/
Recognizer.pm
1024 lines (895 loc) · 38.8 KB
/
Recognizer.pm
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# Copyright 2012 Jeffrey Kegler
# This file is part of Marpa::R2. Marpa::R2 is free software: you can
# redistribute it and/or modify it under the terms of the GNU Lesser
# General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# Marpa::R2 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser
# General Public License along with Marpa::R2. If not, see
# http://www.gnu.org/licenses/.
package Marpa::R2::Recognizer;
use 5.010;
use warnings;
use strict;
use integer;
use English qw( -no_match_vars );
use vars qw($VERSION $STRING_VERSION);
$VERSION = '0.001_021';
$STRING_VERSION = $VERSION;
## no critic(BuiltinFunctions::ProhibitStringyEval)
$VERSION = eval $VERSION;
## use critic
# Elements of the RECOGNIZER structure
BEGIN {
my $structure = <<'END_OF_STRUCTURE';
:package=Marpa::R2::Internal::Recognizer
C { C structure for the recognizer }
B_C { C structure for the bocage }
O_C { C structure for the Marpa order object }
T_C { C structure for the Marpa tree iterator }
GRAMMAR { the grammar used }
FINISHED
TOKEN_VALUES
TRACE_FILE_HANDLE
END
CLOSURES
TRACE_ACTIONS
TRACE_AND_NODES
TRACE_BOCAGE
TRACE_OR_NODES
TRACE_VALUES
TRACE_TASKS
MAX_PARSES
NULL_VALUES
RANKING_METHOD
{ The following fields must be reinitialized when
evaluation is reset }
RULE_CLOSURES
{ This is the end of the list of fields which
must be reinitialized when evaluation is reset }
TRACE_EARLEY_SETS
TRACE_TERMINALS
WARNINGS
END_OF_STRUCTURE
Marpa::R2::offset($structure);
} ## end BEGIN
package Marpa::R2::Internal::Recognizer;
use English qw( -no_match_vars );
my $parse_number = 0;
# Returns the new parse object or throws an exception
sub Marpa::R2::Recognizer::new {
my ( $class, @arg_hashes ) = @_;
my $recce = bless [], $class;
my $grammar;
ARG_HASH: for my $arg_hash (@arg_hashes) {
if ( defined( $grammar = $arg_hash->{grammar} ) ) {
delete $arg_hash->{grammar};
last ARG_HASH;
}
} ## end for my $arg_hash (@arg_hashes)
Marpa::R2::exception('No grammar specified') if not defined $grammar;
$recce->[Marpa::R2::Internal::Recognizer::GRAMMAR] = $grammar;
my $grammar_class = ref $grammar;
Marpa::R2::exception(
"${class}::new() grammar arg has wrong class: $grammar_class")
if not $grammar_class eq 'Marpa::R2::Grammar';
my $grammar_c = $grammar->[Marpa::R2::Internal::Grammar::C];
my $problems = $grammar->[Marpa::R2::Internal::Grammar::PROBLEMS];
if ($problems) {
Marpa::R2::exception(
Marpa::R2::Grammar::show_problems($grammar),
"Attempt to parse grammar with fatal problems\n",
'Marpa::R2 cannot proceed',
);
} ## end if ($problems)
# set the defaults
local $Marpa::R2::Internal::TRACE_FH = my $trace_fh =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_FILE_HANDLE] =
$grammar->[Marpa::R2::Internal::Grammar::TRACE_FILE_HANDLE];
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C] =
Marpa::R2::Internal::R_C->new($grammar_c);
if ( not defined $recce_c ) {
my $error_code = $grammar_c->error_code() // -1;
if ( $error_code == $Marpa::R2::Error::NOT_PRECOMPUTED ) {
Marpa::R2::exception(
'Attempt to parse grammar which is not precomputed');
}
Marpa::R2::exception( $grammar_c->error());
} ## end if ( not defined $recce_c )
$recce->[Marpa::R2::Internal::Recognizer::WARNINGS] = 1;
$recce->[Marpa::R2::Internal::Recognizer::RANKING_METHOD] = 'none';
$recce->[Marpa::R2::Internal::Recognizer::MAX_PARSES] = 0;
# First position is reserved for undef
$recce->[Marpa::R2::Internal::Recognizer::TOKEN_VALUES] = [undef];
$recce->reset_evaluation();
$recce->set(@arg_hashes);
my $trace_terminals =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_TERMINALS] // 0;
my $trace_tasks = $recce->[Marpa::R2::Internal::Recognizer::TRACE_TASKS]
// 0;
if ( not $recce_c->start_input() ) {
my $error = $recce_c->error();
