Support the default value for wstring

Before this patch, when a field of type wstring had a default value,
an error happened.

This patch implements this function. A new dependency, console_bridge,
is add to the macOS platform.

Fix #500

Author: Minggang Wang

.circleci/config.yml

@@ -22,7 +22,7 @@ jobs:
     - run: brew install python
     - run: brew install wget cmake cppcheck tinyxml tinyxml2 eigen pcre poco
     - run: brew install openssl
-    - run: brew install asio
+    - run: brew install asio console_bridge
     - run: python3 -m pip install catkin_pkg empy git+https://github.com/lark-parser/[email protected] pyparsing pyyaml setuptools argcomplete colcon-common-extensions numpy
     - run: mkdir -p ~/ros2_install && cd ~/ros2_install && wget https://ci.ros2.org/view/packaging/job/packaging_osx/lastSuccessfulBuild/artifact/ws/ros2-package-osx-x86_64.tar.bz2 && tar xf ros2-package-osx-x86_64.tar.bz2
     - run: wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash

rosidl_gen/templates/message.dot

@@ -281,7 +281,7 @@ class {{=objectWrapper}} {
     {{? field.type.isPrimitiveType && !field.type.isArray}}
     {{? field.default_value === null}}
     this._{{=field.name}}Intialized = false;
-    {{?? field.type.type === 'string'}}
+    {{?? field.type.type === 'string' || field.type.type === 'wstring'}}
     this._refObject.{{=field.name}} = "{{=field.default_value.replace(/"/g, '\\"')}}";
     this._{{=field.name}}Intialized = true;
     {{??}}