Re: fmt2.myr: Landed new string formatting code.

[Ryan Gonzalez <rymg19@xxxxxxxxx>]

Looks neat! One thing: it seems weird to specify a percent *and* the braces. Python uses no percent with the .format function; it's just the braces.

I can test it on Plan 9 once I can figure out how to "git pull" with an rc script I found...

Curiosity: how to you commit changes to the repo from Plan 9?


On June 7, 2015 11:57:10 AM CDT, Ori Bernstein <ori@xxxxxxxxxxxxxx> wrote:
>I've got a new version of std.fmt() which uses the generated type info
>to know the types of its arguments, and which can support custom format
>functions.
>
>Format strings are now very different. '%' is the value placeholder.
>There are no other specifiers. Formatting options are passed via the
>'{opts}' after the placeholder. '%%' escapes the '%', so that a single
>'%' is printed. {} is the empty parameter list, and needs to be passed
>if you are printing a { immediately after a placeholder. Examples:
>
>    std.f2put("x=%\n", 123)
>        prints "x=123"
>
>    std.f2put("x=%{x}\n", 255)
>        prints "x=ff"
>
>    std.f2put("x=%{}{asdf}\n", 123)
>        prints "x=123{asdf}"
>
>    std.f2put("x=%, %\n", 255)
>        Kills your program because your arg list doesn't match the
>        format string (there are too few args)
>
>    std.f2put("x=%\n", 123, 456)
>        Kills your program because your arg list doesn't match the
>        format string (there are too many args)
>
>
>It hasn't replaced std.fmt() yet, and is accessible via the f2fmt()
>functions, but I intend to kill off the current std.fmt as soon as
>I verify that this is working well on plan9.
>
>Code is here:
>    http://git.eigenstate.org/ori/mc.git/tree/libstd/fmt2.myr
>
>It depends on the new type introspection api:
>    http://git.eigenstate.org/ori/mc.git/tree/libstd/introspect.myr
>
>API design reviews would be welcome. I'm not sure how happy I am
>with the introspection API, although I do like that it lets me
>look at stuff without descending into it, and without needing any
>heap allocations.
>
>-- 
>Ori Bernstein <ori@xxxxxxxxxxxxxx>

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