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# Copyright 2022 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::Thin::Trace;
use 5.010001;
use warnings;
use strict;
use vars qw($VERSION $STRING_VERSION);
$VERSION = '12.000000';
$STRING_VERSION = $VERSION;
$VERSION = eval $VERSION;
sub new {
my ( $class, $grammar ) = @_;
my $self = bless {}, $class;
$self->{g} = $grammar;
$self->{symbol_by_name} = {};
$self->{symbol_names} = {};
return $self;
} ## end sub new
sub grammar {
my ($self) = @_;
return $self->{g};
}
sub symbol_by_name {
my ( $self, $name ) = @_;
return $self->{symbol_by_name}->{$name};
}
sub symbol_name {
my ( $self, $symbol_id ) = @_;
my $symbol_name = $self->{symbol_name}->[$symbol_id];
$symbol_name = 'R' . $symbol_id if not defined $symbol_name;
return $symbol_name;
} ## end sub symbol_name
sub formatted_symbol_name {
my ( $self, $symbol_id ) = @_;
my $symbol_name = $self->symbol_name($symbol_id);
# As-is if all word characters
return $symbol_name if $symbol_name =~ m/ \A \w* \z/xms;
# As-is if ends in right bracket
return $symbol_name if $symbol_name =~ m/ \] \z/xms;
return '<' . $symbol_name . '>';
}
sub symbol_name_set {
my ( $self, $name, $symbol_id ) = @_;
$self->{symbol_name}->[$symbol_id] = $name;
$self->{symbol_by_name}->{$name} = $symbol_id;
return $symbol_id;
} ## end sub symbol_name_set
sub symbol_new {
my ( $self, $name ) = @_;
return $self->symbol_name_set( $name, $self->{g}->symbol_new() );
}
sub symbol_force {
my ( $self, $name ) = @_;
return $self->{symbol_by_name}->{$name} // $self->symbol_new($name);
}
sub rule {
my ( $self, $rule_id ) = @_;
my $grammar = $self->{g};
my $rule_length = $grammar->rule_length($rule_id);
my $lhs = $self->symbol_name( $grammar->rule_lhs($rule_id) );
my @rhs =
map { $self->symbol_name( $grammar->rule_rhs( $rule_id, $_ ) ) }
( 0 .. $rule_length - 1 );
return ($lhs, @rhs);
}
# Expand a rule into a list of symbol IDs
sub rule_expand {
my ( $self, $rule_id ) = @_;
my $grammar = $self->{g};
my $rule_length = $grammar->rule_length($rule_id);
return if not defined $rule_length;
my $lhs = ( $grammar->rule_lhs($rule_id) );
return ( $lhs,
map { $grammar->rule_rhs( $rule_id, $_ ) }
( 0 .. $rule_length - 1 ) );
} ## end sub rule_expand
sub dotted_rule {
my ( $self, $rule_id, $dot_position ) = @_;
my $grammar = $self->{g};
my $rule_length = $grammar->rule_length($rule_id);
$dot_position = $rule_length if $dot_position < 0;
my $lhs = $self->formatted_symbol_name( $grammar->rule_lhs($rule_id) );
my @rhs =
map { $self->formatted_symbol_name( $grammar->rule_rhs( $rule_id, $_ ) ) }
( 0 .. $rule_length - 1 );
$dot_position = 0 if $dot_position < 0;
splice( @rhs, $dot_position, 0, q{.} );
return join q{ }, $lhs, q{::=}, @rhs;
} ## end sub dotted_rule
sub brief_rule {
my ( $self, $rule_id ) = @_;
my $grammar = $self->{g};
my $rule_length = $grammar->rule_length($rule_id);
my $lhs = $self->formatted_symbol_name( $grammar->rule_lhs($rule_id) );
my @rhs =
map { $self->formatted_symbol_name( $grammar->rule_rhs( $rule_id, $_ ) ) }
( 0 .. $rule_length - 1 );
my $minimum = $grammar->sequence_min($rule_id);
my @quantifier = ();
if (defined $minimum) {
push @quantifier, ($minimum <= 0 ? q{ *} : q{ +});
}
return join q{ }, $lhs, q{::=}, @rhs, @quantifier;
} ## end sub dotted_rule
sub progress_report {
my ( $self, $recce, $ordinal ) = @_;
my $result = q{};
$ordinal //= $recce->latest_earley_set();
$recce->progress_report_start($ordinal);
ITEM: while (1) {
my ( $rule_id, $dot_position, $origin ) = $recce->progress_item();
last ITEM if not defined $rule_id;
$result
.= q{@}
. $origin . q{: }
. $self->dotted_rule( $rule_id, $dot_position ) . "\n";
} ## end ITEM: while (1)
$recce->progress_report_finish();
return $result;
} ## end sub progress_report
sub lexer_progress_report {
my ( $self, $slr, $ordinal ) = @_;
my $thin_slr = $slr->[Marpa::R2::Internal::Scanless::R::C];
my $result = q{};
$ordinal //= $thin_slr->lexer_latest_earley_set();
$thin_slr->lexer_progress_report_start($ordinal);
ITEM: while (1) {
my ( $rule_id, $dot_position, $origin ) = $thin_slr->lexer_progress_item();
last ITEM if not defined $rule_id;
