Contents

require 'yaml'
require_relative "sexpr/version"
require_relative "sexpr/errors"
require_relative "sexpr/node"
require_relative "sexpr/grammar"
require_relative "sexpr/matcher"
require_relative "sexpr/parser"
require_relative "sexpr/processor"
require_relative "sexpr/rewriter"
#
# A helper to manipulate sexp grammars
#
module Sexpr
  extend Grammar::Tagging

  YAML_OPTIONS = { :permitted_classes => %w[Regexp], :aliases => true }

  PathLike = lambda{|x|
    x.respond_to?(:to_path) or (x.is_a?(String) and File.exist?(x))
  }

  def self.load(input, options = {})
    case input
    when PathLike then load_file   input, options
    when String   then load_string input, options
    when Hash     then load_hash   input, options
    else
      raise ArgumentError, "Invalid argument for Sexpr::Grammar: #{input}"
    end
  end

  def self.load_file(input, options = {})
    path = input.to_path rescue input.to_s
    load_hash load_yaml(File.read(path)), options.merge(:path => input)
  end

  def self.load_string(input, options = {})
    load_hash load_yaml(input), options
  end

  def self.load_hash(input, options = {})
    raise ArgumentError, "Invalid grammar definition: #{input}" unless Hash===input
    Grammar.new input, options
  end

  def self.load_yaml(source)
    if YAML.name == 'Psych' && Psych::VERSION >= '3.1'
      YAML.safe_load(source, **YAML_OPTIONS)
    else
      YAML.load(source)
    end
  end
end # module Sexpr

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
sexpr-1.1.0	lib/sexpr.rb