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1999 lines
45 KiB
Go
1999 lines
45 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package xml implements a simple XML 1.0 parser that
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// understands XML name spaces.
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package xml
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// References:
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// Annotated XML spec: http://www.xml.com/axml/testaxml.htm
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// XML name spaces: http://www.w3.org/TR/REC-xml-names/
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// TODO(rsc):
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// Test error handling.
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"strconv"
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"strings"
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"unicode"
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"unicode/utf8"
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)
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// A SyntaxError represents a syntax error in the XML input stream.
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type SyntaxError struct {
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Msg string
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Line int
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}
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func (e *SyntaxError) Error() string {
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return "XML syntax error on line " + strconv.Itoa(e.Line) + ": " + e.Msg
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}
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// A Name represents an XML name (Local) annotated with a name space
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// identifier (Space). In tokens returned by Decoder.Token, the Space
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// identifier is given as a canonical URL, not the short prefix used in
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// the document being parsed.
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//
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// As a special case, XML namespace declarations will use the literal
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// string "xmlns" for the Space field instead of the fully resolved URL.
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// See Encoder.EncodeToken for more information on namespace encoding
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// behaviour.
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type Name struct {
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Space, Local string
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}
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// isNamespace reports whether the name is a namespace-defining name.
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func (name Name) isNamespace() bool {
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return name.Local == "xmlns" || name.Space == "xmlns"
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}
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// An Attr represents an attribute in an XML element (Name=Value).
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type Attr struct {
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Name Name
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Value string
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}
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// A Token is an interface holding one of the token types:
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// StartElement, EndElement, CharData, Comment, ProcInst, or Directive.
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type Token interface{}
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// A StartElement represents an XML start element.
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type StartElement struct {
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Name Name
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Attr []Attr
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}
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func (e StartElement) Copy() StartElement {
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attrs := make([]Attr, len(e.Attr))
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copy(attrs, e.Attr)
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e.Attr = attrs
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return e
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}
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// End returns the corresponding XML end element.
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func (e StartElement) End() EndElement {
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return EndElement{e.Name}
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}
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// setDefaultNamespace sets the namespace of the element
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// as the default for all elements contained within it.
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func (e *StartElement) setDefaultNamespace() {
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if e.Name.Space == "" {
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// If there's no namespace on the element, don't
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// set the default. Strictly speaking this might be wrong, as
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// we can't tell if the element had no namespace set
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// or was just using the default namespace.
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return
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}
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// Don't add a default name space if there's already one set.
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for _, attr := range e.Attr {
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if attr.Name.Space == "" && attr.Name.Local == "xmlns" {
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return
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}
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}
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e.Attr = append(e.Attr, Attr{
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Name: Name{
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Local: "xmlns",
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},
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Value: e.Name.Space,
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})
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}
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// An EndElement represents an XML end element.
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type EndElement struct {
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Name Name
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}
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// A CharData represents XML character data (raw text),
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// in which XML escape sequences have been replaced by
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// the characters they represent.
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type CharData []byte
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func makeCopy(b []byte) []byte {
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b1 := make([]byte, len(b))
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copy(b1, b)
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return b1
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}
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func (c CharData) Copy() CharData { return CharData(makeCopy(c)) }
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// A Comment represents an XML comment of the form <!--comment-->.
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// The bytes do not include the <!-- and --> comment markers.
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type Comment []byte
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func (c Comment) Copy() Comment { return Comment(makeCopy(c)) }
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// A ProcInst represents an XML processing instruction of the form <?target inst?>
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type ProcInst struct {
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Target string
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Inst []byte
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}
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func (p ProcInst) Copy() ProcInst {
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p.Inst = makeCopy(p.Inst)
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return p
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}
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// A Directive represents an XML directive of the form <!text>.
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// The bytes do not include the <! and > markers.
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type Directive []byte
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func (d Directive) Copy() Directive { return Directive(makeCopy(d)) }
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// CopyToken returns a copy of a Token.
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func CopyToken(t Token) Token {
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switch v := t.(type) {
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case CharData:
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return v.Copy()
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case Comment:
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return v.Copy()
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case Directive:
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return v.Copy()
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case ProcInst:
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return v.Copy()
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case StartElement:
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return v.Copy()
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}
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return t
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}
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// A Decoder represents an XML parser reading a particular input stream.
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// The parser assumes that its input is encoded in UTF-8.
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type Decoder struct {
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// Strict defaults to true, enforcing the requirements
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// of the XML specification.
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// If set to false, the parser allows input containing common
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// mistakes:
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// * If an element is missing an end tag, the parser invents
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// end tags as necessary to keep the return values from Token
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// properly balanced.
