Repository navigation
Expand file tree
/
Copy pathsvg.go
More file actions
363 lines (338 loc) · 9.56 KB
/
Copy pathsvg.go
File metadata and controls
363 lines (338 loc) · 9.56 KB
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
// Package svg minifies SVG1.1 following the specifications at http://www.w3.org/TR/SVG11/.
package svg
import (
"bytes"
"io"
"github.com/tdewolff/minify/v2"
"github.com/tdewolff/minify/v2/css"
minifyXML "github.com/tdewolff/minify/v2/xml"
"github.com/tdewolff/parse/v2"
"github.com/tdewolff/parse/v2/buffer"
"github.com/tdewolff/parse/v2/xml"
)
var (
voidBytes = []byte("/>")
isBytes = []byte("=")
spaceBytes = []byte(" ")
cdataEndBytes = []byte("]]>")
zeroBytes = []byte("0")
svgStartTagBytes = []byte("<svg")
cssMimeBytes = []byte("text/css")
noneBytes = []byte("none")
urlBytes = []byte("url(")
xmlnsBytes = []byte("xmlns")
)
////////////////////////////////////////////////////////////////
// Minifier is an SVG minifier.
type Minifier struct {
KeepComments bool
Precision int // number of significant digits
KeepNamespaces []string
newPrecision int // precision for new numbers
inline bool
}
// Minify minifies SVG data, it reads from r and writes to w.
func Minify(m *minify.M, w io.Writer, r io.Reader, params map[string]string) error {
return (&Minifier{}).Minify(m, w, r, params)
}
// Minify minifies SVG data, it reads from r and writes to w.
func (o *Minifier) Minify(m *minify.M, w io.Writer, r io.Reader, params map[string]string) error {
tmp := &Minifier{}
*tmp = *o
o = tmp
o.newPrecision = o.Precision
if o.newPrecision <= 0 || 15 < o.newPrecision {
o.newPrecision = 15 // minimum number of digits a double can represent exactly
}
if !o.inline {
o.inline = params != nil && params["inline"] == "1"
}
// namespaces to keep
namespaces := [][]byte{[]byte("xlink")}
for _, ns := range o.KeepNamespaces {
namespaces = append(namespaces, []byte(ns))
}
var tag Hash
defaultStyleType := cssMimeBytes
defaultStyleParams := map[string]string(nil)
defaultInlineStyleParams := map[string]string{"inline": "1"}
p := NewPathData(o)
minifyBuffer := buffer.NewWriter(make([]byte, 0, 64))
attrByteBuffer := make([]byte, 0, 64)
z := parse.NewInput(r)
defer z.Restore()
l := xml.NewLexer(z)
tb := NewTokenBuffer(z, l)
for {
t := *tb.Shift()
switch t.TokenType {
case xml.ErrorToken:
if _, err := w.Write(nil); err != nil {
return err
}
if l.Err() == io.EOF {
return nil
}
return l.Err()
case xml.CommentToken:
if o.KeepComments {
w.Write(t.Data)
}
case xml.DOCTYPEToken:
if len(t.Text) > 0 && t.Text[len(t.Text)-1] == ']' {
w.Write(t.Data)
}
case xml.TextToken:
t.Data = parse.ReplaceMultipleWhitespaceAndEntities(t.Data, minifyXML.EntitiesMap, minifyXML.TextRevEntitiesMap)
t.Data = parse.TrimWhitespace(t.Data)
if tag == Style && len(t.Data) > 0 {
if err := m.MinifyMimetype(defaultStyleType, w, buffer.NewReader(t.Data), defaultStyleParams); err != nil {
if err != minify.ErrNotExist {
return minify.UpdateErrorPosition(err, z, t.Offset)
}
w.Write(t.Data)
}
} else {
w.Write(t.Data)
}
case xml.CDATAToken:
if tag == Style {
minifyBuffer.Reset()
if err := m.MinifyMimetype(defaultStyleType, minifyBuffer, buffer.NewReader(t.Text), defaultStyleParams); err == nil {
t.Data = append(t.Data[:9], minifyBuffer.Bytes()...)
t.Text = t.Data[9:]
t.Data = append(t.Data, cdataEndBytes...)
