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d.awk
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#! /usr/bin/awk -f
##
# d.awk
# =====
#
# Converts Markdown in C/C++-style code comments to HTML. \
# <https://github.com/wernsey/d.awk>
#
# The comments must have the `/** */` pattern. Every line in the comment
# must start with a *. Like so:
#
# ```c
# /**
# * Markdown here...
# */
# ```
#
# Alternatively, three slashes can also be used: `/// Markdown here`
#
# ## Configuration Options
#
# You can set these in the BEGIN block below, or pass them to the script through the
# `-v` command-line option:
#
# - `-vTitle="My Document Title"` to set the `<title/>` in the `<head/>` section of the HTML
# - `-vStyleSheet=style.css` to use a separate CSS file as style sheet.
# - `-vCss=n` with n either 0 to disable CSS or 1 to enable; Default = 1
# - `-vTopLinks=1` to have links to the top of the doc next to headers.
# - `-vMaxWidth=1080px` specifies the Maximum width of the HTML output.
# - `-vPretty=0` disable syntax highlighting with Google's [code prettify][].
# - `-vMermaid=0` disable [Mermaid][] diagrams.
# - `-vMathjax=0` disable [MathJax][] mathematical rendering.
# - `-vHideToCLevel=n` specifies the level of the ToC that should be collapsed by default.
# - `-vLang=n` specifies the value of the `lang` attribute of the <html> tag; Default = "en"
# - `-vTables=0` disables support for [GitHub-style tables][github-tables]
# - `-vclassic_underscore=1` words_with_underscores behave like old markdown where the
# underscores in the word counts as emphasis. The default behaviour is to have
# `words_like_this` not contain any emphasis.
# - `-vNumberHeadings=1` to enable or disable section numbers in front of headings; Default = 1
# - `-vNumberH1s=1`: if `NumberHeadings` is enabled, `<H1>` headings are not numbered by
# default (because the `<H1>` would typically contain the document title). Use this to
# number `<H1>`s as well.
# - `-vClean=1` to treat the input file as a plain Markdown file.
# You could use `./d.awk -vClean=1 README.md > README.html` to generate HTML from
# your README, for example.
#
# I've tested it with Gawk, Nawk and Mawk.
# Gawk and Nawk worked without issues, but don't use the `-W compat`
# or `-W traditional` settings with Gawk.
# Mawk v1.3.4 worked correctly but v1.3.3 choked on it.
#
# [code prettify]: https://github.com/google/code-prettify
# [Mermaid]: https://github.com/mermaid-js/mermaid
# [MathJax]: https://www.mathjax.org/
# [github-tables]: https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#tables
# [github-mermaid]: https://github.blog/2022-02-14-include-diagrams-markdown-files-mermaid/
# [github-math]: https://github.blog/changelog/2022-05-19-render-mathematical-expressions-in-markdown/
#
# ## Extensions
#
# - Insert a Table of Contents by using `\![toc]`.
# The Table of Contents is collapsed by default:
# - Use `\\![toc+]` to insert a ToC that is expanded by default;
# - Use `\\![toc-]` for a collapsed ToC.
# - Github-style ```` ``` ```` code blocks supported.
# - Github-style `~~strikethrough~~` supported.
# - [Github-style tables][github-tables] are supported.
# - [GitHub-style Mermaid diagrams][github-mermaid]
# - [GitHub-style mathematical expressions][github-math]: $\sqrt{3x-1}+(1+x)^2$
# - GitHub-style task lists `- [x]` are supported for documenting bugs and todo lists in code.
# - The `id` attribute of anchor tags `<a>` are treated as in GitHub:
# The tag's id should be the title, in lower case stripped of non-alphanumeric characters
# (except hyphens and spaces) and then with all spaces replaced with hyphens.
# then add -1, -2, -3 until it's unique
# See [here](https://gist.github.com/asabaylus/3071099) (especially the comment by TomOnTime)
# and [here](https://gist.github.com/rachelhyman/b1f109155c9dafffe618)
# - A couple of ideas from MultiMarkdown:
# - `\\[^footnotes]` are supported.
# - `*[abbr]:` Abbreviations are supported.
# - Space followed by \\ at the end of a line also forces a line break.
# - Default behaviour is to have words_like_this not contain emphasis.
#
# Limitations:
#
# - You can't nest `<blockquote>`s, and they can't contain nested lists
# or `pre` blocks. You can work around this by using HTML directly.
# - It takes some liberties with how inline (particularly block-level) HTML is processed and not
# all HTML tags supported. HTML forms and `<script/>` tags are out.
# - Paragraphs in lists differ a bit from other markdowns. Use indented blank lines to get
# to insert `<br>` tags to emulate paragraphs. Blank lines stop the list by inserting the
# `</ul>` or `</ol>` tags.
#
# ## References
#
# - <https://tools.ietf.org/html/rfc7764>
# - <http://daringfireball.net/projects/markdown/syntax>
# - <https://guides.github.com/features/mastering-markdown/>
# - <http://fletcher.github.io/MultiMarkdown-4/syntax>
# - <http://spec.commonmark.org>
#
# ## License
#
# (c) 2016-2023 Werner Stoop
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without any warranty.