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// * In attribute values and character data, unknown or malformed
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// character entities (sequences beginning with &) are left alone.
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//
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// Setting:
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//
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// d.Strict = false;
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// d.AutoClose = HTMLAutoClose;
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// d.Entity = HTMLEntity
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//
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// creates a parser that can handle typical HTML.
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//
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// Strict mode does not enforce the requirements of the XML name spaces TR.
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// In particular it does not reject name space tags using undefined prefixes.
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// Such tags are recorded with the unknown prefix as the name space URL.
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Strict bool
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// When Strict == false, AutoClose indicates a set of elements to
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// consider closed immediately after they are opened, regardless
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// of whether an end element is present.
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AutoClose []string
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// Entity can be used to map non-standard entity names to string replacements.
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// The parser behaves as if these standard mappings are present in the map,
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// regardless of the actual map content:
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//
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// "lt": "<",
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// "gt": ">",
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// "amp": "&",
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// "apos": "'",
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// "quot": `"`,
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Entity map[string]string
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// CharsetReader, if non-nil, defines a function to generate
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// charset-conversion readers, converting from the provided
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// non-UTF-8 charset into UTF-8. If CharsetReader is nil or
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// returns an error, parsing stops with an error. One of the
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// the CharsetReader's result values must be non-nil.
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CharsetReader func(charset string, input io.Reader) (io.Reader, error)
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// DefaultSpace sets the default name space used for unadorned tags,
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// as if the entire XML stream were wrapped in an element containing
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// the attribute xmlns="DefaultSpace".
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DefaultSpace string
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r io.ByteReader
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buf bytes.Buffer
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saved *bytes.Buffer
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stk *stack
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free *stack
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needClose bool
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toClose Name
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nextToken Token
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nextByte int
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ns map[string]string
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err error
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line int
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offset int64
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unmarshalDepth int
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}
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// NewDecoder creates a new XML parser reading from r.
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// If r does not implement io.ByteReader, NewDecoder will
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// do its own buffering.
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func NewDecoder(r io.Reader) *Decoder {
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d := &Decoder{
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ns: make(map[string]string),
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nextByte: -1,
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line: 1,
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Strict: true,
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}
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d.switchToReader(r)
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return d
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}
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// Token returns the next XML token in the input stream.
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// At the end of the input stream, Token returns nil, io.EOF.
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//
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// Slices of bytes in the returned token data refer to the
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// parser's internal buffer and remain valid only until the next
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// call to Token. To acquire a copy of the bytes, call CopyToken
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// or the token's Copy method.
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//
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// Token expands self-closing elements such as <br/>
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// into separate start and end elements returned by successive calls.
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//
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// Token guarantees that the StartElement and EndElement
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// tokens it returns are properly nested and matched:
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// if Token encounters an unexpected end element,
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// it will return an error.
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//
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// Token implements XML name spaces as described by
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// http://www.w3.org/TR/REC-xml-names/. Each of the
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// Name structures contained in the Token has the Space
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// set to the URL identifying its name space when known.
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// If Token encounters an unrecognized name space prefix,
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// it uses the prefix as the Space rather than report an error.
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func (d *Decoder) Token() (t Token, err error) {
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if d.stk != nil && d.stk.kind == stkEOF {
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err = io.EOF
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return
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}
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if d.nextToken != nil {
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t = d.nextToken
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d.nextToken = nil
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} else if t, err = d.rawToken(); err != nil {
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return
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}
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if !d.Strict {
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if t1, ok := d.autoClose(t); ok {
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d.nextToken = t
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t = t1
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}
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}
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switch t1 := t.(type) {
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case StartElement:
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// In XML name spaces, the translations listed in the
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// attributes apply to the element name and
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// to the other attribute names, so process
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// the translations first.
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for _, a := range t1.Attr {
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if a.Name.Space == "xmlns" {
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v, ok := d.ns[a.Name.Local]
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d.pushNs(a.Name.Local, v, ok)
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d.ns[a.Name.Local] = a.Value
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}
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if a.Name.Space == "" && a.Name.Local == "xmlns" {
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// Default space for untagged names
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v, ok := d.ns[""]
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d.pushNs("", v, ok)
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d.ns[""] = a.Value
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}
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}
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d.translate(&t1.Name, true)
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for i := range t1.Attr {
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d.translate(&t1.Attr[i].Name, false)
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}
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d.pushElement(t1.Name)
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t = t1
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case EndElement:
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d.translate(&t1.Name, true)
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if !d.popElement(&t1) {
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return nil, d.err
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}
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t = t1
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}
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return
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}
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const xmlURL = "http://www.w3.org/XML/1998/namespace"
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// Apply name space translation to name n.
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// The default name space (for Space=="")
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// applies only to element names, not to attribute names.
