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Matcher for one of a collection of patterns.
class option matcher[readonly value element type, covariant any value result type]
extends option pattern[element type]
implements matcher[element type, result type]
option matcher(readonly collection[matcher[element type, result type]] matchers)
super(matchers !> readonly collection[pattern[element type]])
void add matcher(matcher[element type, result type] the matcher)
add option(the matcher)
Parse the list and produce a result. Assumes this pattern matches the list.
implement result type or null parse(readonly list[element type] the list)
for (option : options)
if option(the list)
if option is matcher
return the matcher • parse(the list) !> result type
else
return missing • instance
utilities • panic("Can't parse list in option_matcher")
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