parser: Get started on type system

Signed-off-by: Quinn Stephens <quinn@osmora.org>

3 files changed, 69 insertions, 9 deletions

diff --git a/src/main.c b/src/main.c
index c42239d..a45f33b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -32,7 +32,7 @@
 #include "log.h"
 #include "parser.h"
 
-static const char *src = "int test\nint main";
+static const char *src = "void test\nint main";
 
 int
 main(int argc, char **argv)
diff --git a/src/parser/parser.c b/src/parser/parser.c
index 065bb32..041422e 100644
--- a/src/parser/parser.c
+++ b/src/parser/parser.c
@@ -32,6 +32,7 @@
 #include "lexer.h"
 #include "log.h"
 #include "parser.h"
+#include "parser/types.h"
 
 static void
 tok_error(struct token *tok, const char *fmt, ...)
@@ -47,21 +48,28 @@ tok_error(struct token *tok, const char *fmt, ...)
 static bool
 parse_declaration(struct lexer *lexer, struct token *tok)
 {
+    struct type *typ;
+
     /*
-     * TODO: Support more types.
+     * TODO: Support custom types.
      */
-    if (tok->kind != TK_VOID && tok->kind != TK_INT) {
-        tok_error(tok, "expected \"void\" or \"int\"\n");
+    if (!(tok->flags & TF_BUILTIN_TYPE)) {
+        tok_error(tok, "expected built-in type\n");
+        return false;
+    }
+
+    typ = types_find_builtin(tok->kind);
+    if (typ == NULL) {
         return false;
     }
 
     lexer_next(lexer, tok);
-    if (tok->kind != TK_IDENTIFIER) {
+    if (tok->kind != TOK_IDENTIFIER) {
         tok_error(tok, "expected identifier\n");
         return false;
     }
 
-    log_debug("Parsed declaration of \"%.*s\"\n", tok->len, tok->pos);
+    log_debug("name: \"%.*s\", type: { name: \"%s\", size: %lu }\n", tok->len, tok->pos, typ->name, typ->size);
 
     lexer_next(lexer, tok);
     return true;
@@ -80,13 +88,13 @@ parser_parse(struct lexer *lexer)
         return false;
     }
 
-    while (tok.kind != TK_EOF) {
-        if (tok.kind == TK_UNKNOWN) {
+    while (tok.kind != TOK_EOF) {
+        if (tok.kind == TOK_UNKNOWN) {
             tok_error(&tok, "unrecognized token\n");
             return false;
         }
 
-        if ((tok.flags & TF_BUILTIN_TYPE) || tok.kind == TK_IDENTIFIER) {
+        if ((tok.flags & TF_BUILTIN_TYPE) || tok.kind == TOK_IDENTIFIER) {
             success = parse_declaration(lexer, &tok);
         }
 
diff --git a/src/parser/types.c b/src/parser/types.c
new file mode 100644
index 0000000..ba0c256
--- /dev/null
+++ b/src/parser/types.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2025 Quinn Stephens and the OSMORA team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "log.h"
+#include "parser/types.h"
+
+#define BUILTIN_TYPE_COUNT 2
+
+static struct type builtin_types[BUILTIN_TYPE_COUNT] = {
+    { .kind = TYK_BUILTIN, .name = "void", .size = 0 },
+    { .kind = TYK_BUILTIN, .name = "int" , .size = 4 }
+};
+
+struct type *
+types_find_builtin(enum token_kind tok_kind)
+{
+    int idx;
+
+    idx = tok_kind - TOK_VOID;
+    if (idx < 0 || idx >= BUILTIN_TYPE_COUNT) {
+        log_error("token kind does not match any builtin type\n");
+        return NULL;
+    }
+
+    return &builtin_types[idx];
+}