stof 0.9.19

Data that carries its own logic.
Documentation 
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

//
// Copyright 2025 Formata, Inc. All rights reserved.
//
// 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::{ops::{Deref, DerefMut}, sync::Arc};
use lazy_static::lazy_static;
use serde::{Deserialize, Serialize};
use crate::{model::Graph, runtime::{instruction::{Instruction, Instructions}, proc::ProcEnv, Error, Num, Val, Variable}};


lazy_static! {
    pub static ref NEW_TUP: Arc<dyn Instruction> = Arc::new(TupIns::NewTup);
    pub static ref PUSH_TUP: Arc<dyn Instruction> = Arc::new(TupIns::PushTup);

    pub static ref LEN_TUP: Arc<dyn Instruction> = Arc::new(TupIns::Len);
    pub static ref AT_TUP: Arc<dyn Instruction> = Arc::new(TupIns::At);
    pub static ref AT_REF_TUP: Arc<dyn Instruction> = Arc::new(TupIns::AtRef);
}


#[derive(Debug, Clone, Serialize, Deserialize)]
/// Tuple creation instructions.
pub enum TupIns {
    // Low-level for construction
    NewTup,
    PushTup,

    // High-level
    AppendTup(Arc<dyn Instruction>), // evaluate and add to the stack (push)

    // Library
    Len,
    At,
    AtRef,
}
#[typetag::serde(name = "TupIns")]
impl Instruction for TupIns {
    fn exec(&self, env: &mut ProcEnv, _graph: &mut Graph) -> Result<Option<Instructions>, Error> {
        match self {
            Self::NewTup => {
                env.stack.push(Variable::val(Val::Tup(Default::default())));
                Ok(None)
            },
            Self::PushTup => {
                if let Some(push_var) = env.stack.pop() {
                    if let Some(tup_var) = env.stack.pop() {
                        {
                            let mut val = tup_var.val.write();
                            let val = val.deref_mut();
                            match &mut *val {
                                Val::Tup(values) => {
                                    values.push_back(push_var.val);
                                },
                                _ => {}
                            }
                        }
                        env.stack.push(tup_var);
                    }
                }
                Ok(None)
            },

            /*****************************************************************************
             * High-level.
             *****************************************************************************/
            Self::AppendTup(ins) => {
                let mut instructions = Instructions::default();
                instructions.push(ins.clone());
                instructions.push(PUSH_TUP.clone());
                Ok(Some(instructions))
            },

            /*****************************************************************************
             * Library.
             *****************************************************************************/
            Self::Len => {
                if let Some(var) = env.stack.pop() {
                    match var.val.read().deref() {
                        Val::Tup(tup) => {
                            env.stack.push(Variable::val(Val::Num(Num::Int(tup.len() as i64))));
                            return Ok(None);
                        },
                        _ => {}
                    }
                }
                Err(Error::TupLen)
            },
            Self::At => {
                if let Some(index_var) = env.stack.pop() {
                    if let Some(var) = env.stack.pop() {
                        match index_var.val.read().deref() {
                            Val::Num(num) => {
                                match var.val.read().deref() {
                                    Val::Tup(tup) => {
                                        if let Some(val) = tup.get(num.int() as usize) {
                                            env.stack.push(Variable::refval(val.duplicate(false)));
                                        } else {
                                            env.stack.push(Variable::val(Val::Null));
                                        }
                                        return Ok(None);
                                    },
                                    _ => {}
                                }
                            },
                            _ => {},
                        }
                    }
                }
                Err(Error::TupAt)
            },
            Self::AtRef => {
                if let Some(index_var) = env.stack.pop() {
                    if let Some(var) = env.stack.pop() {
                        match index_var.val.read().deref() {
                            Val::Num(num) => {
                                match var.val.read().deref() {
                                    Val::Tup(tup) => {
                                        if let Some(val) = tup.get(num.int() as usize) {
                                            env.stack.push(Variable::refval(val.duplicate(true)));
                                        } else {
                                            env.stack.push(Variable::val(Val::Null));
                                        }
                                        return Ok(None);
                                    },
                                    _ => {}
                                }
                            },
                            _ => {},
                        }
                    }
                }
                Err(Error::TupAt)
            },
        }
    }
}