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/* Copyright (C) 1996, 1997, 1998 Aladdin Enterprises. All rights reserved.
Unauthorized use, copying, and/or distribution prohibited.
*/
/* pcmacros.c */
/* PCL5 macro commands */
#include "stdio_.h" /* std.h + NULL */
#include "pcommand.h"
#include "pcstate.h"
#include "pcparse.h"
/* ---------------- Macro execution ---------------- */
/* Execute a macro. We're willing to use C recursion for this because */
/* the PCL5 specification only allows 2 levels of call. */
private int
do_copies(pcl_state_t *psaved, pcl_state_t *pcs,
pcl_copy_operation_t copy)
{ const pcl_init_t **init = pcl_init_table;
int code = 0;
for ( ; *init && code >= 0; ++init )
if ( (*init)->do_copy )
code = (*(*init)->do_copy)(psaved, pcs, copy);
return code;
}
int
pcl_execute_macro(const pcl_macro_t *pmac, pcl_state_t *pcs,
pcl_copy_operation_t before, pcl_reset_type_t reset,
pcl_copy_operation_t after)
{ pcl_parser_state_t state;
pcl_state_t saved;
stream_cursor_read r;
int code;
if ( before )
{ memcpy(&saved, pcs, sizeof(*pcs));
do_copies(&saved, pcs, before);
pcs->saved = &saved;
}
if ( reset )
pcl_do_resets(pcs, reset);
pcl_process_init(&state);
r.ptr = (const byte *)(pmac + 1) - 1;
r.limit =
(const byte *)pmac + (gs_object_size(pcs->memory, pmac) - 1);
pcs->macro_level++;
code = pcl_process(&state, pcs, &r);
pcs->macro_level--;
if ( after )
{ do_copies(&saved, pcs, after);
memcpy(pcs, &saved, sizeof(*pcs));
}
return code;
}
/* ---------------- Commands ---------------- */
/* Define the macro control operations. */
enum {
macro_end_definition = 1,
macro_execute = 2,
macro_call = 3,
macro_delete_temporary = 7
};
private int /* ESC & f <mc_enum> X */
pcl_macro_control(pcl_args_t *pargs, pcl_state_t *pcs)
{ int i = int_arg(pargs);
gs_const_string key;
void *value;
pl_dict_enum_t denum;
if ( i == macro_end_definition )
{ if ( pcs->defining_macro )
{ /* The parser has included everything through this command */
/* in the macro_definition, so we can finish things up. */
int code;
code = pl_dict_put(&pcs->macros, current_macro_id,
current_macro_id_size, pcs->macro_definition);
pcs->defining_macro = false;
pcs->macro_definition = 0;
return code;
}
}
else if ( pcs->defining_macro )
return 0; /* don't execute other macro operations */
else if ( i == macro_execute || i == macro_call )
{ /*
* TRM 12-9 says that "two levels of nesting are allowed",
* which means 3 levels of macros (1 non-nested, 2 nested).
