45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
package hcl
|
|
|
|
// ExprMap tests if the given expression is a static map construct and,
|
|
// if so, extracts the expressions that represent the map elements.
|
|
// If the given expression is not a static map, error diagnostics are
|
|
// returned.
|
|
//
|
|
// A particular Expression implementation can support this function by
|
|
// offering a method called ExprMap that takes no arguments and returns
|
|
// []KeyValuePair. This method should return nil if a static map cannot
|
|
// be extracted. Alternatively, an implementation can support
|
|
// UnwrapExpression to delegate handling of this function to a wrapped
|
|
// Expression object.
|
|
func ExprMap(expr Expression) ([]KeyValuePair, Diagnostics) {
|
|
type exprMap interface {
|
|
ExprMap() []KeyValuePair
|
|
}
|
|
|
|
physExpr := UnwrapExpressionUntil(expr, func(expr Expression) bool {
|
|
_, supported := expr.(exprMap)
|
|
return supported
|
|
})
|
|
|
|
if exM, supported := physExpr.(exprMap); supported {
|
|
if pairs := exM.ExprMap(); pairs != nil {
|
|
return pairs, nil
|
|
}
|
|
}
|
|
return nil, Diagnostics{
|
|
&Diagnostic{
|
|
Severity: DiagError,
|
|
Summary: "Invalid expression",
|
|
Detail: "A static map expression is required.",
|
|
Subject: expr.StartRange().Ptr(),
|
|
},
|
|
}
|
|
}
|
|
|
|
// KeyValuePair represents a pair of expressions that serve as a single item
|
|
// within a map or object definition construct.
|
|
type KeyValuePair struct {
|
|
Key Expression
|
|
Value Expression
|
|
}
|