[jackhill/mal.git] / c / step7_quote.c

#include <stdlib.h>
#include <stdio.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) { free(line); }
    return ast;
}

// eval
int is_pair(MalVal *x) {
    return _sequential_Q(x) && (_count(x) > 0);
}

MalVal *quasiquote(MalVal *ast) {
    if (!is_pair(ast)) {
        return _listX(2, malval_new_symbol("quote"), ast);
    } else {
        MalVal *a0 = _nth(ast, 0);
        if ((a0->type & MAL_SYMBOL) &&
            strcmp("unquote", a0->val.string) == 0) {
            return _nth(ast, 1);
        } else if (is_pair(a0)) {
            MalVal *a00 = _nth(a0, 0);
            if ((a00->type & MAL_SYMBOL) &&
                strcmp("splice-unquote", a00->val.string) == 0) {
                return _listX(3, malval_new_symbol("concat"),
                                 _nth(a0, 1),
                                 quasiquote(_rest(ast)));
            }
        }
        return _listX(3, malval_new_symbol("cons"),
                         quasiquote(a0),
                         quasiquote(_rest(ast)));
    }
}

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("quote", a0->val.string) == 0) {
        //g_print("eval apply quote\n");
        return _nth(ast, 1);
    } else if ((a0->type & MAL_SYMBOL) &&
               strcmp("quasiquote", a0->val.string) == 0) {
        //g_print("eval apply quasiquote\n");
        MalVal *a1 = _nth(ast, 1);
        ast = quasiquote(a1);
        // 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) {
        fprintf(stderr, "Error: %s\n", mal_error->val.string);
        malval_free(mal_error);
        mal_error = NULL;
        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;

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

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

    // 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 (output) { 
            g_print("%s\n", output);
            free(output);        // Free output string
        }

