126 lines
4.3 KiB
Markdown
126 lines
4.3 KiB
Markdown
---
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layout: page
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published: true
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noToc: false
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noComments: false
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noDate: false
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title: Fun — Feature Overview
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subtitle: A high-level list of language, VM/runtime, tooling, and ecosystem features in Fun.
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description: Comprehensive feature list of the Fun programming language, its VM/runtime, tooling, build options, and optional extensions.
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permalink: /features/
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lang: en
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tags:
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- features
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- overview
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- language
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- vm
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- runtime
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- stdlib
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- tooling
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- build
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- portability
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- extensions
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- web
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- cgi
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---
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This page summarizes the core capabilities of Fun: the language, its virtual machine/runtime, tooling, build options, and the surrounding ecosystem. For in‑depth pages, see also:
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- VM opcodes overview: /documentation/opcodes/
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- Optional extensions catalog: /documentation/extensions/
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## Language
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- Simple, expressive syntax designed for scripting and embedding
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- First‑class functions and function calls
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- Variables, locals and globals with stack‑based execution model
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- Control flow: conditional jumps, returns, and basic boolean operators
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- Arrays and maps as primary collection types (literal construction, indexing, slicing, membership)
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- Strings with common operations (substring, find, split, join)
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- Arithmetic and bitwise integer operations (add, sub, mul, div, mod; band, bor, bxor, shifts, rotations)
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- Exceptions and error handling primitives (throw/try semantics at VM level)
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- Regular expressions support via optional PCRE2 extension (see Extensions)
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Notes:
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- See the opcode index for the precise stack behavior of each operation: /documentation/opcodes/
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## Virtual Machine & Runtime
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- Compact stack‑based bytecode VM implemented in C (C99)
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- Deterministic execution model with explicit opcodes for core language features
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- Efficient array and map primitives with indexing and mutation opcodes
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- Built‑in string operations and regex integration (with extension)
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- Minimal error model integrated with VM (throw/try handlers)
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## Standard Library (Core)
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Core functionality available out of the box in the VM and library modules:
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- Arrays: create, push/pop, insert/remove, slice, contains, join, enumerate
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- Maps: create, has_key, keys, values
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- Strings: substr, find, split, replace (with regex), join
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- Math and bitwise ops over fixed‑width integers used by the VM
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See the opcode list for the canonical reference: /documentation/opcodes/
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## Tooling
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- Fun interpreter/runtime executable (target: fun)
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- REPL and small tools (targets: repl, funstx, examples under examples/)
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- Test binaries (target: fun_test, test_opcodes)
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- Formatting helper target (target: format) using clang‑format
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- Make‑like aggregate build target (target: build)
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## Build System & Options
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Fun uses CMake and exposes toggles that mirror the project’s optionality at build time:
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- FUN_DEBUG — enable extra diagnostics in builds
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- FUN_USE_MUSL — build against musl when available
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- FUN_WITH_CPP — enable C++ interop/components where applicable
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- FUN_WITH_RUST — build and link an optional Rust static library with opcode examples
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- FUN_BUILD_DOCS — generate documentation (Doxygen/website pipelines)
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- FUN_WITH_* — per‑extension toggles (see Extensions section)
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Targets available for CI/workflows include Experimental/Continuous/Nightly aggregates, plus unit tests and coverage helpers (see CMake targets).
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## Portability
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- Written in portable C99
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- Designed to build on common Linux environments; musl support available
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## Extensions (Optional, Build‑time)
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Fun ships with optional integrations that can be enabled per environment. Highlights include:
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- cURL (HTTP client)
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- INI (iniparser)
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- JSON (json‑c)
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- libxml2 (XML)
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- SQLite
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- PCRE2 (Perl‑compatible regex)
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- PC/SC (Smart cards)
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- OpenSSL (crypto/TLS)
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- kcgi (CGI/web helper)
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See the full catalog with enable/requirement notes: /documentation/extensions/
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## Web/CGI
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- Optional kcgi integration for building CGI‑style programs and simple web endpoints (see Extensions)
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- Website sources under web/ with Jekyll layouts; generated site in web/_site/
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## Testing
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- Unit and VM‑level opcode tests (targets: fun_test, test_opcodes)
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- Example scripts under examples/ exercised by CI and manual runs
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## Documentation
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- Doxygen configuration for API references (Doxyfile)
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- Human‑readable docs under web/documentation/ (opcodes, extensions, etc.)
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## Licensing
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- Licensed under an OSI‑approved license; see LICENSE at the repository root
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