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1 | package utf8; |
2 | |
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3 | if (ord('A') != 193) { # make things more pragmatic for EBCDIC folk |
4 | |
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5 | $utf8::hint_bits = 0x00800000; |
6 | |
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7 | sub import { |
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8 | $^H |= $utf8::hint_bits; |
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9 | $enc{caller()} = $_[1] if $_[1]; |
10 | } |
11 | |
12 | sub unimport { |
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13 | $^H &= ~$utf8::hint_bits; |
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14 | } |
15 | |
16 | sub AUTOLOAD { |
17 | require "utf8_heavy.pl"; |
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18 | goto &$AUTOLOAD if defined &$AUTOLOAD; |
19 | Carp::croak("Undefined subroutine $AUTOLOAD called"); |
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20 | } |
21 | |
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22 | } |
23 | |
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24 | 1; |
25 | __END__ |
26 | |
27 | =head1 NAME |
28 | |
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29 | utf8 - Perl pragma to enable/disable UTF-8 in source code |
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30 | |
31 | =head1 SYNOPSIS |
32 | |
33 | use utf8; |
34 | no utf8; |
35 | |
36 | =head1 DESCRIPTION |
37 | |
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38 | WARNING: The implementation of Unicode support in Perl is incomplete. |
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39 | See L<perlunicode> for the exact details. |
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40 | |
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41 | The C<use utf8> pragma tells the Perl parser to allow UTF-8 in the |
42 | program text in the current lexical scope. The C<no utf8> pragma |
43 | tells Perl to switch back to treating the source text as literal |
44 | bytes in the current lexical scope. |
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45 | |
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46 | This pragma is primarily a compatibility device. Perl versions |
47 | earlier than 5.6 allowed arbitrary bytes in source code, whereas |
48 | in future we would like to standardize on the UTF-8 encoding for |
49 | source text. Until UTF-8 becomes the default format for source |
50 | text, this pragma should be used to recognize UTF-8 in the source. |
51 | When UTF-8 becomes the standard source format, this pragma will |
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52 | effectively become a no-op. This pragma already is a no-op on |
53 | EBCDIC platforms (where it is alright to code perl in EBCDIC |
54 | rather than UTF-8). |
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55 | |
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56 | Enabling the C<utf8> pragma has the following effects: |
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57 | |
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58 | =over |
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59 | |
60 | =item * |
61 | |
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62 | Bytes in the source text that have their high-bit set will be treated |
63 | as being part of a literal UTF-8 character. This includes most literals |
64 | such as identifiers, string constants, constant regular expression patterns |
65 | and package names. |
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66 | |
67 | =item * |
68 | |
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69 | In the absence of inputs marked as UTF-8, regular expressions within the |
70 | scope of this pragma will default to using character semantics instead |
71 | of byte semantics. |
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72 | |
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73 | @bytes_or_chars = split //, $data; # may split to bytes if data |
74 | # $data isn't UTF-8 |
75 | { |
76 | use utf8; # force char semantics |
77 | @chars = split //, $data; # splits characters |
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78 | } |
79 | |
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80 | =head1 SEE ALSO |
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81 | |
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82 | L<perlunicode>, L<bytes> |
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83 | |
84 | =cut |