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PATH: usr / share / doc / perl-Parse-RecDescent-1.967009 / demo

use Parse::RecDescent;

#$RD_TRACE = 1;
#$RD_HINT = 1;

my $parser = Parse::RecDescent->new(<<'EOGRAMMAR');

<autoaction: { bless \%item, $item{__RULE__} } >

file:		element(s)

element:	command | literal

command:	'\\' literal options(?) args(?)

options:	'[' option(s? /,/) ']'

args:		'{' element(s?) '}'

option:		/[^][\\$&%#_{}~^ \t\n,]+/

literal:	/[^][\\$&%#_{}~^ \t\n]+/

EOGRAMMAR

local $/;
my $tree = $parser->file(<DATA>);

use Data::Dumper 'Dumper';
warn Dumper [ $tree ];

$tree->explain(0);

sub file::explain
{
	my ($self, $level) = @_;
	for (@{$self->{'element(s)'}})
	{
		$_->explain($level);
		print "\n";
	}
}

sub element::explain
{
	my ($self, $level) = @_;
	($self->{command}||$self->{literal})->explain($level)
}

sub command::explain
{
	my ($self, $level) = @_;
	print "\t"x$level, "Command: $self->{literal}{__PATTERN1__}\n";
	print "\t"x$level, "\tOptions:\n";
	$self->{'options(?)'}[0]->explain($level+2) if @{$self->{'options(?)'}};
	print "\t"x$level, "\tArgs:\n";
	$self->{'args(?)'}[0]->explain($level+2) if @{$self->{'args(?)'}};
}

sub options::explain
{
	my ($self, $level) = @_;
	$_->explain($level) foreach @{$self->{'option(s?)'}};
}

sub args::explain
{
	my ($self, $level) = @_;
	$_->explain($level) foreach @{$self->{'element(s?)'}};
}

sub option::explain
{
	my ($self, $level) = @_;
	print "\t"x$level, "Option: $self->{__PATTERN1__}\n";
}

sub literal::explain
{
	my ($self, $level) = @_;
	print "\t"x$level, "Literal: $self->{__PATTERN1__}\n";
}

__DATA__

\documentclass[a4paper,11pt]{article}
\usepackage{latexsym}
\author{D. Conway}
\title{Parsing \LaTeX{}}
\begin{document}
\maketitle
\tableofcontents
\section{Description}
...is easy \footnote{But not \emph{necessarily} simple}.
\end{document}

[-] demo_cpp.pl [edit]
[-] demo_autorule.pl [edit]
[-] demo_errors.pl [edit]
[-] demo_piecewise.pl [edit]
[-] demo_logic.pl [edit]
[-] demo_skipcomment.pl [edit]
[-] demo_implicit.pl [edit]
[-] demo_separators.pl [edit]
[-] demo_perlparsing.pl [edit]
[-] demo_street.pl [edit]
[-] demo_scoredsep.pl [edit]
[-] demo.c [edit]
[-] demo_textgen.pl [edit]
[-] demo.pl [edit]
[-] demo_calc.pl [edit]
[+] ..
[-] demo_another_Cgrammar.pl [edit]
[-] demo_matchrule2.pl [edit]
[-] demo_mccoy.pl [edit]
[-] demo_restructure_painful.pl [edit]
[-] demo_methods.pl [edit]
[-] demo_language.pl [edit]
[-] demo_selfmod.pl [edit]
[-] demo_OOautoparsetree.pl [edit]
[-] demo_codeblock.pl [edit]
[-] demo_simplequery.pl [edit]
[-] demo_restructure_easy.pl [edit]
[-] demo_tokens.pl [edit]
[-] demo_decomment.pl [edit]
[-] demo_recipe.pl [edit]
[-] demo_delete.pl [edit]
[-] demo_lisplike.pl [edit]
[-] demo_bad.pl [edit]
[-] demo_arithmetic.pl [edit]
[-] demo_leftassoc.pl [edit]
[-] demo_PerlCSV.pl [edit]
[-] demo_metaRD.pm [edit]
[-] demo_derived.pl [edit]
[-] demo_opreps.pl [edit]
[-] demo_matchrule.pl [edit]
[-] demo_LaTeXish_autoact.pl [edit]
[-] demo_operator.pl [edit]
[-] demo_autoscoresep.pl [edit]
[-] demo_Cgrammar_v2.pl [edit]
[-] demo_NL2SQL.pl [edit]
[-] demo_Cgrammar.pl [edit]
[-] demo_randomsentence.pl [edit]
[-] demo_template.pl [edit]
[-] demo_quicklist.pl [edit]
[-] demo_itemhash.pl [edit]
[-] demo_buildcalc.pl [edit]
[-] demo_leftop.pl [edit]
[-] demo_decomment_nonlocal.pl [edit]
[-] demo_dot.pl [edit]
[-] demo_LaTeXish.pl [edit]
[-] demo_precalc.pl [edit]
[-] demo_eval.pl [edit]
[-] demo_autostub.pl [edit]
[-] demo_whoson.pl [edit]
[-] demo_lexer.pl [edit]
[-] demo_OOparsetree.pl [edit]
[-] demo_parsetree.pl [edit]
[-] demo_simple.pl [edit]
[-] demo_embedding.pl [edit]
[-] demo_simpleXML.pl [edit]
[-] demo_undumper.pl [edit]