/usr/share/doc/flex/examples/manual/front.y is in flex 2.6.4-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | /* C code supplied at the beginning of the file. */
%{
#include <stdio.h>
#include <string.h>
extern int yylexlinenum; /* these are in YYlex */
extern char *yytext; /* current token */
%}
/* Keywords and reserved words begin here. */
%union{ /* this is the data union */
char name[128]; /* names */
}
/*-------------------- the reserved words -----------------------------*/
%token PERIOD
%token NEWLINE
%token POSITIONAL
%token VERB
%token ADVERB
%token PROPER_NOUN
%token NOUN
%token DECLARATIVE
%token CONDITIONAL
%type <name> declarative
%type <name> verb_phrase
%type <name> noun_phrase
%type <name> position_phrase
%type <name> adverb
%type <name> POSITIONAL VERB ADVERB PROPER_NOUN
%type <name> NOUN DECLARATIVE CONDITIONAL
%%
sentence_list : sentence
| sentence_list NEWLINE sentence
;
sentence : verb_phrase noun_phrase position_phrase adverb period
{
printf("I understand that sentence.\n");
printf("VP = %s \n",$1);
printf("NP = %s \n",$2);
printf("PP = %s \n",$3);
printf("AD = %s \n",$4);
}
| { yyerror("That's a strange sentence !!"); }
;
position_phrase : POSITIONAL declarative PROPER_NOUN
{
sprintf($$,"%s %s %s",$1,$2,$3);
}
| /* empty */ { strcpy($$,""); }
;
verb_phrase : VERB { strcpy($$,$1); strcat($$," "); }
| adverb VERB
{
sprintf($$,"%s %s",$1,$2);
}
;
adverb : ADVERB { strcpy($$,$1); }
| /* empty */ { strcpy($$,""); }
;
noun_phrase : DECLARATIVE NOUN
{
sprintf($$,"%s %s",$1,$2);
}
| CONDITIONAL declarative NOUN
{
sprintf($$,"%s %s %s",$1,$2,$3);
}
| NOUN { strcpy($$,$1); strcat($$," "); }
;
declarative : DECLARATIVE { strcpy($$,$1); }
| /* empty */ { strcpy($$,""); }
;
period : /* empty */
| PERIOD
;
%%
/* Supplied main() and yyerror() functions. */
int main(int argc, char *argv[])
{
yyparse(); /* parse the file */
return(0);
}
int yyerror(char *message)
{
extern FILE *yyout;
fprintf(yyout,"\nError at line %5d. (%s) \n",
yylexlinenum,message);
}
|