[jackhill/mal.git] / c / step6_file.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "types.h"
#include "readline.h"
#include "reader.h"
#include "core.h"

// Declarations
MalVal *EVAL(MalVal *ast, Env *env);

// read
MalVal *READ(char prompt[], char *str) {
    char *line;
    MalVal *ast;
    if (str) {
        line = str;
    } else {
        line = _readline(prompt);
        if (!line) {
            _error("EOF");
            return NULL;
        }
    }
    ast = read_str(line);
    if (!str) { MAL_GC_FREE(line); }
    return ast;
}

// eval
MalVal *eval_ast(MalVal *ast, Env *env) {
    if (!ast || mal_error) return NULL;
    if (ast->type == MAL_SYMBOL) {
        //g_print("EVAL symbol: %s\n", ast->val.string);
        return env_get(env, ast);
    } else if ((ast->type == MAL_LIST) || (ast->type == MAL_VECTOR)) {
        //g_print("EVAL sequential: %s\n", _pr_str(ast,1));
        MalVal *el = _map2((MalVal *(*)(void*, void*))EVAL, ast, env);
        if (!el || mal_error) return NULL;
        el->type = ast->type;
        return el;
    } else if (ast->type == MAL_HASH_MAP) {
        //g_print("EVAL hash_map: %s\n", _pr_str(ast,1));
        GHashTableIter iter;
        gpointer key, value;
        MalVal *seq = malval_new_list(MAL_LIST,
                                    g_array_sized_new(TRUE, TRUE, sizeof(MalVal*),
                                                        _count(ast)));
        g_hash_table_iter_init (&iter, ast->val.hash_table);
        while (g_hash_table_iter_next (&iter, &key, &value)) {
            MalVal *kname = malval_new_string((char *)key);
            g_array_append_val(seq->val.array, kname);
            MalVal *new_val = EVAL((MalVal *)value, env);
            g_array_append_val(seq->val.array, new_val);
        }
        return _hash_map(seq);
    } else {
        //g_print("EVAL scalar: %s\n", _pr_str(ast,1));
        return ast;
    }
}

MalVal *EVAL(MalVal *ast, Env *env) {
    while (TRUE) {

    if (!ast || mal_error) return NULL;
    //g_print("EVAL: %s\n", _pr_str(ast,1));
    if (ast->type != MAL_LIST) {
        return eval_ast(ast, env);
    }
    if (!ast || mal_error) return NULL;

