/*
* Copyright (C) 2018 Richard Hughes <richard@hughsie.com>
*
* SPDX-License-Identifier: LGPL-2.1+
*/
#define G_LOG_DOMAIN "XbMachine"
#include "config.h"
#include <gio/gio.h>
#include "xb-opcode-private.h"
#include "xb-stack-private.h"
struct _XbStack {
gint ref;
guint pos;
guint max_size;
XbOpcode *opcodes[]; /* allocated as part of XbStack */
};
/**
* xb_stack_unref:
* @self: a #XbStack
*
* Decrements the reference count of the stack, freeing the object when the
* refcount drops to zero.
*
* Since: 0.1.3
**/
void
xb_stack_unref (XbStack *self)
{
g_assert (self->ref > 0);
if (--self->ref > 0)
return;
for (guint i = 0; i < self->pos; i++)
xb_opcode_unref (self->opcodes[i]);
g_free (self);
}
/**
* xb_stack_ref:
* @self: a #XbStack
*
* Increments the refcount of the stack.
*
* Returns: (transfer none): the original @self #XbStack instance
*
* Since: 0.1.3
**/
XbStack *
xb_stack_ref (XbStack *self)
{
self->ref++;
return self;
}
/**
* xb_stack_pop:
* @self: a #XbStack
*
* Pops an opcode off the stack.
*
* Returns: (transfer full): a #XbOpcode
*
* Since: 0.1.3
**/
XbOpcode *
xb_stack_pop (XbStack *self)
{
if (self->pos == 0)
return NULL;
return self->opcodes[--self->pos];
}
/* private */
GPtrArray *
xb_stack_steal_all (XbStack *self)
{
GPtrArray *array;
/* array takes ownership of the opcodes */
array = g_ptr_array_new_with_free_func ((GDestroyNotify) xb_opcode_unref);
for (guint i = 0; i < self->pos; i++)
g_ptr_array_add (array, self->opcodes[i]);
self->pos = 0;
return array;
}
/**
* xb_stack_peek:
* @self: a #XbStack
* @idx: index
*
* Peeks an opcode from the stack.
*
* Returns: (transfer none): a #XbOpcode
*
* Since: 0.1.3
**/
XbOpcode *
xb_stack_peek (XbStack *self, guint idx)
{
if (idx >= self->pos)
return NULL;
return self->opcodes[idx];
}
/* private */
gboolean
xb_stack_push_bool (XbStack *self, gboolean val)
{
return xb_stack_push_steal (self, xb_opcode_bool_new (val));
}
/* private */
XbOpcode *
xb_stack_peek_head (XbStack *self)
{
if (self->pos == 0)
return NULL;
return self->opcodes[0];
}
/* private */
XbOpcode *
xb_stack_peek_tail (XbStack *self)
{
if (self->pos == 0)
return NULL;
return self->opcodes[self->pos - 1];
}
/**
* xb_stack_push:
* @self: a #XbStack
* @opcode: a #XbOpcode
*
* Pushes a new opcode onto the end of the stack
*
* Returns: %TRUE if the opcode was stored on the stack
*
* Since: 0.1.3
**/
gboolean
xb_stack_push (XbStack *self, XbOpcode *opcode)
{
if (self->pos >= self->max_size)
return FALSE;
self->opcodes[self->pos++] = xb_opcode_ref (opcode);
return TRUE;
}
/**
* xb_stack_push_steal:
* @self: a #XbStack
* @opcode: a #XbOpcode, which is consumed
*
* Pushes a new opcode onto the end of the stack
*
* Returns: %TRUE if the opcode was stored on the stack
*
* Since: 0.1.3
**/
gboolean
xb_stack_push_steal (XbStack *self, XbOpcode *opcode)
{
if (self->pos >= self->max_size)
return FALSE;
self->opcodes[self->pos++] = opcode;
return TRUE;
}
/**
* xb_stack_get_size:
* @self: a #XbStack
*
* Gets the current size of the stack.
*
* Returns: integer, where 0 is "empty"
*
* Since: 0.1.3
**/
guint
xb_stack_get_size (XbStack *self)
{
return self->pos;
}
/**
* xb_stack_get_max_size:
* @self: a #XbStack
*
* Gets the maximum size of the stack.
*
* Returns: integer
*
* Since: 0.1.3
**/
guint
xb_stack_get_max_size (XbStack *self)
{
return self->max_size;
}
/**
* xb_stack_to_string:
* @self: a #XbStack
*
* Returns a string representing a stack.
*
* Returns: text
*
* Since: 0.1.4
**/
gchar *
xb_stack_to_string (XbStack *self)
{
GString *str = g_string_new (NULL);
for (guint i = 0; i < self->pos; i++) {
g_autofree gchar *tmp = xb_opcode_to_string (self->opcodes[i]);
g_string_append_printf (str, "%s,", tmp);
}
if (str->len > 0)
g_string_truncate (str, str->len - 1);
return g_string_free (str, FALSE);
}
/**
* xb_stack_new:
* @max_size: maximum size of the stack
*
* Creates a stack for the XbMachine request. Only #XbOpcode's can be pushed and
* popped from the stack.
*
* Returns: (transfer full): a #XbStack
*
* Since: 0.1.3
**/
XbStack *
xb_stack_new (guint max_size)
{
XbStack *self = g_malloc0 (sizeof(XbStack) + max_size * sizeof(XbOpcode*));
self->ref = 1;
self->max_size = max_size;
return self;
}
GType
xb_stack_get_type (void)
{
static GType type = 0;
if (G_UNLIKELY (!type)) {
type = g_boxed_type_register_static ("XbStack",
(GBoxedCopyFunc) xb_stack_ref,
(GBoxedFreeFunc) xb_stack_unref);
}
return type;
}