lib/command_lex.l

   1 /*
   2  * Command format string lexer for CLI backend.
   3  *
   4  * --
   5  * Copyright (C) 2015 Cumulus Networks, Inc.
   6  *
   7  * This file is part of GNU Zebra.
   8  *
   9  * GNU Zebra is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2, or (at your option) any
  12  * later version.
  13  *
  14  * GNU Zebra is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  21  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  22  * 02111-1307, USA.
  23  */
  24
  25 %{
  26 /* ignore harmless bug in old versions of flex */
  27 #pragma GCC diagnostic ignored "-Wsign-compare"
  28
  29 #include "command_parse.h"
  30
  31 #define YY_USER_ACTION yylloc->last_column += yyleng;
  32 #define LOC_STEP do { if (yylloc) { \
  33         yylloc->first_column = yylloc->last_column; \
  34         yylloc->first_line = yylloc->last_line; \
  35         } } while(0)
  36 %}
  37
  38 WORD            (\-|\+)?[a-z0-9\*][-+_a-zA-Z0-9\*]*
  39 IPV4            A\.B\.C\.D
  40 IPV4_PREFIX     A\.B\.C\.D\/M
  41 IPV6            X:X::X:X
  42 IPV6_PREFIX     X:X::X:X\/M
  43 VARIABLE        [A-Z][-_a-zA-Z:0-9]+
  44 NUMBER          (\-|\+)?[0-9]{1,20}
  45 RANGE           \({NUMBER}[ ]?\-[ ]?{NUMBER}\)
  46
  47 /* yytext shall be a pointer */
  48 %pointer
  49 %option noyywrap
  50 %option nounput
  51 %option noinput
  52 %option outfile="command_lex.c"
  53 %option header-file="command_lex.h"
  54 %option prefix="cmd_yy"
  55 %option reentrant
  56 %option bison-bridge
  57 %option bison-locations
  58
  59 %%
  60 %{
  61                 LOC_STEP;
  62 %}
  63
  64 [ \t]+          LOC_STEP /* ignore whitespace */;
  65 {WORD}          {yylval->string = XSTRDUP(MTYPE_LEX, yytext); return WORD;}
  66 {IPV4}          {yylval->string = XSTRDUP(MTYPE_LEX, yytext); return IPV4;}
  67 {IPV4_PREFIX}   {yylval->string = XSTRDUP(MTYPE_LEX, yytext); return IPV4_PREFIX;}
  68 {IPV6}          {yylval->string = XSTRDUP(MTYPE_LEX, yytext); return IPV6;}
  69 {IPV6_PREFIX}   {yylval->string = XSTRDUP(MTYPE_LEX, yytext); return IPV6_PREFIX;}
  70 {VARIABLE}      {yylval->string = XSTRDUP(MTYPE_LEX, yytext); return VARIABLE;}
  71 {RANGE}         {yylval->string = XSTRDUP(MTYPE_LEX, yytext); return RANGE;}
  72 .               {return yytext[0];}
  73 %%
  74
  75 YY_BUFFER_STATE buffer;
  76
  77 void set_lexer_string (yyscan_t *scn, const char *string)
  78 {
  79   *scn = NULL;
  80   yylex_init(scn);
  81   buffer = yy_scan_string (string, *scn);
  82 }
  83
  84 void cleanup_lexer (yyscan_t *scn)
  85 {
  86   // yy_delete_buffer (buffer, *scn);
  87   yylex_destroy(*scn);
  88 }