Online PHP editor | output for SuFri

@ 2014-01-25T20:26:08Z

<?php

$rules = [
    [0, '(',   '_', 0, ['_', 'x']],
    [0, '(',   'x', 0, ['x', 'x']],
    [0, ')',   'x', 0, []],
    [0, 'EOF', '_', 1, []],
];

$state = 0;
$accept_states = [1];
$init_stack = '_';

$input = '(((()))())';

$tokens = array_merge(
    str_split($input),
    ['EOF']
);

function match(array $rules, $state, $token, $top) {
    foreach ($rules as $rule) {
        list($init_state, $match_input, $match_stack, $new_state, $push_stack) = $rule;

        if ($state === $init_state
            && $token === $match_input
            && $top === $match_stack) {

            return $rule;
        }
    }

    $token = var_export($token, true);
    throw new \RuntimeException("No rule found for state $state, token $token");
}

$stack = new \SplStack();
$stack->push($init_stack);

foreach ($tokens as $token) {
    $top = $stack->pop();
    $rule = match($rules, $state, $token, $top);

    list($init_state, $match_input, $match_stack, $new_state, $push_stack) = $rule;

    $state = $new_state;
    foreach ($push_stack as $push_token) {
        $stack->push($push_token);
    }
}

if (!in_array($state, $accept_states)) {
    throw new \RuntimeException("Reached EOF but ended in state $state which is not an accept state.");
}

echo "The provided input has been accepted by accept state $state\n";
echo sprintf("Stack: %s\n", json_encode(iterator_to_array($stack)));

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Parse error: syntax error, unexpected token "match", expecting "(" in /in/SuFri on line 21
Process exited with code 255.
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Parse error: syntax error, unexpected token "match", expecting "(" in /in/SuFri on line 21
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33: The provided input has been accepted by accept state 1 Stack: []
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/SuFri on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/SuFri on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/SuFri on line 3
Process exited with code 255.

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