Add simple evaluation

src/evaluate.c

@@ -2,26 +2,48 @@
 #include <stddef.h>
 
 #include "nihilispm.h"
+#include "nihilispm_internal.h"
+#include "nihilispm_utility.h"
+#include "nihilispm_state.h"
 
-struct nl_object *nl_evaluate_list(struct nl_object *list) {
-    return NULL;
+struct nl_object *nl_evaluate_list(struct nl_state *state, struct nl_object *list) {
+    // TODO: Recursively eval args
+    struct nl_object *evaluated_list = nl_nil_create();
+
+    FOREACH_LIST(list, iter, item) {
+        struct nl_object *obj = nl_evaluate(state, item);
+        nl_list_append(evaluated_list, obj);
+    };
+
+    struct nl_object *fun = nl_car(evaluated_list);
+    struct nl_object *args = nl_cdr(evaluated_list);
+    struct nl_object *result = NULL;
+
+    assert(fun->type == NL_TYPE_BUILTIN);
+    if (fun->type == NL_TYPE_BUILTIN) {
+        result = fun->builtin(args);
+    }
+
+    // TODO: Non-builtins
+
+    // TODO: cleanup
+
+    return result;
 }
 
-struct nl_object *nl_evaluate_symbol(struct nl_object *symbol) {
-    return NULL;
-}
-
-struct nl_object *nl_evaluate(struct nl_object *obj) {
+struct nl_object *nl_evaluate(struct nl_state *state, struct nl_object *obj) {
     assert(obj != NULL);
 
     switch (obj->type) {
         case NL_TYPE_CELL:
-            return nl_evaluate_list(obj);
+            return nl_evaluate_list(state, obj);
         case NL_TYPE_SYMBOL:
-            return NULL; //nl_evalute_symbol(obj);
+            return nl_state_get(state, obj->symbol);
         case NL_TYPE_INT:
         case NL_TYPE_STRING:
+        case NL_TYPE_ERROR:
             return obj;
+        case NL_TYPE_BUILTIN:
         case NL_TYPE_COUNT:
             assert(0);
             return NULL;

src/main.c

@@ -1,10 +1,29 @@
+#include <assert.h>
 #include <stdio.h>
+
 #include "nihilispm.h"
 #include "nihilispm_state.h"
+#include "nihilispm_internal.h"
+#include "nihilispm_utility.h"
+#include "builtins.h"
 
 int main(int argc, const char **argv) {
     (void) argc, (void) argv;
     struct nl_state *state = nl_state_create();
 
+    nl_state_put(state, "+", nl_builtin_create(nl_builtin_add));
+    nl_state_put(state, "-", nl_builtin_create(nl_builtin_sub));
+    nl_state_put(state, "*", nl_builtin_create(nl_builtin_mul));
+    nl_state_put(state, "/", nl_builtin_create(nl_builtin_div));
+    nl_state_put(state, "%", nl_builtin_create(nl_builtin_mod));
+
+    struct nl_object *sexp = nl_parse(argv[1]);
+    struct nl_object *result = nl_evaluate(state, nl_car(sexp));
+
+    assert(result != NULL);
+    assert(result->type == NL_TYPE_INT);
+
+    printf("%d\n", result->integer);
+
     return 0;
 }

src/memory.c

@@ -48,6 +48,15 @@ struct nl_object *nl_error_create(const char *error)
     return obj;
 }
 
+
+struct nl_object *nl_builtin_create(nl_builtin builtin)
+{
+    struct nl_object* obj = nl_object_alloc();
+    obj->type = NL_TYPE_BUILTIN;
+    obj->builtin = builtin;
+    return obj;
+}
+
 static struct nl_object* nl_object_alloc() {
     return malloc(sizeof(struct nl_object));
 }
@@ -77,6 +86,7 @@ void nl_object_delete(struct nl_object *obj) {
             obj->error = NULL;
             break;
         case NL_TYPE_INT:
+        case NL_TYPE_BUILTIN:
         case NL_TYPE_COUNT:
             break;
     }

src/nihilispm.h

@@ -7,7 +7,8 @@ enum nl_type {
     NL_TYPE_INT = 2,
     NL_TYPE_STRING = 3,
     NL_TYPE_ERROR = 4,
-    NL_TYPE_COUNT = 5,
+    NL_TYPE_BUILTIN = 5,
+    NL_TYPE_COUNT = 6,
 };
 
 struct nl_cell {
@@ -15,6 +16,8 @@ struct nl_cell {
     struct nl_object *cdr;
 };
 
+typedef struct nl_object *(*nl_builtin)(struct nl_object *args);
+
 struct nl_object {
     enum nl_type type;
     union {
@@ -23,6 +26,7 @@ struct nl_object {
         int integer;
         const char *string;
         const char *error;
+        nl_builtin builtin;
     };
 };
 
@@ -37,6 +41,6 @@ struct nl_state; // TODO
 
 struct nl_object *nl_tokenize(const char *source);
 struct nl_object *nl_parse(const char *sexp);
-struct nl_object *nl_evaluate(struct nl_object *sexp);
+struct nl_object *nl_evaluate(struct nl_state *state, struct nl_object *sexp);
 
 #endif

src/nihilispm_internal.h

@@ -10,12 +10,12 @@
          item_name != NULL && iter_name != NULL && (cond); \
          iter_name = iter_name->cell.cdr, item_name = (iter_name == NULL) ? NULL : iter_name->cell.car)
 
-
 struct nl_object *nl_cell_create(struct nl_object *car, struct nl_object *cdr);
 struct nl_object *nl_int_create(int integer);
 struct nl_object *nl_symbol_create(const char* symbol);
 struct nl_object *nl_string_create(const char* string);
 struct nl_object *nl_error_create(const char* error);
+struct nl_object *nl_builtin_create(nl_builtin builtin);
 
 void nl_object_delete(struct nl_object *obj);
 

src/parse.c

@@ -67,8 +67,12 @@ struct nl_object *nl_token_next(const char **curr_src) {
                 // -2 for removing start/end quotes
                 str = strndup(start + 1, *curr_src - start - 2);
                 return nl_cell_create(nl_string_create(str), NULL);
-            //case '0':
-                // TODO: Parse integers
+            case '0'...'9': {
+                char *end = NULL;
+                long value = strtol(*curr_src, &end, 0);
+                *curr_src = end;
+                return nl_cell_create(nl_int_create(value), NULL);
+            }
             default:
                 while (!nl_is_delimiter(**curr_src)) {
                     (*curr_src)++;
@@ -116,8 +120,7 @@ struct nl_object *nl_parse_token_atom(struct nl_object *maybe_atom) {
             atom = nl_string_create(strdup(maybe_atom->string));
             break;
         case NL_TYPE_INT:
-            // TODO: Copy the token
-            assert(0);
+            atom = nl_int_create(maybe_atom->integer);
             break;
         case NL_TYPE_COUNT:
             assert(false);
@@ -152,7 +155,7 @@ static struct nl_object *nl_parse_tokens_recursive(struct nl_object **token_iter
         *token_iter = (*token_iter)->cell.cdr;
         while (1) {
             token = (*token_iter)->cell.car;
-            if (token->symbol[0] == END_LIST_CHAR) {
+            if (token->type == NL_TYPE_SYMBOL && token->symbol[0] == END_LIST_CHAR) {
                 *token_iter = (*token_iter)->cell.cdr;
                 if (list == NULL) {
                     list = nl_cell_create(NULL, NULL);