Add ability to customize in::rule's default symbol and mode

2 files changed, 8 insertions, 3 deletions

diff --git a/build2/in/rule.cxx b/build2/in/rule.cxx
index 5988566..1495c64 100644
--- a/build2/in/rule.cxx
+++ b/build2/in/rule.cxx
@@ -146,7 +146,7 @@ namespace build2
 
       // Substitution symbol.
       //
-      char sym ('$');
+      char sym (symbol_);
       if (const string* s = cast_null<string> (t["in.symbol"]))
       {
         if (s->size () == 1)
@@ -157,7 +157,7 @@ namespace build2
 
       // Substitution mode.
       //
-      bool strict (true);
+      bool strict (strict_);
       if (const string* s = cast_null<string> (t["in.substitution"]))
       {
         if (*s == "lax")
diff --git a/build2/in/rule.hxx b/build2/in/rule.hxx
index e588fd9f..a68e80c 100644
--- a/build2/in/rule.hxx
+++ b/build2/in/rule.hxx
@@ -19,7 +19,8 @@ namespace build2
     class rule: public build2::rule
     {
     public:
-      rule () {}
+      rule (char symbol = '$', bool strict = true)
+          : symbol_ (symbol), strict_ (strict) {}
 
       virtual bool
       match (action, target&, const string&) const override;
@@ -43,6 +44,10 @@ namespace build2
 
       target_state
       perform_update (action, const target&) const;
+
+    protected:
+      char symbol_;
+      bool strict_;
     };
   }
 }