NAME
MarpaX::ESLIF::Grammar::Properties - ESLIF Grammar Properties
VERSION
version 3.0.4
SYNOPSIS
use MarpaX::ESLIF;
my $eslif = MarpaX::ESLIF->new();
my $data = do { local $/; <DATA> };
my $eslifGrammar = MarpaX::ESLIF::Grammar->new($eslif, $data);
my $grammarProperties = $eslifGrammar->currentProperties;
my $grammarPropertiesByLevel = $eslifGrammar->propertiesByLevel(0);
__DATA__
#
# This is an example of a calculator grammar
#
:start ::= Expression
:default ::= action => do_op
symbol-action => do_symbol
free-action => do_free # Supported but useless
:desc ::= 'Calculator'
:discard ::= whitespaces event => discard_whitespaces$
:discard ::= comment event => discard_comment$
event ^Number = predicted Number
event Number$ = completed Number
Number ::= NUMBER action => ::shift
event Expression$ = completed Expression
event ^Expression = predicted Expression
Expression ::=
Number action => do_int
| '(' Expression ')' assoc => group action => ::copy[1]
|| Expression '**' Expression assoc => right
|| Expression '*' Expression
| Expression '/' Expression
|| Expression '+' Expression
| Expression '-' Expression
whitespaces ::= WHITESPACES
comment ::= /(?:(?:(?:\/\/)(?:[^\n]*)(?:\n|\z))|(?:(?:\/\*)(?:(?:[^\*]+|\*(?!\/))*)(?:\*\/)))/u
:lexeme ::= NUMBER pause => before event => ^NUMBER
:lexeme ::= NUMBER pause => after event => NUMBER$
:desc ~ 'Calculator Tokens'
NUMBER ~ /[\d]+/ name => 'NUMBER Lexeme'
WHITESPACES ~ [\s]+ name => 'WHITESPACES Lexeme'DESCRIPTION
ESLIF Grammar Properties.
Calls to grammar's currentProperties() or propertiesByLevel() methods outputs an instance of this class.
METHODS
MarpaX::ESLIF::Grammar::Properties->new(%args)
Creation of an ESLIFGrammarProperties instance, noted $self afterwards. %args is a hash that should contain:
- level
-
Grammar level
- maxLevel
-
Maximum grammar level
- description
-
Grammar description
- latm
-
Grammar is in LATM (Longest Accepted Token Mode) ?
- defaultSymbolAction
-
Grammar default symbol action
- defaultRuleAction
-
Grammar default rule action
- startId
-
Start symbol Id
- discardId
-
Discard symbol Id
- symbolIds
-
Symbol Ids (array reference)
- ruleIds
-
Rule Ids (array reference)
$self->getLevel
Returns grammar's level
$self->getMaxLevel
Returns maximum grammar's level
$self->getDescription
Returns grammar's description
$self->isLatm
Returns a boolean that indicates if this grammar is in the LATM (Longest Acceptable Token Mode) or not
$self->getLatm
Alias to isLatm()
$self->getDefaultSymbolAction
Returns grammar's default symbol action, never null
$self->getDefaultRuleAction
Returns grammar's default rule action, can be null
$self->getStartId
Returns grammar's start symbol id, always >= 0
$self->getDiscardId
Returns grammar's discard symbol id, < 0 if none.
$self->getSymbolIds
Returns a reference to a list of symbol identifiers
$self->getRuleIds
Returns a reference to a list of rule identifiers
AUTHOR
Jean-Damien Durand <jeandamiendurand@free.fr>
COPYRIGHT AND LICENSE
This software is copyright (c) 2017 by Jean-Damien Durand.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.