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https://github.com/RGBCube/serenity
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LibSQL: Parse DELETE statement
This commit is contained in:
Timothy Flynn
Andreas Kling
parent
ce6c7ae18a
commit
733806b6a1
5 changed files with 284 additions and 1 deletions
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@ -101,6 +101,62 @@ private:
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NonnullRefPtr<TypeName> m_type_name;
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};
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class CommonTableExpression : public ASTNode {
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public:
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CommonTableExpression(String table_name, Vector<String> column_names)
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: m_table_name(move(table_name))
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, m_column_names(move(column_names))
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{
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}
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const String& table_name() const { return m_table_name; }
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const Vector<String>& column_names() const { return m_column_names; }
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private:
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String m_table_name;
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Vector<String> m_column_names;
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};
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class QualifiedTableName : public ASTNode {
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public:
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QualifiedTableName(String schema_name, String table_name, String alias)
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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_alias(move(alias))
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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 String& alias() const { return m_alias; }
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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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String m_alias;
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};
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class ReturningClause : public ASTNode {
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public:
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struct ColumnClause {
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NonnullRefPtr<Expression> expression;
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String column_alias;
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};
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ReturningClause() = default;
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explicit ReturningClause(Vector<ColumnClause> columns)
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: m_columns(move(columns))
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{
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}
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bool return_all_columns() const { return m_columns.is_empty(); };
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const Vector<ColumnClause>& columns() const { return m_columns; }
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private:
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Vector<ColumnClause> m_columns;
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};
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//==================================================================================================
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// Expressions
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//==================================================================================================
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@ -495,4 +551,29 @@ private:
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bool m_is_error_if_table_does_not_exist;
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};
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class Delete : public Statement {
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public:
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Delete(bool recursive, RefPtr<CommonTableExpression> common_table_expression, NonnullRefPtr<QualifiedTableName> qualified_table_name, RefPtr<Expression> where_clause, RefPtr<ReturningClause> returning_clause)
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: m_recursive(recursive)
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, m_common_table_expression(move(common_table_expression))
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, m_qualified_table_name(move(qualified_table_name))
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, m_where_clause(move(where_clause))
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, m_returning_clause(move(returning_clause))
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{
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}
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bool recursive() const { return m_recursive; }
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const RefPtr<CommonTableExpression>& common_table_expression() const { return m_common_table_expression; }
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const NonnullRefPtr<QualifiedTableName>& qualified_table_name() const { return m_qualified_table_name; }
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const RefPtr<Expression>& where_clause() const { return m_where_clause; }
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const RefPtr<ReturningClause>& returning_clause() const { return m_returning_clause; }
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private:
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bool m_recursive;
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RefPtr<CommonTableExpression> m_common_table_expression;
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NonnullRefPtr<QualifiedTableName> m_qualified_table_name;
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RefPtr<Expression> m_where_clause;
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RefPtr<ReturningClause> m_returning_clause;
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};
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}
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@ -37,7 +37,9 @@ class ChainedExpression;
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class CollateExpression;
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class ColumnDefinition;
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class ColumnNameExpression;
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class CommonTableExpression;
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class CreateTable;
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class Delete;
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class DropTable;
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class ErrorExpression;
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class ErrorStatement;
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@ -55,6 +57,8 @@ class NullExpression;
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class NullLiteral;
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class NumericLiteral;
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class Parser;
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class QualifiedTableName;
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class ReturningClause;
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class SignedNumber;
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class Statement;
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class StringLiteral;
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@ -41,8 +41,11 @@ NonnullRefPtr<Statement> Parser::next_statement()
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return parse_create_table_statement();
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case TokenType::Drop:
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return parse_drop_table_statement();
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case TokenType::Delete:
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case TokenType::With:
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return parse_delete_statement();
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default:
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expected("CREATE or DROP");
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expected("CREATE, DROP, or DELETE");
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return create_ast_node<ErrorStatement>();
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}
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}
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@ -125,6 +128,34 @@ NonnullRefPtr<DropTable> Parser::parse_drop_table_statement()
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return create_ast_node<DropTable>(move(schema_name), move(table_name), is_error_if_table_does_not_exist);
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}
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NonnullRefPtr<Delete> Parser::parse_delete_statement()
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{
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// https://sqlite.org/lang_delete.html
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bool recursive = false;
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RefPtr<CommonTableExpression> common_table_expression;
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if (consume_if(TokenType::With)) {
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recursive = consume_if(TokenType::Recursive);
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common_table_expression = parse_common_table_expression();
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}
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consume(TokenType::Delete);
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consume(TokenType::From);
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auto qualified_table_name = parse_qualified_table_name();
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RefPtr<Expression> where_clause;
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if (consume_if(TokenType::Where))
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where_clause = parse_expression();
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RefPtr<ReturningClause> returning_clause;
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if (match(TokenType::Returning))
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returning_clause = parse_returning_clause();
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consume(TokenType::SemiColon);
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return create_ast_node<Delete>(recursive, move(common_table_expression), move(qualified_table_name), move(where_clause), move(returning_clause));
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}
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NonnullRefPtr<Expression> Parser::parse_expression()
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{
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// https://sqlite.org/lang_expr.html
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@ -620,6 +651,87 @@ NonnullRefPtr<SignedNumber> Parser::parse_signed_number()
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return create_ast_node<SignedNumber>(0);
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}
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NonnullRefPtr<CommonTableExpression> Parser::parse_common_table_expression()
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{
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// https://sqlite.org/syntax/common-table-expression.html
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auto table_name = consume(TokenType::Identifier).value();
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Vector<String> column_names;
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if (consume_if(TokenType::ParenOpen)) {
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do {
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column_names.append(consume(TokenType::Identifier).value());
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if (match(TokenType::ParenClose))
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break;
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consume(TokenType::Comma);
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} while (!match(TokenType::Eof));
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consume(TokenType::ParenClose);
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}
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consume(TokenType::As);
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consume(TokenType::ParenOpen);
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// FIXME: Parse "select-stmt".
