NAME
MarpaX::ESLIF::Grammar::Symbol::Properties - ESLIF Grammar Symbol Properties
VERSION
version 2.0.31
SYNOPSIS
use MarpaX::ESLIF;
my $eslif = MarpaX::ESLIF->new();
my $data = do { local $/; <DATA> };
my $eslifGrammar = MarpaX::ESLIF::Grammar->new($eslif, $data);
my $symbolProperties = $eslifGrammar->symbolProperties(0);
my $symbolPropertiesByLevel = $eslifGrammar->symbolPropertiesByLevel(0, 0);
__DATA__
#
# This is an example of a calculator grammar
#
:start ::= Expression
:default ::= action => do_op
symbol-action => do_symbol
free-action => do_free # Supported but useless
:desc ::= 'Calculator'
:discard ::= whitespaces event => discard_whitespaces$
: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'$self->getType
Returns the type, c.f. MarpaX::ESLIF::Symbol::Type
$self->isStart
Returns if this is the start symbol
$self->getStart
Returns if this is the start symbol
Alias to isStart()
$self->isDiscard
Returns if this is the discard symbol
$self->getDiscard
Returns if this is the discard symbol
Alias to isDiscard()
$self->isDiscardRhs
Returns if this is a RHS of a discard rule
$self->isDiscardRhs
Returns if this is a RHS of a discard rule
Alias to isDiscardRhs()
$self->isLhs
Returns if this is an LHS
$self->getLhs
Returns if this is an LHS
Alias to isLhs()
$self->isTop
Returns if this is the first symbol of the grammar
$self->getTop
Returns if this is the first symbol of the grammar
Alias to isTop()
$self->getId
Returns the id
$self->getDescription
Returns the description
$self->getEventBefore
Returns the event before name, null if there is none
$self->isEventBeforeInitialState
Returns if the event before initial state is on, meaningless if there is no event before
$self->getEventBeforeInitialState
Returns if the event before initial state is on, meaningless if there is no event before
Alias to isEventBeforeInitialState()
$self->getEventAfter
Returns the event after name, null if there is none
$self->isEventAfterInitialState
Returns if the event after initial state is on, meaningless if there is no event after
$self->getEventAfterInitialState
Returns if the event after initial state is on, meaningless if there is no event after
Alias to isEventAfterInitialState()
$self->getEventPredicted
Returns the event predicted name, null if there is none
$self->isEventPredictedInitialState
Returns if the event predicted initial state is on, meaningless if there is no prediction event
$self->getEventPredictedInitialState
Returns if the event predicted initial state is on, meaningless if there is no prediction event
Alias to isEventPredictedInitialState()
$self->getEventNulled
Returns the null event name, null if there is none - used internally for ":discard[on]" and ":discard[off]" in particular
$self->isEventNulledInitialState
Returns the nulled event initial state, meaningless if there is nulled event
$self->getEventNulledInitialState
Returns the nulled event initial state, meaningless if there is nulled event
Alias isEventNulledInitialState()
$self->getEventCompleted
Returns the completion event name, null if there is none
$self->isEventCompletedInitialState
Returns the completion event initial state, meaningless if there is no completion event
$self->getEventCompletedInitialState
Returns the completion event initial state, meaningless if there is no completion event
Alias to isEventCompletedInitialState()
$self->getDiscardEvent
Returns the discard event, null if there is none
$self->isDiscardEventInitialState
Returns the discard event initial state, meaningless if there is no discard event
$self->isDiscardEventInitialState
Returns the discard event initial state, meaningless if there is no discard event
Alias to isDiscardEventInitialState()
$self->getLookupResolvedLeveli
Returns the grammar level to which it is resolved, can be different to the grammar used when this is a lexeme
$self->getPriority
Returns the symbol priority
$self->getNullableAction
Returns the nullable action, null if there is none
$self->getPropertyBitSet
Returns the low-level properties (combination of MarpaX::ESLIF::Symbol::PropertyBitSet values)
DESCRIPTION
ESLIF Grammar Symbol Properties.
Calls to grammar's currentSymbolProperties() or symbolPropertiesByLevel() methods outputs an instance of this class.
SEE ALSO
1;
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.