#
BEGIN {
# Configuration options
if(Title== "") Title = "Documentation";
if(Css== "") Css = 1;
if(Pretty== "") Pretty = 1;
if(Mermaid== "") Mermaid = 1;
if(Mathjax=="") Mathjax = 1;
if(HideToCLevel== "") HideToCLevel = 3;
if(Lang == "") Lang = "en";
if(Tables == "") Tables = 1;
#TopLinks = 1;
#classic_underscore = 1;
if(MaxWidth=="") MaxWidth="1080px";
if(NumberHeadings=="") NumberHeadings = 1;
if(NumberH1s=="") NumberH1s = 0;
Mode = (Clean)?"p":"none";
ToC = ""; ToCLevel = 1;
CSS = init_css(Css);
for(i = 0; i < 128; i++)
_ord[sprintf("%c", i)] = i;
srand();
}
!Clean && !Multi && /\/\*\*/ {
Mode = "p";
sub(/^.*\/\*\*/,"");
if(match($0,/\*\//)) {
sub(/\*\/.*/,"");
Out = Out filter($0);
Out = Out tag(Mode, scrub(Buf));
Buf = "";
Prev = "";
} else {
Out = Out filter($0);
Multi = 1;
}
}
Multi && /\*\// {
gsub(/\*\/.*$/,"");
if(match($0, /^[[:space:]]*\*/))
Out = Out filter(substr($0, RSTART+RLENGTH));
if(Mode == "ul" || Mode == "ol") {
while(ListLevel > 1)
Buf = Buf "\n</" Open[ListLevel--] ">";
Out = Out tag(Mode, Buf "\n");
} else if(Mode == "table") {
Out = Out end_table();
} else {
Buf = trim(scrub(Buf));
if(Buf)
Out = Out tag(Mode, Buf);
}
Mode = "none";
Multi = 0;
Buf = "";
Prev = "";
}
Multi {
gsub(/\r/, "", $0);
if(match($0,/[[:graph:]]/) && substr($0,RSTART,1)!="*")
next;
gsub(/^[[:space:]]*\*/, "", $0);
}
Multi { Out = Out filter($0); }
# These are the rules for `///` single-line comments:
Single && $0 !~ /\/\/\// {
if(Mode == "ul" || Mode == "ol") {
while(ListLevel > 1)
Buf = Buf "\n</" Open[ListLevel--] ">";
Out = Out tag(Mode, Buf "\n");
} else {
Buf = trim(scrub(Buf));
if(Buf)
Out = Out tag(Mode, Buf);
}
Mode = "none";
Single = 0;
Buf = "";
Prev = "";
}
Single && /\/\/\// {
sub(/.*\/\/\//,"");
Out = Out filter($0);
}
!Clean && !Single && !Multi && /\/\/\// {
sub(/.*\/\/\//,"");
Single = 1;
Mode = "p";
Out = Out filter($0);
}
Clean {
Out = Out filter($0);
}
END {
if(Mode == "ul" || Mode == "ol") {
while(ListLevel > 1)
Buf = Buf "\n</" Open[ListLevel--] ">";
Out = Out tag(Mode, Buf "\n");
} else if(Mode == "pre") {
while(ListLevel > 1)
Buf = Buf "\n</" Open[ListLevel--] ">";
Out = Out tag(Mode, Buf "\n");
} else if(Mode == "table") {
Out = Out end_table();
} else {
Buf = trim(scrub(Buf));
if(Buf)
Out = Out tag(Mode, Buf);
}
print "<!DOCTYPE html>\n<html lang=\"" Lang "\"><head>"
print "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">";
print "<title>" Title "</title>";
if(StyleSheet)
print "<link rel=\"stylesheet\" href=\"" StyleSheet "\">";
else {
if(Pretty && HasPretty) {
CSS = CSS "\nbody {--str:#a636d8;--kwd:#4646ff;--com:#56a656;--lit:#e05e10;--typ:#0222ce;--pun:#595959;}\n"\
"body.dark-theme {--str:#eb28df;--kwd:#f7d689;--com:#267b26;--lit: #ff8181;--typ:#228dff;--pun: #EEE;}\n"\
"@media (prefers-color-scheme: dark) {\n"\
" body.light-theme {--str:#a636d8;--kwd:#4646ff;--com:#56a656;--lit:#e05e10;--typ:#0222ce;--pun:#595959;}\n"\
" body {--str:#eb28df;--kwd:#f7d689;--com:#267b26;--lit: #ff8181;--typ:#228dff;--pun: #EEE;}\n"\
"}\n"\
".com { color:var(--com); } /* comment */\n"\
".kwd, .tag { color:var(--kwd); } /* keyword, markup tag */\n"\
".typ, .atn { color:var(--typ); } /* type name, html/xml attribute name */\n"\
".str, .atv { color:var(--str); } /* string literal, html/xml attribute value */\n"\
".lit, .dec, .var { color:var(--lit); } /* literal */\n"\
".pun, .opn, .clo { color:var(--pun); } /* punctuation */\n"\
".pln { color:var(--alt-color); } /* plain text */\n"\
"@media print, projection {\n"\
" .com { font-style: italic }\n"\
" .kwd, .typ, .tag { font-weight: bold }\n"\
"}";
}
print "<style><!--" CSS "\n" \
".print-only {display:none}\n"\
"@media print { .no-print { display: none !important; } .print-only {display:block} }\n" \
"--></style>";
}
if(ToC && match(Out, /!\[toc[-+]?\]/))
print "<script><!--\n" \
"function toggle_toc(n) {\n" \
" var toc=document.getElementById('table-of-contents-' + n);\n" \