} else if err != minify.ErrNotExist {
return minify.UpdateErrorPosition(err, z, t.Offset)
}
}
var useText bool
if t.Text, useText = xml.EscapeCDATAVal(&attrByteBuffer, t.Text); useText {
t.Text = parse.ReplaceMultipleWhitespace(t.Text)
t.Text = parse.TrimWhitespace(t.Text)
w.Write(t.Text)
} else {
w.Write(t.Data)
}
case xml.StartTagPIToken:
for {
if t := *tb.Shift(); t.TokenType == xml.StartTagClosePIToken || t.TokenType == xml.ErrorToken {
break
}
}
case xml.StartTagToken:
tag = t.Hash
if tag == Metadata {
t.Data = nil
} else if colon := bytes.IndexByte(t.Text, ':'); colon != -1 {
prefix := ToHash(t.Text[:colon])
if prefix == Svg {
t.Data = append(t.Data[:1], t.Data[5:]...)
} else {
// skip attributes in namespace (eg. inkscape or sodipodi)
keep := false
for _, ns := range namespaces {
if bytes.Equal(t.Text[:colon], ns) {
keep = true
break
}
}
if !keep {
t.Data = nil
}
}
} else if tag == Defs && tb.Peek(1).TokenType == xml.StartTagCloseVoidToken {
// skip empty tags
t.Data = nil
}
if t.Data == nil {
skipTag(tb)
} else {
w.Write(t.Data)
}
case xml.AttributeToken:
if t.Text == nil { // data is nil when attribute has been removed
continue
}
attr := t.Hash
val := t.AttrVal
if n, m := parse.Dimension(val); n+m == len(val) && attr != Version { // TODO: inefficient, temporary measure
val, _ = o.shortenDimension(val)
}
if attr == Xml_Space && bytes.Equal(val, []byte("preserve")) ||
tag == Svg && (o.inline && attr == Xmlns ||
attr == Version && bytes.Equal(val, []byte("1.1")) ||
attr == X && bytes.Equal(val, zeroBytes) ||
attr == Y && bytes.Equal(val, zeroBytes) ||
attr == PreserveAspectRatio && bytes.Equal(val, []byte("xMidYMid meet")) ||
attr == BaseProfile && bytes.Equal(val, noneBytes) ||
attr == ContentScriptType && bytes.Equal(val, []byte("application/ecmascript")) ||
attr == ContentStyleType && bytes.Equal(val, cssMimeBytes)) ||
tag == Style && attr == Type && bytes.Equal(val, cssMimeBytes) {
continue
}
// skip attributes in namespace (eg. inkscape or sodipodi)
if colon := bytes.IndexByte(t.Text, ':'); colon != -1 {
keep := false
for _, ns := range namespaces {
if bytes.Equal(t.Text[:colon], ns) || tag == Svg && bytes.Equal(t.Text[:colon], xmlnsBytes) && bytes.Equal(ns, t.Text[colon+1:]) {
keep = true
break
}
}
if !keep {
continue
}
}
w.Write(spaceBytes)
w.Write(t.Text)
w.Write(isBytes)
if tag == Svg && attr == ContentStyleType {
val = minify.Mediatype(val)
defaultStyleType = val
} else if attr == Style {
minifyBuffer.Reset()
if err := m.MinifyMimetype(defaultStyleType, minifyBuffer, buffer.NewReader(val), defaultInlineStyleParams); err == nil {
val = minifyBuffer.Bytes()
} else if err != minify.ErrNotExist {
return minify.UpdateErrorPosition(err, z, t.Offset)
}
} else if attr == D {
val = p.ShortenPathData(val)
} else if attr == ViewBox {
j := 0
newVal := val[:0]
for i := range 4 {
if i != 0 {
if j >= len(val) || val[j] != ' ' && val[j] != ',' {
newVal = append(newVal, val[j:]...)
