forked from JoshVarga/svgparser
/
parser.go
97 lines (82 loc) · 1.83 KB
/
parser.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
package svgparser
import (
"bytes"
"encoding/xml"
"io"
"io/ioutil"
"strings"
"golang.org/x/net/html/charset"
)
// ValidationError contains errors which have occured when parsing svg input.
type ValidationError struct {
msg string
}
func (err ValidationError) Error() string {
return err.msg
}
// DecodeFirst creates the first element from the decoder.
func DecodeFirst(decoder *xml.Decoder) (*Element, error) {
for {
token, err := decoder.Token()
if token == nil && err == io.EOF {
break
}
if err != nil {
return nil, err
}
switch element := token.(type) {
case xml.StartElement:
return NewElement(element), nil
}
}
return &Element{}, nil
}
// Decode decodes the child elements of element.
func (e *Element) Decode(decoder *xml.Decoder) error {
for {
token, err := decoder.Token()
if token == nil && err == io.EOF {
break
}
if err != nil {
return err
}
switch element := token.(type) {
case xml.StartElement:
nextElement := NewElement(element)
err := nextElement.Decode(decoder)
if err != nil {
return err
}
nextElement.Parent = e
e.Children = append(e.Children, nextElement)
case xml.CharData:
data := strings.TrimSpace(string(element))
if data != "" {
e.Content = string(element)
}
case xml.EndElement:
if element.Name.Local == e.Name {
return nil
}
}
}
return nil
}
// Parse creates an Element instance from an SVG input.
func Parse(source io.Reader, validate bool) (*Element, error) {
raw, err := ioutil.ReadAll(source)
if err != nil {
return nil, err
}
decoder := xml.NewDecoder(bytes.NewReader(raw))
decoder.CharsetReader = charset.NewReaderLabel
element, err := DecodeFirst(decoder)
if err != nil {
return nil, err
}
if err := element.Decode(decoder); err != nil && err != io.EOF {
return nil, err
}
return element, nil
}