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ee7cd585 JM |
1 | Imports System |
2 | Imports System.IO | |
3 | Imports System.Collections.Generic | |
4 | Imports Mal | |
5 | Imports MalVal = Mal.types.MalVal | |
6 | Imports MalInt = Mal.types.MalInt | |
7 | Imports MalString = Mal.types.MalString | |
8 | Imports MalSymbol = Mal.types.MalSymbol | |
9 | Imports MalList = Mal.types.MalList | |
10 | Imports MalVector = Mal.types.MalVector | |
11 | Imports MalHashMap = Mal.types.MalHashMap | |
12 | Imports MalFunc = Mal.types.MalFunc | |
13 | Imports MalEnv = Mal.env.Env | |
14 | ||
15 | Namespace Mal | |
aaba2493 | 16 | Class step7_quote |
ee7cd585 JM |
17 | ' read |
18 | Shared Function READ(str As String) As MalVal | |
19 | Return reader.read_str(str) | |
20 | End Function | |
21 | ||
22 | ' eval | |
23 | Shared Function is_pair(x As MalVal) As Boolean | |
24 | return TypeOf x Is MalList AndAlso _ | |
25 | DirectCast(x,MalList).size() > 0 | |
26 | End Function | |
27 | ||
28 | Shared Function quasiquote(ast As MalVal) As MalVal | |
29 | If not is_pair(ast) Then | |
30 | return New MalList(New MalSymbol("quote"), ast) | |
31 | Else | |
32 | Dim a0 As MalVal = DirectCast(ast,MalList)(0) | |
33 | If TypeOf a0 Is MalSymbol AndAlso _ | |
34 | DirectCast(a0,MalSymbol).getName() = "unquote" Then | |
35 | return DirectCast(ast,MalList)(1) | |
36 | Else If is_pair(a0) Then | |
37 | Dim a00 As MalVal = DirectCast(a0,MalList)(0) | |
38 | If TypeOf a00 is MalSymbol AndAlso _ | |
39 | DirectCast(a00,MalSymbol).getName() = "splice-unquote" Then | |
40 | return New MalList(New MalSymbol("concat"), | |
41 | DirectCast(a0,MalList)(1), | |
42 | quasiquote(DirectCast(ast,MalList).rest())) | |
43 | End If | |
44 | End If | |
45 | return New MalList(New MalSymbol("cons"), | |
46 | quasiquote(a0), | |
47 | quasiquote(DirectCast(ast,MalList).rest())) | |
48 | End If | |
49 | End Function | |
50 | ||
51 | ||
52 | Shared Function eval_ast(ast As MalVal, env As MalEnv) As MalVal | |
53 | If TypeOf ast Is MalSymbol Then | |
b8ee29b2 | 54 | return env.do_get(DirectCast(ast, MalSymbol)) |
ee7cd585 JM |
55 | Else If TypeOf ast Is MalList Then |
56 | Dim old_lst As MalList = DirectCast(ast, MalList) | |
57 | Dim new_lst As MalList | |
58 | If ast.list_Q() Then | |
59 | new_lst = New MalList | |
60 | Else | |
61 | new_lst = DirectCast(New MalVector, MalList) | |
62 | End If | |
63 | Dim mv As MalVal | |
64 | For Each mv in old_lst.getValue() | |
65 | new_lst.conj_BANG(EVAL(mv, env)) | |
66 | Next | |
67 | return new_lst | |
68 | Else If TypeOf ast Is MalHashMap Then | |
69 | Dim new_dict As New Dictionary(Of String, MalVal) | |
70 | Dim entry As KeyValuePair(Of String, MalVal) | |
71 | For Each entry in DirectCast(ast,MalHashMap).getValue() | |
72 | new_dict.Add(entry.Key, EVAL(DirectCast(entry.Value,MalVal), env)) | |
73 | Next | |
74 | return New MalHashMap(new_dict) | |
