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function is_undef(value) { return typeof value === 'undefined' }
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function coalesce(value, empty) { return !is_undef(value) ? value : empty }
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function starts_with(str, prefix)
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{
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	return str.substr(0, prefix.length) === prefix
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}
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function ends_with(str, suffix) { return str.substr(-suffix.length) === suffix }
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function rm_prefix(prefix, str)
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{
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	return starts_with(str, prefix) ? str.substr(prefix.length) : 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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		str.substr(0, str.length - suffix.length) : str
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}
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function partition(str, delim)
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{
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	var delim_idx = str.indexOf(delim)
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	return delim_idx >= 0 ? {head: str.substr(0, delim_idx),
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		tail: str.substr(delim_idx+delim.length)} : {head: str, tail: ''}
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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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	path = /^([\w-]*)(.*)$/.exec(path)
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	return {head: path[1], tail: rm_prefix('.', path[2])}
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}
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function strip_url(url) { return rm_suffix('#', url) }
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