Commit Graph

59 Commits

Author SHA1 Message Date
dmsnell
53fd556c73 HTML API: Fix splitting single text node.
When `next_token()` was introduced, it brought a subtle bug. When encountering a `<` in the HTML stream which did not lead to a tag or comment or other token, it was treating the full text span to that point as one text node, and the following span another text node.

The entire span should be one text node.

In this patch the Tag Processor properly detects this scenario and combines the spans into one text node.

Follow-up to [57348]

Props jonsurrell
Fixes #60385


Built from https://develop.svn.wordpress.org/trunk@57489


git-svn-id: http://core.svn.wordpress.org/trunk@56990 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-30 22:09:22 +00:00
dmsnell
62e0ef411b HTML API: Scan all syntax tokens in a document, read modifiable text.
Since its introduction in WordPress 6.2 the HTML Tag Processor has
provided a way to scan through all of the HTML tags in a document and
then read and modify their attributes. In order to reliably do this, it
also needed to be aware of other kinds of HTML syntax, but it didn't
expose those syntax tokens to consumers of the API.

In this patch the Tag Processor introduces a new scanning method and a
few helper methods to read information about or from each token. Most
significantly, this introduces the ability to read `#text` nodes in the
document.

What's new in the Tag Processor?
================================

 - `next_token()` visits every distinct syntax token in a document.
 - `get_token_type()` indicates what kind of token it is.
 - `get_token_name()` returns something akin to `DOMNode.nodeName`.
 - `get_modifiable_text()` returns the text associated with a token.
 - `get_comment_type()` indicates why a token represents an HTML comment.

Example usage.
==============

{{{
<?php
function strip_all_tags( $html ) {
        $text_content = '';
        $processor    = new WP_HTML_Tag_Processor( $html );

        while ( $processor->next_token() ) {
                if ( '#text' !== $processor->get_token_type() ) {
                        continue;
                }

                $text_content .= $processor->get_modifiable_text();
        }

        return $text_content;
}
}}}

What changes in the Tag Processor?
==================================

Previously, the Tag Processor would scan the opening and closing tag of
every HTML element separately. Now, however, there are special tags
which it only visits once, as if those elements were void tags without
a closer.

These are special tags because their content contains no other HTML or
markup, only non-HTML content.

 - SCRIPT elements contain raw text which is isolated from the rest of
   the HTML document and fed separately into a JavaScript engine. There
   are complicated rules to avoid escaping the script context in the HTML.
   The contents are left verbatim, and character references are not decoded.

 - TEXTARA and TITLE elements contain plain text which is decoded
   before display, e.g. transforming `&amp;` into `&`. Any markup which
   resembles tags is treated as verbatim text and not a tag.

 - IFRAME, NOEMBED, NOFRAMES, STYLE, and XMP elements are similar to the
   textarea and title elements, but no character references are decoded.
   For example, `&amp;` inside a STYLE element is passed to the CSS engine
   as the literal string `&amp;` and _not_ as `&`.

Because it's important not treat this inner content separately from the
elements containing it, the Tag Processor combines them when scanning
into a single match and makes their content available as modifiable
text (see below).

This means that the Tag Processor will no longer visit a closing tag for
any of these elements unless that tag is unexpected.

{{{
    <title>There is only a single token in this line</title>
    <title>There are two tokens in this line></title></title>
    </title><title>There are still two tokens in this line></title>
}}}

What are tokens?
================

The term "token" here is a parsing term, which means a primitive unit in
HTML. There are only a few kinds of tokens in HTML:

 - a tag has a name, attributes, and a closing or self-closing flag.
 - a text node, or `#text` node contains plain text which is displayed
   in a browser and which is decoded before display.
 - a DOCTYPE declaration indicates how to parse the document.
 - a comment is hidden from the display on a page but present in the HTML.

There are a few more kinds of tokens that the HTML Tag Processor will
recognize, some of which don't exist as concepts in HTML. These mostly
comprise XML syntax elements that aren't part of HTML (such as CDATA and
processing instructions) and invalid HTML syntax that transforms into
comments.

What is a funky comment?
========================

This patch treats a specific kind of invalid comment in a special way.
A closing tag with an invalid name is considered a "funky comment." In
the browser these become HTML comments just like any other, but their
syntax is convenient for representing a variety of bits of information
in a well-defined way and which cannot be nested or recursive, given
the parsing rules handling this invalid syntax.

 - `</1>`
 - `</%avatar_url>`
 - `</{"wp_bit": {"type": "post-author"}}>`
 - `</[post-author]>`
 - `</__( 'Save Post' );>`

All of these examples become HTML comments in the browser. The content
inside the funky content is easily parsable, whereby the only rule is
that it starts at the `<` and continues until the nearest `>`. There
can be no funky comment inside another, because that would imply having
a `>` inside of one, which would actually terminate the first one.

What is modifiable text?
========================

Modifiable text is similar to the `innerText` property of a DOM node.
It represents the span of text for a given token which may be modified
without changing the structure of the HTML document or the token.

There is currently no mechanism to change the modifiable text, but this
is planned to arrive in a later patch.

Tags
====

Most tags have no modifiable text because they have child nodes where
text nodes are found. Only the special tags mentioned above have
modifiable text.

