[Runtime] Generate server variables #64
Merged
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Motivation
The runtime side of apple/swift-openapi-generator#24.
Modifications
Added an SPI
ServerVariable
type and a variant of theURL.init(validatingOpenAPIServerURL:variables:)
method, which takes the template and variables and returns a fully formed concrete URL.Result
Unblocked the generator half of supporting server variables.
Test Plan
Added unit tests.