#include "Modifiers.h"
#include "Exception.h"

namespace jet {
   
   void Modifiers::processToBinaryModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
      value.reset();
      lastConverted = "";
      char temp;
      while(!value.eod()) {
	 temp = value.nextChar();
	 if(strchr("\\'\".\0\r\n", temp))
	   lastConverted.write('\\');
	 lastConverted.write(temp);	  
      }
      value.reset();
   }
   	
   void Modifiers::processFromBinaryModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
      value.reset();
      lastConverted = "";
      while(!value.eod()) {
	 if(value.ifNext("\\r"))
	   lastConverted.write(13);
	 else if(value.ifNext("\\n"))
	   lastConverted.write(10);
	 else if(value.ifNext("\\0")) 
	   lastConverted.write(0);
	 else if(value.ifNext("\\\\"))
	   lastConverted.write("\\");
	 else if(value.ifNext("\\."))
	   lastConverted.write(".");
	 else if(value.ifNext("\\\""))
	   lastConverted.write("\"");
	 else if(value.ifNext("\\\'"))
	   lastConverted.write("'");
	 else
	   lastConverted.write(value.nextChar());
      }        
      value.reset();
   }
      
   void Modifiers::processToHexModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
      value.reset();
      lastConverted = "";
      char temp;
      while(!value.eod()) {
	 temp = value.nextChar();
	 char temp2 = temp;
	 temp >>= 4;
	 lastConverted.write(hexChar(temp));
	 lastConverted.write(hexChar(temp2));
      }      
      value.reset();
   }   	

   void Modifiers::processFromHexModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
      value.reset();
      lastConverted = "";
      while(!value.eod()) {
	 char ch1 = value.nextChar();
	 ch1 -= 48;
	 if(ch1 > 9)
	   ch1 -= 7;
	 ch1 <<= 4;
	 ch1 &= 240;
	 if(value.eod())
	   coreutils::Exception("conversion from hex requires even number of characters.");
	 char ch2 = value.nextChar();
	 ch2 -= 48;
	 if(ch2 > 9)
	   ch2 -= 7;
	 ch2 &= 15;
	 ch1 |= ch2;
	 lastConverted.write(ch1);	 
      }
      value.reset();
   }
   	
   void Modifiers::processToBase64Modifier(coreutils::MString &value, coreutils::MString &lastConverted) {
   }
   	
   void Modifiers::processFromBase64Modifier(coreutils::MString &value, coreutils::MString &lastConverted) {
   }
   	
   void Modifiers::processToUpperModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
   }
   	
   void Modifiers::processToLowerModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
   }
   	
   void Modifiers::processToCGIModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
   }
   	
   void Modifiers::processFromCGIModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
   }

   char Modifiers::hexChar(char c) {
      c &= 15;
      c += 48;
      if(c > 57)
	c += 7;
      return c;
   }
   
}