diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /systems/texlive/tlnet/tlpkg/tlperl/lib/meta_notation.pm |
Initial commit
Diffstat (limited to 'systems/texlive/tlnet/tlpkg/tlperl/lib/meta_notation.pm')
-rw-r--r-- | systems/texlive/tlnet/tlpkg/tlperl/lib/meta_notation.pm | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/systems/texlive/tlnet/tlpkg/tlperl/lib/meta_notation.pm b/systems/texlive/tlnet/tlpkg/tlperl/lib/meta_notation.pm new file mode 100644 index 0000000000..eea85875c9 --- /dev/null +++ b/systems/texlive/tlnet/tlpkg/tlperl/lib/meta_notation.pm @@ -0,0 +1,53 @@ +use strict; +use warnings; + +# A tiny private library routine which is a helper to several Perl core +# modules, to allow a paradigm to be implemented in a single place. The name, +# contents, or even the existence of this file may be changed at any time and +# are NOT to be used by anything outside the Perl core. + +sub _meta_notation ($) { + + # Returns a copy of the input string with the nonprintable characters + # below 0x100 changed into printables. Any ASCII printables or above 0xFF + # are unchanged. (XXX Probably above-Latin1 characters should be + # converted to \X{...}) + # + # \0 .. \x1F (which are "\c@" .. "\c_") are changed into ^@, ^A, ^B, ... + # ^Z, ^[, ^\, ^], ^^, ^_ + # \c? is changed into ^?. + # + # The above accounts for all the ASCII-range nonprintables. + # + # On ASCII platforms, the upper-Latin1-range characters are converted to + # Meta notation, so that \xC1 becomes 'M-A', \xE2 becomes 'M-b', etc. + # This is how it always has worked, so is continued that way for backwards + # compatibility. The range \x80 .. \x9F becomes M-^@ .. M-^A, M-^B, ... + # M-^Z, M-^[, M-^\, M-^], M-^, M-^_ + # + # On EBCDIC platforms, the upper-Latin1-range characters are converted + # into '\x{...}' Meta notation doesn't make sense on EBCDIC platforms + # because the ASCII-range printables are a mixture of upper bit set or + # not. [A-Za-Z0-9] all have the upper bit set. The underscore likely + # doesn't; and other punctuation may or may not. There's no simple + # pattern. + + my $string = shift; + + $string =~ s/([\0-\037])/ + sprintf("^%c",utf8::unicode_to_native(ord($1)^64))/xeg; + $string =~ s/\c?/^?/g; + if (ord("A") == 65) { + $string =~ s/([\200-\237])/sprintf("M-^%c",(ord($1)&0177)^64)/eg; + $string =~ s/([\240-\377])/sprintf("M-%c" ,ord($1)&0177)/eg; + } + else { + no warnings 'experimental::regex_sets'; + # Leave alone things above \xff + $string =~ s/( (?[ [\x00-\xFF] & [:^print:]])) / + sprintf("\\x{%X}", ord($1))/xaeg; + } + + return $string; +} +1 |