stage1 重构代码 语法上重新实现解包语法

stage1/spl_parser.h

@@ -0,0 +1,21 @@
+#ifndef __SPL_PARSER_H__
+#define __SPL_PARSER_H__
+
+#include "spl_ast.h"
+#include "spl_diag.h"
+
+typedef struct spl_parser {
+    spl_ast_t *ast;
+    spl_diag_t *diag;
+    usize pos;
+    int failed;
+    int stop_agg;
+    usize error_count;
+} spl_parser_t;
+
+void spl_parser_init(spl_parser_t *p);
+void spl_parser_drop(spl_parser_t *p);
+
+void spl_ast_parse(spl_parser_t *p, spl_ast_t *ast);
+
+#endif /* __SPL_PARSER_H__ */