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marshal.go
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marshal.go
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package fincen
import (
"bufio"
"bytes"
"encoding"
"encoding/xml"
"fmt"
"io"
"reflect"
"strconv"
"strings"
"sync"
"unicode"
"unicode/utf8"
)
var (
escQuot = []byte(""") // shorter than """
escApos = []byte("'") // shorter than "'"
escAmp = []byte("&")
escLT = []byte("<")
escGT = []byte(">")
escTab = []byte("	")
escNL = []byte("
")
escCR = []byte("
")
escFFFD = []byte("\uFFFD") // Unicode replacement character
attrType = reflect.TypeOf(xml.Attr{})
marshalerType = reflect.TypeOf((*xml.Marshaler)(nil)).Elem()
marshalerAttrType = reflect.TypeOf((*xml.MarshalerAttr)(nil)).Elem()
textMarshalerType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
cdataStart = []byte("<![CDATA[")
cdataEnd = []byte("]]>")
cdataEscape = []byte("]]]]><![CDATA[>")
ddBytes = []byte("--")
tinfoMap sync.Map
nameType = reflect.TypeOf(xml.Name{})
)
type fieldFlags int
var first = &unicode.RangeTable{
R16: []unicode.Range16{
{0x003A, 0x003A, 1},
{0x0041, 0x005A, 1},
{0x005F, 0x005F, 1},
{0x0061, 0x007A, 1},
{0x00C0, 0x00D6, 1},
{0x00D8, 0x00F6, 1},
{0x00F8, 0x00FF, 1},
{0x0100, 0x0131, 1},
{0x0134, 0x013E, 1},
{0x0141, 0x0148, 1},
{0x014A, 0x017E, 1},
{0x0180, 0x01C3, 1},
{0x01CD, 0x01F0, 1},
{0x01F4, 0x01F5, 1},
{0x01FA, 0x0217, 1},
{0x0250, 0x02A8, 1},
{0x02BB, 0x02C1, 1},
{0x0386, 0x0386, 1},
{0x0388, 0x038A, 1},
{0x038C, 0x038C, 1},
{0x038E, 0x03A1, 1},
{0x03A3, 0x03CE, 1},
{0x03D0, 0x03D6, 1},
{0x03DA, 0x03E0, 2},
{0x03E2, 0x03F3, 1},
{0x0401, 0x040C, 1},
{0x040E, 0x044F, 1},
{0x0451, 0x045C, 1},
{0x045E, 0x0481, 1},
{0x0490, 0x04C4, 1},
{0x04C7, 0x04C8, 1},
{0x04CB, 0x04CC, 1},
{0x04D0, 0x04EB, 1},
{0x04EE, 0x04F5, 1},
{0x04F8, 0x04F9, 1},
{0x0531, 0x0556, 1},
{0x0559, 0x0559, 1},
{0x0561, 0x0586, 1},
{0x05D0, 0x05EA, 1},
{0x05F0, 0x05F2, 1},
{0x0621, 0x063A, 1},
{0x0641, 0x064A, 1},
{0x0671, 0x06B7, 1},
{0x06BA, 0x06BE, 1},
{0x06C0, 0x06CE, 1},
{0x06D0, 0x06D3, 1},
{0x06D5, 0x06D5, 1},
{0x06E5, 0x06E6, 1},
{0x0905, 0x0939, 1},
{0x093D, 0x093D, 1},
{0x0958, 0x0961, 1},
{0x0985, 0x098C, 1},
