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Character.cpp

// ---------------------------------------------------------------------------
// - Character.cpp                                                           -
// - standard object library - unicode character class implementation        -
// ---------------------------------------------------------------------------
// - This program is free software;  you can redistribute it  and/or  modify -
// - it provided that this copyright notice is kept intact.                  -
// -                                                                         -
// - This program  is  distributed in  the hope  that it will be useful, but -
// - without  any  warranty;  without  even   the   implied    warranty   of -
// - merchantability or fitness for a particular purpose.  In no event shall -
// - the copyright holder be liable for any  direct, indirect, incidental or -
// - special damages arising in any way out of the use of this software.     -
// ---------------------------------------------------------------------------
// - copyright (c) 1999-2007 amaury darsch                                   -
// ---------------------------------------------------------------------------

#include "Input.hpp"
#include "Stdsid.hxx"
#include "Vector.hpp"
#include "Output.hpp"
#include "Unicode.hpp"
#include "Character.hpp"
#include "Recycle.hpp"
#include "Integer.hpp"
#include "Boolean.hpp"
#include "Runnable.hpp"
#include "QuarkZone.hpp"
#include "Exception.hpp"
#include "ccnv.hpp"

namespace afnix {

  // -------------------------------------------------------------------------
  // - memory section                                                        -
  // -------------------------------------------------------------------------

  // the character recycler
  static Recycle recycler;

  // allocate a new character
  void* Character::operator new (const t_size size) {
    return recycler.pop (size);
  }

  // delete a character
  void Character::operator delete (void* handle) {
    recycler.push (handle);
  }

  // -------------------------------------------------------------------------
  // - class section                                                         -
  // -------------------------------------------------------------------------

  // create a new default character

00056   Character::Character (void) {
    d_value = nilc;
  }

  // create a new character from a native character

00062   Character::Character (const char value) {
    d_value = value;
  }

  // create a new character from a native character

00068   Character::Character (const t_quad value) {
    d_value = value;
  }
  
  // create a new character from a string representation

00074   Character::Character (const String& value) {
    d_value = Unicode::toquad (value);
  }

  // copy constructor for this character class

00080   Character::Character (const Character& that) {
    that.rdlock ();
    d_value = that.d_value;
    that.unlock ();
  }

  // return the class name

00088   String Character::repr (void) const {
    return "Character";
  }

  // return a literal representation of this character

00094   String Character::toliteral (void) const {
    rdlock ();
    String result = Unicode::toliteral (d_value);
    unlock ();
    return result;
  }

  // return a string representation of this character

00103   String Character::tostring (void) const {
    rdlock ();
    String result = d_value;
    unlock ();
    return result;    
  }

  // return a clone of this character

00112   Object* Character::clone (void) const {
    return new Character (*this);
  }

  // return the character serial code

00118   t_byte Character::serialid (void) const {
    return SERIAL_CHAR_ID;
  }

  // serialize this character

00124   void Character::wrstream (Output& os) const {
    rdlock ();
    os.write (d_value);
    unlock ();
  }

  // deserialize this character

00132   void Character::rdstream (Input& is) {
    wrlock ();
    d_value = is.rduc ();
    unlock ();
  }

  // return a native character

00140   char Character::tochar (void) const {
    rdlock ();
    char result = Unicode::tochar (d_value);
    unlock ();
    return result;
  }

  // return a native quad

00149   t_quad Character::toquad (void) const {
    rdlock ();
    t_quad result = d_value;
    unlock ();
    return result;
  }

  // set an character with a native value

00158   Character& Character::operator = (const char value) {
    wrlock ();
    d_value = value;
    unlock ();
    return *this;
  }

  // set an character with a native value

00167   Character& Character::operator = (const t_quad value) {
    wrlock ();
    d_value = value;
    unlock ();
    return *this;
  }

  // set an character with a character

00176   Character& Character::operator = (const Character& value) {
    wrlock ();
    value.rdlock ();
    d_value = value.d_value;
    value.unlock ();
    unlock ();
    return *this;
  }
  
