Commit | Line | Data |
---|---|---|
31690700 | 1 | if (typeof module !== 'undefined') { |
31b44161 | 2 | var types = require('./types'); |
31690700 | 3 | var readline = require('./node_readline'); |
31b44161 JM |
4 | var reader = require('./reader'); |
5 | var printer = require('./printer'); | |
6 | var Env = require('./env').Env; | |
7 | var core = require('./core'); | |
31690700 JM |
8 | } |
9 | ||
10 | // read | |
11 | function READ(str) { | |
12 | return reader.read_str(str); | |
13 | } | |
14 | ||
15 | // eval | |
16 | function eval_ast(ast, env) { | |
ea81a808 | 17 | if (types._symbol_Q(ast)) { |
31690700 | 18 | return env.get(ast); |
ea81a808 | 19 | } else if (types._list_Q(ast)) { |
31690700 | 20 | return ast.map(function(a) { return EVAL(a, env); }); |
ea81a808 | 21 | } else if (types._vector_Q(ast)) { |
31690700 JM |
22 | var v = ast.map(function(a) { return EVAL(a, env); }); |
23 | v.__isvector__ = true; | |
24 | return v; | |
ea81a808 | 25 | } else if (types._hash_map_Q(ast)) { |
31690700 JM |
26 | var new_hm = {}; |
27 | for (k in ast) { | |
28 | new_hm[EVAL(k, env)] = EVAL(ast[k], env); | |
29 | } | |
30 | return new_hm; | |
31 | } else { | |
32 | return ast; | |
33 | } | |
34 | } | |
35 | ||
36 | function _EVAL(ast, env) { | |
86b689f3 | 37 | //printer.println("EVAL:", printer._pr_str(ast, true)); |
ea81a808 | 38 | if (!types._list_Q(ast)) { |
31690700 JM |
39 | return eval_ast(ast, env); |
40 | } | |
41 | ||
42 | // apply list | |
43 | var a0 = ast[0], a1 = ast[1], a2 = ast[2], a3 = ast[3]; | |
44 | switch (a0.value) { | |
45 | case "def!": | |
46 | var res = EVAL(a2, env); | |
47 | return env.set(a1, res); | |
48 | case "let*": | |
ea81a808 | 49 | var let_env = new Env(env); |
31690700 | 50 | for (var i=0; i < a1.length; i+=2) { |
b8ee29b2 | 51 | let_env.set(a1[i], EVAL(a1[i+1], let_env)); |
31690700 JM |
52 | } |
53 | return EVAL(a2, let_env); | |
54 | case "do": | |
55 | var el = eval_ast(ast.slice(1), env); | |
56 | return el[el.length-1]; | |
57 | case "if": | |
58 | var cond = EVAL(a1, env); | |
59 | if (cond === null || cond === false) { | |
60 | return typeof a3 !== "undefined" ? EVAL(a3, env) : null; | |
61 | } else { | |
62 | return EVAL(a2, env); | |
63 | } | |
64 | case "fn*": | |
65 | return function() { | |
ea81a808 | 66 | return EVAL(a2, new Env(env, a1, arguments)); |
31690700 JM |
67 | }; |
68 | default: | |
69 | var el = eval_ast(ast, env), f = el[0]; | |
70 | return f.apply(f, el.slice(1)); | |
71 | } | |
72 | } | |
73 | ||
74 | function EVAL(ast, env) { | |
75 | var result = _EVAL(ast, env); | |
76 | return (typeof result !== "undefined") ? result : null; | |
77 | } | |
78 | ||
79 | ||
80 | function PRINT(exp) { | |
ea81a808 | 81 | return printer._pr_str(exp, true); |
31690700 JM |
82 | } |
83 | ||
84 | // repl | |
ea81a808 | 85 | var repl_env = new Env(); |
31690700 | 86 | var rep = function(str) { return PRINT(EVAL(READ(str), repl_env)); }; |
31690700 | 87 | |
8cb5cda4 | 88 | // core.js: defined using javascript |
b8ee29b2 | 89 | for (var n in core.ns) { repl_env.set(types._symbol(n), core.ns[n]); } |
31690700 | 90 | |
8cb5cda4 | 91 | // core.mal: defined using the language itself |
31690700 JM |
92 | rep("(def! not (fn* (a) (if a false true)))"); |
93 | ||
86b689f3 | 94 | // repl loop |
e4393504 | 95 | if (typeof require !== 'undefined' && require.main === module) { |
31690700 JM |
96 | // Synchronous node.js commandline mode |
97 | while (true) { | |
98 | var line = readline.readline("user> "); | |
99 | if (line === null) { break; } | |
100 | try { | |
31b44161 | 101 | if (line) { printer.println(rep(line)); } |
31690700 JM |
102 | } catch (exc) { |
103 | if (exc instanceof reader.BlankException) { continue; } | |
31b44161 JM |
104 | if (exc.stack) { printer.println(exc.stack); } |
105 | else { printer.println(exc); } | |
31690700 JM |
106 | } |
107 | } | |
31690700 | 108 | } |