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<?php
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function starts_with($str, $prefix)
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{
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return substr($str, 0, strlen($prefix)) === $prefix;
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}
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function ends_with($str, $suffix)
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{
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return substr($str, -strlen($suffix)) === $suffix;
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}
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function rm_prefix($prefix, $str)
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{
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return starts_with($str, $prefix) ? substr($str, strlen($prefix)) : $str;
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}
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function rm_suffix($suffix, $str)
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{
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return ends_with($str, $suffix) ?
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substr($str, 0, strlen($str) - strlen($suffix)) : $str;
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}
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class Path
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{
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public $head;
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public $tail;
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function Path($head, $tail)
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{
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$this->head = $head;
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$this->tail = $tail;
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}
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}
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function partition($str, $delim)
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{
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$delim_idx = strpos($delim, $str);
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return $delim_idx !== false ? new Path(substr($str, 0, $delim_idx),
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substr($str, $delim_idx+strlen($delim))) : new Path($str, "");
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}
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function parse_dot_path($path) { return partition($path, "."); }
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function parse_mixed_path($path)
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{
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preg_match('/^([\w-]*)(.*)$/', $path, $path);
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return new Path($path[1], rm_prefix(".", $path[2]));
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}
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function strip_url($url) { return rm_suffix("#", $url); }
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?>
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