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var types = require('./types');
var reader = require('./reader');
if (typeof module !== 'undefined') {
var readline = require('./node_readline');
}
// read
function READ(str) {
return reader.read_str(str);
}
// eval
function eval_ast(ast, env) {
if (types.symbol_Q(ast)) {
return env.get(ast);
} else if (types.list_Q(ast)) {
return ast.map(function(a) { return EVAL(a, env); });
} else if (types.vector_Q(ast)) {
var v = ast.map(function(a) { return EVAL(a, env); });
v.__isvector__ = true;
return v;
} else if (types.hash_map_Q(ast)) {
var new_hm = {};
for (k in ast) {
new_hm[EVAL(k, env)] = EVAL(ast[k], env);
}
return new_hm;
} else {
return ast;
}
}
function _EVAL(ast, env) {
while (true) {
if (!types.list_Q(ast)) {
return eval_ast(ast, env);
}
// apply list
var a0 = ast[0], a1 = ast[1], a2 = ast[2], a3 = ast[3];
switch (a0.value) {
case "def!":
var res = EVAL(a2, env);
return env.set(a1, res);
case "let*":
var let_env = new types.Env(env);
for (var i=0; i < a1.length; i+=2) {
let_env.set(a1[i].value, EVAL(a1[i+1], let_env));
}
return EVAL(a2, let_env);
case "do":
eval_ast(ast.slice(1, -1), env);
ast = ast[ast.length-1];
break;
case "if":
var cond = EVAL(a1, env);
if (cond === null || cond === false) {
ast = (typeof a3 !== "undefined") ? a3 : null;
} else {
ast = a2;
}
break;
case "fn*":
return types.new_function(EVAL, a2, env, a1);
default:
var el = eval_ast(ast, env), f = el[0], meta = f.__meta__;
if (meta && meta.exp) {
ast = meta.exp;
env = new types.Env(meta.env, meta.params, el.slice(1));
} else {
return f.apply(f, el.slice(1));
}
}
}
}
function EVAL(ast, env) {
var result = _EVAL(ast, env);
return (typeof result !== "undefined") ? result : null;
}
// print
function PRINT(exp) {
return types._pr_str(exp, true);
}
// repl
var repl_env = new types.Env();
var rep = function(str) { return PRINT(EVAL(READ(str), repl_env)); };
_ref = function (k,v) { repl_env.set(k, v); }
// Import types functions
for (var n in types.ns) { repl_env.set(n, types.ns[n]); }
_ref('read-string', reader.read_str);
_ref('eval', function(ast) { return EVAL(ast, repl_env); });
_ref('slurp', function(f) {
return require('fs').readFileSync(f, 'utf-8');
});
_ref('slurp-do', function(f) {
return '(do ' + require('fs').readFileSync(f, 'utf-8') + ')';
});
// Defined using the language itself
rep("(def! not (fn* (a) (if a false true)))");
rep("(def! load-file (fn* (f) (eval (read-string (slurp-do f)))))");
if (typeof process !== 'undefined' && process.argv.length > 2) {
for (var i=2; i < process.argv.length; i++) {
rep('(load-file "' + process.argv[i] + '")');
}
} else if (typeof require === 'undefined') {
// Asynchronous browser mode
readline.rlwrap(function(line) { return rep(line); },
function(exc) {
if (exc instanceof reader.BlankException) { return; }
if (exc.stack) { console.log(exc.stack); } else { console.log(exc); }
});
} else if (require.main === module) {
// Synchronous node.js commandline mode
while (true) {
var line = readline.readline("user> ");
if (line === null) { break; }
try {
if (line) { console.log(rep(line)); }
} catch (exc) {
if (exc instanceof reader.BlankException) { continue; }
if (exc.stack) { console.log(exc.stack); } else { console.log(exc); }
}
}
} else {
exports.rep = rep;
}
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