    // apply list
    //g_print("EVAL apply list: %s\n", _pr_str(ast,1));
    int i, len;
    if (_count(ast) == 0) { return ast; }
    MalVal *a0 = _nth(ast, 0);
    if ((a0->type & MAL_SYMBOL) &&
        strcmp("def!", a0->val.string) == 0) {
        //g_print("eval apply def!\n");
        MalVal *a1 = _nth(ast, 1),
               *a2 = _nth(ast, 2);
        MalVal *res = EVAL(a2, env);
        if (mal_error) return NULL;
        env_set(env, a1, res);
        return res;
    } else if ((a0->type & MAL_SYMBOL) &&
               strcmp("let*", a0->val.string) == 0) {
        //g_print("eval apply let*\n");
        MalVal *a1 = _nth(ast, 1),
               *a2 = _nth(ast, 2),
               *key, *val;
        assert_type(a1, MAL_LIST|MAL_VECTOR,
                    "let* bindings must be list or vector");
        len = _count(a1);
        assert((len % 2) == 0, "odd number of let* bindings forms");
        Env *let_env = new_env(env, NULL, NULL);
        for(i=0; i<len; i+=2) {
            key = g_array_index(a1->val.array, MalVal*, i);
            val = g_array_index(a1->val.array, MalVal*, i+1);
            assert_type(key, MAL_SYMBOL, "let* bind to non-symbol");
            env_set(let_env, key, EVAL(val, let_env));
        }
        ast = a2;
        env = let_env;
        // Continue loop
    } else if ((a0->type & MAL_SYMBOL) &&
               strcmp("do", a0->val.string) == 0) {
        //g_print("eval apply do\n");
        eval_ast(_slice(ast, 1, _count(ast)-1), env);
        ast = _last(ast);
        // Continue loop
    } else if ((a0->type & MAL_SYMBOL) &&
               strcmp("if", a0->val.string) == 0) {
        //g_print("eval apply if\n");
        MalVal *a1 = _nth(ast, 1);
        MalVal *cond = EVAL(a1, env);
        if (!cond || mal_error) return NULL;
        if (cond->type & (MAL_FALSE|MAL_NIL)) {
            // eval false slot form
            if (ast->val.array->len > 3) {
                ast = _nth(ast, 3);
            } else {
                return &mal_nil;
            }
        } else {
            // eval true slot form
            ast = _nth(ast, 2);
        }
        // Continue loop
    } else if ((a0->type & MAL_SYMBOL) &&
               strcmp("fn*", a0->val.string) == 0) {
        //g_print("eval apply fn*\n");
        MalVal *mf = malval_new(MAL_FUNCTION_MAL, NULL);
        mf->val.func.evaluator = EVAL;
        mf->val.func.args = _nth(ast, 1);
        mf->val.func.body = _nth(ast, 2);
        mf->val.func.env = env;
        return mf;
    } else {
        //g_print("eval apply\n");
        MalVal *el = eval_ast(ast, env);
        if (!el || mal_error) { return NULL; }
        MalVal *f = _first(el),
               *args = _rest(el);
        assert_type(f, MAL_FUNCTION_C|MAL_FUNCTION_MAL,
                    "cannot apply '%s'", _pr_str(f,1));
        if (f->type & MAL_FUNCTION_MAL) {
            ast = f->val.func.body;
            env = new_env(f->val.func.env, f->val.func.args, args);
            // Continue loop
        } else {
            return _apply(f, args);
        }
    }

    } // TCO while loop
}

// print
char *PRINT(MalVal *exp) {
    if (mal_error) {
        return NULL;
    }
    return _pr_str(exp,1);
}

// repl

// read and eval
MalVal *RE(Env *env, char *prompt, char *str) {
    MalVal *ast, *exp;
    ast = READ(prompt, str);
    if (!ast || mal_error) return NULL;
    exp = EVAL(ast, env);
    if (ast != exp) {
        malval_free(ast);    // Free input structure
    }
    return exp;
}

// Setup the initial REPL environment
Env *repl_env;

MalVal *do_eval(MalVal *ast) { return EVAL(ast, repl_env); }

void init_repl_env(int argc, char *argv[]) {
    repl_env = new_env(NULL, NULL, NULL);

    // core.c: defined using C
    int i;
    for(i=0; i < (sizeof(core_ns) / sizeof(core_ns[0])); i++) {
        env_set(repl_env,
                malval_new_symbol(core_ns[i].name),
                malval_new_function(core_ns[i].func, core_ns[i].arg_cnt));
    }
    env_set(repl_env,
            malval_new_symbol("eval"),
            malval_new_function((void*(*)(void *))do_eval, 1));

    MalVal *_argv = _listX(0);
    for (i=2; i < argc; i++) {
        MalVal *arg = malval_new_string(argv[i]);
        g_array_append_val(_argv->val.array, arg);
    }
    env_set(repl_env, malval_new_symbol("*ARGV*"), _argv);

    // core.mal: defined using the language itself
    RE(repl_env, "", "(def! not (fn* (a) (if a false true)))");
    RE(repl_env, "",
       "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))");
}

int main(int argc, char *argv[])
{
    MalVal *exp;
    char *output;
    char prompt[100];

    MAL_GC_SETUP();

    // Set the initial prompt and environment
    snprintf(prompt, sizeof(prompt), "user> ");
    init_repl_env(argc, argv);

    if (argc > 1) {
        char *cmd = g_strdup_printf("(load-file \"%s\")", argv[1]);
        RE(repl_env, "", cmd);
        return 0;
    }

