File: template_impl.go

package info (click to toggle)
golang-github-jung-kurt-gofpdf 2.17.2%2Bds-3
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bullseye, sid
  • size: 2,368 kB
  • sloc: makefile: 51; awk: 7
file content (303 lines) | stat: -rw-r--r-- 8,035 bytes parent folder | download
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
package gofpdf

import (
	"bytes"
	"crypto/sha1"
	"encoding/gob"
	"errors"
	"fmt"
)

/*
 * Copyright (c) 2015 Kurt Jung (Gmail: kurt.w.jung),
 *   Marcus Downing, Jan Slabon (Setasign)
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

// newTpl creates a template, copying graphics settings from a template if one is given
func newTpl(corner PointType, size SizeType, orientationStr, unitStr, fontDirStr string, fn func(*Tpl), copyFrom *Fpdf) Template {
	sizeStr := ""

	fpdf := fpdfNew(orientationStr, unitStr, sizeStr, fontDirStr, size)
	tpl := Tpl{*fpdf}
	if copyFrom != nil {
		tpl.loadParamsFromFpdf(copyFrom)
	}
	tpl.Fpdf.AddPage()
	fn(&tpl)

	bytes := make([][]byte, len(tpl.Fpdf.pages))
	// skip the first page as it will always be empty
	for x := 1; x < len(bytes); x++ {
		bytes[x] = tpl.Fpdf.pages[x].Bytes()
	}

	templates := make([]Template, 0, len(tpl.Fpdf.templates))
	for _, key := range templateKeyList(tpl.Fpdf.templates, true) {
		templates = append(templates, tpl.Fpdf.templates[key])
	}
	images := tpl.Fpdf.images

	template := FpdfTpl{corner, size, bytes, images, templates, tpl.Fpdf.page}
	return &template
}

// FpdfTpl is a concrete implementation of the Template interface.
type FpdfTpl struct {
	corner    PointType
	size      SizeType
	bytes     [][]byte
	images    map[string]*ImageInfoType
	templates []Template
	page      int
}

// ID returns the global template identifier
func (t *FpdfTpl) ID() string {
	return fmt.Sprintf("%x", sha1.Sum(t.Bytes()))
}

// Size gives the bounding dimensions of this template
func (t *FpdfTpl) Size() (corner PointType, size SizeType) {
	return t.corner, t.size
}

// Bytes returns the actual template data, not including resources
func (t *FpdfTpl) Bytes() []byte {
	return t.bytes[t.page]
}

// FromPage creates a new template from a specific Page
func (t *FpdfTpl) FromPage(page int) (Template, error) {
	// pages start at 1
	if page == 0 {
		return nil, errors.New("Pages start at 1 No template will have a page 0")
	}

	if page > t.NumPages() {
		return nil, fmt.Errorf("The template does not have a page %d", page)
	}
	// if it is already pointing to the correct page
	// there is no need to create a new template
	if t.page == page {
		return t, nil
	}

	t2 := *t
	t2.page = page
	return &t2, nil
}

// FromPages creates a template slice with all the pages within a template.
func (t *FpdfTpl) FromPages() []Template {
	p := make([]Template, t.NumPages())
	for x := 1; x <= t.NumPages(); x++ {
		// the only error is when accessing a
		// non existing template... that can't happen
		// here
		p[x-1], _ = t.FromPage(x)
	}

	return p
}

// Images returns a list of the images used in this template
func (t *FpdfTpl) Images() map[string]*ImageInfoType {
	return t.images
}

// Templates returns a list of templates used in this template
func (t *FpdfTpl) Templates() []Template {
	return t.templates
}

// NumPages returns the number of available pages within the template. Look at FromPage and FromPages on access to that content.
func (t *FpdfTpl) NumPages() int {
	// the first page is empty to
	// make the pages begin at one
	return len(t.bytes) - 1
}

// Serialize turns a template into a byte string for later deserialization
func (t *FpdfTpl) Serialize() ([]byte, error) {
	b := new(bytes.Buffer)
	enc := gob.NewEncoder(b)
	err := enc.Encode(t)

	return b.Bytes(), err
}

// DeserializeTemplate creaties a template from a previously serialized
// template
func DeserializeTemplate(b []byte) (Template, error) {
	tpl := new(FpdfTpl)
	dec := gob.NewDecoder(bytes.NewBuffer(b))
	err := dec.Decode(tpl)
	return tpl, err
}

