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path: root/src/pkg/xml/xml.go
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-rw-r--r--src/pkg/xml/xml.go1694
1 files changed, 1694 insertions, 0 deletions
diff --git a/src/pkg/xml/xml.go b/src/pkg/xml/xml.go
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+++ b/src/pkg/xml/xml.go
@@ -0,0 +1,1694 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package xml implements a simple XML 1.0 parser that
+// understands XML name spaces.
+package xml
+
+// References:
+// Annotated XML spec: http://www.xml.com/axml/testaxml.htm
+// XML name spaces: http://www.w3.org/TR/REC-xml-names/
+
+// TODO(rsc):
+// Test error handling.
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "io"
+ "os"
+ "strconv"
+ "strings"
+ "unicode"
+ "utf8"
+)
+
+// A SyntaxError represents a syntax error in the XML input stream.
+type SyntaxError struct {
+ Msg string
+ Line int
+}
+
+func (e *SyntaxError) String() string {
+ return "XML syntax error on line " + strconv.Itoa(e.Line) + ": " + e.Msg
+}
+
+// A Name represents an XML name (Local) annotated
+// with a name space identifier (Space).
+// In tokens returned by Parser.Token, the Space identifier
+// is given as a canonical URL, not the short prefix used
+// in the document being parsed.
+type Name struct {
+ Space, Local string
+}
+
+// An Attr represents an attribute in an XML element (Name=Value).
+type Attr struct {
+ Name Name
+ Value string
+}
+
+// A Token is an interface holding one of the token types:
+// StartElement, EndElement, CharData, Comment, ProcInst, or Directive.
+type Token interface{}
+
+// A StartElement represents an XML start element.
+type StartElement struct {
+ Name Name
+ Attr []Attr
+}
+
+func (e StartElement) Copy() StartElement {
+ attrs := make([]Attr, len(e.Attr))
+ copy(e.Attr, attrs)
+ e.Attr = attrs
+ return e
+}
+
+// An EndElement represents an XML end element.
+type EndElement struct {
+ Name Name
+}
+
+// A CharData represents XML character data (raw text),
+// in which XML escape sequences have been replaced by
+// the characters they represent.
+type CharData []byte
+
+func makeCopy(b []byte) []byte {
+ b1 := make([]byte, len(b))
+ copy(b1, b)
+ return b1
+}
+
+func (c CharData) Copy() CharData { return CharData(makeCopy(c)) }
+
+// A Comment represents an XML comment of the form <!--comment-->.
+// The bytes do not include the <!-- and --> comment markers.
+type Comment []byte
+
+func (c Comment) Copy() Comment { return Comment(makeCopy(c)) }
+
+// A ProcInst represents an XML processing instruction of the form <?target inst?>
+type ProcInst struct {
+ Target string
+ Inst []byte
+}
+
+func (p ProcInst) Copy() ProcInst {
+ p.Inst = makeCopy(p.Inst)
+ return p
+}
+
+// A Directive represents an XML directive of the form <!text>.
+// The bytes do not include the <! and > markers.
+type Directive []byte
+
+func (d Directive) Copy() Directive { return Directive(makeCopy(d)) }
+
+// CopyToken returns a copy of a Token.
+func CopyToken(t Token) Token {
+ switch v := t.(type) {
+ case CharData:
+ return v.Copy()
+ case Comment:
+ return v.Copy()
+ case Directive:
+ return v.Copy()
+ case ProcInst:
+ return v.Copy()
+ case StartElement:
+ return v.Copy()
+ }
+ return t
+}
+
+// A Parser represents an XML parser reading a particular input stream.
+// The parser assumes that its input is encoded in UTF-8.
+type Parser struct {
+ // Strict defaults to true, enforcing the requirements
+ // of the XML specification.
+ // If set to false, the parser allows input containing common
+ // mistakes:
+ // * If an element is missing an end tag, the parser invents
+ // end tags as necessary to keep the return values from Token
+ // properly balanced.
+ // * In attribute values and character data, unknown or malformed
+ // character entities (sequences beginning with &) are left alone.
+ //
+ // Setting:
+ //
+ // p.Strict = false;
+ // p.AutoClose = HTMLAutoClose;
+ // p.Entity = HTMLEntity
+ //
+ // creates a parser that can handle typical HTML.
+ Strict bool
+
+ // When Strict == false, AutoClose indicates a set of elements to
+ // consider closed immediately after they are opened, regardless
+ // of whether an end element is present.
+ AutoClose []string
+
+ // Entity can be used to map non-standard entity names to string replacements.
+ // The parser behaves as if these standard mappings are present in the map,
+ // regardless of the actual map content:
+ //
+ // "lt": "<",
+ // "gt": ">",
+ // "amp": "&",
+ // "apos": "'",
+ // "quot": `"`,
+ Entity map[string]string
+
+ // CharsetReader, if non-nil, defines a function to generate
+ // charset-conversion readers, converting from the provided
+ // non-UTF-8 charset into UTF-8. If CharsetReader is nil or
+ // returns an error, parsing stops with an error. One of the
+ // the CharsetReader's result values must be non-nil.
