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// Copyright 2021 Datafuse Labs
//
// 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 std::fmt::Display;
use std::fmt::Formatter;
use derive_visitor::Drive;
use derive_visitor::DriveMut;
use crate::ast::Identifier;
use crate::ast::SetType;
use crate::ast::SetValues;
#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub struct Settings {
pub set_type: SetType,
pub identifiers: Vec<Identifier>,
pub values: SetValues,
}
impl Display for Settings {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self.set_type {
SetType::SettingsGlobal => write!(f, "GLOBAL ")?,
SetType::SettingsSession => write!(f, "SESSION ")?,
SetType::Variable => write!(f, "VARIABLE ")?,
SetType::SettingsQuery => write!(f, "")?,
}
if self.identifiers.len() > 1 {
write!(f, "(")?;
}
for (idx, variable) in self.identifiers.iter().enumerate() {
if idx > 0 {
write!(f, ", ")?;
}
write!(f, "{variable}")?;
}
if self.identifiers.len() > 1 {
write!(f, ")")?;
}
match &self.values {
SetValues::Expr(exprs) => {
write!(f, " = ")?;
if exprs.len() > 1 {
write!(f, "(")?;
}
for (idx, value) in exprs.iter().enumerate() {
if idx > 0 {
write!(f, ", ")?;
}
write!(f, "{value}")?;
}
if exprs.len() > 1 {
write!(f, ")")?;
}
}
SetValues::Query(query) => {
write!(f, " = {query}")?;
}
SetValues::None => {}
}
Ok(())
}
}