Esempio n. 1
0
func (v *evalVisitor) Visit(root ast.Node) (interface{}, ast.Type, error) {
	// Run the actual visitor pattern
	root.Accept(v.visit)

	// Get our result and clear out everything else
	var result *ast.LiteralNode
	if v.Stack.Len() > 0 {
		result = v.Stack.Pop().(*ast.LiteralNode)
	} else {
		result = new(ast.LiteralNode)
	}
	resultErr := v.err
	if resultErr == errExitUnknown {
		// This means the return value is unknown and we used the error
		// as an early exit mechanism. Reset since the value on the stack
		// should be the unknown value.
		resultErr = nil
	}

	// Clear everything else so we aren't just dangling
	v.Stack.Reset()
	v.err = nil

	t, err := result.Type(v.Scope)
	if err != nil {
		return nil, ast.TypeInvalid, err
	}

	return result.Value, t, resultErr
}
Esempio n. 2
0
func (v *evalVisitor) Visit(root ast.Node) (interface{}, ast.Type, error) {
	// Run the actual visitor pattern
	root.Accept(v.visit)

	// Get our result and clear out everything else
	var result *ast.LiteralNode
	if v.Stack.Len() > 0 {
		result = v.Stack.Pop().(*ast.LiteralNode)
	} else {
		result = new(ast.LiteralNode)
	}
	resultErr := v.err

	// Clear everything else so we aren't just dangling
	v.Stack.Reset()
	v.err = nil

	t, err := result.Type(v.Scope)
	if err != nil {
		return nil, ast.TypeInvalid, err
	}

	return result.Value, t, resultErr
}