Got rid of depracated Node api functions. Removed dependency on go-iconv in favor of go-charset (See README). go-charset is a native Go package and thus requires no CGO functionality. Meaning go-pkg-xmlx and go-pkg-rss can now be used in Google AppEngine. Some speed and memory efficiency improvements added. Should now do a lot less []byte -> string conversions.

README

@@ -12,13 +12,14 @@
  DEPENDENCIES
 ================================================================================
 
- goinstall github.com/sloonz/go-iconv/src
+ goinstall go-charset.googlecode.com/hg/charset
 
 ================================================================================
  USAGE
 ================================================================================
 
- Getting the package up and running is simple enough:
+ Getting the package up and running is simple enough. This should also 
+ automatically take care of any dependencies for you:
  
     $ goinstall github.com/jteeuwen/go-pkg-xmlx
 

document.go

@@ -28,24 +28,26 @@ import (
 	"os"
 	"io"
 	"io/ioutil"
-	"path"
 	"strings"
+	"bytes"
 	"xml"
 	"fmt"
 	"http"
-	iconv "github.com/sloonz/go-iconv/src"
+	"go-charset.googlecode.com/hg/charset"
 )
 
+// represents a single XML document.
 type Document struct {
-	Version     string
+	Version     string            // XML version
-	Encoding    string
+	Encoding    string            // Encoding found in document. If absent, assumes UTF-8.
-	StandAlone  string
+	StandAlone  string            // Value of XML doctype's 'standalone' attribute.
-	SaveDocType bool
+	SaveDocType bool              // Whether not to include the XML doctype in saves.
-	Root        *Node
+	Root        *Node             // The document's root node.
-	Entity      map[string]string
+	Entity      map[string]string // Mapping of custom entity conversions.
-	Verbose     bool
+	Verbose     bool              // [depracated] Not actually used anymore.
 }
 
+// Create a new, empty XML document instance.
 func New() *Document {
 	return &Document{
 		Version:     "1.0",
@@ -53,7 +55,6 @@ func New() *Document {
 		StandAlone:  "yes",
 		SaveDocType: true,
 		Entity:      make(map[string]string),
-		Verbose:     false,
 	}
 }
 
@@ -64,50 +65,38 @@ func New() *Document {
 // defined on http://www.w3.org/TR/html4/sgml/entities.html
 func (this *Document) LoadExtendedEntityMap() { loadNonStandardEntities(this.Entity) }
 
-func (this *Document) String() string {
+// Select a single node with the given namespace and name. Returns nil if no
-	s, _ := this.SaveString()
+// matching node was found.
-	return s
-}
-
 func (this *Document) SelectNode(namespace, name string) *Node {
 	return this.Root.SelectNode(namespace, name)
 }
 
+// Select all nodes with the given namespace and name. Returns an empty slice
+// if no matches were found.
 func (this *Document) SelectNodes(namespace, name string) []*Node {
 	return this.Root.SelectNodes(namespace, name)
 }
 
-// *****************************************************************************
+// Load the contents of this document from the supplied reader.
-// *** Satisfy ILoader interface
+func (this *Document) LoadStream(r io.Reader) (err os.Error) {
-// *****************************************************************************
+	xp := xml.NewParser(r)
-func (this *Document) LoadString(s string) (err os.Error) {
-	// Ensure we are passing UTF-8 encoding content to the XML tokenizer.
-	if s, err = this.correctEncoding(s); err != nil {
-		return
-	}
-
-	// tokenize data
-	xp := xml.NewParser(strings.NewReader(s))
 	xp.Entity = this.Entity
+	xp.CharsetReader = func(enc string, input io.Reader) (io.Reader, os.Error) {
+		return charset.NewReader(enc, input)
+	}
 
 	this.Root = NewNode(NT_ROOT)
 	ct := this.Root
 
 	var tok xml.Token
 	var t *Node
-	var i int
 	var doctype string
-	var v xml.Attr
 
 	for {
 		if tok, err = xp.Token(); err != nil {
 			if err == os.EOF {
 				return nil
 			}
-
-			if this.Verbose {
-				fmt.Fprintf(os.Stderr, "Xml Error: %s\n", err)
-			}
 			return err
 		}
 
