Initial support for loading dependency info from buildfiles

Also a new iteration on the overall architecture. Now, for the first time,
build can read the buildfile and build itself.

g++-4.9 -std=c++14 -g -I.. -o bd bd.cxx algorithm.cxx scope.cxx parser.cxx lexer.cxx target.cxx prerequisite.cxx rule.cxx native.cxx cxx/target.cxx cxx/rule.cxx process.cxx timestamp.cxx path.cxx

g++-4.9 -std=c++14 -g -I../../.. -o driver driver.cxx ../../../build/lexer.cxx

g++-4.9 -std=c++14 -g -I../../.. -o driver driver.cxx ../../../build/lexer.cxx ../../../build/parser.cxx ../../../build/scope.cxx ../../../build/target.cxx ../../../build/native.cxx ../../../build/prerequisite.cxx ../../../build/path.cxx ../../../build/timestamp.cxx

1 files changed, 93 insertions, 0 deletions

diff --git a/build/algorithm.cxx b/build/algorithm.cxx
new file mode 100644
index 0000000..fac0bf6
--- /dev/null
+++ b/build/algorithm.cxx
@@ -0,0 +1,93 @@
+// file      : build/algorithm.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <build/algorithm>
+
+#include <memory>   // unique_ptr
+#include <utility>  // move
+#include <cassert>
+#include <iostream>
+
+#include <build/path>
+#include <build/scope>
+#include <build/target>
+#include <build/prerequisite>
+#include <build/rule>
+#include <build/diagnostics>
+
+using namespace std;
+
+namespace build
+{
+  target*
+  search (prerequisite& p)
+  {
+    assert (p.target == nullptr);
+
+    //@@ TODO for now we just default to the directory scope.
+    //
+    path d;
+    if (p.directory.absolute ())
+      d = p.directory; // Already normalized.
+    else
+    {
+      d = p.scope.path () / p.directory;
+      d.normalize ();
+    }
+
+    //@@ TODO would be nice to first check if this target is
+    //   already in the set before allocating a new instance.
+
+    // Find or insert.
+    //
+    auto r (
+      targets.emplace (
+        unique_ptr<target> (p.type.factory (p.name, move (d)))));
+
+    //if (r.second)
+    //  cout << "new target for prerequsite " << p << " " << d << endl;
+
+    return (p.target = r.first->get ());
+  }
+
+  bool
+  match (target& t)
+  {
+    assert (!t.recipe ());
+
+    for (auto tt (&t.type ());
+         tt != nullptr && !t.recipe ();
+         tt = tt->base)
+    {
+      for (auto rs (rules.equal_range (tt->id));
+           rs.first != rs.second;
+           ++rs.first)
+      {
+        const rule& ru (rs.first->second);
+
+        recipe re;
+
+        {
+          auto g (
+            make_exception_guard (
+              [] (target& t)
+              {
+                cerr << "info: while matching a rule for target " << t << endl;
+              },
+              t));
+
+          re = ru.match (t);
+        }
+
+        if (re)
+        {
+          t.recipe (re);
+          break;
+        }
+      }
+    }
+
+    return bool (t.recipe ());
+  }
+}