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

# Changes! /usr/local/bin/perl -w

use Parse::RecDescent;

local $/;
my $parse = Parse::RecDescent->new(<DATA>);

my $grammar = <>;

$tree = parse->grammar($grammar) or die "Bad grammar! No biscuit!";

print Data::Dumper->Dump([$tree]);

__DATA__

grammar    : prerule(s?) components(s?) /\Z/

component  : rule
	   | comment

rule       : <skip:""> "\n" <skip: '[ \t]'> identifier ":"
	     <skip: $item[1]> production(s? /|/)

production : items(s)

item       : lookahead(s?) simpleitem
           | directive
           | comment

lookahead  : '...' | '...!'                   # +'ve or -'ve lookahead

simpleitem : subrule args(?) rep(?)           # match another rule
           | terminal                         # match the next input
           | bracket args(?)                  # match alternative items
           | action                           # do something

subrule    : identifier                       # the name of the rule

args       : {extract_codeblock($_[0],'[]')}  # just like a [...] array ref

rep	   : '(' repspec ')'

repspec	   : '?'                              # 0 or 1 times
           | 's?'                             # 0 or more times
           | 's'                              # 1 or more times
           | /(\d+)[.][.](/\d+)/              # $1 to $2 times
           | /[.][.](/\d*)/                   # at most $1 times
           | /(\d*)[.][.])/                   # at least $1 times

action     : <perl_codeblock>		      # embedded Perl code

bracket    : '(' production(s? /|/) ')'       # alternative subrules

directive  : '<commit>'                       # commit to production
           | '<uncommit>'                     # cancel commitment
           | '<resync>'                       # skip to newline
           | '<resync:' pattern '>'           # skip <pattern>
           | '<reject>'                       # fail this production
           | '<reject:' condition '>'         # fail if <condition>
           | '<error>'                        # report an error
           | '<error:' string '>'             # report error as "<string>"
           | '<error?>'                       # error only if committed
           | '<error?:' string '>'            #   "    "    "    "
           | '<rulevar:' /[^>]+/ '>'          # define rule-local variable
           | '<matchrule:' string '>'         # invoke rule named in string

identifier : /[a-z]\w*/i                      # must start with alpha

comment    : /#[^\n]*/                        # same as Perl

pattern    : {extract_bracketed($text,'<')}   # allow embedded "<..>"

condition  : {extract_codeblock($text,'{<')}  # full Perl expression

string     : {extract_variable($text)}        # any Perl variable
           | {extract_quotelike($text)}       #   or quotelike string
           | {extract_bracketed($text,'<')}   #   or balanced brackets

[-] 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]