" var btn=document.getElementById('btn-text-' + n);\n" \
" toc.style.display=(toc.style.display=='none')?'block':'none';\n" \
" btn.innerHTML=(toc.style.display=='none')?'►':'▼';\n" \
"}\n" \
"function toggle_toc_ul(n) { \n" \
" var toc=document.getElementById('toc-ul-' + n); \n" \
" var btn=document.getElementById('toc-btn-' + n); \n" \
" if(toc) {\n" \
" toc.style.display=(toc.style.display=='none')?'block':'none'; \n" \
" btn.innerHTML=(toc.style.display=='none')?'►':'▼';\n" \
" }\n" \
"}\n" \
"//-->\n</script>";
print "</head><body onload=\"PR.prettyPrint()\">";
print "<a class=\"dark-toggle no-print\">\n" \
"<svg width=\"12\" height=\"12\" viewBox=\"0 0 12 20\" xmlns=\"http://www.w3.org/2000/svg\">\n" \
"<g transform=\"translate(8 12) scale(8 8)\">\n" \
"<path fill=\"var(--color)\" d=\"M 0.25 -1 C -0.5 -1 -1 -0.5 -1 0 C -1.02 0.5 -0.5 1 0.25 1 C 0 1 -0.5 0.5 -0.5 0 C -0.5 -0.5 0 -1 0.25 -1\"/>\n" \
"</g>\n" \
"</svg>\n Toggle Dark Mode</a>\n";
print "<script>\n"\
"const prefersDarkScheme = window.matchMedia('(prefers-color-scheme: dark)');\n"\
"document.querySelector('.dark-toggle').addEventListener('click', function () {\n"\
" document.body.classList.toggle(prefersDarkScheme.matches ? 'light-theme' : 'dark-theme');\n"\
"});\n"\
"</script>";
if(Out) {
Out = fix_footnotes(Out);
Out = fix_links(Out);
Out = fix_abbrs(Out);
Out = make_toc(Out);
print trim(Out);
if(footnotes) {
footnotes = fix_links(footnotes);
print "<hr><ol class=\"footnotes\">\n" footnotes "</ol>";
}
}
if(Pretty && HasPretty) {
print "<script src=\"https://cdn.jsdelivr.net/gh/google/code-prettify@master/loader/prettify.js\"></script>";
}
if(Mermaid && HasMermaid) {
print "<script src=\"https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js\"></script>";
print "<script>mermaid.initialize({ startOnLoad: true, theme:window.matchMedia('(prefers-color-scheme: dark)').matches?'dark':'default' });</script>";
}
if(Mathjax && HasMathjax) {
print "<script>MathJax={tex:{inlineMath:[['$','$'],['\\\\(','\\\\)']]},svg:{fontCache:'global'}};</script>";
print "<script src=\"https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js\" type=\"text/javascript\" id=\"MathJax-script\" async></script>";
}
print "</body></html>"
}
function escape(st) {
gsub(/&/, "\\&", st);
gsub(/</, "\\<", st);
gsub(/>/, "\\>", st);
return st;
}
function strip_tags(st) {
gsub(/<\/?[^>]+>/,"",st);
return st;
}
function trim(st) {
sub(/^[[:space:]]+/, "", st);
sub(/[[:space:]]+$/, "", st);
return st;
}
function filter(st, res,tmp, linkdesc, url, delim, edelim, name, def, plang, mmaid, cols, i) {
if(Mode == "p") {
if(match(st, /^[[:space:]]*\[[-._[:alnum:][:space:]]+\]:/)) {
linkdesc = ""; LastLink = 0;
match(st,/\[.*\]/);
LinkRef = tolower(substr(st, RSTART+1, RLENGTH-2));
st = substr(st, RSTART+RLENGTH+2);
match(st, /[^[:space:]]+/);
url = substr(st, RSTART, RLENGTH);
st = substr(st, RSTART+RLENGTH+1);
if(match(url, /^<.*>/))
url = substr(url, RSTART+1, RLENGTH-2);
if(match(st, /["'(]/)) {
delim = substr(st, RSTART, 1);
edelim = (delim == "(") ? ")" : delim;
if(match(st, delim ".*" edelim))
linkdesc = substr(st, RSTART+1, RLENGTH-2);
}
LinkUrls[LinkRef] = escape(url);
if(!linkdesc) LastLink = 1;
LinkDescs[LinkRef] = escape(linkdesc);
return;
} else if(LastLink && match(st, /^[[:space:]]*["'(]/)) {
match(st, /["'(]/);
delim = substr(st, RSTART, 1);
edelim = (delim == "(") ? ")" : delim;
st = substr(st, RSTART);
if(match(st, delim ".*" edelim))
LinkDescs[LinkRef] = escape(substr(st,RSTART+1,RLENGTH-2));
LastLink = 0;
return;
} else if(match(st, /^[[:space:]]*\[\^[-._[:alnum:][:space:]]+\]:[[:space:]]*/)) {
match(st, /\[\^[[:alnum:]]+\]:/);
name = substr(st, RSTART+2,RLENGTH-4);
def = substr(st, RSTART+RLENGTH+1);
Footnote[tolower(name)] = scrub(def);
return;
} else if(match(st, /^[[:space:]]*\*\[[[:alnum:]]+\]:[[:space:]]*/)) {
match(st, /\[[[:alnum:]]+\]/);
