NAME¶
Text::Textile - A humane web text generator.
SYNOPSIS¶
use Text::Textile qw(textile);
my $text = <<EOT;
h1. Heading
A _simple_ demonstration of Textile markup.
* One
* Two
* Three
"More information":http://www.textism.com/tools/textile is available.
EOT
# procedural usage
my $html = textile($text);
print $html;
# OOP usage
my $textile = new Text::Textile;
$html = $textile->process($text);
print $html;
ABSTRACT¶
Text::Textile is a Perl-based implementation of Dean Allen's Textile syntax.
Textile is shorthand for doing common formatting tasks.
METHODS¶
new( [%options] )¶
Instantiates a new Text::Textile object. Optional options can be passed to
initialize the object. Attributes for the options key are the same as the
get/set method names documented here.
set( $attribute, $value )¶
Used to set Textile attributes. Attribute names are the same as the get/set
method names documented here.
get( $attribute )¶
Used to get Textile attributes. Attribute names are the same as the get/set
method names documented here.
disable_html( [$disable] )¶
Gets or sets the "disable html" control, which allows you to prevent
HTML tags from being used within the text processed. Any HTML tags encountered
will be removed if disable html is enabled. Default behavior is to allow HTML.
flavor( [$flavor] )¶
Assigns the HTML flavor of output from Text::Textile. Currently these are the
valid choices: html, xhtml (behaves like "xhtml1"), xhtml1, xhtml2.
Default flavor is "xhtml1".
Note that the xhtml2 flavor support is experimental and incomplete (and will
remain that way until the XHTML 2.0 draft becomes a proper recommendation).
css( [$css] )¶
Gets or sets the CSS support for Textile. If CSS is enabled, Textile will emit
CSS rules. You may pass a 1 or 0 to enable or disable CSS behavior altogether.
If you pass a hashref, you may assign the CSS class names that are used by
Text::Textile. The following key names for such a hash are recognized:
- class_align_right
- defaults to "right"
- class_align_left
- defaults to "left"
- class_align_center
- defaults to "center"
- class_align_top
- defaults to "top"
- class_align_bottom
- defaults to "bottom"
- class_align_middle
- defaults to "middle"
- class_align_justify
- defaults to "justify"
- class_caps
- defaults to "caps"
- class_footnote
- defaults to "footnote"
- id_footnote_prefix
- defaults to "fn"
charset( [$charset] )¶
Gets or sets the character set targeted for publication. At this time,
Text::Textile only changes its behavior if the "utf-8" character set
is assigned.
Specifically, if utf-8 is requested, any special characters created by Textile
will be output as native utf-8 characters rather than HTML entities.
docroot( [$path] )¶
Gets or sets the physical file path to root of document files. This path is
utilized when images are referenced and size calculations are needed (the
Image::Size module is used to read the image dimensions).
trim_spaces( [$trim] )¶
Gets or sets the "trim spaces" control flag. If enabled, this will
clear any lines that have only spaces on them (the newline itself will
remain).
preserve_spaces( [$preserve] )¶
Gets or sets the "preserve spaces" control flag. If enabled, this will
replace any double spaces within the paragraph data with the   HTML
entity (wide space). The default is 0. Spaces will pass through to the browser
unchanged and render as a single space. Note that this setting has no effect
on spaces within "<pre>", "<code>" or
"<script>".
filter_param( [$data] )¶
Gets or sets a parameter that is passed to filters.
filters( [\%filters] )¶
Gets or sets a list of filters to make available for Text::Textile to use.
Returns a hash reference of the currently assigned filters.
char_encoding( [$encode] )¶
Gets or sets the character encoding logical flag. If character encoding is
enabled, the HTML::Entities package is used to encode special characters. If
character encoding is disabled, only "<", ">",
""" and "&" are encoded to HTML entities.
disable_encode_entities( $boolean )¶
Gets or sets the disable encode entities logical flag. If this value is set to
true no entities are encoded at all. This also supersedes the
"char_encoding" flag.
handle_quotes( [$handle] )¶
Gets or sets the "smart quoting" control flag. Returns the current
setting.
process( $str )¶
Alternative method for invoking the textile method.
textile( $str )¶
Can be called either procedurally or as a method. Transforms
$str using Textile markup rules.
