47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
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package hcl
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// ExprCall tests if the given expression is a function call and,
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// if so, extracts the function name and the expressions that represent
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// the arguments. If the given expression is not statically a function call,
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// error diagnostics are 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 ExprCall that takes no arguments and returns
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// *StaticCall. This method should return nil if a static call 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 ExprCall(expr Expression) (*StaticCall, Diagnostics) {
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type exprCall interface {
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ExprCall() *StaticCall
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}
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physExpr := UnwrapExpressionUntil(expr, func(expr Expression) bool {
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_, supported := expr.(exprCall)
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return supported
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})
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if exC, supported := physExpr.(exprCall); supported {
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if call := exC.ExprCall(); call != nil {
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return call, 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 function call 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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// StaticCall represents a function call that was extracted statically from
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// an expression using ExprCall.
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type StaticCall struct {
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Name string
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NameRange Range
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Arguments []Expression
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ArgsRange Range
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}
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