_name() const { return m_table_name; }
+    const Vector<String>& column_names() const { return m_column_names; }
+    const NonnullRefPtr<Select>& select_statement() const { return m_select_statement; }
+
+private:
+    String m_table_name;
+    Vector<String> m_column_names;
+    NonnullRefPtr<Select> m_select_statement;
+};
+
+class CommonTableExpressionList : public ASTNode {
+public:
+    CommonTableExpressionList(bool recursive, NonnullRefPtrVector<CommonTableExpression> common_table_expressions)
+        : m_recursive(recursive)
+        , m_common_table_expressions(move(common_table_expressions))
+    {
+        VERIFY(!m_common_table_expressions.is_empty());
+    }
+
+    bool recursive() const { return m_recursive; }
+    const NonnullRefPtrVector<CommonTableExpression>& common_table_expressions() const { return m_common_table_expressions; }
+
+private:
+    bool m_recursive;
+    NonnullRefPtrVector<CommonTableExpression> m_common_table_expressions;
+};
+
+class QualifiedTableName : public ASTNode {
+public:
+    QualifiedTableName(String schema_name, String table_name, String alias)
+        : m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_alias(move(alias))
+    {
+    }
+
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+    const String& alias() const { return m_alias; }
+
+private:
+    String m_schema_name;
+    String m_table_name;
+    String m_alias;
+};
+
+class ReturningClause : public ASTNode {
+public:
+    struct ColumnClause {
+        NonnullRefPtr<Expression> expression;
+        String column_alias;
+    };
+
+    ReturningClause() = default;
+
+    explicit ReturningClause(Vector<ColumnClause> columns)
+        : m_columns(move(columns))
+    {
+    }
+
+    bool return_all_columns() const { return m_columns.is_empty(); };
+    const Vector<ColumnClause>& columns() const { return m_columns; }
+
+private:
+    Vector<ColumnClause> m_columns;
+};
+
+enum class ResultType {
+    All,
+    Table,
+    Expression,
+};
+
+class ResultColumn : public ASTNode {
+public:
+    ResultColumn() = default;
+
+    explicit ResultColumn(String table_name)
+        : m_type(ResultType::Table)
+        , m_table_name(move(table_name))
+    {
+    }
+
+    ResultColumn(NonnullRefPtr<Expression> expression, String column_alias)
+        : m_type(ResultType::Expression)
+        , m_expression(move(expression))
+        , m_column_alias(move(column_alias))
+    {
+    }
+
+    ResultType type() const { return m_type; }
+
+    bool select_from_table() const { return !m_table_name.is_null(); }
+    const String& table_name() const { return m_table_name; }
+
+    bool select_from_expression() const { return !m_expression.is_null(); }
+    const RefPtr<Expression>& expression() const { return m_expression; }
+    const String& column_alias() const { return m_column_alias; }
+
+private:
+    ResultType m_type { ResultType::All };
+
+    String m_table_name {};
+
+    RefPtr<Expression> m_expression {};
+    String m_column_alias {};
+};
+
+class GroupByClause : public ASTNode {
+public:
+    GroupByClause(NonnullRefPtrVector<Expression> group_by_list, RefPtr<Expression> having_clause)
+        : m_group_by_list(move(group_by_list))
+        , m_having_clause(move(having_clause))
+    {
+        VERIFY(!m_group_by_list.is_empty());
+    }
+
+    const NonnullRefPtrVector<Expression>& group_by_list() const { return m_group_by_list; }
+    const RefPtr<Expression>& having_clause() const { return m_having_clause; }
+
+private:
+    NonnullRefPtrVector<Expression> m_group_by_list;
+    RefPtr<Expression> m_having_clause;
+};
+
+class TableOrSubquery : public ASTNode {
+public:
+    TableOrSubquery() = default;
+
+    TableOrSubquery(String schema_name, String table_name, String table_alias)
+        : m_is_table(true)
+        , m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_table_alias(move(table_alias))
+    {
+    }
+
+    explicit TableOrSubquery(NonnullRefPtrVector<TableOrSubquery> subqueries)
+        : m_is_subquery(!subqueries.is_empty())
