Module: LINE

Includes:
BELParser::Parsers::BELScript, BELParser::Parsers::Common, BELParser::Parsers::Expression
Defined in:
lib/bel_parser/parsers/line_parser.rb

Overview

Top-level LINE module.

Constant Summary collapse

BEL_PARSERS = 
[
  BELParser::Parsers::Common::BlankLine,
  BELParser::Parsers::Common::CommentLine,
  BELParser::Parsers::Common::Identifier,
  BELParser::Parsers::Common::String,
  BELParser::Parsers::Common::List,
  BELParser::Parsers::Common::Function,
  BELParser::Parsers::Expression::Parameter,
  BELParser::Parsers::Expression::Term,
  BELParser::Parsers::Expression::Relationship,
  BELParser::Parsers::Expression::Comment,
  BELParser::Parsers::Expression::ObservedTerm,
  BELParser::Parsers::Expression::SimpleStatement,
  BELParser::Parsers::Expression::NestedStatement,
  BELParser::Parsers::BELScript::DefineAnnotation,
  BELParser::Parsers::BELScript::DefineNamespace,
  BELParser::Parsers::BELScript::Set,
  BELParser::Parsers::BELScript::Unset
].freeze

Class Method Summary collapse

Class Method Details

.map_comment_line(string) ⇒ Object 



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# File 'lib/bel_parser/parsers/line_parser.rb', line 76

def self.map_comment_line(string)
  if LINE.match_comment_line(string)
    nil
  else
    string
  end
end

.map_empty_line(string) ⇒ Object 



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# File 'lib/bel_parser/parsers/line_parser.rb', line 68

def self.map_empty_line(string)
  if LINE.match_empty_line(string)
    nil
  else
    string
  end
end

.match_comment_line(string) ⇒ Object 



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# File 'lib/bel_parser/parsers/line_parser.rb', line 88

def self.match_comment_line(string)
  string =~ /^\s*#/
end

.match_empty_line(string) ⇒ Object 



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# File 'lib/bel_parser/parsers/line_parser.rb', line 84

def self.match_empty_line(string)
  string =~ /^\s*$/
end

.normalize_line_terminators(string) ⇒ Object 



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# File 'lib/bel_parser/parsers/line_parser.rb', line 63

def self.normalize_line_terminators(string)
  return nil unless string
  string.strip + "\n"
end

.parse(io) ⇒ Object

rubocop:disable MethodLength, AbcSize



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# File 'lib/bel_parser/parsers/line_parser.rb', line 32

def self.parse(io)
  # single line transform
  line_enum = io
              .each_line
              .lazy
              .map { |line| LINE.normalize_line_terminators(line) }

  # multi-line transform
  loop do
    begin
      line = line_enum.next

      while line.end_with?("\\\n")
        line.chomp!("\\\n")
        line += line_enum.next
      end

      BEL_PARSERS.each do |parser|
        # rubocop:disable BlockDelimiters
        parser.parse(line) { |obj|
          puts "parser: #{parser.inspect},"\
               "line: #{line.strip},"\
               "object: \n#{obj.inspect}"
        }
      end
    rescue StopIteration
      return
    end
  end
end