+ CharsetReader func(charset string, input io.Reader) (io.Reader, os.Error)
+
+ r io.ByteReader
+ buf bytes.Buffer
+ saved *bytes.Buffer
+ stk *stack
+ free *stack
+ needClose bool
+ toClose Name
+ nextToken Token
+ nextByte int
+ ns map[string]string
+ err os.Error
+ line int
+ tmp [32]byte
+}
+
+// NewParser creates a new XML parser reading from r.
+func NewParser(r io.Reader) *Parser {
+ p := &Parser{
+ ns: make(map[string]string),
+ nextByte: -1,
+ line: 1,
+ Strict: true,
+ }
+ p.switchToReader(r)
+ return p
+}
+
+// Token returns the next XML token in the input stream.
+// At the end of the input stream, Token returns nil, os.EOF.
+//
+// Slices of bytes in the returned token data refer to the
+// parser's internal buffer and remain valid only until the next
+// call to Token. To acquire a copy of the bytes, call CopyToken
+// or the token's Copy method.
+//
+// Token expands self-closing elements such as <br/>
+// into separate start and end elements returned by successive calls.
+//
+// Token guarantees that the StartElement and EndElement
+// tokens it returns are properly nested and matched:
+// if Token encounters an unexpected end element,
+// it will return an error.
+//
+// Token implements XML name spaces as described by
+// http://www.w3.org/TR/REC-xml-names/. Each of the
+// Name structures contained in the Token has the Space
+// set to the URL identifying its name space when known.
+// If Token encounters an unrecognized name space prefix,
+// it uses the prefix as the Space rather than report an error.
+func (p *Parser) Token() (t Token, err os.Error) {
+ if p.nextToken != nil {
+ t = p.nextToken
+ p.nextToken = nil
+ } else if t, err = p.RawToken(); err != nil {
+ return
+ }
+
+ if !p.Strict {
+ if t1, ok := p.autoClose(t); ok {
+ p.nextToken = t
+ t = t1
+ }
+ }
+ switch t1 := t.(type) {
+ case StartElement:
+ // In XML name spaces, the translations listed in the
+ // attributes apply to the element name and
+ // to the other attribute names, so process
+ // the translations first.
+ for _, a := range t1.Attr {
+ if a.Name.Space == "xmlns" {
+ v, ok := p.ns[a.Name.Local]
+ p.pushNs(a.Name.Local, v, ok)
+ p.ns[a.Name.Local] = a.Value
+ }
+ if a.Name.Space == "" && a.Name.Local == "xmlns" {
+ // Default space for untagged names
+ v, ok := p.ns[""]
+ p.pushNs("", v, ok)
+ p.ns[""] = a.Value
+ }
+ }
+
+ p.translate(&t1.Name, true)
+ for i := range t1.Attr {
+ p.translate(&t1.Attr[i].Name, false)
+ }
+ p.pushElement(t1.Name)
+ t = t1
+
+ case EndElement:
+ p.translate(&t1.Name, true)
+ if !p.popElement(&t1) {
+ return nil, p.err
+ }
+ t = t1
+ }
+ return
+}
+
+// Apply name space translation to name n.
+// The default name space (for Space=="")
+// applies only to element names, not to attribute names.
+func (p *Parser) translate(n *Name, isElementName bool) {
+ switch {
+ case n.Space == "xmlns":
+ return
+ case n.Space == "" && !isElementName:
+ return
+ case n.Space == "" && n.Local == "xmlns":
+ return
+ }
+ if v, ok := p.ns[n.Space]; ok {
+ n.Space = v
+ }
+}
+
+func (p *Parser) switchToReader(r io.Reader) {
+ // Get efficient byte at a time reader.
+ // Assume that if reader has its own
+ // ReadByte, it's efficient enough.
+ // Otherwise, use bufio.
+ if rb, ok := r.(io.ByteReader); ok {
+ p.r = rb
+ } else {
+ p.r = bufio.NewReader(r)
+ }
+}
+
+// Parsing state - stack holds old name space translations
+// and the current set of open elements. The translations to pop when
+// ending a given tag are *below* it on the stack, which is
+// more work but forced on us by XML.
+type stack struct {
+ next *stack
+ kind int
+ name Name
+ ok bool
+}
+
+const (
+ stkStart = iota
+ stkNs
+)
+
+func (p *Parser) push(kind int) *stack {
+ s := p.free
+ if s != nil {
+ p.free = s.next
+ } else {
+ s = new(stack)
+ }
+ s.next = p.stk
+ s.kind = kind
+ p.stk = s
+ return s
+}
+
+func (p *Parser) pop() *stack {
+ s := p.stk
+ if s != nil {
+ p.stk = s.next
+ s.next = p.free
+ p.free = s
+ }
+ return s
+}
+
+// Record that we are starting an element with the given name.
+func (p *Parser) pushElement(name Name) {
+ s := p.push(stkStart)
+ s.name = name
+}
+
+// Record that we are changing the value of ns[local].
+// The old value is url, ok.
+func (p *Parser) pushNs(local string, url string, ok bool) {
+ s := p.push(stkNs)
+ s.name.Local = local
+ s.name.Space = url
+ s.ok = ok
+}
+
+// Creates a SyntaxError with the current line number.
