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|
package Catmandu::Path::simple;
use Catmandu::Sane;
our $VERSION = '1.2024';
use Catmandu::Util
qw(is_hash_ref is_array_ref is_value is_natural is_code_ref trim);
use Moo;
use namespace::clean;
with 'Catmandu::Path', 'Catmandu::Emit';
use overload '""' => sub {$_[0]->path};
sub split_path {
my ($self) = @_;
my $path = $self->path;
if (is_value($path)) {
$path = trim($path);
$path =~ s/^\$[\.\/]//;
$path = [map {s/\\(?=[\.\/])//g; $_} split /(?<!\\)[\.\/]/, $path];
return $path;
}
if (is_array_ref($path)) {
return $path;
}
Catmandu::Error->throw("path should be a string or arrayref of strings");
}
sub getter {
my ($self) = @_;
my $path = $self->split_path;
my $data_var = $self->_generate_var;
my $vals_var = $self->_generate_var;
my $body = $self->_emit_declare_vars($vals_var, '[]') . $self->_emit_get(
$data_var,
$path,
sub {
my ($var, %opts) = @_;
# looping goes backwards to keep deletions safe
"unshift(\@{${vals_var}}, ${var});";
},
) . "return ${vals_var};";
$self->_eval_sub($body, args => [$data_var]);
}
sub setter {
my $self = shift;
my %opts = @_ == 1 ? (value => $_[0]) : @_;
my $path = $self->split_path;
my $key = pop @$path;
my $data_var = $self->_generate_var;
my $val_var = $self->_generate_var;
my $captures = {};
my $args = [$data_var];
my $body = $self->_emit_get(
$data_var,
$path,
sub {
my $var = $_[0];
my $val;
if (is_code_ref($opts{value})) {
$captures->{$val_var} = $opts{value};
$val = "${val_var}->(${var}, ${data_var})";
}
elsif (exists $opts{value}) {
$captures->{$val_var} = $opts{value};
$val = $val_var;
}
else {
push @$args, $val_var;
$val
= "is_code_ref(${val_var}) ? ${val_var}->(${var}, ${data_var}) : ${val_var}";
}
$self->_emit_set_key($var, $key, $val);
},
) . "return ${data_var};";
$self->_eval_sub($body, args => $args, captures => $captures);
}
sub updater {
my ($self, %opts) = @_;
my $path = $self->split_path;
my $data_var = $self->_generate_var;
my $captures = {};
my $args = [$data_var];
my $cb;
if (my $tests = $opts{if}) {
$cb = sub {
my ($var, %opts) = @_;
my $perl = "";
for (my $i = 0; $i < @$tests; $i += 2) {
my $test = $tests->[$i];
my $val = $tests->[$i + 1];
my $test_var = $self->_generate_var;
my $val_var = $self->_generate_var;
$captures->{$test_var} = $test;
$captures->{$val_var} = $val;
if ($i) {
$perl .= 'els';
}
$perl
.= "if (List::Util::any {\$_->(${var})} \@{${test_var}}) {"
. $self->_emit_assign_cb($var, $val_var, %opts) . '}';
}
$perl;
};
}
else {
my $val_var = $self->_generate_var;
if (my $val = $opts{value}) {
$captures->{$val_var} = $val;
}
else {
push @$args, $val_var;
}
$cb = sub {
my ($var, %opts) = @_;
$self->_emit_assign_cb($var, $val_var, %opts);
};
}
my $body
= $self->_emit_get($data_var, $path, $cb) . "return ${data_var};";
$self->_eval_sub($body, args => $args, captures => $captures);
}
sub creator {
my ($self, %opts) = @_;
my $path = $self->split_path;
my $data_var = $self->_generate_var;
my $val_var = $self->_generate_var;
my $captures = {};
my $args = [$data_var];
my $cb;
if (is_code_ref($opts{value})) {
$captures->{$val_var} = $opts{value};
$cb = sub {
my $var = $_[0];
"${var} = ${val_var}->(${var}, ${data_var});";
};
}
elsif (exists $opts{value}) {