name = substr(st, RSTART+1,RLENGTH-2);
def = substr(st, RSTART+RLENGTH+2);
Abbrs[toupper(name)] = def;
return;
} else if(match(st, /^(( )| *\t)/) || match(st, /^[[:space:]]*```+[[:alnum:]]*/)) {
Preterm = trim(substr(st, RSTART,RLENGTH));
st = substr(st, RSTART+RLENGTH);
if(Buf) res = tag("p", scrub(Buf));
Buf = st;
push("pre");
} else if(!trim(Prev) && match(st, /^[[:space:]]*[*-][[:space:]]*[*-][[:space:]]*[*-][-*[:space:]]*$/)) {
if(Buf) res = tag("p", scrub(Buf));
Buf = "";
res = res "<hr>\n";
} else if(match(st, /^[[:space:]]*===+[[:space:]]*$/)) {
Buf = trim(substr(Buf, 1, length(Buf) - length(Prev) - 1));
if(Buf) res= tag("p", scrub(Buf));
if(Prev) res = res heading(1, scrub(Prev));
Buf = "";
} else if(match(st, /^[[:space:]]*---+[[:space:]]*$/)) {
Buf = trim(substr(Buf, 1, length(Buf) - length(Prev) - 1));
if(Buf) res = tag("p", scrub(Buf));
if(Prev) res = res heading(2, scrub(Prev));
Buf = "";
} else if(match(st, /^[[:space:]]*#+/)) {
sub(/#+[[:space:]]*$/, "", st);
match(st, /#+/);
ListLevel = RLENGTH;
tmp = substr(st, RSTART+RLENGTH);
if(Buf) res = tag("p", scrub(Buf));
res = res heading(ListLevel, scrub(trim(tmp)));
Buf = "";
} else if(match(st, /^[[:space:]]*>/)) {
if(Buf) res = tag("p", scrub(Buf));
Buf = scrub(trim(substr(st, RSTART+RLENGTH)));
push("blockquote");
} else if(Tables && match(st, /.*\|(.*\|)+/)) {
if(Buf) res = tag("p", scrub(Buf));
Row = 1;
for(i = 1; i <= MaxCols; i++)
Align[i] = "";
process_table_row(st);
push("table");
} else if(match(st, /^[[:space:]]*([*+-]|[[:digit:]]+\.)[[:space:]]/)) {
if(Buf) res = tag("p", scrub(Buf));
Buf="";
match(st, /^[[:space:]]*/);
ListLevel = 1;
indent[ListLevel] = RLENGTH;
Open[ListLevel]=match(st, /^[[:space:]]*[*+-][[:space:]]*/)?"ul":"ol";
push(Open[ListLevel]);
res = res filter(st);
} else if(match(st, /^[[:space:]]*$/)) {
if(trim(Buf)) {
res = tag("p", scrub(trim(Buf)));
Buf = "";
}
} else
Buf = Buf st "\n";
LastLink = 0;
} else if(Mode == "blockquote") {
if(match(st, /^[[:space:]]*>[[:space:]]*$/))
Buf = Buf "\n</p><p>";
else if(match(st, /^[[:space:]]*>/))
Buf = Buf "\n" scrub(trim(substr(st, RSTART+RLENGTH)));
else if(match(st, /^[[:space:]]*$/)) {
res = tag("blockquote", tag("p", trim(Buf)));
pop();
res = res filter(st);
} else
Buf = Buf st;
} else if(Mode == "table") {
if(match(st, /.*\|(.*\|)+/)) {
process_table_row(st);
} else {
res = end_table();
pop();
res = res filter(st);
}
} else if(Mode == "pre") {
if(!Preterm && match(st, /^(( )| *\t)/) || Preterm && !match(st, /^[[:space:]]*```+/))
Buf = Buf ((Buf)?"\n":"") substr(st, RSTART+RLENGTH);
else {
gsub(/\t/," ",Buf);
if(length(trim(Buf)) > 0) {
plang = ""; mmaid=0;
if(match(Preterm, /^[[:space:]]*```+/)) {
plang = trim(substr(Preterm, RSTART+RLENGTH));
if(plang) {
if(plang == "mermaid") {
mmaid = 1;
HasMermaid = 1;
} else {
HasPretty = 1;
if(plang == "auto")
plang = "class=\"prettyprint\"";
else
plang = "class=\"prettyprint lang-" plang "\"";
}
}
}
if(mmaid && Mermaid)
res = tag("div", Buf, "class=\"mermaid\"");
else
res = tag("pre", tag("code", escape(Buf), plang));
}
pop();
if(Preterm) sub(/^[[:space:]]*```+[[:alnum:]]*/,"",st);
res = res filter(st);
}
} else if(Mode == "ul" || Mode == "ol") {
if(ListLevel == 0 || match(st, /^[[:space:]]*$/) && (RLENGTH <= indent[1])) {
while(ListLevel > 1)
Buf = Buf "\n</" Open[ListLevel--] ">";
res = tag(Mode, "\n" Buf "\n");
pop();
} else {
if(match(st, /^[[:space:]]*([*+-]|[[:digit:]]+\.)/)) {
tmp = substr(st, RLENGTH+1);
match(st, /^[[:space:]]*/);
if(RLENGTH > indent[ListLevel]) {
indent[++ListLevel] = RLENGTH;
if(match(st, /^[[:space:]]*[*+-]/))
Open[ListLevel] = "ul";
else
Open[ListLevel] = "ol";
Buf = Buf "\n<" Open[ListLevel] ">";
} else while(RLENGTH < indent[ListLevel])
Buf = Buf "\n</" Open[ListLevel--] ">";
if(match(tmp,/^[[:space:]]*\[[xX[:space:]]\]/)) {
st = substr(tmp,RLENGTH+1);
tmp = tolower(substr(tmp,RSTART,RLENGTH));