$result
.= q{@}
. $origin . q{: }
. $self->dotted_rule( $rule_id, $dot_position ) . "\n";
} ## end ITEM: while (1)
$thin_slr->lexer_progress_report_finish();
return $result;
} ## end sub progress_report
sub show_dotted_irl {
my ( $self, $irl_id, $dot_position ) = @_;
my $grammar_c = $self->{g};
my $lhs_id = $grammar_c->_marpa_g_irl_lhs($irl_id);
my $irl_length = $grammar_c->_marpa_g_irl_length($irl_id);
my $text = $self->isy_name($lhs_id) . q{ ::=};
if ( $dot_position < 0 ) {
$dot_position = $irl_length;
}
my @rhs_names = ();
for my $ix ( 0 .. $irl_length - 1 ) {
my $rhs_nsy_id = $grammar_c->_marpa_g_irl_rhs( $irl_id, $ix );
my $rhs_nsy_name = $self->isy_name($rhs_nsy_id);
push @rhs_names, $rhs_nsy_name;
}
POSITION: for my $position ( 0 .. scalar @rhs_names ) {
if ( $position == $dot_position ) {
$text .= q{ .};
}
my $name = $rhs_names[$position];
next POSITION if not defined $name;
$text .= " $name";
} ## end POSITION: for my $position ( 0 .. scalar @rhs_names )
return $text;
} ## end sub show_dotted_irl
sub show_ahm {
my ( $self, $item_id ) = @_;
my $grammar_c = $self->{g};
my $postdot_id = $grammar_c->_marpa_g_ahm_postdot($item_id);
my $text = "AHM $item_id: ";
my @properties = ();
if ( $postdot_id < 0 ) {
push @properties, 'completion';
}
else {
my $postdot_symbol_name = $self->isy_name($postdot_id);
push @properties, qq{postdot = "$postdot_symbol_name"};
}
$text .= join q{; }, @properties;
$text .= "\n" . ( q{ } x 4 );
$text .= $self->show_brief_ahm($item_id) . "\n";
return $text;
} ## end sub show_ahm
sub show_brief_ahm {
my ( $self, $item_id ) = @_;
my $grammar_c = $self->{g};
my $postdot_id = $grammar_c->_marpa_g_ahm_postdot($item_id);
my $irl_id = $grammar_c->_marpa_g_ahm_irl($item_id);
my $position = $grammar_c->_marpa_g_ahm_position($item_id);
return $self->show_dotted_irl( $irl_id, $position );
} ## end sub show_brief_ahm
sub show_ahms {
my ($self) = @_;
my $grammar_c = $self->{g};
my $text = q{};
my $count = $grammar_c->_marpa_g_ahm_count();
for my $AHFA_item_id ( 0 .. $count - 1 ) {
$text .= $self->show_ahm($AHFA_item_id);
}
return $text;
} ## end sub show_ahms
sub isy_name {
my ( $self, $id ) = @_;
my $grammar_c = $self->{g};
# The next is a little roundabout to prevent auto-instantiation
my $name = '[ISY' . $id . ']';
GEN_NAME: {
if ( $grammar_c->_marpa_g_nsy_is_start($id) ) {
my $source_id = $grammar_c->_marpa_g_source_xsy($id);
$name = $self->symbol_name($source_id);
$name .= q<[']>;
last GEN_NAME;
} ## end if ( $grammar_c->_marpa_g_nsy_is_start($id) )
my $lhs_xrl = $grammar_c->_marpa_g_nsy_lhs_xrl($id);
if ( defined $lhs_xrl and defined $grammar_c->sequence_min($lhs_xrl) )
{
my $original_lhs_id = $grammar_c->rule_lhs($lhs_xrl);
$name = $self->symbol_name($original_lhs_id) . '[Seq]';
last GEN_NAME;
} ## end if ( defined $lhs_xrl and defined $grammar_c->sequence_min...)
my $xrl_offset = $grammar_c->_marpa_g_nsy_xrl_offset($id);
if ($xrl_offset) {
my $original_lhs_id = $grammar_c->rule_lhs($lhs_xrl);
$name =
$self->symbol_name($original_lhs_id) . '[R'
. $lhs_xrl . q{:}
. $xrl_offset . ']';
last GEN_NAME;
} ## end if ($xrl_offset)
my $source_id = $grammar_c->_marpa_g_source_xsy($id);
$name = $self->symbol_name($source_id);
$name .= '[]' if $grammar_c->_marpa_g_nsy_is_nulling($id);
} ## end GEN_NAME:
return $name;
} ## end sub isy_name
sub show_rule {
my ( $self, $rule_id ) = @_;
my $grammar = $self->{g};
my @comment = ();
$grammar->rule_length($rule_id) == 0 and push @comment, 'empty';
$grammar->rule_is_productive($rule_id) or push @comment, 'unproductive';
$grammar->rule_is_accessible($rule_id) or push @comment, 'inaccessible';
my $text = $self->brief_rule($rule_id);
if (@comment) {
$text .= q{ } . ( join q{ }, q{/*}, @comment, q{*/} );
}
return $text .= "\n";
} # sub show_rule
sub show_rules {
my ($self) = @_;
my $grammar = $self->{g};
my $text;
my $highest_rule_id = $grammar->highest_rule_id();
RULE:
for ( my $rule_id = 0; $rule_id <= $highest_rule_id; $rule_id++ ) {
$text .= $self->show_rule($rule_id);
}
return $text;
} ## end sub show_rules
1;
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