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      1 /* $NetBSD: config_yacc.y,v 1.4 2008/07/17 16:24:56 drochner Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Julio M. Merino Vidal.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. The name authors may not be used to endorse or promote products
     16  *    derived from this software without specific prior written
     17  *    permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
     20  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
     23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     25  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 %{
     33 
     34 #include <sys/cdefs.h>
     35 
     36 #ifndef lint
     37 __RCSID("$NetBSD: config_yacc.y,v 1.4 2008/07/17 16:24:56 drochner Exp $");
     38 #endif /* not lint */
     39 
     40 #include <sys/time.h>
     41 #include <dev/wscons/wsconsio.h>
     42 #include <err.h>
     43 #include <errno.h>
     44 #include <stdio.h>
     45 #include <stdarg.h>
     46 #include <string.h>
     47 #include <stdlib.h>
     48 
     49 #include "wsmoused.h"
     50 
     51 int yylex(void);
     52 int yyparse(void);
     53 int yyerror(const char *, ...);
     54 void yyrestart(FILE *);
     55 struct block *config_parse(FILE *);
     56 
     57 int yyline;
     58 static struct block *Conf;
     59 
     60 %}
     61 
     62 %token TK_EOL
     63 %token TK_EQUAL TK_LBRACE TK_RBRACE
     64 %token TK_STRING TK_MODE TK_MODEPROP
     65 %type <string> TK_STRING TK_MODEPROP
     66 %type <prop> modeprop
     67 %type <block> main outermode mode
     68 %union {
     69 	char *string;
     70 	struct prop *prop;
     71 	struct block *block;
     72 }
     73 
     74 %%
     75 
     76 Config :
     77 	  main			{ Conf = $1;
     78 				  Conf->b_name = strdup("global"); }
     79 ;
     80 
     81 /* Matches the whole configuration file and constructs a block defining it.
     82    Can contain mode properties (common to all modes) and mode definitions. */
     83 main :
     84 	  modeprop		{ struct block *b = block_new(BLOCK_GLOBAL);
     85 				  block_add_prop(b, $1);
     86 				  $$ = b; }
     87 	| main modeprop		{ block_add_prop($1, $2); }
     88 	| outermode		{ struct block *b = block_new(BLOCK_GLOBAL);
     89 				  block_add_child(b, $1);
     90 				  $$ = b; }
     91 	| main outermode	{ block_add_child($1, $2); }
     92 	| error TK_EOL		{ yyerrok; }
     93 ;
     94 
     95 /* Defines the aspect of a mode definition.  Returns the block given by the
     96    mode definition itself. */
     97 outermode :
     98 	  TK_MODE TK_STRING TK_LBRACE mode TK_RBRACE
     99 				{ $4->b_name = strdup($2);
    100 				  $$ = $4; }
    101 	| TK_MODE TK_STRING TK_LBRACE TK_RBRACE
    102 				{ $$ = block_new(BLOCK_MODE);
    103 				  $$->b_name = strdup($2); }
    104 ;
    105 
    106 /* Matches a mode and returns a block defining it.  Contains properties */
    107 mode :
    108 	  modeprop		{ struct block *b = block_new(BLOCK_MODE);
    109 				  block_add_prop(b, $1);
    110 				  $$ = b; }
    111 	| mode modeprop		{ block_add_prop($1, $2); }
    112 	| error TK_EOL		{ yyerrok; }
    113 ;
    114 
    115 /* Matches a mode property and returns a prop defining it. */
    116 modeprop :
    117 	TK_MODEPROP TK_EQUAL TK_STRING TK_EOL
    118 				{ struct prop *p = prop_new();
    119 				  p->p_name = strdup($1);
    120 				  p->p_value = strdup($3);
    121 				  $$ = p; }
    122 ;
    123 
    124 %%
    125 
    126 int
    127 yyerror(const char *fmt, ...)
    128 {
    129 	va_list ap;
    130 
    131 	va_start(ap, fmt);
    132 	fprintf(stderr, "%s: ", getprogname());
    133 	vfprintf(stderr, fmt, ap);
    134 	fprintf(stderr, " in line %d\n", yyline);
    135 	va_end(ap);
    136 	return (0);
    137 }
    138 
    139 struct block *
    140 config_parse(FILE *f)
    141 {
    142 	Conf = NULL;
    143 	yyrestart(f);
    144 	yyline = 1;
    145 	yyparse();
    146 
    147 	return Conf;
    148 }
    149