{{{
    <div class="post">Another day in HTML</div>
    └─ tag ──────────┘└─ text node ─────┘└────┴─ tag
}}}

{{{
    <title>Is <img> &gt; <image>?</title>
    │      └ modifiable text ───┘       │ "Is <img> > <image>?"
    └─ tag ─────────────────────────────┘
}}}

Text nodes
==========

Text nodes are entirely modifiable text.

{{{
    This HTML document has no tags.
    └─ modifiable text ───────────┘
}}}

Comments
========

The modifiable text inside a comment is the portion of the comment that
doesn't form its syntax. This applies for a number of invalid comments.

{{{
    <!-- this is inside a comment -->
    │   └─ modifiable text ──────┘  │
    └─ comment token ───────────────┘
}}}

{{{
    <!-->
    This invalid comment has no modifiable text.
}}}

{{{
    <? this is an invalid comment -->
    │ └─ modifiable text ────────┘  │
    └─ comment token ───────────────┘
}}}

{{{
    <[CDATA[this is an invalid comment]]>
    │       └─ modifiable text ───────┘ │
    └─ comment token ───────────────────┘
}}}

Other token types also have modifiable text. Consult the code or tests
for further information.

Developed in https://github.com/WordPress/wordpress-develop/pull/5683
Discussed in https://core.trac.wordpress.org/ticket/60170

Follows [57575]

Props bernhard-reiter, dlh, dmsnell, jonsurrell, zieladam
Fixes #60170


Built from https://develop.svn.wordpress.org/trunk@57348


git-svn-id: http://core.svn.wordpress.org/trunk@56854 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-24 23:37:16 +00:00
dmsnell
7f22c4d4ea HTML API: Support INPUT tags.
Adds support for the following HTML elements to the HTML Processor:

 - INPUT

Previously this element was not supported and the HTML Processor would bail when encountering one. Now, with this patch applied, it will proceed to parse the HTML document.

Developed in https://github.com/WordPress/wordpress-develop/pull/5907
Discussed in https://core.trac.wordpress.org/ticket/60283

Props jonsurrell
See #60283


Built from https://develop.svn.wordpress.org/trunk@57343


git-svn-id: http://core.svn.wordpress.org/trunk@56849 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-24 03:30:14 +00:00
dmsnell
3efed38163 HTML API: Support PARAM, SOURCE, and TRACK tags.
Adds support for the following HTML elements to the HTML Processor:

 - PARAM, SOURCE, TRACK

Previously these elements were not supported and the HTML Processor would bail when encountering them. Now, with this patch applied, it will proceed to parse an HTML document when encountering those tags.

Props jonsurrell, dmsnell
Fixes #60283


Built from https://develop.svn.wordpress.org/trunk@57326


git-svn-id: http://core.svn.wordpress.org/trunk@56832 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-23 01:51:16 +00:00
dmsnell
1d4b95336a HTML API: Cleanup tests and list of void elements.
This patch adds newly supported elements to tests that should have been updated
in recent PRs, but which were merged without that. Those PRs removed failing
tests showing that the elements were unsupported, but did not add the elements
to the list of supported ones.

It also removes some elements from the special-exclusion list of unsupported IN
BODY elements. These did not present in failing tests because earlier
conditions in the switch structure caught the tags before hitting the default
block.

Finally it adds some missing elements to the list of void elements. These
elements are not listed as void in the HTML specification because they are
deprecated. However, they are treated as void for the sake of HTML
serialization and the parsing rules indicate that they behave as void elements,
so it's safe to list them within the HTML API as void.

Developed in WordPress/wordpress-develop#5913

Fixes #60307


Built from https://develop.svn.wordpress.org/trunk@57319


git-svn-id: http://core.svn.wordpress.org/trunk@56825 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-20 00:15:13 +00:00
dmsnell
cf88a3098c HTML API: Add support for PRE and LISTING elements.
Adds support for the following HTML elements to the HTML Processor:

 - PRE, LISTING

Previously, these elements were not supported and the HTML Processor would bail when encountering them. Now, with this patch applied, it will proceed to parse an HTML document when encountering those tags.

Developed in WordPress/wordpress-develop#5903

Props jonsurrell, dmsnell
Fixes #60283


Built from https://develop.svn.wordpress.org/trunk@57317


git-svn-id: http://core.svn.wordpress.org/trunk@56823 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-19 22:07:09 +00:00
dmsnell
050c342a46 HTML API: Add support for BR, EMBED, & other tags.
Adds support for the following HTML elements to the HTML Processor:

 - AREA, BR, EMBED, KEYGEN, WBR
 - Only the opening BR tag is supported, as the invalid closer `</br>`
   involves more complicated rules, to be implemented later.

Previously, these elements were not supported and the HTML Processor
would bail when encountering them. With this patch it will proceed to
parse an HTML document when encountering those tags as long as other
normal conditions don't cause it to bail (such as complicated format
reconstruction rules).

Props jonsurrell, dmsnell
Fixes #60283


Built from https://develop.svn.wordpress.org/trunk@57316


git-svn-id: http://core.svn.wordpress.org/trunk@56822 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-19 21:41:12 +00:00
dmsnell
141ba4ff59 HTML API: Add support for HR element.
Adds support for the following HTML elements to the HTML Processor:

 - HR

Previously, this element was not supported and the HTML Processor would bail when encountering
it. Now, with this patch, it will proceed to parse an HTML document when encountering one.