+func (p *Parser) syntaxError(msg string) os.Error {
+ return &SyntaxError{Msg: msg, Line: p.line}
+}
+
+// Record that we are ending an element with the given name.
+// The name must match the record at the top of the stack,
+// which must be a pushElement record.
+// After popping the element, apply any undo records from
+// the stack to restore the name translations that existed
+// before we saw this element.
+func (p *Parser) popElement(t *EndElement) bool {
+ s := p.pop()
+ name := t.Name
+ switch {
+ case s == nil || s.kind != stkStart:
+ p.err = p.syntaxError("unexpected end element </" + name.Local + ">")
+ return false
+ case s.name.Local != name.Local:
+ if !p.Strict {
+ p.needClose = true
+ p.toClose = t.Name
+ t.Name = s.name
+ return true
+ }
+ p.err = p.syntaxError("element <" + s.name.Local + "> closed by </" + name.Local + ">")
+ return false
+ case s.name.Space != name.Space:
+ p.err = p.syntaxError("element <" + s.name.Local + "> in space " + s.name.Space +
+ "closed by </" + name.Local + "> in space " + name.Space)
+ return false
+ }
+
+ // Pop stack until a Start is on the top, undoing the
+ // translations that were associated with the element we just closed.
+ for p.stk != nil && p.stk.kind != stkStart {
+ s := p.pop()
+ p.ns[s.name.Local] = s.name.Space, s.ok
+ }
+
+ return true
+}
+
+// If the top element on the stack is autoclosing and
+// t is not the end tag, invent the end tag.
+func (p *Parser) autoClose(t Token) (Token, bool) {
+ if p.stk == nil || p.stk.kind != stkStart {
+ return nil, false
+ }
+ name := strings.ToLower(p.stk.name.Local)
+ for _, s := range p.AutoClose {
+ if strings.ToLower(s) == name {
+ // This one should be auto closed if t doesn't close it.
+ et, ok := t.(EndElement)
+ if !ok || et.Name.Local != name {
+ return EndElement{p.stk.name}, true
+ }
+ break
+ }
+ }
+ return nil, false
+}
+
+// RawToken is like Token but does not verify that
+// start and end elements match and does not translate
+// name space prefixes to their corresponding URLs.
+func (p *Parser) RawToken() (Token, os.Error) {
+ if p.err != nil {
+ return nil, p.err
+ }
+ if p.needClose {
+ // The last element we read was self-closing and
+ // we returned just the StartElement half.
+ // Return the EndElement half now.
+ p.needClose = false
+ return EndElement{p.toClose}, nil
+ }
+
+ b, ok := p.getc()
+ if !ok {
+ return nil, p.err
+ }
+
+ if b != '<' {
+ // Text section.
+ p.ungetc(b)
+ data := p.text(-1, false)
+ if data == nil {
+ return nil, p.err
+ }
+ return CharData(data), nil
+ }
+
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ switch b {
+ case '/':
+ // </: End element
+ var name Name
+ if name, ok = p.nsname(); !ok {
+ if p.err == nil {
+ p.err = p.syntaxError("expected element name after </")
+ }
+ return nil, p.err
+ }
+ p.space()
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ if b != '>' {
+ p.err = p.syntaxError("invalid characters between </" + name.Local + " and >")
+ return nil, p.err
+ }
+ return EndElement{name}, nil
+
+ case '?':
+ // <?: Processing instruction.
+ // TODO(rsc): Should parse the <?xml declaration to make sure
+ // the version is 1.0 and the encoding is UTF-8.
+ var target string
+ if target, ok = p.name(); !ok {
+ if p.err == nil {
+ p.err = p.syntaxError("expected target name after <?")
+ }
+ return nil, p.err
+ }
+ p.space()
+ p.buf.Reset()
+ var b0 byte
+ for {
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ p.buf.WriteByte(b)
+ if b0 == '?' && b == '>' {
+ break
+ }
+ b0 = b
+ }
+ data := p.buf.Bytes()
+ data = data[0 : len(data)-2] // chop ?>
+
+ if target == "xml" {
+ enc := procInstEncoding(string(data))
+ if enc != "" && enc != "utf-8" && enc != "UTF-8" {
+ if p.CharsetReader == nil {
+ p.err = fmt.Errorf("xml: encoding %q declared but Parser.CharsetReader is nil", enc)
+ return nil, p.err
+ }
+ newr, err := p.CharsetReader(enc, p.r.(io.Reader))
+ if err != nil {
+ p.err = fmt.Errorf("xml: opening charset %q: %v", enc, err)
+ return nil, p.err
+ }
+ if newr == nil {
+ panic("CharsetReader returned a nil Reader for charset " + enc)
+ }
+ p.switchToReader(newr)
+ }
+ }
+ return ProcInst{target, data}, nil
+
+ case '!':
+ // <!: Maybe comment, maybe CDATA.
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ switch b {
+ case '-': // <!-
+ // Probably <!-- for a comment.
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ if b != '-' {
+ p.err = p.syntaxError("invalid sequence <!- not part of <!--")
+ return nil, p.err
+ }
+ // Look for terminator.
