Text to HTML: Difference between revisions
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{{Draft task|Text processing}}
When developing a Website it is occasionally necessary to handle text that is received without formatting, and present it in a pleasing manner. to achieve this the text needs to be converted to HTML.
Line 14 ⟶ 13:
The only requirement is to ensure that the result is valid xhtml.
=={{header|Go}}==
This isn't very sophisticated but does a few things in a simple-minded way.
<syntaxhighlight lang="go">package main
import (
"fmt"
"html"
"regexp"
"strings"
)
var t = ` Sample Text
This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.
* This is a bulleted list with a less than sign (<)
* And this is its second line with a greater than sign (>)
A 'normal' paragraph between the lists.
1. This is a numbered list with an ampersand (&)
2. "Second line" in double quotes
3. 'Third line' in single quotes
That's all folks.`
func main() {
p := regexp.MustCompile(`\n\s*(\n\s*)+`)
ul := regexp.MustCompile(`^\*`)
ol := regexp.MustCompile(`^\d\.`)
t = html.EscapeString(t) // escape <, >, &, " and '
paras := p.Split(t, -1)
// Assume if first character of first paragraph is white-space
// then it's probably a document title.
firstChar := paras[0][0]
title := "Untitled"
k := 0
if firstChar == ' ' || firstChar == '\t' {
title = strings.TrimSpace(paras[0])
k = 1
}
fmt.Println("<html>")
fmt.Printf("<head><title>%s</title></head>\n", title)
fmt.Println("<body>")
blist := false
nlist := false
for _, para := range paras[k:] {
para2 := strings.TrimSpace(para)
if ul.MatchString(para2) {
if !blist {
blist = true
fmt.Println("<ul>")
}
para2 = strings.TrimSpace(para2[1:])
fmt.Printf(" <li>%s</li>\n", para2)
continue
} else if blist {
blist = false
fmt.Println("</ul>")
}
if ol.MatchString(para2) {
if !nlist {
nlist = true
fmt.Println("<ol>")
}
para2 = strings.TrimSpace(para2[2:])
fmt.Printf(" <li>%s</li>\n", para2)
continue
} else if nlist {
nlist = false
fmt.Println("</ol>")
}
if !blist && !nlist {
fmt.Printf("<p>%s</p>\n", para2)
}
}
if blist {
fmt.Println("</ul>")
}
if nlist {
fmt.Println("</ol>")
}
fmt.Println("</body>")
fmt.Println("</html>")
}</syntaxhighlight>
{{out}}
<syntaxhighlight lang="html"><html>
<head><title>Sample Text</title></head>
<body>
<p>This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.</p>
<ul>
<li>This is a bulleted list with a less than sign (<)</li>
<li>And this is its second line with a greater than sign (>)</li>
</ul>
<p>A 'normal' paragraph between the lists.</p>
<ol>
<li>This is a numbered list with an ampersand (&)</li>
<li>"Second line" in double quotes</li>
<li>'Third line' in single quotes</li>
</ol>
<p>That's all folks.</p>
</body>
</html></syntaxhighlight>
=={{header|Julia}}==
{{trans|Go}}
<syntaxhighlight lang="julia">using HttpCommon, Printf
const exampletxt = """ Sample Text
This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.
* This is a bulleted list with a less than sign (<)
* And this is its second line with a greater than sign (>)
A 'normal' paragraph between the lists.
1. This is a numbered list with an ampersand (&)
2. "Second line" in double quotes
3. 'Third line' in single quotes
That's all folks."""
function txt_to_html(t = exampletxt)
p = r"\n\s*(\n\s*)+"
ul = r"^\*"
ol = r"^\d\."