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func (d *Decoder) translate(n *Name, isElementName bool) {
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switch {
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case n.Space == "xmlns":
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return
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case n.Space == "" && !isElementName:
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return
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case n.Space == "xml":
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n.Space = xmlURL
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case n.Space == "" && n.Local == "xmlns":
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return
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}
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if v, ok := d.ns[n.Space]; ok {
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n.Space = v
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} else if n.Space == "" {
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n.Space = d.DefaultSpace
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}
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}
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func (d *Decoder) switchToReader(r io.Reader) {
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// Get efficient byte at a time reader.
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// Assume that if reader has its own
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// ReadByte, it's efficient enough.
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// Otherwise, use bufio.
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if rb, ok := r.(io.ByteReader); ok {
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d.r = rb
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} else {
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d.r = bufio.NewReader(r)
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}
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}
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// Parsing state - stack holds old name space translations
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// and the current set of open elements. The translations to pop when
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// ending a given tag are *below* it on the stack, which is
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// more work but forced on us by XML.
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type stack struct {
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next *stack
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kind int
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name Name
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ok bool
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}
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const (
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stkStart = iota
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stkNs
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stkEOF
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)
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func (d *Decoder) push(kind int) *stack {
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s := d.free
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if s != nil {
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d.free = s.next
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} else {
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s = new(stack)
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}
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s.next = d.stk
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s.kind = kind
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d.stk = s
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return s
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}
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func (d *Decoder) pop() *stack {
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s := d.stk
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if s != nil {
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d.stk = s.next
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s.next = d.free
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d.free = s
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}
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return s
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}
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// Record that after the current element is finished
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// (that element is already pushed on the stack)
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// Token should return EOF until popEOF is called.
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func (d *Decoder) pushEOF() {
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// Walk down stack to find Start.
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// It might not be the top, because there might be stkNs
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// entries above it.
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start := d.stk
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for start.kind != stkStart {
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start = start.next
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}
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// The stkNs entries below a start are associated with that
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// element too; skip over them.
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for start.next != nil && start.next.kind == stkNs {
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start = start.next
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}
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s := d.free
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if s != nil {
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d.free = s.next
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} else {
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s = new(stack)
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}
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s.kind = stkEOF
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s.next = start.next
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start.next = s
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}
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// Undo a pushEOF.
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// The element must have been finished, so the EOF should be at the top of the stack.
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func (d *Decoder) popEOF() bool {
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if d.stk == nil || d.stk.kind != stkEOF {
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return false
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}
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d.pop()
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return true
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}
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// Record that we are starting an element with the given name.
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func (d *Decoder) pushElement(name Name) {
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s := d.push(stkStart)
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s.name = name
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}
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// Record that we are changing the value of ns[local].
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// The old value is url, ok.
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func (d *Decoder) pushNs(local string, url string, ok bool) {
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s := d.push(stkNs)
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s.name.Local = local
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s.name.Space = url
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s.ok = ok
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}
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// Creates a SyntaxError with the current line number.
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func (d *Decoder) syntaxError(msg string) error {
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return &SyntaxError{Msg: msg, Line: d.line}
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}
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// Record that we are ending an element with the given name.
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// The name must match the record at the top of the stack,
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// which must be a pushElement record.
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// After popping the element, apply any undo records from
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// the stack to restore the name translations that existed
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// before we saw this element.
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func (d *Decoder) popElement(t *EndElement) bool {
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s := d.pop()
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name := t.Name
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switch {
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case s == nil || s.kind != stkStart:
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d.err = d.syntaxError("unexpected end element </" + name.Local + ">")
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return false
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case s.name.Local != name.Local:
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if !d.Strict {
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d.needClose = true
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d.toClose = t.Name
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t.Name = s.name
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return true
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}
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d.err = d.syntaxError("element <" + s.name.Local + "> closed by </" + name.Local + ">")
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return false
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case s.name.Space != name.Space:
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d.err = d.syntaxError("element <" + s.name.Local + "> in space " + s.name.Space +
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"closed by </" + name.Local + "> in space " + name.Space)
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return false
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}
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// Pop stack until a Start or EOF is on the top, undoing the
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// translations that were associated with the element we just closed.
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for d.stk != nil && d.stk.kind != stkStart && d.stk.kind != stkEOF {
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s := d.pop()
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if s.ok {
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d.ns[s.name.Local] = s.name.Space
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} else {
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delete(d.ns, s.name.Local)
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}
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}
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return true
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}
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// If the top element on the stack is autoclosing and
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// t is not the end tag, invent the end tag.