Processes a single paragraph. The following attributes are allowed:
- text
- The text to be processed.
Processes an inline string (plaintext) for Textile syntax. The following
attributes are allowed:
- text
- The text to be processed.
Responsible for processing a particular macro. Arguments passed include:
- pre
- open brace character
- post
- close brace character
- macro
- the macro to be executed
The return value from this method would be the replacement text for the macro
given. If the macro is not defined, it will return pre + macro + post, thereby
preserving the original macro string.
Processes text for a citation tag. The following attributes are allowed:
- pre
- Any text that comes before the citation.
- text
- The text that is being cited.
- cite
- The URL of the citation.
- post
- Any text that follows the citation.
Processes '@...@' type blocks (code snippets). The following attributes are
allowed:
- text
- The text of the code itself.
- lang
- The language (programming language) for the code.
Returns a string of tag attributes to accommodate the class, style and symbols
present in $clsty.
$clsty is checked for:
- "{...}"
- style rules. If present, they are appended to $style.
- "(...#...)"
- class and/or ID name declaration
- "(" (one or more)
- pad left characters
- ")" (one or more)
- pad right characters
- "[ll]"
- language declaration
The attribute string returned will contain any combination of class, id, style
and/or lang attributes.
Constructs an HTML tag. Accepted arguments:
- tag
- the tag to produce
- text
- the text to output inside the tag
- pre
- text to produce before the tag
- post
- text to produce following the tag
- clsty
- class and/or style attributes that should be assigned to the tag.
Takes a Textile formatted list (numeric or bulleted) and returns the markup for
it. Text that is passed in requires substantial parsing, so the format_list
method is a little involved. But it should always produce a proper ordered or
unordered list. If it cannot (due to misbalanced input), it will return the
original text. Arguments accepted:
- text
- The text to be processed.
Processes "==xxxxx==" type blocks for filters. A filter would follow
the open "==" sequence and is specified within pipe characters, like
so:
==|filter|text to be filtered==
You may specify multiple filters in the filter portion of the string. Simply
comma delimit the filters you desire to execute. Filters are defined using the
filters method.
Takes the Textile link attributes and transforms them into a hyperlink.
Takes the given $url and transforms it appropriately.
Returns markup for the given image. $src is the location of the image, $extra
contains the optional height/width and/or alt text. $url is an optional
hyperlink for the image. $class holds the optional CSS class attribute.
Arguments you may pass:
- src
- The "src" (URL) for the image. This may be a local path, ideally
starting with a "/". Images can be located within the file
system if the docroot method is used to specify where the docroot resides.
If the image can be found, the image_size method is used to determine the
dimensions of the image.
- extra
- Additional parameters for the image. This would include alt text,
height/width specification or scaling instructions.
- align
- Alignment attribute.
- pre
- Text to produce prior to the tag.
- post
- Text to produce following the tag.
- link
- Optional URL to connect with the image tag.
- clsty
- Class and/or style attributes.
Takes a Wiki-ish string of data and transforms it into a full table.
apply_filters( %args )¶
The following attributes are allowed:
- text
- The text to be processed.
- filters
- An array reference of filter names to run for the given text.
encode_html( $html, $can_double_encode )¶
Encodes input $html string, escaping characters as needed to HTML entities. This
relies on the HTML::Entities package for full effect. If unavailable,
encode_html_basic is used as a fallback technique. If the
"char_encoding" flag is set to false, encode_html_basic is used
exclusively.
decode_html( $html )¶
Decodes HTML entities in $html to their natural character equivelants.
encode_html_basic( $html, $can_double_encode )¶
Encodes the input $html string for the following characters: <, >, &
and ". If $can_double_encode is true, all ampersand characters are
escaped even if they already were. If $can_double_encode is false, ampersands
are only escaped when they aren't part of a HTML entity already.
image_size( $file )¶
Returns the size for the image identified in $file. This method relies upon the
Image::Size Perl package. If unavailable, image_size will return undef.
