1 if (typeof module
!== 'undefined') {
2 var types
= require('./types');
3 var readline
= require('./node_readline');
4 var reader
= require('./reader');
5 var printer
= require('./printer');
6 var Env
= require('./env').Env
;
7 var core
= require('./core');
12 return reader
.read_str(str
);
17 return types
._sequential_Q(x
) && x
.length
> 0;
20 function quasiquote(ast
) {
22 return [types
._symbol("quote"), ast
];
23 } else if (ast
[0].value
=== 'unquote') {
25 } else if (is_pair(ast
[0]) && ast
[0][0].value
=== 'splice-unquote') {
26 return [types
._symbol("concat"),
28 quasiquote(ast
.slice(1))];
30 return [types
._symbol("cons"),
32 quasiquote(ast
.slice(1))];
36 function is_macro_call(ast
, env
) {
37 return types
._list_Q(ast
) &&
38 types
._symbol_Q(ast
[0]) &&
39 env
.find(ast
[0].value
) &&
40 env
.get(ast
[0].value
)._ismacro_
;
43 function macroexpand(ast
, env
) {
44 while (is_macro_call(ast
, env
)) {
45 var mac
= env
.get(ast
[0]);
46 ast
= mac
.apply(mac
, ast
.slice(1));
51 function eval_ast(ast
, env
) {
52 if (types
._symbol_Q(ast
)) {
54 } else if (types
._list_Q(ast
)) {
55 return ast
.map(function(a
) { return EVAL(a
, env
); });
56 } else if (types
._vector_Q(ast
)) {
57 var v
= ast
.map(function(a
) { return EVAL(a
, env
); });
58 v
.__isvector__
= true;
60 } else if (types
._hash_map_Q(ast
)) {
63 new_hm
[EVAL(k
, env
)] = EVAL(ast
[k
], env
);
71 function _EVAL(ast
, env
) {
74 //printer.println("EVAL:", printer._pr_str(ast, true));
75 if (!types
._list_Q(ast
)) {
76 return eval_ast(ast
, env
);
80 ast
= macroexpand(ast
, env
);
81 if (!types
._list_Q(ast
)) { return ast
; }
83 var a0
= ast
[0], a1
= ast
[1], a2
= ast
[2], a3
= ast
[3];
86 var res
= EVAL(a2
, env
);
87 return env
.set(a1
, res
);
89 var let_env
= new Env(env
);
90 for (var i
=0; i
< a1
.length
; i
+=2) {
91 let_env
.set(a1
[i
].value
, EVAL(a1
[i
+1], let_env
));
102 var func
= EVAL(a2
, env
);
103 func
._ismacro_
= true;
104 return env
.set(a1
, func
);
106 return macroexpand(a1
, env
);
108 eval_ast(ast
.slice(1, -1), env
);
109 ast
= ast
[ast
.length
-1];
112 var cond
= EVAL(a1
, env
);
113 if (cond
=== null || cond
=== false) {
114 ast
= (typeof a3
!== "undefined") ? a3
: null;
120 return types
._function(EVAL
, Env
, a2
, env
, a1
);
122 var el
= eval_ast(ast
, env
), f
= el
[0];
125 env
= f
.__gen_env__(el
.slice(1));
127 return f
.apply(f
, el
.slice(1));
134 function EVAL(ast
, env
) {
135 var result
= _EVAL(ast
, env
);
136 return (typeof result
!== "undefined") ? result
: null;
140 function PRINT(exp
) {
141 return printer
._pr_str(exp
, true);
145 var repl_env
= new Env();
146 var rep = function(str
) { return PRINT(EVAL(READ(str
), repl_env
)); };
148 // core.js: defined using javascript
149 for (var n
in core
.ns
) { repl_env
.set(n
, core
.ns
[n
]); }
150 repl_env
.set('eval', function(ast
) { return EVAL(ast
, repl_env
); });
151 repl_env
.set('*ARGV*', []);
153 // core.mal: defined using the language itself
154 rep("(def! not (fn* (a) (if a false true)))");
155 rep("(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))");
156 rep("(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))");
157 rep("(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))");
159 if (typeof process
!== 'undefined' && process
.argv
.length
> 2) {
160 repl_env
.set('*ARGV*', process
.argv
.slice(3));
161 rep('(load-file "' + process
.argv
[2] + '")');
166 if (typeof require
!== 'undefined' && require
.main
=== module
) {
167 // Synchronous node.js commandline mode
169 var line
= readline
.readline("user> ");
170 if (line
=== null) { break; }
172 if (line
) { printer
.println(rep(line
)); }
174 if (exc
instanceof reader
.BlankException
) { continue; }
175 if (exc
.stack
) { printer
.println(exc
.stack
); }
176 else { printer
.println(exc
); }