{0x098F, 0x0990, 1},
{0x0993, 0x09A8, 1},
{0x09AA, 0x09B0, 1},
{0x09B2, 0x09B2, 1},
{0x09B6, 0x09B9, 1},
{0x09DC, 0x09DD, 1},
{0x09DF, 0x09E1, 1},
{0x09F0, 0x09F1, 1},
{0x0A05, 0x0A0A, 1},
{0x0A0F, 0x0A10, 1},
{0x0A13, 0x0A28, 1},
{0x0A2A, 0x0A30, 1},
{0x0A32, 0x0A33, 1},
{0x0A35, 0x0A36, 1},
{0x0A38, 0x0A39, 1},
{0x0A59, 0x0A5C, 1},
{0x0A5E, 0x0A5E, 1},
{0x0A72, 0x0A74, 1},
{0x0A85, 0x0A8B, 1},
{0x0A8D, 0x0A8D, 1},
{0x0A8F, 0x0A91, 1},
{0x0A93, 0x0AA8, 1},
{0x0AAA, 0x0AB0, 1},
{0x0AB2, 0x0AB3, 1},
{0x0AB5, 0x0AB9, 1},
{0x0ABD, 0x0AE0, 0x23},
{0x0B05, 0x0B0C, 1},
{0x0B0F, 0x0B10, 1},
{0x0B13, 0x0B28, 1},
{0x0B2A, 0x0B30, 1},
{0x0B32, 0x0B33, 1},
{0x0B36, 0x0B39, 1},
{0x0B3D, 0x0B3D, 1},
{0x0B5C, 0x0B5D, 1},
{0x0B5F, 0x0B61, 1},
{0x0B85, 0x0B8A, 1},
{0x0B8E, 0x0B90, 1},
{0x0B92, 0x0B95, 1},
{0x0B99, 0x0B9A, 1},
{0x0B9C, 0x0B9C, 1},
{0x0B9E, 0x0B9F, 1},
{0x0BA3, 0x0BA4, 1},
{0x0BA8, 0x0BAA, 1},
{0x0BAE, 0x0BB5, 1},
{0x0BB7, 0x0BB9, 1},
{0x0C05, 0x0C0C, 1},
{0x0C0E, 0x0C10, 1},
{0x0C12, 0x0C28, 1},
{0x0C2A, 0x0C33, 1},
{0x0C35, 0x0C39, 1},
{0x0C60, 0x0C61, 1},
{0x0C85, 0x0C8C, 1},
{0x0C8E, 0x0C90, 1},
{0x0C92, 0x0CA8, 1},
{0x0CAA, 0x0CB3, 1},
{0x0CB5, 0x0CB9, 1},
{0x0CDE, 0x0CDE, 1},
{0x0CE0, 0x0CE1, 1},
{0x0D05, 0x0D0C, 1},
{0x0D0E, 0x0D10, 1},
{0x0D12, 0x0D28, 1},
{0x0D2A, 0x0D39, 1},
{0x0D60, 0x0D61, 1},
{0x0E01, 0x0E2E, 1},
{0x0E30, 0x0E30, 1},
{0x0E32, 0x0E33, 1},
{0x0E40, 0x0E45, 1},
{0x0E81, 0x0E82, 1},
{0x0E84, 0x0E84, 1},
{0x0E87, 0x0E88, 1},
{0x0E8A, 0x0E8D, 3},
{0x0E94, 0x0E97, 1},
{0x0E99, 0x0E9F, 1},
{0x0EA1, 0x0EA3, 1},
{0x0EA5, 0x0EA7, 2},
{0x0EAA, 0x0EAB, 1},
{0x0EAD, 0x0EAE, 1},
{0x0EB0, 0x0EB0, 1},
{0x0EB2, 0x0EB3, 1},
{0x0EBD, 0x0EBD, 1},
{0x0EC0, 0x0EC4, 1},
{0x0F40, 0x0F47, 1},
{0x0F49, 0x0F69, 1},
{0x10A0, 0x10C5, 1},
{0x10D0, 0x10F6, 1},
{0x1100, 0x1100, 1},
{0x1102, 0x1103, 1},
{0x1105, 0x1107, 1},
{0x1109, 0x1109, 1},
{0x110B, 0x110C, 1},
{0x110E, 0x1112, 1},
{0x113C, 0x1140, 2},
{0x114C, 0x1150, 2},
{0x1154, 0x1155, 1},
{0x1159, 0x1159, 1},
{0x115F, 0x1161, 1},
{0x1163, 0x1169, 2},
{0x116D, 0x116E, 1},
{0x1172, 0x1173, 1},
{0x1175, 0x119E, 0x119E - 0x1175},
{0x11A8, 0x11AB, 0x11AB - 0x11A8},
