PHP SmartyPants

PHP SmartyPants Lib 1.8.1 – 12 Dec 2016
by Michel Fortin
https://michelf.ca/
Original SmartyPants by John Gruber
https://daringfireball.net/

Introduction

This is a library package that includes the PHP SmartyPants and its
sibling PHP SmartyPants Typographer with additional features.
SmartyPants is a free web typography prettifyier tool for web writers. It
easily translates plain ASCII punctuation characters into “smart” typographic
punctuation HTML entities.
PHP SmartyPants is a port to PHP of the original SmartyPants written
in Perl by John Gruber.
SmartyPants can perform the following transformations:

Straight quotes (" and ') into “curly” quote HTML entities
Backtick-style quotes (``like this'') into “curly” quote HTML
entities
Dashes (-- and ---) into en- and em-dash entities
Three consecutive dots (...) into an ellipsis entity

SmartyPants Typographer can perform additional transformations:

French guillemets done using (<< and >>) into true « guillemets »
HTML entities.
Comma-style quotes (,,like this`` or ''like this,,) into their
curly equivalent.
Replace existing spaces with non-break spaces around punctuation marks
where appropriate, can also add or remove them if configured to.
Replace existing spaces with non-break spaces for spaces used as
a thousand separator and between a number and the unit symbol that
follows it (for most common units).

This means you can write, edit, and save using plain old ASCII straight
quotes, plain dashes, and plain dots, but your published posts (and
final HTML output) will appear with smart quotes, em-dashes, proper
ellipses, and proper no-break spaces (with Typographer).
SmartyPants does not modify characters within <pre>, <code>,
<kbd>, or <script> tag blocks. Typically, these tags are used to
display text where smart quotes and other “smart punctuation” would not
be appropriate, such as source code or example markup.

Backslash Escapes

If you need to use literal straight quotes (or plain hyphens and
periods), SmartyPants accepts the following backslash escape sequences
to force non-smart punctuation. It does so by transforming the escape
sequence into a decimal-encoded HTML entity:

Escape  Value  Character
------  -----  ---------
  \    \    
  "    "    "
  '    '    '
  .    .    .
  -    -    -
  `    `    `

This is useful, for example, when you want to use straight quotes as
foot and inch marks:

6'2" tall

translates into:

6'2" tall

in SmartyPants’s HTML output. Which, when rendered by a web browser,
looks like:

6'2" tall

Requirements

This library package requires PHP 5.3 or later.
Note: The older plugin/library hybrid package for PHP SmartyPants and
PHP SmartyPants Typographer is still will work with PHP 4.0.5 and later.

Usage

This library package is meant to be used with class autoloading. For autoloading
to work, your project needs have setup a PSR-0-compatible autoloader. See the
included Readme.php file for a minimal autoloader setup. (If you don’t want to
use autoloading you can do a classic require_once to manually include the
files prior use instead.)
With class autoloading in place, putting the ‘Michelf’ folder in your
include path should be enough for this to work:

use MichelfSmartyPants;
$html_output = SmartyPants::defaultTransform($html_input);

SmartyPants Typographer is also available the same way:

use MichelfSmartyPantsTypographer;
$html_output = SmartyPantsTypographer::defaultTransform($html_input);

If you are using PHP SmartyPants with another text filter function that
generates HTML such as Markdown, you should filter the text after the
the HTML-generating filter. This is an example with PHP Markdown:

use MichelfMarkdown, MichelfSmartyPants;
$my_html = Markdown::defaultTransform($my_text);
$my_html = SmartyPants::defaultTransform($my_html);

To learn more about configuration options, see the full list of
configuration variables.

Usage Without an Autoloader

If you cannot use class autoloading, you can still use include or require to
access the parser. To load the MichelfSmartyPants parser, do it this way:

require_once 'Michelf/SmartyPants.inc.php';

Or, if you need the MichelfSmartyPantsTypographer parser:

require_once 'Michelf/SmartyPantsTypographer.inc.php';

While the plain .php files depend on autoloading to work correctly, using the
.inc.php files instead will eagerly load the dependencies that would be loaded
on demand if you were using autoloading.