@@ -128,7 +117,7 @@ func (this *Document) LoadString(s string) (err os.Error) {
 			t = NewNode(NT_ELEMENT)
 			t.Name = tt.Name
 			t.Attributes = make([]*Attr, len(tt.Attr))
-			for i, v = range tt.Attr {
+			for i, v := range tt.Attr {
 				t.Attributes[i] = new(Attr)
 				t.Attributes[i].Name = v.Name
 				t.Attributes[i].Value = v.Value
@@ -138,7 +127,7 @@ func (this *Document) LoadString(s string) (err os.Error) {
 		case xml.ProcInst:
 			if tt.Target == "xml" { // xml doctype
 				doctype = strings.TrimSpace(string(tt.Inst))
-				if i = strings.Index(doctype, `standalone="`); i > -1 {
+				if i := strings.Index(doctype, `standalone="`); i > -1 {
 					this.StandAlone = doctype[i+len(`standalone="`) : len(doctype)]
 					i = strings.Index(this.StandAlone, `"`)
 					this.StandAlone = this.StandAlone[0:i]
@@ -159,16 +148,28 @@ func (this *Document) LoadString(s string) (err os.Error) {
 	return
 }
 
-func (this *Document) LoadFile(filename string) (err os.Error) {
+// Load the contents of this document from the supplied byte slice.
-	var data []byte
+func (this *Document) LoadBytes(d []byte) (err os.Error) {
+	return this.LoadStream(bytes.NewBuffer(d))
+}
 
-	if data, err = ioutil.ReadFile(path.Clean(filename)); err != nil {
+// Load the contents of this document from the supplied string.
+func (this *Document) LoadString(s string) (err os.Error) {
+	return this.LoadStream(strings.NewReader(s))
+}
+
+// Load the contents of this document from the supplied file.
+func (this *Document) LoadFile(filename string) (err os.Error) {
+	var fd *os.File
+	if fd, err = os.Open(filename); err != nil {
 		return
 	}
 
-	return this.LoadString(string(data))
+	defer fd.Close()
+	return this.LoadStream(fd)
 }
 
+// Load the contents of this document from the supplied uri.
 func (this *Document) LoadUri(uri string) (err os.Error) {
 	var r *http.Response
 	if r, _, err = http.Get(uri); err != nil {
@@ -176,105 +177,36 @@ func (this *Document) LoadUri(uri string) (err os.Error) {
 	}
 
 	defer r.Body.Close()
-
+	return this.LoadStream(r.Body)
-	var b []byte
-	if b, err = ioutil.ReadAll(r.Body); err != nil {
-		return
 }
 
-	return this.LoadString(string(b))
+// Save the contents of this document to the supplied file.
+func (this *Document) SaveFile(path string) os.Error {
+	return ioutil.WriteFile(path, this.SaveBytes(), 0600)
 }
 
-func (this *Document) LoadStream(r io.Reader) (err os.Error) {
+// Save the contents of this document as a byte slice.
-	var b []byte
+func (this *Document) SaveBytes() []byte {
-	if b, err = ioutil.ReadAll(r); err != nil {
+	var b bytes.Buffer
-		return
-	}
-	return this.LoadString(string(b))
-}
 
-// *****************************************************************************
-// *** Satisfy ISaver interface
-// *****************************************************************************
-func (this *Document) SaveFile(path string) (err os.Error) {
-	var data string
-	if data, err = this.SaveString(); err != nil {
-		return
-	}
-
-	return ioutil.WriteFile(path, []byte(data), 0600)
-}
-
-func (this *Document) SaveString() (s string, err os.Error) {
 	if this.SaveDocType {
-		s = fmt.Sprintf(`<?xml version="%s" encoding="%s" standalone="%s"?>`,
+		b.WriteString(fmt.Sprintf(`<?xml version="%s" encoding="%s" standalone="%s"?>`,
-			this.Version, this.Encoding, this.StandAlone)
+			this.Version, this.Encoding, this.StandAlone))
 	}
 
-	s += this.Root.String()
+	b.Write(this.Root.Bytes())
-	return
+	return b.Bytes()
 }
 
