An LSP infrastructure to build EMF language servers for Web-deployable model editors

Oct 15, 20180 likes265 views

The document discusses an LSP (Language Server Protocol) infrastructure designed for building EMF language servers that enable web-deployable graphical model editors. It highlights the complexity of developing these editors and the necessity of reusing model-driven engineering technologies to enhance their functionality. The authors argue that despite LSP's initial focus on textual languages, it can effectively support graphical languages through a set of core functionalities and propose future work for performance optimization and server enhancements.

Software

An LSP infrastructure to build EMF language
servers for Web-deployable model editors
Roberto Rodriguez-Echeverria, Javier L. Cánovas, Manuel Wimmer and Jordi Cabot
MDETools 2018

Context
Increasing interest to move model editing support to Web tools
The development of graphical modeling editors is complex and challenging
=> Reusing MDE technologies (modeling frameworks) is mandatory

Motivation
Editor & Views
Semantic Operations
Diagramatic
Operations
Auxiliary Operations
Graphical modeling editor
Validation
Type-based selection
Completion
...
Align
Free selection
Group
... Storage
...

Motivation
Editor & Views
Diagramatic
Operations
Graphical modeling client
Modeling framework
(platform specific)
Semantic Operations
Diagramatic
Operations
Auxiliary Operations
Graphical language server
Web platform

Problem
Editor & Views
Diagramatic
Operations
Graphical modeling client
Modeling framework
(platform specific)
Semantic Operations
Diagramatic
Operations
Auxiliary Operations
Graphical language server
Web platform
?

LSP
Language Server Protocol
IDE Language servers
MxN problem (3x9) to M+N problem (3+9)
https://langserver.org/

Language Server Protocol
https://microsoft.github.io/language-server-protocol/overview

Language Server Protocol
Main issue
● designed for textual programming languages and not for graphical ones,
LSP basic types are (ids):
● document URI
● text range:
○ line number and character position
=> making easy for clients to connect to different LS in a seamless way, because
the protocol is completely language-agnostic

LSP infrastructure for graphical languages

Graphical Language Server
Fundamental stack of functionalities:
1. management and validation of abstract model instances;
2. management and validation of concrete model instances;
3. provision of language descriptions (stencil palette & compositional rules);
4. diagrammatic operations, e.g., autolayout by means of ELK;
5. auxiliary operations, e.g., serialization support.

Distributable generic client
Web technologies
Parametrized by language descriptions
● Symbols (stencils palette)
● Compositional rules
<svg><g id=”Family” class="rotatable">
<g class="scalable">
<rect y="0" x="0" height="10" width="20"
style="..."/>
</g>
<text id="name" y="20" x="5" style="...">
</text>
<text id="firstName" y="40" x="25"
style="...">
</text>
</g></svg>

LSP mapping for model editing operations
More information on this: Friday 19 Oct 2018

Conclusions
LSP-based infrastructure for Graphical Language Servers
Reuse first approach to get affordable implementations
● reuse model-driven technologies and frameworks
● reuse LSP implementations
Is LSP the right choice?
● despite its text-based design, most of the messages defined in LSP are
common for both textual and graphical languages.
● LSP expressiveness seems enough for graphical editors, so far

Future work
Roadmap:
● Automatic generation of graphical language servers
○ To what extent is feasible?
● Performance assessment
○ bandwidth optimization and server-side enhancements.
● IRF evolution
○ Is a node-edge notation enough for not graph-like languages (UML sequence diagrams)?

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