summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlperl/lib/Locale/Maketext/Guts.pm
blob: 9af292c61cca7cf4c0e70a1a6c22d8f548262b57 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
package Locale::Maketext::Guts;

$VERSION = '1.13';

BEGIN {
    # Just so we're nice and define SOMETHING in "our" package.
    *zorp = sub { return scalar @_ } unless defined &zorp;
}

package Locale::Maketext;
use strict;
use vars qw($USE_LITERALS $GUTSPATH);

BEGIN {
    $GUTSPATH = __FILE__;
    *DEBUG = sub () {0} unless defined &DEBUG;
}

use utf8;

sub _compile {
    # This big scary routine compiles an entry.
    # It returns either a coderef if there's brackety bits in this, or
    #  otherwise a ref to a scalar.

    my $target = ref($_[0]) || $_[0];

    my(@code);
    my(@c) = (''); # "chunks" -- scratch.
    my $call_count = 0;
    my $big_pile = '';
    {
        my $in_group = 0; # start out outside a group
        my($m, @params); # scratch

        while($_[1] =~  # Iterate over chunks.
            m/\G(
                [^\~\[\]]+  # non-~[] stuff
                |
                ~.       # ~[, ~], ~~, ~other
                |
                \[          # [ presumably opening a group
                |
                \]          # ] presumably closing a group
                |
                ~           # terminal ~ ?
                |
                $
            )/xgs
        ) {
            DEBUG>2 and print qq{  "$1"\n};

            if($1 eq '[' or $1 eq '') {       # "[" or end
                # Whether this is "[" or end, force processing of any
                #  preceding literal.
                if($in_group) {
                    if($1 eq '') {
                        $target->_die_pointing($_[1], 'Unterminated bracket group');
                    }
                    else {
                        $target->_die_pointing($_[1], 'You can\'t nest bracket groups');
                    }
                }
                else {
                    if ($1 eq '') {
                        DEBUG>2 and print "   [end-string]\n";
                    }
                    else {
                        $in_group = 1;
                    }
                    die "How come \@c is empty?? in <$_[1]>" unless @c; # sanity
                    if(length $c[-1]) {
                        # Now actually processing the preceding literal
                        $big_pile .= $c[-1];
                        if($USE_LITERALS and (
                                (ord('A') == 65)
                                ? $c[-1] !~ m/[^\x20-\x7E]/s
                                # ASCII very safe chars
                                : $c[-1] !~ m/[^ !"\#\$%&'()*+,\-.\/0-9:;<=>?\@A-Z[\\\]^_`a-z{|}~\x07]/s
                                # EBCDIC very safe chars
                            )) {
                            # normal case -- all very safe chars
                            $c[-1] =~ s/'/\\'/g;
                            push @code, q{ '} . $c[-1] . "',\n";
                            $c[-1] = ''; # reuse this slot
                        }
                        else {
                            push @code, ' $c[' . $#c . "],\n";
                            push @c, ''; # new chunk
                        }
                    }
                    # else just ignore the empty string.
                }

            }
            elsif($1 eq ']') {  # "]"
                # close group -- go back in-band
                if($in_group) {
                    $in_group = 0;

                    DEBUG>2 and print "   --Closing group [$c[-1]]\n";

                    # And now process the group...

                    if(!length($c[-1]) or $c[-1] =~ m/^\s+$/s) {
                        DEBUG > 2 and print "   -- (Ignoring)\n";
                        $c[-1] = ''; # reset out chink
                        next;
                    }

                    #$c[-1] =~ s/^\s+//s;
                    #$c[-1] =~ s/\s+$//s;
                    ($m,@params) = split(/,/, $c[-1], -1);  # was /\s*,\s*/

                    # A bit of a hack -- we've turned "~,"'s into DELs, so turn
                    #  'em into real commas here.
                    if (ord('A') == 65) { # ASCII, etc
                        foreach($m, @params) { tr/\x7F/,/ }
                    }
                    else {              # EBCDIC (1047, 0037, POSIX-BC)
                        # Thanks to Peter Prymmer for the EBCDIC handling
                        foreach($m, @params) { tr/\x07/,/ }
                    }

                    # Special-case handling of some method names:
                    if($m eq '_*' or $m =~ m/^_(-?\d+)$/s) {
                        # Treat [_1,...] as [,_1,...], etc.
                        unshift @params, $m;
                        $m = '';
                    }
                    elsif($m eq '*') {
                        $m = 'quant'; # "*" for "times": "4 cars" is 4 times "cars"
                    }
                    elsif($m eq '#') {
                        $m = 'numf';  # "#" for "number": [#,_1] for "the number _1"
                    }

                    # Most common case: a simple, legal-looking method name
                    if($m eq '') {
                        # 0-length method name means to just interpolate:
                        push @code, ' (';
                    }
                    elsif($m =~ /^\w+(?:\:\:\w+)*$/s
                            and $m !~ m/(?:^|\:)\d/s
                        # exclude starting a (sub)package or symbol with a digit
                    ) {
                        # Yes, it even supports the demented (and undocumented?)
                        #  $obj->Foo::bar(...) syntax.
                        $target->_die_pointing(
                            $_[1], q{Can't use "SUPER::" in a bracket-group method},
                            2 + length($c[-1])
                        )
                        if $m =~ m/^SUPER::/s;
                        # Because for SUPER:: to work, we'd have to compile this into
                        #  the right package, and that seems just not worth the bother,
                        #  unless someone convinces me otherwise.

