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- /* Copyright (C) 1989, 1992 Aladdin Enterprises. All rights reserved.
- Distributed by Free Software Foundation, Inc.
-
- This file is part of Ghostscript.
-
- Ghostscript is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- to anyone for the consequences of using it or for whether it serves any
- particular purpose or works at all, unless he says so in writing. Refer
- to the Ghostscript General Public License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- Ghostscript, but only under the conditions described in the Ghostscript
- General Public License. A copy of this license is supposed to have been
- given to you along with Ghostscript so you can know your rights and
- responsibilities. It should be in a file named COPYING. Among other
- things, the copyright notice and this notice must be preserved on all
- copies. */
-
- /* zdict.c */
- /* Dictionary operators for GhostScript */
- #include "ghost.h"
- #include "errors.h"
- #include "oper.h"
- #include "dict.h"
- #include "dstack.h"
- #include "name.h" /* for dict_find_name */
- #include "store.h"
-
- /* dict */
- int
- zdict(register os_ptr op)
- { check_type(*op, t_integer);
- if ( op->value.intval < 0 || op->value.intval > dict_max_size )
- return e_rangecheck;
- return dict_create((uint)op->value.intval, op);
- }
-
- /* maxlength */
- int
- zmaxlength(register os_ptr op)
- { check_type(*op, t_dictionary);
- check_dict_read(*op);
- make_int(op, dict_maxlength(op));
- return 0;
- }
-
- /* setmaxlength */
- int
- zsetmaxlength(register os_ptr op)
- { uint new_size;
- int code;
- os_ptr op1 = op - 1;
- check_type(*op1, t_dictionary);
- check_dict_write(*op1);
- check_type(*op, t_integer);
- if ( op->value.intval < 0 || op->value.intval > dict_max_size )
- return e_rangecheck;
- new_size = (uint)op->value.intval;
- if ( dict_length(op - 1) > new_size )
- return e_dictfull;
- code = dict_resize(op - 1, new_size);
- if ( code >= 0 ) pop(2);
- return code;
- }
-
- /* begin */
- int
- zbegin(register os_ptr op)
- { check_type(*op, t_dictionary);
- check_dict_read(*op);
- if ( dsp == dstop ) return e_dictstackoverflow;
- ++dsp;
- ref_assign(dsp, op);
- pop(1);
- return 0;
- }
-
- /* end */
- int
- zend(register os_ptr op)
- { if ( dsp == dstack + (min_dstack_size - 1) )
- return e_dictstackunderflow;
- dsp--;
- return 0;
- }
-
- /* def */
- /* We make this into a separate procedure because */
- /* the interpreter will almost always call it directly. */
- int
- zop_def(register os_ptr op)
- { check_op(2);
- if ( r_has_type(op - 1, t_null) ) return e_typecheck;
- check_dict_write(*dsp);
- return dict_put(dsp, op - 1, op);
- }
- int
- zdef(os_ptr op)
- { int code = zop_def(op);
- if ( !code ) { pop(2); }
- return code;
- }
-
- /* load */
- int
- zload(register os_ptr op)
- { ref *pvalue;
- check_op(1);
- if ( r_has_type(op, t_null) ) return e_typecheck;
- if ( r_has_type(op, t_name) )
- { /* Use the fast lookup */
- if ( (pvalue = dict_find_name(op)) == 0 )
- return e_undefined;
- }
- else
- { if ( dict_lookup(dstack, dsp, op, &pvalue) <= 0 )
- return e_undefined;
- }
- ref_assign(op, pvalue);
- return 0;
- }
-
- /* store */
- int
- zstore(register os_ptr op)
- { ref *pvalue;
- int code;
- check_op(2);
- if ( r_has_type(op - 1, t_null) ) return e_typecheck;
- if ( dict_lookup(dstack, dsp, op - 1, &pvalue) <= 0 )
- { code = dict_put(dsp, op - 1, op);
- if ( code ) return code;
- }
- else
- ref_assign_old(pvalue, op, "store");
- pop(2);
- return 0;
- }
-
- /* get - implemented in zgeneric.c */
-
- /* put - implemented in zgeneric.c */
-
- /* undef */
- int
- zundef(register os_ptr op)
- { check_type(op[-1], t_dictionary);
- check_dict_write(op[-1]);
- if ( !r_has_type(op, t_null) )
- dict_undef(op - 1, op); /* ignore undefined error */
- pop(2);
- return 0;
- }
-
- /* known */
- int
- zknown(register os_ptr op)
- { os_ptr op1 = op - 1;
- ref *pvalue;
- check_type(*op1, t_dictionary);
- check_dict_read(*op1);
- make_bool(op1,
- (r_has_type(op, t_null) ? 0 :
- dict_find(op1, op, &pvalue) > 0 ? 1 : 0));
- pop(1);
- return 0;
- }
-
- /* where */
- int
- zwhere(register os_ptr op)
- { const ref *pdref = dsp;
- ref *pvalue;
- check_op(1);
- if ( r_has_type(op, t_null) )
- { make_bool(op, 0);
- return 0;
- }
- while ( 1 )
- { check_dict_read(*pdref);
- if ( dict_find(pdref, op, &pvalue) > 0 ) break;
- if ( --pdref < dstack )
- { make_bool(op, 0);
- return 0;
- }
- }
- ref_assign(op, pdref);
- push(1);
- make_bool(op, 1);
- return 0;
- }
-
- /* copy for dictionaries -- called from zcopy in zgeneric.c. */
- /* Only the type of *op has been checked. */
- int
- zcopy_dict(register os_ptr op)
- { os_ptr op1 = op - 1;
- check_type(*op1, t_dictionary);
- check_dict_read(*op1);
- check_dict_write(*op);
- if ( !dict_auto_expand && (dict_length(op) != 0 || dict_maxlength(op) < dict_length(op1)) )
- return e_rangecheck;
- dict_copy(op1, op);
- ref_assign(op - 1, op);
- pop(1);
- return 0;
- }
-
- /* currentdict */
- int
- zcurrentdict(register os_ptr op)
- { push(1);
- ref_assign(op, dsp);
- return 0;
- }
-
- /* countdictstack */
- int
- zcountdictstack(register os_ptr op)
- { push(1);
- make_int(op, dsp - dstack + 1);
- return 0;
- }
-
- /* dictstack */
- int
- zdictstack(register os_ptr op)
- { int depth = dsp - dstack + 1;
- check_write_type(*op, t_array);
- if ( depth > r_size(op) ) return e_rangecheck;
- r_set_size(op, depth);
- refcpy_to_old(op->value.refs, dstack, depth, "dictstack");
- return 0;
- }
-
- /* cleardictstack */
- int
- zcleardictstack(os_ptr op)
- { dsp = dstack + (min_dstack_size - 1);
- return 0;
- }
-
- /* ------ Initialization procedure ------ */
-
- op_def zdict_op_defs[] = {
- {"0cleardictstack", zcleardictstack},
- {"1begin", zbegin},
- {"0countdictstack", zcountdictstack},
- {"0currentdict", zcurrentdict},
- {"2def", zdef},
- {"1dict", zdict},
- {"0dictstack", zdictstack},
- {"0end", zend},
- {"2known", zknown},
- {"1load", zload},
- {"1maxlength", zmaxlength},
- {"2setmaxlength", zsetmaxlength},
- {"2store", zstore},
- {"2undef", zundef},
- {"1where", zwhere},
- op_def_end(0)
- };
-