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#Copyright 2008-10 Arthur S Goldstein |
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package Parse::Stallion::EBNF; |
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27882
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use Carp; |
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329
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24
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use strict; |
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8
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4
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164
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6
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20
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use warnings; |
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9
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289
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1268
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use Parse::Stallion; |
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4
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21815
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8
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our $VERSION='0.7'; |
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10
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sub ebnf { |
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0
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796
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shift; |
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my $parser = shift; |
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my @queue; |
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11
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unshift @queue, keys %{$parser->{rule}}; |
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171
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5
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my $start_rule = $parser->{start_rule}; |
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unshift @queue, $start_rule; |
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19
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my $results; |
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my %covered; |
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5
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25
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while (my $rule = shift @queue) { |
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1018
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100
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3251
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if (!$covered{$rule}++) { |
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422
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621
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$results .= "$rule = "; |
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422
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100
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1983
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if ($parser->{rule}->{$rule}->{rule_type} eq 'MULTIPLE') { |
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100
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100
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50
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25
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50
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105
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my $min = $parser->{rule}->{$rule}->{minimum_child}; |
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278
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my $max = $parser->{rule}->{$rule}->{maximum_child}; |
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100
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100
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199
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if ($min == 0 && $max == 1) { |
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45
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$results .= "[ "; |
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36
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$results .= $parser->{rule}->{$rule}->{subrule_list}->[0]->{name}; |
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36
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233
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$results .= " ]"; |
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} |
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else { |
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14
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$results .= "{ "; |
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$results .= $parser->{rule}->{$rule}->{subrule_list}->[0]->{name}; |
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14
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100
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66
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65
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if ($min != 0 || $max != 0) { |
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4
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$results .= "($min, $max)"; |
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} |
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$results .= " }"; |
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} |
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} |
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elsif ($parser->{rule}->{$rule}->{rule_type} eq 'AND') { |
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433
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1203
