/*  Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi.psy.uva.nl/projects/xpce/
    Copyright (c)  1999-2013, University of Amsterdam
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in
       the documentation and/or other materials provided with the
       distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/

#include <h/kernel.h>
#include <h/graphics.h>
#include <h/lang.h>
#include <h/unix.h>
#include <h/text.h>

static status	 contextClassVariable(ClassVariable cv, Class context);
static StringObj getDefault(Class class, Name name, int accept_default);
static status	 appendClassVariableClass(Class class, ClassVariable cv);

static Constant NotObtained;

static status
initialiseClassVariable(ClassVariable cv,
			Class context, Name name, Any def,
			Type type, StringObj summary)
{ initialiseProgramObject(cv);

  assign(cv, name,       name);
  assign(cv, type,       type);
  assign(cv, cv_default, def);
  assign(cv, value,      NotObtained);
  assign(cv, summary,    summary);

  contextClassVariable(cv, context);

  return appendClassVariableClass(context, cv);
}


static status
contextClassVariable(ClassVariable cv, Class context)
{ if ( cv->context != context )
  { Variable var = getInstanceVariableClass(context, cv->name);

    assign(cv, context, context);
    assign(cv, value, NotObtained);

    if ( isDefault(cv->type) )
      assign(cv, type, var ? var->type : TypeAny);
  }

  succeed;
}

static StringObj
getSummaryClassVariable(ClassVariable cv)
{ Class class = cv->class;
  Variable var;

  if ( instanceOfObject(cv->summary, ClassString) )
    answer(cv->summary);

  if ( isDefault(cv->summary) &&
       (var = getInstanceVariableClass(class, cv->name)) )
  { if ( notNil(var->summary) )
      answer(var->summary);		/* TBD: getSummaryVariable() */
  }
					/* TBD: look for inheritence */
  fail;
}

		 /*******************************
		 *	  STRING --> VALUE	*
		 *******************************/

static status
convertFunctionRequiresName(Type t)
{ if ( t->kind == NAME_class )
  { Class cl = t->context;
    GetMethod m = getGetMethodClass(cl, NAME_convert);

    if ( m && m->types->size == ONE )
    { Type at = m->types->elements[0];

      if ( at == TypeName || at->kind == NAME_nameOf )
	succeed;
    }
  }

  fail;
}


static struct TAGop
{ char *name;
  int  priority;
  Name kind;
} operators[] =
{ { "?",    150, NAME_yfx},
  { ":=",   990, NAME_xfx},
  { "@=",   990, NAME_xfx},
  { "*",    400, NAME_yfx},
  { "/",    400, NAME_yfx},
  { "<",    700, NAME_xfx},
  { "=",    700, NAME_xfx},
  { "=<",   700, NAME_xfx},
  { ">=",   700, NAME_xfx},
  { "==",   700, NAME_xfx},
  { ">",    700, NAME_xfx},
  { "-",    500, NAME_yfx},
  { "-",    500, NAME_fx},
  { "\\==", 700, NAME_xfx},
  { "+",    500, NAME_yfx},
  { "+",    500, NAME_fx},
  { NULL,     0, NULL }
};


static Parser
TheObjectParser(void)
{ static Parser p;

  if ( !p )
  { SyntaxTable  st = newObject(ClassSyntaxTable, EAV);
    Tokeniser     t = newObject(ClassTokeniser, st, EAV);
    struct TAGop *o = operators;

    p = globalObject(NAME_objectParser, ClassParser, t, EAV);

    send(p, NAME_active, CtoName("@"),
	 newObject(ClassObtain, PCE, NAME_objectFromReference,
		   newObject(ClassObtain, RECEIVER, NAME_token, EAV),
		   EAV),
	 EAV);
    send(p, NAME_active, CtoName("["),
	 newObject(ClassObtain, RECEIVER, NAME_list,
		   CtoName("]"), CtoName(","), NAME_chain, EAV),
	 EAV);
    send(p, NAME_sendMethod,
	 newObject(ClassSendMethod,
		   NAME_syntaxError,
		   newObject(ClassVector, NAME_charArray, EAV),
		   newObject(ClassOr, EAV),
		   CtoString("Just fail on syntax-error"),
		   EAV),
	 EAV);

