//
// Blackfriday Markdown Processor
// Available at http://github.com/russross/blackfriday
//
// Copyright © 2011 Russ Ross <russ@russross.com>.
// Distributed under the Simplified BSD License.
// See README.md for details.
//
//
// Functions to parse inline elements.
//
package blackfriday
import (
"bytes"
"regexp"
"strconv"
)
var (
urlRe = `((https?|ftp):\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+`
anchorRe = regexp.MustCompile(`^(<a\shref="` + urlRe + `"(\stitle="[^"<>]+")?\s?>` + urlRe + `<\/a>)`)
// TODO: improve this regexp to catch all possible entities:
htmlEntityRe = regexp.MustCompile(`&[a-z]{2,5};`)
)
// Functions to parse text within a block
// Each function returns the number of chars taken care of
// data is the complete block being rendered
// offset is the number of valid chars before the current cursor
func (p *Markdown) inline(currBlock *Node, data []byte) {
// handlers might call us recursively: enforce a maximum depth
if p.nesting >= p.maxNesting || len(data) == 0 {
return
}
p.nesting++
beg, end := 0, 0
for end < len(data) {
handler := p.inlineCallback[data[end]]
if handler != nil {
if consumed, node := handler(p, data, end); consumed == 0 {
// No action from the callback.
end++
} else {
// Copy inactive chars into the output.
currBlock.AppendChild(text(data[beg:end]))
if node != nil {
currBlock.AppendChild(node)
}
// Skip past whatever the callback used.
beg = end + consumed
end = beg
}
} else {
end++
}
}
if beg < len(data) {
if data[end-1] == '\n' {
end--
}
currBlock.AppendChild(text(data[beg:end]))
}
p.nesting--
}
// single and double emphasis parsing
func emphasis(p *Markdown, data []byte, offset int) (int, *Node) {
data = data[offset:]
c := data[0]
if len(data) > 2 && data[1] != c {
// whitespace cannot follow an opening emphasis;
// strikethrough only takes two characters '~~'
if c == '~' || isspace(data[1]) {
return 0, nil
}
ret, node := helperEmphasis(p, data[1:], c)
if ret == 0 {
return 0, nil
}
return ret + 1, node
}
if 