{0x11AE, 0x11AF, 1},
{0x11B7, 0x11B8, 1},
{0x11BA, 0x11BA, 1},
{0x11BC, 0x11C2, 1},
{0x11EB, 0x11F0, 0x11F0 - 0x11EB},
{0x11F9, 0x11F9, 1},
{0x1E00, 0x1E9B, 1},
{0x1EA0, 0x1EF9, 1},
{0x1F00, 0x1F15, 1},
{0x1F18, 0x1F1D, 1},
{0x1F20, 0x1F45, 1},
{0x1F48, 0x1F4D, 1},
{0x1F50, 0x1F57, 1},
{0x1F59, 0x1F5B, 0x1F5B - 0x1F59},
{0x1F5D, 0x1F5D, 1},
{0x1F5F, 0x1F7D, 1},
{0x1F80, 0x1FB4, 1},
{0x1FB6, 0x1FBC, 1},
{0x1FBE, 0x1FBE, 1},
{0x1FC2, 0x1FC4, 1},
{0x1FC6, 0x1FCC, 1},
{0x1FD0, 0x1FD3, 1},
{0x1FD6, 0x1FDB, 1},
{0x1FE0, 0x1FEC, 1},
{0x1FF2, 0x1FF4, 1},
{0x1FF6, 0x1FFC, 1},
{0x2126, 0x2126, 1},
{0x212A, 0x212B, 1},
{0x212E, 0x212E, 1},
{0x2180, 0x2182, 1},
{0x3007, 0x3007, 1},
{0x3021, 0x3029, 1},
{0x3041, 0x3094, 1},
{0x30A1, 0x30FA, 1},
{0x3105, 0x312C, 1},
{0x4E00, 0x9FA5, 1},
{0xAC00, 0xD7A3, 1},
},
}
var second = &unicode.RangeTable{
R16: []unicode.Range16{
{0x002D, 0x002E, 1},
{0x0030, 0x0039, 1},
{0x00B7, 0x00B7, 1},
{0x02D0, 0x02D1, 1},
{0x0300, 0x0345, 1},
{0x0360, 0x0361, 1},
{0x0387, 0x0387, 1},
{0x0483, 0x0486, 1},
{0x0591, 0x05A1, 1},
{0x05A3, 0x05B9, 1},
{0x05BB, 0x05BD, 1},
{0x05BF, 0x05BF, 1},
{0x05C1, 0x05C2, 1},
{0x05C4, 0x0640, 0x0640 - 0x05C4},
{0x064B, 0x0652, 1},
{0x0660, 0x0669, 1},
{0x0670, 0x0670, 1},
{0x06D6, 0x06DC, 1},
{0x06DD, 0x06DF, 1},
{0x06E0, 0x06E4, 1},
{0x06E7, 0x06E8, 1},
{0x06EA, 0x06ED, 1},
{0x06F0, 0x06F9, 1},
{0x0901, 0x0903, 1},
{0x093C, 0x093C, 1},
{0x093E, 0x094C, 1},
{0x094D, 0x094D, 1},
{0x0951, 0x0954, 1},
{0x0962, 0x0963, 1},
{0x0966, 0x096F, 1},
{0x0981, 0x0983, 1},
{0x09BC, 0x09BC, 1},
{0x09BE, 0x09BF, 1},
{0x09C0, 0x09C4, 1},
{0x09C7, 0x09C8, 1},
{0x09CB, 0x09CD, 1},
{0x09D7, 0x09D7, 1},
{0x09E2, 0x09E3, 1},
{0x09E6, 0x09EF, 1},
{0x0A02, 0x0A3C, 0x3A},
{0x0A3E, 0x0A3F, 1},
{0x0A40, 0x0A42, 1},
{0x0A47, 0x0A48, 1},
{0x0A4B, 0x0A4D, 1},
{0x0A66, 0x0A6F, 1},
{0x0A70, 0x0A71, 1},
{0x0A81, 0x0A83, 1},
{0x0ABC, 0x0ABC, 1},
{0x0ABE, 0x0AC5, 1},
{0x0AC7, 0x0AC9, 1},
{0x0ACB, 0x0ACD, 1},
{0x0AE6, 0x0AEF, 1},
{0x0B01, 0x0B03, 1},
{0x0B3C, 0x0B3C, 1},
{0x0B3E, 0x0B43, 1},
{0x0B47, 0x0B48, 1},
{0x0B4B, 0x0B4D, 1},
{0x0B56, 0x0B57, 1},
{0x0B66, 0x0B6F, 1},
{0x0B82, 0x0B83, 1},
{0x0BBE, 0x0BC2, 1},
{0x0BC6, 0x0BC8, 1},
