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72 lines
1.7 KiB
Text
72 lines
1.7 KiB
Text
succeed = \val =>
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Success val
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fail = \val =>
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Failure val
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echo = \str =>
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Echo fail succeed str
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readInput =
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Read fail succeed
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map = \convert task =>
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after task \output =>
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succeed (convert output)
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mapErr = \convert task =>
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fallback task \err =>
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fail (convert err)
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after = \task cont =>
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case task
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when Success val then cont val
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when Failure val then Failure val
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when Echo onFailure prevCont str then
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Echo
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(\ioErr => after (onFailure ioErr) cont)
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(\{} => after (prevCont {}) cont)
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str
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when Read onFailure prevCont then
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Read
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(\ioErr => after (onFailure ioErr) cont)
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(\str => after (prevCont str) cont)
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fallback = \task onFailure =>
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case task
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when Success val then Success val
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when Failure val then onFailure val
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when Echo prevOnFailure cont str then
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Echo
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(\ioErr => fallback (prevOnFailure ioErr) onFailure)
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(\{} => fallback (cont {}) onFailure)
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str
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when Read prevOnFailure cont then
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Read
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(\ioErr => fallback (prevOnFailure ioErr) onFailure)
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(\str => fallback (cont str) onFailure)
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###############################################################
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# In the future everything above here will be in a platform. #
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###############################################################
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program =
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after (echo "What is your first name?") \{} =>
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after readInput \firstName =>
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after (echo "Hi \(firstName)! What is your last name?") \{} =>
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after readInput \lastName =>
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echo "Your full name is: \(firstName) \(lastName)"
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program
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