Buf = Buf "<li><input type=\"checkbox\" " (index(tmp,"x")?"checked":"") " disabled>" scrub(st);
} else
Buf = Buf "<li>" scrub(tmp);
} else if(match(st, /^[[:space:]]*$/)){
Buf = Buf "<br>\n";
} else {
sub(/^[[:space:]]+/,"",st);
Buf = Buf "\n" scrub(st);
}
}
}
Prev = st;
return res;
}
function scrub(st, mp, ms, me, r, p, tg, a, tok) {
sub(/ $/,"<br>\n",st);
gsub(/( |[[:space:]]+\\)\n/,"<br>\n",st);
gsub(/( |[[:space:]]+\\)$/,"<br>\n",st);
while(match(st, /(__?|\*\*?|~~|`+|\$+|\\\(|[&><\\])/)) {
a = substr(st, 1, RSTART-1);
mp = substr(st, RSTART, RLENGTH);
ms = substr(st, RSTART-1,1);
me = substr(st, RSTART+RLENGTH, 1);
p = RSTART+RLENGTH;
if(!classic_underscore && match(mp,/_+/)) {
if(match(ms,/[[:alnum:]]/) && match(me,/[[:alnum:]]/)) {
tg = substr(st, 1, index(st, mp));
r = r tg;
st = substr(st, index(st, mp) + 1);
continue;
}
}
st = substr(st, p);
r = r a;
ms = "";
if(mp == "\\") {
if(match(st, /^!?\[/)) {
r = r "\\" substr(st, RSTART, RLENGTH);
st = substr(st, 2);
} else if(match(st, /^(\*\*|__|~~|`+)/)) {
r = r substr(st, 1, RLENGTH);
st = substr(st, RLENGTH+1);
} else {
r = r substr(st, 1, 1);
st = substr(st, 2);
}
continue;
} else if(mp == "_" || mp == "*") {
if(match(me,/[[:space:]]/)) {
r = r mp;
continue;
}
p = index(st, mp);
while(p && match(substr(st, p-1, 1),/[\\[:space:]]/)) {
ms = ms substr(st, 1, p-1) mp;
st = substr(st, p + length(mp));
p = index(st, mp);
}
if(!p) {
r = r mp ms;
continue;
}
ms = ms substr(st,1,p-1);
r = r itag("em", scrub(ms));
st = substr(st,p+length(mp));
} else if(mp == "__" || mp == "**") {
if(match(me,/[[:space:]]/)) {
r = r mp;
continue;
}
p = index(st, mp);
while(p && match(substr(st, p-1, 1),/[\\[:space:]]/)) {
ms = ms substr(st, 1, p-1) mp;
st = substr(st, p + length(mp));
p = index(st, mp);
}
if(!p) {
r = r mp ms;
continue;
}
ms = ms substr(st,1,p-1);
r = r itag("strong", scrub(ms));
st = substr(st,p+length(mp));
} else if(mp == "~~") {
p = index(st, mp);
if(!p) {
r = r mp;
continue;
}
while(p && substr(st, p-1, 1) == "\\") {
ms = ms substr(st, 1, p-1) mp;
st = substr(st, p + length(mp));
p = index(st, mp);
}
ms = ms substr(st,1,p-1);
r = r itag("del", scrub(ms));
st = substr(st,p+length(mp));
} else if(match(mp, /`+/)) {
p = index(st, mp);
if(!p) {
r = r mp;
continue;
}
ms = substr(st,1,p-1);
r = r itag("code", escape(ms));
st = substr(st,p+length(mp));
} else if(Mathjax && match(mp, /\$+/)) {
tok = substr(mp, RSTART, RLENGTH);
p = index(st, mp);
if(!p) {
r = r mp;
continue;
}
ms = substr(st,1,p-1);
r = r tok escape(ms) tok;
st = substr(st,p+length(mp));
HasMathjax = 1;
} else if(Mathjax && mp=="\\(") {
p = index(st, "\\)");
if(!p) {
r = r mp;
continue;
}
ms = substr(st,1,p-1);
r = r "\\(" escape(ms) "\\)";
st = substr(st,p+length(mp));
HasMathjax = 1;
} else if(mp == ">") {
r = r ">";
} else if(mp == "<") {
p = index(st, ">");
if(!p) {
r = r "<";
continue;
}
tg = substr(st, 1, p - 1);
if(match(tg,/^[[:alpha:]]+[[:space:]]/)) {
a = trim(substr(tg,RSTART+RLENGTH-1));
tg = substr(tg,1,RLENGTH-1);
} else
a = "";
if(match(tolower(tg), "^/?(a|abbr|div|span|blockquote|pre|img|code|p|em|strong|sup|sub|del|ins|s|u|b|i|br|hr|ul|ol|li|table|thead|tfoot|tbody|tr|th|td|caption|column|col|colgroup|figure|figcaption|dl|dd|dt|mark|cite|q|var|samp|small|details|summary)$")) {
if(!match(tg, /\//)) {
if(match(a, /class="/)) {
sub(/class="/, "class=\"dawk-ex ", a);
} else {
if(a)
a = a " class=\"dawk-ex\""
else
a = "class=\"dawk-ex\""
}
r = r "<" tg " " a ">";
} else
r = r "<" tg ">";
} else if(match(tg, "^[[:alpha:]]+://[[:graph:]]+$")) {
if(!a) a = tg;
r = r "<a class=\"normal\" href=\"" tg "\">" a "</a>";
} else if(match(tg, "^[[:graph:]]+@[[:graph:]]+$")) {
if(!a) a = tg;
r = r "<a class=\"normal\" href=\"" obfuscate("mailto:" tg) "\">" obfuscate(a) "</a>";
} else {
r = r "<";
continue;
}
st = substr(st, p + 1);
} else if(mp == "&") {
if(match(st, /^[#[:alnum:]]+;/)) {
r = r "&" substr(st, 1, RLENGTH);
