Function Copy

common/ast/ast.go:133–150

Copy creates a deep copy of the Expr and SourceInfo values in the input AST. Copies of the Expr value are generated using an internal default ExprFactory.

(a *AST)

//
// Copies of the Expr value are generated using an internal default ExprFactory.
func Copy(a *AST) *AST {
	if a == nil {
		return nil
	}
	e := defaultFactory.CopyExpr(a.expr)
	if !a.IsChecked() {
		return NewAST(e, CopySourceInfo(a.SourceInfo()))
	}
	typesCopy := make(map[int64]*types.Type, len(a.typeMap))
	for id, t := range a.typeMap {
		typesCopy[id] = t
	}
	refsCopy := make(map[int64]*ReferenceInfo, len(a.refMap))
	for id, r := range a.refMap {
		refsCopy[id] = r
	}
	return NewCheckedAST(NewAST(e, CopySourceInfo(a.SourceInfo())), typesCopy, refsCopy)
}

// MaxID returns the upper-bound, non-inclusive, of ids present within the AST's Expr value.
func MaxID(a *AST) int64 {