blob: 435b8ef6161f052829465e27e508d4804874a411 (
plain)
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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
(;module:
lux
(lux (control monad)
(data [text "text/" Eq<Text>]
text/format
[maybe "maybe/" Monad<Maybe>]
[product]
["e" error]
(coll [list "list/" Functor<List> Fold<List> Monoid<List>]))
[meta])
(luxc ["&" lang]
(lang [";L" variable #+ Variable])))
(type: Locals (Bindings Text [Type Nat]))
(type: Captured (Bindings Text [Type Ref]))
(def: (is-local? name scope)
(-> Text Scope Bool)
(|> scope
(get@ [#;locals #;mappings])
(&;pl-contains? name)))
(def: (get-local name scope)
(-> Text Scope (Maybe [Type Ref]))
(|> scope
(get@ [#;locals #;mappings])
(&;pl-get name)
(maybe/map (function [[type value]]
[type (#;Local value)]))))
(def: (is-captured? name scope)
(-> Text Scope Bool)
(|> scope
(get@ [#;captured #;mappings])
(&;pl-contains? name)))
(def: (get-captured name scope)
(-> Text Scope (Maybe [Type Ref]))
(loop [idx +0
mappings (get@ [#;captured #;mappings] scope)]
(case mappings
#;Nil
#;None
(#;Cons [_name [_source-type _source-ref]] mappings')
(if (text/= name _name)
(#;Some [_source-type (#;Captured idx)])
(recur (n.inc idx) mappings')))))
(def: (is-ref? name scope)
(-> Text Scope Bool)
(or (is-local? name scope)
(is-captured? name scope)))
(def: (get-ref name scope)
(-> Text Scope (Maybe [Type Ref]))
(case (get-local name scope)
(#;Some type)
(#;Some type)
_
(get-captured name scope)))
(def: #export (find name)
(-> Text (Meta (Maybe [Type Ref])))
(function [compiler]
(let [[inner outer] (|> compiler
(get@ #;scopes)
(list;split-with (|>. (is-ref? name) not)))]
(case outer
#;Nil
(#;Right [compiler #;None])
(#;Cons top-outer _)
(let [[ref-type init-ref] (maybe;default (undefined)
(get-ref name top-outer))
[ref inner'] (list/fold (: (-> Scope [Ref (List Scope)] [Ref (List Scope)])
(function [scope ref+inner]
[(#;Captured (get@ [#;captured #;counter] scope))
(#;Cons (update@ #;captured
(: (-> Captured Captured)
(|>. (update@ #;counter n.inc)
(update@ #;mappings (&;pl-put name [ref-type (product;left ref+inner)]))))
scope)
(product;right ref+inner))]))
[init-ref #;Nil]
(list;reverse inner))
scopes (list/compose inner' outer)]
(#;Right [(set@ #;scopes scopes compiler)
(#;Some [ref-type ref])]))
))))
(def: #export (with-local [name type] action)
(All [a] (-> [Text Type] (Meta a) (Meta a)))
(function [compiler]
(case (get@ #;scopes compiler)
(#;Cons head tail)
(let [old-mappings (get@ [#;locals #;mappings] head)
new-var-id (get@ [#;locals #;counter] head)
new-head (update@ #;locals
(: (-> Locals Locals)
(|>. (update@ #;counter n.inc)
(update@ #;mappings (&;pl-put name [type new-var-id]))))
head)]
(case (meta;run' (set@ #;scopes (#;Cons new-head tail) compiler)
action)
(#e;Success [compiler' output])
(case (get@ #;scopes compiler')
(#;Cons head' tail')
(let [scopes' (#;Cons (set@ #;locals (get@ #;locals head) head')
tail')]
(#e;Success [(set@ #;scopes scopes' compiler')
output]))
_
(error! "Invalid scope alteration."))
(#e;Error error)
(#e;Error error)))
_
(#e;Error "Cannot create local binding without a scope."))
))
(do-template [<name> <val-type>]
[(def: <name>
(Bindings Text [Type <val-type>])
{#;counter +0
#;mappings (list)})]
[init-locals Nat]
[init-captured Ref]
)
(def: (scope parent-name child-name)
(-> (List Text) Text Scope)
{#;name (list& child-name parent-name)
#;inner +0
#;locals init-locals
#;captured init-captured})
(def: #export (with-scope name action)
(All [a] (-> Text (Meta a) (Meta a)))
(function [compiler]
(let [parent-name (case (get@ #;scopes compiler)
#;Nil
(list)
(#;Cons top _)
(get@ #;name top))]
(case (action (update@ #;scopes
(|>. (#;Cons (scope parent-name name)))
compiler))
(#e;Error error)
(#e;Error error)
(#e;Success [compiler' output])
(#e;Success [(update@ #;scopes
(|>. list;tail (maybe;default (list)))
compiler')
output])
))
))
(def: #export next-local
(Meta Nat)
(function [compiler]
(case (get@ #;scopes compiler)
#;Nil
(#e;Error "Cannot get next reference when there is no scope.")
(#;Cons top _)
(#e;Success [compiler (get@ [#;locals #;counter] top)]))))
|