  // add a character with a native value

00187   Character Character::operator + (const long value) {
    wrlock ();
    t_quad result = d_value + value;
    unlock ();
    return Character (result);
  }

  // sub a character with a native value

00196   Character Character::operator - (const long value) {
    wrlock ();
    t_quad result = d_value - value;
    unlock ();
    return Character (result);
  }

  // add a native value to this character

00205   Character& Character::operator += (const long value) {
    wrlock ();
    d_value = d_value + value;
    unlock ();
    return *this;
  }

  // sub a native value to this character

00214   Character& Character::operator -= (const long value) {
    wrlock ();
    d_value = d_value - value;
    unlock ();
    return *this;
  }

  // prefix add one to the character

00223   Character& Character::operator ++ (void) {
    wrlock ();
    ++d_value;
    unlock ();
    return *this;
  }

  // postfix add one to the character

00232   Character Character::operator ++ (int) {
    wrlock ();
    Character result = *this;
    d_value++;
    unlock ();
    return result;
  }

  // prefix sub one to the character

00242   Character& Character::operator -- (void) {
    wrlock ();
    --d_value;
    unlock ();
    return *this;
  }

  // postfix sub one to the character

00251   Character Character::operator -- (int) {
    wrlock ();
    Character result = *this;
    d_value--;
    unlock ();
    return result;
  }

  // compare an character with a native value
  
00261   bool Character::operator == (const char value) const {
    rdlock ();
    bool result = (d_value == Unicode::toquad (value));
    unlock ();
    return result;
  }
  
00268   bool Character::operator != (const char value) const {
    rdlock ();
    bool result = (d_value != Unicode::toquad (value));
    unlock ();
    return result;
  }

  // compare an character with a native value
  
00277   bool Character::operator == (const t_quad value) const {
    rdlock ();
    bool result = (d_value == value);
    unlock ();
    return result;
  }
  
00284   bool Character::operator != (const t_quad value) const {
    rdlock ();
    bool result = (d_value != value);
    unlock ();
    return result;
  }
  
  // compare two character characters
  
00293   bool Character::operator == (const Character& value) const {
    rdlock ();
    value.rdlock ();
    bool result = (d_value == value.d_value);
    value.unlock ();
    unlock ();
    return result;
  }
  
00302   bool Character::operator != (const Character& value) const {
    rdlock ();
    value.rdlock ();
    bool result = (d_value != value.d_value);
    value.unlock ();
    unlock ();
    return result;
  }
  
00311   bool Character::operator < (const Character& value) const {
    rdlock ();
    value.rdlock ();
    bool result = (d_value < value.d_value);
    value.unlock ();
    unlock ();
    return result;
  }
  
00320   bool Character::operator <= (const Character& value) const {
    rdlock ();
    value.rdlock ();
    bool result = (d_value <= value.d_value);
    value.unlock ();
    unlock ();
    return result;
  }
  
00329   bool Character::operator > (const Character& value) const {
    rdlock ();
    value.rdlock ();
    bool result = (d_value > value.d_value);
    value.unlock ();
    unlock ();
    return result;
  }
  
00338   bool Character::operator >= (const Character& value) const {
    rdlock ();
    value.rdlock ();
    bool result = (d_value >= value.d_value);
    value.unlock ();
    unlock ();
    return result;
  }
  
  // return true if the character is a letter

00349   bool Character::isletter (void) const {
    rdlock ();
    bool result = Unicode::isletter (d_value);
    unlock ();
    return result;
  }

  // return true if the character is a digit

00358   bool Character::isdigit (void) const {
    rdlock ();
    bool result = Unicode::isdigit (d_value);
    unlock ();
    return result;
  }

  // return true if the character is alphanumeric

00367   bool Character::isalpha (void) const {
    rdlock ();
    bool result = Unicode::isalpha (d_value);
    unlock ();
    return result;
  }

  // return true if the character is a blank or tab
  
00376   bool Character::isblank (void) const {
    rdlock ();
    bool result = Unicode::isblank (d_value);
    unlock ();
    return result;
  }