Marpa::R2::exception( 'Recognizer start of input failed: ', $error );
}
my $symbol_hash = $grammar->[Marpa::R2::Internal::Grammar::SYMBOL_HASH];
$recce->[Marpa::R2::Internal::Recognizer::GRAMMAR] = $grammar;
if ( $trace_terminals > 1 ) {
my @terminals_expected = @{ $recce->terminals_expected() };
for my $terminal ( sort @terminals_expected ) {
say {$Marpa::R2::Internal::TRACE_FH}
qq{Expecting "$terminal" at earleme 0}
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( $trace_terminals > 1 )
return $recce;
} ## end sub Marpa::R2::Recognizer::new
use constant RECOGNIZER_OPTIONS => [
qw{
closures
end
leo
max_parses
ranking_method
too_many_earley_items
trace_actions
trace_and_nodes
trace_bocage
trace_earley_sets
trace_fh
trace_file_handle
trace_or_nodes
trace_tasks
trace_terminals
trace_values
warnings
}
];
sub Marpa::R2::Recognizer::reset_evaluation {
my ($recce) = @_;
$recce->[Marpa::R2::Internal::Recognizer::B_C] = undef;
$recce->[Marpa::R2::Internal::Recognizer::O_C] = undef;
$recce->[Marpa::R2::Internal::Recognizer::T_C] = undef;
$recce->[Marpa::R2::Internal::Recognizer::RULE_CLOSURES] = [];
return;
} ## end sub Marpa::R2::Recognizer::reset_evaluation
sub Marpa::R2::Recognizer::set {
my ( $recce, @arg_hashes ) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
# This may get changed below
my $trace_fh =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_FILE_HANDLE];
for my $args (@arg_hashes) {
my $ref_type = ref $args;
if ( not $ref_type or $ref_type ne 'HASH' ) {
Carp::croak(
'Marpa::R2 Recognizer expects args as ref to HASH, got ',
( "ref to $ref_type" || 'non-reference' ),
' instead'
);
} ## end if ( not $ref_type or $ref_type ne 'HASH' )
if (my @bad_options =
grep {
not $_ ~~ Marpa::R2::Internal::Recognizer::RECOGNIZER_OPTIONS
}
keys %{$args}
)
{
Carp::croak( 'Unknown option(s) for Marpa::R2 Recognizer: ',
join q{ }, @bad_options );
} ## end if ( my @bad_options = grep { not $_ ~~ ...})
if ( defined( my $value = $args->{'leo'} ) ) {
# Not allowed once input has started
if ( $recce_c->current_earleme() >= 0 ) {
Marpa::R2::exception(
q{Cannot reset 'leo' once input has started});
}
my $boolean = $value ? 1 : 0;
$recce_c->is_use_leo_set($boolean);
} ## end if ( defined( my $value = $args->{'leo'} ) )
if ( defined( my $value = $args->{'max_parses'} ) ) {
$recce->[Marpa::R2::Internal::Recognizer::MAX_PARSES] = $value;
}
if ( defined( my $value = $args->{'ranking_method'} ) ) {
# Not allowed once parsing is started
if ( defined $recce->[Marpa::R2::Internal::Recognizer::B_C]) {
Marpa::R2::exception(
q{Cannot change ranking method once parsing has started});
}
my @ranking_methods = qw(high_rule_only rule none);
Marpa::R2::exception(
qq{ranking_method value is $value (should be one of },
( join q{, }, map { q{'} . $_ . q{'} } @ranking_methods ),
')' )
if not $value ~~ \@ranking_methods;
$recce->[Marpa::R2::Internal::Recognizer::RANKING_METHOD] =
$value;
} ## end if ( defined( my $value = $args->{'ranking_method'} ...))
if ( defined( my $value = $args->{'trace_fh'} ) ) {
$trace_fh =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_FILE_HANDLE] =
$value;
}
if ( defined( my $value = $args->{'trace_file_handle'} ) ) {
$trace_fh =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_FILE_HANDLE] =
$value;
}
if ( defined( my $value = $args->{'trace_actions'} ) ) {
$recce->[Marpa::R2::Internal::Recognizer::TRACE_ACTIONS] = $value;
if ($value) {
say {$trace_fh} 'Setting trace_actions option'
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_actions'} ))
if ( defined( my $value = $args->{'trace_and_nodes'} ) ) {
Marpa::R2::exception(
'trace_and_nodes must be set to a number >= 0')
if $value !~ /\A\d+\z/xms;
$recce->[Marpa::R2::Internal::Recognizer::TRACE_AND_NODES] =
$value + 0;
if ($value) {
say {$trace_fh} "Setting trace_and_nodes option to $value"
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_and_nodes'}...))
