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/*
* zle_params.c - ZLE special parameters
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1992-1997 Paul Falstad
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Paul Falstad or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Paul Falstad and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "zle.mdh"
#include "zle_params.pro"
/*
* ZLE SPECIAL PARAMETERS:
*
* These special parameters are created, with a local scope, when
* running user-defined widget functions. Reading and writing them
* reads and writes bits of ZLE state. The parameters are:
*
* BUFFER (scalar) entire buffer contents
* CURSOR (integer) cursor position; 0 <= $CURSOR <= $#BUFFER
* LBUFFER (scalar) portion of buffer to the left of the cursor
* RBUFFER (scalar) portion of buffer to the right of the cursor
*/
#define FN(X) ( (void (*) _((void))) (X) )
static struct zleparam {
char *name;
int type;
void (*setfn) _((void));
void (*getfn) _((void));
void (*unsetfn) _((Param, int));
void *data;
} zleparams[] = {
{ "BUFFER", PM_SCALAR, FN(set_buffer), FN(get_buffer),
zleunsetfn, NULL },
{ "CURSOR", PM_INTEGER, FN(set_cursor), FN(get_cursor),
zleunsetfn, NULL },
{ "LBUFFER", PM_SCALAR, FN(set_lbuffer), FN(get_lbuffer),
zleunsetfn, NULL },
{ "RBUFFER", PM_SCALAR, FN(set_rbuffer), FN(get_rbuffer),
zleunsetfn, NULL },
{ "WIDGET", PM_SCALAR | PM_READONLY, NULL, FN(get_widget),
zleunsetfn, NULL },
{ "LASTWIDGET", PM_SCALAR | PM_READONLY, NULL, FN(get_lwidget),
zleunsetfn, NULL },
{ NULL, 0, NULL, NULL, NULL, NULL }
};
/**/
void
makezleparams(int ro)
{
struct zleparam *zp;
for(zp = zleparams; zp->name; zp++) {
Param pm = createparam(zp->name, (zp->type |PM_SPECIAL|PM_REMOVABLE|
(ro ? PM_READONLY : 0)));
if (!pm)
pm = (Param) paramtab->getnode(paramtab, zp->name);
DPUTS(!pm, "param not set in makezleparams");
pm->level = locallevel;
pm->u.data = zp->data;
switch(PM_TYPE(zp->type)) {
case PM_SCALAR:
pm->sets.cfn = (void (*) _((Param, char *))) zp->setfn;
pm->gets.cfn = (char *(*) _((Param))) zp->getfn;
break;
case PM_ARRAY:
pm->sets.afn = (void (*) _((Param, char **))) zp->setfn;
pm->gets.afn = (char **(*) _((Param))) zp->getfn;
break;
case PM_INTEGER:
pm->sets.ifn = (void (*) _((Param, long))) zp->setfn;
pm->gets.ifn = (long (*) _((Param))) zp->getfn;
break;
}
pm->unsetfn = zp->unsetfn;
}
}
/* Special unset function for ZLE special parameters: act like the standard *
* unset function if this is a user-initiated unset, but nothing is done if *
* the parameter is merely going out of scope (which it will do). */
/**/
static void
zleunsetfn(Param pm, int exp)
{
if(exp)
stdunsetfn(pm, exp);
}
/**/
static void
set_buffer(Param pm, char *x)
{
if(x) {
unmetafy(x, &ll);
sizeline(ll);
strcpy((char *)line, x);
zsfree(x);
if(cs > ll)
cs = ll;
} else
cs = ll = 0;
}
/**/
static char *
get_buffer(Param pm)
{
return metafy((char *)line, ll, META_HEAPDUP);
}
/**/
static void
set_cursor(Param pm, long x)
{
if(x < 0)
cs = 0;
else if(x > ll)
cs = ll;
else
cs = x;
}
/**/
static long
get_cursor(Param pm)
{
return cs;
}
/**/
static void
set_lbuffer(Param pm, char *x)
{
char *y;
int len;
if(x)
unmetafy(y = x, &len);
else
y = "", len = 0;
sizeline(ll - cs + len);
memmove(line + len, line + cs, ll - cs);
memcpy(line, y, len);
ll = ll - cs + len;
cs = len;
zsfree(x);
}
/**/
static char *
get_lbuffer(Param pm)
{
return metafy((char *)line, cs, META_HEAPDUP);
}
/**/
static void
set_rbuffer(Param pm, char *x)
{
char *y;
int len;
if(x)
unmetafy(y = x, &len);
else
y = "", len = 0;
sizeline(ll = cs + len);
memcpy(line + cs, y, len);
zsfree(x);
}
/**/
static char *
get_rbuffer(Param pm)
{
return metafy((char *)line + cs, ll - cs, META_HEAPDUP);
}
/**/
static char *
get_widget(Param pm)
{
return bindk->nam;
}
/**/
static char *
get_lwidget(Param pm)
{
return (lbindk ? lbindk->nam : "");
}
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