/* $Id: WString.h 1156 2011-06-07 04:01:16Z bhagman $
||
|| @author         Paul Stoffregen <paul@pjrc.com>
|| @url            http://wiring.org.co/
|| @contribution   Hernando Barragan <b@wiring.org.co>
|| @contribution   Brett Hagman <bhagman@wiring.org.co>
|| @contribution   Alexander Brevig <abrevig@wiring.org.co>
||
|| @description
|| | String class.
|| |
|| | Wiring Common API
|| #
||
|| @license Please see cores/Common/License.txt.
||
*/

#ifndef WSTRING_H
#define WSTRING_H

#ifdef __cplusplus

#include <string.h>
#include <ctype.h>
#include <avr/pgmspace.h>

#include "WVector.h"
//#include "Printable.h"

// When compiling programs with this class, the following gcc parameters
// dramatically increase performance and memory (RAM) efficiency, typically
// with little or no increase in code size.
//     -felide-constructors
//     -std=c++0x

// An inherited class for holding the result of a concatenation.  These
// result objects are assumed to be writable by subsequent concatenations.
class StringSumHelper;

// The string class
class String
{
    // use a function pointer to allow for "if (s)" without the
    // complications of an operator bool(). for more information, see:
    // http://www.artima.com/cppsource/safebool.html
    typedef void (String::*StringIfHelperType)() const;
    void StringIfHelper() const {}

  public:
    // constructors
    // creates a copy of the initial value.
    // if the initial value is null or invalid, or if memory allocation
    // fails, the string will be marked as invalid (i.e. "if (s)" will
    // be false).
    String(const char *cstr = "");
    String(const String &str);
#ifdef __GXX_EXPERIMENTAL_CXX0X__
    String(String && rval);
    String(StringSumHelper && rval);
#endif
    explicit String(char c);
    explicit String(unsigned char, unsigned char base = 10);
    explicit String(int, unsigned char base = 10);
    explicit String(unsigned int, unsigned char base = 10);
    explicit String(long, unsigned char base = 10);
    explicit String(unsigned long, unsigned char base = 10);
    explicit String(float, unsigned char decimalPlaces=2);
    explicit String(double, unsigned char decimalPlaces=2);
    ~String(void);

    // memory management
    // return true on success, false on failure (in which case, the string
    // is left unchanged).  reserve(0), if successful, will validate an
    // invalid string (i.e., "if (s)" will be true afterwards)
    unsigned char reserve(unsigned int size);
    inline unsigned int length(void) const
    {
      return len;
    }

    // creates a copy of the assigned value.  if the value is null or
    // invalid, or if the memory allocation fails, the string will be
    // marked as invalid ("if (s)" will be false).
    String & operator = (const String &rhs);
    String & operator = (const char *cstr);
#ifdef __GXX_EXPERIMENTAL_CXX0X__
    String & operator = (String && rval);
    String & operator = (StringSumHelper && rval);
#endif

    // concatenate (works w/ built-in types)

    // returns true on success, false on failure (in which case, the string
    // is left unchanged).  if the argument is null or invalid, the
    // concatenation is considered unsucessful.
    unsigned char concat(const String &str);
    unsigned char concat(const char *cstr);
    unsigned char concat(char c);
    unsigned char concat(unsigned char c);
    unsigned char concat(int num);
    unsigned char concat(unsigned int num);
    unsigned char concat(long num);
    unsigned char concat(unsigned long num);
    unsigned char concat(float num);
    unsigned char concat(double num);
  
    // if there's not enough memory for the concatenated value, the string
    // will be left unchanged (but this isn't signalled in any way)
    String & operator += (const String &rhs)
    {
      concat(rhs);
      return (*this);
    }
    String & operator += (const char *cstr)
    {
      concat(cstr);
      return (*this);
    }
    String & operator += (char c)
    {
      concat(c);
      return (*this);
    }
    String & operator += (unsigned char num)
    {
      concat(num);
      return (*this);
    }
    String & operator += (int num)
    {
      concat(num);
      return (*this);
    }
    String & operator += (unsigned int num)
    {
      concat(num);
      return (*this);
    }
    String & operator += (long num)
    {
      concat(num);
      return (*this);
    }
    String & operator += (unsigned long num)
    {
      concat(num);
      return (*this);
    }
    String & operator += (float num)
    {
      concat(num);
      return (*this);
    }
    String & operator += (double num)
    {
      concat(num);
      return (*this);
    }

    friend StringSumHelper & operator + (const StringSumHelper &lhs, const String &rhs);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, const char *cstr);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, char c);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, unsigned char num);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, int num);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, unsigned int num);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, long num);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, unsigned long num);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, float num);
    friend StringSumHelper & operator + (const StringSumHelper &lhs, double num);

