docs/README.html

<!doctype html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>Markdown Viewer</title>
	<meta name="version" content="9.1">
	<link rel="stylesheet" href="assets/style.css">
	<link rel="stylesheet" href="style.css">
	<script type="text/javascript" src="assets/libs.js"></script>
	<script type="text/javascript" src="assets/w3.js"></script>
</head>
<body>

	<footer>
		<!-- COPYRIGHT SECTION BEGIN -->
		<!--
		IMPORTANT:
		Please, do not modify the copyright section.
		The copyright parts of the markdown viewer software is about the technical software itself, not the markdown contents that it renders.
		(The copyright fragments are not rendered in printing mode.)
		As the credit goes to the team who have put time/effort to develop the tool, their names should not be removed.
		Based on the license, the tool can be used/distributed while respecting the copyright notice.
		More people/organization names may be added if they also have a contribution on this tool.
		Development repository: https://github.com/ioi-2017/markdown-viewer
		-->
		<p id="copyright">@copyright IOI 2017</p>
		<div class="credit" id="credit-container" style="width: 420px;">
			<div style="width: 100%; margin-bottom: 6px;">
				<div style="width: 100%; text-align: left;">
					<span style="font-size:20px; font-weight:bold;">
						Markdown Viewer
					</span>
				</div>
				<div>
					<span style="font-size:14px;">
						<span>Version: </span><span id="span_version_content">?</span>
					</span>
				</div>
			</div>
			<div>
				<p style="font-size:14px; padding:0; padding-right: 15px; text-align:left; margin: 0;">
					<span style="font-size:16px; font-weight:bold;">Credits:</span>
					<br/>
					<a href="http://ioi2017.org/" target="_blank" style="font-size:20px;">IOI 2017 Iran</a>
					<br/>
					<span style="font-size:16px;">Host Technical Committee</span>
					<br/>
					Hamid Zarrabi-Zadeh
					<br/>
					Ali Yadegari
					<br/>
					Kian Mirjalali
					<br/>
					Navid Saleh
				</p>
			</div>
			<div style="width:168px; float: right;">
				<a href="http://ioi2017.org/" target="_blank">
					<img src="assets/IOI-2017.svg" width="100%"/>
				</a>
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		<!-- COPYRIGHT SECTION END -->
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	<div id="main" class="markdown-body pdf">
		<div w3-include-html="header.html"></div>
		<div id="content" class="rendered_content" dir="ltr" lang="en"></div>
		<div id="error-message" style="display: none;text-align: center; font-size: 24px;">

# Sorry!

File "`__MD_PLACEHOLDER__`" is not available.

It is either not found in the current directory or could not be opened.
Local HTML file cannot access the markdown file (or any other files in the same directory) in modern browsers due to security reasons.
This was possible in Firefox versions below 68.

There are now two methods to handle this:

## The secure method: HTTP server setup

Run a minimal HTTP server:

* Using node:
  * Install [node](https://nodejs.org).
  * Install `http-server` by running "`npm install -g http-server`".
  * Start the HTTP server by executing "`http-server -p 8000`" in the directory of markdown viewer.

* Using python:
  * Install [python 3](https://www.python.org/).
  * Start the HTTP server by executing "`python -m http.server 8000`" in the directory of markdown viewer.

Then, open the markdown viewer HTML file using URL "`http://localhost:8000/__DOC_NAME_PLACEHOLDER__.html`".
You can replace 8000 with other available port numbers.
Note that a port number cannot be used more than once simultaneously in different servers.
If it is not pleasant
 to run multiple HTTP servers with separate port numbers for rendering different markdown files in several directories,
 you can run the HTTP server in a common parent directory,
 and open the markdown viewer files with relative addresses,
 e.g. "`http://localhost:8000/common/parent/path/to/__DOC_NAME_PLACEHOLDER__.html`".

You can also use browser extensions like
 [Web Server for Chrome](https://chrome.google.com/webstore/detail/web-server-for-chrome/ofhbbkphhbklhfoeikjpcbhemlocgigb).

## The insecure method: Allow accessing local files

** Warning: **
This method makes you vulnerable to attacks from downloaded HTML documents.

** Firefox: **
Open "`about:config`" and accept the risk to edit the configurations.
Search for "`security.fileuri.strict_origin_policy`" and set its value to `false`
 (the setting name was "`privacy.file_unique_origin`" in older versions of Firefox).

Other work-around ideas are welcome.

Contact through the issues in [the development repository](https://github.com/ioi-2017/markdown-viewer/).

