On Thursday, June 25, 2020 at 6:21:00 AM UTC-7, OGNSYA wrote:
>
> Just so I can learn with my mistakes, what was wrong about my thinking
> when I did this\?:
> {{{{!!sourcename}}!!myfield}}
>
You can't nest syntax (i.e, using transclusion syntax *inside* of
transclusion syntax)
This is, in part, because the TiddlyWiki language is *interpreted* in
real-time rather than "compiled" ahead of time,
and the parser is based on linear pattern recognition using "regular
expressions" (regexp) rather than a recursive algorithm.
If the TWCore used recursion, then the overhead for processing the syntax
would rapidly overwhelm the performance
for example, you can't embed a macro inside another macro
<<something param:<<somethingelse>> >>
and you can't use widgets inside of a widget parameter
<$somewidget param=<$someotherwidget ... />
and you can't mix TW macro syntax *inside* a parameter value
<$somewidget param="some <<macro>> text" />
Note that you CAN use a macro as a *whole* widget parameter:
<$somewidget param1="some text" param2=<<somemacro ...>> />
You can also use an "inline filter" as a *whole* widget parameter:
<$somewidget param={{{ [...somefilter...] }}} />
This also applies to HTML syntax, where you can use macros as parameter
values:
<div class=<<somemacro>> style=<<someothermacro>>>...</div>
but you can't write this:
<div class=<<somemacro>> style="color:<<someothermacro>>" >...</div>
However, there are some interesting techniques for getting around the
problem. For example,
<div class=<<somemacro>> style={{{ [[color:]addsuffix<somevariable>] }}}"
>...</div>
uses an inline filter to assemble the full style=... CSS syntax by
appending a <variable> value to some literal CSS syntax
I know this seems very confusing, but it is *consistent*, even if it's not
*conventional*...
-e
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