Otherwise, the expected return value is a list of the width and height (in
that order), in pixels.
encode_url( $str )¶
Encodes the query portion of a URL, escaping characters as necessary.
mail_encode( $email )¶
Encodes the email address in
$email for "mailto:"
links.
process_quotes( $str )¶
Processes string, formatting plain quotes into curly quotes.
default_macros¶
Returns a hashref of macros that are assigned to be processed by default within
the format_inline method.
_halign( $alignment )¶
Returns the alignment keyword depending on the symbol passed.
- "<>"
- becomes "justify"
- "<"
- becomes "left"
- ">"
- becomes "right"
- "="
- becomes "center"
_valign( $alignment )¶
Returns the alignment keyword depending on the symbol passed.
- "^"
- becomes "top"
- "~"
- becomes "bottom"
- "-"
- becomes "middle"
_imgalign( $alignment )¶
Returns the alignment keyword depending on the symbol passed. The following
alignment symbols are recognized, and given preference in the order listed:
- "^"
- becomes "top"
- "~"
- becomes "bottom"
- "-"
- becomes "middle"
- "<"
- becomes "left"
- ">"
- becomes "right"
_repl( \@arr, $str )¶
An internal routine that takes a string and appends it to an array. It returns a
marker that is used later to restore the preserved string.
_tokenize( $str )¶
An internal routine responsible for breaking up a string into individual tag and
plaintext elements.
_css_defaults¶
Sets the default CSS names for CSS controlled markup. This is an internal
function that should not be called directly.
_strip_borders( $pre, $post )¶
This utility routine will take "border" characters off of the given
$pre and $post strings if they match one of these conditions:
$pre starts with "[", $post ends with "]"
$pre starts with "{", $post ends with "}"
If neither condition is met, then the $pre and $post values are left untouched.
SYNTAX¶
Text::Textile processes text in units of blocks and lines. A block might also be
considered a paragraph, since blocks are separated from one another by a blank
line. Blocks can begin with a signature that helps identify the rest of the
block content. Block signatures include:
- p
- A paragraph block. This is the default signature if no signature is
explicitly given. Paragraphs are formatted with all the inline rules (see
inline formatting) and each line receives the appropriate markup rules for
the flavor of HTML in use. For example, newlines for XHTML content receive
a "<br />" tag at the end of the line (with the exception
of the last line in the paragraph). Paragraph blocks are enclosed in a
"<p>" tag.
- pre
- A pre-formatted block of text. Textile will not add any HTML tags for
individual lines. Whitespace is also preserved.
Note that within a "pre" block, < and > are translated into
HTML entities automatically.
- bc
- A "bc" signature is short for "block code", which
implies a preformatted section like the "pre" block, but it also
gets a "<code>" tag (or for XHTML 2, a
"<blockcode>" tag is used instead).
Note that within a "bc" block, < and > are translated into
HTML entities automatically.
- table
- For composing HTML tables. See the "TABLES" section for more
information.
- bq
- A "bq" signature is short for "block quote". Paragraph
text formatting is applied to these blocks and they are enclosed in a
<blockquote> tag as well as <p> tags within.
- h1, h2, h3, h4, h5, h6
- Headline signatures that produce "<h1>", etc. tags. You
can adjust the relative output of these using the head_offset
attribute.
- clear
- A "clear" signature is simply used to indicate that the next
block should emit a CSS style attribute that clears any floating elements.
The default behavior is to clear "both", but you can use the
left (<) or right (>) alignment characters to indicate which side to
clear.
