lang: replace stack-based parser with a recursive parser

lang/parse/operator.c

@@ -0,0 +1,43 @@
+#include "ctx.h"
+
+#include <ivy/lang/ast.h>
+#include <ivy/lang/operator.h>
+
+const struct ivy_operator *get_operator_from_token(struct ivy_token *tok)
+{
+	switch (tok->t_type) {
+	case IVY_TOK_SYMBOL:
+		return ivy_operator_get_by_token(tok->t_symbol);
+	case IVY_TOK_KEYWORD:
+		return ivy_operator_get_by_token(tok->t_keyword);
+	default:
+		return ivy_operator_get_by_token(tok->t_type);
+	}
+}
+
+struct ivy_ast_node *create_operator_node_from_token(struct ivy_token *tok)
+{
+	const struct ivy_operator *op = get_operator_from_token(tok);
+	if (!op) {
+		return NULL;
+	}
+
+	struct ivy_ast_op_node *op_node = create_node(IVY_AST_OP);
+	op_node->n_op = op;
+	ivy_ast_node_set_bounds_from_token(generic_node(op_node), tok);
+	return generic_node(op_node);
+}
+
+const struct ivy_operator *get_operator_from_node(struct ivy_ast_node *n)
+{
+	switch (n->n_type) {
+	case IVY_AST_OP: {
+		struct ivy_ast_op_node *op = (struct ivy_ast_op_node *)n;
+		return op->n_op;
+	}
+	case IVY_AST_MSG:
+		return ivy_operator_get_by_id(IVY_OP_MSG);
+	default:
+		return NULL;
+	}
+}