Difference between revisions of "User:AKAAkira/SimpleNav"

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(Reversed order so pages not in a volume but still ends in a number might end up in the case where their final number is manipulated. Added more tolerance to space after colon.)
m (Forgot to trim extra...)
 
(3 intermediate revisions by the same user not shown)
Line 102: Line 102:
 
}}
  
}}
   
−
<!-- Second guess True: previous volume Afterword page exists -->
 +
<!-- Second guess True: previous volume Afterwords page exists -->
 
| {{!}} Back to [[ {{#replace:
  
| {{!}} Back to [[ {{#replace:
 
<!-- (2a) --> {{FULLPAGENAME}}
  
<!-- (2a) --> {{FULLPAGENAME}}
Line 111: Line 111:
 
<!-- (2b) --> {{#sub: {{FULLPAGENAME}} | {{#pos: {{FULLPAGENAME}} | Volume }} }}
  
<!-- (2b) --> {{#sub: {{FULLPAGENAME}} | {{#pos: {{FULLPAGENAME}} | Volume }} }}
 
<!-- (2c) --> | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} Illustrations
  
<!-- (2c) --> | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} Illustrations
−
<!-- (2d) --> | {{#expr: {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} - 1 }} Afterword
 +
<!-- (2d) --> | {{#expr: {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} - 1 }} Afterwords
 
}}
  
}}
 
}}} }}}
  
}}} }}}
Line 194: Line 194:
   
 
<!-- Fifth guess False: previous volume Epilogue page doesn't exist -->
  
<!-- Fifth guess False: previous volume Epilogue page doesn't exist -->
−
<!-- Sixth guess: the final chapter of last volume is "Illustrations" -->
 +
<!-- First box will not be created -->
−
| {{#ifexist: {{#replace:
  
−  
−
<!-- Replace use #6 -->
  
−  
−
<!-- (6a) --> {{FULLPAGENAME}}
  
−
<!-- (6c) --> | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} Illustrations
  
−
<!-- (6d) --> | {{#expr: {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} - 1 }} Illustrations
  
−
}}
  
−  
−
<!-- Sixth guess True: previous volume Illustrations page exists -->
  
−
| {{!}} Back to [[ {{#replace:
  
−
<!-- (6a) --> {{FULLPAGENAME}}
  
−
<!-- (6b) --> | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} Illustrations
  
−
<!-- (6c) --> | {{#expr: {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} - 1 }} Illustrations
  
−
}} <!--
  
−
-->| {{{bn|{{{backname|{{#replace:
  
−
<!-- (6b) --> {{#sub: {{FULLPAGENAME}} | {{#pos: {{FULLPAGENAME}} | Volume }} }}
  
−
<!-- (6c) --> | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} Illustrations
  
−
<!-- (6d) --> | {{#expr: {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 3 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | {{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }} }} | 0 | 2 }} + 0 }} }} }} - 1 }} Illustrations
  
−
}}
  
−
}}} }}}
  
−
]]
  
−  
−
<!-- Sixth guess False: previous volume Illustrations page doesn't exist -->
  
−
<!-- First box will not be created -->
  
−
}}
  
 
}}
  
}}
 
}}
  
}}
Line 269: Line 243:
 
}}
  
}}
   
−
<!-- Only meant for those pages that end in Chapter x -->
 +
<!-- Only meant for those pages that end in a chapter number -->
−
| {{#ifeq: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }}
 +
| {{#ifeq: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }}
 
| {{{s|{{{startchapter|1 }}} }}}
  
| {{{s|{{{startchapter|1 }}} }}}
   
Line 284: Line 258:
 
| {{#ifexist: {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
  
| {{#ifexist: {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
 
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
  
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
−
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }}
 +
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }}
−
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }} - 1 }}
 +
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }} - 1 }}
 
}}
  
}}
 
| {{!}} Back to [[ {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
  
| {{!}} Back to [[ {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
 
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
  
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
−
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }}
 +
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }}
−
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }} - 1 }}
 +
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }} - 1 }}
 
}} <!--
  
}} <!--
−
-->| {{{bn|{{{backname|Chapter {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }} - 1 }} }}} }}}
 +
-->| {{{bn|{{{backname|Chapter {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }} - 1 }} }}} }}}
 
]]
  
]]
 
}}
  
}}
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<!-- Blank cases defaults their return to the same one as the next case that has one -->
  
<!-- Blank cases defaults their return to the same one as the next case that has one -->
−
<!-- This case is for when the page is on Chapter {{{e}}}; the use of #replace perserves the format
 +
<!-- This case is for when the page is on Chapter {{{e}}}; it checks the last number against {{{e}}},
−
whether there is a space between word "Chapter" and the chapter number or not, as well as being
 +
and if they're the same, it returns Chapter {{{e}}} -->
  +
| {{#ifeq: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }}
−
somewhat lenient if the a word other than "chapter" is being used (e.g. "Story") -->
  
  +
| {{{e|{{{endchapter}}} }}}
−
| {{#if: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }}
  
−
| {{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
 +
| {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
−
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }}
  
−
| {{{e|{{{endchapter}}} }}}
  
−
}}
  
 
| N/A
  
| N/A
 
}}
  
}}
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}}
  
}}
   
−
<!-- Only meant for those pages that end in Chapter x, except Chapter {{{e}}} -->
 +
<!-- Only meant for those pages that end in a chapter number, except Chapter {{{e}}} -->
 
| {{#ifexist: {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
  
| {{#ifexist: {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
 
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
  
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
−
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }}
 +
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }}
−
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }} + 1 }}
 +
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }} + 1 }}
 
}}
  
}}
 
| {{!}} Forward to [[ {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
  
| {{!}} Forward to [[ {{#sub: {{FULLPAGENAME}} | 0 | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }} <!--
 
