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LibSQL: Create a very barebones SQL parser
This parser builds on the LibSQL lexer and currently only allows users to parse 'CREATE TABLE' statements.
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128
Userland/Libraries/LibSQL/AST.h
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128
Userland/Libraries/LibSQL/AST.h
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/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/NonnullRefPtr.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/RefCounted.h>
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#include <AK/String.h>
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namespace SQL {
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template<class T, class... Args>
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static inline NonnullRefPtr<T>
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create_ast_node(Args&&... args)
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{
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return adopt(*new T(forward<Args>(args)...));
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}
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class ASTNode : public RefCounted<ASTNode> {
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public:
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virtual ~ASTNode() { }
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protected:
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ASTNode() = default;
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};
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class Statement : public ASTNode {
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};
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class ErrorStatement final : public Statement {
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};
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class SignedNumber final : public ASTNode {
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public:
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explicit SignedNumber(double value)
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: m_value(value)
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{
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}
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double value() const { return m_value; }
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private:
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double m_value;
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};
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class TypeName : public ASTNode {
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public:
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TypeName(String name, NonnullRefPtrVector<SignedNumber> signed_numbers)
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: m_name(move(name))
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, m_signed_numbers(move(signed_numbers))
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{
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VERIFY(m_signed_numbers.size() <= 2);
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}
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const String& name() const { return m_name; }
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const NonnullRefPtrVector<SignedNumber> signed_numbers() const { return m_signed_numbers; }
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private:
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String m_name;
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NonnullRefPtrVector<SignedNumber> m_signed_numbers;
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};
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class ColumnDefinition : public ASTNode {
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public:
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ColumnDefinition(String name, NonnullRefPtr<TypeName> type_name)
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: m_name(move(name))
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, m_type_name(move(type_name))
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{
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}
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const String& name() const { return m_name; }
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const NonnullRefPtr<TypeName>& type_name() const { return m_type_name; }
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private:
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String m_name;
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NonnullRefPtr<TypeName> m_type_name;
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};
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class CreateTable : public Statement {
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public:
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CreateTable(String schema_name, String table_name, NonnullRefPtrVector<ColumnDefinition> columns, bool is_temporary, bool is_error_if_table_exists)
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: m_schema_name(move(schema_name))
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, m_table_name(move(table_name))
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, m_columns(move(columns))
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, m_is_temporary(is_temporary)
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, m_is_error_if_table_exists(is_error_if_table_exists)
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{
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}
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const String& schema_name() const { return m_schema_name; }
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const String& table_name() const { return m_table_name; }
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const NonnullRefPtrVector<ColumnDefinition> columns() const { return m_columns; }
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bool is_temporary() const { return m_is_temporary; }
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bool is_error_if_table_exists() const { return m_is_error_if_table_exists; }
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private:
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String m_schema_name;
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String m_table_name;
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NonnullRefPtrVector<ColumnDefinition> m_columns;
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bool m_is_temporary;
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bool m_is_error_if_table_exists;
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};
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}
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