if ( defined( my $value = $args->{'trace_bocage'} ) ) {
Marpa::R2::exception('trace_bocage must be set to a number >= 0')
if $value !~ /\A\d+\z/xms;
$recce->[Marpa::R2::Internal::Recognizer::TRACE_BOCAGE] =
$value + 0;
if ($value) {
say {$trace_fh} "Setting trace_bocage option to $value"
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_bocage'} ) )
if ( defined( my $value = $args->{'trace_or_nodes'} ) ) {
Marpa::R2::exception(
'trace_or_nodes must be set to a number >= 0')
if $value !~ /\A\d+\z/xms;
$recce->[Marpa::R2::Internal::Recognizer::TRACE_OR_NODES] =
$value + 0;
if ($value) {
say {$trace_fh} "Setting trace_or_nodes option to $value"
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_or_nodes'} ...))
if ( defined( my $value = $args->{'trace_tasks'} ) ) {
Marpa::R2::exception('trace_tasks must be set to a number >= 0')
if $value !~ /\A\d+\z/xms;
$recce->[Marpa::R2::Internal::Recognizer::TRACE_TASKS] =
$value + 0;
if ($value) {
say {$trace_fh} "Setting trace_tasks option to $value"
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_tasks'} ) )
if ( defined( my $value = $args->{'trace_terminals'} ) ) {
$recce->[Marpa::R2::Internal::Recognizer::TRACE_TERMINALS] =
$value;
if ($value) {
say {$trace_fh} 'Setting trace_terminals option'
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_terminals'}...))
if ( defined( my $value = $args->{'trace_earley_sets'} ) ) {
$recce->[Marpa::R2::Internal::Recognizer::TRACE_EARLEY_SETS] =
$value;
if ($value) {
say {$trace_fh} 'Setting trace_earley_sets option'
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_earley_sets'...}))
if ( defined( my $value = $args->{'trace_values'} ) ) {
$recce->[Marpa::R2::Internal::Recognizer::TRACE_VALUES] = $value;
if ($value) {
say {$trace_fh} 'Setting trace_values option'
or Marpa::R2::exception("Cannot print: $ERRNO");
}
} ## end if ( defined( my $value = $args->{'trace_values'} ) )
if ( defined( my $value = $args->{'end'} ) ) {
# Not allowed once evaluation is started
if ( defined $recce->[Marpa::R2::Internal::Recognizer::B_C]) {
Marpa::R2::exception(
q{Cannot reset end once evaluation has started});
}
$recce->[Marpa::R2::Internal::Recognizer::END] = $value;
} ## end if ( defined( my $value = $args->{'end'} ) )
if ( defined( my $value = $args->{'closures'} ) ) {
# Not allowed once evaluation is started
if ( defined $recce->[Marpa::R2::Internal::Recognizer::B_C]) {
Marpa::R2::exception(
q{Cannot reset closures once evaluation has started});
}
my $closures =
$recce->[Marpa::R2::Internal::Recognizer::CLOSURES] = $value;
while ( my ( $action, $closure ) = each %{$closures} ) {
Marpa::R2::exception(qq{Bad closure for action "$action"})
if ref $closure ne 'CODE';
}
} ## end if ( defined( my $value = $args->{'closures'} ) )
if ( defined( my $value = $args->{'warnings'} ) ) {
$recce->[Marpa::R2::Internal::Recognizer::WARNINGS] = $value;
}
if ( defined( my $value = $args->{'too_many_earley_items'} ) ) {
$recce_c->earley_item_warning_threshold_set($value);
}
} ## end for my $args (@arg_hashes)
return 1;