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$results .= join (" , ", |
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145
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158
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map {$_->{name}} @{$parser->{rule}->{$rule}->{subrule_list}}); |
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343
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44
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} |
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elsif ($parser->{rule}->{$rule}->{rule_type} eq 'OR') { |
46
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108
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237
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$results .= join (" | ", |
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28
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40
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map {$_->{name}} @{$parser->{rule}->{$rule}->{subrule_list}}); |
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75
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48
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} |
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elsif ($parser->{rule}->{$rule}->{rule_type} eq 'LEAF') { |
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199
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100
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507
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if (defined $parser->{rule}->{$rule}->{leaf_display}) { |
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179
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413
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$results .= $parser->{rule}->{$rule}->{leaf_display}; |
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} |
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} |
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else { |
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0
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0
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croak "Rule $rule unknown type ".$parser->{rule}->{$rule}->{rule_type}; |
56
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} |
57
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422
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50
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1136
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if ($parser->{rule}->{$rule}->{subrule_list}) { |
58
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422
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411
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my @new_rules; |
59
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422
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406
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foreach my $subrule (@{$parser->{rule}->{$rule}->{subrule_list}}) { |
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422
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1146
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60
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591
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1009
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push @new_rules, $subrule->{name}; |
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} |
62
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422
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1098
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unshift @queue, @new_rules; |
63
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} |
64
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422
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50
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1088
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if ($parser->{rule}->{$rule}->{minimize_children}) { |
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0
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0
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$results .= ' -MATCH_MIN_FIRST- '; |
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} |
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422
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100
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989
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if ($parser->{rule}->{$rule}->{parsing_evaluation}) { |
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104
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165
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$results .= ' -EVALUATION- '; |
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} |
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422
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50
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5628
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if ($parser->{rule}->{$rule}->{parsing_unevaluation}) { |
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0
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0
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$results .= ' -UNEVALUATION- '; |
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} |
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422
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50
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918
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if ($parser->{rule}->{$rule}->{use_string_match}) { |
74
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0
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0
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$results .= ' -USE_STRING_MATCH- '; |
75
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} |
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422
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50
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862