paras = map(p -> escapeHTML(string(p)), split(t, r"[\r\n]+"))
# Assume if first character of first paragraph is white-space
# then it's probably a document title.
firstchar = first(first(paras))
title = "Untitled"
k = 1
if firstchar == ' ' || firstchar == '\t'
title = strip(paras[1])
k = 2
end
println("<html>")
@printf("<head><title>%s</title></head>\n", title)
println("<body>")
blist, nlist = false, false
for para in @view paras[k:end]
para2 = strip(para)
if occursin(ul, para2)
if !blist
blist = true
println("<ul>")
end
para2 = strip(para2[2:end])
@printf(" <li>%s</li>\n", para2)
continue
elseif blist
blist = false
println("</ul>")
end
if occursin(ol, para2)
if !nlist
nlist = true
println("<ol>")
end
para2 = strip(para2[3:end])
@printf(" <li>%s</li>\n", para2)
continue
elseif nlist
nlist = false
println("</ol>")
end
if !blist && !nlist
@printf("<p>%s</p>\n", para2)
end
end
if blist
println("</ul>")
end
if nlist
println("</ol>")
end
println("</body>")
println("</html>")
end
txt_to_html()
</syntaxhighlight>{{out}}
<pre>
<html>
<head><title>Sample Text</title></head>
<body>
<p>This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.</p>
<ul>
<li>This is a bulleted list with a less than sign (<)</li>
<li>And this is its second line with a greater than sign (>)</li>
</ul>
<p>A 'normal' paragraph between the lists.</p>
<ol>
<li>This is a numbered list with an ampersand (&)</li>
<li>"Second line" in double quotes</li>
<li>'Third line' in single quotes</li>
</ol>
<p>That's all folks.</p>
</body>
</html>
</pre>
=={{header|Nim}}==
{{trans|Go}}
<syntaxhighlight lang="nim">import re, strutils, xmltree
const Text = """ Sample Text
This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.
* This is a bulleted list with a less than sign (<)
* And this is its second line with a greater than sign (>)
A 'normal' paragraph between the lists.
1. This is a numbered list with an ampersand (&)
2. "Second line" in double quotes
3. 'Third line' in single quotes
That's all folks."""
let p = re"\n\s*(\n\s*)+"
let ul = re"^\*"
let ol = re"^\d\."
let text = xmltree.escape(Text)
let paras = text.split(p)
# Assume if first character of first paragraph is white-space
# then it's probably a document title.
let firstChar = paras[0][0]
var titleString = "untitled"
var start = 0
if firstChar.isSpaceAscii:
titleString = paras[0].strip()
start = 1
echo "<html>"
echo "<head><title>", titleString, "</title></body>"
echo "<body>"
var blist, nlist = false
for ipara in start..paras.high:
var para = paras[ipara].strip()
if para.find(ul) >= 0:
if not blist:
blist = true
echo "<ul>"
echo " <li>", para[1..^1].strip(), "</li>"
continue
elif blist:
blist = false
echo "</ul>"
if para.find(ol) >= 0:
if not nlist:
nlist = true
echo "<ol>"
echo " <li>", para[2..^1].strip(), "</li>"
continue
elif nlist:
nlist = false
echo "</ol>"
if not (blist or nlist):
echo "<p>", para, "</p>"
if blist: echo "</ul>"
if nlist: echo "</ol>"
echo "</body>"
echo "</html>"</syntaxhighlight>
{{out}}
<pre><html>
<head><title>Sample Text</title></body>
<body>
<p>This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.</p>
<ul>
<li>This is a bulleted list with a less than sign (<)</li>
<li>And this is its second line with a greater than sign (>)</li>
</ul>
<p>A 'normal' paragraph between the lists.</p>
<ol>
<li>This is a numbered list with an ampersand (&)</li>
<li>"Second line" in double quotes</li>
<li>'Third line' in single quotes</li>
</ol>
<p>That's all folks.</p>
</body>
</html></pre>
=={{header|Perl}}==
{{trans|Raku}}
<syntaxhighlight lang="perl"># 20201023 added Perl programming solution
use strict;
use warnings;
use Pod::Simple::HTML;
# POD example taken from https://juerd.nl/site.plp/perlpodtut
my $pod = <<'POD';
=head1 NAME
My::Module - An example module
=head1 SYNOPSIS
use My::Module;
my $object = My::Module->new();
print $object->as_string;
=head1 DESCRIPTION
This module does not really exist, it
was made for the sole purpose of
demonstrating how POD works.
=head2 Methods
=over 12
=item C<new>
Returns a new My::Module object.
=item C<as_string>
Returns a stringified representation of
the object. This is mainly for debugging
purposes.
