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Martin Vogel
a9d7a96227
Terraform references were resolved by the generic name matcher: by their
last name segment, across the whole repository. `format()` CALLS a
variable named format of another module, `local.x` meets a resource named
local, `.id` an output id anywhere. Measured on the 7 Terraform
repositories of 17 infrastructure corpora: 12,437 edges, recall 0.63 and
precision 0.39 against an independent reading of the references, and not
one of them left the block holding its reference.
A reference -- var.X, local.X, module.X, data.T.N, T.N -- now USAGEs
{ref, via: terraform, line}, from the top-level block holding it, the
block declaring it in the same module: the .tf / .tofu files of its
directory (a locals entry: its locals block); an entry of the block's
depends_on list DEPENDS_ON the object instead. The generic matcher makes
no edge for a .tf / .tofu file any more; a name only mentioned in string
text is no reference, nor is a block's reference to itself. A changed
file re-resolves its whole directory, so an unchanged file's reference
meets the declaration a change adds and loses the one it removes.
A bare block label (`variable region {}`, valid HCL) now names its block
like a quoted one; such blocks used to share the keyword's name and QN.
Measured: 7,771 of 7,771 file-level and 13,397 of 13,397 block-level
reference pairs (edge type included) and nothing else; the 10 other
corpora are unchanged; deterministic over three runs; the incremental
re-index equals a full index in 7 scenarios (rename a variable, a module,
a locals entry; delete the variables file; add a file; add a declaration
an unchanged file references; quote a bare label); index time unchanged
(within 1 % on the four largest Terraform corpora).
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>