Open-source alternatives to Swift Format

actionlint is a static analysis tool and linter specifically designed for GitHub Actions workflow files. It functions as a CI workflow validator and YAML configuration linter to ensure the syntax and logic of automation files are correct before deployment. The project distinguishes itself by performing deep security auditing and script analysis. It includes a shell script auditor to detect syntax bugs and script injection vulnerabilities in inline commands, and it scans for hardcoded credentials to prevent security leaks. The tool covers a broad range of validation capabilities, including ex

Vim-codefmt is a plugin for the Vim text editor that automates source code formatting by integrating external command-line utilities. It functions as a bridge between the editor and specialized formatting tools, allowing developers to maintain consistent style across diverse programming languages through a unified interface. The plugin operates by invoking external processes to transform buffer content, utilizing standard input and output streams to exchange data. It supports both full-file formatting and targeted adjustments for specific code ranges, ensuring that style enforcement can be ap

gofumpt is a Go language tool and source code formatter. It functions as an opinionated code styler that applies a strict and consistent visual style to Go source files to ensure a standardized appearance across a codebase. The tool enforces a more rigid and deterministic set of layout constraints than the standard Go toolchain. It is designed for Go project style enforcement to eliminate trivial diffs and stylistic inconsistencies. The project supports Go source code formatting and continuous integration linting to automatically check and correct formatting during the build process.

rustfmt is a Rust code formatter that operates as a Cargo subcommand, applying consistent formatting to Rust source files according to official style guidelines. It parses source code into a syntax tree, applies formatting rules to tree nodes, and pretty-prints the result back to text, with support for TOML-driven configuration that allows per-project style customization. The formatter is edition-aware, automatically selecting formatting rules based on the Rust edition specified in the project, and supports a style edition override that decouples formatting rules from the Rust edition used fo

rustfmt is a tool that automatically rewrites Rust source code to adhere to a consistent and standardized style guide. It functions as both a code formatter for transforming source files and a style linter used to verify if code matches required formatting rules. The system is configurable, allowing for the definition of custom formatting rules and language editions through configuration files to override default styles. It also supports selective formatting by using dedicated skip markers to prevent specific blocks of code from being modified. The tool provides capabilities for both source

google-java-format is a Java code formatter and style enforcement tool. It reformats Java source code to adhere to a standardized style guide, ensuring consistent layout and indentation across entire projects or individual files. The project functions as a build pipeline linting tool for continuous integration workflows and as an IDE formatting plugin to replace native editor formatting. It can be embedded as a formatting library within code generation software to ensure machine-written output remains human-readable. The tool provides capabilities for reorganizing source code indentation and

syn is a Rust syntax tree parser and token stream converter. It serves as a toolkit for procedural macro development, providing a framework to parse Rust source code into structured syntax trees for analysis and transformation. The project enables the manipulation of Rust abstract syntax trees through specialized visitor and folder patterns for traversing and mutating nodes. It provides a bidirectional mapping that allows developers to convert token streams into structured trees and print those trees back into tokens for code generation. The library covers a broad range of syntax analysis ca

SwifterSwift is a collection of Swift extensions designed to reduce boilerplate code during the development of iOS and macOS applications. It provides a library of pre-made utilities that extend the standard library and system frameworks to streamline data manipulation, system integration, and user interface optimization. The project provides specialized tools for a wide range of development tasks. This includes image processing and binary translation, text string manipulation, and complex data management for arrays, strings, and dictionaries. It also offers utilities for network request mana

vim-lsp is a Vim plugin that implements the Language Server Protocol to provide an asynchronous code intelligence tool for the editor. It serves as a bridge between Vim and external language servers, providing semantic code analysis and IDE-like navigation and diagnostics. The project provides a refactoring interface for renaming symbols across a workspace and applying quick-fixes. It also enables semantic highlighting, which color-codes elements based on their meaning as determined by the language server. The plugin covers a broad surface of capabilities, including symbol navigation and dis

Esprima is a JavaScript parser that converts source code into a structured abstract syntax tree. It implements a specification-driven grammar to ensure compliance with ECMAScript standards, enabling the programmatic analysis and transformation of JavaScript programs. The project provides capabilities for lexical tokenization to break source code into individual symbols and static syntax validation to verify that scripts are well-formed without executing the code. Its functional surface covers JavaScript static analysis, lexical analysis, and the generation of abstract syntax trees.

