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#!/usr/bin/perl

# http://perlmonks.org/?node_id=1210791

use strict;
use warnings;

sub error { die s/\G/ *** Expected @_ -->/r, "\n" }
sub want { /\G\s+/gc; /\G\Q$_[1]\E/gc ? shift : error "'$_[1]'" }

sub expr
  {
  my $p = shift;
  /\G\s+/gc;
  my $value =
    /\G(T|F)/gc ? $1 :
    /\G\(/gc    ? want expr(0), ')' :
    error "Operand";
  $value =
    /\G\s+/gc             ? $value :
    $p <= 1 && /\G\&\&/gc ? $value eq 'T' ? expr(2) : (expr(2), 'F') :
    $p <= 0 && /\G\|\|/gc ? $value eq 'T' ? (expr(1), 'T') : expr(1) :
    return $value while 1;
  }

while(<DATA>)
  {
  my $answer = expr(0);
  /\G\s*\z/ or error "Complete Parse";
  print tr/\n//dr, " = $answer\n";
  }

__DATA__
(T && F) || (F && F)
(T && T) || (F && F)
(T && F) || T
[download]

Outputs:

(T && F) || (F && F) = F
(T && T) || (F && F) = T
(T && F) || T = T
[download]

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