=back
=head1 LICENSE
This is released under the Artistic
License. See L<perlartistic>.
=head1 AUTHOR
Juerd - L<http://juerd.nl/>
=head1 SEE ALSO
L<perlpod>, L<perlpodspec>
=cut
POD
my $parser = Pod::Simple::HTML->new();
$parser->output_fh(*STDOUT);
$parser->parse_string_document($pod)</syntaxhighlight>
=={{header|Phix}}==
The best thing to do here is to keep it utterly trivial.
<!--<syntaxhighlight lang="phix">(phixonline)-->
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">constant</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">hchars</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hsubs</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">columnize</span><span style="color: #0000FF;">({{</span><span style="color: #008000;">"&"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"&amp;"</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"<"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"&lt;"</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">">"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"&gt;"</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"\""</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"&dquo;"</span><span style="color: #0000FF;">},</span>
<span style="color: #0000FF;">{</span><span style="color: #008000;">"\'"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"&squo;"</span><span style="color: #0000FF;">}})</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">fmt</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
<html>
<head><title>%s</title></head>
<body>
<pre>
%s
</pre>
</body>
</html>
"""</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">text_to_html_page</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">title</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">text</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">title</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">substitute_all</span><span style="color: #0000FF;">(</span><span style="color: #000000;">title</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hchars</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hsubs</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">text</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">substitute_all</span><span style="color: #0000FF;">(</span><span style="color: #000000;">text</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hchars</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hsubs</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">return</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fmt</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">title</span><span style="color: #0000FF;">,</span><span style="color: #000000;">text</span><span style="color: #0000FF;">})</span>
<span style="color: #000080;font-style:italic;">-- return substitute_all(sprintf(fmt,{title,text}),hchars,hsubs)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">text</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
This is
a paragraph
a block of
code
* A one-bullet list
> With quoted text
>
> and code
"""</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">text_to_html_page</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"my title"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">text</span><span style="color: #0000FF;">))</span>
<!--</syntaxhighlight>-->
{{out}}
The last line of text_to_html() (as commented out) was used to generate the
sanitised version of the output, as needed for inclusion on this page.
<pre>
<html>
<head><title>my title</title></head>
<body>
<pre>
This is
a paragraph
a block of
code
* A one-bullet list
&gt; With quoted text
&gt;
&gt; and code
</pre>
</body>
</html>
</pre>
=={{header|Pike}}==
Line 33 ⟶ 474:
this implementation is still incomplete.
<
int linelength(array lines)
{
Line 150 ⟶ 591:
}
return root;
}</
=={{header|Racket}}==
This task seems like it's very under-defined, but the discussion seems to be headed towards a simple markdown specification.
I therefore do this with a small interface to [https://github.com/jgm/cmark cmark] to render [http://commonmark.org/ commonmark] text.
(Note that this is not some cooked code, it's coming from code that I'm using to render class notes, and hopefully it will be useful to have such an example here.
It certainly seems to me as a useful thing compared to some half-baked not-really-markdown-or-anything implementation.)
<syntaxhighlight lang="racket">
#lang at-exp racket
(require ffi/unsafe ffi/unsafe/define)
(define-ffi-definer defcmark (ffi-lib "libcmark"))
(define _cmark_opts
(_bitmask '(sourcepos = 1 hardbreaks = 2 normalize = 4 smart = 8)))
(define-cpointer-type _node)
(defcmark cmark_markdown_to_html
(_fun [bs : _bytes] [_int = (bytes-length bs)] _cmark_opts
-> [r : _bytes] -> (begin0 (bytes->string/utf-8 r) (free r))))
(define (cmark-markdown-to-html #:options [opts '(normalize smart)] . text)
(cmark_markdown_to_html (string->bytes/utf-8 (string-append* text)) opts))
(display @cmark-markdown-to-html{
This is
a paragraph
a block of
code
* A one-bullet list
> With quoted text
>
> and code
})
</syntaxhighlight>
{{out}}
<pre>
<p>This is
a paragraph</p>
<pre><code>a block of
code
</code></pre>
<ul>
<li>A one-bullet list
<blockquote>
<p>With quoted text</p>
<pre><code>and code
</code></pre>
</blockquote>
</li>
</ul>
</pre>
=={{header|Raku}}==
(formerly Perl 6)
{{works with|Rakudo|2019.11}}
The task specs are essentially non-existent. "Make a best guess at how to render mark-up free text"? Anything that could be trusted at all would either be extremely trivial or insanely complex. And it shows by the the task example writers staying away in droves. Five examples after seven years!?
