Code Formatter

Purpose & User Intent: A language-aware code formatter that reformats source code across multiple languages to enforce a consistent style, reduce diffs, and improve readability. Target users are developers, code reviewers, and CI engineers who work on shared codebases and need deterministic formatting before commits or pull requests. When there is a requirement to standardize spacing, indentation, quotes, or line length across a project, this tool formats the input accordingly.
Core Logic & Features: Core capability is language-aware parsing and AST-based reprinting. Required features include: language input (explicit or inferred), robust AST construction, preservation of comments and string literals, and configurable formatting (indentation, line length, trailing commas, quote style, semicolon usage). Optional/advanced features include: multiple style presets (e.g., Google, PEP8-like for Python, Spring/Google for Java), custom user configs, minification for supported languages, in/out-of-place formatting, and optional diff output. Outputs include formatted_code and optional diagnostics.
Algorithms & Calculations: The tool parses code into language-specific ASTs, applies formatting rules, and prints back to code while preserving semantics. It enforces line endings and spacing, caps line lengths where feasible, and honors user preferences. If parsing fails for the given language, it may fall back to a safe reformat or return diagnostics without changing semantics.
Error & Edge Cases: Missing required inputs results in errors; unsupported languages raise clear diagnostics; extremely large inputs are chunked; syntax errors are handled gracefully with minimal changes; external data should not be fetched. Industry/Region & Localization: Supports LF/CRLF line endings and locale-appropriate handling of identifiers where applicable; no region-specific code is altered unless part of the language syntax. Assumptions & Exclusions: Assumes input is code in a supported language intended for formatting only; does not lint, compile, or execute code; not a code editor and provides no UI behavior.