Commonmark.js is a library designed to parse and render text formatted according to the CommonMark specification. It functions as a document processing pipeline that converts plain text into structured HTML or an abstract syntax tree, enabling developers to programmatically inspect, modify, and transform document elements. The library distinguishes itself through its strict adherence to standardized parsing rules, ensuring consistent and predictable output across different software environments. It provides a robust framework for document tree manipulation, allowing users to traverse, insert,

This project is an AI-powered code reviewer and static analysis server that identifies low-quality files and generates automated critiques. It functions as an automated quality scoring tool that evaluates source code structure and complexity through local parsing. The system utilizes a standardized context protocol to stream analysis results to AI agents and editors. It integrates large language models to produce automated reviews and suggestions for improvement based on quantitative quality metrics. The tool includes a weight-based scoring engine and an asynchronous analysis pipeline for pr

graphql-go is a schema-first GraphQL library and server implementation for Go. It provides a query execution engine and schema parser that converts schema definition strings into executable structures and validates resolver signatures. The library also includes a streaming implementation for real-time GraphQL subscriptions using channels within resolvers. The project distinguishes itself through parallel resolver execution to reduce request latency and the use of buffer-pool memory management to lower garbage collection overhead. It enables the creation of cloneable schema instances from a sh

Traceur is a JavaScript syntax transpiler that transforms modern and next-generation language features into compatible versions for older runtime environments. It functions as a compiler that translates proposed language standards and upcoming syntax into current versions to maintain cross-engine compatibility. The project operates as an asynchronous code transformer, converting async functions and generators into promise-based state machines. It includes a functional tail-call optimizer that wraps recursive functions in trampolines to prevent stack overflows and an ECMAScript polyfill engine

Utopia is a development platform for building React components through a visual interface that synchronizes changes directly with underlying source code. It functions as an AST-based code editor and a visual component editor, using abstract syntax tree manipulation to update files while preserving the original formatting and structure. The project features an in-browser module bundler that compiles and executes JavaScript modules directly within the browser to provide immediate feedback without server-side build steps. It also includes a pull request preview tool for inspecting and validating

This project is a set of git pre-commit hooks designed to automate the formatting, linting, and validation of Terraform configurations. It functions as an infrastructure as code linter, security scanner, cost estimator, and documentation generator to ensure code quality before commits are finalized. The tool distinguishes itself by providing specialized capabilities for infrastructure workflows, such as scanning templates for security vulnerabilities and hardcoded secrets, calculating projected cloud spending against budgets, and automatically extracting module definitions to populate readme

Dalfox is an automated web application security tool specifically designed for discovering and verifying cross-site scripting vulnerabilities. It functions as an XSS vulnerability scanner that analyzes HTTP parameters and DOM structures to identify reflected, stored, and blind injection points. The project distinguishes itself by providing a Model Context Protocol server and a REST API, allowing artificial intelligence agents and remote interfaces to trigger and manage security scans programmatically. It utilizes a payload mutation engine and fingerprinting strategies to execute WAF evasion t

Clean-CSS is a Node.js CSS optimizer that functions as a minifier, bundler, and post-processor. It is designed to decrease total stylesheet volume by removing whitespace, comments, and redundant code. The project provides a pipeline for applying custom transformations and browser compatibility adjustments. It allows for the programmatic modification of CSS rules and values through a plugin system and the use of custom optimization plugins. The tool covers a broad range of asset optimization capabilities, including stylesheet bundling, import rule inlining, and relative URL rebasing. It also

