Sha256: 439b57488e35af90dc6363006543ba7cb6971741b7a6b40bb084f6160bd7d169
Contents?: true
Size: 693 Bytes
Versions: 16
Compression:
Stored size: 693 Bytes
Contents
module EBNF
module BNF
##
# Transform EBNF Rule set to BNF:
#
# * Add rule [0] (_empty rule (seq))
# * Transform each rule into a set of rules that are just BNF, using {Rule#to_bnf}.
# @return [ENBF] self
def make_bnf
progress("make_bnf") {"Start: #{@ast.length} rules"}
new_ast = [Rule.new(:_empty, "0", [:seq], kind: :rule)]
ast.each do |rule|
debug("make_bnf") {"expand from: #{rule.inspect}"}
new_rules = rule.to_bnf
debug(" => ") {new_rules.map(&:sym).join(', ')}
new_ast += new_rules
end
@ast = new_ast
progress("make_bnf") {"End: #{@ast.length} rules"}
self
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems