1  # Copyright (C) 2018 Apple Inc. All rights reserved.
  2  #
  3  # Redistribution and use in source and binary forms, with or without
  4  # modification, are permitted provided that the following conditions
  5  # are met:
  6  # 1. Redistributions of source code must retain the above copyright
  7  #    notice, this list of conditions and the following disclaimer.
  8  # 2. Redistributions in binary form must reproduce the above copyright
  9  #    notice, this list of conditions and the following disclaimer in the
 10  #    documentation and/or other materials provided with the distribution.
 11  #
 12  # THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 13  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 14  # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 15  # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 16  # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 17  # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 18  # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 19  # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 20  # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 21  # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 22  # THE POSSIBILITY OF SUCH DAMAGE.
 23  
 24  require 'date'
 25  require 'digest'
 26  
 27  $LICENSE = <<-EOF
 28  Copyright (C) #{Date.today.year} Apple Inc. All rights reserved.
 29  
 30  Redistribution and use in source and binary forms, with or without
 31  modification, are permitted provided that the following conditions
 32  are met:
 33  
 34  1.  Redistributions of source code must retain the above copyright
 35      notice, this list of conditions and the following disclaimer.
 36  2.  Redistributions in binary form must reproduce the above copyright
 37      notice, this list of conditions and the following disclaimer in the
 38      documentation and/or other materials provided with the distribution.
 39  
 40  THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 41  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 42  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 43  DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 44  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 45  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 46  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 47  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 48  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 49  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 50  EOF
 51  
 52  module GeneratedFile
 53      class Template < Struct.new(:multiline_comment, :line_comment, :prefix, :suffix, :body)
 54          def initialize
 55              super(["/*", " *", "*/"], "// ", nil, nil, nil)
 56          end
 57      end
 58  
 59      def self.create(filename, *dependencies)
 60          template = Template.new
 61          yield template
 62  
 63          file = File.open(filename, "w")
 64          self.license(file, template, dependencies)
 65  
 66          unless template.prefix.nil?
 67              write(file, template.prefix.to_s, "\n")
 68          end
 69          unless template.body.nil?
 70              write(file, template.body.to_s, "\n")
 71          end
 72          unless template.suffix.nil?
 73              write(file, template.suffix.to_s, "\n")
 74          end
 75  
 76          file.fsync
 77          self.sha1(file, template, dependencies)
 78      end
 79  
 80      def self.sha1(file, template, dependencies)
 81          write(file, template.line_comment, " SHA1Hash: ", Digest::SHA1.hexdigest(dependencies.join), "\n")
 82      end
 83  
 84      def self.license(file, template, dependencies)
 85          unless template.multiline_comment.nil?
 86              write(file, template.multiline_comment[0], "\n")
 87          end
 88  
 89          comment = if template.multiline_comment.nil? then template.line_comment else template.multiline_comment[1] end
 90          write(file, $LICENSE.strip.split("\n").map { |line| "#{comment} #{line}" }.join("\n"), "\n\n")
 91          write(file, comment, " Autogenerated, do not modify.\n")
 92  
 93          unless template.multiline_comment.nil?
 94              write(file, template.multiline_comment[2], "\n")
 95          end
 96  
 97          write(file, "\n")
 98      end
 99  
100      def self.write(file, *strings)
101          file.write(strings.map(&:to_s).join)
102      end
103  end
104