*/
if ( pcs->macro_level > 2 )
return 0;
}
else if ( pcs->macro_level )
return e_Range; /* macro operations not allowed inside macro */
switch ( i )
{
case 0:
{ /* Start defining <macro_id>. */
pcl_macro_t *pmac;
pl_dict_undef_purge_synonyms(&pcs->macros, current_macro_id, current_macro_id_size);
pmac = (pcl_macro_t *)
gs_alloc_bytes(pcs->memory, sizeof(pcl_macro_t),
"begin macro definition");
if ( pmac == 0 )
return_error(e_Memory);
pmac->storage = pcds_temporary;
pcs->macro_definition = (byte *)pmac;
pcs->defining_macro = true;
return 0;
}
case macro_end_definition: /* 1 */
{ /* Stop defining macro. Outside a macro, this is an error. */
return e_Range;
}
case macro_execute: /* 2 */
{ /* Execute <macro_id>. */
void *value;
if ( !pl_dict_find(&pcs->macros, current_macro_id, current_macro_id_size,
&value)
)
return 0;
return pcl_execute_macro((const pcl_macro_t *)value, pcs,
pcl_copy_none, pcl_reset_none, pcl_copy_none);
}
case macro_call: /* 3 */
{ /* Call <macro_id>, saving and restoring environment. */
void *value;
if ( !pl_dict_find(&pcs->macros, current_macro_id, current_macro_id_size,
&value)
)
return 0;
return pcl_execute_macro((const pcl_macro_t *)value, pcs,
pcl_copy_before_call, pcl_reset_none,
pcl_copy_after_call);
}
case 4:
{ /* Define <macro_id> as automatic overlay. */
pcs->overlay_macro_id = pcs->macro_id;
pcs->overlay_enabled = true;
return 0;
}
case 5:
{ /* Cancel automatic overlay. */
pcs->overlay_enabled = false;
return 0;
}
case 6:
{ /* Delete all macros. */
pl_dict_release(&pcs->macros);
return 0;
}
case macro_delete_temporary: /* 7 */
{ /* Delete temporary macros. */
pl_dict_enum_stack_begin(&pcs->macros, &denum, false);
while ( pl_dict_enum_next(&denum, &key, &value) )
if ( ((pcl_macro_t *)value)->storage == pcds_temporary )
pl_dict_undef_purge_synonyms(&pcs->macros, key.data, key.size);
return 0;
}
case 8:
{ /* Delete <macro_id>. */
pl_dict_undef_purge_synonyms(&pcs->macros, current_macro_id, current_macro_id_size);
return 0;
}
case 9:
{ /* Make <macro_id> temporary. */
if ( pl_dict_find(&pcs->macros, current_macro_id, current_macro_id_size, &value) )
((pcl_macro_t *)value)->storage = pcds_temporary;
return 0;
}
case 10:
{ /* Make <macro_id> permanent. */
if ( pl_dict_find(&pcs->macros, current_macro_id, current_macro_id_size, &value) )
((pcl_macro_t *)value)->storage = pcds_permanent;
return 0;
}
default:
return e_Range;
}
}
private int /* ESC & f <id> Y */
pcl_assign_macro_id(pcl_args_t *pargs, pcl_state_t *pcs)
{ uint id = uint_arg(pargs);
id_set_value(pcs->macro_id, id);
pcs->macro_id_type = numeric_id;
return 0;
}
/* Initialization */
private int
pcmacros_do_init(gs_memory_t *mem)
{ /* Register commands */
DEFINE_CLASS('&')
{'f', 'X',
PCL_COMMAND("Macro Control", pcl_macro_control,
pca_neg_error|pca_big_error|pca_in_macro)},
{'f', 'Y',
PCL_COMMAND("Assign Macro ID", pcl_assign_macro_id,
pca_neg_error|pca_big_error)},
END_CLASS
return 0;
}
private void
pcmacros_do_reset(pcl_state_t *pcs, pcl_reset_type_t type)
{ if ( type & (pcl_reset_initial | pcl_reset_printer) )
{ pcs->overlay_enabled = false;
pcs->macro_level = 0;
pcs->defining_macro = false;
pcs->saved = 0;
pcs->macro_definition = 0;
if ( type & pcl_reset_initial )
pl_dict_init(&pcs->macros, pcs->memory, NULL);
else
{ pcl_args_t args;
arg_set_uint(&args, macro_delete_temporary);
pcl_macro_control(&args, pcs);
if ( pcs->alpha_macro_id.id != 0 )
gs_free_object(pcs->memory,
pcs->alpha_macro_id.id,
"pcmacros_do_reset");
}
}
if ( type & (pcl_reset_initial | pcl_reset_printer | pcl_reset_overlay) )
{
pcs->alpha_macro_id.size = 0;
pcs->macro_id_type = numeric_id;
id_set_value(pcs->macro_id, 0);
pcs->alpha_macro_id.id = 0;
}
}
private int
pcmacros_do_copy(pcl_state_t *psaved, const pcl_state_t *pcs,
pcl_copy_operation_t operation)
{ if ( operation & pcl_copy_after )
{ /* Don't restore the macro dictionary. */
psaved->macros = pcs->macros;
}
return 0;
}
const pcl_init_t pcmacros_init = {
pcmacros_do_init, pcmacros_do_reset, pcmacros_do_copy
};
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