Developed in WordPress/wordpress-develop#5897

Props jonsurrell, dmsnell
Fixes #60283


Built from https://develop.svn.wordpress.org/trunk@57314


git-svn-id: http://core.svn.wordpress.org/trunk@56820 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-19 19:03:09 +00:00
dmsnell
29dd837333 HTML API: Add support for list elements.
Adds support for the following HTML elements to the HTML Processor:

 - LI, OL, UL.
 - DD, DL, DT.

Previously, these elements were not supported and the HTML Processor would bail when encountering them.
With this patch it will proceed to parse an HTML document when encountering those tags as long as other normal conditions don't cause it to bail (such as complicated format reconstruction).

Props audrasjb, jonsurrell, bernhard-reiter.
Fixes #60215.


Built from https://develop.svn.wordpress.org/trunk@57264


git-svn-id: http://core.svn.wordpress.org/trunk@56770 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-10 14:05:17 +00:00
Bernhard Reiter
372e3c4b97 HTML API: Add explicit handling or failure for all tags.
The HTML API HTML processor does not yet support all tags. Many tags (e.g. list elements) have some complicated rules in the [https://html.spec.whatwg.org/#parsing-main-inbody "in body" insertion mode].

Implementing these special rules is blocking the implementation for a catch-all rule for "any other tag" because we need to prevent special rules from being handled by the catch-all.

  Any other start tag
  Reconstruct the active formatting elements, if any.

  Insert an HTML element for the token.

  …

This change ensures the HTML Processor fails when handling special tags. This is the same as existing behavior, but will allow us to implement the catch-all "any other tag" handling without unintentionally handling special elements.

Additionally, we add tests that assert the special elements are unhandled. As these tags are implemented, this should help to ensure they're removed from the unsupported tag list.

Props jonsurrell, dmsnell.
Fixes #60092.
Built from https://develop.svn.wordpress.org/trunk@57248


git-svn-id: http://core.svn.wordpress.org/trunk@56754 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2024-01-08 14:05:24 +00:00
Sergey Biryukov
13f7ee3063 Coding Standards: Correct alignment in WP_HTML_Tag_Processor::apply_attributes_updates().
This fixes an `Equals sign not aligned correctly` WPCS warning.

Follow-up to [57179].

Props antonvlasenko, dmsnell, ironprogrammer.
Fixes #60078.
Built from https://develop.svn.wordpress.org/trunk@57227


git-svn-id: http://core.svn.wordpress.org/trunk@56733 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-12-25 14:03:19 +00:00
Bernhard Reiter
8e5db640de HTML API: Avoid processing incomplete tokens.
Currently the Tag Processor assumes that an input document is a ''full'' HTML document. Because of this, if there's lingering content after the last tag match it will treat that content as plaintext and skip over it. This is fine for the Tag Processor because if there is lingering content that isn't a valid tag then there's nothing for `next_tag()` to match.

However, in order to support a number of feature expansions it is important to recognize that the remaining content ''may'' involve partial syntax elements, such as incomplete tags, attributes, or comments.

In this patch we're adding a mode inside the Tag Processor which will flip when we start parsing HTML syntax but the document finishes before the token does. This will provide the ability to:

- extend the input document,
- avoid misinterpreting syntax as text, and
- guess if we have a complete document, know if we have an incomplete document.

In the process of building this patch a few fixes were identified and fixed in the Tag Processor, namely in the handling of incomplete syntax elements.

Props dmsnell, jonsurrell.
Fixes #60122, #60108.
Built from https://develop.svn.wordpress.org/trunk@57211


git-svn-id: http://core.svn.wordpress.org/trunk@56717 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-12-20 17:52:30 +00:00
Bernhard Reiter
a586b85d8e HTML API: Apply linting changes to @TODO comments.
Lowercase `@TODO` comments introduced by [57186], and remove spurious colons after them.

Props dmsnell, TobiasBg, mukesh27, sergeybiryukov, jonsurrell.
Fixes #60060.
Built from https://develop.svn.wordpress.org/trunk@57209


git-svn-id: http://core.svn.wordpress.org/trunk@56715 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-12-20 12:36:31 +00:00
Bernhard Reiter
511dcb7520 HTML API: Add support for H1-H6 elements in the HTML Processor.
Previously these have been unsupported, but in this patch, support is added for the tags so that the HTML Processor can process documents containing them.

There was a design discussion about introducing a constant to communicate "any of the H1 - H6 elements" but this posed a number of challenges that don't need to be answered in this patch. For the time being, because the HTML specification treats H1 - H6 specially as a single kind of element, the HTML Processor uses an internal hard-coded string to indicate this. By using a hard-coded string it's possible to avoid introducing a class constant which cannot be made private due to PHP's class design. In the future, this will probably appear as a special constant in a new constant-containing class.

Props dmsnell, jonsurrell.
Fixes #60060.
Built from https://develop.svn.wordpress.org/trunk@57186


git-svn-id: http://core.svn.wordpress.org/trunk@56697 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-12-13 17:53:19 +00:00
zieladam
760fae6c43 HTML API: Track spans of text with (offset, length) instead of (start, end).
Updates the internal representation of the text span coordinates. The mixture of (offset, length) and (start, end) coordinates becomes confusing, this commit replaces it with a (offset, length) pair. There should be no functional or behavioral changes in this patch. For the internal helper classes this patch introduces breaking changes, but those classes are marked private and should not be used outside of the HTML API itself.

