Online PHP editor | rfc for gFMlR

@ 2014-08-02T22:37:59Z

<?php

function do_split($name) {
    return preg_split('/([A-Z]{2,}|([A-Z][^A-Z]*))/', $name, null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
}

function convert_case($name) {
    return implode(
        '_',
        array_map(
            'strtolower',
            do_split($name)
        )
    );
}

function convert_case2($in) {
	$len = strlen($in);
	if ($len < 2) {
		return strtolower($in);
	}
	$pos = 0;
	$out = '';
    $peek = function() use ($in, $pos, $len) {
        if ($pos+1 >= $len) {
            return null;
        }
        return $in[$pos+1];
    };
	$next = function() use ($peek, &$pos) {
        $c = $peek();
        if ($c === null) {
            return null;
        }
        $pos++;
        return $c;
	};
    $upper = function ($c) {
        return 'A' <= $c && $c <= 'Z';
    };
    $lower = function ($c) {
        return 'a' <= $c && $c <= 'z';
    };
    $alpha = function ($c) use ($upper, $lower) {
        return $upper($c) || $lower($c);
    };
    $num = function ($c) {
        return '0' <= $c && $c <= '9';
    };
    $alpha_num = function ($c) use ($alpha, $num) {
        return $alpha($c) || $num($c);
    };

	$start_state = function () use (&$out, $next, $peek) {
        for ($c = $next(); $c !== null; $c = next()) {
            $out .= $c;
        }
        return null;
	};

	$state = $start_state;
	while ($state !== null) {
		$state = $state();
	}
    return strtolower($out);
}

convert_case2('FooBARbar0123');

$samples = array(
    'FooBar',
    'FooBAR',
    'FOOBar',
    'foo_bar',
    'FOO_bar',
    'FOO_Bar',
    'foo_BAR',
    'foo_Bar',
    'Foo_bar',
);



print_r(array_map(function ($name) {
    return array(
        'name' => $name,
        'converted' => convert_case2($name),
        //        'converted' => convert_case($name),
    );
}, $samples));

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught ArgumentCountError: next() expects exactly 1 argument, 0 given in /in/gFMlR:55 Stack trace: #0 /in/gFMlR(55): next() #1 /in/gFMlR(63): {closure}() #2 /in/gFMlR(68): convert_case2('FooBARbar0123') #3 {main} thrown in /in/gFMlR on line 55
Process exited with code 255.

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