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
  
-->{{#replace: {{#sub: {{FULLPAGENAME}} | {{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} | }} }}
−
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }}
 +
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }}
−
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }} + 1 }}
 +
| {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }} + 1 }}
 
}} <!--
  
}} <!--
−
-->| {{{fn|{{{forwardname|Chapter {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }} }} + 1 }} }}} }}}
 +
-->| {{{fn|{{{forwardname|Chapter {{#expr: {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }} | {{#sub: {{FULLPAGENAME}} | -1 }} }} + 1 }} }}} }}}
 
]]
  
]]
 
}}
  
}}
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{{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }}
  
{{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }}
−
| {{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -1 }} + 0 }} }}
 +
| {{#sub: {{FULLPAGENAME}} | -1 }}
 
}}
  
}}
 
produces the integer CHAPTER_NUM
  
produces the integer CHAPTER_NUM
−
*returns nothing if chapter number isn't the last thing in FULLPAGENAME
 +
*returns the final character in PAGENAME if chapter number isn't the last thing in FULLPAGENAME
 
*works only if chapter number does not exceed three or more digits
  
*works only if chapter number does not exceed three or more digits
 
</pre>
  
</pre>

Latest revision as of 01:46, 27 May 2014

Return to Main Page


Sandbox page for this template. The real page is at Template:SimpleNav.

TODO:

  • Make it say "Volume" when on Volume page.
  • Make it readable Better than before, at least...
  • Make it easy to tell what the arguments are asking for
  • Insert "beforename" and "aftername"
  • Make it work even if there's something after the volume number aside from the usual (e.g. "Preview")
  • Check whether this still works with * or ' in pagename
  • Make it tolerant to pages with space after colon
  • This thing is case-sensitive...

Edit notes (use a text editor to interchange code with capital letters to improve readability): 

In case of multiple layers of argument defaulting (such as in the case of {{{b|{{{before|}}} }}} ),
it's important to make sure there's no space immediately after the pipe,
or else it may insert an unwanted one (usually right after the page title's colon)

{{#rpos: {{#sub: {{FULLPAGENAME}} | 0 | -3 }} |   }}
produces the zero-based position of SPACE_BEFORE_LAST_WORD
*substring-ing -5 allows it to count out the potential space in "Chapter 1"
*also, it's important to use #rpos and not #pos here since the last space,
 or the first space from the /right/, is being looked for
*returns -1 if there is no space in title (this is the product of using #rpos and not #pos)

{{#sub: {{FULLPAGENAME}} | 0 | {{#pos: {{FULLPAGENAME}} | : }} }}
produces the string SERIES_TITLE
*title should not have a colon in it for this helper function to work
*returns FULLPAGENAME if string ":" doesn't exist in title,
 but /should/ be ignorable since it will return false on #ifexist

{{#sub: {{FULLPAGENAME}} | 0 | {{#pos: {{FULLPAGENAME}} | Volume }} }}
produces the string ALL_BEFORE_VOLUMES_V
*SERIES_TITLE should not have string "Volume" in it for this helper function to work
*SERIES_TITLE is not used because this retains the space after a colon, if there is one
*returns FULLPAGENAME if string "Volume" does not exist in title
 but /should/ be ignorable since this is only used in ifexist cases with colon taken out

{{#sub: {{FULLPAGENAME}} | {{#pos: {{FULLPAGENAME}} | Volume }} }}
produces the string ALL_AFTER_VOLUMES_V

{{#if: {{#pos: {{FULLPAGENAME}} | Volume }} | {{#expr: {{#pos: {{FULLPAGENAME}} | Volume }} +6 }} }}
produces the zero-based position AFTER_VOLUMES_E
*SERIES_TITLE should not have string "Volume" in it for this helper function to work
*returns nothing if "Volume" does not exist in pagename

{{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | AFTER_VOLUMES_E }} | 0 | 3 }} + 0 }}
| {{#iferror: {{#expr: {{#sub: {{#sub: {{FULLPAGENAME}} | AFTER_VOLUMES_E }} | 0 | 2 }} + 0 }} }}
}}
produces the integer VOL_NUMBER
*returns nothing if "volume" does not exist in FULLPAGENAME, or if volume number is not a pure integer
*heavily reliant on the fact that NO VOLUME NUMBER GOES INTO THREE DIGITS
*(kinda hard to search&replace in notepad, break it into two segments, and remember to turn the line breaks into spaces)

{{#sub: {{#sub: {{FULLPAGENAME}} | AFTER_VOLUMES_E }} | {{#len: VOL_NUMBER }} }}
produces the string ALL_AFTER_VOLUME_NUMBER
*including the space immediately after, though this /should/ be ignorable
*returns FULLPAGENAME if "Volume" is not in the FULLPAGENAME
*returns all after Volume's e if volume number is not a pure integer

{{#sub: {{FULLPAGENAME}} | 0 | {{#pos: {{FULLPAGENAME}} | ALL_AFTER_VOLUME_NUMBER }} }}
produces the string ALL_UP_TO_VOLUME_NUMBER
*here, while parsing the space included in ALL_AFTER_VOLUME_NUMBER is /ignored/,
 which means there's a space included right after ALL_UP_TO_VOLUME_NUMBER instead,
 though again this /should/ be ignorable
*returns nothing if "volume" does not exist in FULLPAGENAME
*returns all before Volume's e if volume number is not a pure integer

{{#iferror: {{#expr: {{#sub: {{FULLPAGENAME}} | -2 }} + 0 }}
| {{#sub: {{FULLPAGENAME}} | -1 }}
}}
produces the integer CHAPTER_NUM
*returns the final character in PAGENAME if chapter number isn't the last thing in FULLPAGENAME
*works only if chapter number does not exceed three or more digits
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