Rather than waste time on that noise, I'll demonstrate POD6 to HTML conversion. POD6 is a simple, text-only mark-up used for Raku documentation. (It's Plain Old Documentation for Raku) It uses pretty simple textual markup and has multiple tools to convert the POD6 document in to many other formats, HTML among them.
It is '''not''' markup free, but it is actually usable in production.
<syntaxhighlight lang="raku" line>use Pod::To::HTML;
use HTML::Escape;
my $pod6 = q:to/POD6/;
=begin pod
A very simple Pod6 document.
This is a very high-level, hand-wavey overview. There are I<lots> of other
options available.
=head1 Section headings
=head1 A top level heading
=head2 A second level heading
=head3 A third level heading
=head4 A fourth level heading
=head1 Text
Ordinary paragraphs do not require an explicit marker or delimiters.
Alternatively, there is also an explicit =para marker that can be used to
explicitly mark a paragraph.
=para
This is an ordinary paragraph.
Its text will be squeezed and
short lines filled.
=head1 Code
Enclose code in a =code block (or V<C< >> markup for short, inline samples)
=begin code
my $name = 'Rakudo';
say $name;
=end code
=head1 Lists
=head3 Unordered lists
=item Grumpy
=item Dopey
=item Doc
=item Happy
=item Bashful
=item Sneezy
=item Sleepy
=head3 Multi-level lists
=item1 Animal
=item2 Vertebrate
=item2 Invertebrate
=item1 Phase
=item2 Solid
=item2 Liquid
=item2 Gas
=head1 Formatting codes
Formatting codes provide a way to add inline mark-up to a piece of text.
All Pod6 formatting codes consist of a single capital letter followed
immediately by a set of single or double angle brackets; Unicode double angle
brackets may be used.
Formatting codes may nest other formatting codes.
There are many formatting codes available, some of the more common ones:
=item1 V<B< >> Bold
=item1 V<I< >> Italic
=item1 V<U< >> Underline
=item1 V<C< >> Code
=item1 V<L< >> Hyperlink
=item1 V<V< >> Verbatim (Don't interpret anything inside as POD markup)
=head1 Tables
There is quite extensive markup to allow rendering tables.
A simple example:
=begin table :caption<Mystery Men>
The Shoveller Eddie Stevens King Arthur's singing shovel
Blue Raja Geoffrey Smith Master of cutlery
Mr Furious Roy Orson Ticking time bomb of fury
The Bowler Carol Pinnsler Haunted bowling ball
=end table
=end pod
POD6
# for display on Rosettacode
say escape-html render($pod6);
# normally
#say render($pod6);</syntaxhighlight>
{{out|Returns something like}}
<pre><!doctype html>
<html lang="en">
<head>
<title></title>
<meta charset="UTF-8" />
<style>
kbd { font-family: "Droid Sans Mono", "Luxi Mono", "Inconsolata", monospace }
samp { font-family: "Terminus", "Courier", "Lucida Console", monospace }
u { text-decoration: none }
.nested {
margin-left: 3em;
}
aside, u { opacity: 0.7 }
a[id^="fn-"]:target { background: #ff0 }
</style>
<link rel="stylesheet" href="//design.raku.org/perl.css">
</head>
<body class="pod">
<div id="___top"></div>
<nav class="indexgroup">
<table id="TOC">
<caption><h2 id="TOC_Title">Table of Contents</h2></caption>
<tr class="toc-level-1"><td class="toc-number">1</td><td class="toc-text"><a href="#Section_headings">Section headings</a></td></tr>
<tr class="toc-level-1"><td class="toc-number">2</td><td class="toc-text"><a href="#A_top_level_heading">A top level heading</a></td></tr>
<tr class="toc-level-2"><td class="toc-number">2.1</td><td class="toc-text"><a href="#A_second_level_heading">A second level heading</a></td></tr>