Props dmsnell.
Fixes #59993.


Built from https://develop.svn.wordpress.org/trunk@57179


git-svn-id: http://core.svn.wordpress.org/trunk@56690 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-12-10 13:19:28 +00:00
Joe McGill
46406afcc4 HTML-API: Prevent unintended behavior when WP_HTML_Token is unserialized.
Props dmsnell, peterwilsoncc, dd32, xknown, rawrly, johnbillion, barry, jeffpaul, vortfu, isabel_brison, mikeschroder, jorbin.

Built from https://develop.svn.wordpress.org/trunk@57163


git-svn-id: http://core.svn.wordpress.org/trunk@56674 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-12-06 16:05:19 +00:00
Bernhard Reiter
b5ac702f60 HTML API: Fix typo in documentation example.
The example code in the PHPDoc comment for the HTML Tag Processor class
previously showed calling `next_tag()` with an array containing a `class`
key, which should have been `class_name`. This patch fixes this by using
the appropriate `class_name` key.

Props dmsnell, gaambo, crstauf, atachibana, audrasjb, krupalpanchal.
Fixes #59891.
Built from https://develop.svn.wordpress.org/trunk@57116


git-svn-id: http://core.svn.wordpress.org/trunk@56627 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-11-17 06:40:24 +00:00
Bernhard Reiter
b86334b447 HTML API: Add support for containers elements, including ARTICLE.
There are a handful of elements which behave similarly and are generically container elements. These are the following elements:

    ADDRESS, ARTICLE, ASIDE, BLOCKQUOTE, CENTER, DETAILS, DIALOG, DIR,
    DL, DIV, FIELDSET, FIGCAPTION, FIGURE, FOOTER, HEADER, HGROUP, MAIN,
    MENU, NAV, SEARCH, SECTION, SUMMARY

This patch adds support to the HTML Processor for handling these elements. They do not require any additional logic in the rest of the class, and carry no specific semantic rules for parsing beyond what is listed in their group in the IN BODY section of the HTML5 specification.

Props dmsnell.
Fixes #59914.
Built from https://develop.svn.wordpress.org/trunk@57115


git-svn-id: http://core.svn.wordpress.org/trunk@56626 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-11-17 06:13:25 +00:00
Sergey Biryukov
7da5644617 Docs: Use proper case for @todo tags.
The correct tag is `@todo`, not `@TODO` or `@todo:` (note the trailing colon).

Reference: [https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/#phpdoc-tags PHP Documentation Standards: PHPDoc tags].

Follow-up to [55203], [56274], [56565], [56698].

Props jrf.
See #59651.
Built from https://develop.svn.wordpress.org/trunk@57077


git-svn-id: http://core.svn.wordpress.org/trunk@56588 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-11-07 00:14:23 +00:00
Sergey Biryukov
fe3efe9810 HTML API: Scan to end of tag when getting updated HTML output.
When applying updates to HTML, one step was left out in [56941] which updated the position of the end of the current tag. This made it possible to create bookmarks with null or earlier end positions than their start position. This in turn broke the Directive Processor in Gutenberg during the backport of changes from Core into Gutenberg.

In this commit, after applying updates, the HTML document is now scanned fully to the end of the current tag, updating the internal pointer to its end, so that nothing else will be broken or misaligned.

Follow-up to [56941].

Props dmsnell.
Fixes #59643.
Built from https://develop.svn.wordpress.org/trunk@56953


git-svn-id: http://core.svn.wordpress.org/trunk@56464 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-10-17 10:39:27 +00:00
Sergey Biryukov
89a5bbb997 HTML API: Avoid calling subclass method while internally scanning in Tag Processor.
After modifying tags in the HTML API, the Tag Processor backs up to before the tag being modified and then re-parses its attributes. This saves on the code complexity involved in applying updates, which have already been transformed to “lexical updates” by the time they are applied.

In order to do that, `::get_updated_html()` called `::next_tag()` to reuse its logic. However, as a public method, subclasses may change the behavior of that method, and the HTML Processor does just this. It maintains an HTML stack of open elements and when the Tag Processor calls this method to re-scan a tag and its attributes, it leads to a broken stack.

This commit replaces the call to `::next_tag()` with a more appropriate reapplication of its internal parsing logic to rescan the tag name and its attributes. Given the limited nature of what's occurring in `::get_updated_html()`, this should bring with it certain guarantees that no HTML structure is being changed (that structure will only be changed by subclasses like the HTML Processor).

Follow-up to [56274], [56702].

Props dmsnell, zieladam, nicolefurlan.
Fixes #59607.
Built from https://develop.svn.wordpress.org/trunk@56941


git-svn-id: http://core.svn.wordpress.org/trunk@56452 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-10-16 14:01:27 +00:00
Sergey Biryukov
4fd39c6620 HTML API: Rename WP_HTML_Processor::createFragment() to follow WPCS.
`WP_HTML_Processor::create_fragment()` is the correct method name as per the WordPress PHP coding standards.

Follow-up to [56274].

