File Coverage

blib/lib/XML/Grammar/FictionBase/FromProto/Parser/LineIterator.pm

Criterion	Covered	Total	%
statement	55	85	64.7
branch	4	12	33.3
condition	3	6	50.0
subroutine	15	21	71.4
pod	15	15	100.0
total	92	139	66.1

package XML::Grammar::FictionBase::FromProto::Parser::LineIterator;

use strict;
use warnings;

use MooX 'late';

use XML::Grammar::Fiction::Err;

extends("XML::Grammar::Fiction::FromProto::Parser");

has "_curr_line_idx" => (isa => "Int", is => "rw", reader => "line_idx",);
has "_lines" => (isa => "ArrayRef", is => "rw");


our $VERSION = 'v0.14.12';


sub setup_text
{
    my ($self, $text) = @_;

    # We include the lines trailing newlines for safety.
    $self->_lines([split(/^/, $text)]);

    $self->_curr_line_idx(0);

    ${$self->curr_line_ref()} =~ m{\A}g;

    return;
}


sub curr_line_ref
{
    my $self = shift;

    return \($self->_lines()->[$self->_curr_line_idx()]);
}


sub curr_pos
{
    my $self = shift;

    return pos(${$self->curr_line_ref()});
}


sub at_line_start
{
    my $self = shift;

    return ($self->curr_pos == 0);
}


sub curr_line_and_pos
{
    my $self = shift;

    return ($self->curr_line_ref(), $self->curr_pos());
}


sub curr_line_copy
{
    my $self = shift;

    my $l = ${$self->curr_line_ref()} . "";

    pos($l) = $self->curr_pos();

    return \$l;
}


sub next_line_ref
{
    my $self = shift;

    $self->_curr_line_idx($self->_curr_line_idx()+1);

    if (! $self->eof() ) {
        pos(${$self->curr_line_ref()}) = 0;
    }

    return $self->curr_line_ref();
}


# Skip the whitespace.
sub skip_space
{
    my $self = shift;

    $self->consume(qr{[ \t]});

    return;
}


sub skip_multiline_space
{
    my $self = shift;

    if (${$self->curr_line_ref()} =~ m{\G.*?\S})
    {
        return;
    }

    $self->consume(qr{\s});

    return;
}


sub curr_line_continues_with
{
    my ($self, $re) = @_;

    my $l = $self->curr_line_ref();

    return $$l =~ m{\G$re}cg;
}


sub line_num
{
    my $self = shift;

    return $self->_curr_line_idx()+1;
}


sub _next_line_ref_wo_leading_space
{
    my $self = shift;

    my $l = $self->next_line_ref();

    if (defined($$l))
    {
        $self->_check_if_line_starts_with_whitespace()
    }

    return $l;
}

sub consume
{
    my ($self, $match_regex) = @_;

    my $return_value = "";
    my $l = $self->curr_line_ref();

    while (defined($$l) && ($$l =~ m[\G(${match_regex}*)\z]cgms))
    {
        $return_value .= $$l;
    }
    continue
    {
        $l = $self->_next_line_ref_wo_leading_space();
    }

    if (defined($$l) && ($$l =~ m[\G(${match_regex}*)]cg))
    {
        $return_value .= $1;
    }

    return $return_value;
}


# TODO : copied and pasted from _consume - abstract
sub consume_up_to
{
    my ($self, $match_regex) = @_;

    my $return_value = "";
    my $l = $self->curr_line_ref();

    LINE_LOOP:
    while (defined($$l))
    {
        # We assign to a scalar for scalar context, but we're not making
        # use of the variable.
        my $verdict = ($$l =~ m[\G(.*?)((?:${match_regex})|\z)]cgms);
        $return_value .= $1;

        # Find if it matched the regex.
        if (length($2) > 0)
        {
            last LINE_LOOP;
        }
    }
    continue
    {
        $l = $self->_next_line_ref_wo_leading_space();
    }

    return $return_value;
}


sub throw_text_error
{
    my ($self, $error_class, $text) = @_;

    return $error_class->throw(
        error => $text,
        line => $self->line_num(),
    );
}


sub _check_if_line_starts_with_whitespace
{
    my $self = shift;

    if (${$self->curr_line_ref()} =~ m{\A[ \t]})
    {
        $self->throw_text_error(
            'XML::Grammar::Fiction::Err::Parse::LeadingSpace',
            "Leading space detected in the text.",
        );
    }
}


sub eof
{
    my $self = shift;

    return (!defined( ${ $self->curr_line_ref() } ));
}


1;

__END__