Arithmetics

Source: examples/arithmetics

arithmetics is the smallest example that still shows the full Pegium loop: parser, language services, validation, formatting, CLI, LSP server, and VS Code client.

What it shows

• a parser for .calc
• a small evaluator
• a formatter
• a stdio LSP server
• a VS Code client

Useful entry points

• CLI: ./build/examples/arithmetics/pegium-example-arithmetics-cli
• LSP: ./build/examples/arithmetics/pegium-example-arithmetics-lsp

What to read first

If you want to understand the example quickly, start with:

• examples/arithmetics/src/ArithmeticsModule.cpp for service wiring
• examples/arithmetics/src/Language.cpp for the grammar and AST shaping
• examples/arithmetics/src/validation/ArithmeticsValidator.cpp for semantic checks
• examples/arithmetics/src/lsp/ArithmeticsFormatter.cpp for formatter rules

Why start here

This is the smallest example that still exercises parsing, services, validation, formatting, and the editor integration path.

Use this example when

• your language is expression-heavy
• you need precedence and associativity
• you want to study Infix rules
• you want the smallest full formatter example

Continue with

• Write the Grammar
• Dependency Loops
• Formatting