{0x0BCA, 0x0BCD, 1},
{0x0BD7, 0x0BD7, 1},
{0x0BE7, 0x0BEF, 1},
{0x0C01, 0x0C03, 1},
{0x0C3E, 0x0C44, 1},
{0x0C46, 0x0C48, 1},
{0x0C4A, 0x0C4D, 1},
{0x0C55, 0x0C56, 1},
{0x0C66, 0x0C6F, 1},
{0x0C82, 0x0C83, 1},
{0x0CBE, 0x0CC4, 1},
{0x0CC6, 0x0CC8, 1},
{0x0CCA, 0x0CCD, 1},
{0x0CD5, 0x0CD6, 1},
{0x0CE6, 0x0CEF, 1},
{0x0D02, 0x0D03, 1},
{0x0D3E, 0x0D43, 1},
{0x0D46, 0x0D48, 1},
{0x0D4A, 0x0D4D, 1},
{0x0D57, 0x0D57, 1},
{0x0D66, 0x0D6F, 1},
{0x0E31, 0x0E31, 1},
{0x0E34, 0x0E3A, 1},
{0x0E46, 0x0E46, 1},
{0x0E47, 0x0E4E, 1},
{0x0E50, 0x0E59, 1},
{0x0EB1, 0x0EB1, 1},
{0x0EB4, 0x0EB9, 1},
{0x0EBB, 0x0EBC, 1},
{0x0EC6, 0x0EC6, 1},
{0x0EC8, 0x0ECD, 1},
{0x0ED0, 0x0ED9, 1},
{0x0F18, 0x0F19, 1},
{0x0F20, 0x0F29, 1},
{0x0F35, 0x0F39, 2},
{0x0F3E, 0x0F3F, 1},
{0x0F71, 0x0F84, 1},
{0x0F86, 0x0F8B, 1},
{0x0F90, 0x0F95, 1},
{0x0F97, 0x0F97, 1},
{0x0F99, 0x0FAD, 1},
{0x0FB1, 0x0FB7, 1},
{0x0FB9, 0x0FB9, 1},
{0x20D0, 0x20DC, 1},
{0x20E1, 0x3005, 0x3005 - 0x20E1},
{0x302A, 0x302F, 1},
{0x3031, 0x3035, 1},
{0x3099, 0x309A, 1},
{0x309D, 0x309E, 1},
{0x30FC, 0x30FE, 1},
},
}
const (
fElement fieldFlags = 1 << iota
fAttr
fCDATA
fCharData
fInnerXML
fComment
fAny
fOmitEmpty
fMode = fElement | fAttr | fCDATA | fCharData | fInnerXML | fComment | fAny
xmlName = "XMLName"
xmlURL = "http://www.w3.org/XML/1998/namespace"
xmlPrefix = "xml"
dontInitNilPointers = false
)
// typeInfo holds details for the xml representation of a type.
type typeInfo struct {
xmlname *fieldInfo
fields []fieldInfo
}
// fieldInfo holds details for the xml representation of a single field.
type fieldInfo struct {
idx []int
name string
xmlns string
flags fieldFlags
parents []string
}
type marshaler interface {
MarshalXML(e *encoder, start xml.StartElement) error
}
// Marshal will return an error if asked to marshal a channel, function, or map.
func Marshal(v any) ([]byte, error) {
var b bytes.Buffer
if err := newEncoder(&b).Encode(v); err != nil {
return nil, err
}
return b.Bytes(), nil
}
// MarshalIndent works like Marshal, but each XML element begins on a new
// indented line that starts with prefix and is followed by one or more
// copies of indent according to the nesting depth.