} ## end sub Marpa::R2::Recognizer::set
# Not intended to be documented.
# Returns the size of the last completed earley set.
# For testing, especially that the Leo items
# are doing their job.
sub Marpa::R2::Recognizer::earley_set_size {
my ( $recce, $set_id ) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
return $recce_c->earley_set_size($set_id);
}
sub Marpa::R2::Recognizer::latest_earley_set {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
return $recce_c->latest_earley_set();
}
sub Marpa::R2::Recognizer::check_terminal {
my ( $recce, $name ) = @_;
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
return $grammar->check_terminal($name);
}
sub Marpa::R2::Recognizer::exhausted {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
return $recce_c->is_exhausted();
}
sub Marpa::R2::Recognizer::current_earleme {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
return $recce_c->current_earleme();
}
sub Marpa::R2::Recognizer::furthest_earleme {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
return $recce_c->furthest_earleme();
}
# Deprecated -- obsolete
sub Marpa::R2::Recognizer::status {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
return ( $recce_c->current_earleme(), $recce->terminals_expected() )
if wantarray;
return $recce->current_earleme();
} ## end sub Marpa::R2::Recognizer::status
# Now useless and deprecated
sub Marpa::R2::Recognizer::strip { return 1; }
# Viewing methods, for debugging
sub Marpa::R2::show_leo_item {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $leo_base_state = $recce_c->leo_base_state();
return if not defined $leo_base_state;
my $trace_earley_set = $recce_c->trace_earley_set();
my $trace_earleme = $recce_c->earleme($trace_earley_set);
my $postdot_symbol_id = $recce_c->postdot_item_symbol();
my $predecessor_symbol_id = $recce_c->leo_predecessor_symbol();
my $base_origin_set_id = $recce_c->leo_base_origin();
my $base_origin_earleme = $recce_c->earleme($base_origin_set_id);
my $postdot_symbol_name = $grammar->symbol_name($postdot_symbol_id);
my $text = sprintf 'L%d@%d', $postdot_symbol_id, $trace_earleme;
my @link_texts = qq{"$postdot_symbol_name"};
if ( defined $predecessor_symbol_id ) {
push @link_texts, sprintf 'L%d@%d', $predecessor_symbol_id,
$base_origin_earleme;
}
push @link_texts, sprintf 'S%d@%d-%d', $leo_base_state,
$base_origin_earleme,
$trace_earleme;
$text .= ' [' . ( join '; ', @link_texts ) . ']';
return $text;
} ## end sub Marpa::R2::show_leo_item
# Assumes trace token source link set by caller
sub Marpa::R2::show_token_link_choice {
my ( $recce, $current_earleme ) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $symbols = $grammar->[Marpa::R2::Internal::Grammar::SYMBOLS];
my $text = q{};
my @pieces = ();
my ( $token_id, $value_ix ) = $recce_c->source_token();
my $predecessor_state = $recce_c->source_predecessor_state();
my $origin_set_id = $recce_c->earley_item_origin();
my $origin_earleme = $recce_c->earleme($origin_set_id);
my $middle_earleme = $origin_earleme;
if ( defined $predecessor_state ) {
my $middle_set_id = $recce_c->source_middle();
$middle_earleme = $recce_c->earleme($middle_set_id);
push @pieces,
'p=S'
. $predecessor_state . q{@}
. $origin_earleme . q{-}
. $middle_earleme;
} ## end if ( defined $predecessor_state )
my $symbol_name = $grammar->symbol_name($token_id);
push @pieces, 's=' . $symbol_name;
my $token_length = $current_earleme - $middle_earleme;
my $value =
$recce->[Marpa::R2::Internal::Recognizer::TOKEN_VALUES]->[$value_ix];
my $token_dump = Data::Dumper->new( [ \$value ] )->Terse(1)->Dump;
chomp $token_dump;
push @pieces, "t=$token_dump";
return '[' . ( join '; ', @pieces ) . ']';
} ## end sub Marpa::R2::show_token_link_choice
# Assumes trace completion source link set by caller
sub Marpa::R2::show_completion_link_choice {
my ( $recce, $AHFA_state_id, $current_earleme ) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $symbols = $grammar->[Marpa::R2::Internal::Grammar::SYMBOLS];
my $text = q{};
my @pieces = ();
my $predecessor_state = $recce_c->source_predecessor_state();
my $origin_set_id = $recce_c->earley_item_origin();
my $origin_earleme = $recce_c->earleme($origin_set_id);
my $middle_set_id = $recce_c->source_middle();
my $middle_earleme = $recce_c->earleme($middle_set_id);