Props dmsnell, jrf, hellofromTonya, SergeyBiryukov.
Fixes #59547.
Built from https://develop.svn.wordpress.org/trunk@56790


git-svn-id: http://core.svn.wordpress.org/trunk@56302 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-10-05 22:42:26 +00:00
Sergey Biryukov
ffd72aac28 Coding Standards: Remove redundant ignore annotations, take 5.
The `VariableAnalysis` standard is not used by WP Core.

Follow-up to [50958], [51003], [52049], [52051], [52069], [53072], [54132], [55132], [56363], [56738], [56743], [56751], [56752].

Props jrf.
See #59161.
Built from https://develop.svn.wordpress.org/trunk@56753


git-svn-id: http://core.svn.wordpress.org/trunk@56265 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-10-02 11:27:24 +00:00
Bernhard Reiter
2d9b5cb098 HTML API: Add class name utilities has_class() and class_list().
This patch adds two new public methods to the HTML Tag Processor:
 - `has_class()` indicates if a matched tag contains a given CSS class name.
 - `class_list()` returns a generator to iterate over all the class names in a matched tag.

Included in this patch is a refactoring of the internal logic when matching
a tag to reuse the new `has_class()` function. Previously it was relying on
optimized code in the `matches()` function which performed byte-for-byte
class name comparison. With the change in this patch it will perform class
name matching on the decoded value, which might differ if a class attribute
contains character references.

These methods may be useful for running more complicated queries based
on the presence or absence of CSS class names. The use of these methods
avoids the need to manually decode the class attribute as reported by
`$process->get_attribute( 'class' )`.

Props dmsnell.
Fixes #59209.
Built from https://develop.svn.wordpress.org/trunk@56703


git-svn-id: http://core.svn.wordpress.org/trunk@56215 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-09-26 09:17:18 +00:00
Bernhard Reiter
374bcd9b3d HTML API: Add matches_breadcrumbs() method for better querying.
Inside a `next_tag()` loop it can be challenging to use breadcrumbs because they are only exposed inside the call to `next_tag()` via the `$query` arg.

In this patch a new method, `matches_breadcrumbs()`, is exposed which allows for querying within the `next_tag()` loop for more complicated queries.

This method exposes a wildcard `*` operator to allow matching ''any HTML tag'' that the currently-matched tag is a child or descendant of.

Props dmsnell, westonruter, mukesh27.
Fixes #59400.
Built from https://develop.svn.wordpress.org/trunk@56702


git-svn-id: http://core.svn.wordpress.org/trunk@56214 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-09-26 08:20:17 +00:00
Bernhard Reiter
061c32d574 HTML API: Remove all duplicate copies of an attribute when removing.
When encountering an HTML tag with duplicate copies of an attribute the tag processor ignores the duplicate values, according to the specification. However, when removing an attribute it must remove all copies of that attribute lest one of the duplicates becomes the primary and it appears as if no attributes were removed.

In this patch we're adding tests that will be used to ensure that all attribute copies are removed from a tag when one is request to be removed.

**Before**

{{{#!php
<?php
$p = new WP_HTML_Tag_Processor( '<br id=one id="two" id='three' id>' );
$p->next_tag();
$p->remove_attribute( 'id' );
$p->get_updated_html();
// <br id="two" id='three' id>
}}}

**After**

{{{#!php
<?php
$p = new WP_HTML_Tag_Processor( '<br id=one id="two" id='three' id>' );
$p->next_tag();
$p->remove_attribute( 'id' );
$p->get_updated_html();
// <br>
}}}

Previously we have been overlooking duplicate attributes since they don't have an impact on what parses into the DOM. However, as one unit test affirmed (asserting the presence of the bug in the tag processor) when removing an attribute where duplicates exist this meant we ended up changing the value of an attribute instead of removing it.

In this patch we're tracking the text spans of the parsed duplicate attributes so that ''if'' we attempt to remove them then we'll have the appropriate information necessary to do so. When an attribute isn't removed we'll simply forget about the tracked duplicates. This involves some overhead for normal operation ''when'' in fact there are duplicate attributes on a tag, but that overhead is minimal in the form of integer pairs of indices for each duplicated attribute.

Props dmsnell, zieladam.
Fixes #58119.
Built from https://develop.svn.wordpress.org/trunk@56684


git-svn-id: http://core.svn.wordpress.org/trunk@56196 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-09-25 19:04:19 +00:00
Bernhard Reiter
15c3f036fd HTML API: Update documentation and rename internal variable on HTML Processor
This patch updates documentation and an internal variable name within the
HTML Processor class so that they are more helpful and complete to a reader.

There should be no functional or visual changes in this patch.

Props dmsnell, mukesh27.
Fixes #59267.
Built from https://develop.svn.wordpress.org/trunk@56565


git-svn-id: http://core.svn.wordpress.org/trunk@56077 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-09-13 13:02:17 +00:00
Bernhard Reiter
deaa431a90 HTML API: Skip over contents of RAWTEXT elements such as STYLE.
When encountering elements that imply switching into the RAWTEXT parsing state,
the Tag Processor should skip processing until exiting the RAWTEXT state.

In this patch the Tag Processor does just that, except for the case of the
deprecated XMP element which implies further and more complicated rules.