+ p.buf.Reset()
+ var b0, b1 byte
+ for {
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ p.buf.WriteByte(b)
+ if b0 == '-' && b1 == '-' && b == '>' {
+ break
+ }
+ b0, b1 = b1, b
+ }
+ data := p.buf.Bytes()
+ data = data[0 : len(data)-3] // chop -->
+ return Comment(data), nil
+
+ case '[': // <![
+ // Probably <![CDATA[.
+ for i := 0; i < 6; i++ {
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ if b != "CDATA["[i] {
+ p.err = p.syntaxError("invalid <![ sequence")
+ return nil, p.err
+ }
+ }
+ // Have <![CDATA[. Read text until ]]>.
+ data := p.text(-1, true)
+ if data == nil {
+ return nil, p.err
+ }
+ return CharData(data), nil
+ }
+
+ // Probably a directive: <!DOCTYPE ...>, <!ENTITY ...>, etc.
+ // We don't care, but accumulate for caller. Quoted angle
+ // brackets do not count for nesting.
+ p.buf.Reset()
+ p.buf.WriteByte(b)
+ inquote := uint8(0)
+ depth := 0
+ for {
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ if inquote == 0 && b == '>' && depth == 0 {
+ break
+ }
+ p.buf.WriteByte(b)
+ switch {
+ case b == inquote:
+ inquote = 0
+
+ case inquote != 0:
+ // in quotes, no special action
+
+ case b == '\'' || b == '"':
+ inquote = b
+
+ case b == '>' && inquote == 0:
+ depth--
+
+ case b == '<' && inquote == 0:
+ depth++
+ }
+ }
+ return Directive(p.buf.Bytes()), nil
+ }
+
+ // Must be an open element like <a href="foo">
+ p.ungetc(b)
+
+ var (
+ name Name
+ empty bool
+ attr []Attr
+ )
+ if name, ok = p.nsname(); !ok {
+ if p.err == nil {
+ p.err = p.syntaxError("expected element name after <")
+ }
+ return nil, p.err
+ }
+
+ attr = make([]Attr, 0, 4)
+ for {
+ p.space()
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ if b == '/' {
+ empty = true
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ if b != '>' {
+ p.err = p.syntaxError("expected /> in element")
+ return nil, p.err
+ }
+ break
+ }
+ if b == '>' {
+ break
+ }
+ p.ungetc(b)
+
+ n := len(attr)
+ if n >= cap(attr) {
+ nattr := make([]Attr, n, 2*cap(attr))
+ copy(nattr, attr)
+ attr = nattr
+ }
+ attr = attr[0 : n+1]
+ a := &attr[n]
+ if a.Name, ok = p.nsname(); !ok {
+ if p.err == nil {
+ p.err = p.syntaxError("expected attribute name in element")
+ }
+ return nil, p.err
+ }
+ p.space()
+ if b, ok = p.mustgetc(); !ok {
+ return nil, p.err
+ }
+ if b != '=' {
+ if p.Strict {
+ p.err = p.syntaxError("attribute name without = in element")
+ return nil, p.err
+ } else {
+ p.ungetc(b)
+ a.Value = a.Name.Local
+ }
+ } else {
+ p.space()
+ data := p.attrval()
+ if data == nil {
+ return nil, p.err
+ }
+ a.Value = string(data)
+ }
+ }
+ if empty {
+ p.needClose = true
+ p.toClose = name
+ }
+ return StartElement{name, attr}, nil
+}
+
+func (p *Parser) attrval() []byte {
+ b, ok := p.mustgetc()
+ if !ok {
+ return nil
+ }
+ // Handle quoted attribute values
+ if b == '"' || b == '\'' {
+ return p.text(int(b), false)
+ }
+ // Handle unquoted attribute values for strict parsers
+ if p.Strict {
+ p.err = p.syntaxError("unquoted or missing attribute value in element")
+ return nil
+ }
+ // Handle unquoted attribute values for unstrict parsers
+ p.ungetc(b)
+ p.buf.Reset()
+ for {
+ b, ok = p.mustgetc()
+ if !ok {
+ return nil
+ }
+ // http://www.w3.org/TR/REC-html40/intro/sgmltut.html#h-3.2.2
+ if 'a' <= b && b <= 'z' || 'A' <= b && b <= 'Z' ||
+ '0' <= b && b <= '9' || b == '_' || b == ':' || b == '-' {
+ p.buf.WriteByte(b)
+ } else {
+ p.ungetc(b)
+ break
+ }
+ }
+ return p.buf.Bytes()
+}
+
+// Skip spaces if any
+func (p *Parser) space() {
+ for {
+ b, ok := p.getc()
+ if !ok {
+ return
+ }
+ switch b {
+ case ' ', '\r', '\n', '\t':
+ default:
+ p.ungetc(b)
+ return
+ }
+ }
+}
+
+// Read a single byte.
+// If there is no byte to read, return ok==false
+// and leave the error in p.err.
+// Maintain line number.
+func (p *Parser) getc() (b byte, ok bool) {
+ if p.err != nil {
+ return 0, false
+ }
+ if p.nextByte >= 0 {
+ b = byte(p.nextByte)
+ p.nextByte = -1
+ } else {
+ b, p.err = p.r.ReadByte()
+ if p.err != nil {
+ return 0, false
+ }
+ if p.saved != nil {
+ p.saved.WriteByte(b)
+ }
+ }
+ if b == '\n' {
+ p.line++
+ }
+ return b, true
+}
+
+// Return saved offset.
