From 61377c582e0f2675baa5f5e6e30a35d1a4164b33 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Mon, 1 May 2017 16:08:43 +0300
Subject: Add hxx extension for headers and lib prefix for library dir

---
 libbutl/path-map.hxx | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 libbutl/path-map.hxx

(limited to 'libbutl/path-map.hxx')

diff --git a/libbutl/path-map.hxx b/libbutl/path-map.hxx
new file mode 100644
index 0000000..7a966ab
--- /dev/null
+++ b/libbutl/path-map.hxx
@@ -0,0 +1,120 @@
+// file      : libbutl/path-map.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUTL_PATH_MAP_HXX
+#define LIBBUTL_PATH_MAP_HXX
+
+#include <algorithm> // min()
+
+#include <libbutl/path.hxx>
+#include <libbutl/prefix-map.hxx>
+
+namespace butl
+{
+  // prefix_map for filesystem paths
+  //
+  // Important: the paths should be normalized but can use different case
+  // on case-insensitive platforms.
+  //
+  // Note that the path's representation of POSIX root ('/') is
+  // inconsistent in that we have a trailing delimiter at the end of
+  // the path (its "proper" representation would have been an empty
+  // string but that would have clashed with empty paths). To work
+  // around this snag, this implementation, during key comparison,
+  // detects '/' and treats it as empty. Note that the map will
+  // still store the key as you have first inserted it. So if you
+  // want a particular representation (i.e., empty or '/'), pre-
+  // populate the map with it.
+  //
+  template <typename C, typename K>
+  struct compare_prefix<basic_path<C, K>>
+  {
+    typedef basic_path<C, K> key_type;
+
+    typedef C delimiter_type;
+    typedef typename key_type::string_type string_type;
+    typedef typename key_type::size_type size_type;
+    typedef typename key_type::traits traits_type;
+
+    explicit
+    compare_prefix (delimiter_type) {}
+
+    bool
+    operator() (const key_type& x, const key_type& y) const
+    {
+      const string_type& xs (x.string ());
+      const string_type& ys (y.string ());
+
+      return compare (xs.c_str (),
+                      root (xs) ? 0 : xs.size (),
+                      ys.c_str (),
+                      root (ys) ? 0 : ys.size ()) < 0;
+    }
+
+    bool
+    prefix (const key_type& p, const key_type& k) const
+    {
+      const string_type& ps (p.string ());
+      const string_type& ks (k.string ());
+
+      return prefix (root (ps) ? string_type () : ps,
+                     root (ks) ? string_type () : ks);
+    }
+
+  protected:
+    bool
+    prefix (const string_type& p, const string_type& k) const
+    {
+      // The same code as in prefix_map but using our compare().
+      //
+      size_type pn (p.size ()), kn (k.size ());
+      return pn == 0 || // Empty key is always a prefix.
+        (pn <= kn &&
+         compare (p.c_str (), pn, k.c_str (), pn == kn ? pn : pn + 1) == 0);
+    }
+
+    int
+    compare (const C* x, size_type xn,
+             const C* y, size_type yn) const
+    {
+      size_type n (std::min (xn, yn));
+      int r (traits_type::compare (x, n, y, n));
+
+      if (r == 0)
+      {
+        // Pretend there is a delimiter characters at the end of the
+        // shorter string.
+        //
+        char xc (xn > n ? x[n] : (xn++, traits_type::directory_separator));
+        char yc (yn > n ? y[n] : (yn++, traits_type::directory_separator));
+        r = traits_type::compare (&xc, 1, &yc, 1);
+
+        // If we are still equal, then compare the lengths.
+        //
+        if (r == 0)
+          r = (xn == yn ? 0 : (xn < yn ? -1 : 1));
+      }
+
+      return r;
+    }
+
+    static bool
+    root (const string_type& p)
+    {
+      return p.size () == 1 && key_type::traits::is_separator (p[0]);
+    }
+  };
+
+  // Note that the delimiter character is not used (is_delimiter() from
+  // path_traits is used instead).
+  //
+  template <typename T>
+  using path_map = prefix_map<path, T, path::traits::directory_separator>;
+
+  template <typename T>
+  using dir_path_map =
+    prefix_map<dir_path, T, dir_path::traits::directory_separator>;
+}
+
+#endif // LIBBUTL_PATH_MAP_HXX
-- 
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