Pathname.cc

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/*---------------------------------------------------------------------\
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 \---------------------------------------------------------------------*/
#include <iostream>

#include "zypp/Pathname.h"

using std::string;

namespace zypp
{ 

  namespace filesystem
  { 

    namespace
    { 

      //
      //        CLASS NAME : DirStack
      //
      class DirStack {

        struct Dir {

          Dir *  up;
          Dir *  dn;
          string name;

          Dir( const string & n = "" ) {
            name = n;
            up = dn = 0;
          }

          ~Dir() {
            if ( up )
              up->dn = dn;
            if ( dn )
              dn->up = up;
          }
        };

        Dir *  top;
        Dir *  bot;

        void Pop() {
          if ( !top )
            return;
          top = top->dn;
          if ( top )
            delete top->up;
          else {
            delete bot;
            bot = 0;
          }
        }

      public:

        DirStack() { top = bot = 0; }
        ~DirStack() {
          while ( bot )
            Pop();
        }

        void Push( const string & n ) {
          if ( n.empty() || n == "." ) { // '.' or '/' only for bot
            if ( bot )
              return;
          } else if ( n == ".." && top ) {
            if ( top->name == "" )          // "/.."        ==> "/"
              return;

            if ( top->name != "." && top->name != ".." ) {      // "somedir/.." ==> ""
              Pop();
              return;
            }
            // "../.." "./.." stays
          }

          Dir * d = new Dir( n );
          if ( !top )
            top = bot = d;
          else {
            top->up = d;
            d->dn = top;
            d->up = 0;
            top = d;
          }
        }

        string str() {
          if ( !bot )
            return "";
          string ret;
          for ( Dir * d = bot; d; d = d->up ) {
            if ( d != bot )
              ret += "/";
            ret += d->name;
          }
          if ( ret.empty() )
            return "/";
          return ret;
        }
      };

    } // namespace

    //
    //  METHOD NAME : Pathname::_assign
    //  METHOD TYPE : void
    //
    void Pathname::_assign( const string & name_tv )
    {
      prfx_i = 0;
      name_t = name_tv;

      if ( name_t.empty() )
        return;

      string   Tprfx;
      DirStack Stack_Ci;

      char *       Buf_aci    = new char[name_tv.length() + 1];
      char *       W_pci      = Buf_aci;
      const char * R_pci      = name_tv.c_str();

      // check for prefix
      if (    name_t.length() >= 2
           && name_t[1] == ':'
           && (    'a' <= name_t[0] && name_t[0] <= 'z'
                || 'A' <= name_t[0] && name_t[0] <= 'Z' ) ) {
        Tprfx  = name_t.substr( 0, 2 );
        prfx_i = 2;
        R_pci += 2;
      }

      // rel or abs path
      if ( *R_pci == '/' || *R_pci == '\\' ) {
        Stack_Ci.Push( "" );
        ++R_pci;
      } else {
        Stack_Ci.Push( "." );
      }

      do {
        switch ( *R_pci ) {
        case '/':
        case '\\':
        case '\0':
          if ( W_pci != Buf_aci ) {
            *W_pci = '\0';
            W_pci = Buf_aci;
            Stack_Ci.Push( Buf_aci );
          }
          break;

        default:
          *W_pci++ = *R_pci;
          break;
        }
      } while( *R_pci++ );

      delete[] Buf_aci;
      name_t = Tprfx + Stack_Ci.str();
    }

    //
    //  METHOD NAME : Pathname::dirname
    //  METHOD TYPE : Pathname
    //
    Pathname Pathname::dirname( const Pathname & name_tv )
    {
      if ( name_tv.empty() )
        return "";

      Pathname ret_t( name_tv );
      string::size_type idx = ret_t.name_t.find_last_of( '/' );

      if ( idx == string::npos ) {
        ret_t.name_t.erase( ret_t.prfx_i );
        ret_t.name_t += ".";
      } else if ( idx == ret_t.prfx_i ) {
        ret_t.name_t.erase( ret_t.prfx_i );
        ret_t.name_t += "/";
      } else {
        ret_t.name_t.erase( idx );
      }

      return ret_t;
    }

    //
    //  METHOD NAME : Pathname::basename
    //  METHOD TYPE : string
    //
    string Pathname::basename( const Pathname & name_tv )
    {
      if ( name_tv.empty() )
        return string();

      string ret_t( name_tv.asString() );
      ret_t.erase( 0, name_tv.prfx_i );
      string::size_type idx = ret_t.find_last_of( '/' );
      if ( idx != string::npos ) {
        ret_t.erase( 0, idx+1 );
      }

      return ret_t;
    }

    //
    //  METHOD NAME : Pathname::extension
    //  METHOD TYPE : string
    //
    string Pathname::extension( const Pathname & name_tv )
    {
      if ( name_tv.empty() )
        return string();

      string base( basename( name_tv ) );
      string::size_type pos = base.rfind( '.' );
      if ( pos == string::npos )
        return string();
      return base.substr( pos );
    }

    //
    //  METHOD NAME : Pathname::cat
    //  METHOD TYPE : Pathname
    //
    Pathname Pathname::cat( const Pathname & name_tv, const Pathname & add_tv )
    {
      if ( add_tv.empty() )
        return name_tv;
      if ( name_tv.empty() )
        return add_tv;

      string ret_ti( add_tv.asString() );
      ret_ti.replace( 0, add_tv.prfx_i, "/" );

      return name_tv.asString() + ret_ti;
    }

    //
    //  METHOD NAME : Pathname::Extend
    //  METHOD TYPE : Pathname
    //
    Pathname Pathname::extend( const Pathname & l, const string & r )
    {
      return l.asString() + r;
    }

  } // namespace filesystem
} // namespace zypp

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