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authorLoïc Hoguin <[email protected]>2017-06-28 17:38:17 +0200
committerLoïc Hoguin <[email protected]>2017-06-28 17:38:17 +0200
commitc22173037134becbac882533f80339f4127a8ad2 (patch)
tree666fc6e31c9e02766eb33ecadc5068dd54e18aa4 /CONTRIBUTING.asciidoc
parent3eb7693e4fd7e1172b55b30ab25c5656040d1fd2 (diff)
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Improve the interface for constraints
There are two important changes in this commit. Constraints are now producing an error tuple. This error tuple in turn can be provided to a function for formatting a human readable error message. Both the error tuple and the formatting code are controlled by and part of the constraint function. Constraints now also implement the reverse operation. When constraint functions only validate, the reverse operation will be the same as the forward operation. When they also do some conversion then the reverse operation will reverse it. Since constraints are now performing 3 different operations (forward, reverse and format_error), they now take the form of a function accepting two separate arguments. The operation is the first argument. In addition, the return value was changed to take the form of {ok, Value} | {error, Reason}. The value must be returned as-is if it was not modified.
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