parse-svn-externals.php

<?php

/**
 * folder relative-folder
 * folder revision url
 * folder url
 * url folder
 * url revision folder
 * revision url folder
 * url@revision folder
 */


$s
    = "
third-party/sounds             http://svn.example.com/repos/sounds
third-party/skins -r148        http://svn.example.com/skinproj
third-party/skins/toolkit -r21 http://svn.example.com/skin-maker

http://svn.example.com/repos/sounds third-party/sounds
-r148 http://svn.example.com/skinproj third-party/skins
-r21  http://svn.example.com/skin-maker third-party/skins/toolkit

http://svn.example.com/repos/sounds third-party/sounds
http://svn.example.com/skinproj@148 third-party/skins
http://svn.example.com/skin-maker@21 third-party/skins/toolkit # fff
third-party/sounds ../foo/sounds
../foo/sounds third-party/sounds

";

$lines = preg_split("~\n~", $s, -1, PREG_SPLIT_NO_EMPTY);

$matches = array();
$externals = array();

foreach ($lines as $line) {

    $parts = preg_split("~[\s\t]+~", $line, -1, PREG_SPLIT_NO_EMPTY);
    $parts = array_map('trim', $parts);

    $external = array(
        'url'      => null,
        'folder'   => null,
        'revision' => null
    );

    foreach ($parts as $part) {

        if (strpos($part, '#') !== false) {
            break;
        }

        if (preg_match('~-r(\d+)~', $part, $matches)) {
            $external['revision'] = $matches[1];
            continue;
        }

        if (preg_match('~(.+)@(\d+)$~', $part, $matches)) {
            $external['url'] = $matches[1];
            $external['revision'] = $matches[2];
            continue;
        }

        if (preg_match('~^\.|://~', $part, $matches)) {
            $external['url'] = $part;
            continue;
        }

        $external['folder'] = $part;
    }

    $externals[] = $external;
}

print_r($externals);