test-bug fixed (missing x for DirectiveRegexp). Tests added.

Gemfile.lock

@@ -0,0 +1,34 @@
+PATH
+  remote: .
+  specs:
+    iounpack (0.2.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.3)
+    rake (12.3.3)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.1)
+      rspec-support (~> 3.9.1)
+    rspec-expectations (3.9.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  iounpack!
+  rake (~> 12.0)
+  rspec (~> 3.2)
+
+BUNDLED WITH
+   2.1.4

iounpack.gemspec

@@ -18,6 +18,8 @@ Gem::Specification.new do |spec|
 	spec.metadata["source_code_uri"] = spec.homepage
 	spec.metadata["changelog_uri"] = spec.homepage
 
+	spec.add_development_dependency "rspec", "~> 3.2"
+
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do

lib/iounpack.rb

@@ -68,17 +68,18 @@ class IOUnpack
       Directives[dir.directive.to_s] = dir
       Regexp.quote dir.directive
     end.join( '|')+')'
-	DirectiveRegexp = /\A\s* (?<directive> #{DirectivePattern} ) \s* (?<count> \d+)? \s*/m
+	DirectiveRegexp = /\A\s* (?<directive> #{DirectivePattern} ) \s* (?<count> \d+)? \s*/mx
+
+	attr_reader :len, :pattern
 
   def initialize pattern
-    @order, @len, @pattern = [], 0, pattern
+    @len, @pattern = 0, pattern
     loop do
       case pattern
       when /\A\s*\z/m then break
       when DirectiveRegexp
         pattern = $'
         m = [Directives[$~[:directive]], $~[:count] ? $~[:count].to_i : 1]
-        @order.push m
         @len += m.first * m.last
       else
         raise ArgumentError, "Unknown token: #{pattern[0]}"

spec/iounpack_spec.rb

@@ -0,0 +1,28 @@
+require 'iounpack'
+
+describe IOUnpack do
+	it 'has nothing to read, if empty directives' do
+		expect( IOUnpack.new('').len).to eql(0)
+	end
+
+	<<EOF.each_line do |l|
+1 c
+2 cc
+2 c2
+2  cc
+2  c c
+3  cc c
+4  cc c2
+4  c3c
+14 c13c
+14 c13 c
+16 q>q<
+19 q>2c3
+19 q>2  c3
+EOF
+		/\A(\d+) (.*)/
+		it "wants read #$2 bytes for '#$1'" do
+			expect( IOUnpack.new('cc').len).to eql(2)
+		end
+	end
+end