shirleyquirk 0bc943ad54
followup strformat PR. backslash escapes, tests, docs ( #17700 ) ...
* Allow use of colons inside fmt
allowing colons inside fmt by replacing the format specifier delimiter lets arbitrary nim code be run within fmt expressions.
Co-authored-by: flywind <xzsflywind@gmail.com >
* formatting,documentation,backslash escapes
Adding support for evaluating expressions by special-casing parentheses causes this regression: `&"""{ "(hello)" }"""` no longer parses.
In addition, code such as &"""{(if open: '(' else: ')')}""" wouldn't work.
To enable that, as well as the use of, e.g. Table constructors inside curlies, I've added backslash escapes.
This also means that if/for/etc statements, unparenthesized, will work, if the colons are escaped, but i've left that under-documented.
It's not exactly elegant having two types of escape, but I believe it's the least bad option.
* changelog
* added json strformat test
* pulled my thumb out and wrote a parser
Co-authored-by: Andreas Rumpf <rumpf_a@web.de >
Co-authored-by: flywind <xzsflywind@gmail.com >
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