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func (d *Decoder) autoClose(t Token) (Token, bool) {
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if d.stk == nil || d.stk.kind != stkStart {
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return nil, false
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}
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name := strings.ToLower(d.stk.name.Local)
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for _, s := range d.AutoClose {
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if strings.ToLower(s) == name {
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// This one should be auto closed if t doesn't close it.
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et, ok := t.(EndElement)
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if !ok || et.Name.Local != name {
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return EndElement{d.stk.name}, true
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}
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break
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}
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}
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return nil, false
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}
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var errRawToken = errors.New("xml: cannot use RawToken from UnmarshalXML method")
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// RawToken is like Token but does not verify that
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// start and end elements match and does not translate
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// name space prefixes to their corresponding URLs.
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func (d *Decoder) RawToken() (Token, error) {
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if d.unmarshalDepth > 0 {
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return nil, errRawToken
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}
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return d.rawToken()
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}
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func (d *Decoder) rawToken() (Token, error) {
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if d.err != nil {
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return nil, d.err
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}
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if d.needClose {
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// The last element we read was self-closing and
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// we returned just the StartElement half.
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// Return the EndElement half now.
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d.needClose = false
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return EndElement{d.toClose}, nil
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}
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b, ok := d.getc()
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if !ok {
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return nil, d.err
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}
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if b != '<' {
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// Text section.
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d.ungetc(b)
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data := d.text(-1, false)
|
|
if data == nil {
|
|
return nil, d.err
|
|
}
|
|
return CharData(data), nil
|
|
}
|
|
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
switch b {
|
|
case '/':
|
|
// </: End element
|
|
var name Name
|
|
if name, ok = d.nsname(); !ok {
|
|
if d.err == nil {
|
|
d.err = d.syntaxError("expected element name after </")
|
|
}
|
|
return nil, d.err
|
|
}
|
|
d.space()
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b != '>' {
|
|
d.err = d.syntaxError("invalid characters between </" + name.Local + " and >")
|
|
return nil, d.err
|
|
}
|
|
return EndElement{name}, nil
|
|
|
|
case '?':
|
|
// <?: Processing instruction.
|
|
var target string
|
|
if target, ok = d.name(); !ok {
|
|
if d.err == nil {
|
|
d.err = d.syntaxError("expected target name after <?")
|
|
}
|
|
return nil, d.err
|
|
}
|
|
d.space()
|
|
d.buf.Reset()
|
|
var b0 byte
|
|
for {
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
d.buf.WriteByte(b)
|
|
if b0 == '?' && b == '>' {
|
|
break
|
|
}
|
|
b0 = b
|
|
}
|
|
data := d.buf.Bytes()
|
|
data = data[0 : len(data)-2] // chop ?>
|
|
|
|
if target == "xml" {
|
|
content := string(data)
|
|
ver := procInst("version", content)
|
|
if ver != "" && ver != "1.0" {
|
|
d.err = fmt.Errorf("xml: unsupported version %q; only version 1.0 is supported", ver)
|
|
return nil, d.err
|
|
}
|
|
enc := procInst("encoding", content)
|
|
if enc != "" && enc != "utf-8" && enc != "UTF-8" {
|
|
if d.CharsetReader == nil {
|
|
d.err = fmt.Errorf("xml: encoding %q declared but Decoder.CharsetReader is nil", enc)
|
|
return nil, d.err
|
|
}
|
|
newr, err := d.CharsetReader(enc, d.r.(io.Reader))
|
|
if err != nil {
|
|
d.err = fmt.Errorf("xml: opening charset %q: %v", enc, err)
|
|
return nil, d.err
|
|
}
|
|
if newr == nil {
|
|
panic("CharsetReader returned a nil Reader for charset " + enc)
|
|
}
|
|
d.switchToReader(newr)
|
|
}
|
|
}
|
|
return ProcInst{target, data}, nil
|
|
|
|
case '!':
|
|
// <!: Maybe comment, maybe CDATA.
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
switch b {
|
|
case '-': // <!-
|
|
// Probably <!-- for a comment.
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b != '-' {
|
|
d.err = d.syntaxError("invalid sequence <!- not part of <!--")
|
|
return nil, d.err
|
|
}
|
|
// Look for terminator.
|
|
d.buf.Reset()
|
|
var b0, b1 byte
|
|
for {
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
d.buf.WriteByte(b)
|
|
if b0 == '-' && b1 == '-' && b == '>' {
|
|
break
|
|
}
|
|
b0, b1 = b1, b
|
|
}
|
|
data := d.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 = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b != "CDATA["[i] {
|
|
d.err = d.syntaxError("invalid <![ sequence")
|
|
return nil, d.err
|
|
}
|
|
}
|
|
// Have <![CDATA[. Read text until ]]>.
|
|
data := d.text(-1, true)
|
|
if data == nil {
|
|
return nil, d.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.