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if ($parser->{rule}->{$rule}->{match_once}) { |
77
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0
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0
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$results .= ' -MATCH_ONCE- '; |
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} |
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422
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50
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813
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if ($parser->{rule_info}->{$rule}) { |
80
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0
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0
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$results .= ' -RULE_INFO- '; |
81
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} |
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422
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1393
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$results .= " ;\n"; |
83
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} |
84
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} |
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5
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134
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return $results; |
86
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} |
87
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88
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my %ebnf_rules = ( |
89
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ebnf_rule_list => A(L(PF(sub{$_[0]->{parse_hash}->{max_position} = 0; |
90
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return 1, undef, 0})), 'some_white_space', |
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M(A(O('rule','failed_rule'),'some_white_space')), |
92
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E(sub { |
93
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my $parse_hash = $_[3]; |
94
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my $any_errors = 0; |
95
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$parse_hash->{errors} = []; |
96
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if ($_[0]->{failed_rule}) { |
97
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push @{$parse_hash->{errors}}, @{$_[0]->{failed_rule}}; |
98
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$any_errors = 1; |
99
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} |
100
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foreach my $rule (@{$_[0]->{rule}}) { |
101
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if ($rule->{error}) { |
102
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push @{$parse_hash->{errors}}, $rule->{error}; |
103
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$any_errors = 1; |
104
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} |
105
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} |
106
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if ($any_errors) {croak join("\n",@{$parse_hash->{errors}})} |
107
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return $_[0]->{rule};})), |
108
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rule => |
109
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A('rule_name', 'some_white_space', qr/\=/, 'some_white_space', |
110
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'rule_def', 'some_white_space', qr /\;/, |
111
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E(sub { |
112
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return {rule_name => $_[0]->{rule_name}, |
113
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rule_definition => $_[0]->{rule_def}}})), |
114
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real_white_space => A(qr/\s/, 'some_white_space'), |
115
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some_white_space => A(L(PF( |
116
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sub {my $parameters = shift; |
117
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my $cv = $parameters->{current_position}; |
118
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my $ph = $parameters->{parse_hash}; |
119
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if ($ph->{max_position} < $cv) { |
120
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$ph->{max_position} = $cv; |
121
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} |
122
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return 1, undef, 0; |
123
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})), O( |
124
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A(qr/\s*\#/, 'comment', 'some_white_space'), |
125
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qr/\s*/, |
126
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)), |
127
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rule_def => |
128
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O( |
129
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A(qr/\(/, 'some_white_space', 'the_rule', 'some_white_space', qr/\)/, |
130
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Z(A('some_white_space', 'eval_subroutine'))), |
131
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A('the_rule'), |
132
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E(sub { |
133
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my $the_rule = $_[0]->{the_rule}; |
134
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my $rule_def; |
135
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if ($_[0]->{eval_subroutine}->{sub}) { |
136
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push @{$the_rule->{elements}}, $_[0]->{eval_subroutine}->{sub}; |
137
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} |
138
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if ($the_rule->{rule_type} eq 'AND') { |
139
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$rule_def = A(@{$the_rule->{elements}}); |
