#!/usr/bin/env ruby

# Copyright (c) 2021-2024 Huawei Device Co., Ltd.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


class Output
  @@indent = 0
  @@indent_str = ""
  @@file = nil
  STEP = 4

  def self.setup(file = nil)
    @@file = file.nil? ? $stdout : File.open(file, 'w')
  end

  def self.write(line)
    @@file.write line
  end

  def self.println(line)
    @@file.write @@indent_str
    @@file.puts line
  end

  def self.puts(line = '')
    println(line)
  end

  def self.<<(line)
    println(line)
    self
  end

  def self.printlni(line)
    println line
    indent_up
  end

  def self.printlnd(line)
    indent_down
    println line
  end

  def self.scoped_puts(start_line, end_line = '}')
    puts start_line
    indent_up
    yield
    indent_down
    puts end_line
  end

  def self.indent_up
    change_indent(STEP)
  end
  def self.indent_down
    change_indent(-STEP)
  end

private
  def self.change_indent(step = 4)
    @@indent += step
    raise "Wrong indent" if @@indent < 0
    @@indent_str = " " * @@indent
  end
end