Add support for advanced package search

1 files changed, 69 insertions, 0 deletions

diff --git a/mod/utility.cxx b/mod/utility.cxx
new file mode 100644
index 0000000..5ca16a0
--- /dev/null
+++ b/mod/utility.cxx
@@ -0,0 +1,69 @@
+// file      : mod/utility.cxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#include <mod/utility.hxx>
+
+#include <libbutl/path-pattern.hxx>
+
+namespace brep
+{
+  string
+  wildcard_to_similar_to_pattern (const string& wildcard)
+  {
+    using namespace butl;
+
+    if (wildcard.empty ())
+      return "%";
+
+    string r;
+    for (const path_pattern_term& pt: path_pattern_iterator (wildcard))
+    {
+      switch (pt.type)
+      {
+      case path_pattern_term_type::question: r += '_'; break;
+      case path_pattern_term_type::star:     r += '%'; break;
+      case path_pattern_term_type::bracket:
+        {
+          // Copy the bracket expression translating the inverse character, if
+          // present.
+          //
+          size_t n (r.size ());
+          r.append (pt.begin, pt.end);
+
+          if (r[n + 1] == '!') // ...[!... ?
+            r[n + 1] = '^';
+
+          break;
+        }
+      case path_pattern_term_type::literal:
+        {
+          char c (get_literal (pt));
+
+          // Escape the special characters.
+          //
+          // Note that '.' is not a special character for SIMILAR TO.
+          //
+          switch (c)
+          {
+          case '\\':
+          case '%':
+          case '_':
+          case '|':
+          case '+':
+          case '{':
+          case '}':
+          case '(':
+          case ')':
+          case '[':
+          case ']': r += '\\'; break;
+          }
+
+          r += c;
+          break;
+        }
+      }
+    }
+
+    return r;
+  }
+}