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package Apache::Config::Preproc::locus;
use parent 'Apache::Config::Preproc::Expand';
use strict;
use warnings;
use Text::Locus;
our $VERSION = '1.03';
sub new {
my $class = shift;
my $self = bless $class->SUPER::new(@_), $class;
$self->{filename} = $self->conf->filename;
$self->{line} = 0;
$self->{context} = [];
return $self;
}
sub filename { shift->{filename} }
sub context_push {
my ($self,$file) = @_;
push @{$self->{context}}, [ $self->filename, $self->{line} ];
$self->{filename} = $file;
$self->{line} = 0;
}
sub context_pop {
my $self = shift;
if (my $ctx = pop @{$self->{context}}) {
($self->{filename}, $self->{line}) = @$ctx;
}
}
sub expand {
my ($self, $d, $repl) = @_;
# Prevent recursion
return 0 if $d->can('locus');
# Handle context switches due to include statements.
if ($d->type eq 'directive') {
if ($d->name eq '$PUSH$') {
if ($d->value =~ /^\"(.+)\"/) {
$self->context_push($1);
return 0;
}
} elsif ($d->name eq '$POP$') {
$self->context_pop();
return 0;
}
}
# Compute and attach a locus object.
$self->{line}++;
my $locus = new Text::Locus($self->filename, $self->{line});
if ($d->type eq 'section') {
$self->lpush($locus);
} elsif ($d->type eq 'directive') {
if ((my $nl = ($d->{raw}) =~ tr/\n//) > 1) {
my $l = $self->{line}+1;
$self->{line} += $nl-1;
$locus->add($self->filename, ($l..$self->{line}));
}
} elsif ($d->type eq 'blank') {
if ($d->{length} > 1) {
my $l = $self->{line}+1;
$self->{line} += $d->{length}-1;
$locus->add($self->filename, ($l..$self->{line}));
}
} elsif ($d->type eq 'comment') {
if (my $nl = ($d->value//'') =~ tr/\n//) {
my $l = $self->{line}+1;
$self->{line} += $nl;
$locus->add($self->filename, ($l..$self->{line}));
}
}
push @$repl, Apache::Config::Preproc::locus::node->derive($d, $locus);
return 1;
}
sub lpush {
my ($self,$locus) = @_;
push @{$self->{postprocess}}, $locus;
}
sub lpop {
my ($self) = @_;
pop @{$self->{postprocess}}
}
sub lcheck {
my ($self, $item) = @_;
if ($self->{postprocess} && @{$self->{postprocess}}) {
return ${$self->{postprocess}}[$#{$self->{postprocess}}]->format eq $item->locus->format;
}
}
sub end_section {
my ($self, $d) = @_;
if ($self->lcheck($d)) {
$self->lpop;
$self->{line}++;
if (my @lines = $d->locus->filelines($self->filename)) {
$d->locus->add($self->filename, (pop(@lines)+1..$self->{line}));
}
}
}
package Apache::Config::Preproc::locus::node;
use Apache::Admin::Config;
our @ISA = qw(Apache::Admin::Config::Tree);
sub derive {
my ($class, $orig, $locus) = @_;
my $self = bless $orig->clone;
$self->{_locus} = $locus;
return $self;
}
sub locus { shift->{_locus} }
sub clone {
my ($self) = @_;
my $clone = bless $self->SUPER::clone;
$clone->{_locus} = $clone->{_locus}->clone();
return $clone;
}
1;
__END__
=head1 NAME
Apache::Config::Preproc::locus - attach file location to each parse node
=head1 SYNOPSIS
$x = new Apache::Config::Preproc '/path/to/httpd.conf',
-expand => [ qw(locus) ];
foreach ($x->select) {
print $_->locus
}
=head1 DESCRIPTION
B<Locus> attaches to each node in the parse tree a B<Text::Locus> object
which describes the location of the corresponding statement in the source
file. The location of a node can be accessed via the B<locus> method
as illustrated in the synopsis.
Technically speaking, this module replaces each instance of
B<Apache::Admin::Config::Tree> in the parse tree with an instance of its
derived class B<Apache::Config::Preproc::locus::node>, which provides the
B<locus> accessor.
=head1 SEE ALSO
L<Apache::Config::Preproc>
L<Text::Locus>
=cut
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