break
}
newVal = append(newVal, ' ')
j++
}
if dim, n := o.shortenDimension(val[j:]); n > 0 {
newVal = append(newVal, dim...)
j += n
} else {
newVal = append(newVal, val[j:]...)
break
}
}
val = newVal
} else if colorAttrMap[attr] && len(val) > 0 && (len(val) < 5 || !parse.EqualFold(val[:4], urlBytes)) {
//parse.ToLower(val)
if val[0] == '#' {
if name, ok := css.ShortenColorHex[string(val)]; ok {
val = name
} else if len(val) == 7 && val[1] == val[2] && val[3] == val[4] && val[5] == val[6] {
val[2] = val[3]
val[3] = val[5]
val = val[:4]
}
} else if hex, ok := css.ShortenColorName[css.ToHash(val)]; ok {
val = hex
// } else if len(val) > 5 && bytes.Equal(val[:4], []byte("rgb(")) && val[len(val)-1] == ')' {
// TODO: handle rgb(x, y, z) and hsl(x, y, z)
}
}
// prefer single or double quotes depending on what occurs more often in value
val = xml.EscapeAttrVal(&attrByteBuffer, val)
w.Write(val)
case xml.StartTagCloseToken:
next := tb.Peek(0)
skipExtra := false
if next.TokenType == xml.TextToken && parse.IsAllWhitespace(next.Data) {
next = tb.Peek(1)
skipExtra = true
}
if next.TokenType == xml.EndTagToken {
// collapse empty tags to single void tag
tb.Shift()
if skipExtra {
tb.Shift()
}
w.Write(voidBytes)
} else {
w.Write(t.Data)
}
if tag == ForeignObject {
printTag(w, tb, tag)
}
case xml.StartTagCloseVoidToken:
tag = 0
w.Write(t.Data)
case xml.EndTagToken:
tag = 0
if len(t.Data) > 3+len(t.Text) {
t.Data[2+len(t.Text)] = '>'
t.Data = t.Data[:3+len(t.Text)]
}
w.Write(t.Data)
}
}
}
func (o *Minifier) shortenDimension(b []byte) ([]byte, int) {
if n, m := parse.Dimension(b); n > 0 {
unit := b[n : n+m]
b = minify.Number(b[:n], o.Precision)
if len(b) != 1 || b[0] != '0' {
if m == 2 && unit[0] == 'p' && unit[1] == 'x' {
unit = nil
} else if m > 1 { // only percentage is length 1
parse.ToLower(unit)
}
b = append(b, unit...)
}
return b, n + m
}
return b, 0
}
////////////////////////////////////////////////////////////////
func printTag(w io.Writer, tb *TokenBuffer, tag Hash) {
level := 0
inStartTag := false
for {
t := *tb.Peek(0)
switch t.TokenType {
case xml.ErrorToken:
return
case xml.StartTagToken:
inStartTag = t.Hash == tag
if t.Hash == tag {
level++
}
case xml.StartTagCloseVoidToken:
if inStartTag {
if level == 0 {
return
}
level--
}
case xml.EndTagToken:
if t.Hash == tag {
if level == 0 {
return
}
level--
}
}
w.Write(t.Data)
tb.Shift()
}
}
func skipTag(tb *TokenBuffer) {
level := 0
for {
if t := *tb.Shift(); t.TokenType == xml.ErrorToken {
break
} else if t.TokenType == xml.EndTagToken || t.TokenType == xml.StartTagCloseVoidToken {
if level == 0 {
break
}
level--
} else if t.TokenType == xml.StartTagToken {
level++
}
}
}