unclosed-tag-finder

v0.0.18

Published

2 months ago

A library to find unclosed html5 tags, that are normally optional.

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ixnode

unclosed tag finder w3c html tag analysis

Unclosed Tag Finder

A library that finds unclosed html5 tags that are normally optional (via W3C check). These optional tags could be:

html
head
body
p
dt
dd
li
option
thead
th
tbody
tr
td
tfoot
colgroup

Installation

user$ npm install unclosed-tag-finder -g

Usage (the command line version)

Create a valid html5 file (but with some unclosed tags)

user$ vi valid-utf8-unclosed.html

<!DOCTYPE html>
<html>
    <head>
        <title>Das sind Umlaute: öäü</title>
    </head>
    <body>
        <p  
            class="test"
        >Das ist ein Test.<br />                                                                                                                                                                          
        <p>äöü
        <ul>
            <li>123
        </ul>
    </body>
</html>

Check the html5 file with a w3c checker of your choice

user$ npm install html-validator-cli -g
user$ html-validator --file=valid-utf8-unclosed.html
Page is valid

user$ xmllint --html --noout valid-utf8-unclosed.html

The page is valid.

Find unclosed tags within this valid html5 file

user$ unclosed-tag-finder valid-utf8-unclosed.html                                                                 
valid-utf8-unclosed.html:7 (missing close tag: <p/>)
opening tag: <p
            class="test"
        >

valid-utf8-unclosed.html:10 (missing close tag: <p/>)
opening tag: <p>

valid-utf8-unclosed.html:12 (missing close tag: <li/>)
opening tag: <li>

Although the html file is valid, we found some unclosed html5 tags.

Use this library inside your own scripts

#!/usr/bin/env node

/* load some libraries */
var unclosedTagFinder = require('unclosed-tag-finder');
var fs = require('fs');

var finder = new unclosedTagFinder.builder();

/* check command line arguments */
if (process.argv.length < 3) {
    console.error('No file to validate was given. Abort..');
    process.exit(1);
}

/* read given file */
fs.readFile(process.argv[2], 'utf-8', function(err, html) {                                                                                                                                               
    if (err) {
        console.log(err);
        process.exit(1);
        return;
    }   

    var unclosedTags = finder.getUnclosedTags(html, process.argv[2]);

    if (unclosedTags.length == 0) {
        return;
    }   

    /* prints out missing close tag issues */
    for (var i = 0; i < unclosedTags.length; i++) {
        if (unclosedTags[i].hasNoCloseTag) {
            console.info(unclosedTags[i].filename + ':' + unclosedTags[i].line + ' (missing close tag: <' + unclosedTags[i].name + '/>)');
            console.info(unclosedTags[i].tag);
            console.info('');
        }
    }

    /* prints out missing open tag issues */
    for (var i = 0; i < unclosedTags.length; i++) {
        if (unclosedTags[i].hasNoOpenTag) {
            console.info(unclosedTags[i].filename + ':' + unclosedTags[i].line + ' (missing open tag: <' + unclosedTags[i].name + '>)');
            console.info(unclosedTags[i].tag);
            console.info('');
        }
    }
});

user$ chmod 775 listUnclosedTags.js

Now check the file with the listUnclosedTags.js script:

user$ ./listUnclosedTags.js valid-utf8-unclosed.html
valid-utf8-unclosed.html:7 (missing close tag: <p/>)
opening tag: <p
            class="test"
        >

valid-utf8-unclosed.html:10 (missing close tag: <p/>)
opening tag: <p>

valid-utf8-unclosed.html:12 (missing close tag: <li/>)
opening tag: <li>

More informations and source code

You will find more informations and the source code at GitHub.

For an executable npm package please have a look at npmjs.com.

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