<tr class="toc-level-3"><td class="toc-number">2.1.1</td><td class="toc-text"><a href="#A_third_level_heading">A third level heading</a></td></tr>
<tr class="toc-level-4"><td class="toc-number">2.1.1.1</td><td class="toc-text"><a href="#A_fourth_level_heading">A fourth level heading</a></td></tr>
<tr class="toc-level-1"><td class="toc-number">3</td><td class="toc-text"><a href="#Text">Text</a></td></tr>
<tr class="toc-level-1"><td class="toc-number">4</td><td class="toc-text"><a href="#Code">Code</a></td></tr>
<tr class="toc-level-1"><td class="toc-number">5</td><td class="toc-text"><a href="#Lists">Lists</a></td></tr>
<tr class="toc-level-3"><td class="toc-number">5.0.1</td><td class="toc-text"><a href="#Unordered_lists">Unordered lists</a></td></tr>
<tr class="toc-level-3"><td class="toc-number">5.0.2</td><td class="toc-text"><a href="#Multi-level_lists">Multi-level lists</a></td></tr>
<tr class="toc-level-1"><td class="toc-number">6</td><td class="toc-text"><a href="#Formatting_codes">Formatting codes</a></td></tr>
<tr class="toc-level-1"><td class="toc-number">7</td><td class="toc-text"><a href="#Tables">Tables</a></td></tr>
</table>
</nav>
<div class="pod-body">
<p>A very simple Pod6 document.</p>
<p>This is a very high-level, hand-wavey overview. There are <em>lots</em> of other options available.</p>
<h1 id="Section_headings"><a class="u" href="#___top" title="go to top of document">Section headings</a></h1>
<h1 id="A_top_level_heading"><a class="u" href="#___top" title="go to top of document">A top level heading</a></h1>
<h2 id="A_second_level_heading"><a class="u" href="#___top" title="go to top of document">A second level heading</a></h2>
<h3 id="A_third_level_heading"><a class="u" href="#___top" title="go to top of document">A third level heading</a></h3>
<h4 id="A_fourth_level_heading"><a class="u" href="#___top" title="go to top of document">A fourth level heading</a></h4>
<h1 id="Text"><a class="u" href="#___top" title="go to top of document">Text</a></h1>
<p>Ordinary paragraphs do not require an explicit marker or delimiters.</p>
<p>Alternatively, there is also an explicit =para marker that can be used to explicitly mark a paragraph.</p>
<p>This is an ordinary paragraph. Its text will be squeezed and short lines filled.</p>
<h1 id="Code"><a class="u" href="#___top" title="go to top of document">Code</a></h1>
<p>Enclose code in a =code block (or C&lt; &gt; markup for short, inline samples)</p>
<pre class="pod-block-code"> my $name = &#39;Rakudo&#39;;
say $name;
</pre>
<h1 id="Lists"><a class="u" href="#___top" title="go to top of document">Lists</a></h1>
<h3 id="Unordered_lists"><a class="u" href="#___top" title="go to top of document">Unordered lists</a></h3>
<ul><li><p>Grumpy</p>
</li>
<li><p>Dopey</p>
</li>
<li><p>Doc</p>
</li>
<li><p>Happy</p>
</li>
<li><p>Bashful</p>
</li>
<li><p>Sneezy</p>
</li>
<li><p>Sleepy</p>
</li>
</ul>
<h3 id="Multi-level_lists"><a class="u" href="#___top" title="go to top of document">Multi-level lists</a></h3>
<ul><li><p>Animal</p>
</li>
<ul><li><p>Vertebrate</p>
</li>
<li><p>Invertebrate</p>
</li>
</ul>
<li><p>Phase</p>
</li>
<ul><li><p>Solid</p>
</li>
<li><p>Liquid</p>
</li>
<li><p>Gas</p>
</li>
</ul>
</ul>
<h1 id="Formatting_codes"><a class="u" href="#___top" title="go to top of document">Formatting codes</a></h1>
<p>Formatting codes provide a way to add inline mark-up to a piece of text.</p>
