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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::ast::Statement;
use crate::dialect::Dialect;
use crate::keywords::Keyword;
use crate::parser::{Parser, ParserError};
/// A [`Dialect`] for [SQLite](https://www.sqlite.org)
///
/// This dialect allows columns in a
/// [`CREATE TABLE`](https://sqlite.org/lang_createtable.html) statement with no
/// type specified, as in `CREATE TABLE t1 (a)`. In the AST, these columns will
/// have the data type [`Unspecified`](crate::ast::DataType::Unspecified).
#[derive(Debug)]
pub struct SQLiteDialect {}
impl Dialect for SQLiteDialect {
// see https://www.sqlite.org/lang_keywords.html
// parse `...`, [...] and "..." as identifier
// TODO: support depending on the context tread '...' as identifier too.
fn is_delimited_identifier_start(&self, ch: char) -> bool {
ch == '`' || ch == '"' || ch == '['
}
fn identifier_quote_style(&self, _identifier: &str) -> Option<char> {
Some('`')
}
fn is_identifier_start(&self, ch: char) -> bool {
// See https://www.sqlite.org/draft/tokenreq.html
ch.is_ascii_lowercase()
|| ch.is_ascii_uppercase()
|| ch == '_'
|| ('\u{007f}'..='\u{ffff}').contains(&ch)
}
fn supports_filter_during_aggregation(&self) -> bool {
true
}
fn supports_start_transaction_modifier(&self) -> bool {
true
}
fn is_identifier_part(&self, ch: char) -> bool {
self.is_identifier_start(ch) || ch.is_ascii_digit()
}
fn parse_statement(&self, parser: &mut Parser) -> Option<Result<Statement, ParserError>> {
if parser.parse_keyword(Keyword::REPLACE) {
parser.prev_token();
Some(parser.parse_insert())
} else {
None
}
}
fn supports_in_empty_list(&self) -> bool {
true
}
}