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Stuifzand.pm
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Stuifzand.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::Stuifzand;
use 5.010;
use strict;
use warnings;
use vars qw($VERSION $STRING_VERSION);
$VERSION = '2.042000';
$STRING_VERSION = $VERSION;
## no critic(BuiltinFunctions::ProhibitStringyEval)
$VERSION = eval $VERSION;
## use critic
package Marpa::R2::Internal::Stuifzand::Symbol;
use constant NAME => 0;
use constant HIDE => 1;
sub new { my $class = shift; return bless { name => $_[NAME], is_hidden => ($_[HIDE]//0) }, $class }
sub name { return $_[0]->{name} }
sub names { return $_[0]->{name} }
sub is_hidden { return $_[0]->{is_hidden} }
sub hidden_set { $_[0]->{is_hidden} = 1; }
sub symbols { return $_[0]; }
package Marpa::R2::Internal::Stuifzand::Symbol_List;
sub new { my $class = shift; return bless [@_], $class }
sub names {
return map { $_->names() } @{ $_[0] };
}
sub is_hidden {
return map { $_->is_hidden() } @{ $_[0] };
}
sub hidden_set {
$_->hidden_set() for @ { $_[0] };
}
sub mask {
return map { $_ ? 0 : 1 } map { $_->is_hidden() } @{ $_[0] };
}
sub symbols {
return map { $_->symbols() } @{ $_[0] };
}
package Marpa::R2::Internal::Stuifzand;
use English qw( -no_match_vars );
# Internal names end in ']' and are distinguished by prefix.
#
# Suffixed with '[prec%d]' --
# a symbol created to implement precedence.
# Suffix is removed to restore 'original'.
#
# Prefixed with '[[' -- a character class
# These are their own 'original'.
#
# Prefixed with '[:' -- a reserved symbol, one which in the
# grammars start with a colon.
# These are their own 'original'.
# The names tend to be suggested by the corresponding
# symbols in Perl 6. Among them:
# [:$] -- end of input
# [:|w] -- word boundary
#
# Of the form '[Lex-42]' - where for '42' any other
# decimal number can be subsituted. Anonymous lexicals.
# These symbols are their own originals.
#
# Prefixed with '[SYMBOL#' - a unnamed internal symbol.
# Seeing these
# indicates some sort of internal error. If seen,
# they will be treated as their own original.
#
# Suffixed with '[Sep]' indicates an internal version
# of a sequence separator. These are their own
# original, because otherwise the "original" name
# would conflict with the LHS of the sequence.
#
# Undo any rewrite of the symbol name
sub Marpa::R2::Grammar::original_symbol_name {
$_[0] =~ s/\[ prec \d+ \] \z//xms;
return shift;
