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
|
# Copyright 2022 Jeffrey Kegler
# This file is part of Marpa::R2. Marpa::R2 is free software: you can
# redistribute it and/or modify it under the terms of the GNU Lesser
# General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# Marpa::R2 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser
# General Public License along with Marpa::R2. If not, see
# http://www.gnu.org/licenses/.
package Marpa::R2::Display;
use 5.010001;
use strict;
use warnings;
use Fatal qw(open close);
use YAML::XS;
use Data::Dumper; # for debugging
use Carp;
package Marpa::R2::Display::Internal;
use English qw( -no_match_vars );
sub Marpa::R2::Display::new {
my ($class) = @_;
my $self = {};
$self->{displays} = {};
$self->{ignored_displays} = [];
return bless $self, $class;
} ## end sub Marpa::R2::Display::new
@Marpa::R2::Display::Internal::DISPLAY_SPECS = qw(
start-after-line end-before-line perltidy normalize-whitespace name
remove-display-indent
remove-blank-last-line
partial flatten inline
ignore
);
sub Marpa::R2::Display::read {
my ( $self, $data_arg, $file_name ) = @_;
my @lines;
GET_LINES: {
if ( not ref $data_arg ) {
$file_name //= $data_arg;
open my $fh, q{<}, $data_arg;
@lines = <$fh>;
close $fh;
last GET_LINES;
} ## end if ( not ref $data_arg )
$file_name //= q{?};
@lines = split /\n/xms, ${$data_arg};
} ## end GET_LINES:
chomp @lines;
my @verbatim_lines;
my $in_pod = 0;
my $in_verbatim = 0;
my $in_begin;
POD_LINE: for my $zero_based_line ( 0 .. $#lines ) {
my $line = $lines[$zero_based_line];
if ( $in_pod and $line =~ /\A=cut/xms ) {
$in_pod = 0;
$in_verbatim = 0;
$in_begin = undef;
next POD_LINE;
} ## end if ( $in_pod and $line =~ /\A=cut/xms )
if ( not $in_pod and $line =~ /\A=[a-zA-Z]/xms ) {
$in_pod = 1;
}
next POD_LINE if not $in_pod;
# at this point out $in_pod indicates if we are
# in a pod sequence
if ( $in_pod and not $in_begin and $line =~ /\A=begin\s+(.*)/xms ) {
my $begin_identifier = $1;
if ( $begin_identifier !~ /\A:/xms ) {
$in_begin = $begin_identifier;
}
} ## end if ( $in_pod and not $in_begin and $line =~ ...)
if ( $in_begin and $line =~ /\A=end\s+(.*)/xms ) {
my $begin_identifier = $1;
if ( $begin_identifier eq $in_begin ) {
$in_begin = undef;
}
} ## end if ( $in_begin and $line =~ /\A=end\s+(.*)/xms )
# Don't look for verbatim paragraph inside begin
next POD_LINE if $in_begin;
# Is this the start of a verbatim paragraph?
if ( not $in_verbatim and $line =~ /\A[ \t]/xms ) {
$in_verbatim = 1;
}
if ( $in_verbatim and $line =~ /\A[ \t]*\z/xms ) {
$in_verbatim = 0;
}
if ($in_verbatim) {
$verbatim_lines[ $zero_based_line + 1 ] = $line;
}
} ## end for my $zero_based_line ( 0 .. $#lines )
LINE: for my $zero_based_line ( 0 .. $#lines ) {
my $line = $lines[$zero_based_line];
my $display_spec;
my $display_spec_line_number = $zero_based_line + 1;
if ( $line =~ /^[#] \s+ Marpa::R2[:][:]Display/xms ) {
my $yaml = q{};
while ( ( my $yaml_line = $lines[ ++$zero_based_line ] )
=~ /^[#]/xms )
{
$yaml .= "$yaml_line\n";
}
if ( $yaml =~ / \S /xms ) {
$yaml =~ s/^ [#] \s? //xmsg;
local $main::EVAL_ERROR = undef;
my $eval_ok =
eval { $display_spec = YAML::XS::Load($yaml); 1 };
if ( not $eval_ok ) {
say {*STDERR} $main::EVAL_ERROR
or Carp::croak("Cannot print: $ERRNO");
say {*STDERR}
"Fatal error in YAML Display spec at $file_name, line "
. ( $display_spec_line_number + 1 )
or Carp::croak("Cannot print: $ERRNO");
} ## end if ( not $eval_ok )
} ## end if ( $yaml =~ / \S /xms )
} ## end if ( $line =~ /^[#] \s+ Marpa::R2[:][:]Display/xms )
if ( $line =~ /^[=]for \s+ Marpa::R2[:][:]Display/xms ) {
my $yaml = q{};
while (
( my $yaml_line = $lines[ ++$zero_based_line ] ) =~ /\S/xms )
{
$yaml .= "$yaml_line\n";
}
if ( $yaml =~ / \S /xms ) {
local $main::EVAL_ERROR = undef;
my $eval_ok =
eval { $display_spec = YAML::XS::Load($yaml); 1 };
if ( not $eval_ok ) {