    // repl loop
    for(;;) {
        exp = RE(repl_env, prompt, NULL);
        if (mal_error && strcmp("EOF", mal_error->val.string) == 0) {
            return 0;
        }
        output = PRINT(exp);

        if (mal_error) {
            fprintf(stderr, "Error: %s\n", _pr_str(mal_error,1));
            malval_free(mal_error);
            mal_error = NULL;
        } else if (output) {
            puts(output);
            MAL_GC_FREE(output);        // Free output string
        }

        //malval_free(exp);    // Free evaluated expression
    }
}
Commit	Line	Data
31690700 JM	1	#include <stdlib.h>
31690700 JM	2	#include <stdio.h>
b81b2a7e	3	#include <string.h>
31690700	4	#include <unistd.h>
8cb5cda4	5
31690700 JM	6	#include "types.h"
	7	#include "readline.h"
	8	#include "reader.h"
ea81a808	9	#include "core.h"
31690700 JM	10
	11	// Declarations
	12	MalVal EVAL(MalVal ast, Env *env);
	13
	14	// read
	15	MalVal READ(char prompt[], char str) {
	16	char *line;
	17	MalVal *ast;
	18	if (str) {
	19	line = str;
	20	} else {
	21	line = _readline(prompt);
	22	if (!line) {
	23	_error("EOF");
	24	return NULL;
	25	}
	26	}
	27	ast = read_str(line);
6b3ecaa7	28	if (!str) { MAL_GC_FREE(line); }
31690700 JM	29	return ast;
	30	}
	31
	32	// eval
	33	MalVal eval_ast(MalVal ast, Env *env) {
	34	if (!ast \|\| mal_error) return NULL;
	35	if (ast->type == MAL_SYMBOL) {
	36	//g_print("EVAL symbol: %s\n", ast->val.string);
b8ee29b2	37	return env_get(env, ast);
31690700 JM	38	} else if ((ast->type == MAL_LIST) \|\| (ast->type == MAL_VECTOR)) {
	39	//g_print("EVAL sequential: %s\n", _pr_str(ast,1));
	40	MalVal el = _map2((MalVal ()(void, void*))EVAL, ast, env);
	41	if (!el \|\| mal_error) return NULL;
	42	el->type = ast->type;
	43	return el;
	44	} else if (ast->type == MAL_HASH_MAP) {
	45	//g_print("EVAL hash_map: %s\n", _pr_str(ast,1));
	46	GHashTableIter iter;
	47	gpointer key, value;
	48	MalVal *seq = malval_new_list(MAL_LIST,
	49	g_array_sized_new(TRUE, TRUE, sizeof(MalVal*),
	50	_count(ast)));
	51	g_hash_table_iter_init (&iter, ast->val.hash_table);
	52	while (g_hash_table_iter_next (&iter, &key, &value)) {
	53	MalVal kname = malval_new_string((char )key);
	54	g_array_append_val(seq->val.array, kname);
	55	MalVal new_val = EVAL((MalVal )value, env);
	56	g_array_append_val(seq->val.array, new_val);
	57	}
8cb5cda4	58	return _hash_map(seq);
31690700 JM	59	} else {
	60	//g_print("EVAL scalar: %s\n", _pr_str(ast,1));
	61	return ast;
	62	}
	63	}
	64
	65	MalVal EVAL(MalVal ast, Env *env) {
	66	while (TRUE) {
31690700	67
8cb5cda4 JM	68	if (!ast \|\| mal_error) return NULL;
	69	//g_print("EVAL: %s\n", _pr_str(ast,1));
	70	if (ast->type != MAL_LIST) {
	71	return eval_ast(ast, env);
	72	}
	73	if (!ast \|\| mal_error) return NULL;
	74
	75	// apply list
	76	//g_print("EVAL apply list: %s\n", _pr_str(ast,1));
	77	int i, len;
