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Check fqn prefix for dependencies, not direct match. #5

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Allows a declared dependency 'a -> b' to satisfy a module dependency 'a.x.y -> b.z'.

Allows a declared dependency 'a -> b' to satisfy a module dependency 'a.x.y -> b.z'.
…ency crossing that package boundary

ie. if you have 'a -> b', you can have a.x import b.y, but only if neither a nor b have dependencies going into or out of them from elsewhere.

a -> b, a -> a.x: allow a.x -> b.y
a -> b, a.x -> a.y: allow a.x -> b.y
a -> b, a.x -> z.x: don't allow a.x -> b.y
a -> b, z.x -> b.y: don't allow a.x -> b.y

bool canDepend(const string client, const string supplier)
{
// a -> b allows a.x -> b.y, unless there's a dependency a.x -> [not a].* or [not b].* -> b.y
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Do we really want this?
If we want to be specific for c with a.x -> c.z and c.z -> b.y, then we can no longer be less specific for a -> b?

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@FeepingCreature FeepingCreature Jan 17, 2020

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The intuition is that "any arrows that pierce the boundary of a remove the opacity of a". It may be misleading to have an arrow pointing into or out of a in the diagram, and have further modules in a allowed to do undeclared imports anyways.

Besides, you're the one who asked for this. :)

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My idea was: if there are specific dependencies like a.x -> b.y, then the general dependency a -> b (from another diagram) shall be removed from the target dependencies. The remaining target dependencies shall be used to match prefixes of the actual dependencies.

(So a.x -> c.z would not effect a -> b.)

My hope is: the corresponding implementation is much closer to "can still be understood next month" than the current one.

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I think the most important feature of the implementation is understanding what it's supposed to accomplish. I haven't understood that with yours yet.

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