$captures->{$val_var} = $opts{value};
$cb = sub {
my $var = $_[0];
"${var} = ${val_var};";
};
}
else {
push @$args, $val_var;
$cb = sub {
my $var = $_[0];
"if (is_code_ref(${val_var})) {"
. "${var} = ${val_var}->(${var}, ${data_var});"
. '} else {'
. "${var} = ${val_var};" . '}';
};
}
my $body = $self->_emit_create_path($data_var, $path, $cb);
$body .= "return ${data_var};";
$self->_eval_sub($body, args => $args, captures => $captures);
}
sub deleter {
my ($self) = @_;
my $path = $self->split_path;
my $key = pop @$path;
my $data_var = $self->_generate_var;
my $body = $self->_emit_get(
$data_var,
$path,
sub {
my $var = $_[0];
$self->_emit_delete_key($var, $key);
}
) . "return ${data_var};";
$self->_eval_sub($body, args => [$data_var]);
}
sub _emit_get {
my ($self, $var, $path, $cb, %opts) = @_;
@$path || return $cb->($var, %opts);
$path = [@$path];
my $key = shift @$path;
my $str_key = $self->_emit_string($self->unquote($key));
my $perl = "";
%opts = (up_var => my $up_var = $var);
$var = $self->_generate_var;
if (is_natural($key)) {
$perl
.= "if (is_hash_ref(${up_var}) && exists(${up_var}->{${str_key}})) {";
$perl .= "my ${var} = ${up_var}->{${str_key}};";
$perl .= $self->_emit_get($var, $path, $cb, %opts, key => $str_key);
$perl
.= "} elsif (is_array_ref(${up_var}) && \@{${up_var}} > ${key}) {";
$perl .= "my ${var} = ${up_var}->[${key}];";
$perl .= $self->_emit_get($var, $path, $cb, %opts, index => $key);
$perl .= "}";
}
elsif ($key eq '*') {
$perl .= "if (is_array_ref(${up_var})) {";
$perl .= $self->_emit_iterate_array(
$up_var,
sub {
my ($v, %opts) = @_;
"my ${var} = ${v};"
. $self->_emit_get($var, $path, $cb, %opts);
}
);
$perl .= "}";
}
else {
if ($key eq '$first') {
$opts{index} = 0;
$perl .= "if (is_array_ref(${up_var}) && \@{${up_var}}) {";
$perl .= "my ${var} = ${up_var}->[0];";
}
elsif ($key eq '$last') {
$opts{index} = my $i = $self->_generate_var;
$perl .= "if (is_array_ref(${up_var}) && \@{${up_var}}) {";
$perl .= $self->_emit_declare_vars($i, "\@{${up_var}} - 1");
$perl .= "my ${var} = ${up_var}->[${i}];";
}
else {
$opts{key} = $str_key;
$perl
.= "if (is_hash_ref(${up_var}) && exists(${up_var}->{${str_key}})) {";
$perl .= "my ${var} = ${up_var}->{${str_key}};";
}
$perl .= $self->_emit_get($var, $path, $cb, %opts);
$perl .= "}";
}
$perl;
}
sub _emit_set_key {
my ($self, $var, $key, $val) = @_;
return "${var} = $val;" unless defined $key;
my $perl = "";
my $str_key = $self->_emit_string($self->unquote($key));
if (is_natural($key)) {
$perl .= "if (is_hash_ref(${var})) {";
$perl .= "${var}->{${str_key}} = $val;";
$perl .= "} elsif (is_array_ref(${var})) {";
$perl .= "${var}->[${key}] = $val;";
$perl .= "}";
}
elsif ($key eq '$first') {
$perl .= "if (is_array_ref(${var})) {";
$perl .= "${var}->[0] = $val;";
$perl .= "}";
}
elsif ($key eq '$last') {
$perl .= "if (is_array_ref(${var})) {";
$perl .= "${var}->[\@{${var}} - 1] = $val;";
$perl .= "}";
}
elsif ($key eq '$prepend') {
$perl .= "if (is_array_ref(${var})) {";
$perl .= "unshift(\@{${var}}, $val);";
$perl .= "}";
}
elsif ($key eq '$append') {
$perl .= "if (is_array_ref(${var})) {";
$perl .= "push(\@{${var}}, $val);";
$perl .= "}";
}
elsif ($key eq '*') {
my $i = $self->_generate_var;