There's an implicit assumption that the SCRIPT ENABLED flag in HTML parsing
is enabled so that the contents of NOSCRIPT can be skipped. Otherwise, it would
be required to parse the contents of that tag.

Props dmsnell.
Fixes #59292.
Built from https://develop.svn.wordpress.org/trunk@56563


git-svn-id: http://core.svn.wordpress.org/trunk@56075 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-09-13 12:49:16 +00:00
Bernhard Reiter
251a9c7653 HTML API: Store current token reference in HTML Processor state.
The `$current_token` reference has been stored in the HTML Processor itself, but I suggested to move it into the externalized state so that it can be stored and replaced.

In this patch the reference is moved to that state variable and it should become more possible to save and load state, to resume execution after pausing.

Props dmsnell.
Fixes #59268.
Built from https://develop.svn.wordpress.org/trunk@56558


git-svn-id: http://core.svn.wordpress.org/trunk@56070 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-09-12 15:12:17 +00:00
Sergey Biryukov
b80ce60f70 Coding Standards: Use pre-increment/decrement for stand-alone statements.
Note: This is enforced by WPCS 3.0.0:

1. There should be no space between an increment/decrement operator and the variable it applies to.
2. Pre-increment/decrement should be favoured over post-increment/decrement for stand-alone statements. “Pre” will in/decrement and then return, “post” will return and then in/decrement. Using the “pre” version is slightly more performant and can prevent future bugs when code gets moved around.

References:
* [https://developer.wordpress.org/coding-standards/wordpress-coding-standards/php/#increment-decrement-operators WordPress PHP Coding Standards: Increment/decrement operators]
* [https://github.com/WordPress/WordPress-Coding-Standards/pull/2130 WPCS: PR #2130 Core: add sniffs to check formatting of increment/decrement operators]

Props jrf.
See #59161, #58831.
Built from https://develop.svn.wordpress.org/trunk@56549


git-svn-id: http://core.svn.wordpress.org/trunk@56061 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-09-09 09:28:26 +00:00
Bernhard Reiter
c67fe4b6e5 HTML API: Stop processing HTML when encountering unsupported markup.
It was a design goal of the HTML Processor to abort processing its input document when encountering unsupported markup. Unfortunately there was no test for this and so-far, the HTML Processor has paused, but continued processing in these situations.

In this patch a new test ensures that the HTML Processor stops and refuses to move forward after encountering any unsupported markup. It also ensures that it doesn't report any current tag names since unsupported markup could imply that the read tag name is different than the parsed tag name.

Props dmsnell.
Fixes #59167.
Built from https://develop.svn.wordpress.org/trunk@56493


git-svn-id: http://core.svn.wordpress.org/trunk@56005 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-08-30 15:39:16 +00:00
Bernhard Reiter
12884f0361 HTML API: Add support for BUTTON element.
This patch adds support to process the BUTTON element. This requires adding some additional semantic rules to handle situations where a BUTTON element is already in scope.

Also included is a fixup to enforce that `WP_HTML_Processor::next_tag()` never returns for a tag closer. This is useful with the Tag Processor, but not for the HTML Processor. There were tests relying on this behavior to assert that internal processes were working as they should, but those tests have been updated to use the semi-private `step()` function, which does stop on tag closers.

This patch is one in a series of changes to expand support within the HTML API, moving gradually to allow for more focused changes that are easier to review and test. The HTML Processor is a work in progress with a certain set of features slated to be ready and tested by 6.4.0, but it will only contain partial support of the HTML5 specification even after that. Whenever it cannot positively recognize and process its input it bails, and certain function stubs and logical stubs exist to structure future expansions of support.

Props dmsnell.
Fixes #58961.
Built from https://develop.svn.wordpress.org/trunk@56380


git-svn-id: http://core.svn.wordpress.org/trunk@55892 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-08-10 08:37:20 +00:00
Aaron Jorbin
5341f9b212 HTML API: Fix missing * for docblock.
Follow up to [56363].

Props dmsnell.
See #58918. Fixes #59010.

Built from https://develop.svn.wordpress.org/trunk@56376


git-svn-id: http://core.svn.wordpress.org/trunk@55888 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-08-08 23:01:26 +00:00
Bernhard Reiter
fa83c8e1cd HTML API: Adjust code styling to Gutenberg's linter's preferences.
Adjust the code style according to the rules that the linting process in Gutenberg requires.

There are only a couple code changes that should have no effect on the runtime:
 - A missing check to verify that only `UTF-8` is supported has been added (brought up because it was identified as an undefined variable).
 - A few `return false;` statements have been added to avoid having the linter complain that functions don't return a value despite indicating they return `bool`. The functions are stubs for coming support and currently `throw`, so the `return` statements are unreachable.

Props dmsnell, costdev, davidbaumwald, peterwilsoncc, SergeyBiryukov.
Fixes #58918.
Built from https://develop.svn.wordpress.org/trunk@56363


git-svn-id: http://core.svn.wordpress.org/trunk@55875 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-08-07 13:50:27 +00:00
Bernhard Reiter
8fa9aad5e6 HTML API: Add support for SPAN element.
In this patch we're introducing support for the SPAN element, which is the first
in the class of "any other tag" in the "in body" insertion mode.

This patch introduces the mechanisms required to handle that class of tags but
only introduces SPAN to keep the change focused. With the tests and mechanisms
in place it will be possible to follow-up and add another limited set of tags.

