Online PHP editor | perf for CWhCc

@ 2014-08-02T23:20:22Z

<?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);
	}

    // no state
    $upper = function ($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);
    };

    // stream state
	$pos = 0;
    $char = $in[0];
    $peek = function() use ($in, &$pos, $len) {
        if ($pos+1 >= $len) {
            return null;
        }
        return $in[$pos+1];
    };
	$next = function() use ($peek, &$pos, &$char) {
        $char = $peek();
        $pos++;
        return $char !== null;
	};

    // lex state
	$out = array();

    $find_word = null;
    $upper_word = null;
    $lower_word = null;
    $cap_word = null;
    $num_word = null;

	$find_word = function () use (&$char, $alpha_num, $lower, $upper, $next, $peek, &$lower_word, &$upper_word, &$cap_word, &$num_word) {
        while (!$alpha_num($char)) {
            if (!$next()) {
                return null;
            }
        }
        if ($lower($char)) {
            return $lower_word;
        }
        if ($upper($char)) {
        	if ($upper($peek()) { // uppercase word
        	    return $upper_word;
    	    }
	        return $cap_word; // capitalized word
        }
        return $num_word;
	};

    $upper_word = function() use (&$out, &$char, $next, $upper, &$find_word) {
        $word = $char;
        while ($next() && $upper($char)) {
            $word .= $char;
        }
        $out[] = $word;
        return $find_word;
    };

	$state = $find_word;
	while ($state !== null) {
		$state = $state();
	}
    return strtolower(implode('_', $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));

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
5.4.31	0.005	0.046	12.54
5.4.30	0.010	0.040	12.54
5.4.29	0.005	0.040	12.54
5.4.28	0.008	0.037	12.43
5.4.27	0.011	0.037	12.43
5.4.26	0.010	0.052	12.43
5.4.25	0.008	0.041	12.43
5.4.24	0.011	0.047	12.43
5.4.23	0.009	0.051	12.43
5.4.22	0.008	0.036	12.43
5.4.21	0.006	0.038	12.42
5.4.20	0.012	0.039	12.43
5.4.19	0.007	0.035	12.42
5.4.18	0.005	0.036	12.42
5.4.17	0.004	0.038	12.43
5.4.16	0.006	0.040	12.42
5.4.15	0.008	0.034	12.42
5.4.14	0.006	0.037	12.11
5.4.13	0.007	0.037	12.09
5.4.12	0.007	0.035	12.06
5.4.11	0.004	0.038	12.05
5.4.10	0.008	0.033	12.05
5.4.9	0.005	0.040	12.05
5.4.8	0.007	0.040	12.05
5.4.7	0.007	0.044	12.05
5.4.6	0.005	0.040	12.05
5.4.5	0.013	0.045	12.05
5.4.4	0.011	0.044	12.04
5.4.3	0.006	0.039	12.03
5.4.2	0.004	0.037	12.03
5.4.1	0.009	0.036	12.04
5.4.0	0.007	0.041	11.52
5.3.28	0.005	0.043	12.71
5.3.27	0.008	0.039	12.73
5.3.26	0.007	0.044	12.73
5.3.25	0.007	0.038	12.73
5.3.24	0.009	0.041	12.72
5.3.23	0.004	0.040	12.72
5.3.22	0.004	0.040	12.69
5.3.21	0.009	0.037	12.69
5.3.20	0.009	0.037	12.68
5.3.19	0.005	0.042	12.69
5.3.18	0.006	0.037	12.69
5.3.17	0.007	0.036	12.69
5.3.16	0.015	0.043	12.68
5.3.15	0.010	0.034	12.69
5.3.14	0.009	0.035	12.68
5.3.13	0.010	0.039	12.67
5.3.12	0.013	0.035	12.67
5.3.11	0.008	0.041	12.67
5.3.10	0.010	0.036	12.16
5.3.9	0.007	0.039	12.14
5.3.8	0.008	0.044	12.13
5.3.7	0.007	0.038	12.13
5.3.6	0.008	0.038	12.12
5.3.5	0.006	0.037	12.06
5.3.4	0.007	0.036	12.06
5.3.3	0.008	0.033	12.02
5.3.2	0.004	0.036	11.80
5.3.1	0.006	0.034	11.77
5.3.0	0.007	0.041	11.75
5.2.17	0.006	0.030	9.23
5.2.16	0.006	0.028	9.23
5.2.15	0.006	0.031	9.23
5.2.14	0.008	0.039	9.22
5.2.13	0.005	0.029	9.18
5.2.12	0.007	0.027	9.18
5.2.11	0.004	0.036	9.20
5.2.10	0.007	0.028	9.19
5.2.9	0.006	0.031	9.19
5.2.8	0.003	0.033	9.18
5.2.7	0.008	0.032	9.18
5.2.6	0.011	0.036	9.14
5.2.5	0.009	0.032	9.11
5.2.4	0.009	0.036	9.08
5.2.3	0.007	0.040	9.05
5.2.2	0.010	0.033	9.05
5.2.1	0.010	0.035	8.96
5.2.0	0.011	0.035	8.82
5.1.6	0.004	0.030	8.10
5.1.5	0.008	0.030	8.10
5.1.4	0.004	0.026	8.08
5.1.3	0.006	0.031	8.43
5.1.2	0.012	0.030	8.45
5.1.1	0.005	0.031	8.18
5.1.0	0.005	0.026	8.18
5.0.5	0.003	0.026	6.66
5.0.4	0.003	0.021	6.51
5.0.3	0.003	0.033	6.33
5.0.2	0.004	0.019	6.29
5.0.1	0.003	0.021	6.27
5.0.0	0.004	0.031	6.27
4.4.9	0.006	0.013	4.77
4.4.8	0.004	0.015	4.75
4.4.7	0.003	0.016	4.76
4.4.6	0.003	0.016	4.76
4.4.5	0.003	0.019	4.77
4.4.4	0.001	0.029	4.71
4.4.3	0.002	0.021	4.76
4.4.2	0.005	0.020	4.84
4.4.1	0.003	0.018	4.85
4.4.0	0.007	0.023	4.76
4.3.11	0.003	0.017	4.67
4.3.10	0.005	0.019	4.66
4.3.9	0.003	0.021	4.64
4.3.8	0.001	0.032	4.58
4.3.7	0.004	0.018	4.63
4.3.6	0.003	0.016	4.62
4.3.5	0.003	0.016	4.63
4.3.4	0.004	0.024	4.54
4.3.3	0.001	0.018	3.32
4.3.2	0.001	0.017	3.29
4.3.1	0.003	0.017	3.25
4.3.0	0.007	0.023	7.16

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