parser for c language help me

[~bleach~]

i want parser in language


i have grammer is that

SS->AAaBBb

AA->a|b

BB->aAA

this a letter for language a ,b

int lexan()
{
int lookahead;

lookahead=getchar();

return t;
}
int match(int t)
{
if(lookahead==t)
lookahead=lexan();
else error();
return lookahead;
}
void error()
{
printf(" error syntax");
}
void SS()
{
AA();
if(lookahead=='a')
match('a');
else error();
BB();
if(lookahead=='b')
match('b');
else error();
}

void AA()
{
if(lookahead=='a')
match('a');
else error();

if(lookahead=='b')
match('b');
else error();

}
void BB()
{
if(lookahead=='a')
match('a');
else error();
AA();
}

[WingedPanther]

I'm not clear on what you're asking for here.

Also, please use code tags with your code.

[MeTh0Dz]

Indentation wouldn't hurt either....

[~bleach~]

if we have word is ababab

this is currect language

but if we have langauge absddss

this not belong to our language

if any word exept letter a and b is currect other is faluse

i want function for this

[MeTh0Dz]

So you want a function to read a string of text and then check to see if there is any character besides an a or b in it?

If so that won't be hard to do at all, just check the character/memory at each location in the string.

[~bleach~]

yes and i want it like parser compiler

[MeTh0Dz]

What do you mean? Parsing is a part of a compiler, but it's not a compiler. All that parsing is, is taking a group of characters and analyzing them, then acting on them based on your algorithm or whatever.

[~bleach~]

yes part of it let see we have function s have laguae ab

we want parse if we enter aaaaaaaabbba

it's right language

but if we enter aaaaabaaad

it's not belong to our language

[MeTh0Dz]

Okay......... I understand that you want to parse a line of text.... But its not like your building a compiler. Just a second and I'll make a sample function.

[~bleach~]

ok thank you