rule

composer.json

{
    "require": {
        "php": ">=5.3.2",
        "hoa/compiler": "master"
    },
    "autoload":     {
        "psr-0": {
            "Rulez": "src/"
        }
    },
    "minimum-stability": "dev"
}

rule.pp

%skip   space         \s
// Scalars.
%token  true          true|TRUE
%token  false         false|FALSE
%token  null          null|NULL
// Strings.
%token  string        ("|')(.*?)(?<!\\)\1
%token  number         \d+
%token  bracket_      \(
%token _bracket       \)
// Comparator
%token  isNot         (is not|IS NOT)
%token  is            (is|IS)
%token  and           AND
%token  nand          NAND
%token  or            OR
%token  nor           NOR
%token  xor           XOR
%token  xnor          XNOR
%token  operator      [^\s]+

expression:
    condition()
    ( (::and:: #and | ::nand:: #nand | ::or:: #or | ::nor:: #nor | ::xor:: #xor | ::xnor:: #xnor) expression())?

#condition:
    (::bracket_:: expression() ::_bracket::)
    | string() operator() value()

string:
    <string>

number:
    <number>

operator:
    <operator> | <is> | <isNot>

value:
    <true> | <false> | <null> | string() | number()

toto.php

<?php

require "vendor/autoload.php";

from('Hoa')
    ->import('Compiler.Llk')
    ->import('File.Read')
    ->import('Compiler.Visitor.Dump')
    ;

$compiler = \Hoa\Compiler\Llk::load(
    new \Hoa\File\Read('Rulez.pp')
);

$str = '("1" != "toto \"é oajdaa" AND "1" > 20) OR "toto" > 10 XOR "tata" IS NOT NULL AND "tata" cu TRUE';

$ast      = $compiler->parse($str);

$dump     = new Hoa\Compiler\Visitor\Dump();
echo $dump->visit($ast);