+// Save the contents of this document as a string.
+func (this *Document) SaveString() string { return string(this.SaveBytes()) }
+
+// Alias for Document.SaveString(). This one is invoked by anything looking for
+// the standard String() method (eg: fmt.Printf("%s\n", mydoc).
+func (this *Document) String() string { return string(this.SaveBytes()) }
+
+// Save the contents of this document to the supplied writer.
 func (this *Document) SaveStream(w io.Writer) (err os.Error) {
-	var s string
+	_, err = w.Write(this.SaveBytes())
-	if s, err = this.SaveString(); err != nil {
 	return
 }
-	_, err = w.Write([]byte(s))
-	return
-}
-
-// Use libiconv to ensure we get UTF-8 encoded data. The Go Xml tokenizer will
-// throw a tantrum if we give it anything else.
-func (this *Document) correctEncoding(data string) (ret string, err os.Error) {
-	var cd *iconv.Iconv
-	var tok xml.Token
-
-	enc := "utf-8"
-	xp := xml.NewParser(strings.NewReader(data))
-	xp.Entity = this.Entity
-
-loop:
-	for {
-		if tok, err = xp.Token(); err != nil {
-			if err == os.EOF {
-				break loop
-			}
-
-			return "", err
-		}
-
-		switch tt := tok.(type) {
-		case xml.ProcInst:
-			if tt.Target == "xml" { // xml doctype
-				var pair []string
-				var entry string
-
-				list := strings.Split(string(tt.Inst), " ", -1)
-				for _, entry = range list {
-					if pair = strings.Split(entry, "=", -1); len(pair) < 2 {
-						continue
-					}
-
-					switch pair[0] {
-					case "encoding":
-						enc = pair[1][1 : len(pair[1])-1]
-						break loop
-					}
-				}
-			}
-		}
-	}
-
-	if strings.ToLower(enc) == "utf-8" {
-		// Data already in utf-8 format. Nothing to do here.
-		return data, nil
-	}
-
-	if cd, err = iconv.Open("utf-8", enc); err != nil {
-		return
-	}
-
-	defer cd.Close()
-	return cd.Conv(data)
-}

node.go

@@ -6,7 +6,6 @@ package xmlx
 
 import (
 	"os"
-	"strings"
 	"xml"
 	"bytes"
 	"fmt"
@@ -22,18 +21,18 @@ const (
 )
 
 type Attr struct {
-	Name  xml.Name
+	Name  xml.Name // Attribute namespace and name.
-	Value string
+	Value string   // Attribute value. 
 }
 
 type Node struct {
-	Type       byte
+	Type       byte     // Node type.
-	Name       xml.Name
+	Name       xml.Name // Node namespace and name.
-	Children   []*Node
+	Children   []*Node  // Child nodes.
-	Attributes []*Attr
+	Attributes []*Attr  // Node attributes.
-	Parent     *Node
+	Parent     *Node    // Parent node.
-	Value      string
+	Value      string   // Node value.
-	Target     string // procinst field
+	Target     string   // procinst field.
 }
 
 func NewNode(tid byte) *Node {
@@ -47,7 +46,7 @@ func NewNode(tid byte) *Node {
 // This wraps the standard xml.Unmarshal function and supplies this particular
 // node as the content to be unmarshalled.
 func (this *Node) Unmarshal(obj interface{}) os.Error {
-	return xml.Unmarshal(strings.NewReader(this.String()), obj)
+	return xml.Unmarshal(bytes.NewBuffer(this.Bytes()), obj)
 }
 
 // Get node value as string
@@ -58,10 +57,6 @@ func (this *Node) S(namespace, name string) string {
 	return ""
 }
 
-// Deprecated - use Node.S()
-func (this *Node) GetValue(namespace, name string) string { return this.S(namespace, name) }
-
-
 // Get node value as int
 func (this *Node) I(namespace, name string) int {
 	if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
@@ -71,10 +66,6 @@ func (this *Node) I(namespace, name string) int {
 	return 0
 }
 
