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In "package tofu" today we try to do everything using a generic acyclic graph model and generic graph walk, which _works_ but tends to make every other part of the problem very hard to follow because we rely a lot on sidecar shared mutable data structures to propagate results between the isolated operations. This is the beginning of an experimental new way to do it where the "graph" is implied by a model that more closely represents how the language itself works, with explicit modelling of the relationships between different types of objects and letting results flow directly from one object to another without any big shared mutable state. There's still a lot to do before this is actually complete enough to evaluate whether it's a viable new design, but I'm considering this a good starting checkpoint since there's enough here to run a simple test of propagating data all the way from input variables to output values via intermediate local values. Signed-off-by: Martin Atkins <mart@degeneration.co.uk>
18 lines
828 B
Go
18 lines
828 B
Go
// Copyright (c) The OpenTofu Authors
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// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2023 HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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// Package eval aims to encapsulate the details of evaluating the objects
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// in an overall configuration, including all of the expressions written inside
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// their declarations, in a way that can be reused across various different
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// phases of execution.
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//
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// The scope of this package intentionally excludes concepts like prior state,
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// plans, etc, focusing only on dealing with the relationships between objects
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// in a configuration. This package is therefore intended to be used as an
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// implementation detail of higher-level operations like planning, with the
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// caller using the provided hooks to incorporate the results of side-effects
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// managed elsewhere.
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package eval
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