    for( ; o->name; o++)
      send(p, NAME_operator,
	   newObject(ClassOperator,
		     CtoName(o->name), toInt(o->priority), o->kind, EAV), EAV);
  }

  return p;
}


static Any
getConvertStringClassVariable(ClassVariable cv, CharArray value)
{ Any val;

  if ( cv->type->fullname == NAME_geometry )
    return checkType(value, cv->type, cv->context);

  if ( (val = qadGetv(TheObjectParser(), NAME_parse, 1, (Any *)&value)) )
    answer(checkType(val, cv->type, cv->context));

  if ( syntax.uppercase && specialisedType(cv->type, TypeName) )
  { val = CtoKeyword(strName(value));
    answer(checkType(val, cv->type, cv->context));
  }

  if ( specialisedType(cv->type, TypeCharArray) ||
       value->data.s_size == 0 )		/* empty atom */
    answer(checkType(value, cv->type, cv->context));

  if ( syntax.uppercase &&
       (specialisedType(cv->type, TypeName) ||
	convertFunctionRequiresName(cv->type)) )
    value = (CharArray) CtoKeyword(strName(value));

  if ( (val = checkType(value, cv->type, cv->context)) )
  { if ( !includesType(cv->type, nameToType(NAME_font)) )
      errorPce(cv, NAME_oldDefaultFormat, value);

    answer(val);
  }

  fail;
}


static ClassVariable
getSubClassVariable(ClassVariable cv, Class class)
{ if ( cv->context == class )
  { answer(cv);
  } else
  { Any val;
    Name name = class->name;

    if ( (val = getDefault(class, name, FALSE)) )
    { ClassVariable clone = get(cv, NAME_clone, EAV);

      assert(clone);
      contextClassVariable(clone, class);
      doneObject(val);			/* What to do with this? */

      answer(clone);
    } else
    { answer(cv);
    }
  }
}


static CharArray
getStringValueClassVariable(ClassVariable cv)
{ Any val;
  Class class = cv->context;

  if ( (val = getDefault(class, cv->name, TRUE)) )
    answer(val);

  fail;
}


Any
getValueClassVariable(ClassVariable cv)
{ if ( cv->value == NotObtained )
  { CharArray str;
    Any rval = FAIL;

    if ( (str = getStringValueClassVariable(cv)) )
    { if ( !(rval=qadGetv(cv, NAME_convertString, 1, (Any *)&str)) )
	errorPce(cv, NAME_cannotConvertDefault, str);
    }

    if ( !rval )
    { if ( onDFlag(cv, DCV_TEXTUAL) )
	rval = qadGetv(cv, NAME_convertString, 1, (Any *)&cv->cv_default);
      else
	rval = checkType(cv->cv_default, cv->type, cv->context);

      if ( !rval )
      { errorPce(cv, NAME_cannotConvertProgramDefault, cv->cv_default);
	fail;
      }
    }

    assign(cv, value, rval);
    if ( str )
      doneObject(str);
  }

  answer(cv->value);
}


static status
valueClassVariable(ClassVariable cv, Any value)
{ Any val;

  if ( (val = checkType(value, cv->type, cv->context)) )
  { assign(cv, value, val);

    succeed;
  }

  return errorTypeMismatch(cv,
			   getMethodFromFunction((Any(*)())valueClassVariable), 1,
			   cv->type,
			   value);
}


		/********************************
		*         CLASS CATCHALL	*
		********************************/

static void
fixInstanceProtoClass(Class class)
{ if ( class->realised == ON )
  { unallocInstanceProtoClass(class);

    if ( notNil(class->sub_classes) )
    { Cell cell;

      for_cell(cell, class->sub_classes)
	fixInstanceProtoClass(cell->value);
    }
  }
}


static status
appendClassVariableClass(Class class, ClassVariable cv)
{ Cell cell;

  fixInstanceProtoClass(class);
  realiseClass(class);

  for_cell(cell, class->class_variables)
  { ClassVariable r2 = cell->value;

    if ( r2->name == cv->name )
    { cellValueChain(class->class_variables, PointerToInt(cell), cv);
      succeed;
    }
  }