|
|
d.buf.Reset()
|
|
d.buf.WriteByte(b)
|
|
inquote := uint8(0)
|
|
depth := 0
|
|
for {
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if inquote == 0 && b == '>' && depth == 0 {
|
|
break
|
|
}
|
|
HandleB:
|
|
d.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:
|
|
// Look for <!-- to begin comment.
|
|
s := "!--"
|
|
for i := 0; i < len(s); i++ {
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b != s[i] {
|
|
for j := 0; j < i; j++ {
|
|
d.buf.WriteByte(s[j])
|
|
}
|
|
depth++
|
|
goto HandleB
|
|
}
|
|
}
|
|
|
|
// Remove < that was written above.
|
|
d.buf.Truncate(d.buf.Len() - 1)
|
|
|
|
// Look for terminator.
|
|
var b0, b1 byte
|
|
for {
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b0 == '-' && b1 == '-' && b == '>' {
|
|
break
|
|
}
|
|
b0, b1 = b1, b
|
|
}
|
|
}
|
|
}
|
|
return Directive(d.buf.Bytes()), nil
|
|
}
|
|
|
|
// Must be an open element like <a href="foo">
|
|
d.ungetc(b)
|
|
|
|
var (
|
|
name Name
|
|
empty bool
|
|
attr []Attr
|
|
)
|
|
if name, ok = d.nsname(); !ok {
|
|
if d.err == nil {
|
|
d.err = d.syntaxError("expected element name after <")
|
|
}
|
|
return nil, d.err
|
|
}
|
|
|
|
attr = []Attr{}
|
|
for {
|
|
d.space()
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b == '/' {
|
|
empty = true
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b != '>' {
|
|
d.err = d.syntaxError("expected /> in element")
|
|
return nil, d.err
|
|
}
|
|
break
|
|
}
|
|
if b == '>' {
|
|
break
|
|
}
|
|
d.ungetc(b)
|
|
|
|
n := len(attr)
|
|
if n >= cap(attr) {
|
|
nCap := 2 * cap(attr)
|
|
if nCap == 0 {
|
|
nCap = 4
|
|
}
|
|
nattr := make([]Attr, n, nCap)
|
|
copy(nattr, attr)
|
|
attr = nattr
|
|
}
|
|
attr = attr[0 : n+1]
|
|
a := &attr[n]
|
|
if a.Name, ok = d.nsname(); !ok {
|
|
if d.err == nil {
|
|
d.err = d.syntaxError("expected attribute name in element")
|
|
}
|
|
return nil, d.err
|
|
}
|
|
d.space()
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil, d.err
|
|
}
|
|
if b != '=' {
|
|
if d.Strict {
|
|
d.err = d.syntaxError("attribute name without = in element")
|
|
return nil, d.err
|
|
} else {
|
|
d.ungetc(b)
|
|
a.Value = a.Name.Local
|
|
}
|
|
} else {
|
|
d.space()
|
|
data := d.attrval()
|
|
if data == nil {
|
|
return nil, d.err
|
|
}
|
|
a.Value = string(data)
|
|
}
|
|
}
|
|
if empty {
|
|
d.needClose = true
|
|
d.toClose = name
|
|
}
|
|
return StartElement{name, attr}, nil
|
|
}
|
|
|
|
func (d *Decoder) attrval() []byte {
|
|
b, ok := d.mustgetc()
|
|
if !ok {
|
|
return nil
|
|
}
|
|
// Handle quoted attribute values
|
|
if b == '"' || b == '\'' {
|
|
return d.text(int(b), false)
|
|
}
|
|
// Handle unquoted attribute values for strict parsers
|
|
if d.Strict {
|
|
d.err = d.syntaxError("unquoted or missing attribute value in element")
|
|
return nil
|
|
}
|
|
// Handle unquoted attribute values for unstrict parsers
|
|
d.ungetc(b)
|
|
d.buf.Reset()
|
|
for {
|
|
b, ok = d.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 == '-' {
|
|
d.buf.WriteByte(b)
|
|
} else {
|
|
d.ungetc(b)
|
|
break
|
|
}
|
|
}
|
|
return d.buf.Bytes()
|
|
}
|
|
|
|
// Skip spaces if any
|
|
func (d *Decoder) space() {
|
|
for {
|
|
b, ok := d.getc()
|
|
if !ok {
|
|
return
|
|
}
|
|
switch b {
|
|
case ' ', '\r', '\n', '\t':
|
|
default:
|
|
d.ungetc(b)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read a single byte.
|
|
// If there is no byte to read, return ok==false
|
|
// and leave the error in d.err.
|
|
// Maintain line number.
