Class: TreeRepl::Repl

Inherits:
Object
  • Object
show all
Defined in:
lib/treerepl/repl.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(root_class) ⇒ Repl

Returns a new instance of Repl.



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# File 'lib/treerepl/repl.rb', line 13

def initialize(root_class)
  @root_class = root_class
  @finder = nil
  @commands = [Ls,Cd,Pwd,Use,Help,Quit,Cat].map {|cls| cls.new self}
end

Instance Attribute Details

#commands ⇒ Object

Returns the value of attribute commands.



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# File 'lib/treerepl/repl.rb', line 6

def commands
  @commands
end

#cur ⇒ Object

Returns the value of attribute cur.



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# File 'lib/treerepl/repl.rb', line 7

def cur
  @cur
end

#finder ⇒ Object

String -> TreeNode



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# File 'lib/treerepl/repl.rb', line 11

def finder
  @finder
end

#root ⇒ Object (readonly)

Returns the value of attribute root.



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# File 'lib/treerepl/repl.rb', line 5

def root
  @root
end

#root_class ⇒ Object

Returns the value of attribute root_class.



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# File 'lib/treerepl/repl.rb', line 8

def root_class
  @root_class
end

Instance Method Details

#add_command(command_class) ⇒ Object 



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# File 'lib/treerepl/repl.rb', line 19

def add_command(command_class)
  @commands << command_class.new(self)
end

#cwd ⇒ Object

void -> string



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# File 'lib/treerepl/repl.rb', line 113

def cwd
  path(root,cur).map {|n| n.name}.join('/')
end

#eval_path(node, path) ⇒ Object

TreeNode string -> TreeNode



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# File 'lib/treerepl/repl.rb', line 78

def eval_path(node,path)
  path = '.' if not path or path == ''
  if path =~ /^\//
    args = ['/'] + path.gsub(/^\/+/,'').split(/\//)
  else
    args = path.split /\//
  end
  trav = node
  args.each do |arg|
    case arg
    when '.'
      trav = trav
    when '..'
      trav = trav.parent
    when '/'
      trav = root
    else
      found = false
      trav.children.each do |n|
        if n.name == arg
          trav = n
          found = true
          break
        end
      end
      if not found
        STDERR.puts 'Invalid path: ' + path
        return nil
      end
    end
  end
  return trav
end

#loop(strings2cmds) ⇒ Object 



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# File 'lib/treerepl/repl.rb', line 34

def loop(strings2cmds)
  print cwd + '> '
  orig_line = STDIN.readline.strip
  line = orig_line.split(/ /)
  return false if line.empty?
  str = line.shift.downcase
  return true if str == 'quit'
  if not cur
    if str != 'use' and str != 'help'
      STDERR.puts 'You must set a user with \'use\' before anything else.'
      return
    end
  end
  args = line
  cmd = strings2cmds[str]
  if cmd
    begin
      cmd.exec args
    rescue Exception => e
      STDERR.puts 'Trouble executing: ' + orig_line
      raise e
    end
  else
    STDERR.puts 'Unknown command: ' + str
  end
  return false
end

#main(root) ⇒ Object

TreeNode -> Void



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# File 'lib/treerepl/repl.rb', line 28

def main(root)
  use root
  strings2cmds = {}
  commands.each do |cmd|
    strings2cmds[cmd.name] = cmd
  end
  def loop(strings2cmds)
    print cwd + '> '
    orig_line = STDIN.readline.strip
    line = orig_line.split(/ /)
    return false if line.empty?
    str = line.shift.downcase
    return true if str == 'quit'
    if not cur
      if str != 'use' and str != 'help'
        STDERR.puts 'You must set a user with \'use\' before anything else.'
        return
      end
    end
    args = line
    cmd = strings2cmds[str]
    if cmd
      begin
        cmd.exec args
      rescue Exception => e
        STDERR.puts 'Trouble executing: ' + orig_line
        raise e
      end
    else
      STDERR.puts 'Unknown command: ' + str
    end
    return false
  end
  while true
    break if loop strings2cmds
  end
end

#node_relative_to(node, name) ⇒ Object

TreeNode string -> TreeNode



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# File 'lib/treerepl/repl.rb', line 118

def node_relative_to(node,name)
  if name == '.'
    return node
  elsif name == '..'
    return node.parent
  elsif name == '/'
    return root
  else
    node.children.each do |n|
      if name == n.name
        return n
      end
    end
  end
  return nil
end

#path(from, dest) ⇒ Object

TreeNode TreeNode -> TreeNode[]



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# File 'lib/treerepl/repl.rb', line 136

def path(from,dest)
  res = []
  trav = dest
  while trav
    res.push trav
    break if trav == from
    trav = trav.parent
  end
  return res.reverse
end

#use(user) ⇒ Object

‘Private’



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# File 'lib/treerepl/repl.rb', line 70

def use(user)
  if user
    @cur = user
    @root = user
  end
end