sqlparser/dialect/
ansi.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use crate::dialect::Dialect;
19
20/// A [`Dialect`] for [ANSI SQL](https://en.wikipedia.org/wiki/SQL:2011).
21#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
22#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
23pub struct AnsiDialect {}
24
25impl Dialect for AnsiDialect {
26    /// The SQL standard uses double quotes for delimited identifiers.
27    fn identifier_quote_style(&self, _identifier: &str) -> Option<char> {
28        Some('"')
29    }
30
31    fn is_identifier_start(&self, ch: char) -> bool {
32        ch.is_ascii_lowercase() || ch.is_ascii_uppercase()
33    }
34
35    fn is_identifier_part(&self, ch: char) -> bool {
36        ch.is_ascii_lowercase() || ch.is_ascii_uppercase() || ch.is_ascii_digit() || ch == '_'
37    }
38
39    fn require_interval_qualifier(&self) -> bool {
40        true
41    }
42
43    /// The SQL standard explicitly states that block comments nest.
44    fn supports_nested_comments(&self) -> bool {
45        true
46    }
47}
sqlparser/dialect/ansi.rs

sqlparser/dialect/
ansi.rs