if ( defined $predecessor_state ) {
push @pieces,
'p=S'
. $predecessor_state . q{@}
. $origin_earleme . q{-}
. $middle_earleme;
} ## end if ( defined $predecessor_state )
push @pieces,
'c=S'
. $AHFA_state_id . q{@}
. $middle_earleme . q{-}
. $current_earleme;
return '[' . ( join '; ', @pieces ) . ']';
} ## end sub Marpa::R2::show_completion_link_choice
# Assumes trace completion source link set by caller
sub Marpa::R2::show_leo_link_choice {
my ( $recce, $AHFA_state_id, $current_earleme ) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $symbols = $grammar->[Marpa::R2::Internal::Grammar::SYMBOLS];
my $text = q{};
my @pieces = ();
my $middle_set_id = $recce_c->source_middle();
my $middle_earleme = $recce_c->earleme($middle_set_id);
my $leo_transition_symbol = $recce_c->source_leo_transition_symbol();
push @pieces, 'l=L' . $leo_transition_symbol . q{@} . $middle_earleme;
push @pieces,
'c=S'
. $AHFA_state_id . q{@}
. $middle_earleme . q{-}
. $current_earleme;
return '[' . ( join '; ', @pieces ) . ']';
} ## end sub Marpa::R2::show_leo_link_choice
# Assumes trace earley item was set by caller
sub Marpa::R2::show_earley_item {
my ( $recce, $current_es, $state_id ) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $text = q{};
my $origin_set_id = $recce_c->earley_item_origin();
my $earleme = $recce_c->earleme($current_es);
my $origin_earleme = $recce_c->earleme($origin_set_id);
$text .= sprintf "S%d@%d-%d", $state_id, $origin_earleme, $earleme;
my @pieces = $text;
my @sort_data = ();
for (
my $symbol_id = $recce_c->first_token_link_trace();
defined $symbol_id;
$symbol_id = $recce_c->next_token_link_trace()
)
{
push @sort_data,
[
$recce_c->source_middle(),
$symbol_id,
( $recce_c->source_predecessor_state() // -1 ),
Marpa::R2::show_token_link_choice( $recce, $earleme )
];
} ## end for ( my $symbol_id = $recce_c->first_token_link_trace...)
push @pieces, map { $_->[-1] } sort {
$a->[0] <=> $b->[0]
|| $a->[1] <=> $b->[1]
|| $a->[2] <=> $b->[2]
} @sort_data;
@sort_data = ();
for (
my $cause_AHFA_id = $recce_c->first_completion_link_trace();
defined $cause_AHFA_id;
$cause_AHFA_id = $recce_c->next_completion_link_trace()
)
{
push @sort_data,
[
$recce_c->source_middle(),
$cause_AHFA_id,
( $recce_c->source_predecessor_state() // -1 ),
Marpa::R2::show_completion_link_choice(
$recce, $cause_AHFA_id, $earleme
)
];
} ## end for ( my $cause_AHFA_id = $recce_c->first_completion_link_trace...)
push @pieces, map { $_->[-1] } sort {
$a->[0] <=> $b->[0]
|| $a->[1] <=> $b->[1]
|| $a->[2] <=> $b->[2]
} @sort_data;
@sort_data = ();
for (
my $AHFA_state_id = $recce_c->first_leo_link_trace();
defined $AHFA_state_id;
$AHFA_state_id = $recce_c->next_leo_link_trace()
)
{
push @sort_data,
[
$recce_c->source_middle(),
$AHFA_state_id,
$recce_c->source_leo_transition_symbol(),
Marpa::R2::show_leo_link_choice(
$recce, $AHFA_state_id, $earleme
)
];
} ## end for ( my $AHFA_state_id = $recce_c->first_leo_link_trace...)
push @pieces, map { $_->[-1] } sort {
$a->[0] <=> $b->[0]
|| $a->[1] <=> $b->[1]
|| $a->[2] <=> $b->[2]
} @sort_data;
return join q{ }, @pieces;
} ## end sub Marpa::R2::show_earley_item
sub Marpa::R2::show_earley_set {
my ( $recce, $traced_set_id ) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $text = q{};
my @sort_data = ();
if ( not defined $recce_c->earley_set_trace($traced_set_id) ) {
return $text;
}
EARLEY_ITEM: for ( my $item_id = 0;; $item_id++ ) {
my $state_id = $recce_c->earley_item_trace($item_id);
last EARLEY_ITEM if not defined $state_id;
push @sort_data,
[
$recce_c->earley_item_origin(), $state_id,
Marpa::R2::show_earley_item( $recce, $traced_set_id, $state_id )
];
} ## end for ( my $item_id = 0;; $item_id++ )
my @sorted_data =
map { $_->[-1] . "\n" }
sort { $a->[0] <=> $b->[0] || $a->[1] <=> $b->[1] } @sort_data;
@sort_data = ();
POSTDOT_ITEM:
for (
my $postdot_symbol_id = $recce_c->first_postdot_item_trace();
defined $postdot_symbol_id;
$postdot_symbol_id = $recce_c->next_postdot_item_trace()
)
{
# If there is no base Earley item,
# then this is not a Leo item, so we skip it
my $leo_item_desc = Marpa::R2::show_leo_item($recce);
next POSTDOT_ITEM if not defined $leo_item_desc;
push @sort_data, [ $postdot_symbol_id, $leo_item_desc ];
} ## end for ( my $postdot_symbol_id = $recce_c->first_postdot_item_trace...)