-// Deprecated - use Node.I()
-func (this *Node) GetValuei(namespace, name string) int { return this.I(namespace, name) }
-
-
 // Get node value as int64
 func (this *Node) I64(namespace, name string) int64 {
 	if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
@@ -84,10 +75,6 @@ func (this *Node) I64(namespace, name string) int64 {
 	return 0
 }
 
-// Deprecated - use Node.I64()
-func (this *Node) GetValuei64(namespace, name string) int64 { return this.I64(namespace, name) }
-
-
 // Get node value as uint
 func (this *Node) U(namespace, name string) uint {
 	if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
@@ -97,10 +84,6 @@ func (this *Node) U(namespace, name string) uint {
 	return 0
 }
 
-// Deprecated - use Node.U()
-func (this *Node) GetValueui(namespace, name string) uint { return this.U(namespace, name) }
-
-
 // Get node value as uint64
 func (this *Node) U64(namespace, name string) uint64 {
 	if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
@@ -110,9 +93,6 @@ func (this *Node) U64(namespace, name string) uint64 {
 	return 0
 }
 
-// Deprecated - use Node.U64()
-func (this *Node) GetValueui64(namespace, name string) uint64 { return this.U64(namespace, name) }
-
 // Get node value as float32
 func (this *Node) F32(namespace, name string) float32 {
 	if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
@@ -122,10 +102,6 @@ func (this *Node) F32(namespace, name string) float32 {
 	return 0
 }
 
-// Deprecated - use Node.F32()
-func (this *Node) GetValuef32(namespace, name string) float32 { return this.F32(namespace, name) }
-
-
 // Get node value as float64
 func (this *Node) F64(namespace, name string) float64 {
 	if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
@@ -135,10 +111,6 @@ func (this *Node) F64(namespace, name string) float64 {
 	return 0
 }
 
-// Deprecated - use Node.F64()
-func (this *Node) GetValuef64(namespace, name string) float64 { return this.F64(namespace, name) }
-
-
 // Get node value as bool
 func (this *Node) B(namespace, name string) bool {
 	if node := rec_SelectNode(this, namespace, name); node != nil && node.Value != "" {
@@ -158,10 +130,6 @@ func (this *Node) As(namespace, name string) string {
 	return ""
 }
 
-// Deprecated - use Node.As()
-func (this *Node) GetAttr(namespace, name string) string { return this.As(namespace, name) }
-
-
 // Get attribute value as int
 func (this *Node) Ai(namespace, name string) int {
 	if s := this.As(namespace, name); s != "" {
@@ -171,10 +139,6 @@ func (this *Node) Ai(namespace, name string) int {
 	return 0
 }
 
-// Deprecated - use Node.Ai()
-func (this *Node) GetAttri(namespace, name string) int { return this.Ai(namespace, name) }
-
-
 // Get attribute value as uint
 func (this *Node) Au(namespace, name string) uint {
 	if s := this.As(namespace, name); s != "" {
@@ -184,10 +148,6 @@ func (this *Node) Au(namespace, name string) uint {
 	return 0
 }
 
-// Deprecated - use Node.Au()
-func (this *Node) GetAttrui(namespace, name string) uint { return this.Au(namespace, name) }
-
-
 // Get attribute value as uint64
 func (this *Node) Au64(namespace, name string) uint64 {
 	if s := this.As(namespace, name); s != "" {
@@ -197,10 +157,6 @@ func (this *Node) Au64(namespace, name string) uint64 {
 	return 0
 }
 
-// Deprecated - use Node.Au64()
-func (this *Node) GetAttrui64(namespace, name string) uint64 { return this.Au64(namespace, name) }
-
-
 // Get attribute value as int64
 func (this *Node) Ai64(namespace, name string) int64 {
 	if s := this.As(namespace, name); s != "" {
@@ -210,9 +166,6 @@ func (this *Node) Ai64(namespace, name string) int64 {
 	return 0
 }
 
-// Deprecated - use Node.Ai64()
-func (this *Node) GetAttri64(namespace, name string) int64 { return this.Ai64(namespace, name) }
-
 // Get attribute value as float32
 func (this *Node) Af32(namespace, name string) float32 {
 	if s := this.As(namespace, name); s != "" {
@@ -222,9 +175,6 @@ func (this *Node) Af32(namespace, name string) float32 {
 	return 0
 }
 