  // return true if the character is an ascii character
  
00385   bool Character::isascii (void) const {
    rdlock ();
    bool result = Unicode::isascii (d_value);
    unlock ();
    return result;
  }

  // return true if the character is a latin character
  
00394   bool Character::islatin (void) const {
    rdlock ();
    bool result = Unicode::islatin (d_value);
    unlock ();
    return result;
  }

  // return true if the character is an eol

00403   bool Character::iseol (void) const {
    rdlock ();
    bool result = (d_value == eolq);
    unlock ();
    return result;
  }
  
  // return true if the character is an eof

00412   bool Character::iseof (void) const {
    rdlock ();
    bool result = (d_value == eofq);
    unlock ();
    return result;
  }

  // return true if the character is nil

00421   bool Character::isnil (void) const {
    rdlock ();
    bool result = (d_value == nilq);
    unlock ();
    return result;
  }

  // -------------------------------------------------------------------------
  // - object section                                                        -
  // -------------------------------------------------------------------------

  // the quark zone
  static const long QUARK_ZONE_LENGTH = 20;
  static QuarkZone  zone (QUARK_ZONE_LENGTH);

  // the object supported quarks
  static const long QUARK_OPP     = zone.intern ("++");
  static const long QUARK_OMM     = zone.intern ("--");
  static const long QUARK_ADD     = zone.intern ("+");
  static const long QUARK_SUB     = zone.intern ("-");
  static const long QUARK_EQL     = zone.intern ("==");
  static const long QUARK_NEQ     = zone.intern ("!=");
  static const long QUARK_LTH     = zone.intern ("<");
  static const long QUARK_LEQ     = zone.intern ("<=");
  static const long QUARK_GTH     = zone.intern (">");
  static const long QUARK_GEQ     = zone.intern (">=");
  static const long QUARK_AEQ     = zone.intern ("+=");
  static const long QUARK_SEQ     = zone.intern ("-=");
  static const long QUARK_EOLP    = zone.intern ("eol-p");
  static const long QUARK_EOFP    = zone.intern ("eof-p");
  static const long QUARK_NILP    = zone.intern ("nil-p");
  static const long QUARK_TOINT   = zone.intern ("to-integer");
  static const long QUARK_LETERP  = zone.intern ("letter-p");
  static const long QUARK_DIGITP  = zone.intern ("digit-p");
  static const long QUARK_ALPHAP  = zone.intern ("alpha-p");
  static const long QUARK_BLANKP  = zone.intern ("blank-p");

  // evaluate an object to a native value

00460   t_quad Character::evalto (Runnable* robj, Nameset* nset, Object* object) {
    Object*    obj = (object == nilp) ? nilp : object->eval (robj, nset);
    Character* val = dynamic_cast <Character*> (obj);
    if (val == nilp) throw Exception ("type-error", "nil object to evaluate");
    return val->toquad ();
  }

  // create a new object in a generic way

00469   Object* Character::mknew (Vector* argv) {
    if ((argv == nilp) || (argv->length () == 0)) return new Character;
    if (argv->length () != 1) 
      throw Exception ("argument-error", 
                   "too many argument with character constructor");
    // try to map the character argument
    Object* obj = argv->get (0);
    if (obj == nilp) return new Character;

    // try an integer object
    Integer* ival = dynamic_cast <Integer*> (obj);
    if (ival != nilp) return new Character ((t_quad) ival->tointeger ());

    // try a unicode character object
    Character* cval = dynamic_cast <Character*> (obj);
    if (cval != nilp) return new Character (*cval);

    // try a string object
    String* sval = dynamic_cast <String*> (obj);
    if (sval != nilp) return new Character (*sval);

    // illegal object
    throw Exception ("type-error", "illegal object with character constructor",
                 obj->repr ());
  }

  // return true if the given quark is defined

00497   bool Character::isquark (const long quark, const bool hflg) const {
    rdlock ();
    if (zone.exists (quark) == true) {
      unlock ();
      return true;
    }
    bool result = hflg ? Literal::isquark (quark, hflg) : false;
    unlock ();
    return result;
  }