140
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} |
141
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elsif ($the_rule->{rule_type} eq 'OR') { |
142
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$rule_def = O(@{$the_rule->{elements}}); |
143
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} |
144
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elsif ($the_rule->{rule_type} eq 'LEAF') { |
145
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$rule_def = L(@{$the_rule->{elements}}); |
146
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} |
147
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elsif ($the_rule->{rule_type} eq 'MULTIPLE') { |
148
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$rule_def = M(@{$the_rule->{elements}}); |
149
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} |
150
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elsif ($the_rule->{rule_type} eq 'OPTIONAL') { |
151
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$rule_def = Z(@{$the_rule->{elements}}); |
152
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} |
153
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return $rule_def})), |
154
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the_rule => O('leaf', 'quote', 'pf_pb', 'multiple', 'optional', 'and', 'or'), |
155
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comment => qr/[^\n]*/, |
156
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failed_rule => A( |
157
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L(PF(sub {${$_[0]->{__current_node_ref}}->{error_position} = |
158
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$_[0]->{parse_hash}->{max_position}; |
159
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my $new_position = $_[0]->{current_position}; |
160
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if ($new_position < $_[0]->{parse_hash}->{max_position}) { |
161
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$new_position = $_[0]->{parse_hash}->{max_position}; |
162
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} |
163
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return 1, undef, 0;})), |
164
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qr/[^;]*\;/, |
165
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E(sub {my (undef, $parameters) = @_; |
166
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my $text = $parameters->{parse_this_ref}; |
167
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my $pos = $parameters->{current_node}->{error_position} || 0; |
168
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my ($line, $position) = LOCATION($text, $pos); |
169
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my $before_length = 10; |
170
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my $before_start = $pos - 10; |
171
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if ($pos < 10) { |
172
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$before_length = $pos; |
173
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$before_start = 0; |
174
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} |
175
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my $before = substr($$text, $before_start, $before_length); |
176
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$before =~ s/.*\s(.+)/$1/; |
177
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my $after = substr($$text, $pos, 10); |
178
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$after =~ s/(.+?)\s(.*)/$1/; |
179
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return "Error at line $line tab stop $position near '$before".$after."'"; |
180
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})), |
181
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and => A( 'element' , |
182
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M(A('real_white_space', 'element')), |
183
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E(sub { |
184
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return {rule_type => 'AND', elements => $_[0]->{element}};})), |
185
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element => A(Z(A({alias=>'rule_name'}, qr/\./)), 'sub_element', |
186
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E( sub { |
187
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if (defined $_[0]->{alias}) { |
188
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return {$_[0]->{alias} => $_[0]->{sub_element}} |
189
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} |
190
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return $_[0]->{sub_element}})), |
191
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sub_element => O('rule_name', 'sub_rule', |
192
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'optional_sub_rule', |
193
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'multiple_sub_rule', 'leaf_sub_rule', 'pf_pb_subrule', 'quote_sub_rule', |
194
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'use_string_match', 'match_once', 'match_min_first'), |
195
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use_string_match => L(qr/\=SM/, |
196
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E(sub {return USE_STRING_MATCH})), |
197
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match_once => L(qr/\=MO/, |
198
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E(sub {return MATCH_ONCE})), |
199
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match_min_first => L(qr/\=MMF/, |
200
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E(sub {return MATCH_MIN_FIRST})), |
201
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optional_sub_rule => A( qr/\[/, 'some_white_space', |
202
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'rule_def', 'some_white_space', qr/\]/i, |
203
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E(sub { |
204
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return Z($_[0]->{rule_def});})), |
