parser: Create parser for function with return statements

This is a very limited parser implementation which parses a single
function with return type i32 and body containing a return number statement.

The parser doesn't show the 'filepath:row:col' when it fails, a future
improvement would be display it to easy find where the compilation
problem is located.

The ast_nodes are taking the token.value ownership (which is a really
bad design since not all token.value ownership has been taken causing
memory leaking) but we never free them.  For a future fix we could use a
string_view instead since we never change the original source code. The
string_view will also improve the performance a lot avoiding unnecessary
heap memory allocation.

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/lexer.c b/src/lexer.c
index 14165ae..0327ad5 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -198,3 +198,30 @@ lexer_current_char(lexer_t *lexer)
   return lexer->src[lexer->cur];
 }
 
+char *
+token_kind_to_str(token_kind_t kind)
+{
+  switch (kind) {
+    case TOKEN_NAME:
+      return "TOKEN_NAME";
+    case TOKEN_OPAREN:
+      return "(";
+    case TOKEN_CPAREN:
+      return ")";
+    case TOKEN_COLON:
+      return ":";
+    case TOKEN_SEMICOLON:
+      return ";";
+    case TOKEN_OCURLY:
+      return "{";
+    case TOKEN_CCURLY:
+      return "}";
+    case TOKEN_NUMBER:
+      return "TOKEN_NUMBER";
+    case TOKEN_EOF:
+      return "TOKEN_EOF";
+    default:
+      return "UNKNOW_TOKEN";
+  }
+}
+