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/*!
  \class SbString SbString.h Inventor/SbString.h
  \brief The SbString class is a string class with convenience functions for string operations.
  \ingroup base

  This is the class used for storing and working with character
  strings. It automatically takes care of supporting all the
  "bookkeeping" tasks usually associated with working with character
  strings, like memory allocation and deallocation etc.

  This class should also be well suited for use by the application
  programmer throughout the application using the Coin library.

  \sa SbName
*/

#include <Inventor/SbString.h>
#include <cctype>

#include <Inventor/lists/SbList.h>
#include "coindefs.h"

#ifndef COIN_WORKAROUND_NO_USING_STD_FUNCS
using std::tolower;
using std::toupper;
#endif // !COIN_WORKAROUND_NO_USING_STD_FUNCS

// FIXME: translate the find() and findAll() methods to C (will first
// need a growable array in C to handle the second argument to
// findAll()). 20020522 mortene.

// Helper function for find() and findAll().
static void
compute_prefix_function(SbList <int> & pi, const SbString & str)
{
  int len = str.getLength();
  pi.append(0);
  int k = 0;

  for (int q = 1; q < len; q++){
    while(k > 0 && (str.operator[](k) != str.operator[](q)))
      k = pi[k];
    if (str.operator[](k) == str.operator[](q))
      k++;
    pi.append(k);
  }
}

/*
   This is a reimplementation of sdbm hash algorithm from the sdbm project
*/
static unsigned int hash(const unsigned char * str, int n)
{
  unsigned long hash = 0;

  while (n--) {
    hash = (*str++) + (hash << 6) + (hash << 16) - hash;
  }

  return hash;
}

unsigned int SbHashFunc(const SbString & key) {
  const unsigned char * cKey = reinterpret_cast<const unsigned char *>(key.getString());
  return hash(cKey,key.getLength());
}


/*!
  If \a s is found, the method returns the first index where \a s
  starts. Otherwise it returns -1.

  Note: SbString::find() is a Coin specific extension to the original
  Open Inventor API.

  \sa SbString::findAll()
  \since Coin 2.0
*/
int
SbString::find(const SbString & strarg) const
{
  int lenthis = this->getLength();
  int lenstr = strarg.getLength();

  if (!lenthis) return -1;
  if (lenstr > lenthis) return -1;

  SbList<int> pi;
  compute_prefix_function(pi, strarg);
  int q = 0;

  for (int i = 0; i < lenthis; i ++){
    while (q > 0 && (strarg.operator[](q) != this->operator[](i)))
      q = pi.operator[](q - 1);
    if (strarg.operator[](q) == this->operator[](i))
      q++;
    if (q == lenstr){
      return (i - (lenstr - 1));
    }
  }
  return -1;
}

/*!
  All occurences of \a str is represented in \a found as indices to
  the characters where \a str starts. If 1 or more is found, \c TRUE
  is returned, else \c FALSE is returned.

  Note: SbString::findAll() is an extension to the original Open
  Inventor API.

  \sa SbString::find()
  \since Coin 2.0
*/

SbBool
SbString::findAll(const SbString & strarg, SbIntList & found) const
{
  // The KMP string matching algorithm is used for this method
  int lenthis = this->getLength();
  int lenstr = strarg.getLength();
  found.truncate(0);

  if (!lenthis) return FALSE;
  if (lenstr > lenthis) return FALSE;

  SbList<int> pi;
  compute_prefix_function(pi, strarg);
  int q = 0;

  for (int i = 0; i < lenthis; i ++){
    while (q > 0 && (strarg.operator[](q) != this->operator[](i)))
      q = pi.operator[](q - 1);
    if (strarg.operator[](q) == this->operator[](i))
      q++;
    if (q == lenstr){
      found.append(i - (lenstr - 1));
      q = pi.operator[](q - 1);
    }
  }
  if (!found.getLength()) return FALSE;
  return TRUE;
}

/*!
  Converts all of the characters to lowercase using tolower().

  \since Coin 3.1
*/
SbString
SbString::lower() const
{
  int lenthis = this->getLength();
  SbString newstr;

  for (int i = 0; i < lenthis; i++) {
    newstr += tolower((*this)[i]);
  }
  return newstr;
}

/*!
  Converts all of the characters to uppercase using toupper().

  \since Coin 3.1
*/
SbString
SbString::upper() const
{
  int lenthis = this->getLength();
  SbString newstr;

  for (int i = 0; i < lenthis; i++) {
    newstr += toupper((*this)[i]);
  }
  return newstr;
}

/*!
  Dump the state of this object to the \a file stream. Only works in
  debug version of library, method does nothing in an optimized
  compile.
*/
void
SbString::print(std::FILE * fp) const
{
#if COIN_DEBUG
  std::fputs(this->getString(),fp);
#endif // COIN_DEBUG
}


/*!
  \fn SbString::SbString(void)
  This is the default constructor.  It initializes the string to be empty.
*/

/*!
  \fn SbString::SbString(const SbString & str)
  This is the copy constructor.
*/

/*!
  \fn SbString::SbString(const char * str)
  This constructor assigns from the given string.
*/

/*!
  \fn SbString::SbString(const char * str, int start, int end)

  This constructor constructs a string from the given substring from
  \a start to \a end indices inclusive. If \a end is -1, the substring
  from \a start until the end of the string is used.
*/


/*!
  \fn SbString::SbString(const int digits)

  Construct an SbString instance containing the \a digits of the
  integer argument.
 */

/*!
  \fn void SbString::addIntString(const int value)

  Constructs a string from the given integer (e.g. intToString(42)
  creates the string "42"), and adds this to the contents of the
  string.
*/

/*!
  \fn int SbString::compareSubString(const char * text, int offset = 0) const

  Uses \a text as a substring to be compared to the string, starting at
  offset \a offset.  Return value is 0 upon success, and the failing
  character comparison difference upon failure.
*/

/*!
  \fn SbString SbString::getSubString(int startidx, int endidx) const

  This method returns a new string which contains a substring defined
  by the given indices \a startidx and \a endidx (inclusive).

