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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "types.h"
#include "readline.h"
#include "reader.h"
// Declarations
MalVal *EVAL(MalVal *ast, GHashTable *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
MalVal *eval_ast(MalVal *ast, GHashTable *env) {
if (!ast || mal_error) return NULL;
if (ast->type == MAL_SYMBOL) {
//g_print("EVAL symbol: %s\n", ast->val.string);
// TODO: check if not found
return g_hash_table_lookup(env, ast->val.string);
} 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, GHashTable *env) {
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));
if (_count(ast) == 0) { return ast; }
MalVal *a0 = _nth(ast, 0);
assert_type(a0, MAL_SYMBOL, "Cannot invoke %s", _pr_str(a0,1));
MalVal *el = eval_ast(ast, env);
if (!el || mal_error) { return NULL; }
MalVal *(*f)(void *, void*) = (MalVal *(*)(void*, void*))_first(el);
//g_print("eval_invoke el: %s\n", _pr_str(el,1));
return f(_nth(el, 1), _nth(el, 2));
}
// 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(GHashTable *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
GHashTable *repl_env;
void init_repl_env() {
repl_env = g_hash_table_new(g_str_hash, g_str_equal);
WRAP_INTEGER_OP(plus,+)
WRAP_INTEGER_OP(minus,-)
WRAP_INTEGER_OP(multiply,*)
WRAP_INTEGER_OP(divide,/)
g_hash_table_insert(repl_env, "+", int_plus);
g_hash_table_insert(repl_env, "-", int_minus);
g_hash_table_insert(repl_env, "*", int_multiply);
g_hash_table_insert(repl_env, "/", int_divide);
}
int main()
{
MalVal *exp;
char *output;
char prompt[100];
// Set the initial prompt and environment
snprintf(prompt, sizeof(prompt), "user> ");
init_repl_env();
// 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
}
}
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