-// Deprecated - use Node.Af32()
-func (this *Node) GetAttrf32(namespace, name string) float32 { return this.Af32(namespace, name) }
-
 // Get attribute value as float64
 func (this *Node) Af64(namespace, name string) float64 {
 	if s := this.As(namespace, name); s != "" {
@@ -234,10 +184,6 @@ func (this *Node) Af64(namespace, name string) float64 {
 	return 0
 }
 
-// Deprecated - use Node.Af64()
-func (this *Node) GetAttrf64(namespace, name string) float64 { return this.Af64(namespace, name) }
-
-
 // Get attribute value as bool
 func (this *Node) Ab(namespace, name string) bool {
 	if s := this.As(namespace, name); s != "" {
@@ -298,94 +244,100 @@ func rec_SelectNodes(cn *Node, namespace, name string, list *[]*Node) {
 	}
 }
 
+// Convert node to appropriate []byte representation based on it's @Type.
+// Note that NT_ROOT is a special-case empty node used as the root for a
+// Document. This one has no representation by itself. It merely forwards the
+// String() call to it's child nodes.
+func (this *Node) Bytes() (b []byte) {
+	switch this.Type {
+	case NT_PROCINST:
+		b = this.printProcInst()
+	case NT_COMMENT:
+		b = this.printComment()
+	case NT_DIRECTIVE:
+		b = this.printDirective()
+	case NT_ELEMENT:
+		b = this.printElement()
+	case NT_ROOT:
+		b = this.printRoot()
+	}
+	return
+}
+
 // Convert node to appropriate string representation based on it's @Type.
 // Note that NT_ROOT is a special-case empty node used as the root for a
 // Document. This one has no representation by itself. It merely forwards the
 // String() call to it's child nodes.
 func (this *Node) String() (s string) {
-	switch this.Type {
+	return string(this.Bytes())
-	case NT_PROCINST:
-		s = this.printProcInst()
-	case NT_COMMENT:
-		s = this.printComment()
-	case NT_DIRECTIVE:
-		s = this.printDirective()
-	case NT_ELEMENT:
-		s = this.printElement()
-	case NT_ROOT:
-		s = this.printRoot()
-	}
-	return
 }
 
-func (this *Node) printRoot() (s string) {
+func (this *Node) printRoot() []byte {
-	var data []byte
+	var b bytes.Buffer
-	buf := bytes.NewBuffer(data)
 	for _, v := range this.Children {
-		buf.WriteString(v.String())
+		b.WriteString(v.String())
 	}
-	return buf.String()
+	return b.Bytes()
 }
 
-func (this *Node) printProcInst() string {
+func (this *Node) printProcInst() []byte {
-	return "<?" + this.Target + " " + this.Value + "?>"
+	return []byte("<?" + this.Target + " " + this.Value + "?>")
 }
 
-func (this *Node) printComment() string {
+func (this *Node) printComment() []byte {
-	return "<!-- " + this.Value + " -->"
+	return []byte("<!-- " + this.Value + " -->")
 }
 
-func (this *Node) printDirective() string {
+func (this *Node) printDirective() []byte {
-	return "<!" + this.Value + "!>"
+	return []byte("<!" + this.Value + "!>")
 }
 
-func (this *Node) printElement() string {
+func (this *Node) printElement() []byte {
-	var data []byte
+	var b bytes.Buffer
-	buf := bytes.NewBuffer(data)
 
 	if len(this.Name.Space) > 0 {
-		buf.WriteRune('<')
+		b.WriteRune('<')
-		buf.WriteString(this.Name.Space)
+		b.WriteString(this.Name.Space)
-		buf.WriteRune(':')
+		b.WriteRune(':')
-		buf.WriteString(this.Name.Local)
+		b.WriteString(this.Name.Local)
 	} else {
-		buf.WriteRune('<')
+		b.WriteRune('<')
-		buf.WriteString(this.Name.Local)
+		b.WriteString(this.Name.Local)
 	}
 
