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/* Copyright (C) 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: zmisc3.c,v 1.6 2004/08/04 19:36:13 stefan Exp $ */
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/* Miscellaneous LanguageLevel 3 operators */
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#include "ghost.h"
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#include "gscspace.h" /* for gscolor2.h */
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#include "gsmatrix.h" /* ditto */
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#include "gsclipsr.h"
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#include "gscolor2.h"
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#include "oper.h"
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#include "igstate.h"
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#include "store.h"
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/* - clipsave - */
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private int
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zclipsave(i_ctx_t *i_ctx_p)
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{
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return gs_clipsave(igs);
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}
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/* - cliprestore - */
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private int
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zcliprestore(i_ctx_t *i_ctx_p)
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{
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return gs_cliprestore(igs);
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}
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/* <proc1> <proc2> .eqproc <bool> */
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/*
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* Test whether two procedures are equal to depth 10.
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* This is the equality test used by idiom recognition in 'bind'.
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*/
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#define MAX_DEPTH 10 /* depth is per Adobe specification */
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typedef struct ref2_s {
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ref proc1, proc2;
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} ref2_t;
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private int
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zeqproc(i_ctx_t *i_ctx_p)
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{
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os_ptr op = osp;
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ref2_t stack[MAX_DEPTH + 1];
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ref2_t *top = stack;
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make_array(&stack[0].proc1, 0, 1, op - 1);
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make_array(&stack[0].proc2, 0, 1, op);
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for (;;) {
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long i;
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if (r_size(&top->proc1) == 0) {
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/* Finished these arrays, go up to next level. */
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if (top == stack) {
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/* We're done matching: it succeeded. */
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make_true(op - 1);
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pop(1);
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return 0;
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}
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--top;
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continue;
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}
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/* Look at the next elements of the arrays. */
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i = r_size(&top->proc1) - 1;
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array_get(imemory, &top->proc1, i, &top[1].proc1);
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array_get(imemory, &top->proc2, i, &top[1].proc2);
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r_dec_size(&top->proc1, 1);
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++top;
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/*
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* Amazingly enough, the objects' executable attributes are not
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* required to match. This means { x load } will match { /x load },
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* even though this is clearly wrong.
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*/
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#if 0
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if (r_has_attr(&top->proc1, a_executable) !=
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r_has_attr(&top->proc2, a_executable)
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)
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break;
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#endif
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if (obj_eq(imemory, &top->proc1, &top->proc2)) {
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/* Names don't match strings. */
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if (r_type(&top->proc1) != r_type(&top->proc2) &&
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(r_type(&top->proc1) == t_name ||
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r_type(&top->proc2) == t_name)
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)
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break;
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--top; /* no recursion */
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continue;
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}
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if (r_is_array(&top->proc1) && r_is_array(&top->proc2) &&
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r_size(&top->proc1) == r_size(&top->proc2) &&
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top < stack + (MAX_DEPTH - 1)
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) {
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/* Descend into the arrays. */
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continue;
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}
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break;
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}
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/* An exit from the loop indicates that matching failed. */
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make_false(op - 1);
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pop(1);
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return 0;
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}
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/* ------ Initialization procedure ------ */
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const op_def zmisc3_op_defs[] =
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{
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op_def_begin_ll3(),
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{"0cliprestore", zcliprestore},
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{"0clipsave", zclipsave},
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{"2.eqproc", zeqproc},
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op_def_end(0)
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};
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