+// If we did ungetc (nextByte >= 0), have to back up one.
+func (p *Parser) savedOffset() int {
+ n := p.saved.Len()
+ if p.nextByte >= 0 {
+ n--
+ }
+ return n
+}
+
+// Must read a single byte.
+// If there is no byte to read,
+// set p.err to SyntaxError("unexpected EOF")
+// and return ok==false
+func (p *Parser) mustgetc() (b byte, ok bool) {
+ if b, ok = p.getc(); !ok {
+ if p.err == os.EOF {
+ p.err = p.syntaxError("unexpected EOF")
+ }
+ }
+ return
+}
+
+// Unread a single byte.
+func (p *Parser) ungetc(b byte) {
+ if b == '\n' {
+ p.line--
+ }
+ p.nextByte = int(b)
+}
+
+var entity = map[string]int{
+ "lt": '<',
+ "gt": '>',
+ "amp": '&',
+ "apos": '\'',
+ "quot": '"',
+}
+
+// Read plain text section (XML calls it character data).
+// If quote >= 0, we are in a quoted string and need to find the matching quote.
+// If cdata == true, we are in a <![CDATA[ section and need to find ]]>.
+// On failure return nil and leave the error in p.err.
+func (p *Parser) text(quote int, cdata bool) []byte {
+ var b0, b1 byte
+ var trunc int
+ p.buf.Reset()
+Input:
+ for {
+ b, ok := p.getc()
+ if !ok {
+ if cdata {
+ if p.err == os.EOF {
+ p.err = p.syntaxError("unexpected EOF in CDATA section")
+ }
+ return nil
+ }
+ break Input
+ }
+
+ // <![CDATA[ section ends with ]]>.
+ // It is an error for ]]> to appear in ordinary text.
+ if b0 == ']' && b1 == ']' && b == '>' {
+ if cdata {
+ trunc = 2
+ break Input
+ }
+ p.err = p.syntaxError("unescaped ]]> not in CDATA section")
+ return nil
+ }
+
+ // Stop reading text if we see a <.
+ if b == '<' && !cdata {
+ if quote >= 0 {
+ p.err = p.syntaxError("unescaped < inside quoted string")
+ return nil
+ }
+ p.ungetc('<')
+ break Input
+ }
+ if quote >= 0 && b == byte(quote) {
+ break Input
+ }
+ if b == '&' && !cdata {
+ // Read escaped character expression up to semicolon.
+ // XML in all its glory allows a document to define and use
+ // its own character names with <!ENTITY ...> directives.
+ // Parsers are required to recognize lt, gt, amp, apos, and quot
+ // even if they have not been declared. That's all we allow.
+ var i int
+ for i = 0; i < len(p.tmp); i++ {
+ var ok bool
+ p.tmp[i], ok = p.getc()
+ if !ok {
+ if p.err == os.EOF {
+ p.err = p.syntaxError("unexpected EOF")
+ }
+ return nil
+ }
+ c := p.tmp[i]
+ if c == ';' {
+ break
+ }
+ if 'a' <= c && c <= 'z' ||
+ 'A' <= c && c <= 'Z' ||
+ '0' <= c && c <= '9' ||
+ c == '_' || c == '#' {
+ continue
+ }
+ p.ungetc(c)
+ break
+ }
+ s := string(p.tmp[0:i])
+ if i >= len(p.tmp) {
+ if !p.Strict {
+ b0, b1 = 0, 0
+ p.buf.WriteByte('&')
+ p.buf.Write(p.tmp[0:i])
+ continue Input
+ }
+ p.err = p.syntaxError("character entity expression &" + s + "... too long")
+ return nil
+ }
+ var haveText bool
+ var text string
+ if i >= 2 && s[0] == '#' {
+ var n uint64
+ var err os.Error
+ if i >= 3 && s[1] == 'x' {
+ n, err = strconv.Btoui64(s[2:], 16)
+ } else {
+ n, err = strconv.Btoui64(s[1:], 10)
+ }
+ if err == nil && n <= unicode.MaxRune {
+ text = string(n)
+ haveText = true
+ }
+ } else {
+ if r, ok := entity[s]; ok {
+ text = string(r)
+ haveText = true
+ } else if p.Entity != nil {
+ text, haveText = p.Entity[s]
+ }
+ }
+ if !haveText {
+ if !p.Strict {
+ b0, b1 = 0, 0
+ p.buf.WriteByte('&')
+ p.buf.Write(p.tmp[0:i])
+ continue Input
+ }
+ p.err = p.syntaxError("invalid character entity &" + s + ";")
+ return nil
+ }
+ p.buf.Write([]byte(text))
+ b0, b1 = 0, 0
+ continue Input
+ }
+ p.buf.WriteByte(b)
+ b0, b1 = b1, b
+ }
+ data := p.buf.Bytes()
+ data = data[0 : len(data)-trunc]
+
+ // Inspect each rune for being a disallowed character.