push @sorted_data, join q{},
map { $_->[-1] . "\n" } sort { $a->[0] <=> $b->[0] } @sort_data;
return join q{}, @sorted_data;
} ## end sub Marpa::R2::show_earley_set
sub Marpa::R2::Recognizer::show_earley_sets {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $last_completed_earleme = $recce_c->current_earleme();
my $furthest_earleme = $recce_c->furthest_earleme();
my $text = "Last Completed: $last_completed_earleme; "
. "Furthest: $furthest_earleme\n";
LIST: for ( my $ix = 0;; $ix++ ) {
my $set_desc = Marpa::R2::show_earley_set( $recce, $ix );
last LIST if not $set_desc;
$text .= "Earley Set $ix\n$set_desc";
}
return $text;
} ## end sub Marpa::R2::Recognizer::show_earley_sets
BEGIN {
my $structure = <<'END_OF_STRUCTURE';
:package=Marpa::R2::Internal::Progress_Report
RULE_ID
POSITION
ORIGIN
CURRENT
END_OF_STRUCTURE
Marpa::R2::offset($structure);
} ## end BEGIN
sub Marpa::R2::Recognizer::show_progress {
my ( $recce, $start_ordinal, $end_ordinal ) = @_;
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $grammar_c = $grammar->[Marpa::R2::Internal::Grammar::C];
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $last_ordinal = $recce_c->latest_earley_set();
if ( not defined $start_ordinal ) {
$start_ordinal = $last_ordinal;
}
if ( $start_ordinal < 0 ) {
$start_ordinal += $last_ordinal + 1;
}
else {
if ( $start_ordinal < 0 or $start_ordinal > $last_ordinal ) {
return
"Marpa::PP::Recognizer::show_progress start index is $start_ordinal, "
. "must be in range 0-$last_ordinal";
}
} ## end else [ if ( $start_ordinal < 0 ) ]
if ( not defined $end_ordinal ) {
$end_ordinal = $start_ordinal;
}
else {
my $end_ordinal_argument = $end_ordinal;
if ( $end_ordinal < 0 ) {
$end_ordinal += $last_ordinal + 1;
}
if ( $end_ordinal < 0 ) {
return
"Marpa::PP::Recognizer::show_progress end index is $end_ordinal_argument, "
. sprintf ' must be in range %d-%d', -( $last_ordinal + 1 ),
$last_ordinal;
} ## end if ( $end_ordinal < 0 )
} ## end else [ if ( not defined $end_ordinal ) ]
my $text = q{};
for my $current_ordinal ( $start_ordinal .. $end_ordinal ) {
my $current_earleme = $recce_c->earleme($current_ordinal);
my %by_rule_by_position = ();
my $reports = report_progress( $recce, $current_ordinal );
for my $report ( @{$reports} ) {
my $rule_id =
$report->[Marpa::R2::Internal::Progress_Report::RULE_ID];
my $position =
$report->[Marpa::R2::Internal::Progress_Report::POSITION];
my $origin =
$report->[Marpa::R2::Internal::Progress_Report::ORIGIN];
$by_rule_by_position{$rule_id}->{$position}->{$origin}++;
} ## end for my $report ( @{$reports} )
for my $rule_id ( sort { $a <=> $b } keys %by_rule_by_position ) {
my $by_position = $by_rule_by_position{$rule_id};
for my $position ( sort { $a <=> $b } keys %{$by_position} ) {
my $raw_origins = $by_position->{$position};
my @origins = sort { $a <=> $b } keys %{$raw_origins};
my $origins_count = scalar @origins;
my $origin_desc;
if ( $origins_count <= 3 ) {
$origin_desc = join q{,}, @origins;
}
else {
$origin_desc = $origins[0] . q{...} . $origins[-1];
}
my $rhs_length = $grammar_c->rule_length($rule_id);
my $item_text;
# flag indicating whether we need to show the dot in the rule
if ( $position >= $rhs_length ) {
$item_text .= "F$rule_id";
}
elsif ($position) {
$item_text .= "R$rule_id:$position";
}
else {
$item_text .= "P$rule_id";
}
$item_text .= " x$origins_count" if $origins_count > 1;
$item_text
.= q{ @} . $origin_desc . q{-} . $current_earleme . q{ };
$item_text
.= $grammar->show_dotted_rule( $rule_id, $position );
$text .= $item_text . "\n";
} ## end for my $position ( sort { $a <=> $b } keys %{...})
} ## end for my $rule_id ( sort { $a <=> $b } keys ...)
