djedr

This was originally a short reply to a toot by @[email protected], but it kinda grew.

Let me first quote the original toot:

Interesting difference when creating #JavaScript numbers:

Before number literals, plus and minus are unary operators (that coerce to number) and not part of the literal: https://tc39.es/ecma262/#sec-literals-numeric-literals

> +5 >

djedr

This gist expands on this Hacker News reply.

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The official Jevko spec is meant to be fully generic, but in fact if you don't care about that then you can use this simplifed grammar to start (ABNF + RegExp):

tree = *sub text
sub  = text '[' tree ']'
text = /[^\[\]]*/