From 13923af3ab57dbd826ce6f36b38228eea595590f Mon Sep 17 00:00:00 2001
From: Quinn Stephens <quinn@osmora.org>
Date: Mon, 9 Jun 2025 22:02:58 -0400
Subject: parser: Parse uninitialized variable declarations

Signed-off-by: Quinn Stephens <quinn@osmora.org>
---
 include/parser/ast.h |  3 ++-
 src/main.c           | 10 +++++++++-
 src/parser/parser.c  | 21 +++++++++++++++++----
 3 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/include/parser/ast.h b/include/parser/ast.h
index 3449764..d4baf92 100644
--- a/include/parser/ast.h
+++ b/include/parser/ast.h
@@ -37,7 +37,8 @@
 enum ast_node_kind {
     NOK_UNKNOWN,
 
-    NOK_FUNCTION
+    NOK_FUNCTION,
+    NOK_VARIABLE
 };
 
 struct ast_node {
diff --git a/src/main.c b/src/main.c
index 645656c..c06d83e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -33,7 +33,7 @@
 #include "parser.h"
 #include "parser/ast.h"
 
-static const char *src = "void test();\nint main();";
+static const char *src = "int x;\nvoid test();\nint main();\n";
 
 static void
 print_func(struct ast_node *func)
@@ -41,6 +41,12 @@ print_func(struct ast_node *func)
     log_debug("found function \"%.*s\" (return type %s)\n", func->name_len, func->name, func->type->name);
 }
 
+static void
+print_var(struct ast_node *var)
+{
+    log_debug("found variable \"%.*s\" (type %s)\n", var->name_len, var->name, var->type->name);
+}
+
 static void
 print_syms(struct hashmap *syms)
 {
@@ -55,6 +61,8 @@ print_syms(struct hashmap *syms)
         while (node != (struct ast_node *)list) {
             if (node->kind == NOK_FUNCTION) {
                 print_func(node);
+            } else if (node->kind == NOK_VARIABLE) {
+                print_var(node);
             }
 
             node = (struct ast_node *)node->hashmap_entry.list_entry.next;
diff --git a/src/parser/parser.c b/src/parser/parser.c
index 4f8543c..ccdc037 100644
--- a/src/parser/parser.c
+++ b/src/parser/parser.c
@@ -78,6 +78,20 @@ parse_func_decl(struct parser *ctx, struct ast_node *func)
     return true;
 }
 
+static bool
+parse_var_decl(struct parser *ctx, struct ast_node *var)
+{
+    var->kind = NOK_VARIABLE;
+
+    /*
+     * TODO: Parse initial value.
+     */
+
+    hashmap_add(ctx->syms, &var->hashmap_entry);
+    parser_advance(ctx);
+    return true;
+}
+
 static bool
 parse_decl(struct parser *ctx)
 {
@@ -118,12 +132,11 @@ parse_decl(struct parser *ctx)
     parser_advance(ctx);
     if (ctx->tok.kind == TOK_LPAREN) {
         return parse_func_decl(ctx, node);
+    } else if (ctx->tok.kind == TOK_SEMICOLON) {
+        return parse_var_decl(ctx, node);
     }
 
-    /*
-     * TODO: Parse variable declarations.
-     */
-    tok_error(&ctx->tok, "expected \"(\" after identifier\n");
+    tok_error(&ctx->tok, "expected \"(\" or \";\" after identifier\n");
     free(node);
     return false;
 }
-- 
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