Support for scope parents, initial variable support

8 files changed, 113 insertions, 19 deletions

diff --git a/build/algorithm.cxx b/build/algorithm.cxx
index d418cda..16bc1bc 100644
--- a/build/algorithm.cxx
+++ b/build/algorithm.cxx
@@ -47,7 +47,7 @@ namespace build
       const auto& rules (i->second); // Hint map.
 
       string hint; // @@ TODO
-      auto rs (rules.find (hint));
+      auto rs (rules.find_prefix (hint));
 
       for (auto i (rs.first); i != rs.second; ++i)
       {
diff --git a/build/context b/build/context
index 4f5b029..c177603 100644
--- a/build/context
+++ b/build/context
@@ -21,9 +21,6 @@ namespace build
   extern path src_base;
   extern path out_base;
 
-  class scope;
-  extern scope* root_scope;
-
   // Return the src/out directory corresponding to the given out/src. The
   // passed directory should be a sub-directory of out/src_root.
   //
diff --git a/build/context.cxx b/build/context.cxx
index a298d41..79753ec 100644
--- a/build/context.cxx
+++ b/build/context.cxx
@@ -20,8 +20,6 @@ namespace build
   path src_base;
   path out_base;
 
-  scope* root_scope;
-
   path
   src_out (const path& o)
   {
diff --git a/build/prefix-map b/build/prefix-map
index 1b00337..d98c842 100644
--- a/build/prefix-map
+++ b/build/prefix-map
@@ -108,10 +108,10 @@ namespace build
       : map_type (std::move (init), compare_type (delimiter)) {}
 
     std::pair<iterator, iterator>
-    find (const key_type&);
+    find_prefix (const key_type&);
 
     std::pair<const_iterator, const_iterator>
-    find (const key_type&) const;
+    find_prefix (const key_type&) const;
   };
 
   template <typename M, typename prefix_map_common<M>::char_type D = 0>
diff --git a/build/prefix-map.txx b/build/prefix-map.txx
index 0da911d..a8bf028 100644
--- a/build/prefix-map.txx
+++ b/build/prefix-map.txx
@@ -6,7 +6,7 @@ namespace build
 {
   template <typename M>
   auto prefix_map_common<M>::
-  find (const key_type& k) -> std::pair<iterator, iterator>
+  find_prefix (const key_type& k) -> std::pair<iterator, iterator>
   {
     std::pair<iterator, iterator> r;
     r.first = this->lower_bound (k);
@@ -24,7 +24,8 @@ namespace build
 
   template <typename M>
   auto prefix_map_common<M>::
-  find (const key_type& k) const -> std::pair<const_iterator, const_iterator>
+  find_prefix (const key_type& k) const ->
+    std::pair<const_iterator, const_iterator>
   {
     std::pair<const_iterator, const_iterator> r;
     r.first = this->lower_bound (k);
diff --git a/build/scope b/build/scope
index 58f7933..6d96b0a 100644
--- a/build/scope
+++ b/build/scope
@@ -7,6 +7,7 @@
 
 #include <build/path>
 #include <build/path-map>
+#include <build/variable>
 #include <build/prerequisite>
 
 namespace build
@@ -19,6 +20,9 @@ namespace build
     const path_type&
     path () const {return i_->first;} // Absolute and normalized.
 
+    scope&
+    parent () const {return *parent_;}
+
   private:
     friend class scope_map;
 
@@ -27,32 +31,41 @@ namespace build
     scope () = default;
 
     void
-    init (const iterator& i) {i_ = i;}
+    init (const iterator& i, scope* p) {i_ = i; parent_ = p;}
+
+    void
+    parent (scope& p) {parent_ = &p;}
 
   public:
+    variable_map variables;
     prerequisite_set prerequisites;
 
   private:
     iterator i_;
+    scope* parent_;
   };
 
   class scope_map: path_map<scope>
   {
   public:
+    // Note that we assume the first insertion into the map is that
+    // of the root scope.
+    //
+
     scope&
-    operator[] (const path& k)
-    {
-      auto i (emplace (k, scope ()));
-      auto& r (i.first->second);
+    operator[] (const path&);
 
-      if (i.second)
-        r.init (i.first);
+    // Find the most qualified scope that encompasses this path.
+    //
+    scope&
+    find (const path&);
 
-      return r;
-    }
+  private:
+    typedef path_map<scope> base;
   };
 
   extern scope_map scopes;
+  extern scope* root_scope;
 }
 
 #endif // BUILD_SCOPE
diff --git a/build/scope.cxx b/build/scope.cxx
index 0f99b0e..7165663 100644
--- a/build/scope.cxx
+++ b/build/scope.cxx
@@ -9,4 +9,70 @@ using namespace std;
 namespace build
 {
   scope_map scopes;
+  scope* root_scope;
+
+  scope& scope_map::
+  operator[] (const path& k)
+  {
+    auto er (emplace (k, scope ()));
+    scope& s (er.first->second);
+
+    if (er.second)
+    {
+      scope* p (nullptr);
+
+      // Update scopes of which we are a new parent.
+      //
+      for (auto r (find_prefix (k)); r.first != r.second; ++r.first)
+      {
+        scope& c (r.first->second);
+
+        // The first scope of which we are a parent is the least
+        // (shortest) one which means there is no other scope
+        // between it and our parent.
+        //
+        if (p == nullptr)
+          p = &c;
+        else if (p != &c) // A scope with an intermediate parent.
+          continue;
+
+        c.parent (s);
+      }
+
+      // We couldn't get the parent from one of its old children
+      // so we have to find it ourselves (unless this is is the
+      // root scope).
+      //
+      if (p == nullptr && size () != 1)
+        p = &find (k);
+
+      s.init (er.first, p);
+    }
+
+    return s;
+  }
+
+  // Find the most qualified scope that encompasses this path.
+  //
+  scope& scope_map::
+  find (const path& k)
+  {
+    // Normally we would have a scope for the full path so try
+    // that before making any copies.
+    //
+    auto i (base::find (k));
+
+    if (i != end ())
+      return i->second;
+
+    for (path d (k.directory ());; d = d.directory ())
+    {
+      auto i (base::find (k));
+
+      if (i != end ())
+        return i->second;
+
+      assert (d.empty ()); // We should have the root scope.
+    }
+  }
 }
diff --git a/build/variable b/build/variable
new file mode 100644
index 0000000..caceb2b
--- /dev/null
+++ b/build/variable
@@ -0,0 +1,19 @@
+// file      : build/variable -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BUILD_VARIABLE
+#define BUILD_VARIABLE
+
+#include <build/prefix-map>
+
+namespace build
+{
+  // @@ TODO:
+  // - pool names?
+  //
+
+  typedef prefix_map<std::string, std::string, '.'> variable_map;
+}
+
+#endif // BUILD_VARIABLE