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xml: handle non-string attribute fields
R=kevlar, rsc CC=golang-dev https://golang.org/cl/4528114
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@ -106,6 +106,11 @@ import (
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// The struct field may have type []byte or string.
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// If there is no such field, the character data is discarded.
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//
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// * If the XML element contains comments, they are accumulated in
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// the first struct field that has tag "comments". The struct
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// field may have type []byte or string. If there is no such
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// field, the comments are discarded.
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//
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// * If the XML element contains a sub-element whose name matches
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// the prefix of a struct field tag formatted as "a>b>c", unmarshal
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// will descend into the XML structure looking for elements with the
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@ -120,17 +125,22 @@ import (
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// maps the sub-element to that struct field.
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//
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// Unmarshal maps an XML element to a string or []byte by saving the
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// concatenation of that element's character data in the string or []byte.
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// concatenation of that element's character data in the string or
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// []byte.
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//
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// Unmarshal maps an XML element to a slice by extending the length
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// of the slice and mapping the element to the newly created value.
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// Unmarshal maps an attribute value to a string or []byte by saving
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// the value in the string or slice.
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//
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// Unmarshal maps an XML element to a bool by setting it to the boolean
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// value represented by the string.
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// Unmarshal maps an XML element to a slice by extending the length of
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// the slice and mapping the element to the newly created value.
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//
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// Unmarshal maps an XML element to an integer or floating-point
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// field by setting the field to the result of interpreting the string
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// value in decimal. There is no check for overflow.
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// Unmarshal maps an XML element or attribute value to a bool by
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// setting it to the boolean value represented by the string.
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//
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// Unmarshal maps an XML element or attribute value to an integer or
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// floating-point field by setting the field to the result of
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// interpreting the string value in decimal. There is no check for
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// overflow.
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//
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// Unmarshal maps an XML element to an xml.Name by recording the
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// element name.
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@ -323,9 +333,6 @@ func (p *Parser) unmarshal(val reflect.Value, start *StartElement) os.Error {
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switch f.Tag {
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case "attr":
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strv := sv.FieldByIndex(f.Index)
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if strv.Kind() != reflect.String {
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return UnmarshalError(sv.Type().String() + " field " + f.Name + " has attr tag but is not type string")
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}
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// Look for attribute.
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val := ""
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k := strings.ToLower(f.Name)
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@ -335,7 +342,7 @@ func (p *Parser) unmarshal(val reflect.Value, start *StartElement) os.Error {
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break
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}
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}
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strv.SetString(val)
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copyValue(strv, []byte(val))
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case "comment":
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if !saveComment.IsValid() {
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@ -454,29 +461,50 @@ Loop:
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}
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}
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var err os.Error
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if err := copyValue(saveData, data); err != nil {
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return err
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}
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switch t := saveComment; t.Kind() {
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case reflect.String:
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t.SetString(string(comment))
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case reflect.Slice:
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t.Set(reflect.ValueOf(comment))
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}
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switch t := saveXML; t.Kind() {
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case reflect.String:
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t.SetString(string(saveXMLData))
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case reflect.Slice:
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t.Set(reflect.ValueOf(saveXMLData))
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}
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return nil
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}
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func copyValue(dst reflect.Value, src []byte) (err os.Error) {
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// Helper functions for integer and unsigned integer conversions
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var itmp int64
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getInt64 := func() bool {
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itmp, err = strconv.Atoi64(string(data))
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itmp, err = strconv.Atoi64(string(src))
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// TODO: should check sizes
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return err == nil
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}
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var utmp uint64
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getUint64 := func() bool {
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utmp, err = strconv.Atoui64(string(data))
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utmp, err = strconv.Atoui64(string(src))
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// TODO: check for overflow?
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return err == nil
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}
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var ftmp float64
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getFloat64 := func() bool {
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ftmp, err = strconv.Atof64(string(data))
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ftmp, err = strconv.Atof64(string(src))
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// TODO: check for overflow?
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return err == nil
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}
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// Save accumulated data and comments
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switch t := saveData; t.Kind() {
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switch t := dst; t.Kind() {
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case reflect.Invalid:
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// Probably a comment, handled below
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default:
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@ -497,31 +525,16 @@ Loop:
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}
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t.SetFloat(ftmp)
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case reflect.Bool:
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value, err := strconv.Atob(strings.TrimSpace(string(data)))
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value, err := strconv.Atob(strings.TrimSpace(string(src)))
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if err != nil {
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return err
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}
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t.SetBool(value)
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case reflect.String:
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t.SetString(string(data))
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t.SetString(string(src))
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case reflect.Slice:
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t.Set(reflect.ValueOf(data))
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t.Set(reflect.ValueOf(src))
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}
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switch t := saveComment; t.Kind() {
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case reflect.String:
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t.SetString(string(comment))
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case reflect.Slice:
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t.Set(reflect.ValueOf(comment))
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}
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switch t := saveXML; t.Kind() {
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case reflect.String:
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t.SetString(string(saveXMLData))
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case reflect.Slice:
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t.Set(reflect.ValueOf(saveXMLData))
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}
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return nil
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}
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@ -325,3 +325,47 @@ func TestUnmarshalBadPaths(t *testing.T) {
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}
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}
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}
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func TestUnmarshalAttrs(t *testing.T) {
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var f AttrTest
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if err := Unmarshal(StringReader(attrString), &f); err != nil {
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t.Fatalf("Unmarshal: %s", err)
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}
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if !reflect.DeepEqual(f, attrStruct) {
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t.Fatalf("have %#v\nwant %#v", f, attrStruct)
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}
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}
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type AttrTest struct {
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Test1 Test1
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Test2 Test2
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}
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type Test1 struct {
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Int int "attr"
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Float float64 "attr"
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Uint8 uint8 "attr"
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}
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type Test2 struct {
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Bool bool "attr"
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}
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const attrString = `
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<?xml version="1.0" charset="utf-8"?>
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<attrtest>
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<test1 int="8" float="23.5" uint8="255"/>
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<test2 bool="true"/>
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</attrtest>
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`
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var attrStruct = AttrTest{
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Test1: Test1{
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Int: 8,
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Float: 23.5,
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Uint8: 255,
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},
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Test2: Test2{
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Bool: true,
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},
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}
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