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consume(TokenType::ParenClose);
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return create_ast_node<CommonTableExpression>(move(table_name), move(column_names));
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}
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NonnullRefPtr<QualifiedTableName> Parser::parse_qualified_table_name()
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{
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// https://sqlite.org/syntax/qualified-table-name.html
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String schema_or_table_name = consume(TokenType::Identifier).value();
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String schema_name;
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String table_name;
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if (consume_if(TokenType::Period)) {
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schema_name = move(schema_or_table_name);
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table_name = consume(TokenType::Identifier).value();
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} else {
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table_name = move(schema_or_table_name);
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}
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String alias;
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if (consume_if(TokenType::As))
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alias = consume(TokenType::Identifier).value();
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// Note: The qualified-table-name spec may include an "INDEXED BY index-name" or "NOT INDEXED" clause. This is a SQLite extension
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// "designed to help detect undesirable query plan changes during regression testing", and "application developers are admonished
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// to omit all use of INDEXED BY during application design, implementation, testing, and tuning". Our implementation purposefully
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// omits parsing INDEXED BY for now until there is good reason to add support.
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return create_ast_node<QualifiedTableName>(move(schema_name), move(table_name), move(alias));
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}
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NonnullRefPtr<ReturningClause> Parser::parse_returning_clause()
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{
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// https://sqlite.org/syntax/returning-clause.html
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consume(TokenType::Returning);
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if (consume_if(TokenType::Asterisk))
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return create_ast_node<ReturningClause>();
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Vector<ReturningClause::ColumnClause> columns;
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do {
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auto expression = parse_expression();
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consume_if(TokenType::As); // 'AS' is optional.
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String column_alias;
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if (match(TokenType::Identifier))
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column_alias = consume().value();
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columns.append({ move(expression), move(column_alias) });
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if (!match(TokenType::Comma))
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break;
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consume(TokenType::Comma);
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} while (!match(TokenType::Eof));
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return create_ast_node<ReturningClause>(move(columns));
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}
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Token Parser::consume()
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{
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auto old_token = m_parser_state.m_token;
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@ -72,6 +72,7 @@ private:
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NonnullRefPtr<CreateTable> parse_create_table_statement();
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NonnullRefPtr<DropTable> parse_drop_table_statement();
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NonnullRefPtr<Delete> parse_delete_statement();
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NonnullRefPtr<Expression> parse_primary_expression();
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NonnullRefPtr<Expression> parse_secondary_expression(NonnullRefPtr<Expression> primary);
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@ -93,6 +94,9 @@ private:
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NonnullRefPtr<ColumnDefinition> parse_column_definition();
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NonnullRefPtr<TypeName> parse_type_name();
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NonnullRefPtr<SignedNumber> parse_signed_number();
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NonnullRefPtr<CommonTableExpression> parse_common_table_expression();
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NonnullRefPtr<QualifiedTableName> parse_qualified_table_name();
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NonnullRefPtr<ReturningClause> parse_returning_clause();
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Token consume();
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Token consume(TokenType type);
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@ -157,4 +157,86 @@ TEST_CASE(drop_table)
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validate("DROP TABLE IF EXISTS test;", {}, "test", false);
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}
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TEST_CASE(delete_)
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{
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EXPECT(parse("DELETE").is_error());
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EXPECT(parse("DELETE FROM").is_error());
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EXPECT(parse("DELETE FROM table").is_error());
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EXPECT(parse("DELETE FROM table WHERE").is_error());
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EXPECT(parse("DELETE FROM table WHERE 15").is_error());
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EXPECT(parse("DELETE FROM table WHERE 15 RETURNING").is_error());
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EXPECT(parse("DELETE FROM table WHERE 15 RETURNING *").is_error());
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EXPECT(parse("DELETE FROM table WHERE (');").is_error());