|
|
func (d *Decoder) getc() (b byte, ok bool) {
|
|
if d.err != nil {
|
|
return 0, false
|
|
}
|
|
if d.nextByte >= 0 {
|
|
b = byte(d.nextByte)
|
|
d.nextByte = -1
|
|
} else {
|
|
b, d.err = d.r.ReadByte()
|
|
if d.err != nil {
|
|
return 0, false
|
|
}
|
|
if d.saved != nil {
|
|
d.saved.WriteByte(b)
|
|
}
|
|
}
|
|
if b == '\n' {
|
|
d.line++
|
|
}
|
|
d.offset++
|
|
return b, true
|
|
}
|
|
|
|
// InputOffset returns the input stream byte offset of the current decoder position.
|
|
// The offset gives the location of the end of the most recently returned token
|
|
// and the beginning of the next token.
|
|
func (d *Decoder) InputOffset() int64 {
|
|
return d.offset
|
|
}
|
|
|
|
// Return saved offset.
|
|
// If we did ungetc (nextByte >= 0), have to back up one.
|
|
func (d *Decoder) savedOffset() int {
|
|
n := d.saved.Len()
|
|
if d.nextByte >= 0 {
|
|
n--
|
|
}
|
|
return n
|
|
}
|
|
|
|
// Must read a single byte.
|
|
// If there is no byte to read,
|
|
// set d.err to SyntaxError("unexpected EOF")
|
|
// and return ok==false
|
|
func (d *Decoder) mustgetc() (b byte, ok bool) {
|
|
if b, ok = d.getc(); !ok {
|
|
if d.err == io.EOF {
|
|
d.err = d.syntaxError("unexpected EOF")
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// Unread a single byte.
|
|
func (d *Decoder) ungetc(b byte) {
|
|
if b == '\n' {
|
|
d.line--
|
|
}
|
|
d.nextByte = int(b)
|
|
d.offset--
|
|
}
|
|
|
|
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 d.err.
|
|
func (d *Decoder) text(quote int, cdata bool) []byte {
|
|
var b0, b1 byte
|
|
var trunc int
|
|
d.buf.Reset()
|
|
Input:
|
|
for {
|
|
b, ok := d.getc()
|
|
if !ok {
|
|
if cdata {
|
|
if d.err == io.EOF {
|
|
d.err = d.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
|
|
}
|
|
d.err = d.syntaxError("unescaped ]]> not in CDATA section")
|
|
return nil
|
|
}
|
|
|
|
// Stop reading text if we see a <.
|
|
if b == '<' && !cdata {
|
|
if quote >= 0 {
|
|
d.err = d.syntaxError("unescaped < inside quoted string")
|
|
return nil
|
|
}
|
|
d.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.
|
|
before := d.buf.Len()
|
|
d.buf.WriteByte('&')
|
|
var ok bool
|
|
var text string
|
|
var haveText bool
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil
|
|
}
|
|
if b == '#' {
|
|
d.buf.WriteByte(b)
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil
|
|
}
|
|
base := 10
|
|
if b == 'x' {
|
|
base = 16
|
|
d.buf.WriteByte(b)
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil
|
|
}
|
|
}
|
|
start := d.buf.Len()
|
|
for '0' <= b && b <= '9' ||
|
|
base == 16 && 'a' <= b && b <= 'f' ||
|
|
base == 16 && 'A' <= b && b <= 'F' {
|
|
d.buf.WriteByte(b)
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil
|
|
}
|
|
}
|
|
if b != ';' {
|
|
d.ungetc(b)
|
|
} else {
|
|
s := string(d.buf.Bytes()[start:])
|
|
d.buf.WriteByte(';')
|
|
n, err := strconv.ParseUint(s, base, 64)
|
|
if err == nil && n <= unicode.MaxRune {
|
|
text = string(n)
|
|
haveText = true
|
|
}
|
|
}
|
|
} else {
|
|
d.ungetc(b)
|
|
if !d.readName() {
|
|
if d.err != nil {
|
|
return nil
|
|
}
|
|
ok = false
|
|
}
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return nil
|
|
}
|
|
if b != ';' {
|
|
d.ungetc(b)
|
|
} else {
|
|
name := d.buf.Bytes()[before+1:]
|
|
d.buf.WriteByte(';')
|
|
if isName(name) {
|
|
s := string(name)
|
|
if r, ok := entity[s]; ok {
|
|
text = string(r)
|
|
haveText = true
|
|
} else if d.Entity != nil {
|
|
text, haveText = d.Entity[s]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if haveText {
|
|
d.buf.Truncate(before)
|
|
d.buf.Write([]byte(text))
|
|
b0, b1 = 0, 0
|
|
continue Input
|
|
}
|
|
if !d.Strict {
|
|
b0, b1 = 0, 0
|
|
continue Input
|
|
}
|
|
ent := string(d.buf.Bytes()[before:])
|
|
if ent[len(ent)-1] != ';' {
|
|
ent += " (no semicolon)"
|
|
}
|
|
d.err = d.syntaxError("invalid character entity " + ent)
|
|
return nil
|
|
}
|
|
|
|
// We must rewrite unescaped \r and \r\n into \n.