    // comparison (only works w/ Strings and "strings")
    operator StringIfHelperType() const
    {
      return buffer ? &String::StringIfHelper : 0;
    }
    int compareTo(const String &s) const;
    unsigned char equals(const String &s) const;
    unsigned char equals(const char *cstr) const;
    unsigned char operator == (const String &rhs) const
    {
      return equals(rhs);
    }
    unsigned char operator == (const char *cstr) const
    {
      return equals(cstr);
    }
    unsigned char operator != (const String &rhs) const
    {
      return !equals(rhs);
    }
    unsigned char operator != (const char *cstr) const
    {
      return !equals(cstr);
    }
    unsigned char operator < (const String &rhs) const;
    unsigned char operator > (const String &rhs) const;
    unsigned char operator <= (const String &rhs) const;
    unsigned char operator >= (const String &rhs) const;
    unsigned char equalsIgnoreCase(const String &s) const;
    unsigned char startsWith(const String &prefix) const;
    unsigned char startsWith(const String &prefix, unsigned int offset) const;
    unsigned char endsWith(const String &suffix) const;

    // character acccess
    char charAt(unsigned int index) const;
    void setCharAt(unsigned int index, char c);
    char operator [](unsigned int index) const;
    char& operator [](unsigned int index);
    void getBytes(unsigned char *buf, unsigned int bufsize, unsigned int index = 0) const;
    void toCharArray(char *buf, unsigned int bufsize, unsigned int index = 0) const
    {
      getBytes((unsigned char *)buf, bufsize, index);
    }
    const char * c_str() const { return buffer; }
  
    // search
    int indexOf(char ch) const;
    int indexOf(char ch, unsigned int fromIndex) const;
    int indexOf(const String &str) const;
    int indexOf(const String &str, unsigned int fromIndex) const;
    int lastIndexOf(char ch) const;
    int lastIndexOf(char ch, int fromIndex) const;
    int lastIndexOf(const String &str) const;
    int lastIndexOf(const String &str, int fromIndex) const;
    String substring(unsigned int beginIndex) const { return substring(beginIndex, len); };
    String substring(unsigned int beginIndex, unsigned int endIndex) const;

    // modification
    void replace(char find, char replace);
    void replace(const String& find, const String& replace);
    void remove(unsigned int index);
    void remove(unsigned int index, unsigned int count);
    void toLowerCase(void);
    void toUpperCase(void);
    void trim(void);

    // parsing/conversion
    long toInt(void) const;
    float toFloat(void) const;
  
    friend int splitString(String &what, int delim, Vector<long> &splits);
    friend int splitString(String &what, int delim, Vector<int> &splits);

    //void printTo(Print &p) const;


  protected:
    char *buffer;	        // the actual char array
    unsigned int capacity;  // the array length minus one (for the '\0')
    unsigned int len;       // the String length (not counting the '\0')
    unsigned char flags;    // unused, for future features
  protected:
    void init(void);
    void invalidate(void);
    unsigned char changeBuffer(unsigned int maxStrLen);
    unsigned char concat(const char *cstr, unsigned int length);

    // copy and move
    String & copy(const char *cstr, unsigned int length);
#ifdef __GXX_EXPERIMENTAL_CXX0X__
    void move(String &rhs);
#endif
};

class StringSumHelper : public String
{
  public:
    StringSumHelper(const String &s) : String(s) {}
    StringSumHelper(const char *p) : String(p) {}
    StringSumHelper(char c) : String(c) {}
    StringSumHelper(unsigned char num) : String(num) {}
    StringSumHelper(int num) : String(num) {}
    StringSumHelper(unsigned int num) : String(num) {}
    StringSumHelper(long num) : String(num) {}
    StringSumHelper(unsigned long num) : String(num) {}
    StringSumHelper(float num) : String(num) {}
    StringSumHelper(double num) : String(num) {}
};

#endif  // __cplusplus
#endif
// WSTRING_H
