namespaces: Add a namespace structure that represents a file

We have been always parsing a single function. Since we want to have
multiple functions in a near future, this patch introduces an namespace
that represents an entire file.

To ensure a function is defined inside a namespace, a helper function
was created. Today our ast_node structure is highly exposed, and this is
something that Johnny and I have been discussed. So then, this is a
first step to try to protected the code generation from our ast tree.

Signed-off-by: Carlos Maniero <carlos@maniero.me>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/parser.c b/src/parser.c
index e3f157f..b94087f 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -571,6 +571,22 @@ is_next_statement_return(parser_t *parser)
 }
 
 static bool
+is_next_function_declaration(parser_t *parser)
+{
+  token_t token;
+  lexer_peek_next_token(parser->lexer, &token);
+  return token.kind == TOKEN_KEYWORD_FN;
+}
+
+static bool
+is_next_token_eof(parser_t *parser)
+{
+  token_t token;
+  lexer_peek_next_token(parser->lexer, &token);
+  return token.kind == TOKEN_EOF;
+}
+
+static bool
 is_block_end(parser_t *parser)
 {
   token_t token;
@@ -746,3 +762,24 @@ parser_parse_function_declaration(parser_t *parser)
 
   return node;
 }
+
+ast_node_t *
+parser_parse_ns(parser_t *parser)
+{
+  vector_t *nodes = vector_new();
+
+  while (!is_next_token_eof(parser)) {
+    if (is_next_function_declaration(parser)) {
+      ast_node_t *node = parser_parse_function_declaration(parser);
+
+      if (node == NULL) {
+        ast_node_destroy_vector(nodes);
+        return NULL;
+      }
+
+      vector_push_back(nodes, node);
+    }
+  }
+
+  return ast_node_new_namespace(nodes);
+}