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.IX Title "Image::ExifTool::BuildTagLookup 3"
.TH Image::ExifTool::BuildTagLookup 3 2024-04-05 "perl v5.38.2" "User Contributed Perl Documentation"
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.SH NAME
Image::ExifTool::BuildTagLookup \- Build ExifTool tag lookup tables
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This module is used to generate the tag lookup tables in
Image::ExifTool::TagLookup.pm and tag name documentation in
Image::ExifTool::TagNames.pod, as well as HTML tag name documentation.  It
is used before each new ExifTool release to update the lookup tables and
documentation, but it is not used otherwise.  It also performs some
validation and consistency checks on the tag tables.
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&  use Image::ExifTool::BuildTagLookup;
\&
\&  $builder = Image::ExifTool::BuildTagLookup\->new;
\&
\&  # update Image::ExifTool::TagLookup
\&  $ok = $builder\->WriteTagLookup(\*(Aqlib/Image/ExifTool/TagLookup.pm\*(Aq);
\&
\&  # update the tag name documentation
\&  $ok = $builder\->WriteTagNames(\*(Aqlib/Image/ExifTool/TagNames.pod\*(Aq,\*(Aqhtml\*(Aq);
\&
\&  # print some statistics
\&  my $count = $$builder{COUNT};
\&  foreach (sort keys %$count) {
\&      printf "%5d %s\en", $$count{$_}, $_;
\&  }
.Ve
.SH "MEMBER VARIABLES"
.IX Header "MEMBER VARIABLES"
.IP PRESERVE_DATE 4
.IX Item "PRESERVE_DATE"
Flag to preserve "Last revised" date in HTML files.  Set before calling
\&\fBWriteTagNames()\fR.
.IP COUNT 4
.IX Item "COUNT"
Reference to hash containing counting statistics.  Keys are the
descriptions, and values are the numerical counts.  Valid after
BuildTagLookup object is created, but additional statistics are added by
\&\fBWriteTagNames()\fR.
.IP WRITE_PSEUDO 4
.IX Item "WRITE_PSEUDO"
Returned list of writable pseudo tags.
.SH AUTHOR
.IX Header "AUTHOR"
Copyright 2003\-2024, Phil Harvey (philharvey66 at gmail.com)
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBImage::ExifTool\fR\|(3pm),
\&\fBImage::ExifTool::TagLookup\fR\|(3pm),
\&\fBImage::ExifTool::TagNames\fR\|(3pm)