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This package provides a more generic version of what's currently modeled by the likes of lang.Scope and lang.Data, designed to avoid having a huge single type that must know about everything in the language and, for this package's purposes alone, to avoid knowing anything about the language at all except that it uses HCL. This is currently just an experiment not used by anything, and so is dead code aside from the contrived mini-language implemented in example_test.go. Signed-off-by: Martin Atkins <mart@degeneration.co.uk>
34 lines
1.2 KiB
Go
34 lines
1.2 KiB
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 exprs
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import (
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"github.com/hashicorp/hcl/v2"
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"github.com/opentofu/opentofu/internal/tfdiags"
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)
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// SymbolTable is an interface implemented by types that have an associated
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// symbol table, meaning that they contain a set of attributes that can be
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// looked up by name.
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type SymbolTable interface {
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// ResolveSymbol looks up a symbol by name, either returning what it
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// refers to or error diagnostics if no such symbol exists.
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ResolveAttr(ref hcl.TraverseAttr) (Attribute, tfdiags.Diagnostics)
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// HandleInvalidStep is called if a reference contains anything other
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// than an attribute access at a position handled by a symbol table,
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// so that the symbol table can produce a specialized error message
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// explaining what kind of attributes are expected.
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//
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// The given source range refers either to the non-attribute step that
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// was encountered or, if the problem is that nothing was present at all,
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// then to the entire reference expression visited so far.
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//
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// The result of this method MUST include at least one error diagnostic.
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HandleInvalidStep(rng tfdiags.SourceRange) tfdiags.Diagnostics
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}
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