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1 | #!/usr/local/bin/perl |
2 | # | |
3 | # euc_jp.pm : EUC Japanese Character Support Functions | |
4 | # This modules is experimental. API may be changed. | |
5 | # | |
6 | # $Id: euc_jp.pm,v 1.2 2001-04-22 22:35:41+09 hayashi Exp $ | |
7 | # | |
8 | # Copyright (c) 2001 Hiroo Hayashi. All rights reserved. | |
9 | # | |
10 | # This program is free software; you can redistribute it and/or | |
11 | # modify it under the same terms as Perl itself. | |
12 | # | |
13 | ||
14 | package Term::ReadLine::Gnu::XS; | |
15 | ||
16 | use Carp; | |
17 | use strict; | |
18 | ||
19 | # make aliases | |
20 | use vars qw(%Attribs); | |
21 | *Attribs = \%Term::ReadLine::Gnu::Attribs; | |
22 | ||
23 | # enable Meta | |
24 | rl_prep_terminal(1); | |
25 | ||
26 | rl_add_defun('euc-jp-forward', \&ej_forward); | |
27 | rl_add_defun('euc-jp-backward', \&ej_backward); | |
28 | rl_add_defun('euc-jp-backward-delete-char', \&ej_rubout); | |
29 | rl_add_defun('euc-jp-delete-char', \&ej_delete); | |
30 | rl_add_defun('euc-jp-forward-backward-delete-char', \&ej_rubout_or_delete); | |
31 | rl_add_defun('euc-jp-transpose-chars', \&ej_transpose_chars); | |
32 | ||
33 | rl_bind_key(ord "\cf", 'euc-jp-forward'); | |
34 | rl_bind_key(ord "\cb", 'euc-jp-backward'); | |
35 | rl_bind_key(ord "\ch", 'euc-jp-backward-delete-char'); | |
36 | #rl_bind_key(ord "\cd", 'euc-jp-delete-char'); | |
37 | rl_bind_key(ord "\cd", 'euc-jp-forward-backward-delete-char'); | |
38 | rl_bind_key(ord "\ct", 'euc-jp-transpose-chars'); | |
39 | ||
40 | 1; | |
41 | ||
42 | # An EUC Japanese character consists of two 8 bit characters. | |
43 | # And the MSBs (most significant bit) of both bytes are set. | |
44 | ||
45 | # To support Shift-JIS charactor set the following two functions | |
46 | # must be extended. | |
47 | sub ej_first_byte_p { | |
48 | my ($p) = @_; | |
49 | my $l = $Attribs{line_buffer}; | |
50 | return substr($l, $p, 1) =~ /[\x80-\xff]/ | |
51 | && substr($l, 0, $p) =~ /^([\x00-x7f]|([\x80-\xff][\x80-\xff]))*$/; | |
52 | } | |
53 | ||
54 | sub ej_second_byte_p { | |
55 | my ($p) = @_; | |
56 | my $l = $Attribs{line_buffer}; | |
57 | return $p > 0 && substr($l, $p, 1) =~ /[\x80-\xff]/ | |
58 | && substr($l, 0, $p) !~ /^([\x00-x7f]|([\x80-\xff][\x80-\xff]))*$/; | |
59 | } | |
60 | ||
61 | #forward-char | |
62 | sub ej_forward { | |
63 | my($count, $key) = @_; | |
64 | if ($count < 0) { | |
65 | ej_backward(-$count, $key); | |
66 | } else { | |
67 | while ($count--) { | |
68 | if (ej_first_byte_p($Attribs{point})) { | |
69 | rl_call_function('forward-char', 2, $key); | |
70 | } else { | |
71 | rl_call_function('forward-char', 1, $key); | |
72 | } | |
73 | } | |
74 | } | |
75 | return 0; | |
76 | } | |
77 | ||
78 | #backward-char | |
79 | sub ej_backward { | |
80 | my($count, $key) = @_; | |
81 | if ($count < 0) { | |
82 | ej_forward(-$count, $key); | |
83 | } else { | |
84 | while ($count--) { | |
85 | if (ej_second_byte_p($Attribs{point})) { | |
86 | rl_call_function('backward-char', 1, $key); | |
87 | } | |