- dl
- A "dl" signature is short for "definition list". See
the "LISTS" section for more information.
- fn
- A "fn" signature is short for "footnote". You add a
number following the "fn" keyword to number the footnote.
Footnotes are output as paragraph tags but are given a special CSS class
name which can be used to style them as you see fit.
All signatures should end with a period and be followed with a space. Inbetween
the signature and the period, you may use several parameters to further
customize the block. These include:
- "{style rule}"
- A CSS style rule. Style rules can span multiple lines.
- "[ll]"
- A language identifier (for a "lang" attribute).
- "(class)" or "(#id)" or "(class#id)"
- For CSS class and id attributes.
- ">", "<", "=",
"<>"
- Modifier characters for alignment. Right-justification,
left-justification, centered, and full-justification.
- "(" (one or more)
- Adds padding on the left. 1em per "(" character is applied. When
combined with the align-left or align-right modifier, it makes the block
float.
- ")" (one or more)
- Adds padding on the right. 1em per ")" character is applied.
When combined with the align-left or align-right modifier, it makes the
block float.
- "|filter|" or "|filter|filter|filter|"
- A filter may be invoked to further format the text for this signature. If
one or more filters are identified, the text will be processed first using
the filters and then by Textile's own block formatting rules.
Extended Blocks¶
Normally, a block ends with the first blank line encountered. However, there are
situations where you may want a block to continue for multiple paragraphs of
text. To cause a given block signature to stay active, use two periods in your
signature instead of one. This will tell Textile to keep processing using that
signature until it hits the next signature is found.
For example:
bq.. This is paragraph one of a block quote.
This is paragraph two of a block quote.
p. Now we're back to a regular paragraph.
You can apply this technique to any signature (although for some it doesn't make
sense, like "h1" for example). This is especially useful for
"bc" blocks where your code may have many blank lines scattered
through it.
Escaping¶
Sometimes you want Textile to just get out of the way and let you put some
regular HTML markup in your document. You can disable Textile formatting for a
given block using the "==" escape mechanism:
p. Regular paragraph
==
Escaped portion -- will not be formatted
by Textile at all
==
p. Back to normal.
You can also use this technique within a Textile block, temporarily disabling
the inline formatting functions:
p. This is ==*a test*== of escaping.
Formatting within a block of text is covered by the "inline"
formatting rules. These operators must be placed up against text/punctuation
to be recognized. These include:
- *"strong"*
- Translates into <strong>strong</strong>.
- "_emphasis_"
- Translates into <em>emphasis</em>.
- **"bold"**
- Translates into <b>bold</b>.
- "__italics__"
- Translates into <i>italics</i>.
- "++bigger++"
- Translates into <big>bigger</big>.
- "--smaller--"
- Translates into: <small>smaller</small>.
- "-deleted text-"
- Translates into <del>deleted text</del>.
- "+inserted text+"
- Translates into <ins>inserted text</ins>.
- "^superscript^"
- Translates into <sup>superscript</sup>.
- "~subscript~"
- Translates into <sub>subscript</sub>.
- "%span%"
- Translates into <span>span</span>.
- "@code@"
- Translates into <code>code</code>. Note that within a
"@...@" section, < and > are translated into HTML entities
automatically.
Inline formatting operators accept the following modifiers:
- "{style rule}"
- A CSS style rule.
- "[ll]"
- A language identifier (for a "lang" attribute).
- "(class)" or "(#id)" or "(class#id)"
- For CSS class and id attributes.
Examples
Textile is *way* cool.
Textile is *_way_* cool.
Now this won't work, because the formatting characters need whitespace before
and after to be properly recognized.
Textile is way c*oo*l.
However, you can supply braces or brackets to further clarify that you want to
format, so this would work:
Textile is way c[*oo*]l.
You can create footnotes like this:
And then he went on a long trip[1].
