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.\" ========================================================================
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.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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.\" ========================================================================
.\"
.IX Title "Template::Parser 3"
.TH Template::Parser 3 "2024-06-21" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Template::Parser \- LALR(1) parser for compiling template documents
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use Template::Parser;
\&
\& $parser = Template::Parser\->new(\e%config);
\& $template = $parser\->parse($text)
\& || die $parser\->error(), "\en";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`Template::Parser\*(C'\fR module implements a \s-1\fBLALR\s0\fR\|(1) parser and associated
methods for parsing template documents into Perl code.
.SH "PUBLIC METHODS"
.IX Header "PUBLIC METHODS"
.SS "new(\e%params)"
.IX Subsection "new(%params)"
The \f(CW\*(C`new()\*(C'\fR constructor creates and returns a reference to a new
\&\f(CW\*(C`Template::Parser\*(C'\fR object.
.PP
A reference to a hash may be supplied as a parameter to provide configuration values.
See \*(L"\s-1CONFIGURATION OPTIONS\*(R"\s0 below for a summary of these options and
Template::Manual::Config for full details.
.PP
.Vb 4
\& my $parser = Template::Parser\->new({
\& START_TAG => quotemeta(\*(Aq<+\*(Aq),
\& END_TAG => quotemeta(\*(Aq+>\*(Aq),
\& });
.Ve
.SS "parse($text)"
.IX Subsection "parse($text)"
The \f(CW\*(C`parse()\*(C'\fR method parses the text passed in the first parameter and
returns a reference to a hash array of data defining the compiled
representation of the template text, suitable for passing to the
Template::Document \fBnew()\fR constructor method. On
error, undef is returned.
.PP
.Vb 2
\& $data = $parser\->parse($text)
\& || die $parser\->error();
.Ve
.PP
The \f(CW$data\fR hash reference returned contains a \f(CW\*(C`BLOCK\*(C'\fR item containing the
compiled Perl code for the template, a \f(CW\*(C`DEFBLOCKS\*(C'\fR item containing a
reference to a hash array of sub-template \f(CW\*(C`BLOCK\*(C'\fRs defined within in the
template, and a \f(CW\*(C`METADATA\*(C'\fR item containing a reference to a hash array
of metadata values defined in \f(CW\*(C`META\*(C'\fR tags.
.SH "CONFIGURATION OPTIONS"
.IX Header "CONFIGURATION OPTIONS"
The \f(CW\*(C`Template::Parser\*(C'\fR module accepts the following configuration
options. Please see Template::Manual::Config for further details
on each option.
.SS "\s-1START_TAG, END_TAG\s0"
.IX Subsection "START_TAG, END_TAG"
The \s-1START_TAG\s0 and
\&\s-1END_TAG\s0 options are used to
specify character sequences or regular expressions that mark the start and end
of a template directive.
.PP
.Vb 4
\& my $parser = Template::Parser\->new({
\& START_TAG => quotemeta(\*(Aq<+\*(Aq),
\& END_TAG => quotemeta(\*(Aq+>\*(Aq),
\& });
.Ve
.SS "\s-1TAG_STYLE\s0"
.IX Subsection "TAG_STYLE"
The \s-1TAG_STYLE\s0 option can be used to set
both \s-1START_TAG\s0 and \s-1END_TAG\s0 according to pre-defined tag styles.
.PP
.Vb 3
\& my $parser = Template::Parser\->new({
\& TAG_STYLE => \*(Aqstar\*(Aq, # [* ... *]
\& });
.Ve
.SS "\s-1PRE_CHOMP, POST_CHOMP\s0"
.IX Subsection "PRE_CHOMP, POST_CHOMP"
The \s-1PRE_CHOMP\s0 and
\&\s-1POST_CHOMP\s0 can be set to remove
any whitespace before or after a directive tag, respectively.
.PP
.Vb 4
\& my $parser = Template::Parser\-E<gt>new({
\& PRE_CHOMP => 1,
\& POST_CHOMP => 1,
\& });
.Ve
.SS "\s-1INTERPOLATE\s0"
.IX Subsection "INTERPOLATE"
The \s-1INTERPOLATE\s0 flag can be set
to allow variables to be embedded in plain text blocks.
.PP
.Vb 3
\& my $parser = Template::Parser\->new({
\& INTERPOLATE => 1,
\& });
.Ve
.PP
Variables should be prefixed by a \f(CW\*(C`$\*(C'\fR to identify them, using curly braces
to explicitly scope the variable name where necessary.
.PP
.Vb 1
\& Hello ${name},
\&
\& The day today is ${day.today}.
.Ve
.SS "\s-1ANYCASE\s0"
.IX Subsection "ANYCASE"
The \s-1ANYCASE\s0 option can be set
to allow directive keywords to be specified in any case.
.PP
.Vb 4
\& # with ANYCASE set to 1
\& [% INCLUDE foobar %] # OK
\& [% include foobar %] # OK
\& [% include = 10 %] # ERROR, \*(Aqinclude\*(Aq is a reserved word
.Ve
.SS "\s-1GRAMMAR\s0"
.IX Subsection "GRAMMAR"
The \s-1GRAMMAR\s0 configuration item can be used
to specify an alternate grammar for the parser. This allows a modified or
entirely new template language to be constructed and used by the Template
Toolkit.
.PP
.Vb 1
\& use MyOrg::Template::Grammar;
\&
\& my $parser = Template::Parser\->new({
\& GRAMMAR = MyOrg::Template::Grammar\->new();
\& });
.Ve
.PP
By default, an instance of the default Template::Grammar will be
created and used automatically if a \f(CW\*(C`GRAMMAR\*(C'\fR item isn't specified.
.SS "\s-1DEBUG\s0"
.IX Subsection "DEBUG"
The \s-1DEBUG\s0 option can be used to enable
various debugging features of the \f(CW\*(C`Template::Parser\*(C'\fR module.
.PP
.Vb 1
\& use Template::Constants qw( :debug );
\&
\& my $template = Template\->new({
\& DEBUG => DEBUG_PARSER | DEBUG_DIRS,
\& });
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Andy Wardley <abw@wardley.org> <http://wardley.org/>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 1996\-2022 Andy Wardley. All Rights Reserved.
.PP
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.PP
The main parsing loop of the \f(CW\*(C`Template::Parser\*(C'\fR module was derived from a
standalone parser generated by version 0.16 of the \f(CW\*(C`Parse::Yapp\*(C'\fR module. The
following copyright notice appears in the \f(CW\*(C`Parse::Yapp\*(C'\fR documentation.
.PP
.Vb 3
\& The Parse::Yapp module and its related modules and shell
\& scripts are copyright (c) 1998 Francois Desarmenien,
\& France. All rights reserved.
\&
\& You may use and distribute them under the terms of either
\& the GNU General Public License or the Artistic License, as
\& specified in the Perl README file.
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Template, Template::Grammar, Template::Directive