Make regex class template

1 files changed, 69 insertions, 0 deletions

diff --git a/cutl/re/re.txx b/cutl/re/re.txx
new file mode 100644
index 0000000..9c4122b
--- /dev/null
+++ b/cutl/re/re.txx
@@ -0,0 +1,69 @@
+// file      : cutl/re/re.txx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+namespace cutl
+{
+  namespace re
+  {
+    //
+    // basic_regexsub
+    //
+    template <typename C>
+    void basic_regexsub<C>::
+    init (string_type const& s)
+    {
+      string_type r;
+      typename string_type::size_type p (parse (s, 0, r));
+      regex_ = r;
+      p = parse (s, p, sub_);
+      if (p + 1 < s.size ())
+        throw basic_format<C> (s, "junk after third delimiter");
+    }
+
+    //
+    // parse()
+    //
+    template <typename C>
+    typename std::basic_string<C>::size_type
+    parse (std::basic_string<C> const& s,
+           typename std::basic_string<C>::size_type p,
+           std::basic_string<C>& r)
+    {
+      r.clear ();
+      typename std::basic_string<C>::size_type n (s.size ());
+
+      if (p >= n)
+        throw basic_format<C> (s, "empty expression");
+
+      char d (s[p++]);
+
+      for (; p < n; ++p)
+      {
+        if (s[p] == d)
+          break;
+
+        if (s[p] == '\\')
+        {
+          if (++p < n)
+          {
+            // Pass the escape sequence through unless it is the delimiter.
+            //
+            if (s[p] != d)
+              r += '\\';
+
+            r += s[p];
+          }
+          // else {We ran out of stuff before finding the delimiter.}
+        }
+        else
+          r += s[p];
+      }
+
+      if (p == n)
+        throw basic_format<C> (s, "missing closing delimiter");
+
+      return p;
+    }
+  }
+}