func MarshalIndent(v any, prefix, indent string) ([]byte, error) {
var b bytes.Buffer
enc := newEncoder(&b)
enc.Indent(prefix, indent)
if err := enc.Encode(v); err != nil {
return nil, err
}
return b.Bytes(), nil
}
// NewEncoder returns a new encoder that writes to w.
func newEncoder(w io.Writer) *encoder {
e := &encoder{printer{Writer: bufio.NewWriter(w)}}
e.p.encoder = e
return e
}
// An Encoder writes XML data to an output stream.
type encoder struct {
p printer
}
// Indent sets the encoder to generate XML in which each element
// begins on a new indented line that starts with prefix and is followed by
// one or more copies of indent according to the nesting depth.
func (enc *encoder) Indent(prefix, indent string) {
enc.p.prefix = prefix
enc.p.indent = indent
}
// Encode writes the XML encoding of v to the stream.
//
// See the documentation for Marshal for details about the conversion
// of Go values to XML.
//
// Encode calls Flush before returning.
func (enc *encoder) Encode(v any) error {
err := enc.p.marshalValue(reflect.ValueOf(v), nil, nil)
if err != nil {
return err
}
return enc.p.Flush()
}
// EncodeElement writes the XML encoding of v to the stream,
// using start as the outermost tag in the encoding.
//
// See the documentation for Marshal for details about the conversion
// of Go values to XML.
//
// EncodeElement calls Flush before returning.
func (enc *encoder) EncodeElement(v any, start xml.StartElement) error {
err := enc.p.marshalValue(reflect.ValueOf(v), nil, &start)
if err != nil {
return err
}
return enc.p.Flush()
}
// Flush flushes any buffered XML to the underlying writer.
// See the EncodeToken documentation for details about when it is necessary.
func (enc *encoder) Flush() error {
return enc.p.Flush()
}
type printer struct {
*bufio.Writer
encoder *encoder
seq int
indent string
prefix string
depth int
indentedIn bool
putNewline bool
attrNS map[string]string // map prefix -> name space
attrPrefix map[string]string // map name space -> prefix
prefixes []string
tags []xml.Name
}
// createAttrPrefix finds the name space prefix attribute to use for the given name space,
// defining a new prefix if necessary. It returns the prefix.
func (p *printer) createAttrPrefix(url string) string {
if prefix := p.attrPrefix[url]; prefix != "" {
return prefix
}
// The "http://www.w3.org/XML/1998/namespace" name space is predefined as "xml"
// and must be referred to that way.
// (The "http://www.w3.org/2000/xmlns/" name space is also predefined as "xmlns",
// but users should not be trying to use that one directly - that's our job.)
if url == xmlURL {
return xmlPrefix
}
// Need to define a new name space.
if p.attrPrefix == nil {
p.attrPrefix = make(map[string]string)
p.attrNS = make(map[string]string)
}
// Pick a name. We try to use the final element of the path
// but fall back to _.
prefix := strings.TrimRight(url, "/")
if i := strings.LastIndex(prefix, "/"); i >= 0 {
prefix = prefix[i+1:]
}
if prefix == "" || !isName([]byte(prefix)) || strings.Contains(prefix, ":") {
prefix = "_"
}
// xmlanything is reserved and any variant of it regardless of
// case should be matched, so:
// (('X'|'x') ('M'|'m') ('L'|'l'))
// See Section 2.3 of https://www.w3.org/TR/REC-xml/
if len(prefix) >= 3 && strings.EqualFold(prefix[:3], "xml") {
prefix = "_" + prefix
}
if p.attrNS[prefix] != "" {
// Name is taken. Find a better one.
for p.seq++; ; p.seq++ {
if id := prefix + "_" + strconv.Itoa(p.seq); p.attrNS[id] == "" {
prefix = id
break
}
}
}
p.attrPrefix[url] = prefix
p.attrNS[prefix] = url
p.WriteString(`xmlns:`)
p.WriteString(prefix)
p.WriteString(`="`)
xml.EscapeText(p, []byte(url))
p.WriteString(`" `)
p.prefixes = append(p.prefixes, prefix)
return prefix
}
// deleteAttrPrefix removes an attribute name space prefix.
func (p *printer) deleteAttrPrefix(prefix string) {
delete(p.attrPrefix, p.attrNS[prefix])
delete(p.attrNS, prefix)
}
func (p *printer) markPrefix() {
p.prefixes = append(p.prefixes, "")
}
func (p *printer) popPrefix() {
for len(p.prefixes) > 0 {
prefix := p.prefixes[len(p.prefixes)-1]
p.prefixes = p.prefixes[:len(p.prefixes)-1]
if prefix == "" {
break
}
p.deleteAttrPrefix(prefix)
}
}
// marshalValue writes one or more XML elements representing val.
