Changes between Version 3 and Version 4 of WikiProcessors

Timestamp:

Jul 17, 2018, 2:11:46 PM (6 years ago)

Author:

trac

Comment:

--

WikiProcessors

@@ -1 @@
-= Wiki Processors =
+= Wiki Processors
 
 Processors 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''. 
 
-Wiki processors can be used in any Wiki text throughout Trac,
-for various different purposes, like:
- - [#CodeHighlightingSupport syntax highlighting] or for rendering text verbatim,
- - rendering [#HTMLrelated Wiki markup inside a context], 
-   like inside <div> blocks or <span> or within <td> or <th> table cells,
- - using an alternative markup syntax, like [wiki:WikiHtml raw HTML] and
-   [wiki:WikiRestructuredText Restructured Text],
-   or [http://www.textism.com/tools/textile/ textile]
-
-
-== Using Processors ==
-
-To use a processor on a block of text, first delimit the lines using
-a Wiki ''code block'':
+Wiki processors can be used in any Wiki text throughout Trac, such as:
+ - [#CodeHighlightingSupport syntax highlighting] or for rendering text verbatim
+ - rendering [#HTMLrelated Wiki markup inside a context], like inside <div> blocks or <span> or within <td> or <th> table cells
+ - using an alternative markup syntax, like [WikiHtml raw HTML] and [WikiRestructuredText Restructured Text] or [http://www.textism.com/tools/textile/ textile]
+
+== Using Processors
+
+To use a processor on a block of text, first delimit the lines using a Wiki ''code block'':
 {{{
 {{{
@@ -24 +18 @@
 }}}
 
-Immediately after the `{{{` or on the line just below, 
-add `#!` followed by the ''processor name''.
+Immediately after the `{{{` or on the line just below, add `#!` followed by the ''processor name'':
 
 {{{
@@ -37 +30 @@
 This is the "shebang" notation, familiar to most UNIX users.
 
-Besides their content, some Wiki processors can also accept ''parameters'',
-which are then given as `key=value` pairs after the processor name, 
-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"`).
-
-As some processors are meant to process Wiki markup, it's quite possible to
-''nest'' processor blocks.
-You may want to indent the content of nested blocks for increased clarity,
-this extra indentation will be ignored when processing the content.
-
-
-== Examples ==
+Besides 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"`).
+
+As some processors are meant to process Wiki markup, it's quite possible to ''nest'' processor blocks.
+You may want to indent the content of nested blocks for increased clarity, this extra indentation will be ignored when processing the content.
+
+== Examples
 
 ||= Wiki Markup =||= Display =||
@@ -150 +137 @@
   }}}
 }}}
-== Available Processors ==
+
+== Available Processors
 
 The following processors are included in the Trac distribution:
 
