📄 ch13.033_best
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################################################################################ Code fragment (Recommended) from Chapter 13 of "Perl Best Practices" #### Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved. #### See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html ################################################################################# Standard modules...use strict;use warnings;use IO::Prompt;use Carp;use English qw( -no_match_vars );use Data::Alias;use Readonly;Readonly my $REPORT_CONTEXT_LEN => 10;my $source = '<BLINK</body>';my $filename = $PROGRAM_NAME;my @tag_stack = ('<body>', '<em>' );if (0) {}# Otherwise parsing has failed...else { # So grab up to $REPORT_CONTEXT_LEN characters on the same line, # from the point in the data where things went wrong... my ($context) = $source =~ m/ \G [^\n]{0,$REPORT_CONTEXT_LEN} /gcxms; # And throw an exception explaining what/why/where/whence... croak( qq{File '$filename' is not valid DAXML.\n}, qq{Missing "$tag_stack[-1]" tag.\n}, qq{Problem detected near "$context".\n}, qq{Failed}, );}⌨️ 快捷键说明
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