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/*
* context.c - context save and restore
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 2015 Peter Stephenson
* 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 Peter Stephenson 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 Peter Stephenson and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Peter Stephenson 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 Peter Stephenson and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
/*
* This short file provides a home for the stack of saved contexts.
* The actions for saving and restoring are encapsulated within
* individual modules.
*/
#include "zsh.mdh"
#include "context.pro"
struct context_stack {
struct context_stack *next;
struct hist_stack hist_stack;
struct lex_stack lex_stack;
struct parse_stack parse_stack;
};
static struct context_stack *cstack;
/* save some or all of current context */
/**/
mod_export void
zcontext_save_partial(int parts)
{
struct context_stack *cs;
cs = (struct context_stack *)malloc(sizeof(struct context_stack));
if (parts & ZCONTEXT_HIST) {
hist_context_save(&cs->hist_stack, !cstack);
}
if (parts & ZCONTEXT_LEX) {
lex_context_save(&cs->lex_stack, !cstack);
}
if (parts & ZCONTEXT_PARSE) {
parse_context_save(&cs->parse_stack, !cstack);
}
cs->next = cstack;
cstack = cs;
}
/* save context in full */
/**/
mod_export void
zcontext_save(void)
{
zcontext_save_partial(ZCONTEXT_HIST|ZCONTEXT_LEX|ZCONTEXT_PARSE);
}
/* restore context or part thereof */
/**/
mod_export void
zcontext_restore_partial(int parts)
{
struct context_stack *cs = cstack;
DPUTS(!cstack, "BUG: zcontext_restore() without zcontext_save()");
queue_signals();
cstack = cstack->next;
if (parts & ZCONTEXT_HIST) {
hist_context_restore(&cs->hist_stack, !cstack);
}
if (parts & ZCONTEXT_LEX) {
lex_context_restore(&cs->lex_stack, !cstack);
}
if (parts & ZCONTEXT_PARSE) {
parse_context_restore(&cs->parse_stack, !cstack);
}
free(cs);
unqueue_signals();
}
/* restore full context */
/**/
mod_export void
zcontext_restore(void)
{
zcontext_restore_partial(ZCONTEXT_HIST|ZCONTEXT_LEX|ZCONTEXT_PARSE);
}
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