 	for _, v := range this.Attributes {
 		if len(v.Name.Space) > 0 {
-			buf.WriteString(fmt.Sprintf(` %s:%s="%s"`, v.Name.Space, v.Name.Local, v.Value))
+			b.WriteString(fmt.Sprintf(` %s:%s="%s"`, v.Name.Space, v.Name.Local, v.Value))
 		} else {
-			buf.WriteString(fmt.Sprintf(` %s="%s"`, v.Name.Local, v.Value))
+			b.WriteString(fmt.Sprintf(` %s="%s"`, v.Name.Local, v.Value))
 		}
 	}
 
 	if len(this.Children) == 0 && len(this.Value) == 0 {
-		buf.WriteString(" />")
+		b.WriteString(" />")
-		return buf.String()
+		return b.Bytes()
 	}
 
-	buf.WriteRune('>')
+	b.WriteRune('>')
 
 	for _, v := range this.Children {
-		buf.WriteString(v.String())
+		b.WriteString(v.String())
 	}
 
-	buf.WriteString(this.Value)
+	b.WriteString(this.Value)
 	if len(this.Name.Space) > 0 {
-		buf.WriteString("</")
+		b.WriteString("</")
-		buf.WriteString(this.Name.Space)
+		b.WriteString(this.Name.Space)
-		buf.WriteRune(':')
+		b.WriteRune(':')
-		buf.WriteString(this.Name.Local)
+		b.WriteString(this.Name.Local)
-		buf.WriteRune('>')
+		b.WriteRune('>')
 	} else {
-		buf.WriteString("</")
+		b.WriteString("</")
-		buf.WriteString(this.Name.Local)
+		b.WriteString(this.Name.Local)
-		buf.WriteRune('>')
+		b.WriteRune('>')
 	}
 
-	return buf.String()
+	return b.Bytes()
 }
 
 // Add a child node

test.xml

@@ -1,4 +1,3 @@
-<!DOCTYPE xml>
 <?xml version="1.0" encoding="utf-8"?>
 <rss version="0.91">
 	<channel>

test1.xml

@@ -1 +1 @@
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+<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="0.91"><channel><title>WriteTheWeb</title><link>http://writetheweb.com</link><description>News for web users that write back</description><language>en-us</language><copyright>Copyright 2000, WriteTheWeb team.</copyright><managingEditor>editor@writetheweb.com</managingEditor><webMaster>webmaster@writetheweb.com</webMaster><image><title>WriteTheWeb</title><url>http://writetheweb.com/images/mynetscape88.gif</url><link>http://writetheweb.com</link><width>88</width><height>31</height><description>News for web users that write back</description></image><item><title>Giving the world a pluggable Gnutella</title><link>http://writetheweb.com/read.php?item=24</link><description>WorldOS is a framework on which to build programs that work like Freenet or Gnutella -allowing distributed applications using peer-to-peer routing.</description></item><item><title>Syndication discussions hot up</title><link>http://writetheweb.com/read.php?item=23</link><description>After a period of dormancy, the Syndication mailing list has become active again, with contributions from leaders in traditional media and Web syndication.</description></item><item><title>Personal web server integrates file sharing and messaging</title><link>http://writetheweb.com/read.php?item=22</link><description>The Magi Project is an innovative project to create a combined personal web server and messaging system that enables the sharing and synchronization of information across desktop, laptop and palmtop devices.</description></item><item><title>Syndication and Metadata</title><link>http://writetheweb.com/read.php?item=21</link><description>RSS is probably the best known metadata format around. RDF is probably one of the least understood. In this essay, published on my O'Reilly Network weblog, I argue that the next generation of RSS should be based on RDF.</description></item><item><title>UK bloggers get organised</title><link>http://writetheweb.com/read.php?item=20</link><description>Looks like the weblogs scene is gathering pace beyond the shores of the US. There's now a UK-specific page on weblogs.com, and a mailing list at egroups.</description></item><item><title>Yournamehere.com more important than anything</title><link>http://writetheweb.com/read.php?item=19</link><description>Whatever you're publishing on the web, your site name is the most valuable asset you have, according to Carl Steadman.</description></item></channel></rss>