st = substr(st, RLENGTH+1);
} else {
r = r "&";
}
}
}
return r st;
}
function push(newmode) {Stack[StackTop++] = Mode; Mode = newmode;}
function pop() {Mode = Stack[--StackTop];Buf = ""; return Mode;}
function heading(level, st, res, href, u, text,svg) {
if(level > 6) level = 6;
st = trim(st);
href = tolower(st);
href = strip_tags(href);
gsub(/[^-_ [:alnum:]]+/, "", href);
gsub(/[[:space:]]/, "-", href);
if(TitleUrls[href]) {
for(u = 1; TitleUrls[href "-" u]; u++);
href = href "-" u;
}
TitleUrls[href] = "#" href;
svg = "<svg width=\"16\" height=\"16\" xmlns=\"http://www.w3.org/2000/svg\"><g transform=\"rotate(-30, 8, 8)\" stroke=\"#000000\" opacity=\"0.25\"><rect fill=\"none\" height=\"6\" width=\"8\" x=\"2\" y=\"6\" rx=\"1.5\"/><rect fill=\"none\" height=\"6\" width=\"8\" x=\"6\" y=\"4\" rx=\"1.5\"/></g></svg>";
text = "<a href=\"#" href "\" class=\"header\">" st " " svg "</a>" (TopLinks?" <a class=\"top\" title=\"Return to top\" href=\"#\">↑ Top</a>":"");
res = tag("h" level, text, "id=\"" href "\"");
for(;ToCLevel < level; ToCLevel++) {
ToC_ID++;
if(ToCLevel < HideToCLevel) {
ToC = ToC "<a class=\"toc-button no-print\" id=\"toc-btn-" ToC_ID "\" onclick=\"toggle_toc_ul('" ToC_ID "')\">▼</a>";
ToC = ToC "<ul class=\"toc toc-" ToCLevel "\" id=\"toc-ul-" ToC_ID "\">";
} else {
ToC = ToC "<a class=\"toc toc-button no-print\" id=\"toc-btn-" ToC_ID "\" onclick=\"toggle_toc_ul('" ToC_ID "')\">►</a>";
ToC = ToC "<ul style=\"display:none;\" class=\"toc toc-" ToCLevel "\" id=\"toc-ul-" ToC_ID "\">";
}
}
for(;ToCLevel > level; ToCLevel--)
ToC = ToC "</ul>";
ToC = ToC "<li class=\"toc-" level "\"><a class=\"toc toc-" level "\" href=\"#" href "\">" st "</a>\n";
ToCLevel = level;
return res;
}
function process_table_row(st ,cols, i) {
if(match(st, /^[[:space:]]*\|/))
st = substr(st, RSTART+RLENGTH);
if(match(st, /\|[[:space:]]*$/))
st = substr(st, 1, RSTART - 1);
st = trim(st);
if(match(st, /^([[:space:]:|]|---+)*$/)) {
IsHeaders[Row-1] = 1;
cols = split(st, A, /[[:space:]]*\|[[:space:]]*/)
for(i = 1; i <= cols; i++) {
if(match(A[i], /^:-*:$/))
Align[i] = "center";
else if(match(A[i], /^-*:$/))
Align[i] = "right";
else if(match(A[i], /^:-*$/))
Align[i] = "left";
}
return;
}
cols = split(st, A, /[[:space:]]*\|[[:space:]]*/);
for(i = 1; i <= cols; i++) {
Table[Row, i] = A[i];
}
NCols[Row] = cols;
if(cols > MaxCols)
MaxCols = cols;
IsHeaders[Row] = 0;
Row++;
}
function end_table( r,c,t,a,s) {
for(r = 1; r < Row; r++) {
t = IsHeaders[r] ? "th" : "td"
s = s "<tr>"
for(c = 1; c <= NCols[r]; c++) {
a = Align[c];
if(a)
s = s "<" t " align=\"" a "\">" scrub(Table[r,c]) "</" t ">"
else
s = s "<" t ">" scrub(Table[r,c]) "</" t ">"
}
s = s "</tr>\n"
}
return tag("table", s, "class=\"da\"");
}
function make_toc(st, r,p,dis,t,n,tocBody) {
if(!ToC) return st;
for(;ToCLevel > 1;ToCLevel--)
ToC = ToC "</ul>";
tocBody = "<ul class=\"toc toc-1\">" ToC "</ul>\n";
p = match(st, /!\[toc[-+]?\]/);
while(p) {
if(substr(st,RSTART-1,1) == "\\") {
r = r substr(st,1,RSTART-2) substr(st,RSTART,RLENGTH);
st = substr(st,RSTART+RLENGTH);
p = match(st, /!\[toc[-+]?\]/);
continue;
}
++n;
dis = index(substr(st,RSTART,RLENGTH),"+");
t = "<details id=\"table-of-contents\" class=\"no-print\">\n<summary id=\"toc-button-" n "\" class=\"toc-button\">Contents</summary>\n" \
tocBody "</details>";
t = t "\n<div class=\"print-only\">" tocBody "</div>"
r = r substr(st,1,RSTART-1);
r = r t;
st = substr(st,RSTART+RLENGTH);
p = match(st, /!\[toc[-+]?\]/);
}
return r st;
}
function fix_links(st, lt,ld,lr,url,img,res,rx,pos,pre) {
do {
pre = match(st, /<(pre|code)>/); # Don't substitute in <pre> or <code> blocks
pos = match(st, /\[[^\]]+\]/);
if(!pos)break;
if(pre && pre < pos) {
match(st, /<\/(pre|code)>/);
res = res substr(st,1,RSTART+RLENGTH);
st = substr(st, RSTART+RLENGTH+1);
continue;
}
img=substr(st,RSTART-1,1)=="!";
if(substr(st, RSTART-(img?2:1),1)=="\\") {
res = res substr(st,1,RSTART-(img?3:2));