75 | Else | |
76 | return ast | |
77 | End If | |
78 | return ast | |
79 | End Function | |
80 | ||
81 | ' TODO: move to types.vb when it is ported | |
82 | Class FClosure | |
83 | Public ast As MalVal | |
84 | Public params As MalList | |
85 | Public env As MalEnv | |
86 | Function fn(args as MalList) As MalVal | |
87 | return EVAL(ast, new MalEnv(env, params, args)) | |
88 | End Function | |
89 | End Class | |
90 | ||
91 | Shared Function EVAL(orig_ast As MalVal, env As MalEnv) As MalVal | |
92 | Do | |
93 | ||
94 | 'Console.WriteLine("EVAL: {0}", printer._pr_str(orig_ast, true)) | |
95 | If not orig_ast.list_Q() Then | |
96 | return eval_ast(orig_ast, env) | |
97 | End If | |
98 | ||
99 | ' apply list | |
100 | Dim ast As MalList = DirectCast(orig_ast, MalList) | |
101 | If ast.size() = 0 Then | |
102 | return ast | |
103 | End If | |
104 | Dim a0 As MalVal = ast(0) | |
105 | Dim a0sym As String | |
106 | If TypeOf a0 is MalSymbol Then | |
107 | a0sym = DirectCast(a0,MalSymbol).getName() | |
108 | Else | |
109 | a0sym = "__<*fn*>__" | |
110 | End If | |
111 | ||
112 | Select a0sym | |
113 | Case "def!" | |
114 | Dim a1 As MalVal = ast(1) | |
115 | Dim a2 As MalVal = ast(2) | |
116 | Dim res As MalVal = EVAL(a2, env) | |
b8ee29b2 | 117 | env.do_set(DirectCast(a1,MalSymbol), res) |
ee7cd585 JM |
118 | return res |
119 | Case "let*" | |
120 | Dim a1 As MalVal = ast(1) | |
121 | Dim a2 As MalVal = ast(2) | |
122 | Dim key As MalSymbol | |
123 | Dim val as MalVal | |
124 | Dim let_env As new MalEnv(env) | |
125 | For i As Integer = 0 To (DirectCast(a1,MalList)).size()-1 Step 2 | |
126 | key = DirectCast(DirectCast(a1,MalList)(i),MalSymbol) | |
127 | val = DirectCast(a1,MalList)(i+1) | |
b8ee29b2 | 128 | let_env.do_set(key, EVAL(val, let_env)) |
ee7cd585 JM |
129 | Next |
130 | orig_ast = a2 | |
131 | env = let_env | |
132 | Case "quote" | |
133 | return ast(1) | |
134 | Case "quasiquote" | |
135 | orig_ast = quasiquote(ast(1)) | |
136 | Case "do" | |
137 | eval_ast(ast.slice(1, ast.size()-1), env) | |
138 | orig_ast = ast(ast.size()-1) | |
139 | Case "if" | |
140 | Dim a1 As MalVal = ast(1) | |
141 | Dim cond As MalVal = EVAL(a1, env) | |
142 | If cond Is Mal.types.Nil or cond Is Mal.types.MalFalse Then | |
143 | ' eval false slot form | |
144 | If ast.size() > 3 Then | |
145 | orig_ast = ast(3) | |
146 | Else | |
147 | return Mal.types.Nil | |
148 | End If | |
149 | Else | |
150 | ' eval true slot form | |
151 | orig_ast = ast(2) | |
152 | ||
153 | End If | |
154 | Case "fn*" | |
155 | Dim fc As New FClosure() | |
156 | fc.ast = ast(2) | |
157 | fc.params = DirectCast(ast(1),MalLIst) | |
158 | fc.env = env | |
159 | Dim f As Func(Of MalList, MalVal) = AddressOf fc.fn | |
160 | Dim mf As new MalFunc(ast(2), env, | |
161 | DirectCast(ast(1),MalList), f) | |
162 | return DirectCast(mf,MalVal) | |
163 | Case Else | |
