Merge #15

15: Enhance `Wasmer::XxxArray` r=Hywan a=irxground

ref: #14
Now `Wasmer::XxxArray` has `each` method and include `Enumerable` module.

> The Enumerable mixin provides collection classes with several traversal and searching methods, and with the ability to sort. The class must provide a method each, which yields successive members of the collection.
https://docs.ruby-lang.org/en/2.6.0/Enumerable.html


Co-authored-by: irxground <irxnjhtchlnrw@gmail.com>

src/lib.rs

@@ -104,7 +104,11 @@ pub extern "C" fn Init_wasmer() {
 
  // Declare the `[]` (get) method.
  itself.def("[]", memory::view::$mod_name::ruby_memory_view_get);
- });
+
+ // Declare the `each` method.
+ itself.def("each", memory::view::$mod_name::ruby_memory_view_each);
+ })
+ .include("Enumerable");
  };
  }
 

src/memory/view.rs

@@ -9,7 +9,7 @@ macro_rules! memory_view {
  use lazy_static::lazy_static;
  use rutie::{
  class, methods, wrappable_struct, AnyException, Exception, Fixnum, Integer,
- NilClass, Object,
+ NilClass, Object, VM,
  };
  use std::{mem::size_of, rc::Rc};
  use wasmer_runtime as runtime;
@@ -71,6 +71,15 @@ macro_rules! memory_view {
  Ok(view[offset + index].get())
  }
  }
+
+ pub fn each(&self) {
+ let view = self.memory.view::<$wasm_type>();
+
+ for nth in self.offset..view.len() {
+ let value = view[nth].get() as i64;
+ VM::yield_object(Integer::from(value));
+ }
+ }
  }
 
  wrappable_struct!(MemoryView, MemoryViewWrapper, MEMORY_VIEW_WRAPPER);
@@ -117,6 +126,12 @@ macro_rules! memory_view {
  ))
  })
  }
+
+ fn ruby_memory_view_each() -> RubyMemoryView {
+ let memory_view = _itself.get_data(&*MEMORY_VIEW_WRAPPER);
+ memory_view.each();
+ _itself
+ }
  );
  }
  };

tests/memory_test.rb

@@ -99,20 +99,28 @@ def test_hello_world
  nth = 0
  string = ""
 
- while true
- char = memory[nth]
-
- if 0 == char
- break
- end
-
- string += char.chr
+ memory.each do |char|
+ break if 0 == char
+ string << char.chr
  nth += 1
  end
 
+ assert_equal 13, nth
  assert_equal "Hello, World!", string
  end
 
+ def test_enumerable
+ instance = Wasmer::Instance.new self.bytes
+ memory = instance.memory.int16_view
+ memory[0] = 1
+ memory[1] = 10
+ memory[2] = 100
+ memory[3] = 1000
+ memory[5] = 2
+ sum = memory.take_while{|x| x > 0}.inject(0, &:+)
+ assert_equal 1111, sum
+ end
+
  def test_views_share_the_same_buffer
  instance = Wasmer::Instance.new self.bytes
  int8 = instance.memory.int8_view