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package ANTLR::Runtime::ANTLRStringStream;
use Carp;
use Readonly;
use ANTLR::Runtime::CharStreamState;
use Moose;
with 'ANTLR::Runtime::IntStream', 'ANTLR::Runtime::CharStream';
has 'input' => (
is => 'ro',
isa => 'Str',
required => 1,
);
has 'p' => (
is => 'rw',
isa => 'Int',
default => 0,
);
has 'line' => (
is => 'rw',
isa => 'Int',
default => 1,
);
has 'char_position_in_line' => (
is => 'rw',
isa => 'Int',
default => 0,
);
has 'mark_depth' => (
is => 'rw',
isa => 'Int',
default => 0,
);
has 'markers' => (
is => 'rw',
isa => 'ArrayRef[Maybe[ANTLR::Runtime::CharStreamState]]',
default => sub { [ undef ] },
);
has 'last_marker' => (
is => 'rw',
isa => 'Int',
default => 0,
);
has 'name' => (
is => 'rw',
isa => 'Str',
default => q{},
);
sub get_line {
my ($self) = @_;
return $self->line;
}
sub set_line {
my ($self, $value) = @_;
$self->line($value);
return;
}
sub get_char_position_in_line {
my ($self) = @_;
return $self->char_position_in_line;
}
sub set_char_position_in_line {
my ($self, $value) = @_;
$self->char_position_in_line($value);
return;
}
sub reset {
my ($self) = @_;
$self->p(0);
$self->line(1);
$self->char_position_in_line(0);
$self->mark_depth(0);
return;
}
sub consume {
my ($self) = @_;
if ($self->p < length $self->input) {
$self->char_position_in_line($self->char_position_in_line + 1);
if (substr($self->input, $self->p, 1) eq "\n") {
$self->line($self->line + 1);
$self->char_position_in_line(0);
}
$self->p($self->p + 1);
}
return;
}
sub LA {
my ($self, $i) = @_;
if ($i == 0) {
return undef;
}
if ($i < 0) {
++$i; # e.g., translate LA(-1) to use offset i=0; then input[p+0-1]
if ($self->p + $i - 1 < 0) {
return $self->EOF;
}
}
if ($self->p + $i - 1 >= length $self->input) {
return $self->EOF;
}
return substr $self->input, $self->p + $i - 1, 1;
}
sub LT {
my ($self, $i) = @_;
return $self->LA($i);
}
sub index {
my ($self) = @_;
return $self->p;
}
sub size {
my ($self) = @_;
return length $self->input;
}
sub mark {
my ($self) = @_;
$self->mark_depth($self->mark_depth + 1);
my $state;
if ($self->mark_depth >= @{$self->markers}) {
$state = ANTLR::Runtime::CharStreamState->new();
push @{$self->markers}, $state;
} else {
$state = $self->markers->[$self->mark_depth];
}
$state->set_p($self->p);
$state->set_line($self->line);
$state->set_char_position_in_line($self->char_position_in_line);
$self->last_marker($self->mark_depth);
return $self->mark_depth;
}
sub rewind {
my $self = shift;
my $m;
if (@_ == 0) {
$m = $self->last_marker;
} else {
$m = shift;
}
my $state = $self->markers->[$m];
# restore stream state
$self->seek($state->get_p);
$self->line($state->get_line);
$self->char_position_in_line($state->get_char_position_in_line);
$self->release($m);
return;
}
sub release {
my ($self, $marker) = @_;
# unwind any other markers made after m and release m
$self->mark_depth($marker);
# release this marker
$self->mark_depth($self->mark_depth - 1);
return;
}
# consume() ahead unit p == index; can't just set p = index as we must update
# line and char_position_in_line
sub seek {
my ($self, $index) = @_;
if ($index <= $self->p) {
# just jump; don't update stream state (line, ...)
$self->p($index);
return;
}
# seek forward, consume until p hits index
while ($self->p < $index) {
$self->consume();
}
return;
}
sub substring {
my ($self, $start, $stop) = @_;
return substr $self->input, $start, $stop - $start + 1;
}
sub get_source_name {
my ($self) = @_;
return $self->name;
}
no Moose;
__PACKAGE__->meta->make_immutable();
1;
|
