✨ Standard Library a.k.a StdLib

spec/stdlib/task_spec.cr

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+require "../spec_helper"
+require "socket"
+require "colorize"
+require "json"
+
+describe StdLib::Task do
+  it "exists" do
+    eval_js <<-JS
+        typeof(window["StdLib::Task"])
+    JS
+    ret = String.new JSC.to_string script_result
+    ret.should eq "function"
+  end
+
+  it "works" do
+    eval_js <<-JS
+        var a = new MyFileReader("README.md");
+        var task = a.read_content_async();
+        var message = "";
+        while(!(message = task.await())); //uses `task.yield();` if build without -Dpreview_mt
+        message;
+    JS
+    msg = String.new JSC.to_string script_result
+    msg.should eq File.read("README.md")
+  end
+end

src/components/web_extension/stdlib/jsc_class.cr

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+# Hah? Now you're wondering how to create Javascript classes. I know it.
+# Actually, macro `WebExtension.register_class` had been introduced since version 0.3.1 to help you enroll a plain Crystal' class into JavaScriptCore environment and uses it directly in your JS code.
+module JSCClass
+  macro included
+        INSTANCES = [] of Void*
+        @@kconstructor : Pointer(Void)? = nil
+
+        def self.last_created_instance
+            Box({{@type}}).unbox(INSTANCES.last)
+        end
+
+        def self.constructor 
+            @@kconstructor ||= WebExtension.register_class({{@type}})
+        end
+    end
+end

src/components/web_extension/stdlib/task.cr

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+include WebExtension
+
+alias JSCTypes = JSCFunction | JSCPrimative | JSCObject | JSC::JSValue
+
+class StdLib::Task < Channel(JSCTypes)
+  include JSCClass
+
+  def initialize(p)
+    super 0
+  end
+
+  def send(p)
+    super(p.to_jsc)
+    true
+  end
+
+  @[JSCInstanceMethod]
+  def wait(p)
+    while true
+      i, m = Channel.non_blocking_select(self.receive_select_action)
+      if m.is_a?(JSCTypes)
+        return m 
+      end
+    end
+  end
+
+  @[JSCInstanceMethod]
+  def await(p)
+    select
+    when m = self.receive
+      return m
+    else
+      return nil
+    end
+  end
+
+  @[JSCInstanceMethod]
+  def yield(p)
+    Fiber.yield
+  end
+end