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File name : nokogiri

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#!/usr/bin/ruby
require 'optparse'
require 'open-uri'
require 'uri'
require 'rubygems'
require 'nokogiri'
autoload :IRB, 'irb'

parse_class = Nokogiri
encoding = nil

# This module provides some tunables with the nokogiri CLI for use in
# your ~/.nokogirirc.
module Nokogiri::CLI
  class << self
    # Specify the console engine, defaulted to IRB.
    #
    # call-seq:
    #   require 'pry'
    #   Nokogiri::CLI.console = Pry
    attr_writer :console

def console
      case @console
      when Symbol
        Kernel.const_get(@console)
      else
        @console
      end
    end

attr_accessor :rcfile
  end

self.rcfile  = File.expand_path('~/.nokogirirc')
  self.console = :IRB
end

opts = OptionParser.new do |opts|
  opts.banner = "Nokogiri: an HTML, XML, SAX, and Reader parser"
  opts.define_head "Usage: nokogiri <uri|path> [options]"
  opts.separator ""
  opts.separator "Examples:"
  opts.separator "  nokogiri https://www.ruby-lang.org/"
  opts.separator "  nokogiri ./public/index.html"
  opts.separator "  curl -s http://www.nokogiri.org | nokogiri -e'p $_.css(\"h1\").length'"
  opts.separator ""
  opts.separator "Options:"

opts.on("--type type", "Parse as type: xml or html (default: auto)", [:xml, :html]) do |v|
    parse_class = {:xml => Nokogiri::XML, :html => Nokogiri::HTML}[v]
  end

opts.on("-C file", "Specifies initialization file to load (default #{Nokogiri::CLI.rcfile})") do |v|
    Nokogiri::CLI.rcfile = v
  end

opts.on("-E", "--encoding encoding", "Read as encoding (default: #{encoding || 'none'})") do |v|
    encoding = v
  end

opts.on("-e command", "Specifies script from command-line.") do |v|
    @script = v
  end

opts.on("--rng <uri|path>", "Validate using this rng file.") do |v|
    @rng = open(v) {|f| Nokogiri::XML::RelaxNG(f)}
  end

opts.on_tail("-?", "--help", "Show this message") do
    puts opts
    exit
  end

opts.on_tail("-v", "--version", "Show version") do
    puts Nokogiri::VersionInfo.instance.to_markdown
    exit
  end
end
opts.parse!

url = ARGV.shift

if url.to_s.strip.empty? && $stdin.tty?
  puts opts
  exit 1
end

if File.file?(Nokogiri::CLI.rcfile)
  load Nokogiri::CLI.rcfile
end

if url || $stdin.tty?
  case uri = (URI(url) rescue url)
  when URI::HTTP
    @doc = parse_class.parse(uri.read, url, encoding)
  else
    @doc = parse_class.parse(open(url).read, nil, encoding)
  end
else
  @doc = parse_class.parse($stdin, nil, encoding)
end

$_ = @doc

if @rng
  @rng.validate(@doc).each do |error|
    puts error.message
  end
else
  if @script
    eval @script, binding, '<main>'
  else
    puts "Your document is stored in @doc..."
    Nokogiri::CLI.console.start
  end
end