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Size: 1.31 KB
Versions: 93
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Stored size: 1.31 KB
Contents
require_relative '../ast_filter'
module BELParser
module Expression
# Filter will enumerate {BELParser::Parsers::AST::Node AST nodes} that make
# up BEL expressions. It selects the relevant nodes
# from an {BELParser::Parsers::AST::Node AST node} enumerator.
class Filter
# Represents BEL expression node types.
TYPES = [
:simple_statement,
:observed_term,
:nested_statement,
:term,
:parameter
]
def initialize(ast_enum)
@ast_filter = BELParser::ASTFilter.new(ast_enum, *TYPES)
end
def each(&block)
if block_given?
@ast_filter.each(&block)
else
enum_for(:each)
end
end
end
def self.filter
BELParser::ASTFilter.new(nil, *Filter::TYPES)
end
def self.parameter_filter
BELParser::ASTFilter.new(
nil,
BELParser::Parsers::AST::Parameter.ast_type)
end
def self.term_filter
BELParser::ASTFilter.new(
nil,
BELParser::Parsers::AST::Term.ast_type)
end
def self.statement_filter
BELParser::ASTFilter.new(
nil,
BELParser::Parsers::AST::SimpleStatement.ast_type,
BELParser::Parsers::AST::ObservedTerm.ast_type,
BELParser::Parsers::AST::NestedStatement.ast_type)
end
end
end
Version data entries
93 entries across 93 versions & 1 rubygems