Pugs::Grammar::Precedence - Engine for Perl 6 Rule operator precedence
use Pugs::Grammar::Precedence; # example definition for "sub rxinfix:<|> ..." my $rxinfix = Pugs::Grammar::Precedence->new( grammar => 'rxinfix', ); $rxinfix->add_op( name => '|', assoc => 'left', fixity => 'infix', );
Pseudo-code for usage inside a grammar:
sub new_proto( $match ) { return ${$match<category>}.add_op( name => $match<name>, fixity => ..., precedence => ..., ); } rule prototype { proto <category>:<name> <options> { return new_proto($/); } } rule statement { <category.parse> ... }
This module provides an implementation for Perl 6 operator precedence.
Class method. Returns a category object.
options:
grammar => $category_name - the name of this category (a namespace or a Grammar name).
grammar => $category_name
Instance method. Adds a new operator to the category.
name => $operator_name - the name of this operator, such as '+', '*'
name2 => $operator_name - the name of the second operator in an operator pair, such as circumfix [ '(', ')' ] or ternary [ '??', '!!' ].
# precedence=>'tighter', # tighter/looser/equiv # other=>'+', # fixity => # infix/prefix/circumfix/postcircumfix/ternary # assoc => # left/right/non/chain/list # rule=>$rule # (is parsed)
The Pugs Team <perl6-compiler@perl.org>.
Summary of Perl 6 Operators: http://dev.perl.org/perl6/doc/design/syn/S03.html
Copyright 2006, 2007 by Flavio Soibelmann Glock and others.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See http://www.perl.com/perl/misc/Artistic.html
To install Pugs::Compiler::Rule, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Pugs::Compiler::Rule
CPAN shell
perl -MCPAN -e shell install Pugs::Compiler::Rule
For more information on module installation, please visit the detailed CPAN module installation guide.