feat: Add coroutine parser

Gemfile.lock

@@ -1,41 +1,41 @@
 PATH
   remote: .
   specs:
-    parsby (1.0.0)
+    parsby (1.1.1)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    coderay (1.1.2)
-    diff-lcs (1.3)
+    coderay (1.1.3)
+    diff-lcs (1.5.0)
     method_source (1.0.0)
-    pry (0.13.1)
+    pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
     rake (10.5.0)
-    rspec (3.9.0)
-      rspec-core (~> 3.9.0)
-      rspec-expectations (~> 3.9.0)
-      rspec-mocks (~> 3.9.0)
-    rspec-core (3.9.2)
-      rspec-support (~> 3.9.3)
-    rspec-expectations (3.9.2)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.1)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.2)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.9.0)
-    rspec-mocks (3.9.1)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.3)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.9.0)
-    rspec-support (3.9.3)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.0)
 
 PLATFORMS
-  ruby
+  x86_64-linux
 
 DEPENDENCIES
-  bundler (~> 1.17)
+  bundler (~> 2.4)
   parsby!
-  pry
+  pry (~> 0)
   rake (~> 10.0)
   rspec (~> 3.0)
 
 BUNDLED WITH
-   1.17.1
+   2.4.6

lib/parsby.rb

@@ -609,6 +609,10 @@ def initialize(label = nil, &b)
     @parser = b
   end
 
+  def parser
+    @parser
+  end
+
   # Parse a String or IO object.
   def parse(src)
     ctx = src.is_a?(Context) ? src : Context.new(src)

lib/parsby/combinators.rb

@@ -395,5 +395,18 @@ def splicer
         end
       end
     end
+
+    # Takes a block which can run multiple parsers
+    # and use control flow to adapt itself.
+    define_combinator :coroutine do |&block|
+      Parsby.new do |target|
+
+        parse = Proc.new do |parsby|
+          parsby.parser.call target
+        end
+
+        block.call(parse)
+      end
+    end
   end
 end

parsby.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.17"
+  spec.add_development_dependency "bundler", "~> 2.4"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "pry", "~> 0"