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/*
* 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)
}
} else {
list = append(list, HTMLBasicSegmentType{Cat: 'T', Str: htmlStr, Attr: nil})
}
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.
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), underscore
// (U) and center (CENTER) 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
alignStr := "L"
for _, el := range list {
switch el.Cat {
case 'T':
if len(hrefStr) > 0 {
putLink(hrefStr, el.Str)
hrefStr = ""
} else {
html.pdf.WriteAligned(0, lineHt, el.Str, alignStr)
}
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 "center":
html.pdf.Ln(lineHt)
alignStr = "C"
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)
case "center":
html.pdf.Ln(lineHt)
alignStr = "L"
}
}
}
}
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