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/* Copyright (C) 1992, 1995, 1996, 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
This software is licensed to a single customer by Artifex Software Inc.
under the terms of a specific OEM agreement.
*/
/*$RCSfile$ $Revision$ */
/* Miscellaneous Level 2 operators */
#include "memory_.h"
#include "string_.h"
#include "ghost.h"
#include "oper.h"
#include "estack.h"
#include "iddict.h"
#include "idparam.h"
#include "iparam.h"
#include "dstack.h"
#include "ilevel.h"
#include "iname.h"
#include "iutil2.h"
#include "ivmspace.h"
#include "store.h"
/* Forward references */
private int set_language_level(P2(i_ctx_t *, int));
/* ------ Language level operators ------ */
/* - .languagelevel <int> */
private int
zlanguagelevel(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
push(1);
make_int(op, LANGUAGE_LEVEL);
return 0;
}
/* <int> .setlanguagelevel - */
private int
zsetlanguagelevel(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
int code = 0;
check_type(*op, t_integer);
if (op->value.intval != LANGUAGE_LEVEL) {
code = set_language_level(i_ctx_p, (int)op->value.intval);
if (code < 0)
return code;
}
LANGUAGE_LEVEL = op->value.intval;
pop(1);
return code;
}
/* ------ Initialization procedure ------ */
/* The level setting ops are recognized even in Level 1 mode. */
const op_def zmisc2_op_defs[] =
{
{"0.languagelevel", zlanguagelevel},
{"1.setlanguagelevel", zsetlanguagelevel},
op_def_end(0)
};
/* ------ Internal procedures ------ */
/*
* Adjust the interpreter for a change in language level.
* This is used for the .setlanguagelevel operator,
* and (perhaps someday) after a restore.
*/
private int swap_level_dict(P2(i_ctx_t *i_ctx_p, const char *dict_name));
private int swap_entry(P4(i_ctx_t *i_ctx_p, ref elt[2], ref * pdict,
ref * pdict2));
private int
set_language_level(i_ctx_t *i_ctx_p, int new_level)
{
int old_level = LANGUAGE_LEVEL;
ref *pgdict = /* globaldict, if present */
ref_stack_index(&d_stack, ref_stack_count(&d_stack) - 2);
ref *level2dict;
int code = 0;
if (new_level < 1 ||
new_level >
(dict_find_string(systemdict, "ll3dict", &level2dict) > 0 ? 3 : 2)
)
return_error(e_rangecheck);
if (dict_find_string(systemdict, "level2dict", &level2dict) <= 0)
return_error(e_undefined);
/*
* As noted in dstack.h, we allocate the extra d-stack entry for
* globaldict even in Level 1 mode; in Level 1 mode, this entry
* holds an extra copy of systemdict, and [count]dictstack omit the
* very bottommost entry.
*/
while (new_level != old_level) {
switch (old_level) {
case 1: { /* 1 => 2 or 3 */
/* Put globaldict in the dictionary stack. */
ref *pdict;
/*
* This might be called so early in initialization that
* globaldict hasn't been defined yet. If so, just skip
* this step.
*/
code = dict_find_string(level2dict, "globaldict", &pdict);
if (code > 0) {
if (!r_has_type(pdict, t_dictionary))
return_error(e_typecheck);
*pgdict = *pdict;
}
/* Set other flags for Level 2 operation. */
dict_auto_expand = true;
}
code = swap_level_dict(i_ctx_p, "level2dict");
if (code < 0)
return code;
++old_level;
continue;
case 3: /* 3 => 1 or 2 */
code = swap_level_dict(i_ctx_p, "ll3dict");
if (code < 0)
return code;
--old_level;
continue;
default: /* 2 => 1 or 3 */
break;
}
switch (new_level) {
case 1: { /* 2 => 1 */
/*
* Clear the cached definition pointers of all names defined
* in globaldict. This will slow down future lookups, but
* we don't care.
*/
int index = dict_first(pgdict);
ref elt[2];
while ((index = dict_next(pgdict, index, &elt[0])) >= 0)
if (r_has_type(&elt[0], t_name))
name_invalidate_value_cache(&elt[0]);
/* Overwrite globaldict in the dictionary stack. */
*pgdict = *systemdict;
/* Set other flags for Level 1 operation. */
dict_auto_expand = false;
}
code = swap_level_dict(i_ctx_p, "level2dict");
break;
case 3: /* 2 => 3 */
code = swap_level_dict(i_ctx_p, "ll3dict");
break;
default: /* not possible */
return_error(e_Fatal);
}
break;
}
dict_set_top(); /* reload dict stack cache */
return code;
}
/*
* Swap the contents of a level dictionary (level2dict or ll3dict) and
* systemdict. If a value in the level dictionary is itself a dictionary,
* and it contains a key/value pair referring to itself, swap its contents
* with the contents of the same dictionary in systemdict. (This is a hack
* to swap the contents of statusdict.)
*/
private int
swap_level_dict(i_ctx_t *i_ctx_p, const char *dict_name)
{
ref *leveldict;
int index;
ref elt[2]; /* key, value */
ref *subdict;
if (dict_find_string(systemdict, dict_name, &leveldict) <= 0)
return_error(e_undefined);
index = dict_first(leveldict);
while ((index = dict_next(leveldict, index, &elt[0])) >= 0)
if (r_has_type(&elt[1], t_dictionary) &&
dict_find(&elt[1], &elt[0], &subdict) > 0 &&
obj_eq(&elt[1], subdict)
) {
/* elt[1] is the 2nd-level sub-dictionary */
int isub = dict_first(&elt[1]);
ref subelt[2];
int found = dict_find(systemdict, &elt[0], &subdict);
if (found <= 0)
continue;
while ((isub = dict_next(&elt[1], isub, &subelt[0])) >= 0)
if (!obj_eq(&subelt[0], &elt[0])) {
/* don't swap dict itself */
int code = swap_entry(i_ctx_p, subelt, subdict, &elt[1]);
if (code < 0)
return code;
}
} else {
int code = swap_entry(i_ctx_p, elt, systemdict, leveldict);
if (code < 0)
return code;
}
return 0;
}
/*
* Swap an entry from a higher level dictionary into a base dictionary.
* elt[0] is the key, elt[1] is the current value in the Level 2 dictionary
* (*pdict2).
*/
private int
swap_entry(i_ctx_t *i_ctx_p, ref elt[2], ref * pdict, ref * pdict2)
{
ref *pvalue;
ref old_value; /* current value in *pdict */
int found = dict_find(pdict, &elt[0], &pvalue);
switch (found) {
default: /* <0, error */
/*
* The only possible error here is a dictfull error, which is
* harmless.
*/
/* fall through */
case 0: /* missing */
make_null(&old_value);
break;
case 1: /* present */
old_value = *pvalue;
}
/*
* Temporarily flag the dictionaries as local, so that we don't
* get invalidaccess errors. (We know that they are both
* referenced from systemdict, so they are allowed to reference
* local objects even if they are global.)
*/
{
uint space2 = r_space(pdict2);
int code;
r_set_space(pdict2, avm_local);
idict_put(pdict2, &elt[0], &old_value);
if (r_has_type(&elt[1], t_null)) {
code = idict_undef(pdict, &elt[0]);
if (code == e_undefined &&
r_has_type(&old_value, t_null)
)
code = 0;
} else {
uint space = r_space(pdict);
r_set_space(pdict, avm_local);
code = idict_put(pdict, &elt[0], &elt[1]);
r_set_space(pdict, space);
}
r_set_space(pdict2, space2);
return code;
}
}
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