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  1. /*
  2.  * Copyright (c) 2009 Jiri Svoboda
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup kbdgen generic
  30.  * @brief   Generic scancode parser.
  31.  * @ingroup  kbd
  32.  * @{
  33.  */
  34. /** @file
  35.  */
  36.  
  37. #ifndef KBD_GSP_H_
  38. #define KBD_GSP_H_
  39.  
  40. #include <libadt/hash_table.h>
  41.  
  42. enum {
  43.     GSP_END     = -1,   /**< Terminates a sequence. */
  44.     GSP_DEFAULT = -2    /**< Wildcard, catches unhandled cases. */
  45. };
  46.  
  47. /** Scancode parser description */
  48. typedef struct {
  49.     /** Transition table, (state, input) -> (state, output) */
  50.     hash_table_t trans;
  51.  
  52.     /** Number of states */
  53.     int states;
  54. } gsp_t;
  55.  
  56. /** Scancode parser transition. */
  57. typedef struct {
  58.     link_t link;        /**< Link to hash table in @c gsp_t */
  59.  
  60.     /* Preconditions */
  61.  
  62.     int old_state;      /**< State before transition */
  63.     int input;      /**< Input symbol (scancode) */
  64.  
  65.     /* Effects */
  66.  
  67.     int new_state;      /**< State after transition */
  68.  
  69.     /* Output emitted during transition */
  70.  
  71.     unsigned out_mods;  /**< Modifier to emit */
  72.     unsigned out_key;   /**< Keycode to emit */
  73. } gsp_trans_t;
  74.  
  75. extern void gsp_init(gsp_t *);
  76. extern int gsp_insert_defs(gsp_t *, const int *);
  77. extern int gsp_insert_seq(gsp_t *, const int *, unsigned, unsigned);
  78. extern int gsp_step(gsp_t *, int, int, unsigned *, unsigned *);
  79.  
  80. #endif
  81.  
  82. /**
  83.  * @}
  84.  */
  85.