// If val was obtained from a struct field, finfo must have its details.
func (p *printer) marshalValue(val reflect.Value, finfo *fieldInfo, startTemplate *xml.StartElement) error {
if startTemplate != nil && startTemplate.Name.Local == "" {
return fmt.Errorf("xml: EncodeElement of StartElement with missing name")
}
if !val.IsValid() {
return nil
}
if finfo != nil && finfo.flags&fOmitEmpty != 0 && isEmptyValue(val) {
return nil
}
// Drill into interfaces and pointers.
// This can turn into an infinite loop given a cyclic chain,
// but it matches the Go 1 behavior.
for val.Kind() == reflect.Interface || val.Kind() == reflect.Pointer {
if val.IsNil() {
return nil
}
val = val.Elem()
}
kind := val.Kind()
typ := val.Type()
// Check for marshaler.
if val.CanInterface() && typ.Implements(marshalerType) {
return p.marshalInterface(val.Interface().(marshaler), defaultStart(typ, finfo, startTemplate))
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(marshalerType) {
return p.marshalInterface(pv.Interface().(marshaler), defaultStart(pv.Type(), finfo, startTemplate))
}
}
// Check for text marshaler.
if val.CanInterface() && typ.Implements(textMarshalerType) {
return p.marshalTextInterface(val.Interface().(encoding.TextMarshaler), defaultStart(typ, finfo, startTemplate))
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(textMarshalerType) {
return p.marshalTextInterface(pv.Interface().(encoding.TextMarshaler), defaultStart(pv.Type(), finfo, startTemplate))
}
}
// Slices and arrays iterate over the elements. They do not have an enclosing tag.
if (kind == reflect.Slice || kind == reflect.Array) && typ.Elem().Kind() != reflect.Uint8 {
for i, n := 0, val.Len(); i < n; i++ {
if err := p.marshalValue(val.Index(i), finfo, startTemplate); err != nil {
return err
}
}
return nil
}
tinfo, err := getTypeInfo(typ)
if err != nil {
return err
}
// Create start element.
// Precedence for the XML element name is:
// 0. startTemplate
// 1. XMLName field in underlying struct;
// 2. field name/tag in the struct field; and
// 3. type name
var start xml.StartElement
if startTemplate != nil {
start.Name = startTemplate.Name
start.Attr = append(start.Attr, startTemplate.Attr...)
} else if tinfo.xmlname != nil {
xmlname := tinfo.xmlname
if xmlname.name != "" {
start.Name.Space, start.Name.Local = xmlname.xmlns, xmlname.name
} else {
fv := xmlname.value(val, dontInitNilPointers)
if v, ok := fv.Interface().(xml.Name); ok && v.Local != "" {
start.Name = v
}
}
}
if start.Name.Local == "" && finfo != nil {
start.Name.Space, start.Name.Local = finfo.xmlns, finfo.name
}
if start.Name.Local == "" {
name := typ.Name()
if i := strings.IndexByte(name, '['); i >= 0 {
// Truncate generic instantiation name. See issue 48318.