+ buf := data
+ for len(buf) > 0 {
+ r, size := utf8.DecodeRune(buf)
+ if r == utf8.RuneError && size == 1 {
+ p.err = p.syntaxError("invalid UTF-8")
+ return nil
+ }
+ buf = buf[size:]
+ if !isInCharacterRange(r) {
+ p.err = p.syntaxError(fmt.Sprintf("illegal character code %U", r))
+ return nil
+ }
+ }
+
+ // Must rewrite \r and \r\n into \n.
+ w := 0
+ for r := 0; r < len(data); r++ {
+ b := data[r]
+ if b == '\r' {
+ if r+1 < len(data) && data[r+1] == '\n' {
+ continue
+ }
+ b = '\n'
+ }
+ data[w] = b
+ w++
+ }
+ return data[0:w]
+}
+
+// Decide whether the given rune is in the XML Character Range, per
+// the Char production of http://www.xml.com/axml/testaxml.htm,
+// Section 2.2 Characters.
+func isInCharacterRange(rune int) (inrange bool) {
+ return rune == 0x09 ||
+ rune == 0x0A ||
+ rune == 0x0D ||
+ rune >= 0x20 && rune <= 0xDF77 ||
+ rune >= 0xE000 && rune <= 0xFFFD ||
+ rune >= 0x10000 && rune <= 0x10FFFF
+}
+
+// Get name space name: name with a : stuck in the middle.
+// The part before the : is the name space identifier.
+func (p *Parser) nsname() (name Name, ok bool) {
+ s, ok := p.name()
+ if !ok {
+ return
+ }
+ i := strings.Index(s, ":")
+ if i < 0 {
+ name.Local = s
+ } else {
+ name.Space = s[0:i]
+ name.Local = s[i+1:]
+ }
+ return name, true
+}
+
+// Get name: /first(first|second)*/
+// Do not set p.err if the name is missing (unless unexpected EOF is received):
+// let the caller provide better context.
+func (p *Parser) name() (s string, ok bool) {
+ var b byte
+ if b, ok = p.mustgetc(); !ok {
+ return
+ }
+
+ // As a first approximation, we gather the bytes [A-Za-z_:.-\x80-\xFF]*
+ if b < utf8.RuneSelf && !isNameByte(b) {
+ p.ungetc(b)
+ return "", false
+ }
+ p.buf.Reset()
+ p.buf.WriteByte(b)
+ for {
+ if b, ok = p.mustgetc(); !ok {
+ return
+ }
+ if b < utf8.RuneSelf && !isNameByte(b) {
+ p.ungetc(b)
+ break
+ }
+ p.buf.WriteByte(b)
+ }
+
+ // Then we check the characters.
+ s = p.buf.String()
+ for i, c := range s {
+ if !unicode.Is(first, c) && (i == 0 || !unicode.Is(second, c)) {
+ p.err = p.syntaxError("invalid XML name: " + s)
+ return "", false
+ }
+ }
+ return s, true
+}
+
+func isNameByte(c byte) bool {
+ return 'A' <= c && c <= 'Z' ||
+ 'a' <= c && c <= 'z' ||
+ '0' <= c && c <= '9' ||
+ c == '_' || c == ':' || c == '.' || c == '-'
+}
+
+// These tables were generated by cut and paste from Appendix B of
+// the XML spec at http://www.xml.com/axml/testaxml.htm
+// and then reformatting. First corresponds to (Letter | '_' | ':')
+// and second corresponds to NameChar.
+
+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},
+ },
+}
+
+// HTMLEntity is an entity map containing translations for the
+// standard HTML entity characters.
+var HTMLEntity = htmlEntity
+
+var htmlEntity = map[string]string{
+ /*
+ hget http://www.w3.org/TR/html4/sgml/entities.html |
+ ssam '
+ ,y /\&gt;/ x/\&lt;(.|\n)+/ s/\n/ /g
+ ,x v/^\&lt;!ENTITY/d
+ ,s/\&lt;!ENTITY ([^ ]+) .*U\+([0-9A-F][0-9A-F][0-9A-F][0-9A-F]) .+/ "\1": "\\u\2",/g
+ '
+ */
+ "nbsp": "\u00A0",
+ "iexcl": "\u00A1",
+ "cent": "\u00A2",
+ "pound": "\u00A3",
+ "curren": "\u00A4",
+ "yen": "\u00A5",
+ "brvbar": "\u00A6",
+ "sect": "\u00A7",
+ "uml": "\u00A8",
+ "copy": "\u00A9",
+ "ordf": "\u00AA",
+ "laquo": "\u00AB",
+ "not": "\u00AC",
+ "shy": "\u00AD",
