Add bin and edit workflow

bin/gems/ffi-1.17.1-x86_64-linux-gnu/lib/ffi/tools/generator.rb

@@ -0,0 +1,105 @@
+require 'ffi/tools/struct_generator'
+require 'ffi/tools/const_generator'
+
+module FFI
+
+  ##
+  # Generate files with C structs for FFI::Struct and C constants.
+  #
+  # == A simple example
+  #
+  # In file +zlib.rb.ffi+:
+  #   module Zlib
+  #     @@@
+  #     constants do |c|
+  #       c.include "zlib.h"
+  #       c.const :ZLIB_VERNUM
+  #     end
+  #     @@@
+  #
+  #     class ZStream < FFI::Struct
+  #
+  #       struct do |s|
+  #         s.name "struct z_stream_s"
+  #         s.include "zlib.h"
+  #
+  #         s.field :next_in,   :pointer
+  #         s.field :avail_in,  :uint
+  #         s.field :total_in,  :ulong
+  #       end
+  #       @@@
+  #     end
+  #   end
+  #
+  # Translate the file:
+  #   require "ffi/tools/generator"
+  #   FFI::Generator.new "zlib.rb.ffi", "zlib.rb"
+  #
+  # Generates the file +zlib.rb+ with constant values and offsets:
+  #   module Zlib
+  #   ZLIB_VERNUM = 4784
+  #
+  #   class ZStream < FFI::Struct
+  #     layout :next_in, :pointer, 0,
+  #            :avail_in, :uint, 8,
+  #            :total_in, :ulong, 16
+  #   end
+  #
+  # @see FFI::Generator::Task for easy integration in a Rakefile
+  class Generator
+
+    def initialize(ffi_name, rb_name, options = {})
+      @ffi_name = ffi_name
+      @rb_name = rb_name
+      @options = options
+      @name = File.basename rb_name, '.rb'
+
+      file = File.read @ffi_name
+
+      new_file = file.gsub(/^( *)@@@(.*?)@@@/m) do
+        @constants = []
+        @structs = []
+
+        indent = $1
+        original_lines = $2.count "\n"
+
+        instance_eval $2, @ffi_name, $`.count("\n")
+
+        new_lines = []
+        @constants.each { |c| new_lines << c.to_ruby }
+        @structs.each { |s| new_lines << s.generate_layout }
+
+        new_lines = new_lines.join("\n").split "\n" # expand multiline blocks
+        new_lines = new_lines.map { |line| indent + line }
+
+        padding = original_lines - new_lines.length
+        new_lines += [nil] * padding if padding >= 0
+
+        new_lines.join "\n"
+      end
+
+      open @rb_name, 'w' do |f|
+        f.puts "# This file is generated from `#{@ffi_name}'. Do not edit."
+        f.puts
+        f.puts new_file
+      end
+    end
+
+    def constants(options = {}, &block)
+      @constants << FFI::ConstGenerator.new(@name, @options.merge(options), &block)
+    end
+
+    def struct(options = {}, &block)
+      @structs << FFI::StructGenerator.new(@name, @options.merge(options), &block)
+    end
+
+    ##
+    # Utility converter for constants
+
+    def to_s
+      proc { |obj| obj.to_s.inspect }
+    end
+
+  end
+end
+