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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" Pandoc::Filter::HeaderIdentifiers \- Add identifiers to headers .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& my $id = header_identifier( $header\->content ); # calculate identifier \& \& Pandoc::Filter::HeaderIdentifiers\->new\->apply($doc); # add all identifiers .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" This Pandoc::Filter adds identifier attributes (id) to all Headers elements. It uses the same algorithm as internally used by pandoc. The module also exports function \&\f(CW\*(C`header_identifier\*(C'\fR to calculate an identifier from a list of elements. .SH "FUNCTIONS" .IX Header "FUNCTIONS" .ie n .SS "header_identifier( $content [, $ids ] )" .el .SS "header_identifier( \f(CW$content\fP [, \f(CW$ids\fP ] )" .IX Subsection "header_identifier( $content [, $ids ] )" Returns an identifier for a given list of inlines or string (\f(CW$content\fR). Optionally takes into account and updates existing ids, given as hash reference mapping identifier to usage count (\f(CW$ids\fR). .SH "METHODS" .IX Header "METHODS" .ie n .SS "apply( $element [, $ids ] )" .el .SS "apply( \f(CW$element\fP [, \f(CW$ids\fP ] )" .IX Subsection "apply( $element [, $ids ] )" Add identifiers to all Header elements found at a given element (typically a Document. A hash reference of existing identifier counts (or an empty hash to get the new counts) can be passed in addition. .SH "CHARACTER PROPERTIES" .IX Header "CHARACTER PROPERTIES" .SS "InPandocHeaderIdentifier" .IX Subsection "InPandocHeaderIdentifier" Matches all Unicode lowercase letters, digits 0 to 9, underscore, hyphen, and period. In the unlikely event that you want to check whether a given string could have been generated as header identifier, use this: .PP .Vb 1 \& $id =~ /^\ep{InPandocHeaderIdentifier}+$/ and $id =~ /^\ep{Letter}/ .Ve .SH "SEE ALSO" .IX Header "SEE ALSO"