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

use core::fmt::{Display, Formatter, Result};
use melodium_common::descriptor::{
    Attribuable, Attributes, DataType, DescribedType, Documented, Function as FunctionDescriptor,
    Generic, Generics, Identified, Identifier, OrderedParameterized, Parameter,
};
use melodium_common::executive::Value;
use std::collections::HashMap;
use std::sync::{Arc, Weak};

#[derive(Debug)]
pub struct Function {
    identifier: Identifier,
    #[cfg(feature = "doc")]
    documentation: String,
    attributes: Attributes,
    generics: Vec<Generic>,
    parameters: Vec<Parameter>,
    return_type: DescribedType,
    function: fn(HashMap<String, DataType>, Vec<Value>) -> Value,
    auto_reference: Weak<Self>,
}

impl Function {
    pub fn new(
        identifier: Identifier,
        documentation: String,
        attributes: Attributes,
        generics: Vec<Generic>,
        parameters: Vec<Parameter>,
        return_type: DescribedType,
        function: fn(HashMap<String, DataType>, Vec<Value>) -> Value,
    ) -> Arc<Self> {
        #[cfg(not(feature = "doc"))]
        let _ = documentation;
        Arc::new_cyclic(|me| Self {
            identifier,
            #[cfg(feature = "doc")]
            documentation,
            attributes,
            generics,
            parameters,
            return_type,
            function,
            auto_reference: me.clone(),
        })
    }
}

impl Attribuable for Function {
    fn attributes(&self) -> &Attributes {
        &self.attributes
    }
}

impl FunctionDescriptor for Function {
    fn return_type(&self) -> &DescribedType {
        &self.return_type
    }

    fn function(&self) -> fn(HashMap<String, DataType>, Vec<Value>) -> Value {
        self.function
    }

    fn as_identified(&self) -> Arc<dyn Identified> {
        self.auto_reference.upgrade().unwrap()
    }

    fn as_ordered_parameterized(&self) -> Arc<dyn OrderedParameterized> {
        self.auto_reference.upgrade().unwrap()
    }
}

impl Identified for Function {
    fn identifier(&self) -> &Identifier {
        &self.identifier
    }
}

impl Documented for Function {
    fn documentation(&self) -> &str {
        #[cfg(feature = "doc")]
        {
            &self.documentation
        }
        #[cfg(not(feature = "doc"))]
        {
            &""
        }
    }
}

impl OrderedParameterized for Function {
    fn parameters(&self) -> &Vec<Parameter> {
        &self.parameters
    }

    fn as_identified(&self) -> Arc<dyn Identified> {
        self.auto_reference.upgrade().unwrap()
    }
}

impl Generics for Function {
    fn generics(&self) -> &Vec<Generic> {
        &self.generics
    }
}

impl Display for Function {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
        write!(
            f,
            "function {}({})",
            self.identifier.to_string(),
            self.parameters()
                .iter()
                .map(|p| p.to_string())
                .collect::<Vec<_>>()
                .join(", "),
        )?;

        Ok(())
    }
}