@foxglove/rosmsg
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5.0.4 • Public • Published

@foxglove/rosmsg

ROS1 and ROS2 message definition parser

npm version

Introduction

The Robot Operating System (ROS) defines a simplified message description language for describing data types. This library parses those message definitions and can round trip them back into a canonical string format suitable for checksum generation. The parsed definitions are useful for serialization or deserialization when paired with other libraries.

This library supports both ROS1 and ROS 2 message definitions.

ROS 1 Definition Usage

import { parse, stringify } from "@foxglove/rosmsg";

const definitionStr = `# geometry_msgs/Pose
geometry_msgs/Point position
geometry_msgs/Quaternion orientation

===
MSG: geometry_msgs/Point
float64 x
float64 y
float64 z

===
MSG: geometry_msgs/Quaternion
float64 x
float64 y
float64 z
float64 w`;

const messageDefinition = parse(definitionStr);

// print the parsed message definition structure
console.log(JSON.stringify(messageDefinition, null, 2));

Prints:

[
  {
    "definitions": [
      {
        "type": "geometry_msgs/Point",
        "isArray": false,
        "name": "position",
        "isComplex": true
      },
      {
        "type": "geometry_msgs/Quaternion",
        "isArray": false,
        "name": "orientation",
        "isComplex": true
      }
    ]
  },
  {
    "name": "geometry_msgs/Point",
    "definitions": [
      {
        "type": "float64",
        "isArray": false,
        "name": "x",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "y",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "z",
        "isComplex": false
      }
    ]
  },
  {
    "name": "geometry_msgs/Quaternion",
    "definitions": [
      {
        "type": "float64",
        "isArray": false,
        "name": "x",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "y",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "z",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "w",
        "isComplex": false
      }
    ]
  }
]

ROS 2 Definition Usage

import { parse, stringify } from "@foxglove/rosmsg";

const definitionStr = `# geometry_msgs/msg/Pose
geometry_msgs/msg/Point position
geometry_msgs/msg/Quaternion orientation

===
MSG: geometry_msgs/msg/Point
float64 x
float64 y
float64 z

===
MSG: geometry_msgs/msg/Quaternion
float64 x
float64 y
float64 z
float64 w`;

const messageDefinition = parse(definitionStr, {ros2: true});

// stringify(messageDefinition) will return a canonical string, similar to
// _definitionStr_
// print the parsed message definition structure
console.log(JSON.stringify(messageDefinition, null, 2));

Prints:

[
  {
    "definitions": [
      {
        "type": "geometry_msgs/msg/Point",
        "isArray": false,
        "name": "position",
        "isComplex": true
      },
      {
        "type": "geometry_msgs/msg/Quaternion",
        "isArray": false,
        "name": "orientation",
        "isComplex": true
      }
    ]
  },
  {
    "name": "geometry_msgs/msg/Point",
    "definitions": [
      {
        "type": "float64",
        "isArray": false,
        "name": "x",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "y",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "z",
        "isComplex": false
      }
    ]
  },
  {
    "name": "geometry_msgs/msg/Quaternion",
    "definitions": [
      {
        "type": "float64",
        "isArray": false,
        "name": "x",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "y",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "z",
        "isComplex": false
      },
      {
        "type": "float64",
        "isArray": false,
        "name": "w",
        "isComplex": false
      }
    ]
  }
]

ROS 2 IDL Support

See (@foxglove/ros2idl-parser)[https://github.com/foxglove/omgidl/packages/ros2idl-parser] for our implementation of ros2idl schema support.

License

@foxglove/rosmsg is licensed under the MIT License.

Releasing

  1. Run yarn version --[major|minor|patch] to bump version
  2. Run git push && git push --tags to push new tag
  3. GitHub Actions will take care of the rest

Stay in touch

Join our Slack channel to ask questions, share feedback, and stay up to date on what our team is working on.

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