mdw@git.distorted.org.uk Git - secnet/blob - conffile.y

   1 %token TOK_STRING
   2 %token TOK_NUMBER
   3 %token TOK_KEY
   4
   5 %start input
   6
   7 %{
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include "secnet.h"
  12 #include "conffile_internal.h"
  13 #include "conffile.yy.h"
  14 #include "util.h"
  15 #define YYERROR_VERBOSE
  16
  17 static struct p_node *node(uint32_t type, struct p_node *l, struct p_node *r);
  18
  19 static struct p_node *result;
  20
  21 static void yyerror(const char *s);
  22
  23 %}
  24
  25 %%
  26
  27 input:            assignments { result = $1; $$=result; }
  28                 ;
  29
  30 assignments:      assignments assignment { $$=node(T_ALIST, $2, $1); }
  31                 | assignment { $$=node(T_ALIST, $1, NULL); }
  32                 ;
  33
  34 searchpath:       /* empty */ { $$ = NULL; }
  35                 | '<' list '>' { $$ = $2; }
  36                 ;
  37
  38 dict:             searchpath '{' assignments '}'
  39         { $$ = node(T_DICT, $3, $1); }
  40                 | searchpath '{' '}' { $$ = node(T_DICT, NULL, $1); }
  41                 ;
  42
  43 path:             '/' pathelements { $$ = node(T_ABSPATH, NULL, $2); }
  44                 | pathelements { $$ = node(T_RELPATH, NULL, $1); }
  45                 ;
  46
  47 pathelements:     pathelements '/' TOK_KEY { $$ = node(T_PATHELEM, $3, $1); }
  48                 | TOK_KEY { $$ = node(T_PATHELEM, $1, NULL); }
  49                 ;
  50
  51 exec:             item '(' list ')' { $$ = node(T_EXEC, $1, $3); }
  52                 | item '(' ')' { $$ = node(T_EXEC, $1, NULL); }
  53                 | item dict
  54         { $$ = node(T_EXEC, $1, node(T_LISTITEM, $2, NULL)); }
  55                 ;
  56
  57 list:             list ',' item { $$ = node(T_LISTITEM, $3, $1); }
  58                 | item { $$ = node(T_LISTITEM, $1, NULL); }
  59                 ;
  60
  61 assignment:       TOK_KEY '=' list ';' { $$ = node(T_ASSIGNMENT, $1, $3); }
  62                 | TOK_KEY list ';' { $$ = node(T_ASSIGNMENT, $1, $2); }
  63                 | error ';' { $$ = node(T_ERROR, NULL, NULL); }
  64                 | error '}' { $$ = node(T_ERROR, NULL, NULL); }
  65                 | error ')' { $$ = node(T_ERROR, NULL, NULL); }
  66                 ;
  67
  68 item:             TOK_STRING
  69                 | TOK_NUMBER
  70                 | path
  71                 | dict
  72                 | exec
  73                 ;
  74
  75 %%
  76
  77 static void yyerror(const char *s)
  78 {
  79         Message(M_FATAL,"config file %s line %d: %s\n",config_file,
  80                 config_lineno,s);
  81 }
  82
  83 struct p_node *parse_conffile(FILE *conffile)
  84 {
  85         yyin=conffile;
  86         if (yyparse()!=0) {
  87                 fatal("Configuration file parsing failed\n");
  88         }
  89         if (yynerrs>0) {
  90                 fatal("%d error%s encountered in configuration file\n",
  91                 yynerrs,yynerrs==1?"":"s");
  92         }
  93         return result;
  94 }
  95
  96 static struct p_node *node(uint32_t type, struct p_node *l, struct p_node *r)
  97 {
  98         struct p_node *rv;
  99
 100         rv=safe_malloc(sizeof(*rv),"p_node");
 101         rv->type=type;
 102         rv->loc.file=config_file;
 103         rv->loc.line=config_lineno;
 104         rv->l=l;
 105         rv->r=r;
 106         return rv;
 107 }