<p>All Pod6 formatting codes consist of a single capital letter followed immediately by a set of single or double angle brackets; Unicode double angle brackets may be used.</p>
<p>Formatting codes may nest other formatting codes.</p>
<p>There are many formatting codes available, some of the more common ones:</p>
<ul><li><p>B&lt; &gt; Bold</p>
</li>
<li><p>I&lt; &gt; Italic</p>
</li>
<li><p>U&lt; &gt; Underline</p>
</li>
<li><p>C&lt; &gt; Code</p>
</li>
<li><p>L&lt; &gt; Hyperlink</p>
</li>
<li><p>V&lt; &gt; Verbatim (Don&#39;t interpret anything inside as POD markup)</p>
</li>
</ul>
<h1 id="Tables"><a class="u" href="#___top" title="go to top of document">Tables</a></h1>
<p>There is quite extensive markup to allow rendering tables.</p>
<p>A simple example:</p>
<table class="pod-table">
<caption>Mystery Men</caption>
<tbody>
<tr> <td>The Shoveller</td> <td>Eddie Stevens</td> <td>King Arthur&#39;s singing shovel</td> </tr> <tr> <td>Blue Raja</td> <td>Geoffrey Smith</td> <td>Master of cutlery</td> </tr> <tr> <td>Mr Furious</td> <td>Roy Orson</td> <td>Ticking time bomb of fury</td> </tr> <tr> <td>The Bowler</td> <td>Carol Pinnsler</td> <td>Haunted bowling ball</td> </tr>
</tbody>
</table>
</div>
</body>
</html></pre>
=={{header|Tcl}}==
This renderer doesn't do all that much. Indeed, it deliberately avoids doing all the complexity that is possible; instead it seeks to just provide the minimum that could possibly be useful to someone who is doing very simple text pages.
<syntaxhighlight lang="tcl">package require Tcl 8.5
proc splitParagraphs {text} {
split [regsub -all {\n\s*(\n\s*)+} [string trim $text] \u0000] "\u0000"
}
proc determineParagraph {para} {
set para [regsub -all {\s*\n\s*} $para " "]
switch -regexp -- $para {
{^\s*\*+\s} {
return [list ul [string trimleft $para " \t*"]]
}
{^\s*\d+\.\s} {
set para [string trimleft $para " \t\n0123456789"]
set para [string range $para 1 end]
return [list ol [string trimleft $para " \t"]]
}
{^#+\s} {
return [list heading [string trimleft $para " \t#"]]
}
}
return [list normal $para]
}
proc markupParagraphContent {para} {
set para [string map {& & < < > >} $para]
regsub -all {_([\w&;]+)_} $para {<i>\1</i>} para
regsub -all {\*([\w&;]+)\*} $para {<b>\1</b>} para
regsub -all {`([\w&;]+)`} $para {<tt>\1</tt>} para
return $para
}
proc markupText {title text} {
set title [string map {& & < < > >} $title]
set result "<html>"
append result "<head><title>" $title "</title>\n</head>"
append result "<body>" "<h1>$title</h1>\n"
set state normal
foreach para [splitParagraphs $text] {
lassign [determineParagraph $para] type para
set para [markupParagraphContent $para]
switch $state,$type {
normal,normal {append result "<p>" $para "</p>\n"}
normal,heading {
append result "<h2>" $para "</h2>\n"
set type normal
}
normal,ol {append result "<ol>" "<li>" $para "</li>\n"}
normal,ul {append result "<ul>" "<li>" $para "</li>\n"}
ul,normal {append result "</ul>" "<p>" $para "</p>\n"}
ul,heading {
append result "</ul>" "<h2>" $para "</h2>\n"
set type normal
}
ul,ol {append result "</ul>" "<ol>" "<li>" $para "</li>\n"}
ul,ul {append result "<li>" $para "</li>\n"}
ol,normal {append result "</ol>" "<p>" $para "</p>\n"}
ol,heading {
append result "</ol>" "<h2>" $para "</h2>\n"
set type normal
}
ol,ol {append result "<li>" $para "</li>\n"}
ol,ul {append result "</ol>" "<ul>" "<li>" $para "</li>\n"}
}
set state $type
}
if {$state ne "normal"} {
append result "</$state>"
}
return [append result "</body></html>"]
}</syntaxhighlight>
Here's an example of how it would be used.