}
# This rule is used by the semantics of the *GENERATED*
# grammars, not the Stuifzand grammar itself.
sub external_do_arg0 {
return $_[1];
}
sub do_rules {
shift;
return [ map { @{$_} } @_ ];
}
sub do_start_rule {
my ( $self, $rhs ) = @_;
my $do_arg0 = __PACKAGE__ . q{::} . 'external_do_arg0';
return [
{ lhs => '[:start]',
rhs => [ $rhs->names() ],
action => $do_arg0,
mask => [1]
}
];
} ## end sub do_start_rule
sub do_discard_rule {
my ( $self, $rhs ) = @_;
my $thick_grammar = $self->{thick_grammar};
Marpa::R2::exception( ':discard not allowed unless grammar is scannerless');
} ## end sub do_discard_rule
sub do_priority_rule {
my ( $self, $lhs, $op_declare, $priorities ) = @_;
my $thick_grammar = $self->{thick_grammar};
my $priority_count = scalar @{$priorities};
my @rules = ();
my @xs_rules = ();
if ( $priority_count <= 1 ) {
## If there is only one priority
for my $alternative ( @{ $priorities->[0] } ) {
my ( $rhs, $adverb_list ) = @{$alternative};
my @rhs_names = $rhs->names();
my @mask = $rhs->mask();
my %hash_rule =
( lhs => $lhs, rhs => \@rhs_names, mask => \@mask );
my $action = $adverb_list->{action};
$hash_rule{action} = $action if defined $action;
push @xs_rules, \%hash_rule;
} ## end for my $alternative ( @{ $priorities->[0] } )
return [@xs_rules];
}
for my $priority_ix ( 0 .. $priority_count - 1 ) {
my $priority = $priority_count - ( $priority_ix + 1 );
for my $alternative ( @{ $priorities->[$priority_ix] } ) {
push @rules, [ $priority, @{$alternative} ];
}
} ## end for my $priority_ix ( 0 .. $priority_count - 1 )
state $do_arg0_full_name = __PACKAGE__ . q{::} . 'external_do_arg0';
# Default mask (all ones) is OK for this rule
@xs_rules = (
{ lhs => $lhs,
rhs => [ $lhs . '[prec0]' ],
action => $do_arg0_full_name
},
( map {
;
{ lhs => ( $lhs . '[prec' . ( $_ - 1 ) . ']'),
rhs => [ $lhs . '[prec' . $_ . ']'],
action => $do_arg0_full_name
}
} 1 .. $priority_count - 1
)
);
RULE: for my $rule (@rules) {
my ( $priority, $rhs, $adverb_list ) = @{$rule};
my $assoc = $adverb_list->{assoc} // 'L';
my @new_rhs = $rhs->names();
my @arity = grep { $new_rhs[$_] eq $lhs } 0 .. $#new_rhs;
my $length = scalar @new_rhs;
my $current_exp = $lhs . '[prec' . $priority . ']';
my %new_xs_rule = (lhs => $current_exp);
$new_xs_rule{mask} = [$rhs->mask()];
my $action = $adverb_list->{action};
$new_xs_rule{action} = $action if defined $action;
my $next_priority = $priority + 1;
$next_priority = 0 if $next_priority >= $priority_count;
my $next_exp = $lhs . '[prec' . $next_priority . ']';
if ( not scalar @arity ) {
$new_xs_rule{rhs} = \@new_rhs;
push @xs_rules, \%new_xs_rule;
next RULE;
}
if ( scalar @arity == 1 ) {
die 'Unnecessary unit rule in priority rule' if $length == 1;
$new_rhs[ $arity[0] ] = $current_exp;
}
DO_ASSOCIATION: {
if ( $assoc eq 'L' ) {
$new_rhs[ $arity[0] ] = $current_exp;
for my $rhs_ix ( @arity[ 1 .. $#arity ] ) {
