1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138

// 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::write_comma_separated_list;
use crate::ast::CreateOption;
use crate::ast::Expr;
use crate::ast::Identifier;
use crate::ast::TypeName;

#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub enum UDFDefinition {
    LambdaUDF {
        parameters: Vec<Identifier>,
        definition: Box<Expr>,
    },
    UDFServer {
        arg_types: Vec<TypeName>,
        return_type: TypeName,
        address: String,
        handler: String,
        language: String,
    },

    UDFScript {
        arg_types: Vec<TypeName>,
        return_type: TypeName,
        code: String,
        handler: String,
        language: String,
        runtime_version: String,
    },
}

impl Display for UDFDefinition {
    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
        match self {
            UDFDefinition::LambdaUDF {
                parameters,
                definition,
            } => {
                write!(f, "AS (")?;
                write_comma_separated_list(f, parameters)?;
                write!(f, ") -> {definition}")?;
            }
            UDFDefinition::UDFServer {
                arg_types,
                return_type,
                address,
                handler,
                language,
            } => {
                write!(f, "(")?;
                write_comma_separated_list(f, arg_types)?;
                write!(
                    f,
                    ") RETURNS {return_type} LANGUAGE {language} HANDLER = '{handler}' ADDRESS = '{address}'"
                )?;
            }
            UDFDefinition::UDFScript {
                arg_types,
                return_type,
                code,
                handler,
                language,
                runtime_version: _,
            } => {
                write!(f, "(")?;
                write_comma_separated_list(f, arg_types)?;
                write!(
                    f,
                    ") RETURNS {return_type} LANGUAGE {language} HANDLER = '{handler}' AS $$\n{code}\n$$"
                )?;
            }
        }
        Ok(())
    }
}

#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub struct CreateUDFStmt {
    pub create_option: CreateOption,
    pub udf_name: Identifier,
    pub description: Option<String>,
    pub definition: UDFDefinition,
}

impl Display for CreateUDFStmt {
    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
        write!(f, "CREATE")?;
        if let CreateOption::CreateOrReplace = self.create_option {
            write!(f, " OR REPLACE")?;
        }
        write!(f, " FUNCTION")?;
        if let CreateOption::CreateIfNotExists = self.create_option {
            write!(f, " IF NOT EXISTS")?;
        }
        write!(f, " {} {}", self.udf_name, self.definition)?;
        if let Some(description) = &self.description {
            write!(f, " DESC = '{description}'")?;
        }
        Ok(())
    }
}

#[derive(Debug, Clone, PartialEq, Drive, DriveMut)]
pub struct AlterUDFStmt {
    pub udf_name: Identifier,
    pub description: Option<String>,
    pub definition: UDFDefinition,
}

impl Display for AlterUDFStmt {
    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
        write!(f, "ALTER FUNCTION")?;
        write!(f, " {} {}", self.udf_name, self.definition)?;
        if let Some(description) = &self.description {
            write!(f, " DESC = '{description}'")?;
        }
        Ok(())
    }
}