This implements a format for searching texts with the following grammar:

Quotkey:
    " any string without `"` "
QuotkeySeq:
    (Quotkey \s*)? Quotkey
Fuzykey:
    nonempty trimed string which is not Set, has no white spaces, has no `"` pair
FuzykeySeq:
    (Fuzykey \s+)? Fuzykey
Key:
    (QuotkeySeq | FuzykeySeq)+
Rel:
    (Key | \?) \s* > \s* (Key | \?) \s* > \s* (Key | \?)
Substract:
    Set \s* \ \s* Set
Intersect:
    Set \s* ∩ \s* Set
Union:
    Set \s* ∪ \s* Set
UnparenthesizedSet:
    Intersect | Substract | Union | Rel | Key
ParenthesizedSet: 
    \( \s* UnparenthesizedSet \s* \)
Set:
    UnparenthesizedSet | PparenthesizedSet

For example, searching videos about TypeScript or JavaScript unrelated to Deno can be

video > contain > ? ∩ (typescript ∪ javascript) \ deno

This uses a compiling mechanism, i.e., compile while editing. It finds the smallest dirty node, and recompiles that node only, reusing unrelated nodes within the dirty node. So it is very efficient for editing.

unittest

cd /path_to/set.ts/src/test
deno test --allow-read --allow-net

Known issue

Using Deno 2.0.0 causes "segmentation fault" in one-line error message! (#25192)

Downgrading to 1.45.5 (deno upgrade --version 1.45.5) works fine.