Skip to content

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

Entry points

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

What to read first

  • examples/arithmetics/src/arithmetics/core/ArithmeticParser.hpp for the grammar and rule definitions
  • examples/arithmetics/src/arithmetics/core/ast.hpp for the AST shape
  • examples/arithmetics/src/arithmetics/core/CoreModule.cpp for service wiring
  • examples/arithmetics/src/arithmetics/core/Language.cpp for evaluating the parsed AST
  • examples/arithmetics/src/arithmetics/core/validation/ArithmeticsValidator.cpp for semantic checks
  • examples/arithmetics/src/arithmetics/lsp/ArithmeticsFormatter.cpp for formatter rules

Use this example when

  • your language is expression-heavy
  • you need precedence and associativity
  • you want to study InfixRule (precedence-climbing infix expressions)
  • you want the smallest full formatter example