$new_rhs[$rhs_ix] = $next_exp;
}
last DO_ASSOCIATION;
} ## end if ( $assoc eq 'L' )
if ( $assoc eq 'R' ) {
$new_rhs[ $arity[-1] ] = $current_exp;
for my $rhs_ix ( @arity[ 0 .. $#arity - 1 ] ) {
$new_rhs[$rhs_ix] = $next_exp;
}
last DO_ASSOCIATION;
} ## end if ( $assoc eq 'R' )
if ( $assoc eq 'G' ) {
for my $rhs_ix ( @arity[ 0 .. $#arity ] ) {
$new_rhs[$rhs_ix] = $lhs . '[prec0]';
}
last DO_ASSOCIATION;
} ## end if ( $assoc eq 'G' )
die qq{Unknown association type: "$assoc"};
} ## end DO_ASSOCIATION:
$new_xs_rule{rhs} = \@new_rhs;
push @xs_rules, \%new_xs_rule;
} ## end RULE: for my $rule (@rules)
return [@xs_rules];
} ## end sub do_priority_rule
sub do_empty_rule {
my ( undef, $lhs, undef, $adverb_list ) = @_;
my $action = $adverb_list->{action};
# mask not needed
return [ { lhs => $lhs, rhs => [], defined($action) ? (action => $action) : () } ];
}
sub do_quantified_rule {
my ( $self, $lhs, $op_declare, $rhs, $quantifier, $adverb_list ) = @_;
my $thick_grammar = $self->{thick_grammar};
# Some properties of the sequence rule will not be altered
# no matter how complicated this gets
my %sequence_rule = (
rhs => [ $rhs->name() ],
min => ( $quantifier eq q{+} ? 1 : 0 )
);
my $action = $adverb_list->{action};
$sequence_rule{action} = $action if defined $action;
my @rules = ( \%sequence_rule );
my $original_separator = $adverb_list->{separator};
# mask not needed
$sequence_rule{lhs} = $lhs;
$sequence_rule{separator} = $original_separator
if defined $original_separator;
my $proper = $adverb_list->{proper};
$sequence_rule{proper} = $proper if defined $proper;
return \@rules;
} ## end sub do_quantified_rule
sub create_hidden_internal_symbol {
my ($self, $symbol_name) = @_;
$self->{needs_symbol}->{$symbol_name} = 1;
my $symbol = Marpa::R2::Internal::Stuifzand::Symbol->new($symbol_name);
$symbol->hidden_set();
return $symbol;
}
sub do_any {
Marpa::R2::exception( ':any not allowed unless grammar is scannerless');
}
sub do_ws {
Marpa::R2::exception( ':ws not allowed unless grammar is scannerless');
}
sub do_ws_star {
Marpa::R2::exception( ':ws* not allowed unless grammar is scannerless');
}
sub do_ws_plus {
Marpa::R2::exception( ':ws+ not allowed unless grammar is scannerless');
}
sub do_symbol {
shift;
return Marpa::R2::Internal::Stuifzand::Symbol->new( $_[0] );
}
sub do_character_class {
Marpa::R2::exception( 'character classes not allowed unless grammar is scannerless');
} ## end sub do_character_class
sub do_rhs_primary_list { shift; return Marpa::R2::Internal::Stuifzand::Symbol_List->new(@_) }
sub do_lhs { shift; return $_[0]; }
sub do_rhs {
shift;
return Marpa::R2::Internal::Stuifzand::Symbol_List->new(
map { $_->symbols() } @_ );
}
sub do_adverb_list { shift; return { map {; @{$_}} @_ } }
sub do_parenthesized_rhs_primary_list {
my (undef, $list) = @_;
$list->hidden_set();
return $list;
