@modelscript/lsp

Modelica Language Server Protocol implementation. Runs as a web worker in the browser, providing rich editor features for .mo files.

Features

• Semantic Token Highlighting — keywords, types, variables, strings, numbers, operators, comments
• Dot-Path Completions — sub-packages, classes, and components from the Modelica Standard Library
• Keyword Completions — all Modelica language keywords
• Hover Information — type, description, and classification for Modelica identifiers
• Error Diagnostics — parse errors via Tree-sitter and semantic errors via ModelicaLinter
• Document Formatting — proper indentation for class definitions, equations, algorithms, and control structures
• Color Provider — inline RGB color swatches for Modelica annotation color fields (color, lineColor, fillColor, textColor)
• Diagram Edits — computes text edits for component placement annotations during diagram interactions

Scripts

| Command | Description | | ----------------- | -------------------------- | | npm run build | Production webpack bundle | | npm run compile | Development webpack bundle | | npm run watch | Webpack watch mode |

Architecture

The server runs in a browser web worker via vscode-languageserver/browser. It communicates with the client extension (@modelscript/vscode) using BrowserMessageReader/BrowserMessageWriter.

The semantic token provider uses a Tree-sitter-based tokenizer matching the token legend — 10 token types (keyword, type, class, variable, parameter, function, string, number, operator, comment) and 2 modifiers (declaration, readonly).