By specifying the brackets with a number inside, Textile will recognize that as
a footnote marker. It will replace that with a construct like this:
And then he went on a long
trip<sup class="footnote"><a href="#fn1">1</a></sup>
To supply the content of the footnote, place it at the end of your document
using a "fn" block signature:
fn1. And there was much rejoicing.
Which creates a paragraph that looks like this:
<p class="footnote" id="fn1"><sup>1</sup> And there was
much rejoicing.</p>
Links¶
Textile defines a shorthand for formatting hyperlinks. The format looks like
this:
"Text to display":http://example.com
In addition to this, you can add "title" text to your link:
"Text to display (Title text)":http://example.com
The URL portion of the link supports relative paths as well as other protocols
like ftp, mailto, news, telnet, etc.
"E-mail me please":mailto:someone@example.com
You can also use single quotes instead of double-quotes if you prefer. As with
the inline formatting rules, a hyperlink must be surrounded by whitespace to
be recognized (an exception to this is common punctuation which can reside at
the end of the URL). If you have to place a URL next to some other text, use
the bracket or brace trick to do that:
You["gotta":http://example.com]seethis!
Textile supports an alternate way to compose links. You can optionally create a
lookup list of links and refer to them separately. To do this, place one or
more links in a block of it's own (it can be anywhere within your document):
[excom]http://example.com
[exorg]http://example.org
For a list like this, the text in the square brackets is used to uniquely
identify the link given. To refer to that link, you would specify it like
this:
"Text to display":excom
Once you've defined your link lookup table, you can use the identifiers any
number of times.
Images¶
Images are identified by the following pattern:
!/path/to/image!
Image attributes may also be specified:
!/path/to/image 10x20!
Which will render an image 10 pixels wide and 20 pixels high. Another way to
indicate width and height:
!/path/to/image 10w 20h!
You may also redimension the image using a percentage.
!/path/to/image 20%x40%!
Which will render the image at 20% of it's regular width and 40% of it's regular
height.
Or specify one percentage to resize proprotionately:
!/path/to/image 20%!
Alt text can be given as well:
!/path/to/image (Alt text)!
The path of the image may refer to a locally hosted image or can be a full URL.
You can also use the following modifiers after the opening "!"
character:
- "<"
- Align the image to the left (causes the image to float if CSS options are
enabled).
- ">"
- Align the image to the right (causes the image to float if CSS options are
enabled).
- "-" (dash)
- Aligns the image to the middle.
- "^"
- Aligns the image to the top.
- "~" (tilde)
- Aligns the image to the bottom.
- "{style rule}"
- Applies a CSS style rule to the image.
- "(class)" or "(#id)" or "(class#id)"
- Applies a CSS class and/or id to the image.
- "(" (one or more)
- Pads 1em on the left for each "(" character.
- ")" (one or more)
- Pads 1em on the right for each ")" character.
Character Replacements¶
A few simple, common symbols are automatically replaced:
(c)
(r)
(tm)
In addition to these, there are a whole set of character macros that are defined
by default. All macros are enclosed in curly braces. These include:
{c|} or {|c} cent sign
{L-} or {-L} pound sign
{Y=} or {=Y} yen sign
Many of these macros can be guessed. For example:
{A'} or {'A}
{a"} or {"a}
{1/4}
{*}
{:)}
{:(}
Lists¶
Textile also supports ordered and unordered lists. You simply place an asterisk
or pound sign, followed with a space at the start of your lines.
Simple lists:
* one
* two
* three
Multi-level lists:
* one
** one A
** one B
*** one B1
* two
** two A
** two B
* three
Ordered lists:
# one
# two
# three
Styling lists:
(class#id)* one
* two
* three
The above sets the class and id attributes for the <ul> tag.
*(class#id) one
* two
* three
The above sets the class and id attributes for the first <li> tag.
Definition lists:
dl. textile:a cloth, especially one manufactured by weaving
or knitting; a fabric
format:the arrangement of data for storage or display.
