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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

use lazy_static::lazy_static;
use std::sync::Mutex;

use crate::chunk::ModuleChunk;
use crate::value::Value::*;
use crate::value::{HeapObjVal, Value};
use crate::vm::{VMState, VM};
use std::collections::HashMap;

/// Format: self, args, vm, vm_state, modules, if it returns none, this function doesnt support the type
/// Note: self is not mutable, because its the Pointer to the object, or a "primitive" value
pub type NativeMethod =
    fn(Value, Vec<Value>, &VM, &mut VMState, &[ModuleChunk]) -> Option<Result<Value, String>>;

lazy_static! {
    /// Format: name, (arity, function) if arity is None, the function is variadic
    pub static ref NATIVE_METHODS: Mutex<HashMap<&'static str, (Option<usize>, NativeMethod)>> =
        Mutex::new(HashMap::from([
            (
                "to_string",
                (Some(0), to_string as NativeMethod)
            ),
            (
                "type",
                (Some(0), |this,_,_,_,_| {
                    Some(Ok(PhoenixString(this.get_type().to_string())))
                })
            ),
            (
                "push",
                (Some(1), |this, args, vm, state, modules| {
                    // prepare a string in case we need it
                    let push_string = &args[0].to_string(vm, state, &modules.to_vec());
                    match this {
                        PhoenixPointer(ptr) => {
                            let obj = state.deref_mut(ptr);
                            match obj.obj {
                                HeapObjVal::PhoenixList(ref mut list) => {
                                    list.values.push(args[0].clone());
                                    Some(Ok(Nil))
                                }
                                HeapObjVal::PhoenixString(ref mut string) => {
                                    string.value.push_str(push_string);
                                    Some(Ok(Nil))
                                }
                                _ => None
                            }
                        }
                        _ => None
                    }
                })
            ),
            (
                "pop",
                (Some(0), |this,_,_,state,_| {
                    match this {
                        PhoenixPointer(ptr) => {
                            let obj = state.deref_mut(ptr);
                            match obj.obj {
                                HeapObjVal::PhoenixList(ref mut list) => {
                                    Some(Ok(list.values.pop().unwrap_or(Nil)))
                                }
                                HeapObjVal::PhoenixString(ref mut string) => {
                                    Some(Ok(PhoenixString(string.value.pop().unwrap_or('\0').to_string())))
                                }
                                _ => None
                            }
                        }
                        _ => None
                    }
                })
            ),
            (
                "len",
                (Some(0), |this,_,_,state,_| {
                    match this {
                        PhoenixPointer(ptr) => {
                            let obj = state.deref_mut(ptr);
                            match obj.obj {
                                HeapObjVal::PhoenixList(ref mut list) => {
                                    Some(Ok(Long(list.values.len() as i64)))
                                }
                                HeapObjVal::PhoenixString(ref mut string) => {
                                    Some(Ok(Long(string.value.len() as i64)))
                                }
                                HeapObjVal::PhoenixHashMap(ref mut hashmap) => {
                                    Some(Ok(Long(hashmap.map.len() as i64)))
                                }
                                _ => None
                            }
                        }
                        _ => None
                    }
                })
            ),
            (
                "sort",
                (Some(0), |this,_,_,state,_| {
                    match this {
                        PhoenixPointer(ptr) => {
                            let obj = state.deref_mut(ptr);
                            match obj.obj {
                                HeapObjVal::PhoenixList(ref mut list) => {
                                    list.values.sort_by(|a, b| {
                                        if let Value::Float(a) = a {
                                            if let Value::Float(b) = b {
                                                return a.partial_cmp(b).unwrap();
                                            }
                                        }
                                        if let Value::Long(a) = a {
                                            if let Value::Long(b) = b {
                                                return a.partial_cmp(b).unwrap();
                                            }
                                        }
                                        panic!("Attempted to sort a list with non-numeric values");
                                    });
                                    Some(Ok(Nil))
                                }
                                _ => None
                            }
                        }
                        _ => None
                    }
                })
            ),
            (
                "get",
                (Some(1), |this,args,_,state,_| {
                    match this {
                        PhoenixPointer(ptr) => {
                            let obj = state.deref_mut(ptr);
                            match obj.obj {
                                HeapObjVal::PhoenixHashMap(ref mut map) => {
                                    println!("{:?}, arg: {:?}", map.map, args);
                                    Some(Ok(map.map.get(&args[0]).unwrap_or(&Nil).clone()))
                                }
                                _ => None
                            }
                        }
                        _ => None
                    }
                })
            ),
        ]));
}

fn to_string(
    this: Value,
    _args: Vec<Value>,
    vm: &VM,
    state: &mut VMState,
    modules: &[ModuleChunk],
) -> Option<Result<Value, String>> {
    Some(Ok(PhoenixString(this.to_string(
        vm,
        state,
        &modules.to_vec(),
    ))))
}