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Subject: Re: Help with associative arrays
From: =?utf-8?Q?Lawrence_Vel=C3=A1zquez?= <vq@larryv.me>
In-Reply-To: <CACeGjnUfMEo5KtdMn=iiAVsfAJgjeVyk7vh+WFZgcyKeahBbnQ@mail.gmail.com>
Date: Sun, 21 Aug 2016 17:18:11 -0400
Cc: zsh-workers@zsh.org
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Message-Id: <2D3937A2-41B0-4B31-90D9-3C91D0DFFB92@larryv.me>
References: <CACeGjnUfMEo5KtdMn=iiAVsfAJgjeVyk7vh+WFZgcyKeahBbnQ@mail.gmail.com>
To: acs@alumni.princeton.edu,
 ethersoft@gmail.com

> On Aug 21, 2016, at 4:50 PM, Vin Shelton <ethersoft@gmail.com> wrote:
>=20
> I can't seem to figure this out.  I'm trying to use an associative
> array and the results are not what I expect:
>=20
> #!/usr/bin/env zsh
>=20
> emulate -LR zsh
>=20
> typeset -A repos
> repos["conky"]=3D"https://github.com/brndnmtthws/conky.git"
>=20
> nickname=3D"conky"
> echo "nickname =3D " \"$nickname\" "repos =3D " =
\"${repos[$nickname]}\"
> echo "nickname =3D " \"$nickname\" "repos =3D " \"${repos["conky"]}\"
>=20
> yileds:
>=20
> nickname =3D  "conky" repos =3D  ""
> nickname =3D  "conky" repos =3D  =
"https://github.com/brndnmtthws/conky.git"
>=20
> given that nickname is "conky" I expected the values to be the same.

=46rom zshparam(1):

        The basic rule to remember when writing a subscript expression
        is that all text between the opening `[' and the closing `]' is
        interpreted as if it were in double quotes (see zshmisc(1)).

        [...]

        The second difference is that a double-quote (`"') may appear as
        part of a subscript expression without being preceded by
        a backslash....

The double quotes you're using are not acting as quoting syntax; they
are being treated literally and are becoming part of the key itself.

	% typeset -A repos1; repos1["conky"]=3Dfoo; typeset repos1
	repos1=3D( '"conky"' foo )
	% typeset -A repos2; repos2[conky]=3Dfoo; typeset repos2
	repos2=3D( conky foo )

But the quotes are behaving as you expect when you do the assignment to
"nickname".

	% nickname=3D"conky"; typeset nickname
	nickname=3Dconky

So $repos[$nickname] is evaluated as $repos[conky], not $repos["conky"],
while your array contains a '"conky"' key, not a 'conky' key. In the
end, you're not looking up the key you want.

tl;dr: Don't use double quotes in array subscripts, unless your array
contains keys with literal double quotes.

vq