        //malval_free(exp);    // Free evaluated expression
    }
}
Commit	Line	Data
31690700 JM	1	#include <stdlib.h>
	2	#include <stdio.h>
	3	#include <unistd.h>
8cb5cda4	4
31690700 JM	5	#include "types.h"
	6	#include "readline.h"
	7	#include "reader.h"
ea81a808	8	#include "core.h"
31690700 JM	9
	10	// Declarations
	11	MalVal EVAL(MalVal ast, Env *env);
	12
	13	// read
	14	MalVal READ(char prompt[], char str) {
	15	char *line;
	16	MalVal *ast;
	17	if (str) {
	18	line = str;
	19	} else {
	20	line = _readline(prompt);
	21	if (!line) {
	22	_error("EOF");
	23	return NULL;
	24	}
	25	}
	26	ast = read_str(line);
	27	if (!str) { free(line); }
	28	return ast;
	29	}
	30
	31	// eval
	32	int is_pair(MalVal *x) {
	33	return _sequential_Q(x) && (_count(x) > 0);
	34	}
	35
	36	MalVal quasiquote(MalVal ast) {
	37	if (!is_pair(ast)) {
ea81a808	38	return _listX(2, malval_new_symbol("quote"), ast);
31690700 JM	39	} else {
	40	MalVal *a0 = _nth(ast, 0);
	41	if ((a0->type & MAL_SYMBOL) &&
	42	strcmp("unquote", a0->val.string) == 0) {
	43	return _nth(ast, 1);
	44	} else if (is_pair(a0)) {
	45	MalVal *a00 = _nth(a0, 0);
	46	if ((a00->type & MAL_SYMBOL) &&
	47	strcmp("splice-unquote", a00->val.string) == 0) {
ea81a808 JM	48	return _listX(3, malval_new_symbol("concat"),
ea81a808 JM	49	_nth(a0, 1),
8cb5cda4	50	quasiquote(_rest(ast)));
31690700 JM	51	}
31690700 JM	52	}
ea81a808 JM	53	return _listX(3, malval_new_symbol("cons"),
ea81a808 JM	54	quasiquote(a0),
8cb5cda4	55	quasiquote(_rest(ast)));
31690700 JM	56	}
	57	}
	58
	59	MalVal eval_ast(MalVal ast, Env *env) {
	60	if (!ast \|\| mal_error) return NULL;
	61	if (ast->type == MAL_SYMBOL) {
	62	//g_print("EVAL symbol: %s\n", ast->val.string);
b8ee29b2	63	return env_get(env, ast);
31690700 JM	64	} else if ((ast->type == MAL_LIST) \|\| (ast->type == MAL_VECTOR)) {
	65	//g_print("EVAL sequential: %s\n", _pr_str(ast,1));
	66	MalVal el = _map2((MalVal ()(void, void*))EVAL, ast, env);
	67	if (!el \|\| mal_error) return NULL;
	68	el->type = ast->type;
	69	return el;
	70	} else if (ast->type == MAL_HASH_MAP) {
	71	//g_print("EVAL hash_map: %s\n", _pr_str(ast,1));
	72	GHashTableIter iter;
	73	gpointer key, value;
	74	MalVal *seq = malval_new_list(MAL_LIST,
	75	g_array_sized_new(TRUE, TRUE, sizeof(MalVal*),
	76	_count(ast)));
	77	g_hash_table_iter_init (&iter, ast->val.hash_table);
	78	while (g_hash_table_iter_next (&iter, &key, &value)) {
	79	MalVal kname = malval_new_string((char )key);
	80	g_array_append_val(seq->val.array, kname);
	81	MalVal new_val = EVAL((MalVal )value, env);
	82	g_array_append_val(seq->val.array, new_val);
	83	}
8cb5cda4	84	return _hash_map(seq);
31690700 JM	85	} else {
	86	//g_print("EVAL scalar: %s\n", _pr_str(ast,1));
	87	return ast;
	88	}
	89	}
	90
	91	MalVal EVAL(MalVal ast, Env *env) {
	92	while (TRUE) {
31690700	93
8cb5cda4 JM	94	if (!ast \|\| mal_error) return NULL;
	95	//g_print("EVAL: %s\n", _pr_str(ast,1));
	96	if (ast->type != MAL_LIST) {
	97	return eval_ast(ast, env);
	98	}
	99	if (!ast \|\| mal_error) return NULL;
	100
	101	// apply list
	102	//g_print("EVAL apply list: %s\n", _pr_str(ast,1));
	103	int i, len;
	104	if (_count(ast) == 0) { return ast; }
	105	MalVal *a0 = _nth(ast, 0);
	106	if ((a0->type & MAL_SYMBOL) &&
	107	strcmp("def!", a0->val.string) == 0) {
	108	//g_print("eval apply def!\n");
	109	MalVal *a1 = _nth(ast, 1),
	110	*a2 = _nth(ast, 2);
	111	MalVal *res = EVAL(a2, env);
b8ee29b2 JM	112	if (mal_error) return NULL;
b8ee29b2 JM	113	env_set(env, a1, res);
8cb5cda4 JM	114	return res;
	115	} else if ((a0->type & MAL_SYMBOL) &&
	116	strcmp("let*", a0->val.string) == 0) {
	117	//g_print("eval apply let*\n");
	118	MalVal *a1 = _nth(ast, 1),
	119	*a2 = _nth(ast, 2),
	120	key, val;
	121	assert_type(a1, MAL_LIST\|MAL_VECTOR,
	122	"let* bindings must be list or vector");
	123	len = _count(a1);
	124	assert((len % 2) == 0, "odd number of let* bindings forms");
	125	Env *let_env = new_env(env, NULL, NULL);
	126	for(i=0; i<len; i+=2) {
	127	key = g_array_index(a1->val.array, MalVal*, i);
	128	val = g_array_index(a1->val.array, MalVal*, i+1);
	129	assert_type(key, MAL_SYMBOL, "let* bind to non-symbol");
b8ee29b2	130	env_set(let_env, key, EVAL(val, let_env));
8cb5cda4	131	}
6301e0b6 JM	132	ast = a2;
	133	env = let_env;
	134	// Continue loop
8cb5cda4 JM	135	} else if ((a0->type & MAL_SYMBOL) &&
	136	strcmp("quote", a0->val.string) == 0) {
	137	//g_print("eval apply quote\n");
	138	return _nth(ast, 1);
	139	} else if ((a0->type & MAL_SYMBOL) &&
	140	strcmp("quasiquote", a0->val.string) == 0) {