+        , m_subqueries(move(subqueries))
+    {
+    }
+
+    bool is_table() const { return m_is_table; }
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+    const String& table_alias() const { return m_table_alias; }
+
+    bool is_subquery() const { return m_is_subquery; }
+    const NonnullRefPtrVector<TableOrSubquery>& subqueries() const { return m_subqueries; }
+
+private:
+    bool m_is_table { false };
+    String m_schema_name {};
+    String m_table_name {};
+    String m_table_alias {};
+
+    bool m_is_subquery { false };
+    NonnullRefPtrVector<TableOrSubquery> m_subqueries {};
+};
+
+enum class Order {
+    Ascending,
+    Descending,
+};
+
+enum class Nulls {
+    First,
+    Last,
+};
+
+class OrderingTerm : public ASTNode {
+public:
+    OrderingTerm(NonnullRefPtr<Expression> expression, String collation_name, Order order, Nulls nulls)
+        : m_expression(move(expression))
+        , m_collation_name(move(collation_name))
+        , m_order(order)
+        , m_nulls(nulls)
+    {
+    }
+
+    const NonnullRefPtr<Expression>& expression() const { return m_expression; }
+    const String& collation_name() const { return m_collation_name; }
+    Order order() const { return m_order; }
+    Nulls nulls() const { return m_nulls; }
+
+private:
+    NonnullRefPtr<Expression> m_expression;
+    String m_collation_name;
+    Order m_order;
+    Nulls m_nulls;
+};
+
+class LimitClause : public ASTNode {
+public:
+    LimitClause(NonnullRefPtr<Expression> limit_expression, RefPtr<Expression> offset_expression)
+        : m_limit_expression(move(limit_expression))
+        , m_offset_expression(move(offset_expression))
+    {
+    }
+
+    const NonnullRefPtr<Expression>& limit_expression() const { return m_limit_expression; }
+    const RefPtr<Expression>& offset_expression() const { return m_offset_expression; }
+
+private:
+    NonnullRefPtr<Expression> m_limit_expression;
+    RefPtr<Expression> m_offset_expression;
+};
+
+//==================================================================================================
+// Expressions
+//==================================================================================================
+
+class Expression : public ASTNode {
+};
+
+class ErrorExpression final : public Expression {
+};
+
+class NumericLiteral : public Expression {
+public:
+    explicit NumericLiteral(double value)
+        : m_value(value)
+    {
+    }
+
+    double value() const { return m_value; }
+
+private:
+    double m_value;
+};
+
+class StringLiteral : public Expression {
+public:
+    explicit StringLiteral(String value)
+        : m_value(move(value))
+    {
+    }
+
+    const String& value() const { return m_value; }
+
+private:
+    String m_value;
+};
+
+class BlobLiteral : public Expression {
+public:
+    explicit BlobLiteral(String value)
+        : m_value(move(value))
+    {
+    }
+
+    const String& value() const { return m_value; }
+
+private:
+    String m_value;
+};
+
+class NullLiteral : public Expression {
+};
+
+class NestedExpression : public Expression {
+public:
+    const NonnullRefPtr<Expression>& expression() const { return m_expression; }
+
+protected:
+    explicit NestedExpression(NonnullRefPtr<Expression> expression)
+        : m_expression(move(expression))
+    {
+    }
+
+private:
+    NonnullRefPtr<Expression> m_expression;
+};
+
+class NestedDoubleExpression : public Expression {
+public:
+    const NonnullRefPtr<Expression>& lhs() const { return m_lhs; }
+    const NonnullRefPtr<Expression>& rhs() const { return m_rhs; }
+
+protected:
+    NestedDoubleExpression(NonnullRefPtr<Expression> lhs, NonnullRefPtr<Expression> rhs)
+        : m_lhs(move(lhs))
+        , m_rhs(move(rhs))
+    {
+    }
+
+private:
+    NonnullRefPtr<Expression> m_lhs;
+    NonnullRefPtr<Expression> m_rhs;
+};
+
+class InvertibleNestedExpression : public NestedExpression {
+public:
+    bool invert_expression() const { return m_invert_expression; }
+
+protected:
+    InvertibleNestedExpression(NonnullRefPtr<Expression> expression, bool invert_expression)
+        : NestedExpression(move(expression))
+        , m_invert_expression(invert_expression)
+    {
+    }
+
+private:
+    bool m_invert_expression;
+};
+
+class InvertibleNestedDoubleExpression : public NestedDoubleExpression {
+public:
+    bool invert_expression() const { return m_invert_expression; }
+
+protected:
+    InvertibleNestedDoubleExpression(NonnullRefPtr<Expression> lhs, NonnullRefPtr<Expression> rhs, bool invert_expression)
+        : NestedDoubleExpression(move(lhs), move(rhs))
+        , m_invert_expression(invert_expression)
+    {
+    }
+
+private:
+    bool m_invert_expression;
+};
+
+class ColumnNameExpression : public Expression {
+public:
+    ColumnNameExpression(String schema_name, String table_name, String column_name)
+        : m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_column_name(move(column_name))
+    {
+    }
+
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+    const String& column_name() const { return m_column_name; }
+
+private:
+    String m_schema_name;
+    String m_table_name;
+    String m_column_name;
+};
+
+enum class UnaryOperator {
+    Minus,
+    Plus,
+    BitwiseNot,
+    Not,
+};
+
+class UnaryOperatorExpression : public NestedExpression {
+public:
+    UnaryOperatorExpression(UnaryOperator type, NonnullRefPtr<Expression> expression)
+        : NestedExpression(move(expression))
+        , m_type(type)
+    {
+    }
+
+    UnaryOperator type() const { return m_type; }
+
+private:
+    UnaryOperator m_type;
+};
+
+enum class BinaryOperator {
+    // Note: These are in order of highest-to-lowest operator precedence.
+    Concatenate,
+    Multiplication,
+    Division,
+    Modulo,
+    Plus,
+    Minus,
+    ShiftLeft,
+    ShiftRight,
+    BitwiseAnd,
+    BitwiseOr,
+    LessThan,
+    LessThanEquals,
+    GreaterThan,
+    GreaterThanEquals,
+    Equals,
+    NotEquals,
+    And,
+    Or,
+};
+
+class BinaryOperatorExpression : public NestedDoubleExpression {
+public:
+    BinaryOperatorExpression(BinaryOperator type, NonnullRefPtr<Expression> lhs, NonnullRefPtr<Expression> rhs)
+        : NestedDoubleExpression(move(lhs), move(rhs))
+        , m_type(type)
+    {
+    }
+
+    BinaryOperator type() const { return m_type; }
+
+private:
+    BinaryOperator m_type;
+};
+
+class ChainedExpression : public Expression {
+public:
+    explicit ChainedExpression(NonnullRefPtrVector<Expression> expressions)
+        : m_expressions(move(expressions))
+    {
+    }
+
+    const NonnullRefPtrVector<Expression>& expressions() const { return m_expressions; }
+
+private:
+    NonnullRefPtrVector<Expression> m_expressions;
+};
+
+class CastExpression : public NestedExpression {
+public:
+    CastExpression(NonnullRefPtr<Expression> expression, NonnullRefPtr<TypeName> type_name)
+        : NestedExpression(move(expression))
+        , m_type_name(move(type_name))
+    {
+    }
+
+    const NonnullRefPtr<TypeName>& type_name() const { return m_type_name; }
+
+private:
+    NonnullRefPtr<TypeName> m_type_name;
+};
+
+class CaseExpression : public Expression {
+public:
+    struct WhenThenClause {
+        NonnullRefPtr<Expression> when;
+        NonnullRefPtr<Expression> then;
+    };
+
+    CaseExpression(RefPtr<Expression> case_expression, Vector<WhenThenClause> when_then_clauses, RefPtr<Expression> else_expression)
+        : m_case_expression(case_expression)
+        , m_when_then_clauses(when_then_clauses)
+        , m_else_expression(else_expression)
+    {
+        VERIFY(!m_when_then_clauses.is_empty());
+    }
+
+    const RefPtr<Expression>& case_expression() const { return m_case_expression; }
+    const Vector<WhenThenClause>& when_then_clauses() const { return m_when_then_clauses; }
+    const RefPtr<Expression>& else_expression() const { return m_else_expression; }
+
+private:
+    RefPtr<Expression> m_case_expression;
+    Vector<WhenThenClause> m_when_then_clauses;
+    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)
