Method Value

hclsyntax/expression.go:221–633

(ctx *hcl.EvalContext)

}

func (e *FunctionCallExpr) Value(ctx *hcl.EvalContext) (cty.Value, hcl.Diagnostics) {
	var diags hcl.Diagnostics

	var f function.Function
	exists := false
	hasNonNilMap := false
	thisCtx := ctx
	for thisCtx != nil {
		if thisCtx.Functions == nil {
			thisCtx = thisCtx.Parent()
			continue
		}
		hasNonNilMap = true
		f, exists = thisCtx.Functions[e.Name]
		if exists {
			break
		}
		thisCtx = thisCtx.Parent()
	}

	if !exists {
		if !hasNonNilMap {
			return cty.DynamicVal, hcl.Diagnostics{
				{
					Severity:    hcl.DiagError,
					Summary:     "Function calls not allowed",
					Detail:      "Functions may not be called here.",
					Subject:     e.Range().Ptr(),
					Expression:  e,
					EvalContext: ctx,
				},
			}
		}

		extraUnknown := &functionCallUnknown{
			name: e.Name,
		}

		// For historical reasons, we represent namespaced function names
		// as strings with :: separating the names. If this was an attempt
		// to call a namespaced function then we'll try to distinguish
		// between an invalid namespace or an invalid name within a valid
		// namespace in order to give the user better feedback about what
		// is wrong.
		//
		// The parser guarantees that a function name will always
		// be a series of valid identifiers separated by "::" with no
		// other content, so we can be relatively unforgiving in our processing
		// here.
		if sepIdx := strings.LastIndex(e.Name, "::"); sepIdx != -1 {
			namespace := e.Name[:sepIdx+2]
			name := e.Name[sepIdx+2:]

			avail := make([]string, 0, len(ctx.Functions))
			for availName := range ctx.Functions {
				if strings.HasPrefix(availName, namespace) {
					avail = append(avail, availName)
				}