	78	if (_count(ast) == 0) { return ast; }
	79	MalVal *a0 = _nth(ast, 0);
	80	if ((a0->type & MAL_SYMBOL) &&
	81	strcmp("def!", a0->val.string) == 0) {
	82	//g_print("eval apply def!\n");
	83	MalVal *a1 = _nth(ast, 1),
	84	*a2 = _nth(ast, 2);
	85	MalVal *res = EVAL(a2, env);
b8ee29b2 JM	86	if (mal_error) return NULL;
b8ee29b2 JM	87	env_set(env, a1, res);
8cb5cda4 JM	88	return res;
	89	} else if ((a0->type & MAL_SYMBOL) &&
	90	strcmp("let*", a0->val.string) == 0) {
	91	//g_print("eval apply let*\n");
	92	MalVal *a1 = _nth(ast, 1),
	93	*a2 = _nth(ast, 2),
	94	key, val;
	95	assert_type(a1, MAL_LIST\|MAL_VECTOR,
	96	"let* bindings must be list or vector");
	97	len = _count(a1);
	98	assert((len % 2) == 0, "odd number of let* bindings forms");
	99	Env *let_env = new_env(env, NULL, NULL);
	100	for(i=0; i<len; i+=2) {
	101	key = g_array_index(a1->val.array, MalVal*, i);
	102	val = g_array_index(a1->val.array, MalVal*, i+1);
	103	assert_type(key, MAL_SYMBOL, "let* bind to non-symbol");
b8ee29b2	104	env_set(let_env, key, EVAL(val, let_env));
8cb5cda4	105	}
6301e0b6 JM	106	ast = a2;
	107	env = let_env;
	108	// Continue loop
8cb5cda4 JM	109	} else if ((a0->type & MAL_SYMBOL) &&
	110	strcmp("do", a0->val.string) == 0) {
	111	//g_print("eval apply do\n");
	112	eval_ast(_slice(ast, 1, _count(ast)-1), env);
	113	ast = _last(ast);
	114	// Continue loop
	115	} else if ((a0->type & MAL_SYMBOL) &&
	116	strcmp("if", a0->val.string) == 0) {
	117	//g_print("eval apply if\n");
	118	MalVal *a1 = _nth(ast, 1);
	119	MalVal *cond = EVAL(a1, env);
	120	if (!cond \|\| mal_error) return NULL;
	121	if (cond->type & (MAL_FALSE\|MAL_NIL)) {
	122	// eval false slot form
b8ee29b2 JM	123	if (ast->val.array->len > 3) {
	124	ast = _nth(ast, 3);
	125	} else {
8cb5cda4	126	return &mal_nil;
31690700	127	}
8cb5cda4 JM	128	} else {
	129	// eval true slot form
	130	ast = _nth(ast, 2);
	131	}
	132	// Continue loop
	133	} else if ((a0->type & MAL_SYMBOL) &&
	134	strcmp("fn*", a0->val.string) == 0) {
	135	//g_print("eval apply fn*\n");
	136	MalVal *mf = malval_new(MAL_FUNCTION_MAL, NULL);
	137	mf->val.func.evaluator = EVAL;
	138	mf->val.func.args = _nth(ast, 1);
	139	mf->val.func.body = _nth(ast, 2);
	140	mf->val.func.env = env;
	141	return mf;
	142	} else {
	143	//g_print("eval apply\n");
	144	MalVal *el = eval_ast(ast, env);
	145	if (!el \|\| mal_error) { return NULL; }
	146	MalVal *f = _first(el),
	147	*args = _rest(el);
	148	assert_type(f, MAL_FUNCTION_C\|MAL_FUNCTION_MAL,
	149	"cannot apply '%s'", _pr_str(f,1));
	150	if (f->type & MAL_FUNCTION_MAL) {
	151	ast = f->val.func.body;
	152	env = new_env(f->val.func.env, f->val.func.args, args);
31690700	153	// Continue loop
31690700	154	} else {
8cb5cda4	155	return _apply(f, args);
31690700 JM	156	}
31690700 JM	157	}
8cb5cda4 JM	158
8cb5cda4 JM	159	} // TCO while loop
31690700 JM	160	}
	161
