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package Spp::ToSpp; |
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use 5.012; |
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no warnings "experimental"; |
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use Exporter; |
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our @ISA = qw(Exporter); |
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our @EXPORT = qw(ast_to_spp); |
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use Spp::Builtin qw(to_json clean_ast); |
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use Spp::Estr qw(to_estr atoms flat); |
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sub ast_to_spp { |
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my $ast = shift; |
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my $estr = to_estr(to_json(clean_ast($ast))); |
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# say $estr; |
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# say from_estr($estr); |
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my @strs = (); |
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for my $spec (atoms($estr)) { |
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my ($name, $rule) = flat($spec); |
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my $rule_str = atom_to_spp($rule); |
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push @strs, "$name = $rule_str"; |
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} |
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3
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return join(';', @strs); |
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} |
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sub map_atoms { |
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my $atoms = shift; |
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return map { atom_to_spp($_) } atoms($atoms); |
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} |
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sub atoms_to_spp { |
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my $atoms = shift; |
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return join('', map_atoms($atoms)); |
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} |
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sub atom_to_spp { |
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my $rule = shift; |
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my ($name, $value) = flat($rule); |
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given ($name) { |
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when ('Rules') { return rules_to_spp($value) } |
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7
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when ('Group') { return group_to_spp($value) } |
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7
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when ('Branch') { return branch_to_spp($value) } |
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7
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when ('Rept') { return rept_to_spp($value) } |
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when ('Look') { return look_to_spp($value) } |
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when ('Char') { return char_to_spp($value) } |
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when ("Cclass") { return cclass_to_spp($value) } |
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when ("Cchar") { return char_to_spp($value) } |
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4
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when ("Chclass") { return chclass_to_spp($value) } |
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when ("Nchclass") { return nchclass_to_spp($value) } |
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when ("Range") { return range_to_spp($value) } |
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when ('Str') { return str_to_spp($value) } |
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when ('Not') { return not_to_spp($value) } |
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4
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when ('Till') { return till_to_spp($value) } |
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when ("Expr") { return expr_to_spp($value) } |
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when ("Array") { return array_to_spp($value) } |
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default { return $value } |
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} |
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} |
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sub rules_to_spp { |
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my $rules = shift; |
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return join(' ', map_atoms($rules)); |
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} |
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sub group_to_spp { |
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my $rule = shift; |
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return "{" . rules_to_spp($rule) . "}"; |
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} |
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sub branch_to_spp { |
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my $branch = shift; |
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return "|" . rules_to_spp($branch) . "|"; |
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} |
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sub rept_to_spp { |
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my $rule = shift; |
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my ($rept, $atom) = flat($rule); |
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1
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return atom_to_spp($atom) . $rept; |
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} |
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sub look_to_spp { |
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my $rule = shift; |
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my ($rept, $atom_look) = flat($rule); |
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my ($atom, $look) = flat($atom_look); |
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my $atom_spp = atom_to_spp($atom); |
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0
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my $look_spp = atom_to_spp($look); |
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return $atom_spp . $rept . $look_spp; |
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} |
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91
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sub chclass_to_spp { |
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my $atoms = shift; |
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return "[" . atoms_to_spp($atoms) . "]"; |
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} |
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96
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sub nchclass_to_spp { |
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my $atoms = shift; |
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return "[^" . atoms_to_spp($atoms) . "]"; |
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} |
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101
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sub str_to_spp { |
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0
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my $str = shift; |
103
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return "'" . $str . "'"; |
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} |
105
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106
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sub cclass_to_spp { |
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2
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my $cclass = shift; |
108
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2
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9
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return "\\" . $cclass; |
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} |
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111
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sub char_to_spp { |
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my $char = shift; |
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given ($char) { |
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when ('"') { return '\\"' } |
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115
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when ("\n") { return '\n' } |
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116
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when ("\r") { return '\r' } |
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117
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when ("\t") { return '\t' } |
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118
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when ("'") { return "\\'" } |
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119
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default { return "'$char'" } |
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120
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} |
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} |
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123
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sub till_to_spp { |
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0
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0
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my $rule = shift; |
125
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0
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return '~' . atom_to_spp($rule); |
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} |
127
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128
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sub not_to_spp { |
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0
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0
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my $rule = shift; |
130
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0
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return '!' . atom_to_spp($rule); |
131
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} |
132
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133
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sub range_to_spp { |
134
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0
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my $range = shift; |
135
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0
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return join('-', atoms($range)); |
136
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} |
137
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138
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sub expr_to_spp { |
139
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0
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0
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0
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my $expr = shift; |
140
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0
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return "(" . rules_to_spp($expr) . ")"; |
141
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} |
142
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143
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sub array_to_spp { |
144
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0
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0
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my $expr = shift; |
145
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0
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return "[" . rules_to_spp($expr) . "]"; |
146
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} |
147
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148
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1; |