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Implement #let functionality
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4 changed files with 23 additions and 37 deletions
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@ -46,7 +46,19 @@ module Spectator
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macro let(name, &block)
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module Context
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@_%proxy : ValueProxy?
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def {{name.id}}
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if (proxy = @_%proxy)
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proxy.as(TypedValueProxy(typeof({{name.id}}!))).value
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else
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{{name.id}}!.tap do |value|
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@_%proxy = TypedValueProxy(typeof({{name.id}}!)).new(value)
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end
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end
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end
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def {{name.id}}!
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{{block.body}}
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end
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end
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@ -1,36 +0,0 @@
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require "./value_proxy"
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module Spectator
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# Lazy initialization of a value.
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# Constructs a value only once by calling a `Proc`.
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# The value is then stored and reused - the `Proc` is only called once.
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class LazyValueProxy(T) < ValueProxy
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@value_or_block : Proc(T) | T
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# Creates a lazy instance.
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# The block provided to this method will be called
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# when `#value` is invoked.
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# The block will only be called once,
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# and the result of the block will be cached.
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def initialize(&block : -> T)
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@value_or_block = block
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end
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# Retrieves the lazy initialized value.
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# The first call to this method will create the value.
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# Subsequent calls will return the same value.
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def value
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if value = @value_or_block.as?(T)
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return value
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else
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@value_or_block = construct
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end
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end
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# Calls the block used to construct the value.
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# This method can only be called once per instance.
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private def construct : T
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@value_or_block.as(Proc(T)).call
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end
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end
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end
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10
src/spectator/typed_value_proxy.cr
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10
src/spectator/typed_value_proxy.cr
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@ -0,0 +1,10 @@
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require "./value_proxy"
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module Spectator
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class TypedValueProxy(T) < ValueProxy
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getter value : T
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def initialize(@value : T)
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end
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end
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end
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@ -2,7 +2,7 @@ module Spectator
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# Base class for proxying test values to examples.
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# This abstraction is required for inferring types.
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# The `DSL#let` macro makes heavy use of this.
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protected abstract class ValueProxy
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private abstract class ValueProxy
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# Retrieves the underlying value.
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abstract def value
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end
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