[metadata] Add GetWikiTitle and GetWikiURL methods

1 files changed, 75 insertions, 0 deletions

diff --git a/indexer/feature_meta.cpp b/indexer/feature_meta.cpp
index 5b86dee054..02d21f8287 100644
--- a/indexer/feature_meta.cpp
+++ b/indexer/feature_meta.cpp
@@ -1 +1,76 @@
 #include "indexer/feature_meta.hpp"
+
+namespace feature
+{
+string Metadata::GetWikiURL() const
+{
+  string value = this->Get(FMD_WIKIPEDIA);
+  string::size_type i = value.find(':');
+  if (i == string::npos)
+    return string();
+  return "https://" + value.substr(0, i) + ".wikipedia.org/wiki/" + value.substr(i + 1);
+}
+
+char hex_to_dec(char ch)
+{
+  if (ch >= '0' && ch <= '9')
+    return ch - '0';
+  if (ch >= 'a')
+    ch -= 32;
+  if (ch >= 'A' && ch <= 'F')
+    return ch - 'A' + 10;
+  return -1;
+}
+
+string UriDecode(string const & sSrc)
+{
+  // This code was slightly modified from
+  // http://www.codeguru.com/cpp/cpp/string/conversions/article.php/c12759
+  //
+  // Note from RFC1630: "Sequences which start with a percent
+  // sign but are not followed by two hexadecimal characters
+  // (0-9, A-F) are reserved for future extension"
+
+  const unsigned char * pSrc = (const unsigned char *)sSrc.c_str();
+  const string::size_type SRC_LEN = sSrc.length();
+  const unsigned char * const SRC_END = pSrc + SRC_LEN;
+  // last decodable '%'
+  const unsigned char * const SRC_LAST_DEC = SRC_END - 2;
+
+  char * const pStart = new char[SRC_LEN];
+  char * pEnd = pStart;
+
+  while (pSrc < SRC_LAST_DEC)
+  {
+    if (*pSrc == '%')
+    {
+      char dec1 = hex_to_dec(*(pSrc + 1));
+      char dec2 = hex_to_dec(*(pSrc + 2));
+      if (-1 != dec1 && -1 != dec2)
+      {
+        *pEnd++ = (dec1 << 4) + dec2;
+        pSrc += 2;
+      }
+    }
+    else if (*pSrc == '_')
+      *pEnd++ = ' ';
+    else
+      *pEnd++ = *pSrc;
+    pSrc++;
+  }
+
+  // the last 2- chars
+  while (pSrc < SRC_END)
+    *pEnd++ = *pSrc++;
+
+  string sResult(pStart, pEnd);
+  delete [] pStart;
+  return sResult;
+}
+
+string Metadata::GetWikiTitle() const
+{
+  string value = this->Get(FMD_WIKIPEDIA);
+  return UriDecode(value);
+}
+}  // namespace feature