+ "reg": "\u00AE",
+ "macr": "\u00AF",
+ "deg": "\u00B0",
+ "plusmn": "\u00B1",
+ "sup2": "\u00B2",
+ "sup3": "\u00B3",
+ "acute": "\u00B4",
+ "micro": "\u00B5",
+ "para": "\u00B6",
+ "middot": "\u00B7",
+ "cedil": "\u00B8",
+ "sup1": "\u00B9",
+ "ordm": "\u00BA",
+ "raquo": "\u00BB",
+ "frac14": "\u00BC",
+ "frac12": "\u00BD",
+ "frac34": "\u00BE",
+ "iquest": "\u00BF",
+ "Agrave": "\u00C0",
+ "Aacute": "\u00C1",
+ "Acirc": "\u00C2",
+ "Atilde": "\u00C3",
+ "Auml": "\u00C4",
+ "Aring": "\u00C5",
+ "AElig": "\u00C6",
+ "Ccedil": "\u00C7",
+ "Egrave": "\u00C8",
+ "Eacute": "\u00C9",
+ "Ecirc": "\u00CA",
+ "Euml": "\u00CB",
+ "Igrave": "\u00CC",
+ "Iacute": "\u00CD",
+ "Icirc": "\u00CE",
+ "Iuml": "\u00CF",
+ "ETH": "\u00D0",
+ "Ntilde": "\u00D1",
+ "Ograve": "\u00D2",
+ "Oacute": "\u00D3",
+ "Ocirc": "\u00D4",
+ "Otilde": "\u00D5",
+ "Ouml": "\u00D6",
+ "times": "\u00D7",
+ "Oslash": "\u00D8",
+ "Ugrave": "\u00D9",
+ "Uacute": "\u00DA",
+ "Ucirc": "\u00DB",
+ "Uuml": "\u00DC",
+ "Yacute": "\u00DD",
+ "THORN": "\u00DE",
+ "szlig": "\u00DF",
+ "agrave": "\u00E0",
+ "aacute": "\u00E1",
+ "acirc": "\u00E2",
+ "atilde": "\u00E3",
+ "auml": "\u00E4",
+ "aring": "\u00E5",
+ "aelig": "\u00E6",
+ "ccedil": "\u00E7",
+ "egrave": "\u00E8",
+ "eacute": "\u00E9",
+ "ecirc": "\u00EA",
+ "euml": "\u00EB",
+ "igrave": "\u00EC",
+ "iacute": "\u00ED",
+ "icirc": "\u00EE",
+ "iuml": "\u00EF",
+ "eth": "\u00F0",
+ "ntilde": "\u00F1",
+ "ograve": "\u00F2",
+ "oacute": "\u00F3",
+ "ocirc": "\u00F4",
+ "otilde": "\u00F5",
+ "ouml": "\u00F6",
+ "divide": "\u00F7",
+ "oslash": "\u00F8",
+ "ugrave": "\u00F9",
+ "uacute": "\u00FA",
+ "ucirc": "\u00FB",
+ "uuml": "\u00FC",
+ "yacute": "\u00FD",
+ "thorn": "\u00FE",
+ "yuml": "\u00FF",
+ "fnof": "\u0192",
+ "Alpha": "\u0391",
+ "Beta": "\u0392",
+ "Gamma": "\u0393",
+ "Delta": "\u0394",
+ "Epsilon": "\u0395",
+ "Zeta": "\u0396",
+ "Eta": "\u0397",
+ "Theta": "\u0398",
+ "Iota": "\u0399",
+ "Kappa": "\u039A",
+ "Lambda": "\u039B",
+ "Mu": "\u039C",
+ "Nu": "\u039D",
+ "Xi": "\u039E",
+ "Omicron": "\u039F",
+ "Pi": "\u03A0",
+ "Rho": "\u03A1",
+ "Sigma": "\u03A3",
+ "Tau": "\u03A4",
+ "Upsilon": "\u03A5",
+ "Phi": "\u03A6",
+ "Chi": "\u03A7",
+ "Psi": "\u03A8",
+ "Omega": "\u03A9",
+ "alpha": "\u03B1",
+ "beta": "\u03B2",
+ "gamma": "\u03B3",
+ "delta": "\u03B4",
+ "epsilon": "\u03B5",
+ "zeta": "\u03B6",
+ "eta": "\u03B7",
+ "theta": "\u03B8",
+ "iota": "\u03B9",
+ "kappa": "\u03BA",
+ "lambda": "\u03BB",
+ "mu": "\u03BC",
+ "nu": "\u03BD",
+ "xi": "\u03BE",
+ "omicron": "\u03BF",
+ "pi": "\u03C0",
+ "rho": "\u03C1",
+ "sigmaf": "\u03C2",
+ "sigma": "\u03C3",
+ "tau": "\u03C4",
+ "upsilon": "\u03C5",
+ "phi": "\u03C6",
+ "chi": "\u03C7",
+ "psi": "\u03C8",
+ "omega": "\u03C9",
+ "thetasym": "\u03D1",
+ "upsih": "\u03D2",
+ "piv": "\u03D6",
+ "bull": "\u2022",
+ "hellip": "\u2026",
+ "prime": "\u2032",
+ "Prime": "\u2033",
+ "oline": "\u203E",
+ "frasl": "\u2044",
+ "weierp": "\u2118",
+ "image": "\u2111",
+ "real": "\u211C",
+ "trade": "\u2122",
+ "alefsym": "\u2135",
+ "larr": "\u2190",
+ "uarr": "\u2191",
+ "rarr": "\u2192",
+ "darr": "\u2193",
+ "harr": "\u2194",
+ "crarr": "\u21B5",
+ "lArr": "\u21D0",
+ "uArr": "\u21D1",
+ "rArr": "\u21D2",
+ "dArr": "\u21D3",
+ "hArr": "\u21D4",
+ "forall": "\u2200",
+ "part": "\u2202",