|
|
if b == '\r' {
|
|
d.buf.WriteByte('\n')
|
|
} else if b1 == '\r' && b == '\n' {
|
|
// Skip \r\n--we already wrote \n.
|
|
} else {
|
|
d.buf.WriteByte(b)
|
|
}
|
|
|
|
b0, b1 = b1, b
|
|
}
|
|
data := d.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 {
|
|
d.err = d.syntaxError("invalid UTF-8")
|
|
return nil
|
|
}
|
|
buf = buf[size:]
|
|
if !isInCharacterRange(r) {
|
|
d.err = d.syntaxError(fmt.Sprintf("illegal character code %U", r))
|
|
return nil
|
|
}
|
|
}
|
|
|
|
return data
|
|
}
|
|
|
|
// 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(r rune) (inrange bool) {
|
|
return r == 0x09 ||
|
|
r == 0x0A ||
|
|
r == 0x0D ||
|
|
r >= 0x20 && r <= 0xDF77 ||
|
|
r >= 0xE000 && r <= 0xFFFD ||
|
|
r >= 0x10000 && r <= 0x10FFFF
|
|
}
|
|
|
|
// Get name space name: name with a : stuck in the middle.
|
|
// The part before the : is the name space identifier.
|
|
func (d *Decoder) nsname() (name Name, ok bool) {
|
|
s, ok := d.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 d.err if the name is missing (unless unexpected EOF is received):
|
|
// let the caller provide better context.
|
|
func (d *Decoder) name() (s string, ok bool) {
|
|
d.buf.Reset()
|
|
if !d.readName() {
|
|
return "", false
|
|
}
|
|
|
|
// Now we check the characters.
|
|
b := d.buf.Bytes()
|
|
if !isName(b) {
|
|
d.err = d.syntaxError("invalid XML name: " + string(b))
|
|
return "", false
|
|
}
|
|
return string(b), true
|
|
}
|
|
|
|
// Read a name and append its bytes to d.buf.
|
|
// The name is delimited by any single-byte character not valid in names.
|
|
// All multi-byte characters are accepted; the caller must check their validity.
|
|
func (d *Decoder) readName() (ok bool) {
|
|
var b byte
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return
|
|
}
|
|
if b < utf8.RuneSelf && !isNameByte(b) {
|
|
d.ungetc(b)
|
|
return false
|
|
}
|
|
d.buf.WriteByte(b)
|
|
|
|
for {
|
|
if b, ok = d.mustgetc(); !ok {
|
|
return
|
|
}
|
|
if b < utf8.RuneSelf && !isNameByte(b) {
|
|
d.ungetc(b)
|
|
break
|
|
}
|
|
d.buf.WriteByte(b)
|
|
}
|
|
return true
|
|
}
|
|
|
|
func isNameByte(c byte) bool {
|
|
return 'A' <= c && c <= 'Z' ||
|
|
'a' <= c && c <= 'z' ||
|
|
'0' <= c && c <= '9' ||
|
|
c == '_' || c == ':' || c == '.' || c == '-'
|
|
}
|
|
|
|
func isName(s []byte) bool {
|
|
if len(s) == 0 {
|
|
return false
|
|
}
|
|
c, n := utf8.DecodeRune(s)
|
|
if c == utf8.RuneError && n == 1 {
|
|
return false
|
|
}
|
|
if !unicode.Is(first, c) {
|
|
return false
|
|
}
|
|
for n < len(s) {
|
|
s = s[n:]
|
|
c, n = utf8.DecodeRune(s)
|
|
if c == utf8.RuneError && n == 1 {
|
|
return false
|
|
}
|
|
if !unicode.Is(first, c) && !unicode.Is(second, c) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func isNameString(s string) bool {
|
|
if len(s) == 0 {
|
|
return false
|
|
}
|
|
c, n := utf8.DecodeRuneInString(s)
|
|
if c == utf8.RuneError && n == 1 {
|
|
return false
|
|
}
|
|
if !unicode.Is(first, c) {
|
|
return false
|
|
}
|
|
for n < len(s) {
|
|
s = s[n:]
|
|
c, n = utf8.DecodeRuneInString(s)
|
|
if c == utf8.RuneError && n == 1 {
|
|
return false
|
|
}
|
|
if !unicode.Is(first, c) && !unicode.Is(second, c) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// 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 /\>/ x/\<(.|\n)+/ s/\n/ /g
|
|
,x v/^\<!ENTITY/d
|
|
,s/\<!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(""") // shorter than """
|
|
esc_apos = []byte("'") // shorter than "'"
|
|
esc_amp = []byte("&")
|
|
esc_lt = []byte("<")
|
|
esc_gt = []byte(">")
|
|
esc_tab = []byte("	")
|
|
esc_nl = []byte("
")
|
|
esc_cr = []byte("
")
|
|
esc_fffd = []byte("\uFFFD") // Unicode replacement character
|
|
)
|
|
|
|
// EscapeText writes to w the properly escaped XML equivalent
|
|
// of the plain text data s.
