stylus/stylus

Features

• CSS Preprocessors - Transforms a flexible, indentation-based preprocessor language into standard CSS.
• Preprocessing Variables - Implements a robust system for storing reusable values in variables and interpolating them into CSS declarations.
• CSS Preprocessing Workflows - Implements a complete workflow for transforming a dynamic preprocessor language into standard CSS.
• CSS Preprocessors - Transforms a dynamic preprocessor language into standard CSS via a standalone command-line executable.
• Color Manipulation - Provides utilities to get or set specific color channels including red, green, blue, alpha, and hue.
• Sequence Generators - Creates lists of values between two points using inclusive or exclusive range operators.
• Key-Value Pair Managers - Provides utilities for storing and retrieving named values using hashes to organize configurations and constants.
• Hash Iterators - Allows looping over key-value pairs to dynamically generate CSS rules based on defined data.
• Index-Based Extraction - Implements zero-based indexing to retrieve specific elements from expressions or tuples.
• Stylesheet Compilation - Transforms a dynamic preprocessor language featuring nesting, variables, and arithmetic into standard CSS.
• AST Rendering Engines - Transforms a custom syntax tree into standard CSS using a recursive rendering engine.
• Stylesheet Function Definitions - Creates reusable logic blocks that accept arguments and return values for use within stylesheets.
• External Configuration Integration - Extends compiler capabilities by loading external modules and passing configuration arguments to them.
• Style Mixins - Provides reusable mixins to define sets of styles and logic that can be injected into multiple selectors.
• Compiler Logic Extensions - Adds custom JavaScript functions to perform complex logic not possible within the native preprocessor syntax.
• Compilation Math Operations - Includes built-in support for trigonometric values, rounding, and base conversion during stylesheet compilation.
• Compile-Time Expression Evaluation - Computes mathematical, logical, and color values during the compilation phase using a custom evaluator.
• Whitespace-Based Block Scoping - Utilizes significant whitespace and indentation to determine block nesting and scope instead of curly braces.
• List Manipulation Utilities - Offers primitives for adding, removing, and retrieving elements from lists using index and slice operations.
• String Manipulation - Provides comprehensive string manipulation including searching, replacing, splitting, and slicing with regular expressions.
• Stylesheet Imports - Includes style definitions and configurations from external files to share logic across multiple documents.
• Logical Operation Evaluation - Evaluates boolean logical operators during the compilation phase to determine if styles are included.
• Variable Assignments - Assigns expressions or lists to identifiers to ensure consistent styling across a stylesheet.
• Extensible Plugin Architectures - Exposes a renderer instance to external functions to automate the definition of settings and paths via a plugin system.
• Recursive AST Renderers - Transforms custom syntax trees into standard CSS using a recursive engine to resolve styles.
• Color Format Normalizers - Casts colors between different representations such as RGBA and HSLA.
• Outer Selector Referencing - Supports referencing the parent selector within nested rules to create pseudo-selectors and state modifiers.
• Selector Nesting - Implements hierarchical selector nesting to generate nested CSS rules and resolve parent references.
• Expression Iterators - Provides the ability to loop through lists and ranges to programmatically generate repetitive CSS rules.
• Programmatic Style Generators - Programmatically generates CSS rules and values using variables, loops, and mathematical operations during compilation.
• Code Transformation APIs - Provides APIs to render custom syntax strings into standard CSS using specific configuration options.
• CSS Parsing - Processes stylesheets using standard CSS syntax, allowing existing CSS files to be used within the preprocessor.
• Compilation Error Reporting - Identifies syntax and evaluation failures by providing stack traces, line numbers, and filenames during compilation.
• Dynamic Variable Interpolations - Looks up and defines variables using string names to allow dynamic interpolation.
• Compiler Context Inspection - Enables retrieval of the current compiled selector, active media rule, and function call stack for logic purposes.
• Node.js Build Tools - Provides CLI tools and middleware for integrating the CSS compiler into Node.js-based development environments.
• Source Map Generators - Generates source maps that link the final CSS output back to the original preprocessor source for easier debugging.
• Source File Watching - Monitors source files for changes and automatically regenerates output CSS in real time.
• Frontend Asset Pipelines - Integrates into frontend pipelines to compile source files into optimized CSS with source maps and vendor prefixing.
• Code Block Interpolations - Allows assigning chunks of styles or logic to variables for reuse via interpolation.
• Block Expression Evaluations - Evaluates expressions at compile time to determine whether specific blocks of styles or properties are included in the output.
• Logic Block Passing - Allows entire blocks of CSS rules to be passed into mixins for contextual rendering.
• Unit Casting - Allows forcing a specific unit suffix onto an expression as a shorthand for conversion.
• Color Value Transformations - Includes built-in functions to lighten, darken, desaturate, or invert colors.
• Global Variable Injections - Defines global variables that remain accessible throughout the entire stylesheet evaluation process.
• Compiler Extension Pipelines - Extends the compiler via a JavaScript-driven pipeline that allows external functions to manipulate rendering.
• At-Rule Implementations - Renders standard and future CSS at-rules using a braceless, indentation-based syntax.
• Color Blending - Provides utilities for mixing and blending multiple colors using ratios and contrast calculations.
• Color Rendering Adjustments - Enables adjustment of RGB, HSL, and alpha channels to shift and modify color output.
• CSS Minification - Reduces the size of generated stylesheets by removing unnecessary whitespace and characters.
• CSS Reverse Compilers - Converts standard CSS files back into terse preprocessor syntax.
• Nested Selector Escaping - Allows starting a selector at the root level to define styles outside the current nesting scope.
• Selector Interpolation - Inserts the results of dynamic expressions directly into property names or CSS selectors.
• Extendable Placeholders - Defines hidden selectors that are only rendered in the final CSS when extended by other rules.
• CSS Animations - Facilitates the definition of keyframe rules using flexible syntax and interpolation for visual transitions.
• Viewport-Based Definitions - Utilizes block notation and nested queries to define styles that adapt to different viewport dimensions.
• Selector Style Inheritance - Enables sharing properties between rulesets to simplify the maintenance of semantic styles.
• Nested Imports - Places imported styles inside specific CSS selectors to restrict their application to a subset of elements.
• CSS Media Queries - Injects variables and expressions into media query definitions to programmatically calculate breakpoints.
• Vendor Prefix Managers - Expands animation rules into multiple vendor-specific versions to ensure cross-browser compatibility.

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