+        : NestedExpression(move(expression))
+        , m_collation_name(move(collation_name))
+    {
+    }
+
+    const String& collation_name() const { return m_collation_name; }
+
+private:
+    String m_collation_name;
+};
+
+enum class MatchOperator {
+    Like,
+    Glob,
+    Match,
+    Regexp,
+};
+
+class MatchExpression : public InvertibleNestedDoubleExpression {
+public:
+    MatchExpression(MatchOperator type, NonnullRefPtr<Expression> lhs, NonnullRefPtr<Expression> rhs, RefPtr<Expression> escape, bool invert_expression)
+        : InvertibleNestedDoubleExpression(move(lhs), move(rhs), invert_expression)
+        , m_type(type)
+        , m_escape(move(escape))
+    {
+    }
+
+    MatchOperator type() const { return m_type; }
+    const RefPtr<Expression>& escape() const { return m_escape; }
+
+private:
+    MatchOperator m_type;
+    RefPtr<Expression> m_escape;
+};
+
+class NullExpression : public InvertibleNestedExpression {
+public:
+    NullExpression(NonnullRefPtr<Expression> expression, bool invert_expression)
+        : InvertibleNestedExpression(move(expression), invert_expression)
+    {
+    }
+};
+
+class IsExpression : public InvertibleNestedDoubleExpression {
+public:
+    IsExpression(NonnullRefPtr<Expression> lhs, NonnullRefPtr<Expression> rhs, bool invert_expression)
+        : InvertibleNestedDoubleExpression(move(lhs), move(rhs), invert_expression)
+    {
+    }
+};
+
+class BetweenExpression : public InvertibleNestedDoubleExpression {
+public:
+    BetweenExpression(NonnullRefPtr<Expression> expression, NonnullRefPtr<Expression> lhs, NonnullRefPtr<Expression> rhs, bool invert_expression)
+        : InvertibleNestedDoubleExpression(move(lhs), move(rhs), invert_expression)
+        , m_expression(move(expression))
+    {
+    }
+
+    const NonnullRefPtr<Expression>& expression() const { return m_expression; }
+
+private:
+    NonnullRefPtr<Expression> m_expression;
+};
+
+class InSelectionExpression : public InvertibleNestedExpression {
+public:
+    InSelectionExpression(NonnullRefPtr<Expression> expression, NonnullRefPtr<Select> select_statement, bool invert_expression)
+        : InvertibleNestedExpression(move(expression), invert_expression)
+        , m_select_statement(move(select_statement))
+    {
+    }
+
+    const NonnullRefPtr<Select>& select_statement() const { return m_select_statement; }
+
+private:
+    NonnullRefPtr<Select> m_select_statement;
+};
+
+class InChainedExpression : public InvertibleNestedExpression {
+public:
+    InChainedExpression(NonnullRefPtr<Expression> expression, NonnullRefPtr<ChainedExpression> expression_chain, bool invert_expression)
+        : InvertibleNestedExpression(move(expression), invert_expression)
+        , m_expression_chain(move(expression_chain))
+    {
+    }
+
+    const NonnullRefPtr<ChainedExpression>& expression_chain() const { return m_expression_chain; }
+
+private:
+    NonnullRefPtr<ChainedExpression> m_expression_chain;
+};
+
+class InTableExpression : public InvertibleNestedExpression {
+public:
+    InTableExpression(NonnullRefPtr<Expression> expression, String schema_name, String table_name, bool invert_expression)
+        : InvertibleNestedExpression(move(expression), invert_expression)
+        , m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+    {
+    }
+
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+
+private:
+    String m_schema_name;
+    String m_table_name;
+};
+
+//==================================================================================================
+// Statements
+//==================================================================================================
+
+class Statement : public ASTNode {
+};
+
+class ErrorStatement final : public Statement {
+};
+
+class CreateTable : public Statement {
+public:
+    CreateTable(String schema_name, String table_name, RefPtr<Select> select_statement, bool is_temporary, bool is_error_if_table_exists)
+        : m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_select_statement(move(select_statement))
