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XML lexing

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The lexer is the bottom level.
Most clients will use the Unmarshal method,
not yet implemented, which will behave like
json.Unmarshal.

R=r
DELTA=1115  (766 added, 219 deleted, 130 changed)
OCL=35316
CL=35339
This commit is contained in:
Russ Cox 2009-10-05 15:00:50 -07:00
parent 2b1dbe8a4f
commit a91b6b74e3
2 changed files with 876 additions and 329 deletions
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1056
src/pkg/xml/xml.go
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149
src/pkg/xml/xml_test.go Normal file
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// 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
import (
"io";
"os";
"reflect";
"strings";
"testing";
)
const testInput = `
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<body xmlns:foo="ns1" xmlns="ns2" xmlns:tag="ns3" ` "\r\n\t" ` >
<hello lang="en">World &lt;&gt;&apos;&quot; &#x767d;&#40300;翔</hello>
<goodbye />
<outer foo:attr="value" xmlns:tag="ns4">
<inner/>
</outer>
<tag:name>
Some text here.
</tag:name>
</body><!-- missing final newline -->`
var rawTokens = []Token{
CharData(strings.Bytes("\n")),
ProcInst{"xml", strings.Bytes(`version="1.0" encoding="UTF-8"`)},
CharData(strings.Bytes("\n")),
Directive(strings.Bytes(`DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"`)),
CharData(strings.Bytes("\n")),
StartElement{Name{"", "body"}, []Attr{Attr{Name{"xmlns", "foo"}, "ns1"}, Attr{Name{"", "xmlns"}, "ns2"}, Attr{Name{"xmlns", "tag"}, "ns3"}}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"", "hello"}, []Attr{Attr{Name{"", "lang"}, "en"}}},
CharData(strings.Bytes("World <>'\" 白鵬翔")),
EndElement{Name{"", "hello"}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"", "goodbye"}, nil},
EndElement{Name{"", "goodbye"}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"", "outer"}, []Attr{Attr{Name{"foo", "attr"}, "value"}, Attr{Name{"xmlns", "tag"}, "ns4"}}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"", "inner"}, nil},
EndElement{Name{"", "inner"}},
CharData(strings.Bytes("\n ")),
EndElement{Name{"", "outer"}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"tag", "name"}, nil},
CharData(strings.Bytes("\n Some text here.\n ")),
EndElement{Name{"tag", "name"}},
CharData(strings.Bytes("\n")),
EndElement{Name{"", "body"}},
Comment(strings.Bytes(" missing final newline ")),
}
var cookedTokens = []Token{
CharData(strings.Bytes("\n")),
ProcInst{"xml", strings.Bytes(`version="1.0" encoding="UTF-8"`)},
CharData(strings.Bytes("\n")),
Directive(strings.Bytes(`DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"`)),
CharData(strings.Bytes("\n")),
StartElement{Name{"ns2", "body"}, []Attr{Attr{Name{"xmlns", "foo"}, "ns1"}, Attr{Name{"", "xmlns"}, "ns2"}, Attr{Name{"xmlns", "tag"}, "ns3"}}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"ns2", "hello"}, []Attr{Attr{Name{"", "lang"}, "en"}}},
CharData(strings.Bytes("World <>'\" 白鵬翔")),
EndElement{Name{"ns2", "hello"}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"ns2", "goodbye"}, nil},
EndElement{Name{"ns2", "goodbye"}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"ns2", "outer"}, []Attr{Attr{Name{"ns1", "attr"}, "value"}, Attr{Name{"xmlns", "tag"}, "ns4"}}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"ns2", "inner"}, nil},
EndElement{Name{"ns2", "inner"}},
CharData(strings.Bytes("\n ")),
EndElement{Name{"ns2", "outer"}},
CharData(strings.Bytes("\n ")),
StartElement{Name{"ns3", "name"}, nil},
CharData(strings.Bytes("\n Some text here.\n ")),
EndElement{Name{"ns3", "name"}},
CharData(strings.Bytes("\n")),
EndElement{Name{"ns2", "body"}},
Comment(strings.Bytes(" missing final newline ")),
}
type stringReader struct {
s string;
off int;
}
func (r *stringReader) Read(b []byte) (n int, err os.Error) {
if r.off >= len(r.s) {
return 0, os.EOF;
}
for r.off < len(r.s) && n < len(b) {
b[n] = r.s[r.off];
n++;
r.off++;
}
return;
}
func (r *stringReader) ReadByte() (b byte, err os.Error) {
if r.off >= len(r.s) {
return 0, os.EOF;
}
b = r.s[r.off];
r.off++;
return;
}
func StringReader(s string) io.Reader {
return &stringReader{s, 0}
}
func TestRawToken(t *testing.T) {
p := NewParser(StringReader(testInput));
for i, want := range rawTokens {
have, err := p.RawToken();
if err != nil {
t.Fatalf("token %d: unexpected error: %s", i, err);
}
if !reflect.DeepEqual(have, want) {
t.Errorf("token %d = %#v want %#v", i, have, want);
}
}
}
func TestToken(t *testing.T) {
p := NewParser(StringReader(testInput));
for i, want := range cookedTokens {
have, err := p.Token();
if err != nil {
t.Fatalf("token %d: unexpected error: %s", i, err);
}
if !reflect.DeepEqual(have, want) {
t.Errorf("token %d = %#v want %#v", i, have, want);
}
}
}