38 lines
1.2 KiB
Go
38 lines
1.2 KiB
Go
package hcl
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// ExprList tests if the given expression is a static list construct and,
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// if so, extracts the expressions that represent the list elements.
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// If the given expression is not a static list, error diagnostics are
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// returned.
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//
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// A particular Expression implementation can support this function by
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// offering a method called ExprList that takes no arguments and returns
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// []Expression. This method should return nil if a static list cannot
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// be extracted. Alternatively, an implementation can support
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// UnwrapExpression to delegate handling of this function to a wrapped
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// Expression object.
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func ExprList(expr Expression) ([]Expression, Diagnostics) {
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type exprList interface {
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ExprList() []Expression
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}
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physExpr := UnwrapExpressionUntil(expr, func(expr Expression) bool {
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_, supported := expr.(exprList)
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return supported
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})
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if exL, supported := physExpr.(exprList); supported {
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if list := exL.ExprList(); list != nil {
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return list, nil
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}
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}
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return nil, Diagnostics{
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&Diagnostic{
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Severity: DiagError,
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Summary: "Invalid expression",
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Detail: "A static list expression is required.",
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Subject: expr.StartRange().Ptr(),
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},
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}
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}
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