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32d0a1cf | 1 | import Compat; |
1d166495 JM |
2 | import types.Types.MalType; |
3 | import types.Types.*; | |
dd7a4f55 | 4 | import types.MalException; |
1d166495 JM |
5 | import reader.*; |
6 | import printer.*; | |
7 | import env.*; | |
8 | import core.*; | |
9 | ||
10 | class Step7_quote { | |
11 | // READ | |
12 | static function READ(str:String):MalType { | |
13 | return Reader.read_str(str); | |
14 | } | |
15 | ||
16 | // EVAL | |
17 | static function is_pair(ast:MalType) { | |
18 | return switch (ast) { | |
19 | case MalList(l) | MalVector(l): l.length > 0; | |
20 | case _: false; | |
21 | } | |
22 | } | |
23 | ||
24 | static function quasiquote(ast:MalType) { | |
25 | if (!is_pair(ast)) { | |
26 | return MalList([MalSymbol("quote"), ast]); | |
27 | } else { | |
28 | var a0 = first(ast); | |
29 | if (_equal_Q(a0, MalSymbol("unquote"))) { | |
30 | return _nth(ast, 1); | |
31 | } else if (is_pair(a0)) { | |
32 | var a00 = first(a0); | |
33 | if (_equal_Q(a00, MalSymbol("splice-unquote"))) { | |
34 | return MalList([MalSymbol("concat"), | |
35 | _nth(a0, 1), | |
36 | quasiquote(rest(ast))]); | |
37 | } | |
38 | } | |
39 | return MalList([MalSymbol("cons"), | |
40 | quasiquote(a0), | |
41 | quasiquote(rest(ast))]); | |
42 | } | |
43 | } | |
44 | ||
45 | static function eval_ast(ast:MalType, env:Env) { | |
46 | return switch (ast) { | |
47 | case MalSymbol(s): env.get(ast); | |
48 | case MalList(l): | |
49 | MalList(l.map(function(x) { return EVAL(x, env); })); | |
50 | case MalVector(l): | |
51 | MalVector(l.map(function(x) { return EVAL(x, env); })); | |
52 | case MalHashMap(m): | |
53 | var new_map = new Map<String,MalType>(); | |
54 | for (k in m.keys()) { | |
55 | new_map[k] = EVAL(m[k], env); | |
56 | } | |
57 | MalHashMap(new_map); | |
58 | case _: ast; | |
59 | } | |
60 | } | |
61 | ||
62 | static function EVAL(ast:MalType, env:Env):MalType { | |
63 | while (true) { | |
64 | if (!list_Q(ast)) { return eval_ast(ast, env); } | |
65 | ||
66 | // apply | |
67 | var alst = _list(ast); | |
d3ec2994 | 68 | if (alst.length == 0) { return ast; } |
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69 | |
70 | switch (alst[0]) { | |
71 | case MalSymbol("def!"): | |
72 | return env.set(alst[1], EVAL(alst[2], env)); | |
73 | case MalSymbol("let*"): | |
74 | var let_env = new Env(env); | |
75 | switch (alst[1]) { | |
76 | case MalList(l) | MalVector(l): | |
77 | for (i in 0...l.length) { | |
78 | if ((i%2) > 0) { continue; } | |
79 | let_env.set(l[i], EVAL(l[i+1], let_env)); | |
80 | } | |
81 | case _: throw "Invalid let*"; | |
82 | } | |
83 | ast = alst[2]; | |
84 | env = let_env; | |
85 | continue; // TCO | |
86 | case MalSymbol("quote"): | |
87 | return alst[1]; | |
88 | case MalSymbol("quasiquote"): | |
89 | ast = quasiquote(alst[1]); | |
90 | continue; // TCO | |
91 | case MalSymbol("do"): | |
92 | var el = eval_ast(MalList(alst.slice(1, alst.length-1)), env); | |
93 | ast = last(ast); | |
94 | continue; // TCO | |
95 | case MalSymbol("if"): | |
96 | var cond = EVAL(alst[1], env); | |
97 | if (cond != MalFalse && cond != MalNil) { | |
98 | ast = alst[2]; | |
99 | } else if (alst.length > 3) { | |
100 | ast = alst[3]; | |
101 | } else { | |
102 | return MalNil; | |
103 | } | |
104 | continue; // TCO | |
105 | case MalSymbol("fn*"): | |
106 | return MalFunc(function (args) { | |
107 | return EVAL(alst[2], new Env(env, _list(alst[1]), args)); | |
108 | },alst[2],env,alst[1],false,nil); | |
109 | case _: | |
110 | var el = eval_ast(ast, env); | |
111 | var lst = _list(el); | |
112 | switch (first(el)) { | |
113 | case MalFunc(f,a,e,params,_,_): | |
114 | var args = _list(el).slice(1); | |
115 | if (a != null) { | |
116 | ast = a; | |
117 | env = new Env(e, _list(params), args); | |
118 | continue; // TCO | |
119 | } else { | |
120 | return f(args); | |
121 | } | |
122 | case _: throw "Call of non-function"; | |
123 | } | |
124 | } | |
125 | } | |
126 | } | |
127 | ||
128 | ||
129 | static function PRINT(exp:MalType):String { | |
130 | return Printer.pr_str(exp, true); | |
131 | } | |
132 | ||
133 | // repl | |
134 | static var repl_env = new Env(null); | |
135 | ||
136 | static function rep(line:String):String { | |
137 | return PRINT(EVAL(READ(line), repl_env)); | |
138 | } | |
139 | ||
140 | public static function main() { | |
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141 | // core.EXT: defined using Haxe |
142 | for (k in Core.ns.keys()) { | |
143 | repl_env.set(MalSymbol(k), MalFunc(Core.ns[k],null,null,null,false,nil)); | |
144 | } | |
145 | ||
146 | var evalfn = MalFunc(function(args) { | |
147 | return EVAL(args[0], repl_env); | |
148 | },null,null,null,false,nil); | |
149 | repl_env.set(MalSymbol("eval"), evalfn); | |
150 | ||
32d0a1cf JM |
151 | var cmdargs = Compat.cmdline_args(); |
152 | var argarray = cmdargs.map(function(a) { return MalString(a); }); | |
17946efb | 153 | repl_env.set(MalSymbol("*ARGV*"), MalList(argarray.slice(1))); |
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154 | |
155 | // core.mal: defined using the language itself | |
156 | rep("(def! not (fn* (a) (if a false true)))"); | |
157 | rep("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))"); | |
158 | ||
159 | if (cmdargs.length > 0) { | |
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160 | rep('(load-file "${cmdargs[0]}")'); |
161 | Compat.exit(0); | |
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162 | } |
163 | ||
164 | while (true) { | |
165 | try { | |
32d0a1cf | 166 | var line = Compat.readline("user> "); |
1d166495 | 167 | if (line == "") { continue; } |
32d0a1cf | 168 | Compat.println(rep(line)); |
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169 | } catch (exc:BlankLine) { |
170 | continue; | |
171 | } catch (exc:haxe.io.Eof) { | |
32d0a1cf | 172 | Compat.exit(0); |
1d166495 | 173 | } catch (exc:Dynamic) { |
dd7a4f55 JM |
174 | if (Type.getClass(exc) == MalException) { |
175 | Compat.println("Error: " + Printer.pr_str(exc.obj, true)); | |
176 | } else { | |
177 | Compat.println("Error: " + exc); | |
178 | }; | |
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179 | } |
180 | } | |
181 | } | |
182 | } |