Bike: Outline Path Implementation

Bike Outliner
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This post is for Swift developers interested in the implementation details of Bike’s outline paths. It’s inspired by Swift Blog Carnival: Tiny Languages.

This is a companion discussion topic for the original entry at https://www.hogbaysoftware.com/posts/bike-outline-path-implementation
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Questions/Suggestions welcome. I’m not sure if the Claude Code extraction is enough to get you started with syntax highlight, but it seems to work pretty well in practice. I can provide more details if you get far enough to need them.

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Is there anywhere that we can look for details of the regular expression idiom that works with the matches keyword ?

( I haven’t yet figured out how to match word boundaries or white space – I don’t think that \b or \s, for example, seem to be available ?)

UPDATE

Got it. We just need a doubled backslash, at least in ordinary filtering …

//@text matches "\\bsum\\b"

but perhaps style-sheet path matching has slightly different requirements ?

This matches and applies a style as expected (assumes only one class name in @classes)

row(`.@classes matches "^term$"`, (_, row) => {
  row.text.color = Color.systemRed();
})

but neither of these seem to (\b or \\b)

row(`.@classes matches "\bterm\b"`, (_, row) => {
    row.text.color = Color.systemRed();
})

row(`.@classes matches "\\bterm\\b"`, (_, row) => {
    row.text.color = Color.systemRed();
})
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I think this can be cleaned up some on Bike’s side, but for now just keep adding escapes, or use String.raw for paths in stylesheets. I think either of these should work:

row(`.@classes matches "\\\\bterm\\\\b"`, (_, row) => {
  row.text.color = Color.systemRed();
})

row(String.raw`.@classes matches "\\bterm\\b"`, (_, row) => {
  row.text.color = Color.systemRed();
})

The issue is that we want to enter /b for the regex, but we have to go through two layers of escapes. I am parsing the "" as a JSON string, and that means need to escape once. And then when the outline path is in a stylesheet (which is javascript), that adds another level of escaping.

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Thanks !

I shouldn’t have given up at 3 …   :slight_smile:

( 貴在堅持 – persistence unlocks most things )

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Also, currently Bike outline path predicates have modifies i s n d. For case insensitive, sensitive, numeric, and date. TaskPaper also had l for list, and it was partially implemented in Bike, but not fully. I’m implementing that for next release. Which would allow you to use:

row(`.@classes contains[l] "term"`, (_, row) => {
  row.text.color = Color.systemRed();
})

Edit Also realizing that [d] was only implemented in parser, not evaluator. Fixing that too…

1 Like
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Perfect. Thanks !