} ## end sub do_parenthesized_symbol_list
sub do_separator_specification {
my (undef, $separator) = @_;
return [ separator => $separator->name() ];
}
sub do_single_quoted_string {
Marpa::R2::exception( 'quoted strings not allowed unless grammar is scannerless');
}
sub do_op_declare_bnf { return q{::=} }
sub do_op_declare_match { return q{~} }
sub do_op_star_quantifier { return q{*} }
sub do_op_plus_quantifier { return q{+} }
my %hashed_closures = (
do_adverb_list => \&do_adverb_list,
do_any => \&do_any,
do_character_class => \&do_character_class,
do_discard_rule => \&do_discard_rule,
do_empty_rule => \&do_empty_rule,
do_lhs => \&do_lhs,
do_op_declare_bnf => \&do_op_declare_bnf,
do_op_declare_match => \&do_op_declare_match,
do_op_plus_quantifier => \&do_op_plus_quantifier,
do_op_star_quantifier => \&do_op_star_quantifier,
do_parenthesized_rhs_primary_list => \&do_parenthesized_rhs_primary_list,
do_priority_rule => \&do_priority_rule,
do_quantified_rule => \&do_quantified_rule,
do_rhs => \&do_rhs,
do_rules => \&do_rules,
do_separator_specification => \&do_separator_specification,
do_single_quoted_string => \&do_single_quoted_string,
do_start_rule => \&do_start_rule,
do_symbol => \&do_symbol,
do_rhs_primary_list => \&do_rhs_primary_list,
do_ws => \&do_ws,
do_ws_plus => \&do_ws_plus,
do_ws_star => \&do_ws_star,
);
sub meta_grammar {
my $hashed_metag;
## The code after this line was automatically generated by sl_to_hash.pl
## Date: Mon Dec 24 14:19:53 2012
$hashed_metag = {
'character_classes' => {
'[[\']]' => qr/(?msx-i:['])/,
'[[01]]' => qr/(?msx-i:[01])/,
'[[\\#]]' => qr/(?msx-i:[\#])/,
'[[\\(]]' => qr/(?msx-i:[\(])/,
'[[\\)]]' => qr/(?msx-i:[\)])/,
'[[\\*]]' => qr/(?msx-i:[\*])/,
'[[\\+]]' => qr/(?msx-i:[\+])/,
'[[\\:]]' => qr/(?msx-i:[\:])/,
'[[\\<]]' => qr/(?msx-i:[\<])/,
'[[\\=]]' => qr/(?msx-i:[\=])/,
'[[\\>]]' => qr/(?msx-i:[\>])/,
'[[\\[]]' => qr/(?msx-i:[\[])/,
'[[\\\\]]' => qr/(?msx-i:[\\])/,
'[[\\]]]' => qr/(?msx-i:[\]])/,
'[[\\s\\w]]' => qr/(?msx-i:[\s\w])/,
'[[\\s]]' => qr/(?msx-i:[\s])/,
'[[\\w]]' => qr/(?msx-i:[\w])/,
'[[\\x{A}\\x{B}\\x{C}\\x{D}\\x{2028}\\x{2029}]]' => qr/(?msx-i:[\x{A}\x{B}\x{C}\x{D}\x{2028}\x{2029}])/,
'[[\\|]]' => qr/(?msx-i:[\|])/,
'[[\\~]]' => qr/(?msx-i:[\~])/,
'[[^\'\\x{0A}\\x{0B}\\x{0C}\\x{0D}\\x{0085}\\x{2028}\\x{2029}]]' => qr/(?msx-i:[^'\x{0A}\x{0B}\x{0C}\x{0D}\x{0085}\x{2028}\x{2029}])/,
'[[^\\x{5d}\\x{0A}\\x{0B}\\x{0C}\\x{0D}\\x{0085}\\x{2028}\\x{2029}]]' => qr/(?msx-i:[^\x{5d}\x{0A}\x{0B}\x{0C}\x{0D}\x{0085}\x{2028}\x{2029}])/,
'[[^\\x{A}\\x{B}\\x{C}\\x{D}\\x{2028}\\x{2029}]]' => qr/(?msx-i:[^\x{A}\x{B}\x{C}\x{D}\x{2028}\x{2029}])/,
'[[a]]' => qr/(?msx-i:[a])/,
'[[c]]' => qr/(?msx-i:[c])/,
'[[d]]' => qr/(?msx-i:[d])/,
'[[e]]' => qr/(?msx-i:[e])/,
'[[f]]' => qr/(?msx-i:[f])/,
'[[g]]' => qr/(?msx-i:[g])/,
'[[h]]' => qr/(?msx-i:[h])/,
'[[i]]' => qr/(?msx-i:[i])/,
