From 5e9eb843f6ccadfb47fa603260783425da9e7805 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 10 Dec 2014 10:20:26 +0200
Subject: Add rules

g++-4.9 -std=c++11 -g -I.. -o bd bd.cxx target.cxx native.cxx rule.cxx cxx/rule.cxx cxx/target.cxx process.cxx timestamp.cxx path.cxx
---
 build/rule.cxx | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 build/rule.cxx

(limited to 'build/rule.cxx')

diff --git a/build/rule.cxx b/build/rule.cxx
new file mode 100644
index 0000000..fe4c4b2
--- /dev/null
+++ b/build/rule.cxx
@@ -0,0 +1,72 @@
+// file      : build/rule.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#include <build/rule>
+
+#include <iostream>
+
+using namespace std;
+
+namespace build
+{
+  rule_map rules;
+
+  // default_path_rule
+  //
+  recipe default_path_rule::
+  match (target& t) const
+  {
+    // @@ TODO:
+    //
+    // - need to assign path somehow. Get (potentially several)
+    //   extensions from target type? Maybe target type should
+    //   generate a list of potential paths that we can try here.
+    //
+
+    path_target& pt (dynamic_cast<path_target&> (t));
+
+    return pt.mtime () != timestamp_nonexistent ? &update : nullptr;
+  }
+
+  target_state default_path_rule::
+  update (target& t)
+  {
+    // Make sure the target is not older than any of its prerequisites.
+    //
+    path_target& pt (dynamic_cast<path_target&> (t));
+    timestamp mt (pt.mtime ());
+
+    for (const target& p: t.prerequisites ())
+    {
+      // If this is an mtime-based target, then simply compare timestamps.
+      //
+      if (auto mtp = dynamic_cast<const mtime_target*> (&p))
+      {
+        if (mt < mtp->mtime ())
+        {
+          cerr << "error: no rule to update target " << t << endl
+               << "info: prerequisite " << p << " is ahead of " << t <<
+            " by " << (mtp->mtime () - mt) << endl;
+
+          return target_state::failed;
+        }
+      }
+      else
+      {
+        // Otherwise we assume the prerequisite is newer if it was updated.
+        //
+        if (p.state () == target_state::updated)
+        {
+          cerr << "error: no rule to update target " << t << endl
+               << "info: prerequisite " << p << " is ahead of " << t <<
+            " because it was updated" << endl;
+
+          return target_state::failed;
+        }
+      }
+    }
+
+    return target_state::uptodate;
+  }
+}
-- 
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