if(img && substr(st,RSTART,RLENGTH)=="[toc]")res=res "\\";
res = res substr(st,RSTART-(img?1:0),RLENGTH+(img?1:0));
st = substr(st, RSTART + RLENGTH);
continue;
}
res = res substr(st, 1, RSTART-(img?2:1));
rx = substr(st, RSTART, RLENGTH);
st = substr(st, RSTART+RLENGTH);
if(match(st, /^[[:space:]]*\([^)]+\)/)) {
lt = substr(rx, 2, length(rx) - 2);
match(st, /\([^)]+\)/);
url = substr(st, RSTART+1, RLENGTH-2);
st = substr(st, RSTART+RLENGTH);
ld = "";
if(match(url,/[[:space:]]+["']/)) {
ld = url;
url = substr(url, 1, RSTART - 1);
match(ld,/["']/);
delim = substr(ld, RSTART, 1);
if(match(ld,delim ".*" delim))
ld = substr(ld, RSTART+1, RLENGTH-2);
} else ld = "";
if(img)
res = res "<img src=\"" url "\" title=\"" ld "\" alt=\"" lt "\">";
else
res = res "<a class=\"normal\" href=\"" url "\" title=\"" ld "\">" lt "</a>";
} else if(match(st, /^[[:space:]]*\[[^\]]*\]/)) {
lt = substr(rx, 2, length(rx) - 2);
match(st, /\[[^\]]*\]/);
lr = trim(tolower(substr(st, RSTART+1, RLENGTH-2)));
if(!lr) {
lr = tolower(trim(lt));
if(LinkDescs[lr]) lt = LinkDescs[lr];
}
st = substr(st, RSTART+RLENGTH);
url = LinkUrls[lr];
ld = LinkDescs[lr];
if(img)
res = res "<img src=\"" url "\" title=\"" ld "\" alt=\"" lt "\">";
else if(url)
res = res "<a class=\"normal\" href=\"" url "\" title=\"" ld "\">" lt "</a>";
else
res = res "[" lt "][" lr "]";
} else
res = res (img?"!":"") rx;
} while(pos > 0);
return res st;
}
function fix_footnotes(st, r,p,n,i,d,fn,fc) {
p = match(st, /\[\^[^\]]+\]/);
while(p) {
if(substr(st,RSTART-2,1) == "\\") {
r = r substr(st,1,RSTART-3) substr(st,RSTART,RLENGTH);
st = substr(st,RSTART+RLENGTH);
p = match(st, /\[\^[^\]]+\]/);
continue;
}
r = r substr(st,1,RSTART-1);
d = substr(st,RSTART+2,RLENGTH-3);
n = tolower(d);
st = substr(st,RSTART+RLENGTH);
if(Footnote[tolower(n)]) {
if(!fn[n]) fn[n] = ++fc;
d = Footnote[n];
} else {
Footnote[n] = scrub(d);
if(!fn[n]) fn[n] = ++fc;
}
footname[fc] = n;
d = strip_tags(d);
if(length(d) > 20) d = substr(d,1,20) "…";
r = r "<sup title=\"" d "\"><a href=\"#footnote-" fn[n] "\" id=\"footnote-pos-" fn[n] "\" class=\"footnote\">[" fn[n] "]</a></sup>";
p = match(st, /\[\^[^\]]+\]/);
}
for(i=1;i<=fc;i++)
footnotes = footnotes "<li id=\"footnote-" i "\">" Footnote[footname[i]] \
"<a title=\"Return to Document\" class=\"footnote-back\" href=\"#footnote-pos-" i \
"\"> ↶ Back</a></li>\n";
return r st;
}
function fix_abbrs(str, st,k,r,p) {
for(k in Abbrs) {
r = "";
st = str;
t = escape(Abbrs[toupper(k)]);
gsub(/&/,"\\&", t);
p = match(st,"[^[:alnum:]]" k "[^[:alnum:]]");
while(p) {
r = r substr(st, 1, RSTART);
r = r "<abbr title=\"" t "\">" k "</abbr>";
st = substr(st, RSTART+RLENGTH-1);
p = match(st,"[^[:alnum:]]" k "[^[:alnum:]]");
}
str = r st;
}
return str;
}
function tag(t, body, attr) {
if(attr)
attr = " " trim(attr);
# https://www.w3.org/TR/html5/grouping-content.html#the-p-element
if(t == "p" && (match(body, /<\/?(div|table|blockquote|dl|ol|ul|h[[:digit:]]|hr|pre)[>[:space:]]/))|| (match(body,/!\[toc\]/) && substr(body, RSTART-1,1) != "\\"))
return "<" t attr ">" body "\n";
else
return "<" t attr ">" body "</" t ">\n";
}
function itag(t, body) {
return "<" t ">" body "</" t ">";
}
function obfuscate(e, r,i,t,o) {
for(i = 1; i <= length(e); i++) {
t = substr(e,i,1);
r = int(rand() * 100);
if(r > 50)
o = o sprintf("&#x%02X;", _ord[t]);
else if(r > 10)
o = o sprintf("&#%d;", _ord[t]);
else
o = o t;
}
return o;
}
function init_css(Css, css,ss,hr,bg1,bg2,bg3,bg4,ff,fs,i,lt,dt) {
if(Css == "0") return "";
css["body"] = "color:var(--color);background:var(--background);font-family:%font-family%;font-size:%font-size%;line-height:1.5em;" \
"padding:1em 2em;width:80%;max-width:%maxwidth%;margin:0 auto;min-height:100%;float:none;";
css["h1"] = "border-bottom:1px solid var(--heading);padding:0.3em 0.1em;";
css["h1 a"] = "color:var(--heading);";
