%{
#include <stdio.h>
void yyerror(char *s);
extern int yylex(void);
%}

%token H1_OPEN H1_CLOSE H2_OPEN H2_CLOSE
%token P_OPEN P_CLOSE B_OPEN B_CLOSE BR
%token A_OPEN A_CLOSE IMG_OPEN TAG_CLOSE SELF_CLOSE
%token HREF SRC ALT WIDTH HEIGHT QUOTE TEXT

%%
document:
    | document element
    ;

element:
      H1_OPEN content H1_CLOSE
    | H2_OPEN content H2_CLOSE
    | P_OPEN content P_CLOSE
    | B_OPEN content B_CLOSE
    | BR
    | A_OPEN link_attributes TAG_CLOSE content A_CLOSE
    | IMG_OPEN img_attributes SELF_CLOSE
    ;

content:
      TEXT
    | content element
    ;

link_attributes:
      HREF TEXT QUOTE
    ;

img_attributes:
      SRC TEXT QUOTE ALT TEXT QUOTE WIDTH TEXT QUOTE HEIGHT TEXT QUOTE
    ;

%%

void yyerror(char *s) {
  fprintf(stderr, "Error: %s\n", s);
}

int main(void) {
    if (!yyparse())
        printf("Plik jest poprawny.\n");
    else
        printf("Plik jest niepoprawny.\n");
    return 0;
}