Add support for 'while' loop in script

1 files changed, 10 insertions, 0 deletions

diff --git a/libbuild2/script/script.hxx b/libbuild2/script/script.hxx
index 5a39659..d6018f0 100644
--- a/libbuild2/script/script.hxx
+++ b/libbuild2/script/script.hxx
@@ -27,6 +27,7 @@ namespace build2
       cmd_elif,
       cmd_elifn,
       cmd_else,
+      cmd_while,
       cmd_end
     };
 
@@ -380,6 +381,15 @@ namespace build2
     ostream&
     operator<< (ostream&, const command_expr&);
 
+    // Stack-allocated linked list of iteration indexes of the nested loops.
+    //
+    struct iteration_index
+    {
+      size_t index; // 1-based.
+
+      const iteration_index* prev; // NULL for the top-most loop.
+    };
+
     struct timeout
     {
       duration value;