+        , m_is_temporary(is_temporary)
+        , m_is_error_if_table_exists(is_error_if_table_exists)
+    {
+    }
+
+    CreateTable(String schema_name, String table_name, NonnullRefPtrVector<ColumnDefinition> columns, bool is_temporary, bool is_error_if_table_exists)
+        : m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_columns(move(columns))
+        , m_is_temporary(is_temporary)
+        , m_is_error_if_table_exists(is_error_if_table_exists)
+    {
+    }
+
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+
+    bool has_selection() const { return !m_select_statement.is_null(); }
+    const RefPtr<Select>& select_statement() const { return m_select_statement; }
+
+    bool has_columns() const { return !m_columns.is_empty(); }
+    const NonnullRefPtrVector<ColumnDefinition>& columns() const { return m_columns; }
+
+    bool is_temporary() const { return m_is_temporary; }
+    bool is_error_if_table_exists() const { return m_is_error_if_table_exists; }
+
+private:
+    String m_schema_name;
+    String m_table_name;
+    RefPtr<Select> m_select_statement;
+    NonnullRefPtrVector<ColumnDefinition> m_columns;
+    bool m_is_temporary;
+    bool m_is_error_if_table_exists;
+};
+
+class AlterTable : public Statement {
+public:
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+
+protected:
+    AlterTable(String schema_name, String table_name)
+        : m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+    {
+    }
+
+private:
+    String m_schema_name;
+    String m_table_name;
+};
+
+class RenameTable : public AlterTable {
+public:
+    RenameTable(String schema_name, String table_name, String new_table_name)
+        : AlterTable(move(schema_name), move(table_name))
+        , m_new_table_name(move(new_table_name))
+    {
+    }
+
+    const String& new_table_name() const { return m_new_table_name; }
+
+private:
+    String m_new_table_name;
+};
+
+class RenameColumn : public AlterTable {
+public:
+    RenameColumn(String schema_name, String table_name, String column_name, String new_column_name)
+        : AlterTable(move(schema_name), move(table_name))
+        , m_column_name(move(column_name))
+        , m_new_column_name(move(new_column_name))
+    {
+    }
+
+    const String& column_name() const { return m_column_name; }
+    const String& new_column_name() const { return m_new_column_name; }
+
+private:
+    String m_column_name;
+    String m_new_column_name;
+};
+
+class AddColumn : public AlterTable {
+public:
+    AddColumn(String schema_name, String table_name, NonnullRefPtr<ColumnDefinition> column)
+        : AlterTable(move(schema_name), move(table_name))
+        , m_column(move(column))
+    {
+    }
+
+    const NonnullRefPtr<ColumnDefinition>& column() const { return m_column; }
+
+private:
+    NonnullRefPtr<ColumnDefinition> m_column;
+};
+
+class DropColumn : public AlterTable {
+public:
+    DropColumn(String schema_name, String table_name, String column_name)
+        : AlterTable(move(schema_name), move(table_name))
+        , m_column_name(move(column_name))
+    {
+    }
+
+    const String& column_name() const { return m_column_name; }
+
+private:
+    String m_column_name;
+};
+
+class DropTable : public Statement {
+public:
+    DropTable(String schema_name, String table_name, bool is_error_if_table_does_not_exist)
+        : m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_is_error_if_table_does_not_exist(is_error_if_table_does_not_exist)
+    {
+    }
+
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+    bool is_error_if_table_does_not_exist() const { return m_is_error_if_table_does_not_exist; }
+
+private:
+    String m_schema_name;
+    String m_table_name;
+    bool m_is_error_if_table_does_not_exist;
+};
+
+enum class ConflictResolution {
+    Abort,
+    Fail,
+    Ignore,
+    Replace,
+    Rollback,
+};
+
+class Insert : public Statement {
+public:
+    Insert(RefPtr<CommonTableExpressionList> common_table_expression_list, ConflictResolution conflict_resolution, String schema_name, String table_name, String alias, Vector<String> column_names, NonnullRefPtrVector<ChainedExpression> chained_expressions)
+        : m_common_table_expression_list(move(common_table_expression_list))
+        , m_conflict_resolution(conflict_resolution)
+        , m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_alias(move(alias))
+        , m_column_names(move(column_names))
+        , m_chained_expressions(move(chained_expressions))
+    {
+    }
+
+    Insert(RefPtr<CommonTableExpressionList> common_table_expression_list, ConflictResolution conflict_resolution, String schema_name, String table_name, String alias, Vector<String> column_names, RefPtr<Select> select_statement)
+        : m_common_table_expression_list(move(common_table_expression_list))
+        , m_conflict_resolution(conflict_resolution)
+        , m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_alias(move(alias))
+        , m_column_names(move(column_names))
+        , m_select_statement(move(select_statement))
+    {
+    }
+
+    Insert(RefPtr<CommonTableExpressionList> common_table_expression_list, ConflictResolution conflict_resolution, String schema_name, String table_name, String alias, Vector<String> column_names)
+        : m_common_table_expression_list(move(common_table_expression_list))
+        , m_conflict_resolution(conflict_resolution)
+        , m_schema_name(move(schema_name))
+        , m_table_name(move(table_name))
+        , m_alias(move(alias))
+        , m_column_names(move(column_names))
+    {
+    }
+
+    const RefPtr<CommonTableExpressionList>& common_table_expression_list() const { return m_common_table_expression_list; }
+    ConflictResolution conflict_resolution() const { return m_conflict_resolution; }
+    const String& schema_name() const { return m_schema_name; }
+    const String& table_name() const { return m_table_name; }
+    const String& alias() const { return m_alias; }
+    const Vector<String>& column_names() const { return m_column_names; }
+
+    bool default_values() const { return !has_expressions() && !has_selection(); };
+
+    bool has_expressions() const { return !m_chained_expressions.is_empty(); }
+    const NonnullRefPtrVector<ChainedExpression>& chained_expressions() const { return m_chained_expressions; }
+
+    bool has_selection() const { return !m_select_statement.is_null(); }
+    const RefPtr<Select>& select_statement() const { return m_select_statement; }
+
+private:
+    RefPtr<CommonTableExpressionList> m_common_table_expression_list;
+    ConflictResolution m_conflict_resolution;
+    String m_schema_name;
+    String m_table_name;
+    String m_alias;
+    Vector<String> m_column_names;
+    NonnullRefPtrVector<ChainedExpression> m_chained_expressions;
+    RefPtr<Select> m_select_statement;
+};
+
+class Update : public Statement {
+public:
+    struct UpdateColumns {
+        Vector<String> column_names;
+        NonnullRefPtr<Expression> expression;
+    };
+
+    Update(RefPtr<CommonTableExpressionList> common_table_expression_list, ConflictResolution conflict_resolution, NonnullRefPtr<QualifiedTableName> qualified_table_name, Vector<UpdateColumns> update_columns, NonnullRefPtrVector<TableOrSubquery> table_or_subquery_list, RefPtr<Expression> where_clause, RefPtr<ReturningClause> returning_clause)
+        : m_common_table_expression_list(move(common_table_expression_list))
+        , m_conflict_resolution(conflict_resolution)
+        , m_qualified_table_name(move(qualified_table_name))
+        , m_update_columns(move(update_columns))
+        , m_table_or_subquery_list(move(table_or_subquery_list))
+        , m_where_clause(move(where_clause))
+        , m_returning_clause(move(returning_clause))
+    {
+    }
+
+    const RefPtr<CommonTableExpressionList>& common_table_expression_list() const { return m_common_table_expression_list; }
+    ConflictResolution conflict_resolution() const { return m_conflict_resolution; }
+    const NonnullRefPtr<QualifiedTableName>& qualified_table_name() const { return m_qualified_table_name; }
