Changes between Initial Version and Version 1 of WikiProcessors


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Timestamp:
Oct 17, 2016 3:38:00 PM (5 years ago)
Author:
trac
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  • WikiProcessors

    v1 v1  
     1= Wiki Processors
     2
     3Processors are WikiMacros designed to provide alternative markup formats for the [TracWiki Wiki engine]. Processors can be thought of as ''macro functions to process user-edited text''.
     4
     5Wiki processors can be used in any Wiki text throughout Trac, such as:
     6 - [#CodeHighlightingSupport syntax highlighting] or for rendering text verbatim
     7 - rendering [#HTMLrelated Wiki markup inside a context], like inside <div> blocks or <span> or within <td> or <th> table cells
     8 - using an alternative markup syntax, like [wiki:WikiHtml raw HTML] and [wiki:WikiRestructuredText Restructured Text] or [http://www.textism.com/tools/textile/ textile]
     9
     10== Using Processors
     11
     12To use a processor on a block of text, first delimit the lines using a Wiki ''code block'':
     13{{{
     14{{{
     15The lines
     16that should be processed...
     17}}}
     18}}}
     19
     20Immediately after the `{{{` or on the line just below, add `#!` followed by the ''processor name'':
     21
     22{{{
     23{{{
     24#!processorname
     25The lines
     26that should be processed...
     27}}}
     28}}}
     29
     30This is the "shebang" notation, familiar to most UNIX users.
     31
     32Besides their content, some Wiki processors can also accept ''parameters'', which are then given as `key=value` pairs after the processor name and on the same line. If `value` has to contain space, as it's often the case for the style parameter, a quoted string can be used (`key="value with space"`).
     33
     34As some processors are meant to process Wiki markup, it's quite possible to ''nest'' processor blocks.
     35You may want to indent the content of nested blocks for increased clarity, this extra indentation will be ignored when processing the content.
     36
     37== Examples
     38
     39||= Wiki Markup =||= Display =||
     40{{{#!td colspan=2 align=center style="border: none"
     41
     42                __Example 1__: Inserting raw HTML
     43}}}
     44|-----------------------------------------------------------------
     45{{{#!td style="border: none"
     46{{{
     47{{{
     48#!html
     49<h1 style="color: grey">This is raw HTML</h1>
     50}}}
     51}}}
     52}}}
     53{{{#!td valign=top style="border: none; padding-left: 2em"
     54{{{
     55#!html
     56<h1 style="color: grey">This is raw HTML</h1>
     57}}}
     58}}}
     59|-----------------------------------------------------------------
     60{{{#!td colspan=2 align=center style="border: none"
     61
     62     __Example 2__: Highlighted Python code in a <div> block with custom style
     63}}}
     64|-----------------------------------------------------------------
     65{{{#!td style="border: none"
     66  {{{
     67  {{{#!div style="background: #ffd; border: 3px ridge"
     68
     69  This is an example of embedded "code" block:
     70
     71    {{{
     72    #!python
     73    def hello():
     74        return "world"
     75    }}}
     76
     77  }}}
     78  }}}
     79}}}
     80{{{#!td valign=top style="border: none; padding: 1em"
     81  {{{#!div style="background: #ffd; border: 3px ridge"
     82
     83  This is an example of embedded "code" block:
     84
     85    {{{
     86    #!python
     87    def hello():
     88        return "world"
     89    }}}
     90
     91  }}}
     92}}}
     93|-----------------------------------------------------------------
     94{{{#!td colspan=2 align=center style="border: none"
     95
     96     __Example 3__: Searching tickets from a wiki page, by keywords.
