晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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# frozen_string_literal: true

# The Prism Ruby parser.
#
# "Parsing Ruby is suddenly manageable!"
#   - You, hopefully
#
module Prism
  # There are many files in prism that are templated to handle every node type,
  # which means the files can end up being quite large. We autoload them to make
  # our require speed faster since consuming libraries are unlikely to use all
  # of these features.

  autoload :BasicVisitor, "prism/visitor"
  autoload :Compiler, "prism/compiler"
  autoload :Debug, "prism/debug"
  autoload :DesugarCompiler, "prism/desugar_compiler"
  autoload :Dispatcher, "prism/dispatcher"
  autoload :DotVisitor, "prism/dot_visitor"
  autoload :DSL, "prism/dsl"
  autoload :LexCompat, "prism/lex_compat"
  autoload :LexRipper, "prism/lex_compat"
  autoload :MutationCompiler, "prism/mutation_compiler"
  autoload :NodeInspector, "prism/node_inspector"
  autoload :RipperCompat, "prism/ripper_compat"
  autoload :Pack, "prism/pack"
  autoload :Pattern, "prism/pattern"
  autoload :Serialize, "prism/serialize"
  autoload :Visitor, "prism/visitor"

  # Some of these constants are not meant to be exposed, so marking them as
  # private here.

  private_constant :Debug
  private_constant :LexCompat
  private_constant :LexRipper

  # :call-seq:
  #   Prism::lex_compat(source, **options) -> ParseResult
  #
  # Returns a parse result whose value is an array of tokens that closely
  # resembles the return value of Ripper::lex. The main difference is that the
  # `:on_sp` token is not emitted.
  #
  # For supported options, see Prism::parse.
  def self.lex_compat(source, **options)
    LexCompat.new(source, **options).result
  end

  # :call-seq:
  #   Prism::lex_ripper(source) -> Array
  #
  # This lexes with the Ripper lex. It drops any space events but otherwise
  # returns the same tokens. Raises SyntaxError if the syntax in source is
  # invalid.
  def self.lex_ripper(source)
    LexRipper.new(source).result
  end

  # :call-seq:
  #   Prism::load(source, serialized) -> ParseResult
  #
  # Load the serialized AST using the source as a reference into a tree.
  def self.load(source, serialized)
    Serialize.load(source, serialized)
  end

  # :call-seq:
  #   Prism::parse_failure?(source, **options) -> bool
  #
  # Returns true if the source parses with errors.
  def self.parse_failure?(source, **options)
    !parse_success?(source, **options)
  end

  # :call-seq:
  #   Prism::parse_file_failure?(filepath, **options) -> bool
  #
  # Returns true if the file at filepath parses with errors.
  def self.parse_file_failure?(filepath, **options)
    !parse_file_success?(filepath, **options)
  end
end

require_relative "prism/node"
require_relative "prism/node_ext"
require_relative "prism/parse_result"
require_relative "prism/parse_result/comments"
require_relative "prism/parse_result/newlines"

# This is a Ruby implementation of the prism parser. If we're running on CRuby
# and we haven't explicitly set the PRISM_FFI_BACKEND environment variable, then
# it's going to require the built library. Otherwise, it's going to require a
# module that uses FFI to call into the library.
if RUBY_ENGINE == "ruby" and !ENV["PRISM_FFI_BACKEND"]
  require "prism/prism"
else
  require_relative "prism/ffi"
end