Hi! I try to make a syntactic recognizer. In the language can be included also comments of the type " # <comment> ". I have made two files: prova.lex and prova.y for flex and bison. A comment consists of a list (also empty) of identifier. But I get always syntax errors. We enclose the files prova.lex, prova.y, a file for the compilation (compila) and an input file (prova.E) Thank you. Stefano
-- Stefano Simonucci GNU/Linux User: #81790 http://counter.li.org
%{
#include <string.h>
%}
delim [ \t\n]
ws {delim}+
letter [A-Za-z]
digit [0-9]
id {letter}({letter}|{digit})*
num {digit}+|{digit}+\.{digit}*|{digit}+\.{digit}*{digit}*e\-{digit}+
%%
{ws} { printf("\n"); return '\n'; }
{id} { strcpy(yylval.lexeme, yytext);
printf("%s ",yytext);
return ID;
}
{num} { strcpy(yylval.lexeme, yytext);
return NUM;
}
"+" return '+';
"-" return '-';
"*" return '*';
"/" return '/';
"(" return '(';
")" return ')';
"," return ',';
"=" return '=';
"#" { printf("#"); return '#'; }
%{
#include <stdio.h>
%}
%union
{ char lexeme[100+1]; }
%token <lexeme> ID
%token <lexeme> NUM
%left '+' '-'
%left '*' '/'
%right UNIMINUS UNIPLUS '#'
%start init
%type <lexeme> term
%%
init : /* empty */
| init line
;
line : '\n'
| '#' comment '\n'
;
comment : /* empty line */
| comment term
term : ID {sprintf($$,"%s",$1); }
| NUM {sprintf($$,"%s",$1); }
;
%%
#include "lex.yy.c"
int main()
{
return yyparse();
}
compila
Description: application/shellscript
reticolo=set(vecX,vecY);
typefunction fespace(reticolo Q)
{
double A(Q.Nx,Q.Ny); symbol R=Q;
}
reticolo Q;
VQ=fespace(Q);
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