From 6535bf6175af32e2514faf75d2742424751a783b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 15 Apr 2015 14:10:50 +0200
Subject: New variables architecture

Now operator[] is only used for lookup.
---
 build/scope.cxx | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

(limited to 'build/scope.cxx')

diff --git a/build/scope.cxx b/build/scope.cxx
index 6fb32b1..4503c6d 100644
--- a/build/scope.cxx
+++ b/build/scope.cxx
@@ -11,18 +11,35 @@ namespace build
   // scope
   //
   value_proxy scope::
-  operator[] (const variable& var)
+  operator[] (const variable& var) const
   {
-    for (scope* s (this); s != nullptr; s = s->parent_scope ())
+    for (const scope* s (this); s != nullptr; s = s->parent_scope ())
     {
-      auto i (s->variables.find (var));
-      if (i != s->variables.end ())
-        return value_proxy (&i->second, s);
+      auto i (s->vars.find (var));
+      if (i != s->vars.end ())
+        // @@ Same issue as in variable_map: need ro_value_proxy.
+        return value_proxy (&const_cast<value_ptr&> (i->second), &s->vars);
     }
 
     return value_proxy (nullptr, nullptr);
   }
 
+  value_proxy scope::
+  append (const variable& var)
+  {
+    value_proxy val (operator[] (var));
+
+    if (val && val.belongs (*this)) // Existing variable in this scope.
+      return val;
+
+    value_proxy r (assign (var));
+
+    if (val)
+      r = val; // Copy value from the outer scope.
+
+    return r;
+  }
+
   // scope_map
   //
   scope_map scopes;
-- 
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