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/*
* Copyright (C) 2021 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2021 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-plugin-fw
* Created on: 4 сент. 2021 г.
*
* lsp-plugin-fw is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-plugin-fw is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-plugin-fw. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_PLUG_FW_UI_UIOVERRIDES_H_
#define LSP_PLUG_IN_PLUG_FW_UI_UIOVERRIDES_H_
#ifndef LSP_PLUG_IN_PLUG_FW_UI_IMPL_H_
#error "Use #include <lsp-plug.in/plug-fw/ui/ui.h>"
#endif /* LSP_PLUG_IN_PLUG_FW_UI_IMPL_H_ */
#include <lsp-plug.in/plug-fw/version.h>
#include <lsp-plug.in/lltl/parray.h>
#include <lsp-plug.in/runtime/LSPString.h>
namespace lsp
{
namespace ui
{
/**
* Attribute overrides (key=value pairs)
*/
class UIOverrides
{
protected:
typedef struct attribute_t
{
LSPString name; // Name of attribute
LSPString value; // Associated value
ssize_t refs; // Number of references
ssize_t depth; // The actual attribute depth
ssize_t vdepth; // Visibilty depth
} attribute_t;
// Attribute list to override
typedef struct attlist_t
{
lltl::parray<attribute_t> items;
size_t depth;
} attlist_t;
protected:
lltl::parray<attlist_t> vStack;
protected:
static void drop_attlist(attlist_t *list);
static bool attribute_present(const LSPString * const *atts, const LSPString *name);
static void release_attribute(attribute_t *attr, size_t depth);
public:
explicit UIOverrides();
~UIOverrides();
public:
/**
* Create new state of overrides increasing depth
* @param depth depth increment
* @return status of operation
*/
status_t push(size_t depth);
/**
* Destroy the top state of overrides decreasing depth
* @return status of operation
*/
status_t pop();
/**
* Set new attribute (or replace previously existing)
* @param name attribute name
* @param value attribute value
* @param depth depth of the attribute
* @return status of operation
*/
status_t set(const LSPString *name, const LSPString *value, ssize_t depth);
/**
* Get attribute value by name
* @param name attribute name
* @return attribute value
*/
const LSPString *get(const LSPString *name) const;
/**
* Get attribute name by index
* @param index attribute index
* @return attribute name or NULL
*/
const LSPString *name(size_t index) const;
/**
* Get attribute value by index
* @param index attribute index
* @return attribute value or NULL
*/
const LSPString *value(size_t index) const;
/**
* Get number of attributes
* @return number of attributes
*/
size_t count() const;
/**
* Build list with overridden attributes
* @param dst destination list to store all attributes with NULL-terminating element
* @param atts source NULL-terminated list of key=value pairs
* @return status of operation
*/
status_t build(lltl::parray<LSPString> *dst, const LSPString * const *atts);
};
}
}
#endif /* LSP_PLUG_IN_PLUG_FW_UI_UIOVERRIDES_H_ */
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