88 | if (ej_second_byte_p($Attribs{point} - 1)) { | |
89 | rl_call_function('backward-char', 2, $key); | |
90 | } else { | |
91 | rl_call_function('backward-char', 1, $key); | |
92 | } | |
93 | } | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
98 | #backward-delete-char | |
99 | sub ej_rubout { | |
100 | my($count, $key) = @_; | |
101 | if ($count < 0) { | |
102 | ej_delete(-$count, $key); | |
103 | } else { | |
104 | if ($Attribs{point} <= 0) { | |
105 | rl_ding(); | |
106 | return 1; | |
107 | } | |
108 | while ($count--) { | |
109 | if (ej_second_byte_p($Attribs{point})) { | |
110 | $Attribs{point}--; | |
111 | } | |
112 | if (ej_second_byte_p($Attribs{point} - 1)) { | |
113 | rl_call_function('backward-delete-char', 2, $key); | |
114 | } else { | |
115 | rl_call_function('backward-delete-char', 1, $key); | |
116 | } | |
117 | } | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
122 | #delete-char | |
123 | sub ej_delete { | |
124 | my($count, $key) = @_; | |
125 | if ($count < 0) { | |
126 | ej_rubout(-$count, $key); | |
127 | } else { | |
128 | while ($count--) { | |
129 | if (ej_first_byte_p($Attribs{point})) { | |
130 | rl_call_function('delete-char', 2, $key); | |
131 | } elsif (ej_second_byte_p($Attribs{point})) { | |
132 | rl_call_function('backward-delete-char', 1, $key); | |
133 | rl_call_function('delete-char', 1, $key); | |
134 | } else { | |
135 | rl_call_function('delete-char', 1, $key); | |
136 | } | |
137 | } | |
138 | } | |
139 | return 0; | |
140 | } | |
141 | ||
142 | #forward-backward-delete-char | |
143 | sub ej_rubout_or_delete { | |
144 | my($count, $key) = @_; | |
145 | if ($Attribs{end} != 0 && $Attribs{point} == $Attribs{end}) { | |
146 | return ej_rubout($count, $key); | |
147 | } else { | |
148 | return ej_delete($count, $key); | |
149 | } | |
150 | } | |
151 | ||
152 | #transpose-chars | |
153 | sub ej_transpose_chars { | |
154 | my($count, $key) = @_; | |
155 | ||
156 | return 0 unless $count; | |
157 | ||
158 | if (ej_second_byte_p($Attribs{point})) { | |
159 | $Attribs{point}--; | |
160 | } | |
161 | if ($Attribs{point} == 0 # the beginning of the line | |
162 | || ($Attribs{end} < 2) # only one ascii char | |
163 | # only one EUC char | |
164 | || ($Attribs{end} == 2 && ej_first_byte_p(0))) { | |
165 | rl_ding(); | |
166 | return -1; | |
167 | } | |
168 | rl_begin_undo_group(); | |
169 | if ($Attribs{point} == $Attribs{end}) { | |
170 | # If point is at the end of the line | |
171 | ej_backward(1, $key); | |
172 | $count = 1; | |
173 | } | |
174 | ej_backward(1, $key); | |
175 | my $dummy; | |
176 | if (ej_first_byte_p($Attribs{point})) { | |
177 | $dummy = substr($Attribs{line_buffer}, $Attribs{point}, 2); | |
178 | rl_delete_text($Attribs{point}, $Attribs{point} + 2); | |
179 | } else { | |
180 | $dummy = substr($Attribs{line_buffer}, $Attribs{point}, 1); | |
181 | rl_delete_text($Attribs{point}, $Attribs{point} + 1); | |
182 | } | |
183 | ej_forward($count, $key); | |
184 | rl_insert_text($dummy); | |
185 | rl_end_undo_group(); | |
186 | return 0; | |
187 | } |