libropkg: implement package list expression parsing

libropkg/pkg-expr.h

@@ -0,0 +1,29 @@
+#ifndef _PKG_EXPR_H_
+#define _PKG_EXPR_H_
+
+#include <ropkg/pkg-expr.h>
+#include <ropkg/version.h>
+
+struct ropkg_pkg_expr {
+	enum ropkg_pkg_expr_type expr_type;
+	b_queue_entry expr_entry;
+};
+
+struct ropkg_pkg_expr_pkg {
+	struct ropkg_pkg_expr pkg_base;
+	char *pkg_name;
+	enum ropkg_comparison_op pkg_version_predicate;
+	struct ropkg_version *pkg_version;
+};
+
+struct ropkg_pkg_expr_and {
+	struct ropkg_pkg_expr and_base;
+	struct ropkg_pkg_expr *and_left, *and_right;
+};
+
+struct ropkg_pkg_expr_or {
+	struct ropkg_pkg_expr or_base;
+	struct ropkg_pkg_expr *or_left, *or_right;
+};
+
+#endif