From fd2c0dc9707714d82580dc61854efc06335e6091 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 6 Oct 2015 08:43:01 +0200
Subject: Track prerequisite packages, handle in pkg-{con,dis}figure

---
 bpkg/satisfaction.cxx | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 bpkg/satisfaction.cxx

(limited to 'bpkg/satisfaction.cxx')

diff --git a/bpkg/satisfaction.cxx b/bpkg/satisfaction.cxx
new file mode 100644
index 0000000..0631b83
--- /dev/null
+++ b/bpkg/satisfaction.cxx
@@ -0,0 +1,101 @@
+// file      : bpkg/satisfaction.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <bpkg/satisfaction>
+
+#include <bpkg/package-odb>
+#include <bpkg/diagnostics>
+
+using namespace std;
+using namespace butl;
+
+namespace bpkg
+{
+  bool
+  satisfies (const version& v, const dependency_constraint& c)
+  {
+    using op = comparison;
+
+    // Note that the constraint's version is always rhs (libfoo >= 1.2.3).
+    //
+    switch (c.operation)
+    {
+    case op::eq: return v == c.version;
+    case op::lt: return v <  c.version;
+    case op::gt: return v >  c.version;
+    case op::le: return v <= c.version;
+    case op::ge: return v >= c.version;
+    }
+
+    assert (false);
+    return false;
+  }
+
+  bool
+  satisfies (const dependency_constraint& l, const dependency_constraint& r)
+  {
+    using op = comparison;
+
+    op lo (l.operation);
+    op ro (r.operation);
+
+    const version& lv (l.version);
+    const version& rv (r.version);
+
+    switch (lo)
+    {
+    case op::eq: // ==
+      {
+        return ro == op::eq && lv == rv;
+      }
+    case op::lt: // <
+      {
+        switch (ro)
+        {
+        case op::eq: return rv <  lv;
+        case op::lt: return rv <= lv;
+        case op::le: return rv <  lv;
+        case op::gt:
+        case op::ge: return false;
+        }
+      }
+    case op::le: // <=
+      {
+        switch (ro)
+        {
+        case op::eq: return rv <= lv;
+        case op::lt: return rv <  lv;
+        case op::le: return rv <= lv;
+        case op::gt:
+        case op::ge: return false;
+        }
+      }
+    case op::gt: // >
+      {
+        switch (ro)
+        {
+        case op::eq: return lv >  rv;
+        case op::lt:
+        case op::le: return false;
+        case op::gt: return lv >= rv;
+        case op::ge: return lv >  rv;
+        }
+      }
+    case op::ge: // >=
+      {
+        switch (ro)
+        {
+        case op::eq: return lv >= rv;
+        case op::lt:
+        case op::le: return false;
+        case op::gt: return lv >  rv;
+        case op::ge: return lv >= rv;
+        }
+      }
+    }
+
+    assert (false);
+    return false;
+  }
+}
-- 
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