	141	//g_print("eval apply quasiquote\n");
	142	MalVal *a1 = _nth(ast, 1);
6301e0b6 JM	143	ast = quasiquote(a1);
6301e0b6 JM	144	// Continue loop
8cb5cda4 JM	145	} else if ((a0->type & MAL_SYMBOL) &&
	146	strcmp("do", a0->val.string) == 0) {
	147	//g_print("eval apply do\n");
	148	eval_ast(_slice(ast, 1, _count(ast)-1), env);
	149	ast = _last(ast);
	150	// Continue loop
	151	} else if ((a0->type & MAL_SYMBOL) &&
	152	strcmp("if", a0->val.string) == 0) {
	153	//g_print("eval apply if\n");
	154	MalVal *a1 = _nth(ast, 1);
	155	MalVal *cond = EVAL(a1, env);
	156	if (!cond \|\| mal_error) return NULL;
	157	if (cond->type & (MAL_FALSE\|MAL_NIL)) {
	158	// eval false slot form
b8ee29b2 JM	159	if (ast->val.array->len > 3) {
	160	ast = _nth(ast, 3);
	161	} else {
8cb5cda4	162	return &mal_nil;
31690700	163	}
8cb5cda4 JM	164	} else {
	165	// eval true slot form
	166	ast = _nth(ast, 2);
	167	}
	168	// Continue loop
	169	} else if ((a0->type & MAL_SYMBOL) &&
	170	strcmp("fn*", a0->val.string) == 0) {
	171	//g_print("eval apply fn*\n");
	172	MalVal *mf = malval_new(MAL_FUNCTION_MAL, NULL);
	173	mf->val.func.evaluator = EVAL;
	174	mf->val.func.args = _nth(ast, 1);
	175	mf->val.func.body = _nth(ast, 2);
	176	mf->val.func.env = env;
	177	return mf;
	178	} else {
	179	//g_print("eval apply\n");
	180	MalVal *el = eval_ast(ast, env);
	181	if (!el \|\| mal_error) { return NULL; }
	182	MalVal *f = _first(el),
	183	*args = _rest(el);
	184	assert_type(f, MAL_FUNCTION_C\|MAL_FUNCTION_MAL,
	185	"cannot apply '%s'", _pr_str(f,1));
	186	if (f->type & MAL_FUNCTION_MAL) {
	187	ast = f->val.func.body;
	188	env = new_env(f->val.func.env, f->val.func.args, args);
31690700	189	// Continue loop
31690700	190	} else {
8cb5cda4	191	return _apply(f, args);
31690700 JM	192	}
31690700 JM	193	}
8cb5cda4 JM	194
8cb5cda4 JM	195	} // TCO while loop
31690700 JM	196	}
	197
	198	// print
	199	char PRINT(MalVal exp) {
	200	if (mal_error) {
	201	fprintf(stderr, "Error: %s\n", mal_error->val.string);
	202	malval_free(mal_error);
	203	mal_error = NULL;
	204	return NULL;
	205	}
	206	return _pr_str(exp,1);
	207	}
	208
	209	// repl
	210
	211	// read and eval
	212	MalVal RE(Env env, char prompt, char str) {
	213	MalVal ast, exp;
	214	ast = READ(prompt, str);
	215	if (!ast \|\| mal_error) return NULL;
	216	exp = EVAL(ast, env);
	217	if (ast != exp) {
	218	malval_free(ast); // Free input structure
	219	}
	220	return exp;
	221	}
	222
	223	// Setup the initial REPL environment
	224	Env *repl_env;
	225
86b689f3	226	void init_repl_env(int argc, char *argv[]) {
31690700 JM	227	repl_env = new_env(NULL, NULL, NULL);
31690700 JM	228
8cb5cda4	229	// core.c: defined using C
31690700	230	int i;
86b689f3	231	for(i=0; i < (sizeof(core_ns) / sizeof(core_ns[0])); i++) {
b8ee29b2 JM	232	env_set(repl_env,
b8ee29b2 JM	233	malval_new_symbol(core_ns[i].name),
8cb5cda4	234	malval_new_function(core_ns[i].func, core_ns[i].arg_cnt));
31690700	235	}
8cb5cda4	236	MalVal do_eval(MalVal ast) { return EVAL(ast, repl_env); }
b8ee29b2 JM	237	env_set(repl_env,
b8ee29b2 JM	238	malval_new_symbol("eval"),
8cb5cda4	239	malval_new_function((void()(void *))do_eval, 1));
31690700	240
86b689f3 JM	241	MalVal *_argv = _listX(0);
	242	for (i=2; i < argc; i++) {
	243	MalVal *arg = malval_new_string(argv[i]);
	244	g_array_append_val(_argv->val.array, arg);
	245	}
b8ee29b2	246	env_set(repl_env, malval_new_symbol("ARGV"), _argv);
86b689f3	247
8cb5cda4	248	// core.mal: defined using the language itself
31690700 JM	249	RE(repl_env, "", "(def! not (fn* (a) (if a false true)))");
31690700 JM	250	RE(repl_env, "",
1617910a	251	"(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))");
31690700 JM	252	}
	253
	254	int main(int argc, char *argv[])
	255	{
	256	MalVal *exp;
	257	char *output;
	258	char prompt[100];
	259
	260	// Set the initial prompt and environment
	261	snprintf(prompt, sizeof(prompt), "user> ");
86b689f3	262	init_repl_env(argc, argv);
31690700 JM	263
	264	if (argc > 1) {
	265	char *cmd = g_strdup_printf("(load-file \"%s\")", argv[1]);
	266	RE(repl_env, "", cmd);
8cb5cda4 JM	267	return 0;
8cb5cda4 JM	268	}
31690700	269
86b689f3	270	// repl loop
8cb5cda4 JM	271	for(;;) {
	272	exp = RE(repl_env, prompt, NULL);
	273	if (mal_error && strcmp("EOF", mal_error->val.string) == 0) {
	274	return 0;
	275	}
	276	output = PRINT(exp);
31690700	277
8cb5cda4 JM	278	if (output) {
	279	g_print("%s\n", output);
	280	free(output); // Free output string
31690700	281	}
8cb5cda4 JM	282
8cb5cda4 JM	283	//malval_free(exp); // Free evaluated expression
31690700 JM	284	}
31690700 JM	285	}