// childrenImages returns the next layer of children images, it doesn't dig into
// children of children. Applies template namespace to keys to ensure
// no collisions. See UseTemplateScaled
func (t *FpdfTpl) childrenImages() map[string]*ImageInfoType {
	childrenImgs := make(map[string]*ImageInfoType)

	for x := 0; x < len(t.templates); x++ {
		imgs := t.templates[x].Images()
		for key, val := range imgs {
			name := sprintf("t%s-%s", t.templates[x].ID(), key)
			childrenImgs[name] = val
		}
	}

	return childrenImgs
}

// childrensTemplates returns the next layer of children templates, it doesn't dig into
// children of children.
func (t *FpdfTpl) childrensTemplates() []Template {
	childrenTmpls := make([]Template, 0)

	for x := 0; x < len(t.templates); x++ {
		tmpls := t.templates[x].Templates()
		childrenTmpls = append(childrenTmpls, tmpls...)
	}

	return childrenTmpls
}

// GobEncode encodes the receiving template into a byte buffer. Use GobDecode
// to decode the byte buffer back to a template.
func (t *FpdfTpl) GobEncode() ([]byte, error) {
	w := new(bytes.Buffer)
	encoder := gob.NewEncoder(w)

	childrensTemplates := t.childrensTemplates()
	firstClassTemplates := make([]Template, 0)

found_continue:
	for x := 0; x < len(t.templates); x++ {
		for y := 0; y < len(childrensTemplates); y++ {
			if childrensTemplates[y].ID() == t.templates[x].ID() {
				continue found_continue
			}
		}

		firstClassTemplates = append(firstClassTemplates, t.templates[x])
	}
	err := encoder.Encode(firstClassTemplates)

	childrenImgs := t.childrenImages()
	firstClassImgs := make(map[string]*ImageInfoType)

	for key, img := range t.images {
		if _, ok := childrenImgs[key]; !ok {
			firstClassImgs[key] = img
		}
	}

	if err == nil {
		err = encoder.Encode(firstClassImgs)
	}
	if err == nil {
		err = encoder.Encode(t.corner)
	}
	if err == nil {
		err = encoder.Encode(t.size)
	}
	if err == nil {
		err = encoder.Encode(t.bytes)
	}
	if err == nil {
		err = encoder.Encode(t.page)
	}

	return w.Bytes(), err
}

// GobDecode decodes the specified byte buffer into the receiving template.
func (t *FpdfTpl) GobDecode(buf []byte) error {
	r := bytes.NewBuffer(buf)
	decoder := gob.NewDecoder(r)

	firstClassTemplates := make([]*FpdfTpl, 0)
	err := decoder.Decode(&firstClassTemplates)
	t.templates = make([]Template, len(firstClassTemplates))

	for x := 0; x < len(t.templates); x++ {
		t.templates[x] = Template(firstClassTemplates[x])
	}

	firstClassImages := t.childrenImages()

	t.templates = append(t.childrensTemplates(), t.templates...)

	t.images = make(map[string]*ImageInfoType)
	if err == nil {
		err = decoder.Decode(&t.images)
	}

	for k, v := range firstClassImages {
		t.images[k] = v
	}

	if err == nil {
		err = decoder.Decode(&t.corner)
	}
	if err == nil {
		err = decoder.Decode(&t.size)
	}
	if err == nil {
		err = decoder.Decode(&t.bytes)
	}
	if err == nil {
		err = decoder.Decode(&t.page)
	}

	return err
}

// Tpl is an Fpdf used for writing a template. It has most of the facilities of
// an Fpdf, but cannot add more pages. Tpl is used directly only during the
// limited time a template is writable.
type Tpl struct {
	Fpdf
}

func (t *Tpl) loadParamsFromFpdf(f *Fpdf) {
	t.Fpdf.compress = false

	t.Fpdf.k = f.k
	t.Fpdf.x = f.x
	t.Fpdf.y = f.y
	t.Fpdf.lineWidth = f.lineWidth
	t.Fpdf.capStyle = f.capStyle
	t.Fpdf.joinStyle = f.joinStyle

	t.Fpdf.color.draw = f.color.draw
	t.Fpdf.color.fill = f.color.fill
	t.Fpdf.color.text = f.color.text

	t.Fpdf.fonts = f.fonts
	t.Fpdf.currentFont = f.currentFont
	t.Fpdf.fontFamily = f.fontFamily
	t.Fpdf.fontSize = f.fontSize
	t.Fpdf.fontSizePt = f.fontSizePt
	t.Fpdf.fontStyle = f.fontStyle
	t.Fpdf.ws = f.ws

	for key, value := range f.images {
		t.Fpdf.images[key] = value
	}
}