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mod.rs
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mod.rs
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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.
mod ansi;
mod bigquery;
mod clickhouse;
mod generic;
mod hive;
mod mssql;
mod mysql;
mod postgresql;
mod redshift;
mod snowflake;
mod sqlite;
use core::any::{Any, TypeId};
use core::fmt::Debug;
use core::iter::Peekable;
use core::str::Chars;
pub use self::ansi::AnsiDialect;
pub use self::bigquery::BigQueryDialect;
pub use self::clickhouse::ClickHouseDialect;
pub use self::generic::GenericDialect;
pub use self::hive::HiveDialect;
pub use self::mssql::MsSqlDialect;
pub use self::mysql::MySqlDialect;
pub use self::postgresql::PostgreSqlDialect;
pub use self::redshift::RedshiftSqlDialect;
pub use self::snowflake::SnowflakeDialect;
pub use self::sqlite::SQLiteDialect;
pub use crate::keywords;
/// `dialect_of!(parser is SQLiteDialect | GenericDialect)` evaluates
/// to `true` if `parser.dialect` is one of the `Dialect`s specified.
macro_rules! dialect_of {
( $parsed_dialect: ident is $($dialect_type: ty)|+ ) => {
($($parsed_dialect.dialect.is::<$dialect_type>())||+)
};
}
pub trait Dialect: Debug + Any {
/// Determine if a character starts a quoted identifier. The default
/// implementation, accepting "double quoted" ids is both ANSI-compliant
/// and appropriate for most dialects (with the notable exception of
/// MySQL, MS SQL, and sqlite). You can accept one of characters listed
/// in `Word::matching_end_quote` here
fn is_delimited_identifier_start(&self, ch: char) -> bool {
ch == '"'
}
/// Determine if quoted characters are proper for identifier
fn is_proper_identifier_inside_quotes(&self, mut _chars: Peekable<Chars<'_>>) -> bool {
true
}
/// Determine if a character is a valid start character for an unquoted identifier
fn is_identifier_start(&self, ch: char) -> bool;
/// Determine if a character is a valid unquoted identifier character
fn is_identifier_part(&self, ch: char) -> bool;
}
impl dyn Dialect {
#[inline]
pub fn is<T: Dialect>(&self) -> bool {
// borrowed from `Any` implementation
TypeId::of::<T>() == self.type_id()
}
}
#[cfg(test)]
mod tests {
use super::ansi::AnsiDialect;
use super::generic::GenericDialect;
use super::*;
struct DialectHolder<'a> {
dialect: &'a dyn Dialect,
}
#[test]
fn test_is_dialect() {
let generic_dialect: &dyn Dialect = &GenericDialect {};
let ansi_dialect: &dyn Dialect = &AnsiDialect {};
let generic_holder = DialectHolder {
dialect: generic_dialect,
};
let ansi_holder = DialectHolder {
dialect: ansi_dialect,
};
assert!(dialect_of!(generic_holder is GenericDialect | AnsiDialect),);
assert!(!dialect_of!(generic_holder is AnsiDialect));
assert!(dialect_of!(ansi_holder is AnsiDialect));
assert!(dialect_of!(ansi_holder is GenericDialect | AnsiDialect));
assert!(!dialect_of!(ansi_holder is GenericDialect | MsSqlDialect));
}
}