diff options
Diffstat (limited to 'js/step6_file.js')
| -rw-r--r-- | js/step6_file.js | 96 |
1 files changed, 51 insertions, 45 deletions
diff --git a/js/step6_file.js b/js/step6_file.js index 6a014eb..df216da 100644 --- a/js/step6_file.js +++ b/js/step6_file.js @@ -1,5 +1,8 @@ var types = require('./types'); var reader = require('./reader'); +var printer = require('./printer'); +var Env = require('./env').Env; +var core = require('./core'); if (typeof module !== 'undefined') { var readline = require('./node_readline'); } @@ -11,15 +14,15 @@ function READ(str) { // eval function eval_ast(ast, env) { - if (types.symbol_Q(ast)) { + if (types._symbol_Q(ast)) { return env.get(ast); - } else if (types.list_Q(ast)) { + } else if (types._list_Q(ast)) { return ast.map(function(a) { return EVAL(a, env); }); - } else if (types.vector_Q(ast)) { + } 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)) { + } else if (types._hash_map_Q(ast)) { var new_hm = {}; for (k in ast) { new_hm[EVAL(k, env)] = EVAL(ast[k], env); @@ -32,45 +35,48 @@ function eval_ast(ast, env) { function _EVAL(ast, env) { while (true) { - if (!types.list_Q(ast)) { - return eval_ast(ast, env); + + //console.log("EVAL:", types._pr_str(ast, 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 Env(env); + for (var i=0; i < a1.length; i+=2) { + let_env.set(a1[i].value, EVAL(a1[i+1], let_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)); - } + 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._function(EVAL, Env, 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 Env(meta.env, meta.params, el.slice(1)); + } else { + return f.apply(f, el.slice(1)); + } + } + } } @@ -81,16 +87,16 @@ function EVAL(ast, env) { // print function PRINT(exp) { - return types._pr_str(exp, true); + return printer._pr_str(exp, true); } // repl -var repl_env = new types.Env(); +var repl_env = new 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]); } +// Import core functions +for (var n in core.ns) { repl_env.set(n, core.ns[n]); } _ref('read-string', reader.read_str); _ref('eval', function(ast) { return EVAL(ast, repl_env); }); |