It's important that this not use the default catch-all in the switch handling
`step_in_body` because that would catch tags that have specific rules in previous
case statements that aren't yet added. For example, we don't want to treat the
`TABLE` element as "any other tag".

Props dmsnell.
Fixes #58907.
Built from https://develop.svn.wordpress.org/trunk@56331


git-svn-id: http://core.svn.wordpress.org/trunk@55843 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-08-01 07:56:23 +00:00
Sergey Biryukov
80e5ebb0cc Coding Standards: Always declare visibility for class methods.
This adds a missing `public` keyword for `WP_HTML_Tag_Processor::get_attribute_names_with_prefix()`.

Follow-up to [55203].

Props jrf.
See #58831.
Built from https://develop.svn.wordpress.org/trunk@56301


git-svn-id: http://core.svn.wordpress.org/trunk@55813 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-07-25 13:16:21 +00:00
Bernhard Reiter
44629e6286 HTML-API: Introduce minimal HTML Processor.
This patch introduces the //first// of //many// iterations on the evolution of the HTML API, the HTML Processor, which is built in order to understand HTML structure including nesting, misnesting, and complicated semantic rules.

In the first iteration, the HTML Processor is arbitrarily limited to a minimal subset of functionality so that we can review it, ship it, test it, and collect feedback before moving forward. This means that this patch is more or less an extension to the Tag Processor query language, providing the ability not only to scan for a tag of a given name, but also to find an HTML element in a specific nesting path.

The HTML Processor also aborts any time it encounters:
 - a tag that isn't a `P`, `DIV`, `FIGURE`, `FIGCAPTION`, `IMG`, `STRONG`, `B`, `EM`, `I`, `A`, `BIG`, `CODE`, `FONT`, `SMALL`, `STRIKE`, `TT`, or `U` tag. this limit exists because many HTML elements require specific rules and we are trying to limit the number of rules introduced at once. this work is targeted at existing work in places like the image block.
 - certain misnesting constructs that evoke complicated resolution inside the HTML spec. where possible and where simple to do reliably, certain parse errors are handled. in most cases the HTML Processor aborts.

The structure of the HTML Processor is established in this patch. Further spec-compliance comes through filling out //more of the same// kind and nature of code as is found in this patch. Certain critical HTML algorithms are partially supported, and where support requires more than is present, the HTML Processor acknowledges this and refuses to operate.

In this patch are explorations for how to verify that new HTML support is fully added (instead of allowing for partial updates that leave some code paths non-compliant). Performance is hard to measure since support is so limited at the current time, but it should generally follow the performance of the Tag Processor somewhat close as the overhead is minimized as much as practical.

Props dmsnell, zieladam, costdev.
Fixes #58517.
Built from https://develop.svn.wordpress.org/trunk@56274


git-svn-id: http://core.svn.wordpress.org/trunk@55786 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-07-20 13:43:25 +00:00
Andrew Ozz
817c701f29 HTML API: Fix a fatal error when processing malformed document with unclosed attribute.
Props: dlh, costdev, dmsnell.
Fixes: #58637.
Built from https://develop.svn.wordpress.org/trunk@56133


git-svn-id: http://core.svn.wordpress.org/trunk@55645 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-07-04 20:45:23 +00:00
Sergey Biryukov
5e0592d8f4 Docs: Improve HTML API file and class headers per the documentation standards.
Follow-up to [55203], [55304], [55718], [55724], [55727].

See #57840.
Built from https://develop.svn.wordpress.org/trunk@55734


git-svn-id: http://core.svn.wordpress.org/trunk@55246 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-09 11:19:21 +00:00
Sergey Biryukov
2ffb7ef083 Docs: Update code examples formatting in WP_HTML_Tag_Processor documentation.
Per the [https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/#description documentation standards], code samples should be created by indenting every line of the code by 4 spaces, with a blank line before and after. This matches the format used by the rest of core.

Follow-up to [55203], [55304], [55718], [55724].

Props juanmaguitar, coffee2code, azaozz, costdev, dmsnell, johnbillion, SergeyBiryukov.
Fixes #58028.
Built from https://develop.svn.wordpress.org/trunk@55727


git-svn-id: http://core.svn.wordpress.org/trunk@55239 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-08 17:32:24 +00:00
Sergey Biryukov
8b53b81183 Docs: Remove @return void from various DocBlocks.
Per the documentation standards, it should not be used outside of the default bundled themes.

Follow-up to [52049], [52051], [53331], [54156], [54214], [55203], [55719].

See #57840.
Built from https://develop.svn.wordpress.org/trunk@55725


git-svn-id: http://core.svn.wordpress.org/trunk@55237 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-06 11:40:24 +00:00
Sergey Biryukov
24eb807cbd Docs: Correct the placement of @see tags in WP_HTML_Tag_Processor class.
This moves a reference link in `::get_attribute_names_with_prefix()` below the code example, so that it is correctly displayed in the Developer Resources.

Includes updating some other `@see` tags for consistency as per the documentation standards.

Additionally, the example code for `WP_HTML_Tag_Processor::get_tag()` is updated to show lowercase tag names in the input HTML, so that it does not convey the wrong impression that the uppercase output from `::get_tag()` depends on the case of the input HTML.

Follow-up to [55203].

