sqlparser 0.58.0

Extensible SQL Lexer and Parser with support for ANSI SQL:2011
Documentation 
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

//! Key-value options for SQL statements.
//! See [this page](https://docs.snowflake.com/en/sql-reference/commands-data-loading) for more details.

#[cfg(not(feature = "std"))]
use alloc::string::String;
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
use core::fmt;
use core::fmt::Formatter;

#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};

#[cfg(feature = "visitor")]
use sqlparser_derive::{Visit, VisitMut};

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
pub struct KeyValueOptions {
    pub options: Vec<KeyValueOption>,
}

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
pub enum KeyValueOptionType {
    STRING,
    BOOLEAN,
    ENUM,
    NUMBER,
}

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
pub struct KeyValueOption {
    pub option_name: String,
    pub option_type: KeyValueOptionType,
    pub value: String,
}

impl fmt::Display for KeyValueOptions {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        if !self.options.is_empty() {
            let mut first = false;
            for option in &self.options {
                if !first {
                    first = true;
                } else {
                    f.write_str(" ")?;
                }
                write!(f, "{option}")?;
            }
        }
        Ok(())
    }
}

impl fmt::Display for KeyValueOption {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self.option_type {
            KeyValueOptionType::STRING => {
                write!(f, "{}='{}'", self.option_name, self.value)?;
            }
            KeyValueOptionType::ENUM | KeyValueOptionType::BOOLEAN | KeyValueOptionType::NUMBER => {
                write!(f, "{}={}", self.option_name, self.value)?;
            }
        }
        Ok(())
    }
}