|
|
func EscapeText(w io.Writer, s []byte) error {
|
|
return escapeText(w, s, true)
|
|
}
|
|
|
|
// escapeText writes to w the properly escaped XML equivalent
|
|
// of the plain text data s. If escapeNewline is true, newline
|
|
// characters will be escaped.
|
|
func escapeText(w io.Writer, s []byte, escapeNewline bool) error {
|
|
var esc []byte
|
|
last := 0
|
|
for i := 0; i < len(s); {
|
|
r, width := utf8.DecodeRune(s[i:])
|
|
i += width
|
|
switch r {
|
|
case '"':
|
|
esc = esc_quot
|
|
case '\'':
|
|
esc = esc_apos
|
|
case '&':
|
|
esc = esc_amp
|
|
case '<':
|
|
esc = esc_lt
|
|
case '>':
|
|
esc = esc_gt
|
|
case '\t':
|
|
esc = esc_tab
|
|
case '\n':
|
|
if !escapeNewline {
|
|
continue
|
|
}
|
|
esc = esc_nl
|
|
case '\r':
|
|
esc = esc_cr
|
|
default:
|
|
if !isInCharacterRange(r) || (r == 0xFFFD && width == 1) {
|
|
esc = esc_fffd
|
|
break
|
|
}
|
|
continue
|
|
}
|
|
if _, err := w.Write(s[last : i-width]); err != nil {
|
|
return err
|
|
}
|
|
if _, err := w.Write(esc); err != nil {
|
|
return err
|
|
}
|
|
last = i
|
|
}
|
|
if _, err := w.Write(s[last:]); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// EscapeString writes to p the properly escaped XML equivalent
|
|
// of the plain text data s.
|
|
func (p *printer) EscapeString(s string) {
|
|
var esc []byte
|
|
last := 0
|
|
for i := 0; i < len(s); {
|
|
r, width := utf8.DecodeRuneInString(s[i:])
|
|
i += width
|
|
switch r {
|
|
case '"':
|
|
esc = esc_quot
|
|
case '\'':
|
|
esc = esc_apos
|
|
case '&':
|
|
esc = esc_amp
|
|
case '<':
|
|
esc = esc_lt
|
|
case '>':
|
|
esc = esc_gt
|
|
case '\t':
|
|
esc = esc_tab
|
|
case '\n':
|
|
esc = esc_nl
|
|
case '\r':
|
|
esc = esc_cr
|
|
default:
|
|
if !isInCharacterRange(r) || (r == 0xFFFD && width == 1) {
|
|
esc = esc_fffd
|
|
break
|
|
}
|
|
continue
|
|
}
|
|
p.WriteString(s[last : i-width])
|
|
p.Write(esc)
|
|
last = i
|
|
}
|
|
p.WriteString(s[last:])
|
|
}
|
|
|
|
// Escape is like EscapeText but omits the error return value.
|
|
// It is provided for backwards compatibility with Go 1.0.
|
|
// Code targeting Go 1.1 or later should use EscapeText.
|
|
func Escape(w io.Writer, s []byte) {
|
|
EscapeText(w, s)
|
|
}
|
|
|
|
// procInst parses the `param="..."` or `param='...'`
|
|
// value out of the provided string, returning "" if not found.
|
|
func procInst(param, s string) string {
|
|
// TODO: this parsing is somewhat lame and not exact.
|
|
// It works for all actual cases, though.
|
|
param = param + "="
|
|
idx := strings.Index(s, param)
|
|
if idx == -1 {
|
|
return ""
|
|
}
|
|
v := s[idx+len(param):]
|
|
if v == "" {
|
|
return ""
|
|
}
|
|
if v[0] != '\'' && v[0] != '"' {
|
|
return ""
|
|
}
|
|
idx = strings.IndexRune(v[1:], rune(v[0]))
|
|
if idx == -1 {
|
|
return ""
|
|
}
|
|
return v[1 : idx+1]
|
|
}
|