Dogcows Code - chaz/openbox/blob - obcl/parse.y

   1 %{
   2 #include "obcl.h"
   3
   4 int yylex(void);
   5 void yyerror(char *msg, ...);
   6
   7 extern int yylineno;
   8 extern char *yytext;
   9 GList *config; /* this is what we parse into */
  10
  11 %}
  12
  13 %union {
  14     double num;
  15     gchar *string;
  16     CLNode *node;
  17     GList *glist;
  18 };
  19
  20 %token <num> TOK_NUM
  21 %token <string> TOK_ID TOK_STRING
  22 %token TOK_SEP
  23
  24 %type <glist> config
  25 %type <glist> stmts
  26 %type <node> stmt
  27 %type <glist> list
  28 %type <glist> block
  29 %type <node> value
  30
  31 %expect 2 /* for now */
  32
  33 %%
  34
  35 config: stmts
  36     {
  37         config = $$ = $1;
  38     }
  39     ;
  40
  41 stmts:
  42     { $$ = NULL; }
  43     | stmt
  44     { $$ = g_list_append(NULL, $1); }
  45     | stmts stmt
  46     { $$ = g_list_append($1, $2); }
  47     ;
  48
  49 stmt: TOK_ID list ';'
  50     {
  51         CLNode *s = g_new(CLNode,1);
  52         s->type = CL_LIST;
  53         s->u.lb.list = $2;
  54         s->u.lb.block = NULL;
  55         s->u.lb.id = $1;
  56         s->lineno = yylineno;
  57         $$ = s;
  58     }
  59     | TOK_ID list block
  60     {
  61         CLNode *s = g_new(CLNode,1);
  62         s->type = CL_LISTBLOCK;
  63         s->u.lb.list = $2;
  64         s->u.lb.block = $3;
  65         s->u.lb.id = $1;
  66         s->lineno = yylineno;
  67         $$ = s;
  68     }
  69     | TOK_ID block
  70     {
  71         CLNode *s = g_new(CLNode,1);
  72         s->type = CL_BLOCK;
  73         s->u.lb.block = $2;
  74         s->u.lb.list = NULL;
  75         s->u.lb.id = $1;
  76         s->lineno = yylineno;
  77         $$ = s;
  78     }
  79     ;
  80
  81 list: value
  82     {
  83         $$ = g_list_append(NULL, $1);
  84     }
  85     | list ',' value
  86     {
  87         $$ = g_list_append($1, $3);
  88     }
  89     ;
  90
  91 block: '{' stmts '}'
  92     {
  93         $$ = $2;
  94     }
  95     ;
  96
  97 value: TOK_ID
  98     {
  99         CLNode *node = g_new(CLNode,1);
 100         node->type = CL_ID;
 101         node->u.str = $1;
 102         node->lineno = yylineno;
 103         $$ = node;
 104     }
 105     | TOK_STRING
 106     {
 107         CLNode *node = g_new(CLNode,1);
 108         node->type = CL_STR;
 109         node->u.str = $1;
 110         node->lineno = yylineno;
 111         $$ = node;
 112     }
 113     | TOK_NUM
 114     {
 115         CLNode *node = g_new(CLNode,1);
 116         node->type = CL_NUM;
 117         node->u.num = $1;
 118         node->lineno = yylineno;
 119         $$ = node;
 120     }
 121     ;
 122
 123 %%
 124
 125 int yywrap()
 126 {
 127     return 1;
 128 }
 129
 130 /* void yyerror(const char *err) */
 131 /* { */
 132 /*     fprintf(stderr, "Parse error on line %d, near '%s': %s\n", */
 133 /*             yylineno, yytext, err); */
 134 /* } */
 135
 136 void yyerror(char *msg, ...)
 137 {
 138     va_list args;
 139     va_start(args,msg);
 140
 141     fprintf(stderr, "Error on line %d, near '%s': ", yylineno, yytext);
 142     vfprintf(stderr, msg, args);
 143     fprintf(stderr,"\n");
 144
 145     va_end(args);
 146 }
 147
 148 GList *cl_parse_fh(FILE *fh)
 149 {
 150     extern FILE *yyin;
 151     yyin = fh;
 152     yyparse();
 153     return config;
 154 }