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|
implementation module Version
import StdInt, StdClass
:: VersionInfo =
{ versionCurrent
:: Int
, versionOldestDefinition
:: Int
, versionOldestImplementation
:: Int
}
:: VersionsCompatability
= VersionsAreCompatible
| VersionObservedIsTooOld
| VersionObservedIsTooNew
versionCompare :: VersionInfo VersionInfo -> VersionsCompatability
versionCompare expected observed
| expected.versionCurrent < observed.versionCurrent
| expected.versionCurrent >= observed.versionOldestDefinition
= VersionsAreCompatible
// otherwise
= VersionObservedIsTooNew
| expected.versionCurrent == observed.versionCurrent
= VersionsAreCompatible
// expected.versionCurrent > observed.versionCurrent
| expected.versionOldestImplementation <= observed.versionCurrent
= VersionsAreCompatible
// otherwise
= VersionObservedIsTooOld
|