  appendChain(class->class_variables, cv);
  if ( notNil(class->class_variable_table) )
    appendHashTable(class->class_variable_table, cv->name, cv);

  succeed;
}


ClassVariable
getClassVariableClass(Class class, Name name)
{ ClassVariable cv;
  Cell cell;

  realiseClass(class);

  if ( isNil(class->class_variable_table) )
    assign(class, class_variable_table, newObject(ClassHashTable, EAV));
  else if ( (cv=getMemberHashTable(class->class_variable_table, name)) )
    answer(cv);

  for_cell(cell, class->class_variables)
  { cv = cell->value;

    if ( cv->name == name )
    { appendHashTable(class->class_variable_table, name, cv);
      answer(cv);
    }
  }

  if ( notNil(class->super_class) )
  { ClassVariable super = getClassVariableClass(class->super_class, name);

    if ( super )
    { cv = getSubClassVariable(super, class);
      appendHashTable(class->class_variable_table, name, cv);
      answer(cv);
    }
  }

  fail;
}


status
classVariableValueClass(Class cl, Name name, Any val)
{ ClassVariable cv;

  if ( (cv = getClassVariableClass(cl, name)) )
    return valueClassVariable(cv, val);

  fail;
}


Any
getClassVariableValueClass(Class cl, Name name)
{ ClassVariable cv;

  if ( (cv = getClassVariableClass(cl, name)) )
    answer(getValueClassVariable(cv));

  fail;
}


static bool
hasutf8(const char *s)
{ for(; *s; s++)
  { if ( (*s)&0x80 )
      return true;
  }

  return false;
}

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
NOTE: default value is *NOT* copied, so   the  caller must pass a string
that will not be deleted: either a   character constant or a value saved
using save_string.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

status
attach_class_variable(Class cl,
		      Name name, const char *type,
		      const char *def,
		      const char *doc)
{ ClassVariable cv;
  StringObj  s = (doc && strlen(doc) > 0 ? CtoString(doc) : DEFAULT);
  Name	    tp = (type ? CtoName(type) : DEFAULT);

					/* TBD: Default value! */
  if ( (cv = newObject(ClassClassVariable,
		       cl, name, DEFAULT, tp, s, EAV)) )
  { if ( hasutf8(def) )
      assign(cv, cv_default, UTF8ToString(def));
    else
      assign(cv, cv_default, staticCtoString(def));
    setDFlag(cv, DCV_TEXTUAL);		/* value is textual */

    succeed;
  }

  fail;
}


status
refine_class_variable(Class cl, const char *name_s, const char *def)
{ Class super;
  Name name = CtoName(name_s);

  for( super = cl->super_class; notNil(super); super = super->super_class)
  { Cell cell;

    for_cell(cell, super->class_variables)
    { ClassVariable cv = cell->value;

      if ( cv->name == name )		/* found it! */
      { ClassVariable cv2;

	if ( (cv2 = newObject(ClassClassVariable,
			      cl, name, DEFAULT, cv->type, cv->summary, EAV)) )
	{ assign(cv2, cv_default, staticCtoString(def));
	  setDFlag(cv2, DCV_TEXTUAL);		/* value is textual */

	  succeed;
	}
	assert(0);
      }
    }
  }

  sysPce("Could not find super-class-variable to refine %s.%s\n",
	 pp(cl->name), name_s);
  fail;					/* NOTREACHED */
}


		/********************************
		*         MANUAL SUPPORT	*
		********************************/


static Name
getManIdClassVariable(ClassVariable cv)
{ wchar_t buf[LINESIZE];
  wchar_t *nm, *o;
  Name ctx = ((Class)cv->context)->name;
  size_t len;
  Name rc;

  len = 4 + ctx->data.s_size + cv->name->data.s_size;
  if ( len < LINESIZE )
    nm = buf;
  else
    nm = pceMalloc(sizeof(wchar_t)*len);

  o = nm;
  *o++ = 'R';
  *o++ = '.';
  wcscpy(o, nameToWC(ctx, &len)); o += len;
  *o++ = '.';
  wcscpy(o, nameToWC(cv->name, &len)); o += len;

  rc = WCToName(nm, o-nm);
  if ( nm != buf )
    pceFree(nm);

