2023-09-14 03:24:02 +00:00
|
|
|
<?php
|
|
|
|
include_once("oracles/base.php");
|
|
|
|
class calculator extends oracle {
|
|
|
|
public $info = [
|
|
|
|
"name" => "calculator"
|
|
|
|
];
|
|
|
|
public function check_query($q) {
|
|
|
|
// straight numerics should go to that oracle
|
|
|
|
if (is_numeric($q)) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
// all chars should be number-y or operator-y
|
|
|
|
$char_whitelist = str_split("1234567890.+-/*^%() ");
|
|
|
|
foreach (str_split($q) as $char) {
|
|
|
|
if (!in_array($char, $char_whitelist)) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
// a custom parser and calculator because FUCK YUO, libraries are
|
|
|
|
// gay.
|
|
|
|
public function generate_response($q)
|
|
|
|
{
|
|
|
|
$nums = str_split("1234567890.");
|
|
|
|
$ops = str_split("+-/*^%;");
|
|
|
|
$grouping = str_split("()");
|
|
|
|
|
|
|
|
$q = str_replace(" ", "", $q);
|
|
|
|
|
|
|
|
// backstop for the parser so it catches the last
|
|
|
|
// numeric token
|
|
|
|
$q .= ";";
|
|
|
|
|
|
|
|
// the following comments refer to this example input:
|
|
|
|
// 21+9*(3+2^9)+1
|
|
|
|
|
|
|
|
// 2-length lists of the following patterns:
|
|
|
|
// ["n" (umeric), <some number>]
|
|
|
|
// ["o" (perator), "<some operator>"]
|
|
|
|
// ["g" (roup explicit), <"(" or ")">]
|
|
|
|
// e.g. [["n", 21], ["o", "+"], ["n", 9], ["o", *],
|
|
|
|
// ["g", "("], ["n", 3], ["o", "+"], ["n", 2],
|
|
|
|
// ["o", "^"], ["n", 9], ["g", ")"], ["o", "+"],
|
|
|
|
// ["n", "1"]]
|
|
|
|
$tokens = array();
|
|
|
|
$dragline = 0;
|
|
|
|
foreach(str_split($q) as $i=>$char) {
|
|
|
|
if (in_array($char, $nums)) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
elseif (in_array($char, $ops) || in_array($char, $grouping)) {
|
|
|
|
// hitting a non-numeric implies everything since the
|
|
|
|
// last hit has been part of a number
|
|
|
|
$capture = substr($q, $dragline, $i - $dragline);
|
|
|
|
// prevent the int cast from creating imaginary
|
|
|
|
// ["n", 0] tokens
|
|
|
|
if ($capture != "") {
|
|
|
|
if (substr_count($capture, ".") > 1) {
|
|
|
|
return "";
|
|
|
|
}
|
|
|
|
array_push($tokens, ["n", (float)$capture]);
|
|
|
|
}
|
|
|
|
// reset to one past the current (non-numeric) char
|
|
|
|
$dragline = $i + 1;
|
|
|
|
// the `;' backstop is not a real token and this should
|
|
|
|
// never be present in the token list
|
|
|
|
if ($char != ";") {
|
|
|
|
array_push($tokens, [
|
|
|
|
($char == "(" || $char == ")") ? "g" : "o",
|
|
|
|
$char
|
|
|
|
]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
return "";
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// two operators back to back should fail
|
|
|
|
for ($i = 1; $i < count($tokens); $i++) {
|
|
|
|
if ($tokens[$i][0] == "o" && $tokens[$i-1][0] == "o") {
|
|
|
|
return "";
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2023-09-15 00:10:13 +00:00
|
|
|
// no implicit multiplication
|
|
|
|
for ($i = 0; $i < count($tokens) - 1; $i++) {
|
|
|
|
if ($tokens[$i][0] == "n" && $tokens[$i+1] == ["g", "("]) {
|
|
|
|
return "";
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2023-09-14 03:24:02 +00:00
|
|
|
//strategy:
|
|
|
|
// traverse to group open (if there is one)
|
|
|
|
// - return to start with the internals
|
|
|
|
// traverse to ^, attack token previous and after
|
|
|
|
// same but for *, then / then + then -
|
|
|
|
// poppers all teh way down
|
|
|
|
try {
|
|
|
|
return [
|
|
|
|
substr($q, 0, strlen($q)-1)." = " => $this->executeBlock($tokens)[0][1]
|
|
|
|
];
|
|
|
|
}
|
|
|
|
catch (\Throwable $e) {
|
|
|
|
if (get_class($e) == "DivisionByZeroError") {
|
|
|
|
return [
|
|
|
|
$q." = " => "Division by Zero Error!!"
|
|
|
|
];
|
|
|
|
}
|
|
|
|
return "";
|
|
|
|
}
|
|
|
|
}
|
|
|
|
public function executeBlock($tokens) {
|
|
|
|
if (count($tokens) >= 2 && $tokens[0][0] == "o" && $tokens[0][1] == "-" && $tokens[1][0] == "n") {
|
|
|
|
array_splice($tokens, 0, 2, [["n", -1 * (float)$tokens[1][1]]]);
|
|
|
|
}
|
|
|
|
if (count($tokens) > 0 && $tokens[0][0] == "o" || $tokens[count($tokens)-1][0] == "o") {
|
|
|
|
throw new Exception("Error Processing Request", 1);
|
|
|
|
}
|
2023-09-23 02:44:33 +00:00
|
|
|
while (in_array(["g", "("], $tokens)) {
|
2023-09-14 03:24:02 +00:00
|
|
|
$first_open = array_search(["g", "("], $tokens);
|
|
|
|
$enclosedality = 1;
|
|
|
|
for ($i = $first_open+1; $i < count($tokens); $i++) {
|
|
|
|
if ($tokens[$i][0] == "g") {
|
|
|
|
$enclosedality += ($tokens[$i][1] == "(") ? 1 : -1;
|
|
|
|
}
|
|
|
|
if ($enclosedality == 0) {
|
|
|
|
array_splice($tokens,
|
|
|
|
$first_open,
|
|
|
|
$i+1 - $first_open,
|
|
|
|
$this->executeBlock(
|
|
|
|
array_slice($tokens, $first_open+1, $i-1 - $first_open)
|
|
|
|
)
|
|
|
|
);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
$operators_in_pemdas_order = [
|
|
|
|
"^" => (fn($x, $y) => $x ** $y),
|
|
|
|
"*" => (fn($x, $y) => $x * $y),
|
|
|
|
"/" => (fn($x, $y) => $x / $y),
|
|
|
|
"%" => (fn($x, $y) => $x % $y),
|
|
|
|
"+" => (fn($x, $y) => $x + $y),
|
|
|
|
"-" => (fn($x, $y) => $x - $y)
|
|
|
|
];
|
|
|
|
foreach ($operators_in_pemdas_order as $op=>$func) {
|
|
|
|
while (in_array(["o", $op], $tokens)) {
|
|
|
|
for ($i = 0; $i < count($tokens); $i++) {
|
|
|
|
if ($tokens[$i] == ["o", $op]) {
|
|
|
|
array_splice(
|
|
|
|
$tokens,
|
|
|
|
$i-1,
|
|
|
|
3,
|
|
|
|
[["n", (string)($func((float)$tokens[$i-1][1], (float)$tokens[$i+1][1]))]]
|
|
|
|
);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return $tokens;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
?>
|