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EXPECT(parse("WITH DELETE FROM table;").is_error());
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EXPECT(parse("WITH table DELETE FROM table;").is_error());
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EXPECT(parse("WITH table AS DELETE FROM table;").is_error());
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EXPECT(parse("WITH RECURSIVE table DELETE FROM table;").is_error());
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EXPECT(parse("WITH RECURSIVE table AS DELETE FROM table;").is_error());
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struct SelectedTable {
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bool recursive { false };
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StringView table_name {};
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Vector<StringView> column_names {};
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};
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auto validate = [](StringView sql, SelectedTable expected_selected_table, StringView expected_schema, StringView expected_table, StringView expected_alias, bool expect_where_clause, bool expect_returning_clause, Vector<StringView> expected_returned_column_aliases) {
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auto result = parse(sql);
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EXPECT(!result.is_error());
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auto statement = result.release_value();
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EXPECT(is<SQL::Delete>(*statement));
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const auto& delete_ = static_cast<const SQL::Delete&>(*statement);
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EXPECT_EQ(delete_.recursive(), expected_selected_table.recursive);
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const auto& common_table_expression = delete_.common_table_expression();
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EXPECT_EQ(common_table_expression.is_null(), expected_selected_table.table_name.is_empty());
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if (common_table_expression) {
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EXPECT_EQ(common_table_expression->table_name(), expected_selected_table.table_name);
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EXPECT_EQ(common_table_expression->column_names().size(), expected_selected_table.column_names.size());
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for (size_t i = 0; i < common_table_expression->column_names().size(); ++i)
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EXPECT_EQ(common_table_expression->column_names()[i], expected_selected_table.column_names[i]);
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}
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const auto& qualified_table_name = delete_.qualified_table_name();
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EXPECT_EQ(qualified_table_name->schema_name(), expected_schema);
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EXPECT_EQ(qualified_table_name->table_name(), expected_table);
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EXPECT_EQ(qualified_table_name->alias(), expected_alias);
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const auto& where_clause = delete_.where_clause();
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EXPECT_EQ(where_clause.is_null(), !expect_where_clause);
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if (where_clause)
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EXPECT(!is<SQL::ErrorExpression>(*where_clause));
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const auto& returning_clause = delete_.returning_clause();
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EXPECT_EQ(returning_clause.is_null(), !expect_returning_clause);
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if (returning_clause) {
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EXPECT_EQ(returning_clause->columns().size(), expected_returned_column_aliases.size());
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for (size_t i = 0; i < returning_clause->columns().size(); ++i) {
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const auto& column = returning_clause->columns()[i];
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const auto& expected_column_alias = expected_returned_column_aliases[i];
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EXPECT(!is<SQL::ErrorExpression>(*column.expression));
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EXPECT_EQ(column.column_alias, expected_column_alias);
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}
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}
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};
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validate("DELETE FROM table;", {}, {}, "table", {}, false, false, {});
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validate("DELETE FROM schema.table;", {}, "schema", "table", {}, false, false, {});
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validate("DELETE FROM schema.table AS alias;", {}, "schema", "table", "alias", false, false, {});
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validate("DELETE FROM table WHERE (1 == 1);", {}, {}, "table", {}, true, false, {});
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validate("DELETE FROM table RETURNING *;", {}, {}, "table", {}, false, true, {});
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validate("DELETE FROM table RETURNING column;", {}, {}, "table", {}, false, true, { {} });
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validate("DELETE FROM table RETURNING column AS alias;", {}, {}, "table", {}, false, true, { "alias" });
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validate("DELETE FROM table RETURNING column1 AS alias1, column2 AS alias2;", {}, {}, "table", {}, false, true, { "alias1", "alias2" });
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// FIXME: When parsing of SELECT statements are supported, the common-table-expressions below will become invalid due to the empty "AS ()" clause.
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validate("WITH table AS () DELETE FROM table;", { false, "table", {} }, {}, "table", {}, false, false, {});
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validate("WITH table (column) AS () DELETE FROM table;", { false, "table", { "column" } }, {}, "table", {}, false, false, {});
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validate("WITH table (column1, column2) AS () DELETE FROM table;", { false, "table", { "column1", "column2" } }, {}, "table", {}, false, false, {});
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validate("WITH RECURSIVE table AS () DELETE FROM table;", { true, "table", {} }, {}, "table", {}, false, false, {});
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}
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TEST_MAIN(SqlParser)
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