$perl .= "if (is_array_ref(${var})) {";
$perl .= "for (my ${i} = 0; ${i} < \@{${var}}; ${i}++) {";
$perl .= "${var}->[${i}] = $val;";
$perl .= "}}";
}
else {
$perl .= "if (is_hash_ref(${var})) {";
$perl .= "${var}->{${str_key}} = $val;";
$perl .= "}";
}
$perl;
}
sub _emit_create_path {
my ($self, $var, $path, $cb) = @_;
@$path || return $cb->($var);
my $key = shift @$path;
my $str_key = $self->_emit_string($self->unquote($key));
my $perl = "";
if (is_natural($key)) {
my $v1 = $self->_generate_var;
my $v2 = $self->_generate_var;
$perl .= "if (is_hash_ref(${var})) {";
$perl .= "my ${v1} = ${var};";
$perl
.= $self->_emit_create_path("${v1}->{${str_key}}", [@$path], $cb);
$perl .= "} elsif (is_maybe_array_ref(${var})) {";
$perl .= "my ${v2} = ${var} //= [];";
$perl .= $self->_emit_create_path("${v2}->[${key}]", [@$path], $cb);
$perl .= "}";
}
elsif ($key eq '*') {
my $v1 = $self->_generate_var;
my $v2 = $self->_generate_var;
$perl .= "if (is_array_ref(${var})) {";
$perl .= "my ${v1} = ${var};";
# loop backwards so that deletions are safe
$perl .= "for (my ${v2} = \@{${v1}} - 1; $v2 >= 0; ${v2}--) {";
$perl .= $self->_emit_create_path("${v1}->[${v2}]", $path, $cb);
$perl .= "}";
$perl .= "}";
}
else {
my $v = $self->_generate_var;
if ( $key eq '$first'
|| $key eq '$last'
|| $key eq '$prepend'
|| $key eq '$append')
{
$perl .= "if (is_maybe_array_ref(${var})) {";
$perl .= "my ${v} = ${var} //= [];";
if ($key eq '$first') {
$perl .= $self->_emit_create_path("${v}->[0]", $path, $cb);
}
elsif ($key eq '$last') {
$perl .= "if (\@${v}) {";
$perl .= $self->_emit_create_path("${v}->[\@${v} - 1]",
[@$path], $cb);
$perl .= "} else {";
$perl .= $self->_emit_create_path("${v}->[0]", [@$path], $cb);
$perl .= "}";
}
elsif ($key eq '$prepend') {
$perl .= "if (\@${v}) {";
$perl .= "unshift(\@${v}, undef);";
$perl .= "}";
$perl .= $self->_emit_create_path("${v}->[0]", $path, $cb);
}
elsif ($key eq '$append') {
my $index_var = $self->_generate_var;
$perl
.= $self->_emit_declare_vars($index_var, "scalar(\@${v})")
. $self->_emit_create_path("${v}->[${index_var}]", $path,
$cb);
}
$perl .= "}";
}
else {
$perl .= "if (is_maybe_hash_ref(${var})) {";
$perl .= "my ${v} = ${var} //= {};";
$perl
.= $self->_emit_create_path("${v}->{${str_key}}", $path, $cb);
$perl .= "}";
}
}
$perl;
}
sub _emit_delete_key {
my ($self, $var, $key) = @_;
my $str_key = $self->_emit_string($self->unquote($key));
my $perl = "";
if (defined($key) && is_natural($key)) {
$perl .= "if (is_hash_ref(${var}) && exists(${var}->{${str_key}})) {";
$perl .= "delete(${var}->{${str_key}});";
$perl .= "} elsif (is_array_ref(${var}) && \@{${var}} > ${key}) {";
$perl .= "splice(\@{${var}}, ${key}, 1)";
}
elsif (defined($key)
&& ($key eq '$first' || $key eq '$last' || $key eq '*'))
{
$perl .= "if (is_array_ref(${var}) && \@{${var}}) {";
$perl .= "splice(\@{${var}}, 0, 1)" if $key eq '$first';
$perl .= "splice(\@{${var}}, \@{${var}} - 1, 1)" if $key eq '$last';
$perl .= "splice(\@{${var}}, 0, \@{${var}})" if $key eq '*';
}
else {
$perl .= "if (is_hash_ref(${var})) {";
$perl .= "delete(${var}->{${str_key}})";
}
$perl .= ";";
$perl .= "}";
$perl;
}
sub unquote {
my ($self, $str) = @_;
if (!defined $str) {
return $str;
}
elsif ($str =~ /^['](.*)[']$/) {
