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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package dynblock
import (
"github.com/hashicorp/hcl/v2"
"github.com/zclconf/go-cty/cty"
)
type exprWrap struct {
hcl.Expression
i *iteration
// resultMarks is a set of marks that must be applied to whatever
// value results from this expression. We do this whenever a
// dynamic block's for_each expression produced a marked result,
// since in that case any nested expressions inside are treated
// as being derived from that for_each expression.
//
// (calling applications might choose to reject marks by passing
// an [OptCheckForEach] to [Expand] and returning an error when
// marks are present, but this mechanism is here to help achieve
// reasonable behavior for situations where marks are permitted,
// which is the default.)
resultMarks cty.ValueMarks
}
func (e exprWrap) Variables() []hcl.Traversal {
raw := e.Expression.Variables()
ret := make([]hcl.Traversal, 0, len(raw))
// Filter out traversals that refer to our iterator name or any
// iterator we've inherited; we're going to provide those in
// our Value wrapper, so the caller doesn't need to know about them.
for _, traversal := range raw {
rootName := traversal.RootName()
if rootName == e.i.IteratorName {
continue
}
if _, inherited := e.i.Inherited[rootName]; inherited {
continue
}
ret = append(ret, traversal)
}
return ret
}
func (e exprWrap) Value(ctx *hcl.EvalContext) (cty.Value, hcl.Diagnostics) {
if e.i == nil {
// If we don't have an active iteration then we can just use the
// given EvalContext directly.
return e.prepareValue(e.Expression.Value(ctx))
}
extCtx := e.i.EvalContext(ctx)
return e.prepareValue(e.Expression.Value(extCtx))
}
// UnwrapExpression returns the expression being wrapped by this instance.
// This allows the original expression to be recovered by hcl.UnwrapExpression.
func (e exprWrap) UnwrapExpression() hcl.Expression {
return e.Expression
}
func (e exprWrap) prepareValue(val cty.Value, diags hcl.Diagnostics) (cty.Value, hcl.Diagnostics) {
return val.WithMarks(e.resultMarks), diags
}
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