+ "exist": "\u2203",
+ "empty": "\u2205",
+ "nabla": "\u2207",
+ "isin": "\u2208",
+ "notin": "\u2209",
+ "ni": "\u220B",
+ "prod": "\u220F",
+ "sum": "\u2211",
+ "minus": "\u2212",
+ "lowast": "\u2217",
+ "radic": "\u221A",
+ "prop": "\u221D",
+ "infin": "\u221E",
+ "ang": "\u2220",
+ "and": "\u2227",
+ "or": "\u2228",
+ "cap": "\u2229",
+ "cup": "\u222A",
+ "int": "\u222B",
+ "there4": "\u2234",
+ "sim": "\u223C",
+ "cong": "\u2245",
+ "asymp": "\u2248",
+ "ne": "\u2260",
+ "equiv": "\u2261",
+ "le": "\u2264",
+ "ge": "\u2265",
+ "sub": "\u2282",
+ "sup": "\u2283",
+ "nsub": "\u2284",
+ "sube": "\u2286",
+ "supe": "\u2287",
+ "oplus": "\u2295",
+ "otimes": "\u2297",
+ "perp": "\u22A5",
+ "sdot": "\u22C5",
+ "lceil": "\u2308",
+ "rceil": "\u2309",
+ "lfloor": "\u230A",
+ "rfloor": "\u230B",
+ "lang": "\u2329",
+ "rang": "\u232A",
+ "loz": "\u25CA",
+ "spades": "\u2660",
+ "clubs": "\u2663",
+ "hearts": "\u2665",
+ "diams": "\u2666",
+ "quot": "\u0022",
+ "amp": "\u0026",
+ "lt": "\u003C",
+ "gt": "\u003E",
+ "OElig": "\u0152",
+ "oelig": "\u0153",
+ "Scaron": "\u0160",
+ "scaron": "\u0161",
+ "Yuml": "\u0178",
+ "circ": "\u02C6",
+ "tilde": "\u02DC",
+ "ensp": "\u2002",
+ "emsp": "\u2003",
+ "thinsp": "\u2009",
+ "zwnj": "\u200C",
+ "zwj": "\u200D",
+ "lrm": "\u200E",
+ "rlm": "\u200F",
+ "ndash": "\u2013",
+ "mdash": "\u2014",
+ "lsquo": "\u2018",
+ "rsquo": "\u2019",
+ "sbquo": "\u201A",
+ "ldquo": "\u201C",
+ "rdquo": "\u201D",
+ "bdquo": "\u201E",
+ "dagger": "\u2020",
+ "Dagger": "\u2021",
+ "permil": "\u2030",
+ "lsaquo": "\u2039",
+ "rsaquo": "\u203A",
+ "euro": "\u20AC",
+}
+
+// HTMLAutoClose is the set of HTML elements that
+// should be considered to close automatically.
+var HTMLAutoClose = htmlAutoClose
+
+var htmlAutoClose = []string{
+ /*
+ hget http://www.w3.org/TR/html4/loose.dtd |
+ 9 sed -n 's/<!ELEMENT (.*) - O EMPTY.+/ "\1",/p' | tr A-Z a-z
+ */
+ "basefont",
+ "br",
+ "area",
+ "link",
+ "img",
+ "param",
+ "hr",
+ "input",
+ "col ",
+ "frame",
+ "isindex",
+ "base",
+ "meta",
+}
+
+var (
+ esc_quot = []byte("&#34;") // shorter than "&quot;"
+ esc_apos = []byte("&#39;") // shorter than "&apos;"
+ esc_amp = []byte("&amp;")
+ esc_lt = []byte("&lt;")
+ esc_gt = []byte("&gt;")
+)
+
+// Escape writes to w the properly escaped XML equivalent
+// of the plain text data s.
+func Escape(w io.Writer, s []byte) {
+ var esc []byte
+ last := 0
+ for i, c := range s {
+ switch c {
+ case '"':
+ esc = esc_quot
+ case '\'':
+ esc = esc_apos
+ case '&':
+ esc = esc_amp
+ case '<':
+ esc = esc_lt
+ case '>':
+ esc = esc_gt
+ default:
+ continue
+ }
+ w.Write(s[last:i])
+ w.Write(esc)
+ last = i + 1
+ }
+ w.Write(s[last:])
+}
+
+// procInstEncoding parses the `encoding="..."` or `encoding='...'`
+// value out of the provided string, returning "" if not found.
+func procInstEncoding(s string) string {
+ // TODO: this parsing is somewhat lame and not exact.
+ // It works for all actual cases, though.
+ idx := strings.Index(s, "encoding=")
+ if idx == -1 {
+ return ""
+ }
+ v := s[idx+len("encoding="):]
+ if v == "" {
+ return ""
+ }
+ if v[0] != '\'' && v[0] != '"' {
+ return ""
+ }
+ idx = strings.IndexRune(v[1:], int(v[0]))
+ if idx == -1 {
+ return ""
+ }
+ return v[1 : idx+1]
+}
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 00:58:37 +0000