	162	// print
	163	char PRINT(MalVal exp) {
	164	if (mal_error) {
31690700 JM	165	return NULL;
	166	}
	167	return _pr_str(exp,1);
	168	}
	169
	170	// repl
	171
	172	// read and eval
	173	MalVal RE(Env env, char prompt, char str) {
	174	MalVal ast, exp;
	175	ast = READ(prompt, str);
	176	if (!ast \|\| mal_error) return NULL;
	177	exp = EVAL(ast, env);
	178	if (ast != exp) {
	179	malval_free(ast); // Free input structure
	180	}
	181	return exp;
	182	}
	183
	184	// Setup the initial REPL environment
	185	Env *repl_env;
	186
b81b2a7e LB	187	MalVal do_eval(MalVal ast) { return EVAL(ast, repl_env); }
b81b2a7e LB	188
86b689f3	189	void init_repl_env(int argc, char *argv[]) {
31690700 JM	190	repl_env = new_env(NULL, NULL, NULL);
31690700 JM	191
8cb5cda4	192	// core.c: defined using C
31690700	193	int i;
86b689f3	194	for(i=0; i < (sizeof(core_ns) / sizeof(core_ns[0])); i++) {
b8ee29b2 JM	195	env_set(repl_env,
b8ee29b2 JM	196	malval_new_symbol(core_ns[i].name),
8cb5cda4	197	malval_new_function(core_ns[i].func, core_ns[i].arg_cnt));
31690700	198	}
b8ee29b2 JM	199	env_set(repl_env,
b8ee29b2 JM	200	malval_new_symbol("eval"),
8cb5cda4	201	malval_new_function((void()(void *))do_eval, 1));
31690700	202
86b689f3 JM	203	MalVal *_argv = _listX(0);
	204	for (i=2; i < argc; i++) {
	205	MalVal *arg = malval_new_string(argv[i]);
	206	g_array_append_val(_argv->val.array, arg);
	207	}
b8ee29b2	208	env_set(repl_env, malval_new_symbol("ARGV"), _argv);
86b689f3	209
8cb5cda4	210	// core.mal: defined using the language itself
31690700 JM	211	RE(repl_env, "", "(def! not (fn* (a) (if a false true)))");
31690700 JM	212	RE(repl_env, "",
e6d41de4	213	"(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))");
31690700 JM	214	}
	215
	216	int main(int argc, char *argv[])
	217	{
	218	MalVal *exp;
	219	char *output;
	220	char prompt[100];
	221
6b3ecaa7 DM	222	MAL_GC_SETUP();
6b3ecaa7 DM	223
31690700 JM	224	// Set the initial prompt and environment
31690700 JM	225	snprintf(prompt, sizeof(prompt), "user> ");
86b689f3	226	init_repl_env(argc, argv);
dd7a4f55	227
31690700 JM	228	if (argc > 1) {
	229	char *cmd = g_strdup_printf("(load-file \"%s\")", argv[1]);
	230	RE(repl_env, "", cmd);
8cb5cda4 JM	231	return 0;
8cb5cda4 JM	232	}
31690700	233
86b689f3	234	// repl loop
8cb5cda4 JM	235	for(;;) {
	236	exp = RE(repl_env, prompt, NULL);
	237	if (mal_error && strcmp("EOF", mal_error->val.string) == 0) {
	238	return 0;
	239	}
	240	output = PRINT(exp);
31690700	241
dd7a4f55 JM	242	if (mal_error) {
	243	fprintf(stderr, "Error: %s\n", _pr_str(mal_error,1));
	244	malval_free(mal_error);
	245	mal_error = NULL;
	246	} else if (output) {
6b3ecaa7 DM	247	puts(output);
6b3ecaa7 DM	248	MAL_GC_FREE(output); // Free output string
31690700	249	}
8cb5cda4 JM	250
8cb5cda4 JM	251	//malval_free(exp); // Free evaluated expression
31690700 JM	252	}
31690700 JM	253	}