Asciidoctor is a Ruby-based text processing engine and command-line toolchain designed to convert AsciiDoc content into structured publishing formats, including HTML5 and DocBook 5. It functions as a static content publishing toolchain that transforms raw source files into formatted documents. The system utilizes a pluggable converter interface and template-driven output, allowing the default conversion logic to be overridden via custom converters or templates. This enables the generation of specific document structures and the export of content into various publishing formats for diverse dis

This project is a language extension for VS Code that provides comprehensive Go language support. It functions as a language server client, a debugger interface, and a toolchain manager to facilitate Go application development. The extension distinguishes itself by integrating a full suite of toolchain management capabilities, allowing for the installation and configuration of required binaries, linters, and compiler versions directly within the editor. It also provides deep integration for interactive debugging via Delve, supporting remote target debugging, process attachment, and program st

Mago is a PHP static analysis tool, linter, and code formatter. It detects type errors, dead code, and logic bugs through advanced type inference and flow analysis, while providing a deterministic engine to rewrite source files according to style guides. The project distinguishes itself with a WebAssembly runtime that enables PHP analysis to execute entirely within a web browser, allowing results to be shared via URL. It also provides a minimal Dockerized toolchain distributed as a scratch image for consistent execution across different processor architectures. The toolset covers architectur

This project is a CSS linter and static analysis tool designed to identify syntax errors, logic flaws, and problematic patterns in Cascading Stylesheets. It functions as a command line validator that verifies code quality and enforces consistent styling and coding standards without requiring a web browser. The analyzer distinguishes itself by incorporating web accessibility auditing to detect patterns that hinder users with disabilities. It also performs browser compatibility checking to identify non-standard hacks and missing vendor prefixes, and provides performance optimization analysis to

This project is a formal markdown specification standard that provides a detailed markup syntax definition and a definitive set of rules for parsing plain text into consistent HTML output. It establishes a standardized grammar for structural blocks and inline elements to ensure uniform rendering across different software implementations. The specification is supported by a parser conformance suite and a reference implementation in C and JavaScript to verify that implementations adhere to the standard. It includes a system for implementation verification that compares transformed input strings

CodeMirror is a browser-based code editor framework and modular extension system used to embed full-featured text editors into web pages. It functions as a syntax tree parsing engine and a language server protocol client, enabling structural language analysis and deep integration with external programming language services. The project is distinguished by its modular architecture, which uses a system of extensions and compartments for dynamic reconfiguration at runtime. It supports real-time collaborative editing and state synchronization through an operational transformation framework, allow

Expr is a high-performance expression evaluation engine and language for Go applications. It functions as a dynamic rule engine that parses and executes custom logic and data validations at runtime without requiring the application to be recompiled. The system utilizes a sandboxed logic executor to run expressions without side effects. It ensures program termination by employing instruction-level loop detection to prevent infinite loops and isolates the evaluation process from the host system. The engine employs a bytecode-based virtual machine and abstract syntax tree analysis to achieve ex

Pyre is a high-performance static type checker and analysis tool for Python. It identifies type errors and ensures type safety without executing the program, utilizing a static type inference engine to maintain consistency across functions. The project is distinguished by an incremental type analysis engine that operates as a background daemon. This system monitors filesystem changes to re-validate only modified parts of a project, reducing the time required for repeated analysis. It also includes a static analysis security tool that uses taint analysis to track untrusted data flows and ident

CodeQL is a semantic code analysis engine and vulnerability scanning tool that treats source code as data. It utilizes a static analysis query language to define complex patterns and security vulnerabilities within a code graph database. The system represents source code as a relational database, enabling the execution of structural queries and data flow analysis. This approach allows for the detection of security flaws and coding errors across large-scale repositories. The tool provides capabilities for automated code auditing, static analysis security testing, and custom vulnerability dete