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annotate perl-5.22.2/regen/regcharclass_multi_char_folds.pl @ 8045:a16537d2fe07

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<xfix> tar xf perl-5.22.2.tar.gz # Ah, whatever, I\'m doing it anyway
author HackBot
date Sat, 14 May 2016 14:54:38 +0000
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8045
a16537d2fe07 <xfix> tar xf perl-5.22.2.tar.gz # Ah, whatever, I\'m doing it anyway
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1 package regcharclass_multi_char_folds;
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2 use 5.015;
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3 use strict;
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4 use warnings;
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5 use Unicode::UCD "prop_invmap";
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6
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7 # This returns an array of strings of the form
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8 # "\x{foo}\x{bar}\x{baz}"
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9 # of the sequences of code points that are multi-character folds in the
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10 # current Unicode version. If the parameter is 1, all such folds are
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11 # returned. If the parameters is 0, only the ones containing exclusively
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12 # Latin1 characters are returned. In the latter case all combinations of
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13 # Latin1 characters that can fold to the base one are returned. Thus for
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14 # 'ss', it would return in addition, 'Ss', 'sS', and 'SS'. This is because
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15 # this code is designed to help regcomp.c, and EXACTFish regnodes. For
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16 # non-UTF-8 patterns, the strings are not folded, so we need to check for the
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17 # upper and lower case versions. For UTF-8 patterns, the strings are folded,
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18 # except in EXACTFL nodes) so we only need to worry about the fold version.
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19 # All folded-to characters in non-UTF-8 (Latin1) are members of fold-pairs,
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20 # at least within Latin1, 'k', and 'K', for example. So there aren't
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21 # complications with dealing with unfolded input. That's not true of UTF-8
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22 # patterns, where things can get tricky. Thus for EXACTFL nodes where things
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23 # aren't all folded, code has to be written specially to handle this, instead
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24 # of the macros here being extended to try to handle it.
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25 #
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26 # There are no non-ASCII Latin1 multi-char folds currently, and none likely to
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27 # be ever added. Thus the output is the same as if it were just asking for
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28 # ASCII characters, not full Latin1. Hence, it is suitable for generating
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29 # things that match EXACTFA. It does check for and croak if there ever were
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30 # to be an upper Latin1 range multi-character fold.
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31 #
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32 # This is designed for input to regen/regcharlass.pl.
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33
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34 sub gen_combinations ($;) {
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35 # Generate all combinations for the first parameter which is an array of
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36 # arrays.
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37
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38 my ($fold_ref, $string, $i) = @_;
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39 $string = "" unless $string;
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40 $i = 0 unless $i;
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41
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42 my @ret;
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43
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44 # Look at each element in this level's array.
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45 foreach my $j (0 .. @{$fold_ref->[$i]} - 1) {
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46
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47 # Append its representation to what we have currently
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48 my $new_string = sprintf "$string\\x{%X}", $fold_ref->[$i][$j];
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49
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50 if ($i >= @$fold_ref - 1) { # Final level: just return it
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51 push @ret, "\"$new_string\"";
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52 }
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53 else { # Generate the combinations for the next level with this one's
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54 push @ret, &gen_combinations($fold_ref, $new_string, $i + 1);
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55 }
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56 }
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57
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58 return @ret;
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59 }
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60
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61 sub multi_char_folds ($) {
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62 my $all_folds = shift; # The single parameter is true if wants all
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63 # multi-char folds; false if just the ones that
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64 # are all ascii
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65
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66 my ($cp_ref, $folds_ref, $format) = prop_invmap("Case_Folding");
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67 die "Could not find inversion map for Case_Folding" unless defined $format;
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68 die "Incorrect format '$format' for Case_Folding inversion map"
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69 unless $format eq 'al';
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70 my @folds;
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71
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72 for my $i (0 .. @$folds_ref - 1) {
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73 next unless ref $folds_ref->[$i]; # Skip single-char folds
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74
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75 # The code in regcomp.c currently assumes that no multi-char fold
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76 # folds to the upper Latin1 range. It's not a big deal to add; we
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77 # just have to forbid such a fold in EXACTFL nodes, like we do already
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78 # for ascii chars in EXACTFA (and EXACTFL) nodes. But I (khw) doubt
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79 # that there will ever be such a fold created by Unicode, so the code
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80 # isn't there to occupy space and time; instead there is this check.
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81 die sprintf("regcomp.c can't cope with a latin1 multi-char fold (found in the fold of 0x%X", $cp_ref->[$i]) if grep { $_ < 256 && chr($_) !~ /[[:ascii:]]/ } @{$folds_ref->[$i]};
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82
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83 # Create a line that looks like "\x{foo}\x{bar}\x{baz}" of the code
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84 # points that make up the fold.
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85 my $fold = join "", map { sprintf "\\x{%X}", $_ } @{$folds_ref->[$i]};
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86 $fold = "\"$fold\"";
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87
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88 # Skip if something else already has this fold
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89 next if grep { $_ eq $fold } @folds;
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90
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91 if ($all_folds) {
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92 push @folds, $fold
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93 } # Skip if wants only all-ascii folds, and there is a non-ascii
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94 elsif (! grep { chr($_) =~ /[^[:ascii:]]/ } @{$folds_ref->[$i]}) {
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95
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96 # If the fold is to a cased letter, replace the entry with an
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97 # array which also includes its upper case.
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98 my $this_fold_ref = $folds_ref->[$i];
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99 for my $j (0 .. @$this_fold_ref - 1) {
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100 my $this_ord = $this_fold_ref->[$j];
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101 if (chr($this_ord) =~ /\p{Cased}/) {
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102 my $uc = ord(uc(chr($this_ord)));
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103 undef $this_fold_ref->[$j];
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104 @{$this_fold_ref->[$j]} = ( $this_ord, $uc);
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105 }
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106 }
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107
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108 # Then generate all combinations of upper/lower case of the fold.
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109 push @folds, gen_combinations($this_fold_ref);
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110
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111 }
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112 }
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113
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114 # \x17F is the small LONG S, which folds to 's'. Both Capital and small
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115 # LATIN SHARP S fold to 'ss'. Therefore, they should also match two 17F's
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116 # in a row under regex /i matching. But under /iaa regex matching, all
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117 # three folds to 's' are prohibited, but the sharp S's should still match
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118 # two 17F's. This prohibition causes our regular regex algorithm that
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119 # would ordinarily allow this match to fail. This is the only instance in
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120 # all Unicode of this kind of issue. By adding a special case here, we
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121 # can use the regular algorithm (with some other changes elsewhere as
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122 # well).
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123 #
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124 # It would be possible to re-write the above code to automatically detect
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125 # and handle this case, and any others that might eventually get added to
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126 # the Unicode standard, but I (khw) don't think it's worth it. I believe
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127 # that it's extremely unlikely that more folds to ASCII characters are
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128 # going to be added, and if I'm wrong, fold_grind.t has the intelligence
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129 # to detect them, and test that they work, at which point another special
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130 # case could be added here if necessary.
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131 #
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132 # No combinations of this with 's' need be added, as any of these
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133 # containing 's' are prohibted under /iaa.
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134 push @folds, '"\x{17F}\x{17F}"' if $all_folds;
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135
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136
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137 return @folds;
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138 }
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139
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140 1