return $1;
}
elsif ($str =~ /^["](.*)["]$/) {
return $1;
}
else {
return $str;
}
}
1;
__END__
=pod
=head1 NAME
Catmandu::Path::simple - The default Catmandu path syntax
=head1 SYNOPSIS
my $data = {foo => {bar => ['first_bar', 'second_bar']}};
my $path = Catmandu::Path::simple->new("foo.bar.0");
my $getter = $path->getter;
my $first_bar = $getter->($data);
my $updater = $path->updater(sub { my $str = $_[0]; uc $str });
$updater->($data);
# => {foo => {bar => ['FIRST_BAR', 'second_bar']}}
# safer version with a type check
my $updater = $path->updater(if_string => sub { my $str = $_[0]; uc $str });
=head1 CONFIGURATION
=over 4
=item path
The string version of the path. Required.
=back
=head1 METHODS
=head2 getter
Returns a coderef that can get the values for the path.
The coderef takes the data as argument and returns the matching values as an
arrayref.
my $path = Catmandu::Path::Simple->new(path => '$.foo');
my $data = {foo => 'foo', bar => 'bar'};
$path->getter->($data);
# => ['foo']
=head2 setter
Returns a coderef that can create the final part of the path and set it's
value. In contrast to C<creator> this will only set the value if the
intermediate path exists. The coderef takes the data as argument and also
returns the data.
my $path = Catmandu::Path::Simple->new(path => '$.foo.$append');
$path->creator(value => 'foo')->({});
# => {foo => ['foo']}
$path->creator(value => sub { my ($val, $data) = @_; $val // 'foo' })->({});
# => {foo => ['foo']}
# calling creator with no value creates a sub that takes the value as an
# extra argument
$path->creator->({}, 'foo');
$path->creator->({}, sub { my ($val, $data) = @_; $val // 'foo' });
# => {foo => ['foo']}
=head2 setter(\&callback|$value)
This is a shortcut for C<setter(value => \&callback|$value)>.
=head2 updater(value => \&callback)
Returns a coderef that can update the value of an existing path.
=head2 updater(if_* => [\&callback])
TODO
=head2 updater(if => [\&callback])
TODO
=head2 updater(if_* => \&callback)
TODO
=head2 updater(if => \&callback)
TODO
=head2 updater(\&callback)
This is a shortcut for C<updater(value => \&callback|$value)>.
=head2 creator(value => \&callback|$value)
Returns a coderef that can create the path and set it's value. In contrast to
C<setter> this also creates the intermediate path if necessary.
The coderef takes the data as argument and also returns the data.
my $path = Catmandu::Path::Simple->new(path => '$.foo.$append');
$path->creator(value => 'foo')->({});
# => {foo => ['foo']}
$path->creator(value => sub { my ($val, $data) = @_; $val // 'foo' })->({});
# => {foo => ['foo']}
# calling creator with no value creates a sub that takes the value as an
# extra argument
$path->creator->({}, 'foo');
$path->creator->({}, sub { my ($val, $data) = @_; $val // 'foo' });
# => {foo => ['foo']}
=head2 creator(\&callback|$value)
This is a shortcut for C<creator(value => \&callback|$value)>.
=head2 deleter
Returns a coderef that can delete the path.
The coderef takes the data as argument and also returns the data.
my $path = Catmandu::Path::Simple->new(path => '$.foo');
$path->deleter->({foo => 'foo', bar => 'bar'});
# => {bar => 'bar'}
=head1 SEE ALSO
L<Catmandu::Path>.
=cut
|