  answer(rc);
}


static Name
getManIndicatorClassVariable(ClassVariable cv)
{ answer(CtoName("R"));			/* TBD: may be a class-variable :-) */
}


static StringObj
getManSummaryClassVariable(ClassVariable cv)
{ TextBuffer tb;
  StringObj str;
  StringObj tmp;

  tb = newObject(ClassTextBuffer, EAV);
  tb->undo_buffer_size = ZERO;
  CAppendTextBuffer(tb, "R\t");

  appendTextBuffer(tb, (CharArray)((Class)cv->context)->name, ONE);
  CAppendTextBuffer(tb, ".");
  appendTextBuffer(tb, (CharArray)cv->name, ONE);
  CAppendTextBuffer(tb, ": ");
  appendTextBuffer(tb, (CharArray)getCapitaliseName(cv->type->fullname), ONE);

  if ( (tmp = getSummaryClassVariable(cv)) )
  { CAppendTextBuffer(tb, "\t");
    appendTextBuffer(tb, (CharArray)tmp, ONE);
  }
  if ( send(cv, NAME_hasHelp, EAV) )
    CAppendTextBuffer(tb, " (+)");

  str = getContentsTextBuffer(tb, ZERO, DEFAULT);
  doneObject(tb);

  answer(str);
}


static Name
getPrintNameClassVariable(ClassVariable cv)
{ wchar_t buf[LINESIZE];
  wchar_t *nm, *o;
  Name ctx = ((Class)cv->context)->name;
  size_t len;
  Name rc;

  len = 2 + ctx->data.s_size + cv->name->data.s_size;
  if ( len < LINESIZE )
    nm = buf;
  else
    nm = pceMalloc(sizeof(wchar_t)*len);

  o = nm;
  wcscpy(o, nameToWC(ctx, &len)); o += len;
  *o++ = '.';
  wcscpy(o, nameToWC(cv->name, &len)); o += len;

  rc = WCToName(nm, o-nm);
  if ( nm != buf )
    pceFree(nm);

  answer(rc);
}


static Name
getGroupClassVariable(ClassVariable cv)
{ Variable var;

  if ( (var = getInstanceVariableClass(cv->context, cv->name)) )
    answer(getGroupVariable(var));

  fail;
}

		 /*******************************
		 *	     BEHAVIOUR		*
		 *******************************/

static Any
getGetClassVariable(ClassVariable var, Any rec)
{ answer(getValueClassVariable(var));
}

		 /*******************************
		 *	 CLASS DECLARATION	*
		 *******************************/

/* Type declarations */

static char *T_initialise[] =
	{ "class=class", "name=name", "default=any",
	  "type=[type]", "summary=[string]*" };

/* Instance Variables */

static vardecl var_class_variable[] =
{ IV(NAME_type, "type", IV_GET,
     NAME_type, "Type of the class-variable"),
  IV(NAME_value, "any", IV_NONE,
     NAME_cache, "Current value"),
  IV(NAME_default, "any", IV_GET,
     NAME_default, "Program default value"),
  IV(NAME_summary, "[string]*", IV_GET,
     NAME_manual, "Summary documentation")
};

/* Send Methods */

static senddecl send_class_variable[] =
{ SM(NAME_initialise, 5, T_initialise, initialiseClassVariable,
     DEFAULT, "Create and associate to class"),
  SM(NAME_value, 1, "any", valueClassVariable,
     NAME_value, "Set value of the class variable")
};

/* Get Methods */

static getdecl get_class_variable[] =
{ GM(NAME_group, 0, "name", NULL, getGroupClassVariable,
     NAME_manual, "Same as related variable"),
  GM(NAME_manId, 0, "name", NULL, getManIdClassVariable,
     NAME_manual, "Card Id for class variable"),
  GM(NAME_manIndicator, 0, "name", NULL, getManIndicatorClassVariable,
     NAME_manual, "Manual type indicator (`R')"),
  GM(NAME_manSummary, 0, "string", NULL, getManSummaryClassVariable,
     NAME_manual, "New string with documentation summary"),
  GM(NAME_printName, 0, "name", NULL, getPrintNameClassVariable,
     NAME_textual, "class.name"),
  GM(NAME_convertString, 1, "any|function", "textual=char_array",
     getConvertStringClassVariable,
     NAME_value, "Convert textual value into typed value"),
  GM(NAME_stringValue, 0, "char_array", NULL, getStringValueClassVariable,
     NAME_value, "Obtain and return value as a char_array"),
  GM(NAME_value, 0, "any", NULL, getValueClassVariable,
     NAME_value, "Compute and return the value"),
  GM(NAME_get, 1, "unchecked", "object", getGetClassVariable,
     NAME_execute, "Invoke (read) class-variable")
};