     97}}}
     98|-----------------------------------------------------------------
     99{{{#!td style="border: none"
     100  {{{
     101  {{{
     102  #!html
     103  <form action="/query" method="get"><div>
     104  <input type="text" name="keywords" value="~" size="30"/>
     105  <input type="submit" value="Search by Keywords"/>
     106  <!-- To control what fields show up use hidden fields
     107  <input type="hidden" name="col" value="id"/>
     108  <input type="hidden" name="col" value="summary"/>
     109  <input type="hidden" name="col" value="status"/>
     110  <input type="hidden" name="col" value="milestone"/>
     111  <input type="hidden" name="col" value="version"/>
     112  <input type="hidden" name="col" value="owner"/>
     113  <input type="hidden" name="col" value="priority"/>
     114  <input type="hidden" name="col" value="component"/>
     115  -->
     116  </div></form>
     117  }}}
     118  }}}
     119}}}
     120{{{#!td valign=top style="border: none; padding: 1em"
     121  {{{
     122  #!html
     123  <form action="/query" method="get"><div>
     124  <input type="text" name="keywords" value="~" size="30"/>
     125  <input type="submit" value="Search by Keywords"/>
     126  <!-- To control what fields show up use hidden fields
     127  <input type="hidden" name="col" value="id"/>
     128  <input type="hidden" name="col" value="summary"/>
     129  <input type="hidden" name="col" value="status"/>
     130  <input type="hidden" name="col" value="milestone"/>
     131  <input type="hidden" name="col" value="version"/>
     132  <input type="hidden" name="col" value="owner"/>
     133  <input type="hidden" name="col" value="priority"/>
     134  <input type="hidden" name="col" value="component"/>
     135  -->
     136  </div></form>
     137  }}}
     138}}}
     139
     140== Available Processors
     141
     142The following processors are included in the Trac distribution:
     143
     144|| '''`#!default`''' || Present the text verbatim in a preformatted text block. This is the same as specifying ''no'' processor name (and no `#!`) ||
     145|| '''`#!comment`''' || Do not process the text in this section, i.e. contents exist only in the plain text - not in the rendered page. ||
     146|| '''`#!rtl`''' || Introduce a Right-To-Left block with appropriate CSS direction and styling ''(since 0.12.2)'' ||
     147|||| ||
     148||||= '''[=#HTMLrelated HTML related]''' =||
     149|| '''`#!html`''' || Insert custom HTML in a wiki page. ||
     150|| '''`#!htmlcomment`''' || Insert an HTML comment in a wiki page (''since 0.12''). ||
     151|| || Note that `#!html` blocks have to be ''self-contained'', i.e. you can't start an HTML element in one block and close it later in a second block. Use the following processors for achieving a similar effect.  ||
     152|| '''`#!div`''' || Wrap an arbitrary Wiki content inside a <div> element (''since 0.11''). ||
     153|| '''`#!span`''' || Wrap an arbitrary Wiki content inside a <span> element (''since 0.11''). ||
     154|| '''`#!td`''' || Wrap an arbitrary Wiki content inside a <td> element (''since 0.12'') ||
     155|| '''`#!th`''' || Wrap an arbitrary Wiki content inside a <th> element (''since 0.12'') ||
     156|| '''`#!tr`''' || Can optionally be used for wrapping `#!td` and `#!th` blocks, either for specifying row attributes or better visual grouping (''since 0.12'') ||
     157|| '''`#!table`''' || Can optionally be used for wrapping `#!tr`, `#!td` and `#!th` blocks, for specifying table attributes. One current limitation however is that tables cannot be nested. (''since 0.12'') ||
     158|| || See WikiHtml for example usage and more details about these processors. ||
     159|||| ||
     160||||= '''Other Markups''' =||
     161|| '''`#!rst`''' || Trac support for Restructured Text. See WikiRestructuredText. ||
     162|| '''`#!textile`''' || Supported if [http://cheeseshop.python.org/pypi/textile Textile] is installed. See [http://www.textism.com/tools/textile/ a Textile reference]. ||
     163|||| ||
     164||||= '''[=#CodeHighlightingSupport Code Highlighting Support]''' =||
     165|| '''`#!c`''' [[BR]] '''`#!cpp`''' (C++) [[BR]] '''`#!python`''' [[BR]] '''`#!perl`''' [[BR]] '''`#!ruby`''' [[BR]] '''`#!php`''' [[BR]] '''`#!asp`''' [[BR]] '''`#!java`''' [[BR]] '''`#!js`''' (Javascript) [[BR]] '''`#!sql`''' [[BR]] '''`#!xml`''' (XML or HTML) [[BR]] '''`#!sh`''' (!Bourne/Bash shell) [[BR]] '''etc.''' [[BR]] || Trac includes processors to provide inline syntax highlighting for source code in various languages. [[BR]] [[BR]] Trac relies on external software packages for syntax coloring, like [http://pygments.org Pygments]. [[BR]] [[BR]] See TracSyntaxColoring for information about which languages are supported and how to enable support for more languages. ||
     166|||| ||
     167
     168Since 1.1.2 the default, coding highlighting and MIME-type processors support the argument `lineno` for adding line numbering to the code block. When a value is specified, as in `lineno=3`, the numbering will start at the specified value. When used in combination with the `lineno` argument, the `marks` argument is also supported for highlighting lines. A single line number, set of line numbers and range of line numbers are allowed. For example, `marks=3`, `marks=3-6`, `marks=3,5,7` and `marks=3-5,7` are all allowed. The specified values are relative to the numbered lines, so if `lineno=2` is specified to start the line numbering at 2, `marks=2` will result in the first line being highlighted.