164 | Dim el As MalList = DirectCast(eval_ast(ast, env), MalList) | |
165 | Dim f As MalFunc = DirectCast(el(0), MalFunc) | |
166 | Dim fnast As MalVal = f.getAst() | |
167 | If not fnast Is Nothing | |
168 | orig_ast = fnast | |
169 | env = f.genEnv(el.rest()) | |
170 | Else | |
171 | Return f.apply(el.rest()) | |
172 | End If | |
173 | End Select | |
174 | ||
175 | Loop While True | |
176 | End Function | |
177 | ||
178 | ||
179 | Shared Function PRINT(exp As MalVal) As String | |
180 | return printer._pr_str(exp, TRUE) | |
181 | End Function | |
182 | ||
183 | ' repl | |
184 | Shared repl_env As MalEnv | |
185 | ||
186 | Shared Function REP(str As String) As String | |
187 | Return PRINT(EVAL(READ(str), repl_env)) | |
188 | End Function | |
189 | ||
190 | Shared Function do_eval(args As MalList) As MalVal | |
191 | Return EVAL(args(0), repl_env) | |
192 | End Function | |
193 | ||
194 | Shared Function Main As Integer | |
195 | Dim args As String() = Environment.GetCommandLineArgs() | |
196 | ||
197 | repl_env = New MalEnv(Nothing) | |
198 | ||
199 | ' core.vb: defined using VB.NET | |
200 | For Each entry As KeyValuePair(Of String,MalVal) In core.ns() | |
b8ee29b2 | 201 | repl_env.do_set(new MalSymbol(entry.Key), entry.Value) |
ee7cd585 | 202 | Next |
b8ee29b2 | 203 | repl_env.do_set(new MalSymbol("eval"), new MalFunc(AddressOf do_eval)) |
aaba2493 JM |
204 | Dim fileIdx As Integer = 1 |
205 | If args.Length > 1 AndAlso args(1) = "--raw" Then | |
206 | Mal.readline.SetMode(Mal.readline.Modes.Raw) | |
207 | fileIdx = 2 | |
208 | End If | |
ee7cd585 | 209 | Dim argv As New MalList() |
aaba2493 | 210 | For i As Integer = fileIdx+1 To args.Length-1 |
ee7cd585 JM |
211 | argv.conj_BANG(new MalString(args(i))) |
212 | Next | |
b8ee29b2 | 213 | repl_env.do_set(new MalSymbol("*ARGV*"), argv) |
ee7cd585 JM |
214 | |
215 | ' core.mal: defined using the language itself | |
216 | REP("(def! not (fn* (a) (if a false true)))") | |
e6d41de4 | 217 | REP("(def! load-file (fn* (f) (eval (read-string (str ""(do "" (slurp f) ""\nnil)"")))))") |
ee7cd585 | 218 | |
ee7cd585 JM |
219 | If args.Length > fileIdx Then |
220 | REP("(load-file """ & args(fileIdx) & """)") | |
221 | return 0 | |
222 | End If | |
223 | ||
224 | ' repl loop | |
225 | Dim line As String | |
226 | Do | |
227 | Try | |
228 | line = Mal.readline.Readline("user> ") | |
229 | If line is Nothing Then | |
230 | Exit Do | |
231 | End If | |
232 | If line = "" Then | |
233 | Continue Do | |
234 | End If | |
235 | Catch e As IOException | |
236 | Console.WriteLine("IOException: " & e.Message) | |
237 | End Try | |
238 | Try | |
239 | Console.WriteLine(REP(line)) | |
240 | Catch e as Exception | |
241 | Console.WriteLine("Error: " & e.Message) | |
242 | Console.WriteLine(e.StackTrace) | |
243 | Continue Do | |
244 | End Try | |
245 | Loop While True | |
246 | End function | |
aaba2493 | 247 | End Class |
ee7cd585 | 248 | End Namespace |