/* ClassVariables */

#define rc_class_variable NULL
/*
static classvardecl rc_class_variable[] =
{
};
*/

/* Class Declaration */

static Name cv_termnames[] = { NAME_context, NAME_name, NAME_default,
			       NAME_type, NAME_summary };

ClassDecl(class_variable_decls,
	  var_class_variable, send_class_variable, get_class_variable, rc_class_variable,
	  5, cv_termnames,
	  "$Rev$");


status
makeClassClassVariable(Class class)
{ declareClass(class, &class_variable_decls);

  cloneStyleVariableClass(class, NAME_summary, NAME_reference);
  cloneStyleVariableClass(class, NAME_value,   NAME_reference);

  NotObtained=globalObject(NAME_notObtained, ClassConstant,
			   NAME_notObtained,
			   CtoString("Value of not-obtained class-variable"),
			   EAV);

  succeed;
}

		 /*******************************
		 *    FETCH FROM Defaults file	*
		 *******************************/

static ChainTable ClassVariableTable;
static Name name_star;			/* '*' */

#define LBUFSIZE 256			/* initial value buffer */
#define MAXFIELDS 10			/* Max # x.y.z... fields */

static void
add_class_variable(int nfields, Name *fields, StringObj value)
{ if ( nfields > 0 )
  { Name resname = fields[nfields-1];

    if ( resname != name_star )
    { Any argv[10];
      int i, argc;

      for(argc = 0, i=0; i < (nfields-1); i++)
	argv[argc++] = fields[i];
      argv[argc++] = value;

      appendChainTable(ClassVariableTable, resname,
		       newObjectv(ClassVector, argc, argv));
    }
  }
}


static char *
matchword(const char *s, const char *m)
{ while(*m && *s == *m)
    m++, s++;

  if ( !*m && isspace(*s) )
    return (char *)s;

  return NULL;
}


static StringObj
restline(const char *s)
{ string str;
  const char *e;

  e = s+strlen(s);
  while(e > s && isspace(e[-1]) )
    e--;
  str_set_n_ascii(&str, e-s, (char *)s);

  return StringToString(&str);
}


static status
loadDefaultClassVariables(SourceSink f)
{ int lineno = 0;
  IOSTREAM *fd;

  if ( (fd = Sopen_object(f, "rbr")) )
  { char line[LINESIZE];

    while( Sfgets(line, sizeof(line), fd) )
    { char *s = line;
      char *e;
      Name fields[MAXFIELDS];
      int nfields = 0;
      StringObj value;

      lineno++;

      while(isblank(*s) || *s == '\r')
	s++;
      if ( s[0] == '!' || s[0] == '\n' )
	continue;

      if ( s[0] == '#' )		/* #include file */
      { s++;
	while(isblank(*s))
	  s++;
	if ( (s = matchword(s, "include")) )
	{ while(isblank(*s))
	    s++;
	  if ( s )
	  { StringObj fn = restline(s);
	    Any fincluded = newObject(ClassFile, fn, NAME_utf8, EAV);

	    if ( send(fincluded, NAME_exists, EAV) )
	      loadDefaultClassVariables(fincluded);

	    doneObject(fincluded);
	  }
	}
	continue;
      }

      for(;;)
      { if ( iscsym(*s) )
	{ string str;

	  for(e=s; iscsym(*e); e++)
	    ;
	  str_set_n_ascii(&str, e-s, s);
	  fields[nfields++] = StringToName(&str);
	  s = e;
	  DEBUG(NAME_default, Cprintf("found %s\n", pp(fields[nfields-1])));
	  continue;
	}