     169
     170Using the MIME type as processor, it is possible to syntax-highlight the same languages that are supported when browsing source code.
     171
     172||||= '''MIME Type Processors''' =||
     173{{{#!tr
     174{{{#!td
     175Some examples:
     176 {{{
     177{{{
     178#!text/html
     179<h1>text</h1>
     180}}}
     181 }}}
     182}}}
     183{{{#!td
     184The result will be syntax highlighted HTML code:
     185 {{{
     186#!text/html
     187<h1>text</h1>
     188 }}}
     189
     190The same is valid for all other [TracSyntaxColoring#SyntaxColoringSupport mime types supported].
     191}}}
     192}}}
     193{{{#!td
     194 {{{
     195{{{
     196#!diff
     197--- Version 55
     198+++ Version 56
     199@@ -115,8 +115,9 @@
     200     name='TracHelloWorld', version='1.0',
     201     packages=find_packages(exclude=['*.tests*']),
     202-    entry_points = """
     203-        [trac.plugins]
     204-        helloworld = myplugs.helloworld
     205-    """,
     206+    entry_points = {
     207+        'trac.plugins': [
     208+            'helloworld = myplugs.helloworld',
     209+        ],
     210+    },
     211 )
     212}}}
     213 }}}
     214}}}
     215{{{#!td
     216'''`#!diff`''' has a particularly nice renderer:
     217 {{{
     218#!diff
     219--- Version 55
     220+++ Version 56
     221@@ -115,8 +115,9 @@
     222     name='TracHelloWorld', version='1.0',
     223     packages=find_packages(exclude=['*.tests*']),
     224-    entry_points = """
     225-        [trac.plugins]
     226-        helloworld = myplugs.helloworld
     227-    """,
     228+    entry_points = {
     229+        'trac.plugins': [
     230+            'helloworld = myplugs.helloworld',
     231+        ],
     232+    },
     233 )
     234 }}}
     235}}}
     236
     237Line numbers can be added to code blocks and lines can be highlighted //(since 1.1.2)//.
     238{{{
     239{{{#!python lineno=3 marks=3,9-10,16
     240def expand_markup(stream, ctxt=None):
     241    """A Genshi stream filter for expanding `genshi.Markup` events.
     242
     243    Note: Expansion may not be possible if the fragment is badly
     244    formed, or partial.
     245    """
     246    for event in stream:
     247        if isinstance(event[1], Markup):
     248            try:
     249                for subevent in HTML(event[1]):
     250                    yield subevent
     251            except ParseError:
     252                yield event
     253        else:
     254            yield event
     255}}}
     256}}}
     257{{{#!python lineno=3 marks=3,9-10,16
     258def expand_markup(stream, ctxt=None):
     259    """A Genshi stream filter for expanding `genshi.Markup` events.
     260
     261    Note: Expansion may not be possible if the fragment is badly
     262    formed, or partial.
     263    """
     264    for event in stream:
     265        if isinstance(event[1], Markup):
     266            try:
     267                for subevent in HTML(event[1]):
     268                    yield subevent
     269            except ParseError:
     270                yield event
     271        else:
     272            yield event
     273}}}
     274
     275For more processor macros developed and/or contributed by users, visit the [th:WikiStart Trac Hacks] community site.
     276
     277Developing processors is no different from Wiki macros. In fact, they work the same way, only the usage syntax differs. See WikiMacros#DevelopingCustomMacros for more information.
     278
     279----
     280See also: WikiMacros, WikiHtml, WikiRestructuredText, TracSyntaxColoring, WikiFormatting, TracGuide