aver/nan_value/
convert.rs

1use super::*;
2use std::collections::HashMap;
3
4use crate::value::Value;
5
6/// Extension trait providing `from_value` / `to_value` conversion between
7/// the runtime `Value` and `NanValue`.  These methods live here
8/// (rather than on `NanValue` directly) because `NanValue` is now defined
9/// in the `aver_memory` crate.
10pub trait NanValueConvert {
11    fn from_value(val: &Value, arena: &mut Arena) -> NanValue;
12    fn to_value(self, arena: &Arena) -> Value;
13}
14
15impl NanValueConvert for NanValue {
16    /// Convert old Value to NanValue, storing heap data in arena.
17    fn from_value(val: &Value, arena: &mut Arena) -> NanValue {
18        match val {
19            Value::Int(i) => NanValue::new_int(*i, arena),
20            Value::Float(f) => NanValue::new_float(*f),
21            Value::Bool(b) => NanValue::new_bool(*b),
22            Value::Unit => NanValue::UNIT,
23            Value::None => NanValue::NONE,
24            Value::Str(s) => NanValue::new_string_value(s, arena),
25            Value::Ok(inner) => {
26                let inner_nv = NanValue::from_value(inner, arena);
27                NanValue::new_ok_value(inner_nv, arena)
28            }
29            Value::Err(inner) => {
30                let inner_nv = NanValue::from_value(inner, arena);
31                NanValue::new_err_value(inner_nv, arena)
32            }
33            Value::Some(inner) => {
34                let inner_nv = NanValue::from_value(inner, arena);
35                NanValue::new_some_value(inner_nv, arena)
36            }
37            Value::Tuple(items) => {
38                let nv_items: Vec<_> = items
39                    .iter()
40                    .map(|v| NanValue::from_value(v, arena))
41                    .collect();
42                NanValue::new_tuple(arena.push_tuple(nv_items))
43            }
44            Value::List(aver_list) => {
45                let items: Vec<_> = aver_list
46                    .to_vec()
47                    .iter()
48                    .map(|v| NanValue::from_value(v, arena))
49                    .collect();
50                if items.is_empty() {
51                    NanValue::EMPTY_LIST
52                } else {
53                    NanValue::new_list(arena.push_list(items))
54                }
55            }
56            Value::Vector(vec) => {
57                let items: Vec<_> = vec.iter().map(|v| NanValue::from_value(v, arena)).collect();
58                if items.is_empty() {
59                    NanValue::EMPTY_VECTOR
60                } else {
61                    NanValue::new_vector(arena.push_vector(items))
62                }
63            }
64            Value::Map(map) => {
65                if map.is_empty() {
66                    return NanValue::EMPTY_MAP;
67                }
68                let mut nv_map = PersistentMap::new();
69                for (k, v) in map {
70                    let nk = NanValue::from_value(k, arena);
71                    let nv = NanValue::from_value(v, arena);
72                    nv_map = nv_map.insert(nk.map_key_hash(arena), (nk, nv));
73                }
74                let idx = arena.push(ArenaEntry::Map(nv_map));
75                NanValue::new_map(idx)
76            }
77            Value::Fn(f) => NanValue::new_fn(arena.push_fn(Rc::clone(f))),
78            Value::Builtin(name) => NanValue::new_builtin(arena.push_builtin(name)),
79            Value::Record { type_name, fields } => {
80                let type_id = arena.find_type_id(type_name).unwrap_or_else(|| {
81                    let field_names: Vec<String> = fields.iter().map(|(n, _)| n.clone()).collect();
82                    arena.register_record_type(type_name, field_names)
83                });
84                let nv_fields: Vec<_> = fields
85                    .iter()
86                    .map(|(_, v)| NanValue::from_value(v, arena))
87                    .collect();
88                NanValue::new_record(arena.push_record(type_id, nv_fields))
89            }
90            Value::Variant {
91                type_name,
92                variant,
93                fields,
94            } => {
95                let type_id = arena
96                    .find_type_id(type_name)
97                    .unwrap_or_else(|| arena.register_sum_type(type_name, vec![variant.clone()]));
98                let variant_id = arena
99                    .find_variant_id(type_id, variant)
100                    .unwrap_or_else(|| arena.register_variant_name(type_id, variant.clone()));
101                let nv_fields: Vec<_> = fields
102                    .iter()
103                    .map(|v| NanValue::from_value(v, arena))
104                    .collect();
105                if nv_fields.is_empty() {
106                    NanValue::new_nullary_variant(arena.push_nullary_variant_symbol(
107                        arena.find_ctor_id(type_id, variant_id).unwrap(),
108                    ))
109                } else if nv_fields.len() == 1 {
110                    if let Some(ctor_id) = arena.find_ctor_id(type_id, variant_id)
111                        && let Some(iv) = NanValue::try_new_inline_variant(ctor_id, nv_fields[0])
112                    {
113                        return iv;
114                    }
115                    NanValue::new_variant(arena.push_variant(type_id, variant_id, nv_fields))
116                } else {
117                    NanValue::new_variant(arena.push_variant(type_id, variant_id, nv_fields))
118                }
119            }
120            Value::Namespace { name, members } => {
121                let nv_members: Vec<_> = members
122                    .iter()
123                    .map(|(k, v)| (Rc::from(k.as_str()), NanValue::from_value(v, arena)))
124                    .collect();
125                let idx = arena.push(ArenaEntry::Namespace {
126                    name: Rc::from(name.as_str()),
127                    members: nv_members,
128                });
129                NanValue::new_namespace(idx)
130            }
131        }
132    }
133
134    /// Convert NanValue back to old Value (for interop during migration).