-|| '''`#!default`''' || Present the text verbatim in a preformatted text block. This is the same as specifying ''no'' processor name (and no `#!`) ||
-|| '''`#!comment`''' || Do not process the text in this section (i.e. contents exist only in the plain text - not in the rendered page). ||
-|||| ||
-||||= '''HTML related''' =||
+|| '''`#!default`''' || Present the text verbatim in a preformatted text block. This is the same as specifying ''no'' processor name (and no `#!`). ||
+|| '''`#!comment`''' || Do not process the text in this section, i.e. contents exist only in the plain text - not in the rendered page. ||
+|| '''`#!rtl`''' || Introduce a Right-To-Left block with appropriate CSS direction and styling. ''(since 0.12.2)'' ||
+|||| ||
+||||= '''[=#HTMLrelated HTML related]''' =||
 || '''`#!html`''' || Insert custom HTML in a wiki page. ||
-|| '''`#!htmlcomment`''' || Insert an HTML comment in a wiki page (''since 0.12''). ||
+|| '''`#!htmlcomment`''' || Insert an HTML comment in a wiki page. (''since 0.12'') ||
 || || 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.  ||
-|| '''`#!div`''' || Wrap an arbitrary Wiki content inside a <div> element (''since 0.11''). ||
-|| '''`#!span`''' || Wrap an arbitrary Wiki content inside a <span> element (''since 0.11''). ||
-|| '''`#!td`''' || Wrap an arbitrary Wiki content inside a <td> element (''since 0.12'') ||
-|| '''`#!th`''' || Wrap an arbitrary Wiki content inside a <th> element (''since 0.12'') ||
-|| '''`#!tr`''' || Can optionally be used for wrapping `#!td` and `#!th` blocks, either for specifying row attributes of better visual grouping (''since 0.12'') ||
+|| '''`#!div`''' || Wrap wiki content inside a <div> element. ||
+|| '''`#!span`''' || Wrap wiki content inside a <span> element. ||
+|| '''`#!td`''' || Wrap wiki content inside a <td> element. (''since 0.12'') ||
+|| '''`#!th`''' || Wrap wiki content inside a <th> element. (''since 0.12'') ||
+|| '''`#!tr`''' || Can optionally be used for wrapping `#!td` and `#!th` blocks, either for specifying row attributes or better visual grouping. (''since 0.12'') ||
+|| '''`#!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'') || 
 || || See WikiHtml for example usage and more details about these processors. ||
 |||| ||
@@ -172 +162 @@
 || '''`#!textile`''' || Supported if [http://cheeseshop.python.org/pypi/textile Textile] is installed. See [http://www.textism.com/tools/textile/ a Textile reference]. ||
 |||| ||
-||||= '''Code Highlighting Support''' =||
-|| '''`#!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. ||
-|||| ||
+||||= '''[=#CodeHighlightingSupport Code Highlighting Support]''' =||
+|| '''`#!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 [http://pygments.org Pygments] for syntax coloring. [[BR]] [[BR]] See TracSyntaxColoring for information about which languages are supported and how to enable support for more languages. ||
+|||| ||
+
+Since 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.
+
+Using the MIME type as processor, it is possible to syntax-highlight the same languages that are supported when browsing source code.
+
 ||||= '''MIME Type Processors''' =||
-|||| Using the MIME type as processor, it is possible to syntax-highlight the same languages that are supported when browsing source code. ||
 {{{#!tr
 {{{#!td
 Some examples:
  {{{
-{{{
-#!text/html
+{{{#!text/html
 <h1>text</h1>
 }}}
@@ -189 +182 @@
 {{{#!td
 The result will be syntax highlighted HTML code:
+ {{{#!text/html
+<h1>text</h1>
+ }}}
+
+The same is valid for all other [TracSyntaxColoring#SyntaxColoringSupport mime types supported].
+}}}
+}}}
+{{{#!td
  {{{
-#!text/html
-<h1>text</h1>
- }}}
-
-The same is valid for all other [TracSyntaxColoring#SyntaxColoringSupport mime types supported].
-}}}
-}}}
-{{{#!td
- {{{
-{{{
-#!diff
+{{{#!diff
 --- Version 55
 +++ Version 56
@@ -221 +212 @@
 {{{#!td
 '''`#!diff`''' has a particularly nice renderer:
- {{{
-#!diff
+ {{{#!diff
 --- Version 55
 +++ Version 56
@@ -241 +231 @@
 }}}
 
-For more processor macros developed and/or contributed by users, visit: 
- * [trac:ProcessorBazaar]
- * [trac:MacroBazaar]
- * [http://trac-hacks.org Trac Hacks] community site
-
-Developing 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.
-
+Line numbers can be added to code blocks and lines can be highlighted //(since 1.1.2)//.
+{{{
+{{{#!python lineno=3 marks=3,9-10,16
+def expand_markup(stream, ctxt=None):
+    """A Genshi stream filter for expanding `genshi.Markup` events.
+
+    Note: Expansion may not be possible if the fragment is badly
+    formed, or partial.
+    """
+    for event in stream:
+        if isinstance(event[1], Markup):
+            try:
+                for subevent in HTML(event[1]):
+                    yield subevent
+            except ParseError:
+                yield event
+        else:
+            yield event
+}}}
+}}}
+{{{#!python lineno=3 marks=3,9-10,16
+def expand_markup(stream, ctxt=None):
+    """A Genshi stream filter for expanding `genshi.Markup` events.
+
+    Note: Expansion may not be possible if the fragment is badly
+    formed, or partial.
+    """
+    for event in stream:
+        if isinstance(event[1], Markup):
+            try:
+                for subevent in HTML(event[1]):
+                    yield subevent
+            except ParseError:
+                yield event
+        else:
+            yield event
+}}}
+
+For more processor macros developed and/or contributed by users, visit the [https://trac-hacks.org Trac Hacks] community site.
+
+Developing 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.
 
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