  If \a endidx is -1, the substring from \a startidx to the end of the
  string is used.

  This will return a string which is (\a endidx - \a startidx + 1)
  characters long, i.e. if this string is "foo/bar" and we call by
  SbString::getSubString(0, 3), the returned string will be "foo/".
*/

/*!
  \fn void SbString::deleteSubString(int startidx, int endidx)

  This method deletes the substring defined by \a startidx and \a endidx
  (inclusive).  If \a endidx is -1, the substring from \a startidx to the
  end of the string is deleted.
*/

/*!
  \fn SbString::~SbString()

  The destructor. Deallocates any internal resources used during the
  lifetime of the SbString instance.
*/

/*!
  \fn uint32_t SbString::hash(void) const

  This method returns a reasonable hash value for the current string.

  \sa uint32_t SbString::hash(const char * s)
*/

/*!
  \fn uint32_t SbString::hash(const char * s)

  This static method returns a hash value for the given string.
*/

/*!
  \fn int SbString::getLength(void) const

  This method returns the length of the string.
*/

/*!
  \fn const char * SbString::getString(void) const

  This method returns the pointer to the string (character array).
*/

/*!
  \fn void SbString::makeEmpty(SbBool freeold)

  This method clears the string, making it an empty string ("").
  If \a freeold is \c TRUE (which is the default), the memory used by
  the old string is freed.  Otherwise, memory will be kept and reused
  when the string is manipulated later.
*/

/*!
  \fn char SbString::operator[](int index) const

  Returns character at position \a index in the string.

  \sa getSubString()
*/

/*!
  \fn SbString & SbString::operator=(const char * str)

  This is the assignment operator.
*/

/*!
  \fn SbString & SbString::operator=(const SbString & str)

  Assign from the given string.
*/

/*!
  \fn SbString & SbString::operator+=(const char * str)

  Concatenate the given string to the end of the current one.
*/

/*!
  \fn SbString & SbString::operator+=(const SbString & str)

  Concatenate the given string to the end of the current one.
*/

/*!
  \fn SbString & SbString::operator+=(const char c)

  Concatenate the given character to the end of the current string.

  \note This member function is not compatible with OpenInventor.
*/

/*!
  \fn int SbString::operator!(void) const

  This unary operator results in \c TRUE if the current string is empty ("")
  or \c FALSE otherwise.
*/

/*!
  \fn int operator==(const SbString & str, const char * s)

  Equality operator. Check if the strings have the same contents.

  \relates SbString
*/

/*!
  \fn int operator==(const char * s, const SbString & str)

  Equality operator. Check if the strings have the same contents.

  \relates SbString
*/

/*!
  \fn int operator==(const SbString & str1, const SbString & str2)

  Equality operator. Check if the strings have the same contents.

  \relates SbString
*/

/*!
  \fn int operator!=(const SbString & str, const char * s)

  Inequality operator.

  \relates SbString
*/

/*!
  \fn int operator!=(const char * s, const SbString & str)

  Inequality operator.

  \relates SbString
*/

/*!
  \fn int operator!=(const SbString & str1, const SbString & str2)

  Inequality operator.

  \relates SbString
*/

/*!
  \fn const SbString operator+(const SbString & str1, const SbString & str2)

  Addition operator.

  \relates SbString
*/

/*!
  \fn const SbString operator+(const SbString & sbstr, const char * s)

  Addition operator.

  \relates SbString
*/

/*!
  \fn const SbString operator+(const char * s, const SbString & sbstr)

  Addition operator.

  \relates SbString
*/

/*!
  \fn SbString & SbString::sprintf(const char * formatstr, ...)

  Set SbString instance to the formatted string \a formatstr,
  replacing the current contents.  The control characters within \a
  formatstr and the remaining arguments should follow the conventions
  of the printf() call.

  Note that this function is not part of the original Open Inventor
  API.
*/

/*!
  \fn SbString & SbString::vsprintf(const char * formatstr, va_list args)

  Set SbString instance to the formatted string \a formatstr,
  replacing the current contents.  The control characters within \a
  formatstr and the arguments of the \a args argument list should
  follow the conventions of the printf() call.

  Note that this function is not part of the original Open Inventor
  API.
*/

#ifdef COIN_TEST_SUITE
#include <Inventor/SbString.h>

static void * createInstance(void)
{
  return (void *)0x1234;
}

BOOST_AUTO_TEST_CASE(testAddition)
{
  SbString str1("First");
  SbString str2("Second");
  const char *cstr1 = "Erste";
  const char *cstr2 = "Zweite";

  SbString a = str1 + str2;
  SbString b = cstr1 + str2;
  SbString c = str1 + cstr2;

  BOOST_CHECK_MESSAGE(a == SbString("FirstSecond"),
                      "operator+ error");
  BOOST_CHECK_MESSAGE(b == SbString("ErsteSecond"),
                      "operator+ error");
  BOOST_CHECK_MESSAGE(c == SbString("FirstZweite"),
                      "operator+ error");
}

#endif // COIN_TEST_SUITE
