Thank you Eric!
Very helpful. My emphasis below.
Josiah
@TiddlyTweeter wrote:
>>
>> ... The "bracketing thing" in TW seems unusual... I get confused because
>> it almost behaves as if it were* part *of the "code"...
>>
>
Eric Shulman replied:
> That is a good way to describe it. The bracketing IS part of the code.
> It tells the parser what *type* of reference it contains:
>
> * square brackets contain literal tiddler title references (creates a link)
> * angle brackets contain macro invocations (or variable references)
> * curly braces contain tiddler transclusion references
>
> There are two different contexts in which these brackets occur:
> * in WikiText ("normal content")
> * in filters (i.e., as parameters to widgets or macros)
>
> In WikiText, the brackets are all DOUBLED. This is to avoid confusion
> with other uses that may occur in normal text. In particular, single angle
> brackets are used for normal HTML syntax, so macro invocation uses two
> angle brackets. Similarly, though not as technically required, single
> square brackets and single curly braces are also doubled to avoid mistaken
> parsing of normal text content containing brackets as if they are macros or
> transclusions.
>
> Similar to WikiText, the brackets in filter syntax depend upon the type
> of reference the contain. However, the brackets do not need to be doubled,
> since within the filter there is no potential conflict with other usage.
> Thus:
>
> * SINGLE square brackets contain literal text values
> * SINGLE angle brackets contain macro or variable references
> * SINGLE curly braces contain tiddler transclusion references
>
> Note: filters also use a pair of square brackets to contain separate
> filter expressions, for example:
> filter="[tag[foo]] -[tag[bar]]"
>
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