<?php
class Trie {
public $data = [];
public $value = false;
}
$tokens = [
"apple" => "T_APPLE",
"ape" => "T_APE",
"cape" => "T_CAPE",
"(" => "T_L_PARENTH",
")" => "T_R_PARENTH",
"is_string" => "T_IS_STRING",
"is_bool" => "T_IS_BOOL",
"!is_bool" => "T_NOT_IS_BOOL",
"&" => "T_AND",
"|" => "T_OR",
];
$root = new Trie;
foreach ($tokens as $name => $value) {
$node = $root;
// For each character in the string
for ($i = 0; $i < strlen($name); $i++) {
$char = $name[$i];
if (!isset($node->data[$char])) {
// If we don't have a child with that char
// Create it
$node->data[$char] = new Trie;
}
// Reset the node for the next character
$node = $node->data[$char];
}
// Finally, set the value on the final node
$node->value = $value;
}
function lex($string, Trie $root) {
$length = strlen($string);
$i = 0;
$tokens = [];
$node = $root;
$buffer = '';
// We want to iterate over the entire string.
while ($i < $length) {
// Get the current character
$char = $string[$i];
if (isset($node->data[$char])) {
// We have a valid next character
$i++;
// Save the character in the buffer
$buffer .= $char;
// Move to the next state
$node = $node->data[$char];
} elseif ($node->value) {
// We have a value and no valid next character
// Emit the token
$tokens[] = [$node->value, $buffer];
// Clear the buffer
$buffer = '';
// Reset back to the root for the next token
$node = $root;
} else {
// We can't continue parsing this node
throw new Exception("Syntax error at offset $i");
}
}
if ($buffer !== '') {
// We finished without flushing one token
if ($node->value) {
$tokens[] = [$node->value, $buffer];
} else {
// Not a valid complete token
throw new Exception("Syntax error at offset $i");
}
}
return $tokens;
}
// var_dump(lex('(is_string)', $root));
$lexedList = lex('(is_string)&(is_string|!is_bool)', $root);
// get stuff between each parenth, put them in things, then use the & / | to compare the two
//var_dump($lexedList);
foreach ($lexedList as $key => $lexed) {
//$lexed[0] = str_replace('is_string', 'is_string($test)', $lexed[0]);
$lexed[1] = str_replace('is_string', 'is_string($test)', $lexed[1]);
$lexed[1] = str_replace('is_bool', 'is_bool($test)', $lexed[1]);
$lexedList[$key] = $lexed[1];
}
//var_dump($lexedList);
$test = "fuck";
$eh = implode("", $lexedList);
var_dump($eh);
$result = eval($eh);
var_dump($result);