say {*STDERR} $main::EVAL_ERROR
or Carp::croak("Cannot print: $ERRNO");
say {*STDERR}
"Fatal error in YAML Display spec at $file_name, line "
. ( $display_spec_line_number + 1 )
or Carp::croak("Cannot print: $ERRNO");
} ## end if ( not $eval_ok )
} ## end if ( $yaml =~ / \S /xms )
} ## end if ( $line =~ /^[=]for \s+ Marpa::R2[:][:]Display/xms)
next LINE if not defined $display_spec;
SPEC: for my $spec ( keys %{$display_spec} ) {
next SPEC
if $spec ~~ \@Marpa::R2::Display::Internal::DISPLAY_SPECS;
say {*STDERR}
qq{Warning: Unknown display spec "$spec" in $file_name, line $display_spec_line_number}
or Carp::croak("Cannot print: $ERRNO");
} ## end for my $spec ( keys %{$display_spec} )
my $content;
my $content_start_line;
my $content_end_line;
if ( defined( my $end_pattern = $display_spec->{'end-before-line'} ) )
{
my $end_pat = qr/$end_pattern/xms;
if (defined(
my $start_pattern = $display_spec->{'start-after-line'}
)
)
{
my $start_pat = qr/$start_pattern/xms;
PRE_CONTENT_LINE: while (1) {
my $pre_content_line = $lines[ ++$zero_based_line ];
if ( not defined $pre_content_line ) {
say {*STDERR}
qq{Warning: Pattern "$start_pattern" never found, },
qq{started looking at $file_name, line $display_spec_line_number}
or Carp::croak("Cannot print: $ERRNO");
return $self;
} ## end if ( not defined $pre_content_line )
last PRE_CONTENT_LINE
if $pre_content_line =~ /$start_pat/xms;
} ## end while (1)
} ## end if ( defined( my $start_pattern = $display_spec->{...}))
CONTENT_LINE: while (1) {
my $content_line = $lines[ ++$zero_based_line ];
if ( not defined $content_line ) {
say {*STDERR}
qq{Warning: Pattern "$end_pattern" never found, },
qq{started looking at $file_name, line $display_spec_line_number}
or Carp::croak("Cannot print: $ERRNO");
} ## end if ( not defined $content_line )
last CONTENT_LINE if $content_line =~ /$end_pat/xms;
$content .= "$content_line\n";
$content_end_line = $zero_based_line + 1;
$content_start_line //= $zero_based_line + 1;
} ## end while (1)
} ## end if ( defined( my $end_pattern = $display_spec->{...}))
if ( not defined $content ) {
CONTENT_LINE: while (1) {
my $content_line = $lines[ ++$zero_based_line ];
if ( not defined $content_line ) {
say {*STDERR}
q{Warning: Pattern "Marpa::R2::Display::End" never found,}
. qq{started looking at $file_name, line $display_spec_line_number}
or Carp::croak("Cannot print: $ERRNO");
return $self;
} ## end if ( not defined $content_line )
last CONTENT_LINE
if $content_line
=~ /^[=]for \s+ Marpa::R2[:][:]Display[:][:]End\b/xms;
last CONTENT_LINE
if $content_line
=~ /^[#] \s* Marpa::R2[:][:]Display[:][:]End\b/xms;
$content .= "$content_line\n";
$content_end_line = $zero_based_line + 1;
$content_start_line //= $zero_based_line + 1;
} ## end while (1)
} ## end if ( not defined $content )
$content //= '!?! No Content Found !?!';
my $display_spec_name = $display_spec->{name};
my $ignore = $display_spec->{ignore};
if ( not $display_spec_name and not $ignore ) {
say {*STDERR} q{Warning: Unnamed display }
. qq{at $file_name, line $display_spec_line_number}
or Carp::croak("Cannot print: $ERRNO");
next LINE;
} ## end if ( not $display_spec_name and not $ignore )
$display_spec->{filename} = $file_name;
$display_spec->{display_spec_line} = $display_spec_line_number;
$display_spec->{content} = $content;
$display_spec->{content_start_line} = $content_start_line;
$display_spec->{content_end_line} = $content_end_line;
$display_spec->{line} = $content_start_line
// $display_spec_line_number;
$verbatim_lines[$_] = undef
for $display_spec->{line} .. $display_spec->{content_end_line};
if ( not $ignore ) {
push @{ $self->{displays}->{$display_spec_name} }, $display_spec;
next LINE;
}
push @{ $self->{ignored_displays} }, $display_spec;
} ## end for my $zero_based_line ( 0 .. $#lines )
$self->{verbatim_lines}->{$file_name} = \@verbatim_lines;
return $self;
} ## end sub Marpa::R2::Display::read
1;
|
