/
help.go
178 lines (160 loc) · 2.88 KB
/
help.go
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package sexp
func DontPanic(f func() error) (err error) {
defer func() {
if e := recover(); e != nil {
if ue, ok := e.(*UnmarshalError); ok {
err = ue
return
}
panic(e)
}
}()
return f()
}
// A simple helper structure inspired by the simplejson-go API. Use Help
// function to actually acquire it from the given *Node.
type Helper struct {
node *Node
err *UnmarshalError
}
func Help(node *Node) Helper {
if node == nil {
err := NewUnmarshalError(nil, nil, "nil node")
return Helper{nil, err}
}
return Helper{node, nil}
}
func (h Helper) IsValid() bool {
return h.node != nil
}
func (h Helper) Next() Helper {
if h.node == nil {
return h
}
if h.node.Next == nil {
err := NewUnmarshalError(h.node, nil,
"a sibling of the node was requested, but it has none")
return Helper{nil, err}
}
return Helper{h.node.Next, nil}
}
func (h Helper) Child(n int) Helper {
if h.node == nil {
return h
}
c := h.node.Children
if c == nil {
err := NewUnmarshalError(h.node, nil,
"cannot retrieve %d%s child node, node is not a list",
n+1, number_suffix(n+1))
return Helper{nil, err}
}
for i := 0; i < n; i++ {
c = c.Next
if c == nil {
err := NewUnmarshalError(h.node, nil,
"cannot retrieve %d%s child node, %s",
n+1, number_suffix(n+1),
the_list_has_n_children(h.node.NumChildren()))
return Helper{nil, err}
}
}
return Helper{c, nil}
}
func (h Helper) IsList() bool {
if h.node == nil {
return false
}
return h.node.IsList()
}
func (h Helper) IsScalar() bool {
if h.node == nil {
return false
}
return h.node.IsScalar()
}
func (h Helper) Bool() (bool, error) {
if h.node == nil {
return false, h.err
}
var v bool
err := h.node.Unmarshal(&v)
if err != nil {
return false, err
}
return v, nil
}
func (h Helper) Int() (int, error) {
if h.node == nil {
return 0, h.err
}
var v int
err := h.node.Unmarshal(&v)
if err != nil {
return 0, err
}
return v, nil
}
func (h Helper) Float64() (float64, error) {
if h.node == nil {
return 0, h.err
}
var v float64
err := h.node.Unmarshal(&v)
if err != nil {
return 0, err
}
return v, nil
}
func (h Helper) String() (string, error) {
if h.node == nil {
return "", h.err
}
var v string
err := h.node.Unmarshal(&v)
if err != nil {
return "", err
}
return v, nil
}
func (h Helper) Node() (*Node, error) {
if h.node == nil {
return nil, h.err
}
return h.node, nil
}
func (h Helper) MustBool() bool {
v, err := h.Bool()
if err != nil {
panic(err)
}
return v
}
func (h Helper) MustInt() int {
v, err := h.Int()
if err != nil {
panic(err)
}
return v
}
func (h Helper) MustFloat64() float64 {
v, err := h.Float64()
if err != nil {
panic(err)
}
return v
}
func (h Helper) MustString() string {
v, err := h.String()
if err != nil {
panic(err)
}
return v
}
func (h Helper) MustNode() *Node {
v, err := h.Node()
if err != nil {
panic(err)
}
return v
}