                        push @code, ' $_[0]->' . $m . '(';
                    }
                    else {
                        # TODO: implement something?  or just too icky to consider?
                        $target->_die_pointing(
                            $_[1],
                            "Can't use \"$m\" as a method name in bracket group",
                            2 + length($c[-1])
                        );
                    }

                    pop @c; # we don't need that chunk anymore
                    ++$call_count;

                    foreach my $p (@params) {
                        if($p eq '_*') {
                            # Meaning: all parameters except $_[0]
                            $code[-1] .= ' @_[1 .. $#_], ';
                            # and yes, that does the right thing for all @_ < 3
                        }
                        elsif($p =~ m/^_(-?\d+)$/s) {
                            # _3 meaning $_[3]
                            $code[-1] .= '$_[' . (0 + $1) . '], ';
                        }
                        elsif($USE_LITERALS and (
                                (ord('A') == 65)
                                ? $p !~ m/[^\x20-\x7E]/s
                                # ASCII very safe chars
                                : $p !~ m/[^ !"\#\$%&'()*+,\-.\/0-9:;<=>?\@A-Z[\\\]^_`a-z{|}~\x07]/s
                                # EBCDIC very safe chars
                            )) {
                            # Normal case: a literal containing only safe characters
                            $p =~ s/'/\\'/g;
                            $code[-1] .= q{'} . $p . q{', };
                        }
                        else {
                            # Stow it on the chunk-stack, and just refer to that.
                            push @c, $p;
                            push @code, ' $c[' . $#c . '], ';
                        }
                    }
                    $code[-1] .= "),\n";

                    push @c, '';
                }
                else {
                    $target->_die_pointing($_[1], q{Unbalanced ']'});
                }

            }
            elsif(substr($1,0,1) ne '~') {
                # it's stuff not containing "~" or "[" or "]"
                # i.e., a literal blob
                $c[-1] .= $1;

            }
            elsif($1 eq '~~') { # "~~"
                $c[-1] .= '~';

            }
            elsif($1 eq '~[') { # "~["
                $c[-1] .= '[';

            }
            elsif($1 eq '~]') { # "~]"
                $c[-1] .= ']';

            }
            elsif($1 eq '~,') { # "~,"
                if($in_group) {
                    # This is a hack, based on the assumption that no-one will actually
                    # want a DEL inside a bracket group.  Let's hope that's it's true.
                    if (ord('A') == 65) { # ASCII etc
                        $c[-1] .= "\x7F";
                    }
                    else {              # EBCDIC (cp 1047, 0037, POSIX-BC)
                        $c[-1] .= "\x07";
                    }
                }
                else {
                    $c[-1] .= '~,';
                }

            }
            elsif($1 eq '~') { # possible only at string-end, it seems.
                $c[-1] .= '~';

            }
            else {
                # It's a "~X" where X is not a special character.
                # Consider it a literal ~ and X.
                $c[-1] .= $1;
            }
        }
    }

    if($call_count) {
        undef $big_pile; # Well, nevermind that.
    }
    else {
        # It's all literals!  Ahwell, that can happen.
        # So don't bother with the eval.  Return a SCALAR reference.
        return \$big_pile;
    }

    die q{Last chunk isn't null??} if @c and length $c[-1]; # sanity
    DEBUG and warn scalar(@c), " chunks under closure\n";
    if(@code == 0) { # not possible?
        DEBUG and warn "Empty code\n";
        return \'';
    }
    elsif(@code > 1) { # most cases, presumably!
        unshift @code, "join '',\n";
    }
    unshift @code, "use strict; sub {\n";
    push @code, "}\n";

    DEBUG and warn @code;
    my $sub = eval(join '', @code);
    die "$@ while evalling" . join('', @code) if $@; # Should be impossible.
    return $sub;
}

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

sub _die_pointing {
    # This is used by _compile to throw a fatal error
    my $target = shift; # class name
    # ...leaving $_[0] the error-causing text, and $_[1] the error message

    my $i = index($_[0], "\n");

    my $pointy;
    my $pos = pos($_[0]) - (defined($_[2]) ? $_[2] : 0) - 1;
    if($pos < 1) {
        $pointy = "^=== near there\n";
    }
    else { # we need to space over
        my $first_tab = index($_[0], "\t");
        if($pos > 2 and ( -1 == $first_tab  or  $first_tab > pos($_[0]))) {
            # No tabs, or the first tab is harmlessly after where we will point to,
            # AND we're far enough from the margin that we can draw a proper arrow.
            $pointy = ('=' x $pos) . "^ near there\n";
        }
        else {
            # tabs screw everything up!
            $pointy = substr($_[0],0,$pos);
            $pointy =~ tr/\t //cd;
            # make everything into whitespace, but preseving tabs
            $pointy .= "^=== near there\n";
        }
    }

    my $errmsg = "$_[1], in\:\n$_[0]";

    if($i == -1) {
        # No newline.
        $errmsg .= "\n" . $pointy;
    }
    elsif($i == (length($_[0]) - 1)  ) {
        # Already has a newline at end.
        $errmsg .= $pointy;
    }
    else {
        # don't bother with the pointy bit, I guess.
    }
    Carp::croak( "$errmsg via $target, as used" );
}

1;