OMetaJS: Simple Markdown

markdown.js

var text = 
"hi\
===   \
### hi hi\
another\
--------\
\
hello\
\
\
    \
\
```\
<code>\
    hi\
</code>\
```\
";

// I would like to know how to do these: 
//
// \# Backslash escaping
//
ometa MarkDown {

    // formatting
    BOF = spaces,
    EOF = spaces end,
    line = '\n' -> ("")
         | (~'\n' string)+:l '\n'? -> (l.join("")),
    lineSpaces = ' '*,

    // headers
    h1 = "#" lineSpaces line:h -> (tag("h1", h))
       | (~'\n' string)+:h '\n' '='+ lineSpaces ('\n' | end) -> (tag("h1", h.join(""))),
    h2 = "##" lineSpaces line:h -> (tag("h2", h))
       | (~'\n' string)+:h '\n' '-'+ lineSpaces ('\n' | end) -> (tag("h2", h.join(""))),
    h3 = "###" lineSpaces line:h -> (tag("h3", h)),

    // flourishes
    strong = "**" lineSpaces (~"**" char)*:t lineSpaces "**" -> (tag("strong", t.join(""))),
    em = "*" lineSpaces (~"*" char)*:t lineSpaces "*" -> (tag("em", t.join(""))),

    // text
    para = (strong | em | (~seq("\n") char))+:t '\n'? -> (tag("p", t.join(""))),
    break = '\n' -> (singleTag("br")),

    // code
    codeBlock = fromTo("```\n", "\n```"):t -> tag("pre",tag("code",esc(t))),

    // markdown
    markdownLine = (h3|h2|h1|codeBlock|para|break):t -> (t),
    markdown = BOF markdownLine*:m EOF -> (m.join("")),
    END

}

function singleTag (tag)  {
    return "<"+tag+" />"
}

function tag (tag, str) {
    return "<"+tag+">"+str+"</"+tag+">";
};

function esc (s) {
    return s.replace(/</g,"&lt").replace(/>/g,"&gt").replace(/\n/g,"<br/>");
};

var result = MarkDown.matchAll(
    text,
    'markdown'
);

console.log(result);

result.html

<h1>hi</h1><h3>hi hi</h3><h2>another</h2><br /><p>hello</p><br /><br /><p>    </p><br /><pre><code>```<br/>&ltcode&gt<br/>    hi<br/>&lt/code&gt<br/>```</code></pre><br />