aver/nan_value/
convert.rs

1use super::*;
2use std::collections::HashMap;
3
4use crate::value::Value;
5
6impl NanValue {
7    /// Convert old Value to NanValue, storing heap data in arena.
8    pub fn from_value(val: &Value, arena: &mut Arena) -> Self {
9        match val {
10            Value::Int(i) => NanValue::new_int(*i, arena),
11            Value::Float(f) => NanValue::new_float(*f),
12            Value::Bool(b) => NanValue::new_bool(*b),
13            Value::Unit => NanValue::UNIT,
14            Value::None => NanValue::NONE,
15            Value::Str(s) => NanValue::new_string_value(s, arena),
16            Value::Ok(inner) => {
17                let inner_nv = NanValue::from_value(inner, arena);
18                NanValue::new_ok_value(inner_nv, arena)
19            }
20            Value::Err(inner) => {
21                let inner_nv = NanValue::from_value(inner, arena);
22                NanValue::new_err_value(inner_nv, arena)
23            }
24            Value::Some(inner) => {
25                let inner_nv = NanValue::from_value(inner, arena);
26                NanValue::new_some_value(inner_nv, arena)
27            }
28            Value::Tuple(items) => {
29                let nv_items: Vec<_> = items
30                    .iter()
31                    .map(|v| NanValue::from_value(v, arena))
32                    .collect();
33                NanValue::new_tuple(arena.push_tuple(nv_items))
34            }
35            Value::List(aver_list) => {
36                let items: Vec<_> = aver_list
37                    .to_vec()
38                    .iter()
39                    .map(|v| NanValue::from_value(v, arena))
40                    .collect();
41                if items.is_empty() {
42                    NanValue::EMPTY_LIST
43                } else {
44                    NanValue::new_list(arena.push_list(items))
45                }
46            }
47            Value::Map(map) => {
48                if map.is_empty() {
49                    return NanValue::EMPTY_MAP;
50                }
51                let mut nv_map = PersistentMap::new();
52                for (k, v) in map {
53                    let nk = NanValue::from_value(k, arena);
54                    let nv = NanValue::from_value(v, arena);
55                    nv_map.insert(nk.map_key_hash(arena), (nk, nv));
56                }
57                let idx = arena.push(ArenaEntry::Map(nv_map));
58                NanValue::new_map(idx)
59            }
60            Value::Fn(f) => NanValue::new_fn(arena.push_fn(Rc::clone(f))),
61            Value::Builtin(name) => NanValue::new_builtin(arena.push_builtin(name)),
62            Value::Record { type_name, fields } => {
63                let type_id = arena.find_type_id(type_name).unwrap_or_else(|| {
64                    let field_names: Vec<String> = fields.iter().map(|(n, _)| n.clone()).collect();
65                    arena.register_record_type(type_name, field_names)
66                });
67                let nv_fields: Vec<_> = fields
68                    .iter()
69                    .map(|(_, v)| NanValue::from_value(v, arena))
70                    .collect();
71                NanValue::new_record(arena.push_record(type_id, nv_fields))
72            }
73            Value::Variant {
74                type_name,
75                variant,
76                fields,
77            } => {
78                let type_id = arena
79                    .find_type_id(type_name)
80                    .unwrap_or_else(|| arena.register_sum_type(type_name, vec![variant.clone()]));
81                let variant_id = arena
82                    .find_variant_id(type_id, variant)
83                    .unwrap_or_else(|| arena.register_variant_name(type_id, variant.clone()));
84                let nv_fields: Vec<_> = fields
85                    .iter()
86                    .map(|v| NanValue::from_value(v, arena))
87                    .collect();
88                if nv_fields.is_empty() {
89                    NanValue::new_nullary_variant(arena.push_nullary_variant_symbol(
90                        arena.find_ctor_id(type_id, variant_id).unwrap(),
91                    ))
92                } else {
93                    NanValue::new_variant(arena.push_variant(type_id, variant_id, nv_fields))
94                }
95            }
96            Value::Namespace { name, members } => {
97                let nv_members: Vec<_> = members
98                    .iter()
99                    .map(|(k, v)| (Rc::from(k.as_str()), NanValue::from_value(v, arena)))
100                    .collect();
101                let idx = arena.push(ArenaEntry::Namespace {
102                    name: Rc::from(name.as_str()),
103                    members: nv_members,
104                });
105                NanValue::new_namespace(idx)
106            }
107        }
108    }
109
110    /// Convert NanValue back to old Value (for interop during migration).