Algorithmic Shortcomings

One situation in which quotes will get curled the wrong way is when
apostrophes are used at the start of leading contractions. For example:

'Twas the night before Christmas.

In the case above, SmartyPants will turn the apostrophe into an opening
single-quote, when in fact it should be a closing one. I don’t think
this problem can be solved in the general case — every word processor
I’ve tried gets this wrong as well. In such cases, it’s best to use the
proper HTML entity for closing single-quotes (’ or ’) by
hand.

Bugs

To file bug reports or feature requests (other than topics listed in the
Caveats section above) please send email to:
michel.fortin@michelf.ca
If the bug involves quotes being curled the wrong way, please send
example text to illustrate.

Version History

PHP SmartyPants Lib 1.8.1 (12 Dec 2016)

Fixed an issue introduced in 1.8.0 where backtick quotes were broken.

PHP SmartyPants Lib 1.8.0 (13 Nov 2016)

Can now set replacement characters for all transformations using
configuration variables, including ellipses and dashes.
Relocated replacement quotes configuration variables from
SmartyPantsTyppographer to SmartyPants. Also relocated
decodeEntitiesInConfiguration() to follow the configuration variables.

Added conversion of apostrophe and double quote to Hebrew Geresh
and Gershayim when the apostrophe or double quote is surrounded on
both sides by a Hebrew character. For instance:

input:  צה"ל / צ'ארלס
output: צה״ל / צ׳ארלס

<p>
  You can still put quotes around Hebrew words and they&#8217;ll become curled<br /> quotation marks (if that is enabled). This new transform only applies<br /> in the middle of a word, and only to words in Hebrew. </li> </ul> 
  
  <p>
    PHP SmartyPants Lib 1.7.1 (16 Oct 2016)
  </p>
  
  <ul dir="auto">
    <li>
      Fixing bug where <code>decodeEntitiesInConfiguration()</code> would cause the<br /> configuration to set the space for units to an empty string.
    </li>
  </ul>
  
  <p>
    PHP SmartyPants Lib 1.7.0 (15 Oct 2016)
  </p>
  
  <ul dir="auto">
    <li>
      Made <code>public</code> some configuration variables that were documented<br /> were documented as <code>public</code> but were actually <code>protected</code>.
    </li>
    <li>
      Added the <code>decodeEntitiesInConfiguration()</code> method on<br /> <code>SmartyPantsTypographer</code> to quickly convert HTML entities in configuration<br /> variables to their corresponding UTF-8 character.
    </li>
  </ul>
  
  <p>
    PHP SmartyPants Lib 1.6.0 (10 Oct 2016)<br /> This is the first release of PHP SmartyPants Lib. This package requires PHP<br /> version 5.3 or later and is designed to work with PSR-0 autoloading and,<br /> optionally with Composer. Here is a list of the changes since<br /> PHP SmartyPants 1.5.1f:
  </p>
  
  <ul dir="auto">
    <li>
      Plugin interface for WordPress and Smarty is no longer present in<br /> the Lib package. The classic package is still available if you need it:<br /> <a rel="nofollow noopener" target="_blank" href="https://michelf.ca/projects/php-markdown/classic/">https://michelf.ca/projects/php-markdown/classic/</a>
    </li>
    <li>
      SmartyPants parser is now encapsulated in its own class, with methods and<br /> configuration variables <code>public</code> and <code>protected</code> protection attributes.<br /> This has been available in unreleased versions since a few years, but now<br /> it&#8217;s official.
    </li>
    <li>
      SmartyPants now works great with PSR-0 autoloading and Composer. If<br /> however you prefer to more directly <code>require_once</code> the files, the<br /> &#8220;.inc.php&#8221; variants of the file will make sure everything is included.
    </li>
    <li>
      For those of you who cannot use class autoloading, you can now<br /> include <code>Michelf/SmartyPants.inc.php</code> or<br /> <code>Michelf/SmartyPantsTypographer.inc.php</code> (note the <code>.inc.php</code> extension)<br /> to automatically include other files required by the parser.
    </li>
  </ul>