135    fn to_value(self, arena: &Arena) -> Value {
136        if self.is_float() {
137            return Value::Float(self.as_float());
138        }
139        if let Some((kind, inner)) = self.wrapper_parts(arena) {
140            let inner = inner.to_value(arena);
141            return match kind {
142                WRAP_SOME => Value::Some(Box::new(inner)),
143                WRAP_OK => Value::Ok(Box::new(inner)),
144                WRAP_ERR => Value::Err(Box::new(inner)),
145                _ => Value::Unit,
146            };
147        }
148        if let Some((type_id, variant_id, inner)) = self.inline_variant_info(arena) {
149            let type_name = arena.get_type_name(type_id).to_string();
150            let variant = arena.get_variant_name(type_id, variant_id).to_string();
151            return Value::Variant {
152                type_name,
153                variant,
154                fields: vec![inner.to_value(arena)].into(),
155            };
156        }
157        if let Some((type_id, variant_id, fields)) = self.variant_parts(arena) {
158            let type_name = arena.get_type_name(type_id).to_string();
159            let variant = arena.get_variant_name(type_id, variant_id).to_string();
160            let vals: Vec<Value> = fields.iter().map(|v| v.to_value(arena)).collect();
161            return Value::Variant {
162                type_name,
163                variant,
164                fields: vals.into(),
165            };
166        }
167        match self.tag() {
168            TAG_INT => Value::Int(self.as_int(arena)),
169            TAG_IMMEDIATE => match self.payload() {
170                IMM_FALSE => Value::Bool(false),
171                IMM_TRUE => Value::Bool(true),
172                IMM_UNIT => Value::Unit,
173                _ => Value::Unit,
174            },
175            TAG_NONE => Value::None,
176            TAG_SOME | TAG_OK | TAG_ERR => {
177                unreachable!("wrapper conversion handled before tag switch")
178            }
179            TAG_STRING => Value::Str(arena.get_string_value(self).to_string()),
180            TAG_LIST => {
181                let vals: Vec<Value> = arena
182                    .list_to_vec_value(self)
183                    .into_iter()
184                    .map(|v| v.to_value(arena))
185                    .collect();
186                Value::List(aver_rt::AverList::from_vec(vals))
187            }
188            TAG_VECTOR => {
189                let items = arena.vector_ref_value(self);
190                let vals: Vec<Value> = items.iter().map(|v| v.to_value(arena)).collect();
191                Value::Vector(aver_rt::AverVector::from_vec(vals))
192            }
193            TAG_TUPLE => {
194                let items = arena.get_tuple(self.arena_index());
195                Value::Tuple(items.iter().map(|v| v.to_value(arena)).collect())
196            }
197            TAG_MAP => {
198                let map = arena.map_ref_value(self);
199                let mut hm = HashMap::new();
200                for (k, v) in map.values() {
201                    hm.insert(k.to_value(arena), v.to_value(arena));
202                }
203                Value::Map(hm)
204            }
205            TAG_RECORD => {
206                let (type_id, fields) = arena.get_record(self.arena_index());
207                let type_name = arena.get_type_name(type_id).to_string();
208                let field_names = arena.get_field_names(type_id);
209                let pairs: Vec<(String, Value)> = field_names
210                    .iter()
211                    .zip(fields)
212                    .map(|(n, v)| (n.clone(), v.to_value(arena)))
213                    .collect();
214                Value::Record {
215                    type_name,
216                    fields: pairs.into(),
217                }
218            }
219            TAG_VARIANT | TAG_INLINE_VARIANT => {
220                unreachable!("variant conversion handled before tag switch")
221            }
222            TAG_SYMBOL => match self.symbol_kind() {
223                SYMBOL_FN => Value::Fn(Rc::clone(arena.get_fn_rc(self.symbol_index()))),
224                SYMBOL_BUILTIN => {
225                    Value::Builtin(arena.get_builtin(self.symbol_index()).to_string())
226                }
227                SYMBOL_NAMESPACE => {
228                    let (name, members) = arena.get_namespace(self.symbol_index());
229                    let mut hm = HashMap::new();
230                    for (k, v) in members {
231                        hm.insert(k.to_string(), v.to_value(arena));
232                    }
233                    Value::Namespace {
234                        name: name.to_string(),
235                        members: hm,
236                    }
237                }
238                SYMBOL_NULLARY_VARIANT => {
239                    unreachable!("variant conversion handled before tag switch")
240                }
241                _ => Value::Unit,
242            },
243            _ => Value::Unit,
244        }
245    }
246}
aver/nan_value/convert.rs

aver/nan_value/
convert.rs
