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Merge pull request #131 from skotambkar/xml/Deser
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| package xml | ||
|
|
||
| import ( | ||
| "encoding/xml" | ||
| "fmt" | ||
| ) | ||
|
|
||
| // NodeDecoder is a XML decoder wrapper that is responsible to decoding | ||
| // a single XML Node element and it's nested member elements. This wrapper decoder | ||
| // takes in the start element of the top level node being decoded. | ||
| type NodeDecoder struct { | ||
| Decoder *xml.Decoder | ||
| StartEl xml.StartElement | ||
| } | ||
|
|
||
| // WrapNodeDecoder returns an initialized XMLNodeDecoder | ||
| func WrapNodeDecoder(decoder *xml.Decoder, startEl xml.StartElement) NodeDecoder { | ||
| return NodeDecoder{ | ||
| Decoder: decoder, | ||
| StartEl: startEl, | ||
| } | ||
| } | ||
|
|
||
| // Token on a Node Decoder returns a xml StartElement. It returns a boolean that indicates the | ||
| // a token is the node decoder's end node token; and an error which indicates any error | ||
| // that occurred while retrieving the start element | ||
| func (d NodeDecoder) Token() (t xml.StartElement, done bool, err error) { | ||
| for { | ||
| token, e := d.Decoder.Token() | ||
| if e != nil { | ||
| return t, done, e | ||
| } | ||
|
|
||
| // check if we reach end of the node being decoded | ||
| if el, ok := token.(xml.EndElement); ok { | ||
| return t, el == d.StartEl.End(), err | ||
| } | ||
|
|
||
| if t, ok := token.(xml.StartElement); ok { | ||
| return t, false, err | ||
| } | ||
|
|
||
| // skip token if it is a comment or preamble or empty space value due to indentation | ||
| // or if it's a value and is not expected | ||
| } | ||
|
|
||
| return | ||
| } | ||
|
|
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| // Value provides an abstraction to retrieve char data value within an xml element. | ||
| // The method will return an error if it encounters a nested xml element instead of char data. | ||
| // This method should only be used to retrieve simple type or blob shape values as []byte. | ||
| func (d NodeDecoder) Value() (c []byte, done bool, err error) { | ||
| t, e := d.Decoder.Token() | ||
| if e != nil { | ||
| return c, done, e | ||
| } | ||
|
|
||
| // check if token is of type charData | ||
| if ev, ok := t.(xml.CharData); ok { | ||
| return ev, done, err | ||
| } | ||
|
|
||
| if ev, ok := t.(xml.EndElement); ok { | ||
| if ev == d.StartEl.End() { | ||
| return c, true, err | ||
| } | ||
| } | ||
|
|
||
| return c, done, fmt.Errorf("expected value for %v element, got %T type %v instead", d.StartEl.Name.Local, t, t) | ||
| } | ||
|
|
||
| // FetchRootElement takes in a decoder and returns the first start element within the xml body. | ||
| // This function is useful in fetching the start element of an XML response and ignore the | ||
| // comments and preamble | ||
| func FetchRootElement(decoder *xml.Decoder) (startElement xml.StartElement, err error) { | ||
| for { | ||
| t, e := decoder.Token() | ||
| if e != nil { | ||
| return startElement, e | ||
| } | ||
|
|
||
| if startElement, ok := t.(xml.StartElement); ok { | ||
| return startElement, err | ||
| } | ||
| } | ||
| } |
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