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.\"
.IX Title "Catmandu::Fix::SimpleGetValue 3pm"
.TH Catmandu::Fix::SimpleGetValue 3pm "2019-01-29" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Catmandu::Fix::SimpleGetValue \- helper class for creating emit Fix\-es
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    # Create a Rot13 encrypter
\&
\&    package Catmandu::Fix::rot13;
\&
\&    use Catmandu::Sane;
\&    use Moo;
\&    use Catmandu::Fix::Has;
\&
\&    has path => (fix_arg => 1);
\&
\&    with \*(AqCatmandu::Fix::SimpleGetValue\*(Aq;
\&
\&    sub emit_value {
\&        my ($self, $var, $fixer) = @_;
\&        "${var} =~ y/A\-Za\-z/N\-ZA\-Mn\-za\-m/ if is_string(${var});";
\&    }
\&
\&    # Now you can use this Fix in your scripts
\&    rot13(my.deep.nested.path)
\&    rot13(authors.*)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Catmandu::Fix::SimpleGetValue eases the creation of emit Fixes that transform
values on a \s-1JSON\s0 path. A Fix package implementing Catmandu::Fix::SimpleGetValue
needs to implement a method \f(CW\*(C`emit_value\*(C'\fR which accepts the variable name on
which the Fix operates and an instance of Catmandu::Fixer. The method should
return a string containing the Perl code to transform values on a \s-1JSON\s0 path.
.PP
It is not possible to inspect in an emit Fix the actual value on which this Fix
runs: \f(CW$var\fR contains a variable name not the actual value. The real values are
only available at run time. Emit Fixes are used to compile Perl code into Fix
modules which do the actual transformation.
.PP
For more examples look at the source code of:
.IP "Catmandu::Fix::append;" 4
.IX Item "Catmandu::Fix::append;"
.PD 0
.IP "Catmandu::Fix::replace_all" 4
.IX Item "Catmandu::Fix::replace_all"
.IP "Catmandu::Fix::upcase" 4
.IX Item "Catmandu::Fix::upcase"
.PD
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Catmandu::Fix