'[[l]]' => qr/(?msx-i:[l])/,
'[[n]]' => qr/(?msx-i:[n])/,
'[[o]]' => qr/(?msx-i:[o])/,
'[[p]]' => qr/(?msx-i:[p])/,
'[[r]]' => qr/(?msx-i:[r])/,
'[[s]]' => qr/(?msx-i:[s])/,
'[[t]]' => qr/(?msx-i:[t])/,
'[[u]]' => qr/(?msx-i:[u])/,
'[[w]]' => qr/(?msx-i:[w])/,
'[[y]]' => qr/(?msx-i:[y])/
},
'g1_rules' => [
{
'lhs' => '[:start]',
'rhs' => [
'rules'
]
},
{
'lhs' => 'action',
'mask' => [
0,
0,
1
],
'rhs' => [
'[Lex-2]',
'[Lex-3]',
'action name'
]
},
{
'lhs' => 'action name',
'mask' => [
1
],
'rhs' => [
'bare name'
]
},
{
'lhs' => 'adverb item',
'mask' => [
1
],
'rhs' => [
'action'
]
},
{
'lhs' => 'adverb item',
'mask' => [
1
],
'rhs' => [
'group association'
]
},
{
'lhs' => 'adverb item',
'mask' => [
1
],
'rhs' => [
'left association'
]
},
{
'lhs' => 'adverb item',
'mask' => [
1
],
'rhs' => [
'proper specification'
]
},
{
'lhs' => 'adverb item',
'mask' => [
1
],
'rhs' => [
'right association'
]
},
{
'lhs' => 'adverb item',
'mask' => [
1
],
'rhs' => [
'separator specification'
]
},
{
'lhs' => 'adverb list',
'min' => 0,
'rhs' => [
'adverb item'
]
},
{
'lhs' => 'alternative',
'mask' => [
1,
1
],
'rhs' => [
'rhs',
'adverb list'
]
},
{
'lhs' => 'alternatives',
'min' => 1,
'proper' => '1',
'rhs' => [
'alternative'
],
'separator' => 'op equal priority'
},
{
'lhs' => 'discard rule',
'mask' => [
0,
0,
1
],
'rhs' => [
'[Lex-1]',
'op declare match',
'single symbol'
]
},
{
'lhs' => 'empty rule',
'mask' => [
1,
1,
1
],
'rhs' => [
'lhs',
'op declare',
'adverb list'
]
},
{
'lhs' => 'group association',
'mask' => [
0,
0,
0
],
'rhs' => [
'[Lex-10]',
'[Lex-11]',
'[Lex-12]'
]
},
{
'lhs' => 'left association',
'mask' => [
0,
0,
0
],
'rhs' => [
'[Lex-4]',
'[Lex-5]',
'[Lex-6]'
]
},
{
'lhs' => 'lhs',
'mask' => [
1
],
'rhs' => [
'symbol name'
]
},
{
'lhs' => 'op declare',
'mask' => [
1
],
'rhs' => [
'op declare bnf'
]
},
{
'lhs' => 'op declare',
'mask' => [
1
],
'rhs' => [
'op declare match'
]
},
{
'lhs' => 'parenthesized rhs primary list',
'mask' => [
0,
1,
0
],
'rhs' => [
'[Lex-17]',
'rhs primary list',
'[Lex-18]'
]
},
{
'lhs' => 'priorities',
'min' => 1,
'proper' => '1',
'rhs' => [
'alternatives'
],
'separator' => 'op loosen'
},
{
'lhs' => 'priority rule',
'mask' => [
1,
1,
1
],
'rhs' => [
'lhs',
'op declare',
'priorities'
]
},
{
'lhs' => 'proper specification',
'mask' => [
0,
0,
1
],
'rhs' => [
'[Lex-15]',
'[Lex-16]',
'boolean'
]
},
{
'lhs' => 'quantified rule',
'mask' => [
1,
1,
1,
1,
1
],
'rhs' => [
'lhs',
'op declare',
'single symbol',
'quantifier',
'adverb list'
]
},
{
'lhs' => 'quantifier',
'mask' => [
1
],
'rhs' => [
'[Lex-19]'
]
},
{
'lhs' => 'quantifier',
'mask' => [
1
],
'rhs' => [
'[Lex-20]'
]
},
{
'lhs' => 'rhs',
'min' => 1,
'rhs' => [
'rhs primary'
]
},
{
'lhs' => 'rhs primary',
'mask' => [
1
],
'rhs' => [
'kwc any'
]
},
{
'lhs' => 'rhs primary',
'mask' => [
1
],
'rhs' => [
'kwc ws'
]
},
{
'lhs' => 'rhs primary',
'mask' => [
1
],