205
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multiple_sub_rule => A( qr/\{/, |
206
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'some_white_space', 'rule_def', 'some_white_space', qr/\}/, |
207
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Z('use_min_first'), Z('min_max'), |
208
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E(sub { |
209
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my $min = 0; |
210
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my $max = 0; |
211
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if ($_[0]->{min_max}) { |
212
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$min = $_[0]->{min_max}->{min}; |
213
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$max = $_[0]->{min_max}->{max}; |
214
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} |
215
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if ($_[0]->{use_min_first}) { |
216
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return M($_[0]->{rule_def},$min,$max, MATCH_MIN_FIRST()); |
217
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} |
218
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return M($_[0]->{rule_def},$min,$max);} |
219
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)), |
220
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sub_rule => A( qr/\(/, 'some_white_space', 'rule_def', 'some_white_space', |
221
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qr/\)/, |
222
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E(sub { return $_[0]->{rule_def};}) |
223
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), |
224
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rule_name => qr/[a-zA-Z]\w*/, |
225
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or => A( 'element' , M(A('some_white_space', qr/\|/, 'some_white_space', |
226
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'element'), 1, 0), |
227
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E(sub {return {rule_type => 'OR', elements => $_[0]->{element}}})), |
228
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multiple => A( qr/\{/, 'some_white_space', |
229
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'element', 'some_white_space', qr/\}/, Z('use_min_first'), |
230
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Z('min_max'), |
231
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E(sub { |
232
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my $min = 0; |
233
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my $max = 0; |
234
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if ($_[0]->{min_max}) { |
235
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|
$min = $_[0]->{min_max}->{min}; |
236
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$max = $_[0]->{min_max}->{max}; |
237
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} |
238
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|
if ($_[0]->{use_min_first}) { |
239
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return {rule_type => 'MULTIPLE', |
240
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|
elements => [$_[0]->{element},$min,$max, MATCH_MIN_FIRST()]}; |
241
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} |
242
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return {rule_type => 'MULTIPLE', elements => [$_[0]->{element},$min,$max]} |
243
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})), |
244
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min_max => A(qr/\*/,{min=>qr/\d+/},qr/\,/,{max=>qr/\d+/}), |
245
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|
use_min_first => qr/\?/, |
246
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optional => A( qr/\[/, 'some_white_space', |
247
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|
'element', 'some_white_space', qr/\]/, |
248
|
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|
E(sub { |
249
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|
return {rule_type => 'OPTIONAL', elements => [$_[0]->{element}]} |
250
|
|
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})), |
251
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quote_sub_rule => A( O(A(qr/q/i, qr/[^\w\s]/), qr/(\"|\')/), 'leaf_info', |
252
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|
E(sub {my $li = $_[0]->{leaf_info}; substr($li, -1) = ''; |
253
|
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|
$li =~ s/(\W)/\\$1/g; |
254
|
|
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|
return L(qr/$li/)})), |
255
|
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|
quote => A( O(A(qr/q/i, qr/[^\w\s]/,), qr/(\"|\')/), 'leaf_info', |
256
|
|
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|
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|
E(sub {my $li = $_[0]->{leaf_info}; substr($li, -1) = ''; |
257
|
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|
|
|
|
$li =~ s/(\W)/\\$1/g; |
258
|
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|
|
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|
return {rule_type => 'LEAF', elements => [qr/$li/]}})), |
259
|
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|
leaf_sub_rule => A( qr/qr/i, qr/[^\w\s]/, 'leaf_info', |
260
|
|
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|
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|
|
E(sub {my $li = $_[0]->{leaf_info}; substr($li, -1) = ''; |
261
|
|
|
|
|
|
|
return L(qr/$li/)})), |
262
|
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|
|
leaf => A( qr/qr/, qr/[^\w\s]/, 'leaf_info', |
263
|
|
|
|
|
|
|
Z({modifiers=>qr/\w+/}), |
264
|
|
|
|
|
|
|
E(sub {my $li = $_[0]->{leaf_info}; substr($li, -1) = ''; |
265
|
|
|
|
|
|
|
if (defined $_[0]->{modifiers}) { |
266
|
|
|
|
|
|
|
$li = '(?' . $_[0]->{modifiers}. ')'.$li |
267
|
|
|
|
|
|
|
} |
268
|
|
|
|
|
|
|
return {rule_type => 'LEAF', elements => [qr/$li/]}})), |
269
|
|
|
|
|
|
|
leaf_info => L(PF( |
270
|
|
|
|
|
|
|