name = name[:i]
}
if name == "" {
return &xml.UnsupportedTypeError{Type: typ}
}
start.Name.Local = name
}
// Attributes
for i := range tinfo.fields {
finfo := &tinfo.fields[i]
if finfo.flags&fAttr == 0 {
continue
}
fv := finfo.value(val, dontInitNilPointers)
if finfo.flags&fOmitEmpty != 0 && (!fv.IsValid() || isEmptyValue(fv)) {
continue
}
if fv.Kind() == reflect.Interface && fv.IsNil() {
continue
}
name := xml.Name{Space: finfo.xmlns, Local: finfo.name}
if err := p.marshalAttr(&start, name, fv); err != nil {
return err
}
}
if err := p.writeStart(&start); err != nil {
return err
}
if val.Kind() == reflect.Struct {
err = p.marshalStruct(tinfo, val)
} else {
s, b, err1 := p.marshalSimple(typ, val)
if err1 != nil {
err = err1
} else if b != nil {
xml.EscapeText(p, b)
} else {
p.EscapeString(s)
}
}
if err != nil {
return err
}
if err := p.writeEnd(start.Name); err != nil {
return err
}
return p.cachedWriteError()
}
// marshalAttr marshals an attribute with the given name and value, adding to start.Attr.
func (p *printer) marshalAttr(start *xml.StartElement, name xml.Name, val reflect.Value) error {
if val.CanInterface() && val.Type().Implements(marshalerAttrType) {
attr, err := val.Interface().(xml.MarshalerAttr).MarshalXMLAttr(name)
if err != nil {
return err
}
if attr.Name.Local != "" {
start.Attr = append(start.Attr, attr)
}
return nil
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(marshalerAttrType) {
attr, err := pv.Interface().(xml.MarshalerAttr).MarshalXMLAttr(name)
if err != nil {
return err
}
if attr.Name.Local != "" {
start.Attr = append(start.Attr, attr)
}
return nil
}
}
if val.CanInterface() && val.Type().Implements(textMarshalerType) {
text, err := val.Interface().(encoding.TextMarshaler).MarshalText()
if err != nil {
return err
}
start.Attr = append(start.Attr, xml.Attr{Name: name, Value: string(text)})
return nil
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(textMarshalerType) {
text, err := pv.Interface().(encoding.TextMarshaler).MarshalText()
if err != nil {
return err
}
start.Attr = append(start.Attr, xml.Attr{Name: name, Value: string(text)})
return nil
}
}
// Dereference or skip nil pointer, interface values.
if val.Kind() == reflect.Pointer || val.Kind() == reflect.Interface {
if val.IsNil() {
return nil
}
val = val.Elem()
}
// Walk slices.
if val.Kind() == reflect.Slice && val.Type().Elem().Kind() != reflect.Uint8 {
n := val.Len()
for i := 0; i < n; i++ {
if err := p.marshalAttr(start, name, val.Index(i)); err != nil {
return err
}
}
return nil
}
if val.Type() == attrType {
start.Attr = append(start.Attr, val.Interface().(xml.Attr))
return nil
}
s, b, err := p.marshalSimple(val.Type(), val)
if err != nil {
return err
}
if b != nil {
s = string(b)
}
start.Attr = append(start.Attr, xml.Attr{Name: name, Value: s})
return nil
}
// marshalInterface marshals a Marshaler interface value.
func (p *printer) marshalInterface(val marshaler, start xml.StartElement) error {
// Push a marker onto the tag stack so that MarshalXML
// cannot close the XML tags that it did not open.
p.tags = append(p.tags, xml.Name{})
n := len(p.tags)
err := val.MarshalXML(p.encoder, start)
if err != nil {
return err
}
// Make sure MarshalXML closed all its tags. p.tags[n-1] is the mark.
if len(p.tags) > n {
return fmt.Errorf("xml: %s.MarshalXML wrote invalid XML: <%s> not closed", receiverType(val), p.tags[len(p.tags)-1].Local)
}
p.tags = p.tags[:n-1]
return nil
}
// marshalTextInterface marshals a TextMarshaler interface value.
func (p *printer) marshalTextInterface(val encoding.TextMarshaler, start xml.StartElement) error {
if err := p.writeStart(&start); err != nil {
return err
}
text, err := val.MarshalText()
if err != nil {
return err
}
xml.EscapeText(p, text)
return p.writeEnd(start.Name)
}
// writeStart writes the given start element.