Props dmsnell, johnbillion, audrasjb, SergeyBiryukov.
Fixes #58254.
Built from https://develop.svn.wordpress.org/trunk@55724


git-svn-id: http://core.svn.wordpress.org/trunk@55236 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-05 12:43:21 +00:00
audrasjb
3911398ec5 HTML API: Restore mistakenly-removed content in documentation.
In [55718] the Unicode replacement character was mistakenly removed. The purpose of including the character was to communicate what it looks like and why the Tag Processor won't insert it into the document.

This changeset brings the character back and adds a small clue to fix the confusion that may lead to its removal.

Follow-up to [55718].

Props dmsnell.
Fixes #58256
See #57840.

Built from https://develop.svn.wordpress.org/trunk@55723


git-svn-id: http://core.svn.wordpress.org/trunk@55235 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-05 10:58:23 +00:00
Bernhard Reiter
f2d315036b HTML API: Adjust coding style to pass Gutenberg linter.
This patch adjusts some minor neutral whitespace that the Gutenberg linting rejects.
There are no code changes otherwise.

Props dmsnell.
Fixes #58250.
Built from https://develop.svn.wordpress.org/trunk@55721


git-svn-id: http://core.svn.wordpress.org/trunk@55233 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-04 08:42:22 +00:00
John Blackbourn
89cbdce5c3 Docs: Improve formatting of markup in the docs for WP_HTML_Tag_Processor.
Code blocks wrapped inside backtacks don't need to be indented.

See #57840

Built from https://develop.svn.wordpress.org/trunk@55718


git-svn-id: http://core.svn.wordpress.org/trunk@55230 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-03 23:55:16 +00:00
Bernhard Reiter
5a32396d8f HTML API: Accumulate shift for internal parsing pointer.
A bug was discovered where where the parser wasn't returning to the
start of the affected tag after making some updates.

In few words, the Tag Processor has not been treating its own internal
pointer `bytes_already_parsed` the same way it treats its bookmarks.
That is, when updates are applied to the input document and then
`get_updated_html()` is called, the internal pointer transfers to
the newly-updated content as if no updates had been applied since
the previous call to `get_updated_html()`.

In this patch we're creating a new "shift accumulator" to account for
all of the updates that accrue before calling `get_updated_html()`.
This accumulated shift will be applied when swapping the input document
with the output buffer, which should result in the pointer pointing to
the same logical spot in the document it did before the udpate.

In effect this patch adds a single workaround for treating the
internal pointer like a bookmark, plus a temporary pointer which points
to the beginning of the current tag when calling `get_updated_html()`.
This will preserve the assumption that updating a document doesn't
move that pointer, or shift which tag is currently matched.

Props dmsnell, zieladam.
Fixes #58179.
Built from https://develop.svn.wordpress.org/trunk@55706


git-svn-id: http://core.svn.wordpress.org/trunk@55218 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-05-03 11:31:18 +00:00
zieladam
8659101491 HTML API: Fix a case where updates are overlooked when seeking to earlier locations.
This retains the WP_HTML_Tag_Processor attribute updates applied before calling seek() – they were erroneously erased in some cases.

Props dmsnell.
Fixes #58160.




Built from https://develop.svn.wordpress.org/trunk@55675


git-svn-id: http://core.svn.wordpress.org/trunk@55187 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-04-21 13:32:25 +00:00
zieladam
1919350606 HTML API: Update code style so it passes when backported into Gutenberg.
This changes the indentation of a variable in class-wp-html-tag-processor.php 
to satisfy both WordPress and Gutenberg linters.

Props dmsnell, ntsekouras.
Fixes #58170.


Built from https://develop.svn.wordpress.org/trunk@55674


git-svn-id: http://core.svn.wordpress.org/trunk@55186 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-04-21 12:33:23 +00:00
Bernhard Reiter
b116fcdb27 HTML API: Add support for a few invalid HTML comment forms.
- Comments created by means of a tag closer with an invalid tag name, e.g. `</3>`.
 - Comments closed with the invalid `--!>` closer. (Comments should be closed by `-->` but if the `!` appears it will also close it, in error.)
 - Empty tag name elements, which are technically skipped over and aren't comments, e.g. `</>`.

Props dmsnell, costdev.
Fixes #58007.
Built from https://develop.svn.wordpress.org/trunk@55667


git-svn-id: http://core.svn.wordpress.org/trunk@55179 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-04-20 17:10:20 +00:00
Bernhard Reiter
3b58785908 HTML API: Ensure attribute updates happen only once for case variants.
When setting a new value for an attribute multiple times and providing
multiple case variations of the attribute name the Tag Processor has
been appending multiple copies of the attribute into the updated HTML.

This means that only the first attribute set determines the value in
the final output, plus the output will //appear// wrong.

In this patch we're adding a test to catch the situation and resolving it
by using the appropriate comparable attribute name as a key for storing
the updates as we go. Previously we stored updates to the attribute by
its given `$name`, but when a new update of the same name with a
case variant was queued, it would not override the previously-enqueued
value as it out to have.

Props dmsnell, zieladam.
Fixes #58146.
Built from https://develop.svn.wordpress.org/trunk@55659


git-svn-id: http://core.svn.wordpress.org/trunk@55171 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-04-19 09:27:22 +00:00