Elm bindings for Morphir
npm install morphir-elmMorphir is a multi-language system built on a data format that captures an
application's domain model and business logic in a technology agnostic manner. This repo contains tools that
allow you to write your business logic in Elm, parse it into Morphir IR and transpile
it to other languages like Scala or visualize it to your business users using Elm.
We publish it both as an NPM and an Elm package:
- The NPM package contains the CLI for running the tools as part of your build.
- The Elm package supports multiple use-cases:
- It includes SDK functions that you can use while writing your business logic beyond the default elm/core support.
- It provides a type-safe API to work with the Morphir IR directly. You can use this to add your own logic builder,
visualization or language transpiler.
- It also provides access to the frontend that parses the Elm source code and returns Morphir IR. You could use this
to embed a business logic editor in your web UI.
The morphir-elm NPM package provides a CLI to run the tooling.
``
npm install -g morphir-elm
All the features can be accessed through sub-commands within the morphir-elm command:
`
Usage: morphir-elm -f [options] [command]
Options:
-v, --version output the version number
-h, --help output usage information
Commands:
make Translate Elm sources to Morphir IR
gen Generate code from Morphir IR
develop Start up a web server and expose developer tools through a web UI
help [cmd] display help for [cmd]
`
Each command has different options which are detailed below:
This command reads Elm sources, translates to Morphir IR and outputs the IR into JSON.
`
Usage: morphir-elm make [options]
Translate Elm sources to Morphir IR
Options:
-p, --project-dir
-o, --output
-h, --help output usage information
-f, --fallback-cli Use old cli make function - recommended (default: false)
`
Important: The command requires a configuration file called morphir.json located in the project
root directory with the following structure:
`
{
"name": "My.Package",
"sourceDirectory": "src",
"dependencies" : ["a", "b"]
"localDependencies" : ["a", "b"]
"exposedModules": [
"Foo",
"Bar"
]
}
- name - The name of the package. The package name should be a valid Elm module name and it should be used as a
module prefix in your Elm models. If your package name is My.Package all your module files should either be directlyfile://
under that or in submodules.
- sourceDirectory - The directory where your Elm sources are located.
- dependencies - List of URI references to other IR files. Supports
|http://|https://|data:// protocols.
* localDependencies - List of relative paths to depending IRs. (for backwards compatibility), ex: "../sibling-folder/morphir-ir.json"
- exposedModules - The list of modules in the public interface of the package. Module names should exclude the
common package prefix. In the above example Foo refers to the Elm module My.Package.Foo.
#### Examples
If you want to try the make command you can use the reference model we have under tests-integration/reference-model. Simply cd into the directory and run the command.
This command reads the JSON produced by morphir-elm make and generates code into the specified folder:
`
Usage: morphir-elm gen [options]
Generate code from Morphir IR
Options:
-i, --input
-o, --output
-t, --target
-e, --target-version
-c, --copy-deps Copy the dependencies used by the generated code to the output path. (default: false)
-h, --help output usage information
`
#### Examples
If you want to try the gen command you can use the reference model we have under tests-integration/reference-model. Simply cd into the directory and run the command.
This command relies on the JSON produced by morphir-elm make and brings up a web server to browse the Morphir IR.
`
Usage: morphir-elm develop [options]
Start up a web server and expose developer tools through a web UI
Options:
-p, --project-dir
-h, --help output usage information
`
#### Examples
If you want to try the develop server you can use the reference model we have under tests-integration/reference-model. Simply cd into the directory and run the command.
This command starts a Model Context Protocol (MCP) server that provides tools for interacting with Morphir projects through AI assistants and other MCP-compatible clients.
`
Usage: morphir mcp [options]
Start a Model Context Protocol server for Morphir project interaction
Options:
--elm-command
--root-dir
-h, --help output usage information
`
The MCP server provides the following tools:
- addModule: Adds a new module to the Morphir project with Elm code
- setTestCases: Sets test cases for functions in the Morphir project
The server automatically creates morphir.json and elm.json configuration files if they don't exist, making it easy to start a new Morphir project from scratch.
#### Examples
Start the MCP server for a project in the current directory:
`bash`
morphir mcp --root-dir .
Start the MCP server with a custom Elm command:
`bash`
morphir mcp --root-dir ./my-project --elm-command /path/to/elm
Note: The MCP server is designed to be used with AI assistants and other MCP-compatible clients. It uses stdin/stdout for communication according to the MCP protocol specification.
The finos/morphir-elm package
provides various tools to work with Morphir. It contains the following main components:
- The Morphir SDK which provides the base set of types and functions that Morphir tools support
out-of-the-box. (the SDK is a superset elm/core with a few
exceptions documented below)
- A type-safe API for the Morphir IR that allows you to create or inspect it.
`
elm install finos/morphir-elm
The goal of the Morphir.SDK module is to provide you the basic building blocks to build your domain model and
business logic. It also serves as a specification for backend developers that describes the minimum set of functionality
each backend implementation should support.
It is generally based on elm/core/1.0.5 and provides most of
the functionality provided there except for some modules that fall outside the scope of business knowledge modeling:
Debug, Platform, Process and Task.
Apart from the modules mentioned above you can use everything that's available in elm/core/1.0.5 without importingMorphir SDK
the . The Elm frontend will simply map those to the corresponding type/function names in the Morphir SDK.
The Morphir SDK also provides some features beyond elm/core/1.0.5. To use those features you have to import theMorphir SDK
specific module.
The Morphir.IR module defines a type-safe API to work with Morphir's intermediate representation. The module
structure follows the structure of the IR. Here's a list of concepts in a top-down approach:
- Distribution is the output
of morphir-elm make. It represents a whole package with all of its dependencies.
- Package represents a set of
modules that are versioned together.
- Module is a container
to group types and values.
- Types allow you to describe
your domain model.
- Values allows you to
describe your business logic.
- Names provide a naming
convention agnostic representation for all nodes that can be named: types, values, modules and packages. Names can be
composed into hierarchies:
- path is a list of names
- qualifield name is a module path with a local name
- fully-qualifield name is a package path with a qualified name
- AccessControlled
is a utility to define visibility constraints for modules, types and values
1. Fork it (
2. Create your feature branch (git checkout -b feature/fooBar)git commit -am 'Add some fooBar'
3. Read our contribution guidelines and Community Code of Conduct
4. Commit your changes ()git push origin feature/fooBar`)
5. Push to the branch (
6. Create a new Pull Request
_NOTE:_ Commits and pull requests to FINOS repositories will only be accepted from those contributors with an active, executed Individual Contributor License Agreement (ICLA) with FINOS OR who are covered under an existing and active Corporate Contribution License Agreement (CCLA) executed with FINOS. Commits from individuals not covered under an ICLA or CCLA will be flagged and blocked by the FINOS Clabot tool. Please note that some CCLAs require individuals/employees to be explicitly named on the CCLA.
_Need an ICLA? Unsure if you are covered under an existing CCLA? Email help@finos.org_
Steps for publishing a new release
Copyright 2014 Morgan Stanley
Distributed under the Apache License, Version 2.0.
SPDX-License-Identifier: Apache-2.0