Sha256: 06684b5cdc989149f9ad7e0770bf534992fdd3da325564c4fbaf746074158064
Contents?: true
Size: 1.05 KB
Versions: 14
Compression:
Stored size: 1.05 KB
Contents
module EBNF
module PEG
autoload :Parser, 'ebnf/peg/parser'
autoload :Rule, 'ebnf/peg/rule'
##
# Transform EBNF Rule set for PEG parsing:
#
# * Transform each rule into a set of sub-rules extracting unnamed sequences into new rules, using {Rule#to_peg}.
# @return [ENBF] self
def make_peg
progress("make_peg") {"Start: #{@ast.length} rules"}
new_ast = []
ast.each do |rule|
debug("make_peg") {"expand from: #{rule.inspect}"}
new_rules = rule.to_peg
debug(" => ") {new_rules.map(&:sym).join(', ')}
new_ast += new_rules
end
@ast = new_ast
progress("make_peg") {"End: #{@ast.length} rules"}
self
end
##
# Output Ruby parser files for PEG parsing
#
# @param [IO, StringIO] output
def to_ruby_peg(output, **options)
output.puts " RULES = ["
ast.each do |rule|
output.puts " " + rule.to_ruby + (rule.is_a?(EBNF::PEG::Rule) ? '.extend(EBNF::PEG::Rule)' : '') + ','
end
output.puts " ]"
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems