[ADD] converter of button_pressed? function

Author: rikutons

src/lib/ruby-to-blocks-converter/microbit.js

@@ -1,10 +1,48 @@
 /* global Opal */
 import _ from 'lodash';
 
+const MicroBit = 'microbit';
 /**
  * MicroBit converter
  */
 const MicroBitConverter = {
+    // eslint-disable-next-line no-unused-vars
+    onSend: function (receiver, name, args, rubyBlockArgs, rubyBlock) {
+        let block;
+        console.log(arguments);
+        if ((this._isSelf(receiver) || receiver === Opal.nil) &&
+            name === 'when' &&
+            args.length >= 1 && args[0].type === 'sym' &&
+            rubyBlockArgs && rubyBlockArgs.length === 0 &&
+            rubyBlock) {
+            switch (args[0].value) {
+            }
+        } else if (this._isSelf(receiver) || receiver === Opal.nil) {
+            switch (name) {
+            case 'microbit':
+                if (args.length === 0) {
+                    block = this._createRubyExpressionBlock(MicroBit);
+                }
+                break;
+            }
+        } else if (this._equalRubyExpression(receiver, MicroBit)) {
+            switch (name) {
+            case 'button_pressed?':
+                if (args.length === 1 && this._isString(args[0])) {
+                    block = this._changeBlock(receiver, 'microbit_isButtonPressed', 'value_boolean');
+                    delete this._context.blocks[receiver.inputs.EXPRESSION.block];
+                    delete receiver.inputs.EXPRESSION;
+
+                    this._addFieldInput(
+                        block, 'BTN', 'microbit_menu_buttons', 'buttons',
+                        args[0], 'A'
+                    );
+                }
+                break;
+            }
+        }
+        return block;
+    }
 };
 
 export default MicroBitConverter;