<syntaxhighlight lang="tcl">set sample "
This is an example of how a pseudo-markdown-ish formatting scheme could
work. It's really much simpler than markdown, but does support a few things.
# Block paragraph types
* This is a bulleted list
* And this is the second item in it
1. Here's a numbered list
2. Second item
3. Third item
# Inline formatting types
The formatter can render text with _italics_, *bold* and in a `typewriter`
font. It also does the right thing with <angle brackets> and &ersands,
but relies on the encoding of the characters to be conveyed separately."
puts [markupText "Sample" $sample]</syntaxhighlight>
{{out}}
<syntaxhighlight lang="html"><html><head><title>Sample</title>
</head><body><h1>Sample</h1>
<p>This is an example of how a pseudo-markdown-ish formatting scheme could work. It's really much simpler than markdown, but does support a few things.</p>
<h2>Block paragraph types</h2>
<ul><li>This is a bulleted list</li>
<li>And this is the second item in it</li>
</ul><ol><li>Here's a numbered list</li>
<li>Second item</li>
<li>Third item</li>
</ol><h2>Inline formatting types</h2>
<p>The formatter can render text with <i>italics</i>, <b>bold</b> and in a <tt>typewriter</tt> font. It also does the right thing with <angle brackets> and &amp;ersands, but relies on the encoding of the characters to be conveyed separately.</p>
</body></html></syntaxhighlight>
=={{header|Wren}}==
{{trans|Go}}
{{libheader|Wren-pattern}}
<syntaxhighlight lang="wren">import "./pattern" for Pattern
var t = """ Sample Text
This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.
* This is a bulleted list with a less than sign (<)
* And this is its second line with a greater than sign (>)
A 'normal' paragraph between the lists.
1. This is a numbered list with an ampersand (&)
2. "Second line" in double quotes
3. 'Third line' in single quotes
That's all folks."""
// prefer the standard " for escaping a double-quote character rather than Go's "
var escapes = [ ["&", "&"], ["<", "<"], [">", ">"], ["\"", """], ["'", "'"] ]
for (esc in escapes) t = t.replace(esc[0], esc[1])
var paras = t.split("\n\n")
var ol = Pattern.new("/d.", Pattern.start)
// Assume if first character of first paragraph is white-space
// then it's probably a document title.
var firstChar = paras[0][0]
var title = "Untitled"
var k = 0
if (firstChar == " " || firstChar == "\t") {
title = paras[0].trim()
k = 1
}
System.print("<html>")
System.print("<head><title>%(title)</title></head>")
System.print("<body>")
var blist = false
var nlist = false
for (para in paras.skip(k)) {
var para2 = para.trim()
var cont = false
if (para2.startsWith("*")) {
if (!blist) {
blist = true
System.print("<ul>")
}
para2 = para2[1..-1].trim()
System.print(" <li>%(para2)</li>")
cont = true
} else if (blist) {
blist = false
System.print("</ul>")
}
if (!cont) {
if (ol.isMatch(para2)) {
if (!nlist) {
nlist = true
System.print("<ol>")
}
para2 = para2[2..-1].trim()
System.print(" <li>%(para2)</li>")
cont = true
} else if (nlist) {
nlist = false
System.print("</ol>")
}
if (!cont && !blist && !nlist) System.print("<p>%(para2)</p>")
}
}
if (blist) System.print("</ul>")
if (nlist) System.prin("</ol>")
System.print("</body>")
System.print("</html>")
</syntaxhighlight>
{{out}}
<pre>
<html>
<head><title>Sample Text</title></head>
<body>
<p>This is an example of converting plain text to HTML which demonstrates extracting a title and escaping certain characters within bulleted and numbered lists.</p>
<ul>
<li>This is a bulleted list with a less than sign (<)</li>
<li>And this is its second line with a greater than sign (>)</li>
</ul>
<p>A 'normal' paragraph between the lists.</p>
<ol>
<li>This is a numbered list with an ampersand (&)</li>
<li>"Second line" in double quotes</li>
<li>'Third line' in single quotes</li>
</ol>
<p>That's all folks.</p>
</body>
</html>
</pre>
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