	if ( *s == '*' )
	{ fields[nfields++] = name_star;
	  DEBUG(NAME_default, Cprintf("found %s\n", pp(fields[nfields-1])));
	  s++;
	  continue;
	}

	if ( *s == '.' )		/* field separator */
	{ s++;
	  continue;
	}

	if ( *s == ':' )		/* value separator */
	{ char localbuf[LBUFSIZE];
	  char *buf = localbuf;
	  int bufsize = LBUFSIZE;
	  int size = 0;
	  int l;
	  string str;

	  s++;				/* skip the ':' */

	  for(;;)
	  { for(s++; isblank(*s); s++)
	      ;
	    l = (int)strlen(s);
					/* delete [\r\n]*$ */
	    while( l > 0 && (s[l-1] == '\n' || s[l-1] == '\r') )
	      s[--l] = EOS;
					/* make buffer big enough */
	    while ( size + l > bufsize )
	    { bufsize *= 2;
	      if ( buf == localbuf )
	      { buf = pceMalloc(bufsize);
		strncpy(buf, localbuf, size);
	      } else
		buf = pceRealloc(buf, bufsize);
	    }

					/* copy the new line to the buf */
	    strncpy(&buf[size], s, l);
	    size += l;

					/* continue if ended in a `\' */
	    if ( s[l-1] == '\\' )
	    { buf[size-1] = ' ';
	      if ( !Sfgets(line, sizeof(line), fd) )
	      { errorPce(PCE, NAME_defaultSyntaxError, f, toInt(lineno));
		goto out;
	      }
	      s = line;

	      continue;
	    }

	    break;
	  }

	  str_set_n_ascii(&str, size, buf);
	  value = StringToString(&str);
	  DEBUG(NAME_default, Cprintf("Value = %s\n", pp(value)));
	  add_class_variable(nfields, fields, value);
	  if ( buf != localbuf )
	    pceFree(buf);
	  goto next;
	} else
	{ errorPce(PCE, NAME_defaultSyntaxError, f, toInt(lineno));
	  goto next;
	}
      }
    next:
      ;
    }
    out:
      ;

    Sclose(fd);
    succeed;
  }

  fail;
}


status
loadDefaultsPce(Pce pce, SourceSink from)
{ if ( !ClassVariableTable )
    ClassVariableTable = globalObject(NAME_defaultTable, ClassChainTable, EAV);

  if ( isDefault(from) )
    from = checkType(pce->defaults, nameToType(NAME_file), pce);

  if ( from && send(from, NAME_access, NAME_read, EAV) )
  { loadDefaultClassVariables(from);

    succeed;
  }

  fail;
}


static int
class_match(Class class, Name name)
{ int ok = 100;

  for( ; notNil(class); class = class->super_class, ok-- )
  { if ( class->name == name )
      return ok;
  }

  return 0;				/* no match */
}



static StringObj
getDefault(Class class, Name name, int accept_default)
{ Chain ch;
  static int initialized = FALSE;

  if ( !initialized )
  { Code code;

    initialized = TRUE;

    name_star = CtoName("*");

    if ( !ClassVariableTable )
      loadDefaultsPce(PCE, DEFAULT);

    if ( (code = getClassVariableValueObject(PCE, NAME_initialise)) &&
	 instanceOfObject(code, ClassCode) )
      forwardReceiverCodev(code, PCE, 0, NULL);
  }

  ch = getMemberHashTable((HashTable)ClassVariableTable, name);

  if ( ch )
  { Vector best = NIL;
    int bestok = -1;
    Cell cell;

    for_cell(cell, ch)
    { Vector v = cell->value;
      int size = valInt(v->size);
      Any *elements = v->elements;
      int ok = 0;

      if ( size == 2 )			/* class.attribute */
      { Name cname = elements[0];

	if ( accept_default && cname == name_star )
	  ok = 10;
	else
	  ok = class_match(class, cname);

	DEBUG(NAME_default, Cprintf("%s using %s: ok = %d (e0=%s)\n",
				     pp(name), pp(v), ok, pp(cname)));

      }

      if ( ok && ok >= bestok )
      { best = v;
	bestok = ok;
      }
    }

    if ( notNil(best) )
      return getTailVector(best);
  }

  fail;					/* uses the default */
}