+    const Vector<UpdateColumns>& update_columns() const { return m_update_columns; }
+    const NonnullRefPtrVector<TableOrSubquery>& table_or_subquery_list() const { return m_table_or_subquery_list; }
+    const RefPtr<Expression>& where_clause() const { return m_where_clause; }
+    const RefPtr<ReturningClause>& returning_clause() const { return m_returning_clause; }
+
+private:
+    RefPtr<CommonTableExpressionList> m_common_table_expression_list;
+    ConflictResolution m_conflict_resolution;
+    NonnullRefPtr<QualifiedTableName> m_qualified_table_name;
+    Vector<UpdateColumns> m_update_columns;
+    NonnullRefPtrVector<TableOrSubquery> m_table_or_subquery_list;
+    RefPtr<Expression> m_where_clause;
+    RefPtr<ReturningClause> m_returning_clause;
+};
+
+class Delete : public Statement {
+public:
+    Delete(RefPtr<CommonTableExpressionList> common_table_expression_list, NonnullRefPtr<QualifiedTableName> qualified_table_name, RefPtr<Expression> where_clause, RefPtr<ReturningClause> returning_clause)
+        : m_common_table_expression_list(move(common_table_expression_list))
+        , m_qualified_table_name(move(qualified_table_name))
+        , m_where_clause(move(where_clause))
+        , m_returning_clause(move(returning_clause))
+    {
+    }
+
+    const RefPtr<CommonTableExpressionList>& common_table_expression_list() const { return m_common_table_expression_list; }
+    const NonnullRefPtr<QualifiedTableName>& qualified_table_name() const { return m_qualified_table_name; }
+    const RefPtr<Expression>& where_clause() const { return m_where_clause; }
+    const RefPtr<ReturningClause>& returning_clause() const { return m_returning_clause; }
+
+private:
+    RefPtr<CommonTableExpressionList> m_common_table_expression_list;
+    NonnullRefPtr<QualifiedTableName> m_qualified_table_name;
+    RefPtr<Expression> m_where_clause;
+    RefPtr<ReturningClause> m_returning_clause;
+};
+
+class Select : public Statement {
+public:
+    Select(RefPtr<CommonTableExpressionList> common_table_expression_list, bool select_all, NonnullRefPtrVector<ResultColumn> result_column_list, NonnullRefPtrVector<TableOrSubquery> table_or_subquery_list, RefPtr<Expression> where_clause, RefPtr<GroupByClause> group_by_clause, NonnullRefPtrVector<OrderingTerm> ordering_term_list, RefPtr<LimitClause> limit_clause)
+        : m_common_table_expression_list(move(common_table_expression_list))
+        , m_select_all(move(select_all))
+        , m_result_column_list(move(result_column_list))
+        , m_table_or_subquery_list(move(table_or_subquery_list))
+        , m_where_clause(move(where_clause))
+        , m_group_by_clause(move(group_by_clause))
+        , m_ordering_term_list(move(ordering_term_list))
+        , m_limit_clause(move(limit_clause))
+    {
+    }
+
+    const RefPtr<CommonTableExpressionList>& common_table_expression_list() const { return m_common_table_expression_list; }
+    bool select_all() const { return m_select_all; }
+    const NonnullRefPtrVector<ResultColumn>& result_column_list() const { return m_result_column_list; }
+    const NonnullRefPtrVector<TableOrSubquery>& table_or_subquery_list() const { return m_table_or_subquery_list; }
+    const RefPtr<Expression>& where_clause() const { return m_where_clause; }
+    const RefPtr<GroupByClause>& group_by_clause() const { return m_group_by_clause; }
+    const NonnullRefPtrVector<OrderingTerm>& ordering_term_list() const { return m_ordering_term_list; }
+    const RefPtr<LimitClause>& limit_clause() const { return m_limit_clause; }
+
+private:
+    RefPtr<CommonTableExpressionList> m_common_table_expression_list;
+    bool m_select_all;
+    NonnullRefPtrVector<ResultColumn> m_result_column_list;
+    NonnullRefPtrVector<TableOrSubquery> m_table_or_subquery_list;
+    RefPtr<Expression> m_where_clause;
+    RefPtr<GroupByClause> m_group_by_clause;
+    NonnullRefPtrVector<OrderingTerm> m_ordering_term_list;
+    RefPtr<LimitClause> m_limit_clause;
+};
+
+}