PyIDF

Provides real-time syntax highlighting and language intelligence for PyIDF Python files within VS Code through a custom language definition and language server protocol (LSP) integration. The extension registers PyIDF as a distinct language mode, enabling semantic tokenization of PyIDF-specific constructs (formal specifications, constraint declarations, verification directives) alongside standard Python syntax, with server-side analysis for type checking and validation.

Delivers context-aware code completion for PyIDF constructs by maintaining a registry of formal specification keywords, proof tactics, and constraint declaration patterns. The completion engine analyzes the current cursor position within a PyIDF file, detects incomplete formal directives (e.g., @verify, @invariant, @lemma), and suggests completions with snippet templates that include placeholder parameters for formal properties, enabling developers to scaffold specifications without memorizing PyIDF syntax.

Runs real-time validation on PyIDF files by invoking the language server's diagnostic provider, which parses PyIDF syntax, type-checks formal specifications against the PyIDF type system, and validates constraint declarations for logical consistency. Diagnostics are reported as VS Code inline errors, warnings, and hints, with detailed messages explaining formal specification violations (e.g., 'invariant references undefined variable', 'proof tactic not applicable to goal type'), enabling developers to fix specification errors before runtime verification.

Implements VS Code's hover provider and definition navigation (go-to-definition, peek definition) for PyIDF constructs by maintaining a symbol table of PyIDF keywords, directives, and user-defined formal properties. When a developer hovers over a PyIDF directive (e.g., @invariant, @lemma) or references a formal property, the extension retrieves documentation from the bundled PyIDF schema or Imandra documentation, displaying inline tooltips with syntax, parameters, and usage examples. Definition navigation allows jumping to the declaration of user-defined lemmas, invariants, or proof strategies within the codebase.

Provides VS Code command palette actions and file templates to scaffold new PyIDF projects and files with boilerplate formal specification structure. When invoked, the extension generates a PyIDF file template with imports, formal property declarations (invariants, lemmas), and proof strategy stubs, optionally parameterized by user input (e.g., class name, property type). This reduces setup friction for developers starting formal verification workflows and ensures consistency with PyIDF conventions.

Integrates a PyIDF-aware code formatter that enforces consistent style for formal specifications, including indentation, spacing around formal directives (@invariant, @lemma), and alignment of constraint declarations. The formatter is invoked via VS Code's format-on-save or manual format command, parsing the PyIDF file and applying style rules defined in the extension or a project-level PyIDF configuration file. This ensures that formal specifications maintain readability and consistency across team codebases.