} ## end for my $current_ordinal ( $start_ordinal .. $end_ordinal)
return $text;
} ## end sub Marpa::R2::Recognizer::show_progress
# This function may return duplicates. In displaying the results,
# it is usually # desirable to sort the results,
# and that is the most convenient
# point at which to eliminate duplicates.
sub report_progress {
my ( $recce, $current_set ) = @_;
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $rules = $grammar->[Marpa::R2::Internal::Grammar::RULES];
my $grammar_c = $grammar->[Marpa::R2::Internal::Grammar::C];
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $earleme = $recce_c->earleme($current_set);
# Reports must be unique by a key
# composted of original rule, rule position, and
# location in the parse. This hash is to
# quarantee that.
my @progress_reports = ();
my @per_AHFA_item_data = ();
# Building the Leo expansion items immediately would
# require switching traced Earley sets and breaking
# the sequence of the earley items. So we create a
# worklist of them for later.
my @leo_worklist = ();
$recce_c->earley_set_trace($current_set);
EARLEY_ITEM:
for (
my $item_id = 0;
defined( my $AHFA_state_id = $recce_c->earley_item_trace($item_id) );
$item_id++
)
{
my $origin_set_id = $recce_c->earley_item_origin();
my $origin_earleme = $recce_c->earleme($origin_set_id);
LEO_SOURCE:
for (
my $AHFA_state_id = $recce_c->first_leo_link_trace();
defined $AHFA_state_id;
$AHFA_state_id = $recce_c->next_leo_link_trace()
)
{
# The first Leo link is ignored, the current eim item
# is a Leo completion and therefore the Leo expansion
# of its own first Leo link
my $leo_transition_symbol =
$recce_c->source_leo_transition_symbol();
next LEO_SOURCE if not defined $leo_transition_symbol;
my $previous_lim_set_id = $recce_c->source_middle();
push @leo_worklist,
[ $previous_lim_set_id, $leo_transition_symbol ];
} ## end for ( my $AHFA_state_id = $recce_c->first_leo_link_trace...)
push @per_AHFA_item_data, [ $origin_earleme, $AHFA_state_id ];
} ## end for ( my $item_id = 0; defined( my $AHFA_state_id = $recce_c...))
for my $leo_workitem (@leo_worklist) {
my ( $leo_item_set_id, $leo_item_postdot_symbol ) = @{$leo_workitem};
LEO_ITEM: for ( ;; ) {
$recce_c->earley_set_trace($leo_item_set_id);
$recce_c->postdot_symbol_trace($leo_item_postdot_symbol);
my $expansion_ahfa = $recce_c->leo_expansion_ahfa();
push @per_AHFA_item_data,
[ $recce_c->earleme($leo_item_set_id), $expansion_ahfa ];
$leo_item_postdot_symbol = $recce_c->leo_predecessor_symbol();
last LEO_ITEM if not defined $leo_item_postdot_symbol;
$leo_item_set_id = $recce_c->leo_base_origin();
} ## end for ( ;; )
} ## end for my $leo_workitem (@leo_worklist)
for my $per_AHFA_item_datum (@per_AHFA_item_data) {
my ( $origin, $AHFA_state_id ) = @{$per_AHFA_item_datum};
my @AHFA_items = $grammar_c->AHFA_state_items($AHFA_state_id);
AHFA_ITEM: for my $AHFA_item_id (@AHFA_items) {
my $marpa_rule_id = $grammar_c->AHFA_item_rule($AHFA_item_id);
my $marpa_rule = $rules->[$marpa_rule_id];
my $marpa_position =
$grammar_c->AHFA_item_position($AHFA_item_id);
$marpa_position < 0
and $marpa_position = $grammar_c->rule_length($marpa_rule_id);
my $chaf_start = $grammar_c->rule_virtual_start($marpa_rule_id);
$chaf_start < 0 and $chaf_start = undef;
my $original_rule_id =
defined $chaf_start
? ( $grammar_c->rule_original($marpa_rule_id)
// $marpa_rule_id )
: $marpa_rule_id;
# position in original rule, to be calculated
my $original_position;
if ( defined $chaf_start ) {
$original_position =
$marpa_position >= $grammar_c->rule_length($marpa_rule_id)
? $grammar_c->rule_length($original_rule_id)
: ( $chaf_start + $marpa_position );
} ## end if ( defined $chaf_start )
$original_position //= $marpa_position;
