EV3のwhenDistanceLessThanを追加

Author: Tomoya0302

src/lib/ruby-generator/ev3.js

@@ -48,5 +48,11 @@ export default function (Generator) {
         return `ev3_motor_position(${port})\n`;
     };
 
+    Generator.ev3_whenDistanceLessThan = function (block) {
+        block.isStatement = true;
+        const distance = Generator.valueToCode(block, 'DISTANCE', Generator.ORDER_NONE) || null;
+        return `${Generator.spriteName()}.when(:ev3_distance_<, ${distance}) do\n`;
+    };
+
     return Generator;
 }