sub {my $parameters = shift; |
271
|
|
|
|
|
|
|
my $in_ref = $parameters->{parse_this_ref}; |
272
|
|
|
|
|
|
|
my $pos = $parameters->{current_position}; |
273
|
|
|
|
|
|
|
my $previous = substr($$in_ref, $pos-1, 1); |
274
|
|
|
|
|
|
|
pos $$in_ref = $pos; |
275
|
|
|
|
|
|
|
if ($$in_ref =~ /\G([^$previous]+$previous)/) { |
276
|
|
|
|
|
|
|
return 1, $1, length($1); |
277
|
|
|
|
|
|
|
} |
278
|
|
|
|
|
|
|
else { |
279
|
|
|
|
|
|
|
return 0; |
280
|
|
|
|
|
|
|
} |
281
|
|
|
|
|
|
|
} |
282
|
|
|
|
|
|
|
)), |
283
|
|
|
|
|
|
|
pf_pb_subrule => A('parse_forward', |
284
|
|
|
|
|
|
|
Z(A('some_white_space', 'parse_backtrack')), |
285
|
|
|
|
|
|
|
E (sub { |
286
|
|
|
|
|
|
|
if ($_[0]->{parse_backtrack}) { |
287
|
|
|
|
|
|
|
return L(PF($_[0]->{parse_forward}), |
288
|
|
|
|
|
|
|
PB($_[0]->{parse_backtrack})); |
289
|
|
|
|
|
|
|
}; |
290
|
|
|
|
|
|
|
return L(PF($_[0]->{parse_forward})); |
291
|
|
|
|
|
|
|
} |
292
|
|
|
|
|
|
|
)), |
293
|
|
|
|
|
|
|
pf_pb => A('parse_forward', Z(A('some_white_space', 'parse_backtrack')), |
294
|
|
|
|
|
|
|
E(sub { |
295
|
|
|
|
|
|
|
if ($_[0]->{parse_backtrack}) { |
296
|
|
|
|
|
|
|
return {rule_type => 'LEAF', elements => [ |
297
|
|
|
|
|
|
|
PF($_[0]->{parse_forward}), |
298
|
|
|
|
|
|
|
PB($_[0]->{parse_backtrack}), |
299
|
|
|
|
|
|
|
]}; |
300
|
|
|
|
|
|
|
} |
301
|
|
|
|
|
|
|
return {rule_type => 'LEAF', elements => [ |
302
|
|
|
|
|
|
|
PF($_[0]->{parse_forward}), |
303
|
|
|
|
|
|
|
]}; |
304
|
|
|
|
|
|
|
})), |
305
|
|
|
|
|
|
|
quote_sub_rule => A( O(A(qr/q/i, qr/[^\w\s]/), qr/(\"|\')/), 'leaf_info', |
306
|
|
|
|
|
|
|
E(sub {my $li = $_[0]->{leaf_info}; substr($li, -1) = ''; |
307
|
|
|
|
|
|
|
$li =~ s/(\W)/\\$1/g; |
308
|
|
|
|
|
|
|
return L(qr/$li/)})), |
309
|
|
|
|
|
|
|
quote => A( O(A(qr/q/i, qr/[^\w\s]/,), qr/(\"|\')/), 'leaf_info', |
310
|
|
|
|
|
|
|
E(sub {my $li = $_[0]->{leaf_info}; substr($li, -1) = ''; |
311
|
|
|
|
|
|
|
$li =~ s/(\W)/\\$1/g; |
312
|
|
|
|
|
|
|
return {rule_type => 'LEAF', elements => [qr/$li/]}})), |
313
|
|
|
|
|
|
|
parse_backtrack => A( qr/B[^\w\s]/, 'sub_routine', |
314
|
|
|
|
|
|
|
E(sub { |
315
|
|
|
|
|
|
|
my $routine = eval $_[0]->{sub_routine}->{the_sub}; |
316
|
|
|
|
|
|
|
if ($@) {croak $@}; |
317
|
|
|
|
|
|
|
return $routine;}) |
318
|
|
|
|
|
|
|
), |
319
|
|
|
|
|
|
|
parse_forward => A( qr/F[^\w\s]/, 'sub_routine', |
320
|
|
|
|
|
|
|
E(sub { |
321
|
|
|
|
|
|
|
my $routine = eval $_[0]->{sub_routine}->{the_sub}; |
322
|
|
|
|
|
|
|
if ($@) {croak $@}; |
323
|
|
|
|
|
|
|
return $routine;}) |
324
|
|
|
|
|
|
|
), |
325
|
|
|
|
|
|
|
eval_subroutine => A( qr/S[^\w\s]/, 'sub_routine', |
326
|
|
|
|
|
|
|
E(sub {return {'sub' => SE($_[0]->{'sub_routine'}->{the_sub}, |
327
|
|
|
|
|
|
|
'_matched_string')}}) |
328
|
|
|
|
|
|
|
), |
329
|
|
|
|
|
|
|
sub_routine => L(PARSE_FORWARD( |
330
|
|
|
|
|
|
|
sub {my $parameters = shift; |
331
|
|
|
|
|
|
|
my $in_ref = $parameters->{parse_this_ref}; |
332
|
|
|
|
|
|
|
my $pos = $parameters->{current_position}; |
333
|
|
|
|
|
|
|
my $previous = substr($$in_ref, $pos-1, 1); |
334
|
|
|
|
|
|
|
my $previous2 = substr($$in_ref, $pos-2, 1); |
335
|
|
|
|
|
|
|
pos $$in_ref = $pos; |
336
|
|
|
|
|
|
|
my $opposite; |
337
|
|
|
|
|
|
|
if ($previous eq '{') {$opposite = '}'}; |
338
|
|
|
|
|
|
|
if ($previous eq '[') {$opposite = ']'}; |
339
|
|
|
|
|
|
|
if (!defined $opposite) {return 0} |
340
|
|
|
|
|
|
|
if ($$in_ref =~ /\G(.*?$opposite($previous2))/s) { |
341
|
|
|
|
|
|
|
return 1, $1, length($1); |
342
|
|
|
|
|
|
|
} |
343
|
|
|
|
|
|
|
else { |
344
|
|
|
|
|
|
|
return 0; |
345
|
|
|
|
|
|
|
} |
346
|
|
|
|
|
|
|
}), |
347
|
|
|
|
|
|
|
E(sub { |
348
|
|
|
|
|
|
|
my $subroutine = shift; |
349
|
|
|
|
|
|
|
substr($subroutine, -2) = ''; |
350
|
|
|
|
|
|
|
return {the_sub => $subroutine}; |
351
|
|
|
|
|
|
|
} |
352
|
|
|
|
|
|
|
)) |
353
|
|
|
|
|
|
|
); |
354
|
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
our $ebnf_parser = new Parse::Stallion(\%ebnf_rules); |
356
|
|
|
|
|
|
|
foreach my $mn (keys %{$ebnf_parser->{rule}}) { |
357
|
|
|
|
|
|
|
if (!$ebnf_parser->{rule}->{$mn}->{rule_type}) { |
358
|
|
|
|
|
|
|
warn "name generated $mn\n"; |
359
|
|
|
|
|
|
|
} |
360
|
|
|
|
|
|
|
} |
361
|
|
|
|
|
|
|
|
362
|
4
|
|
|
4
|
|
69
|
use Parse::Stallion::EBNF; |
|
4
|
|
|
|
|
8
|
|
|
4
|
|
|
|
|
1292
|
|
363
|
|
|
|
|
|
|
my $ebnf_form = ebnf Parse::Stallion::EBNF($ebnf_parser); |
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
sub ebnf_new { |
366
|
26
|
|
|
26
|
0
|
18417
|
my $type = shift; |
367
|
26
|
|
|
|
|
61
|
my $rules_string = shift; |
368
|
|
|
|
|
|
|
#print STDERR "rule string is $rules_string\n"; |
369
|
|
|
|
|
|
|
# my @pt; |
370
|
26
|
|
|
|
|
49
|
my $rules_out = eval {$ebnf_parser->parse_and_evaluate( |
|
26
|
|
|
|
|
113
|
|
371
|
|
|
|
|
|
|
$rules_string |
372
|
|
|
|
|
|
|
# , {parse_trace => \@pt} |
373
|
|
|
|
|
|
|
)}; |
374
|
|
|
|
|
|
|
#use Data::Dumper;print STDERR "pt is ".Dumper(\@pt)."\n"; |
375
|
26
|
100
|
|
|
|
368
|
if ($@) {croak "\nUnable to create parser due to the following:\n$@\n"}; |
|
1
|
|
|
|
|
183
|
|
376
|
|
|
|
|
|
|
#use Data::Dumper;print STDERR "ro is ".Dumper($rules_out)."\n"; |
377
|
25
|
|
|
|
|
51
|
my %rules; |
378
|
25
|
|
|
|
|
66
|
foreach my $rule (@$rules_out) { |
379
|
72
|
|
|
|
|
152
|
my $rule_name = $rule->{rule_name}; |
380
|
72
|
100
|
|
|
|
198
|
if ($rules{$rule_name}) { |
381
|
1
|
|
|
|
|
229
|
croak "Unable to create parse: Duplicate rule name $rule_name\n"; |
382
|
|
|
|
|
|
|
} |
383
|
71
|
|
|
|
|
216
|
$rules{$rule_name} = $rule->{rule_definition}; |
384
|
|
|
|
|
|
|
} |
385
|
|
|
|
|
|
|
#use Data::Dumper;print STDERR "therules is ".Dumper(\%rules)."\n"; |
386
|
24
|
|
|
|
|
284
|
my $new_parser = new Parse::Stallion(\%rules, {separator => '.'}); |
387
|
24
|
|
|
|
|
312
|
return $new_parser; |
388
|
|
|
|
|
|
|
} |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
1; |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
__END__ |