my $rule_id = $original_rule_id;
push @progress_reports,
[ $rule_id, $original_position, $origin, $earleme ];
} ## end for my $AHFA_item_id (@AHFA_items)
} ## end for my $per_AHFA_item_datum (@per_AHFA_item_data)
return \@progress_reports;
} ## end sub report_progress
sub Marpa::R2::Recognizer::read {
my $recce = shift;
return if not $recce->alternative(@_);
return $recce->earleme_complete();
}
sub Marpa::R2::Recognizer::alternative {
my ( $recce, $symbol_name, $value, $length ) = @_;
Marpa::R2::exception(
'No recognizer object for Marpa::R2::Recognizer::tokens')
if not defined $recce
or ref $recce ne 'Marpa::R2::Recognizer';
Marpa::R2::exception('Attempt to read token after parsing is finished')
if $recce->[Marpa::R2::Internal::Recognizer::FINISHED];
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $trace_fh =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_FILE_HANDLE];
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $token_values =
$recce->[Marpa::R2::Internal::Recognizer::TOKEN_VALUES];
my $symbol_hash = $grammar->[Marpa::R2::Internal::Grammar::SYMBOL_HASH];
my $symbol_id = $symbol_hash->{$symbol_name};
if (not defined $symbol_id) {
Marpa::R2::exception(qq{alternative(): symbol "$symbol_name" does not exist});
}
my $value_ix = 0;
if ( defined $value ) {
$value_ix = scalar @{$token_values};
push @{$token_values}, $value;
}
$length //= 1;
my $result = $recce_c->alternative( $symbol_id, $value_ix, $length );
my $trace_terminals =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_TERMINALS];
if ($trace_terminals) {
my $verb = defined $result ? 'Accepted' : 'Rejected';
my $current_earleme = $result // $recce_c->current_earleme();
say {$trace_fh} qq{$verb "$symbol_name" at $current_earleme-}
. ( $length + $current_earleme )
or Marpa::R2::exception("Cannot print: $ERRNO");
} ## end if ($trace_terminals)
return if not defined $result;
return 1;
} ## end sub Marpa::R2::Recognizer::alternative
# Perform the completion step on an earley set
sub Marpa::R2::Recognizer::end_input {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $furthest_earleme = $recce_c->furthest_earleme();
while ( $recce_c->current_earleme() < $furthest_earleme ) {
$recce->earleme_complete();
}
$recce->[Marpa::R2::Internal::Recognizer::FINISHED] = 1;
return 1;
} ## end sub Marpa::R2::Recognizer::end_input
sub Marpa::R2::Recognizer::terminals_expected {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
return [ map { $grammar->symbol_name($_) }
$recce_c->terminals_expected() ];
} ## end sub Marpa::R2::Recognizer::terminals_expected
sub Marpa::R2::Recognizer::earleme_complete {
my ($recce) = @_;
my $recce_c = $recce->[Marpa::R2::Internal::Recognizer::C];
local $Marpa::R2::Internal::TRACE_FH =
$recce->[Marpa::R2::Internal::Recognizer::TRACE_FILE_HANDLE];
my $grammar = $recce->[Marpa::R2::Internal::Recognizer::GRAMMAR];
my $symbol_hash = $grammar->[Marpa::R2::Internal::Grammar::SYMBOL_HASH];
my $symbols = $grammar->[Marpa::R2::Internal::Grammar::SYMBOLS];
my $event_count = $recce_c->earleme_complete();
EVENT: for my $event_ix ( 0 .. $event_count - 1 ) {
my ($event_type, $value) = $recce_c->event($event_ix);
next EVENT if $event_type eq 'MARPA_EVENT_EXHAUSTED';
if ( $event_type eq 'MARPA_EVENT_EARLEY_ITEM_THRESHOLD' ) {
say {
$recce->[Marpa::R2::Internal::Recognizer::TRACE_FILE_HANDLE] }
"Earley item count ($value) exceeds warning threshold"
or die "say: $ERRNO";
next EVENT;
} ## end if ( $event_type eq 'MARPA_EVENT_EARLEY_ITEM_THRESHOLD')
Marpa::R2::exception(
qq{Unknown earleme completion event; type="$event_type"});
} ## end for my $event_ix ( 0 .. $event_count - 1 )
if ( $recce->[Marpa::R2::Internal::Recognizer::TRACE_EARLEY_SETS] ) {
my $latest_set = $recce_c->latest_earley_set();