Note that there is no space between the term and definition. The term must be at
the start of the line (or following the "dl" signature as shown
above).
Tables¶
Textile supports tables. Tables must be in their own block and must have pipe
characters delimiting the columns. An optional block signature of
"table" may be used, usually for applying style, class, id or other
options to the table element itself.
From the simple:
|a|b|c|
|1|2|3|
To the complex:
table(fig). {color:red}_|Top|Row|
{color:blue}|/2. Second|Row|
|_{color:green}. Last|
Modifiers can be specified for the table signature itself, for a table row
(prior to the first "|" character) and for any cell (following the
"|" for that cell). Note that for cells, a period followed with a
space must be placed after any modifiers to distinguish the modifier from the
cell content.
Modifiers allowed are:
- "{style rule}"
- A CSS style rule.
- "(class)" or "(#id)" or "(class#id)"
- A CSS class and/or id attribute.
- "(" (one or more)
- Adds 1em of padding to the left for each "(" character.
- ")" (one or more)
- Adds 1em of padding to the right for each ")" character.
- "<"
- Aligns to the left (floats to left for tables if combined with the
")" modifier).
- ">"
- Aligns to the right (floats to right for tables if combined with the
"(" modifier).
- "="
- Aligns to center (sets left, right margins to "auto" for
tables).
- "<>"
- For cells only. Justifies text.
- "^"
- For rows and cells only. Aligns to the top.
- "~" (tilde)
- For rows and cells only. Aligns to the bottom.
- "_" (underscore)
- Can be applied to a table row or cell to indicate a header row or
cell.
- "\2" or "\3" or "\4", etc.
- Used within cells to indicate a colspan of 2, 3, 4, etc. columns. When you
see "\", think "push forward".
- "/2" or "/3" or "/4", etc.
- Used within cells to indicate a rowspan or 2, 3, 4, etc. rows. When you
see "/", think "push downward".
When a cell is identified as a header cell and an alignment is specified, that
becomes the default alignment for cells below it. You can always override this
behavior by specifying an alignment for one of the lower cells.
CSS Notes¶
When CSS is enabled (and it is by default), CSS class names are automatically
applied in certain situations.
- Aligning a block or span or other element to left, right, etc.
- "left" for left justified, "right" for right
justified, "center" for centered text, "justify" for
full-justified text.
- Aligning an image to the top or bottom
- "top" for top alignment, "bottom" for bottom
alignment, "middle" for middle alignment.
- Footnotes
- "footnote" is applied to the paragraph tag for the footnote text
itself. An id of "fn" plus the footnote number is placed on the
paragraph for the footnote as well. For the footnote superscript tag, a
class of "footnote" is used.
- Capped text
- For a series of characters that are uppercased, a span is placed around
them with a class of "caps".
Miscellaneous¶
Textile tries to do it's very best to ensure proper XHTML syntax. It will even
attempt to fix errors you may introduce writing in HTML yourself. Unescaped
"&" characters within URLs will be properly escaped. Singlet
tags such as br, img and hr are checked for the "/" terminator (and
it's added if necessary). The best way to make sure you produce valid XHTML
with Textile is to not use any HTML markup at all-- use the Textile syntax and
let it produce the markup for you.
BUGS & SOURCE¶
Text::Textile is hosted at github.
Source: <
http://github.com/bradchoate/text-textile/tree/master>
Bugs: <
http://github.com/bradchoate/text-textile/issues>
COPYRIGHT & LICENSE¶
Copyright 2005-2009 Brad Choate, brad@bradchoate.com.
This program is free software; you can redistribute it and/or modify it under
the terms of either:
- •
- the GNU General Public License as published by the Free Software
Foundation; either version 1, or (at your option) any later version,
or
- •
- the Artistic License version 2.0.
Text::Textile is an adaptation of Textile, developed by Dean Allen of
Textism.com.