		</div>
		<div w3-include-html="footer.html"></div>
	</div>
	<script>
		w3.includeHTML();

		var version_meta = document.querySelector('meta[name="version"]');
		if (version_meta)
			document.getElementById('span_version_content').textContent = version_meta.content;

		// Initialize Marked.js Renderer

		var renderer = new marked.Renderer();
		var original_table_renderer = renderer.table;

		// Enable resize option for images
		renderer.image = function(href, title, text) {
			var tags = '';
			if (title) {
				size = title.split('x');
				if (size[1])
					tags = 'width=' + size[0] + ' height=' + size[1];
				else
					tags = 'width=' + size[0];
			} else if (href && href.indexOf('=') != -1) {
				size = href.split('=')[1].split('x');
				href = href.split('=')[0];
				if (size[1])
					tags = 'width=' + size[0] + ' height=' + size[1];
				else
					tags = 'width=' + size[0];
			}
			return ('<div style="page-break-inside:avoid"><img src="' + href + '" alt="' + text + '" ' + tags + '></div>');
		};

		renderer.table = function(header, body) {
			var html = '';
			var tags = 'style="page-break-inside:avoid;"';
			if (header.search('%ltr%') < 0) {
				tags += ' dir="ltr"';
			} else {
				header = header.replace('%ltr%', '');
			}
			html = '<div ' + tags + '>' + original_table_renderer(header, body) + '</div>';
			return html;
		}


		// remove trailing newline in code blocks
		renderer.code = function(code, language) {
			return ('<pre style="page-break-inside:avoid;"><code>' + code + '</code></pre>');
		};

		// global options
		marked.setOptions({
			renderer: renderer,
			gfm: true,
			tables: true,
			breaks: false,
			pedantic: false,
			sanitize: false,
			smartLists: true,
			smartypants: false
		});

		var path = window.location.pathname;
		var html = path.split("/").pop();
		var docName = html.substr(0, html.lastIndexOf("."));
		var md = docName + ".md";
		var json_ = docName + ".json";

		function renderMarkdownText(text) {
			document.getElementById('content').innerHTML = marked(text);
			renderMathInElement(document.getElementById('content'));
		}

		function readTextFile(file, allowingEnv) {
			var rawFile = new XMLHttpRequest();
			rawFile.open("GET", file, true);
			rawFile.onreadystatechange = function() {
				if (rawFile.readyState === 4) {
					if (rawFile.status === 200) {
						renderMarkdownText(rawFile.responseText);
					} else if (allowingEnv || (rawFile.status === 404)) {
						document.getElementById("error-message").style.display = "block";
						document.getElementById("error-message").textContent = "'" + md + "' not found";
					} else {
						var message = document.getElementById("error-message").textContent;
						message = message.replace(/__MD_PLACEHOLDER__/g, md);
						message = message.replace(/__DOC_NAME_PLACEHOLDER__/g, docName);
						renderMarkdownText(message);
					}
				}
			}
			rawFile.send(null);
		}

		function readJsonProp(file) {
			var rawFile = new XMLHttpRequest();
			rawFile.open("GET", file, true);
			rawFile.onreadystatechange = function () {
				if (rawFile.readyState === 4) {
					if (rawFile.status === 200 || rawFile.status == 0) {
						var props = JSON.parse(rawFile.responseText);
						Object.keys(props).forEach(function(key) {
							var elem = document.getElementById("prop_"+key);
							if (elem)
								elem.textContent = props[key];
						})
					document.title = props["html_title"] ? props["html_title"] : "Markdown Viewer";
					}
				}
			}
			rawFile.send(null);
		}

		showingCredit = false;
		function showCredit() {
			document.getElementById('credit-container').style.display = "block";
			showingCredit=true;
		}
		function hideCredit(e) {
			document.getElementById('credit-container').style.display = "none";
			showingCredit=false;
		}
		function toggleCredit() {
			if (showingCredit)
				hideCredit();
			else
				showCredit();
		}

		document.addEventListener('click', function(e) {
			if (e.target.id!='copyright')
				hideCredit();
			else
				toggleCredit();
		}, false);


		function isOldFirefox() {
			var ua = window.navigator.userAgent;
			if (ua.toLowerCase().indexOf('firefox') <= -1)
				return false;
			var ua_match = ua.match(/Firefox\/([0-9]+)\./);
			var ver = ua_match ? parseInt(ua_match[1]) : 0;
			return (ver < 68);
		}

		function isLocalFile() {
			var url = window.location.href.split("/")[0];
			return (url == "file:");
		}

		readTextFile(md, !isLocalFile() || isOldFirefox());

		readJsonProp(json_);
	</script>
</body>
</html>