111    pub fn to_value(self, arena: &Arena) -> Value {
112        if self.is_float() {
113            return Value::Float(self.as_float());
114        }
115        if let Some((kind, inner)) = self.wrapper_parts(arena) {
116            let inner = inner.to_value(arena);
117            return match kind {
118                WRAP_SOME => Value::Some(Box::new(inner)),
119                WRAP_OK => Value::Ok(Box::new(inner)),
120                WRAP_ERR => Value::Err(Box::new(inner)),
121                _ => Value::Unit,
122            };
123        }
124        if let Some((type_id, variant_id, fields)) = self.variant_parts(arena) {
125            let type_name = arena.get_type_name(type_id).to_string();
126            let variant = arena.get_variant_name(type_id, variant_id).to_string();
127            let vals: Vec<Value> = fields.iter().map(|v| v.to_value(arena)).collect();
128            return Value::Variant {
129                type_name,
130                variant,
131                fields: vals.into(),
132            };
133        }
134        match self.tag() {
135            TAG_INT => Value::Int(self.as_int(arena)),
136            TAG_IMMEDIATE => match self.payload() {
137                IMM_FALSE => Value::Bool(false),
138                IMM_TRUE => Value::Bool(true),
139                IMM_UNIT => Value::Unit,
140                _ => Value::Unit,
141            },
142            TAG_NONE => Value::None,
143            TAG_SOME | TAG_OK | TAG_ERR => {
144                unreachable!("wrapper conversion handled before tag switch")
145            }
146            TAG_STRING => Value::Str(arena.get_string_value(self).to_string()),
147            TAG_LIST => {
148                let vals: Vec<Value> = arena
149                    .list_to_vec_value(self)
150                    .into_iter()
151                    .map(|v| v.to_value(arena))
152                    .collect();
153                Value::List(aver_rt::AverList::from_vec(vals))
154            }
155            TAG_TUPLE => {
156                let items = arena.get_tuple(self.arena_index());
157                Value::Tuple(items.iter().map(|v| v.to_value(arena)).collect())
158            }
159            TAG_MAP => {
160                let map = arena.map_ref_value(self);
161                let mut hm = HashMap::new();
162                for (k, v) in map.values() {
163                    hm.insert(k.to_value(arena), v.to_value(arena));
164                }
165                Value::Map(hm)
166            }
167            TAG_RECORD => {
168                let (type_id, fields) = arena.get_record(self.arena_index());
169                let type_name = arena.get_type_name(type_id).to_string();
170                let field_names = arena.get_field_names(type_id);
171                let pairs: Vec<(String, Value)> = field_names
172                    .iter()
173                    .zip(fields)
174                    .map(|(n, v)| (n.clone(), v.to_value(arena)))
175                    .collect();
176                Value::Record {
177                    type_name,
178                    fields: pairs.into(),
179                }
180            }
181            TAG_VARIANT => {
182                unreachable!("variant conversion handled before tag switch")
183            }
184            TAG_SYMBOL => match self.symbol_kind() {
185                SYMBOL_FN => Value::Fn(Rc::clone(arena.get_fn_rc(self.symbol_index()))),
186                SYMBOL_BUILTIN => {
187                    Value::Builtin(arena.get_builtin(self.symbol_index()).to_string())
188                }
189                SYMBOL_NAMESPACE => {
190                    let (name, members) = arena.get_namespace(self.symbol_index());
191                    let mut hm = HashMap::new();
192                    for (k, v) in members {
193                        hm.insert(k.to_string(), v.to_value(arena));
194                    }
195                    Value::Namespace {
196                        name: name.to_string(),
197                        members: hm,
198                    }
199                }
200                SYMBOL_NULLARY_VARIANT => {
201                    unreachable!("variant conversion handled before tag switch")
202                }
203                _ => Value::Unit,
204            },
205            _ => Value::Unit,
206        }
207    }
208}
aver/nan_value/convert.rs

aver/nan_value/
convert.rs