  // operate this object with another object

00510   Object* Character::oper (t_oper type, Object* object) {
    Integer*   iobj = dynamic_cast <Integer*>   (object);
    Character* cobj = dynamic_cast <Character*> (object);
    switch (type) {
    case Object::ADD:
      if (iobj != nilp) return new Character (*this + iobj->tointeger ());
      break;
    case Object::SUB:
      if (iobj != nilp) return new Character (*this - iobj->tointeger ());
      break;
    case Object::EQL:
      if (cobj != nilp) return new Boolean (*this == *cobj);
      break;
    case Object::NEQ:
      if (cobj != nilp) return new Boolean (*this != *cobj);
      break;
    case Object::GEQ:
      if (cobj != nilp) return new Boolean (*this >= *cobj);
      break;
    case Object::GTH:
      if (cobj != nilp) return new Boolean (*this > *cobj);
      break;
    case Object::LEQ:
      if (cobj != nilp) return new Boolean (*this <= *cobj);
      break;
    case Object::LTH:
      if (cobj != nilp) return new Boolean (*this < *cobj);
      break;
    default:
      throw Exception ("operator-error", "unsupported unicode operator");
    }
    throw Exception ("type-error", "invalid operand with unicode character",
                 Object::repr (object));
  }

  // set an object to this character

00547   Object* Character::vdef (Runnable* robj, Nameset* nset, Object* object) {
    Character* cobj = dynamic_cast <Character*> (object);
    if (cobj != nilp) {
      *this = *cobj;
      robj->post (this);
      return this;
    }
    throw Exception ("type-error", "invalid object with character vdef",
                 Object::repr (object));
  }

  // apply this object with a set of arguments and a quark

00560   Object* Character::apply (Runnable* robj, Nameset* nset, const long quark,
                      Vector* argv) {
    // get the number of arguments
    long argc = (argv == nilp) ? 0 : argv->length ();

    // dispatch 0 argument
    if (argc == 0) {
      if (quark == QUARK_TOINT)  return new Integer (toquad ());
      
      if (quark == QUARK_OPP) {
      ++(*this);
      robj->post (this);
      return this;
      }
      if (quark == QUARK_OMM) {
      --(*this);
      robj->post (this);
      return this;
      }
      if (quark == QUARK_LETERP) return new Boolean (isletter ());
      if (quark == QUARK_DIGITP) return new Boolean (isdigit  ());
      if (quark == QUARK_ALPHAP) return new Boolean (isalpha  ());
      if (quark == QUARK_BLANKP) return new Boolean (isblank  ());
      if (quark == QUARK_EOLP)   return new Boolean (iseol ());
      if (quark == QUARK_EOFP)   return new Boolean (iseof ());
      if (quark == QUARK_NILP)   return new Boolean (isnil ());
    }
    // dispatch 1 argument
    if (argc == 1) {
      if (quark == QUARK_ADD) return oper (Object::ADD, argv->get (0));
      if (quark == QUARK_SUB) return oper (Object::SUB, argv->get (0));
      if (quark == QUARK_EQL) return oper (Object::EQL, argv->get (0));
      if (quark == QUARK_NEQ) return oper (Object::NEQ, argv->get (0));
      if (quark == QUARK_LTH) return oper (Object::LTH, argv->get (0));
      if (quark == QUARK_LEQ) return oper (Object::LEQ, argv->get (0));
      if (quark == QUARK_GTH) return oper (Object::GTH, argv->get (0));
      if (quark == QUARK_GEQ) return oper (Object::GEQ, argv->get (0));

      if (quark == QUARK_AEQ) {
      long val = argv->getint (0);
      *this += val;
      robj->post (this);
      return this;
      }
      if (quark == QUARK_SEQ) {
      long val = argv->getint (0);
      *this -= val;
      robj->post (this);
      return this;
      }
    }
    // call the literal method
    return Literal::apply (robj, nset, quark, argv);
  }
}

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