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
|
/*
* Copyright (c) 2014 Kurt Jung (Gmail: kurt.w.jung)
*
* 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.
*/
package gofpdf
import (
"regexp"
"strings"
)
// HTMLBasicSegmentType defines a segment of literal text in which the current
// attributes do not vary, or an open tag or a close tag.
type HTMLBasicSegmentType struct {
Cat byte // 'O' open tag, 'C' close tag, 'T' text
Str string // Literal text unchanged, tags are lower case
Attr map[string]string // Attribute keys are lower case
}
// HTMLBasicTokenize returns a list of HTML tags and literal elements. This is
// done with regular expressions, so the result is only marginally better than
// useless.
func HTMLBasicTokenize(htmlStr string) (list []HTMLBasicSegmentType) {
// This routine is adapted from http://www.fpdf.org/
list = make([]HTMLBasicSegmentType, 0, 16)
htmlStr = strings.Replace(htmlStr, "\n", " ", -1)
htmlStr = strings.Replace(htmlStr, "\r", "", -1)
tagRe, _ := regexp.Compile(`(?U)<.*>`)
attrRe, _ := regexp.Compile(`([^=]+)=["']?([^"']+)`)
capList := tagRe.FindAllStringIndex(htmlStr, -1)
if capList != nil {
var seg HTMLBasicSegmentType
var parts []string
pos := 0
for _, cap := range capList {
if pos < cap[0] {
seg.Cat = 'T'
seg.Str = htmlStr[pos:cap[0]]
seg.Attr = nil
list = append(list, seg)
}
if htmlStr[cap[0]+1] == '/' {
seg.Cat = 'C'
seg.Str = strings.ToLower(htmlStr[cap[0]+2 : cap[1]-1])
seg.Attr = nil
list = append(list, seg)
} else {
// Extract attributes
parts = strings.Split(htmlStr[cap[0]+1:cap[1]-1], " ")
if len(parts) > 0 {
for j, part := range parts {
if j == 0 {
seg.Cat = 'O'
seg.Str = strings.ToLower(parts[0])
seg.Attr = make(map[string]string)
} else {
attrList := attrRe.FindAllStringSubmatch(part, -1)
if attrList != nil {
for _, attr := range attrList {
seg.Attr[strings.ToLower(attr[1])] = attr[2]
}
}
}
}
list = append(list, seg)
}
}
pos = cap[1]
}
if len(htmlStr) > pos {
seg.Cat = 'T'
seg.Str = htmlStr[pos:]
seg.Attr = nil
list = append(list, seg)
}
}
return
}
// HTMLBasicType is used for rendering a very basic subset of HTML. It supports
// only hyperlinks and bold, italic and underscore attributes. In the Link
// structure, the ClrR, ClrG and ClrB fields (0 through 255) define the color
// of hyperlinks. The Bold, Italic and Underscore values define the hyperlink
// style.
type HTMLBasicType struct {
pdf *Fpdf
Link struct {
ClrR, ClrG, ClrB int
Bold, Italic, Underscore bool
}
}
// HTMLBasicNew returns an instance that facilitates writing basic HTML in the
// specified PDF file.
//
// This function is demonstrated in tutorial 6.
func (f *Fpdf) HTMLBasicNew() (html HTMLBasicType) {
html.pdf = f
html.Link.ClrR, html.Link.ClrG, html.Link.ClrB = 0, 0, 128
html.Link.Bold, html.Link.Italic, html.Link.Underscore = false, false, true
return
}
// Write prints text from the current position using the currently selected
// font. See HTMLBasicNew() to create a receiver that is associated with the
// PDF document instance. The text can be encoded with a basic subset of HTML
// that includes hyperlinks and tags for italic (I), bold (B) and underscore
// (U) attributes. When the right margin is reached a line break occurs and
// text continues from the left margin. Upon method exit, the current position
// is left at the end of the text.
//
// lineHt indicates the line height in the unit of measure specified in New().
func (html *HTMLBasicType) Write(lineHt float64, htmlStr string) {
var boldLvl, italicLvl, underscoreLvl, linkBold, linkItalic, linkUnderscore int
var textR, textG, textB = html.pdf.GetTextColor()
var hrefStr string
if html.Link.Bold {
linkBold = 1
}
if html.Link.Italic {
linkItalic = 1
}
if html.Link.Underscore {
linkUnderscore = 1
}
setStyle := func(boldAdj, italicAdj, underscoreAdj int) {
styleStr := ""
boldLvl += boldAdj
if boldLvl > 0 {
styleStr += "B"
}
italicLvl += italicAdj
if italicLvl > 0 {
styleStr += "I"
}
underscoreLvl += underscoreAdj
if underscoreLvl > 0 {
styleStr += "U"
}
html.pdf.SetFont("", styleStr, 0)
}
putLink := func(urlStr, txtStr string) {
// Put a hyperlink
html.pdf.SetTextColor(html.Link.ClrR, html.Link.ClrG, html.Link.ClrB)
setStyle(linkBold, linkItalic, linkUnderscore)
html.pdf.WriteLinkString(lineHt, txtStr, urlStr)
setStyle(-linkBold, -linkItalic, -linkUnderscore)
html.pdf.SetTextColor(textR, textG, textB)
}
list := HTMLBasicTokenize(htmlStr)
var ok bool
for _, el := range list {
switch el.Cat {
case 'T':
if len(hrefStr) > 0 {
putLink(hrefStr, el.Str)
hrefStr = ""
} else {
html.pdf.Write(lineHt, el.Str)
}
case 'O':
switch el.Str {
case "b":
setStyle(1, 0, 0)
case "i":
setStyle(0, 1, 0)
case "u":
setStyle(0, 0, 1)
case "br":
html.pdf.Ln(lineHt)
case "a":
hrefStr, ok = el.Attr["href"]
if !ok {
hrefStr = ""
}
}
case 'C':
switch el.Str {
case "b":
setStyle(-1, 0, 0)
case "i":
setStyle(0, -1, 0)
case "u":
setStyle(0, 0, -1)
}
}
}
}
|