css["h2"] = "color:var(--heading);border-bottom:1px solid var(--heading);padding:0.2em 0.1em;";
css["h2 a"] = "color:var(--heading);";
css["h3"] = "color:var(--heading);border-bottom:1px solid var(--heading);padding:0.1em 0.1em;";
css["h3 a"] = "color:var(--heading);";
css["h4,h5,h6"] = "padding:0.1em 0.1em;";
css["h4 a,h5 a,h6 a"] = "color:var(--heading);";
css["h1,h2,h3,h4,h5,h6"] = "font-weight:bolder;line-height:1.2em;";
css["h4"] = "border-bottom:1px solid var(--heading)";
css["p"] = "margin:0.5em 0.1em;"
css["hr"] = "background:var(--color);height:1px;border:0;"
css["a.normal, a.toc"] = "color:var(--alt-color);";
#css["a.normal:visited"] = "color:var(--heading);";
#css["a.normal:active"] = "color:var(--heading);";
css["a.normal:hover, a.toc:hover"] = "color:var(--alt-color);";
css["a.top"] = "font-size:x-small;text-decoration:initial;float:right;";
css["a.header svg"] = "opacity:0;";
css["a.header:hover svg"] = "opacity:1;";
css["a.header"] = "text-decoration: none;";
css["a.dark-toggle"] = "float:right; cursor: pointer; font-size: small; padding: 0.3em 0.5em 0.5em 0.5em; font-family: monospace; border-radius: 3px;";
css["a.dark-toggle:hover"] = "background:var(--alt-background);";
css[".toc-button"] = "color:var(--alt-color);cursor:pointer;font-size:small;padding: 0.3em 0.5em 0.5em 0.5em;font-family:monospace;border-radius:3px;";
css["a.toc-button:hover"] = "background:var(--alt-background);";
css["a.footnote"] = "font-size:smaller;text-decoration:initial;";
css["a.footnote-back"] = "text-decoration:initial;font-size:x-small;";
css["strong,b"] = "color:var(--color)";
css["code"] = "color:var(--alt-color);font-weight:bold;";
css["blockquote"] = "margin-left:1em;color:var(--alt-color);border-left:0.2em solid var(--alt-color);padding:0.25em 0.5em;overflow-x:auto;";
css["pre"] = "color:var(--alt-color);background:var(--alt-background);border:1px solid;border-radius:2px;line-height:1.25em;margin:0.25em 0.5em;padding:0.75em;overflow-x:auto;";
css["table.dawk-ex"] = "border-collapse:collapse;margin:0.5em;";
css["th.dawk-ex,td.dawk-ex"] = "padding:0.5em 0.75em;border:1px solid var(--heading);";
css["th.dawk-ex"] = "color:var(--heading);border:1px solid var(--heading);border-bottom:2px solid var(--heading);";
css["tr.dawk-ex:nth-child(odd)"] = "background-color:var(--alt-background);";
css["table.da"] = "border-collapse:collapse;margin:0.5em;";
css["table.da th,td"] = "padding:0.5em 0.75em;border:1px solid var(--heading);";
css["table.da th"] = "color:var(--heading);border:1px solid var(--heading);border-bottom:2px solid var(--heading);";
css["table.da tr:nth-child(odd)"] = "background-color:var(--alt-background);";
css["div.dawk-ex"] = "padding:0.5em;";
css["caption.dawk-ex"] = "padding:0.5em;font-style:italic;";
css["dl.dawk-ex"] = "margin:0.5em;";
css["dt.dawk-ex"] = "font-weight:bold;";
css["dd.dawk-ex"] = "padding:0.3em;";
css["mark.dawk-ex"] = "color:var(--alt-background);background-color:var(--heading);";
css["del.dawk-ex,s.dawk-ex"] = "color:var(--heading);";
css["div#table-of-contents"] = "padding:0;font-size:smaller;";
css["abbr"] = "cursor:help;";
css["ol.footnotes"] = "font-size:small;color:var(--alt-color)";
css[".fade"] = "color:var(--alt-background);";
css[".highlight"] = "color:var(--alt-color);background-color:var(--alt-background);";
css["summary"] = "cursor:pointer;";
css["ul.toc"] = "list-style-type:none;";
# This is a trick to prevent page-breaks immediately after headers
# https://stackoverflow.com/a/53742871/115589
css["blockquote,code,pre,table"] = "break-inside: avoid;break-before: auto;"
css["section"] = "break-inside: avoid;break-before: auto;"
css["h1,h2,h3,h4"] = "break-inside: avoid;";
css["h1::after,h2::after,h3::after,h4::after"] = "content: \"\";display: block;height: 200px;margin-bottom: -200px;";
if(NumberHeadings) {
if(NumberH1s) {
css["body"] = css["body"] "counter-reset: h1 toc1;";
css["h1"] = css["h1"] "counter-reset: h2 h3 h4;";