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# Status:
# [.] Inline HTML
# [x] Autoescape
# [ ] Block elements
# [x] Paragraph
# [x] Line break
# [.] Headers (atx and setex)
# [x] Blockquotes
# [ ] Lists
# [ ] Code blocks
# [x] Horizontal rules
# [ ] Span elements
# [ ] Links
# [x] Emphasis
# [ ] Code
# [ ] Images
# [ ] Other
# [ ] Autolinks
# [ ] Escapes
#
# [ ] Non-standard features
# [ ] Strikethrough ~~...~~
# [ ] Superscript ^^...^^
# [ ] Subscript ~...~
# [ ] Footnote [^...] (with user customizations)
# [ ] Task list - [ ]
# [ ] Definition lists
# [ ] Fenced code blocks ```lang ```
# [ ] Table alignment
BEGIN {
prev_blankline = blankline = 1
newStack("bq-level")
}
{
prev_blankline = blankline
blankline = 1
}
/[^[:blank:]]/ {
blankline = 0
}
# Blockquote Part 1/2
/^>[[:blank:]]*$/ { next }
/^> / {
level = 0
while (match($0, /^> [[:blank:]]*/)) {
$0 = substr($0, RLENGTH + 1)
level += RSTART
while (topStack("bq-level") > level) {
print "</blockquote>"
popStack("bq-level")
}
if (topStack("bq-level") < level) {
print "<blockquote>"
pushStack("bq-level", level)
}
}
}
# Inline HTML
/^[[:blank:]]*<\/?[[:alnum:]]+/ {
print
next
}
# Horizontal rules
/^(-|\*|_) ?(-|\*|_) ?(-|\*|_|[[:blank:]])+$/ {
print "<hr>"
blankline = 1
next
}
# Line break
/ $/ {
sub(/ $/, "</br>")
}
# atx-style headers
/^[[:blank:]]*#+/ {
match($0, /#+/)
if (RLENGTH <= 6) {
gsub(/^[[:blank:]]*#+[[:blank:]]*/, "")
gsub(/[[:blank:]]*#+[[:blank:]]*$/, "")
print "<h" RLENGTH ">" $0 "</h" RLENGTH ">"
blankline = 1
next
}
}
# setex-style headers TODO
# Code blocks
/^( |\t)[[:blank:]]*/ {
}
# Paragraphs
prev_blankline && !blankline && lengthStack("bq-level") == 0 { print "<p>" }
!prev_blankline && blankline && lengthStack("bq-level") == 0 { print "</p>" }
# Blockquote Part 2/2
blankline {
while (lengthStack("bq-level") > 0) {
print "</blockquote>"
popStack("bq-level")
}
}
# Auto-escape &
/&/ {
ampstart = 0
while (match(substr($0, ampstart + 1), /&/)) {
ampstart += RSTART
if (match(substr($0, ampstart), /&[[:alnum:]#]+;/)) { continue }
$0 = substr($0, 1, ampstart - 1) "&" substr($0, ampstart + 1)
}
}
# Auto-escape <
/</ {
gsub(/</, "\\<")
}
# Emphasis
/__.+__/ {
while (match($0, /__/)) {
sub(/__/, "<strong>")
sub(/__/, "</strong>")
}
}
/\*\*.+\*\*/ {
while (match($0, /\*\*/)) {
sub(/\*\*/, "<strong>")
sub(/\*\*/, "</strong>")
}
}
/_[^_].+_/ {
while (match($0, /_/)) {
sub(/_/, "<em>")
sub(/_/, "</em>")
}
}
/\*[^_].+\*/ {
while (match($0, /\*/)) {
sub(/\*/, "<em>")
sub(/\*/, "</em>")
}
}
{ print }
END {
if (!blankline && lengthStack("bq-level") == 0) { print "</p>" }
while (lengthStack("bq-level") > 0) {
print "</blockquote>"
popStack("bq-level")
}
}
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