'rhs' => [
'kwc ws plus'
]
},
{
'lhs' => 'rhs primary',
'mask' => [
1
],
'rhs' => [
'kwc ws star'
]
},
{
'lhs' => 'rhs primary',
'mask' => [
1
],
'rhs' => [
'parenthesized rhs primary list'
]
},
{
'lhs' => 'rhs primary',
'mask' => [
1
],
'rhs' => [
'single quoted string'
]
},
{
'lhs' => 'rhs primary',
'mask' => [
1
],
'rhs' => [
'single symbol'
]
},
{
'lhs' => 'rhs primary list',
'min' => 1,
'rhs' => [
'rhs primary'
]
},
{
'lhs' => 'right association',
'mask' => [
0,
0,
0
],
'rhs' => [
'[Lex-7]',
'[Lex-8]',
'[Lex-9]'
]
},
{
'lhs' => 'rule',
'mask' => [
1
],
'rhs' => [
'discard rule'
]
},
{
'lhs' => 'rule',
'mask' => [
1
],
'rhs' => [
'empty rule'
]
},
{
'lhs' => 'rule',
'mask' => [
1
],
'rhs' => [
'priority rule'
]
},
{
'lhs' => 'rule',
'mask' => [
1
],
'rhs' => [
'quantified rule'
]
},
{
'lhs' => 'rule',
'mask' => [
1
],
'rhs' => [
'start rule'
]
},
{
'lhs' => 'rules',
'min' => 1,
'rhs' => [
'rule'
]
},
{
'lhs' => 'separator specification',
'mask' => [
0,
0,
1
],
'rhs' => [
'[Lex-13]',
'[Lex-14]',
'single symbol'
]
},
{
'lhs' => 'single symbol',
'mask' => [
1
],
'rhs' => [
'character class'
]
},
{
'lhs' => 'single symbol',
'mask' => [
1
],
'rhs' => [
'symbol'
]
},
{
'lhs' => 'start rule',
'mask' => [
0,
0,
1
],
'rhs' => [
'[Lex-0]',
'op declare bnf',
'symbol'
]
},
{
'lhs' => 'symbol',
'mask' => [
1
],
'rhs' => [
'symbol name'
]
},
{
'lhs' => 'symbol name',
'mask' => [
1
],
'rhs' => [
'bare name'
]
},
{
'lhs' => 'symbol name',
'mask' => [
1
],
'rhs' => [
'bracketed name'
]
}
],
'is_lexeme' => {
'[:discard]' => 1,
'[Lex-0]' => 1,
'[Lex-10]' => 1,
'[Lex-11]' => 1,
'[Lex-12]' => 1,
'[Lex-13]' => 1,
'[Lex-14]' => 1,
'[Lex-15]' => 1,
'[Lex-16]' => 1,
'[Lex-17]' => 1,
'[Lex-18]' => 1,
'[Lex-19]' => 1,
'[Lex-1]' => 1,
'[Lex-20]' => 1,
'[Lex-2]' => 1,
'[Lex-3]' => 1,
'[Lex-4]' => 1,
'[Lex-5]' => 1,
'[Lex-6]' => 1,
'[Lex-7]' => 1,
'[Lex-8]' => 1,
'[Lex-9]' => 1,
'bare name' => 1,
'boolean' => 1,
'bracketed name' => 1,
'character class' => 1,
'kwc any' => 1,
'kwc ws' => 1,
'kwc ws plus' => 1,
'kwc ws star' => 1,
'op declare bnf' => 1,
'op declare match' => 1,
'op equal priority' => 1,
'op loosen' => 1,
'single quoted string' => 1
},
'lex_rules' => [
{
'lhs' => '[:discard]',
'rhs' => [
'hash comment'
]
},
{
'lhs' => '[:discard]',
'rhs' => [
'whitespace'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[:discard]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-0]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-10]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-11]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-12]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-13]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-14]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-15]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-16]'
]
},
{
'lhs' => '[:start_lex]',
'rhs' => [
'[Lex-17]'
]