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Struct-Path-PerlStyle-0.93
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/ Struct::Path::PerlStyle

NAME

Struct::Path::PerlStyle - Perl-style syntax frontend for Struct::Path.

Travis CI Coverage Status CPAN version

VERSION

Version 0.93

SYNOPSIS

use Struct::Path qw(path);
use Struct::Path::PerlStyle qw(path2str str2path);

my $nested = {
    a => {
        b => ["B0", "B1", "B2"],
        c => ["C0", "C1"],
        d => {},
    },
};

my @found = path($nested, str2path('{a}{}[0,2]'), deref => 1, paths => 1);

while (@found) {
    my $path = shift @found;
    my $data = shift @found;

    print "path '" . path2str($path) . "' refer to '$data'\n";
}

# path '{a}{b}[0]' refer to 'B0'
# path '{a}{b}[2]' refer to 'B2'
# path '{a}{c}[0]' refer to 'C0'

EXPORT

Nothing is exported by default.

PATH SYNTAX

Path is a sequence of 'steps', each represents nested level in the structure.

Hashes

Like in perl hash keys should be specified using curly brackets

{}                  # all values from a's subhash
{foo}               # value for 'foo' key
{foo,bar}           # slicing: 'foo' and 'bar' values
{"space inside"}    # key must be quoted unless it is a simple word
{"multi\nline"}     # special characters interpolated when double quoted
{/pattern/mods}     # keys regexp match

Arrays

Square brackets used for array indexes specification

[]                  # all array items
[9]                 # 9-th element
[0,1,2,5]           # slicing: 0, 1, 2 and 5 array items
[0..2,5]            # same, but using ranges
[9..0]              # descending ranges allowed

Hooks

Expressions enclosed in parenthesis treated as hooks and evaluated using Safe compartment. Almost all perl operators and core functions available, see Safe for more info. Some path related functions provided by Struct::Path::PerlStyle::Functions.

[](/pattern/mods)           # match array values by regular expression
[]{foo}(eq "bar" && BACK)   # select hashes which have pair 'foo' => 'bar'

There are two global variables available whithin safe compartment: $_ which refers to value and %_ which provides current path via key path (in Struct::Path notation) and structure levels refs stack via key refs.

Aliases

String in angle brackets is an alias - shortcut mapped into sequence of steps. Aliases resolved iteratively, so alias may also refer into path with another aliases.

Aliases may be defined via global variable

$Struct::Path::PerlStyle::ALIASES = {
    foo => '{some}{long}{path}',
    bar => '{and}{few}{steps}{more}'
};

and then

<foo><bar>      # expands to '{some}{long}{path}{and}{few}{steps}{more}'

or as option for str2path:

str2path('<foo>', {aliases => {foo => '{long}{path}'}});

SUBROUTINES

str2path

Convert perl-style string to Struct::Path path structure

$struct = str2path($string);

path2str

Convert Struct::Path path structure to perl-style string

$string = path2str($struct);

AUTHOR

Michael Samoglyadov, <mixas at cpan.org>

BUGS

Please report any bugs or feature requests to bug-struct-path-perlstyle at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Struct-Path-PerlStyle. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc Struct::Path::PerlStyle

You can also look for information at:

SEE ALSO

Struct::Path, Struct::Path::JsonPointer, Struct::Diff perldsc, perldata, Safe

LICENSE AND COPYRIGHT

Copyright 2016-2019 Michael Samoglyadov.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.