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4377 svoboda 1
/*
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 * Copyright (c) 2009 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup kbdgen generic
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 * @brief   Generic scancode parser.
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 * @ingroup  kbd
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 * @{
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 */
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/** @file
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 */
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#ifndef KBD_GSP_H_
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#define KBD_GSP_H_
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#include <libadt/hash_table.h>
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enum {
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    GSP_END     = -1,   /**< Terminates a sequence. */
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    GSP_DEFAULT = -2    /**< Wildcard, catches unhandled cases. */
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};
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/** Scancode parser description */
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typedef struct {
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    /** Transition table, (state, input) -> (state, output) */
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    hash_table_t trans;
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    /** Number of states */
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    int states;
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} gsp_t;
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/** Scancode parser transition. */
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typedef struct {
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    link_t link;        /**< Link to hash table in @c gsp_t */
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    /* Preconditions */
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    int old_state;      /**< State before transition */
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    int input;      /**< Input symbol (scancode) */
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    /* Effects */
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    int new_state;      /**< State after transition */
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    /* Output emitted during transition */
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    unsigned out_mods;  /**< Modifier to emit */
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    unsigned out_key;   /**< Keycode to emit */
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} gsp_trans_t;
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extern void gsp_init(gsp_t *);
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extern int gsp_insert_defs(gsp_t *, const int *);
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extern int gsp_insert_seq(gsp_t *, const int *, unsigned, unsigned);
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extern int gsp_step(gsp_t *, int, int, unsigned *, unsigned *);
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#endif
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/**
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 * @}
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 */