func (p *printer) writeStart(start *xml.StartElement) error {
if start.Name.Local == "" {
return fmt.Errorf("xml: start tag with no name")
}
p.tags = append(p.tags, start.Name)
p.markPrefix()
p.writeIndent(1)
p.WriteByte('<')
// TODO patch for namespace prefix
// p.WriteString(start.Name.Local)
p.WriteString(NameSpace + ":" + start.Name.Local)
if start.Name.Space != "" {
p.WriteString(` xmlns="`)
p.EscapeString(start.Name.Space)
p.WriteByte('"')
}
// Attributes
for _, attr := range start.Attr {
name := attr.Name
if name.Local == "" {
continue
}
p.WriteByte(' ')
if name.Space != "" {
p.WriteString(p.createAttrPrefix(name.Space))
p.WriteByte(':')
}
p.WriteString(name.Local)
p.WriteString(`="`)
p.EscapeString(attr.Value)
p.WriteByte('"')
}
p.WriteByte('>')
return nil
}
func (p *printer) writeEnd(name xml.Name) error {
if name.Local == "" {
return fmt.Errorf("xml: end tag with no name")
}
if len(p.tags) == 0 || p.tags[len(p.tags)-1].Local == "" {
return fmt.Errorf("xml: end tag </%s> without start tag", name.Local)
}
if top := p.tags[len(p.tags)-1]; top != name {
if top.Local != name.Local {
return fmt.Errorf("xml: end tag </%s> does not match start tag <%s>", name.Local, top.Local)
}
return fmt.Errorf("xml: end tag </%s> in namespace %s does not match start tag <%s> in namespace %s", name.Local, name.Space, top.Local, top.Space)
}
p.tags = p.tags[:len(p.tags)-1]
p.writeIndent(-1)
p.WriteByte('<')
p.WriteByte('/')
// TODO patch for namespace prefix
// p.WriteString(name.Local)
p.WriteString(NameSpace + ":" + name.Local)
p.WriteByte('>')
p.popPrefix()
return nil
}
func (p *printer) marshalSimple(typ reflect.Type, val reflect.Value) (string, []byte, error) {
switch val.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return strconv.FormatInt(val.Int(), 10), nil, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(val.Uint(), 10), nil, nil
case reflect.Float32, reflect.Float64:
return strconv.FormatFloat(val.Float(), 'g', -1, val.Type().Bits()), nil, nil
case reflect.String:
return val.String(), nil, nil
case reflect.Bool:
return strconv.FormatBool(val.Bool()), nil, nil
case reflect.Array:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// [...]byte
var bytes []byte
if val.CanAddr() {
bytes = val.Slice(0, val.Len()).Bytes()
} else {
bytes = make([]byte, val.Len())
reflect.Copy(reflect.ValueOf(bytes), val)
}
return "", bytes, nil
case reflect.Slice:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// []byte
return "", val.Bytes(), nil
}
return "", nil, &xml.UnsupportedTypeError{Type: typ}
}
func (p *printer) marshalStruct(tinfo *typeInfo, val reflect.Value) error {
s := parentStack{p: p}
for i := range tinfo.fields {
finfo := &tinfo.fields[i]
if finfo.flags&fAttr != 0 {
continue
}
vf := finfo.value(val, dontInitNilPointers)
if !vf.IsValid() {
// The field is behind an anonymous struct field that's
// nil. Skip it.
continue
}
switch finfo.flags & fMode {
case fCDATA, fCharData:
emit := xml.EscapeText
if finfo.flags&fMode == fCDATA {
emit = emitCDATA
}
if err := s.trim(finfo.parents); err != nil {
return err
}
if vf.CanInterface() && vf.Type().Implements(textMarshalerType) {
data, err := vf.Interface().(encoding.TextMarshaler).MarshalText()
if err != nil {
return err
}
if err := emit(p, data); err != nil {
return err
}
continue
}
if vf.CanAddr() {
pv := vf.Addr()
if pv.CanInterface() && pv.Type().Implements(textMarshalerType) {
data, err := pv.Interface().(encoding.TextMarshaler).MarshalText()
if err != nil {
return err
}
if err := emit(p, data); err != nil {
return err
}
continue
}
}
var scratch [64]byte
vf = indirect(vf)
switch vf.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if err := emit(p, strconv.AppendInt(scratch[:0], vf.Int(), 10)); err != nil {
return err
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
if err := emit(p, strconv.AppendUint(scratch[:0], vf.Uint(), 10)); err != nil {
return err