PatLang

PatLang programming language, self-hosted compiler, and interactive portfolio.

PatLang All Paradigms Demo

Recursion, control flow, lists, events (when/emit), logic (fact/query), OO (new/send/get), and functional map/filter via apply .

PatLang Self-Timing Benchmark

fib(27), a 2-million iteration loop, and a 200k-element vector build, each reporting its own elapsed milliseconds.

The self-hosted PatLang compiler (lexer, parser, lowerer) compiled to WebAssembly. Edit the program, press Run: your source is tokenized, parsed, and lowered by PatLang code running in this page, then executed on the…

PatLang Point of Sale Demo

A checkout session as a stream of scan / pay events: the product catalog lives in the object store, and a dairy fact drives the discount rule.

PatLang BDD Framework

PatLang's own self-hosted Gherkin-style BDD framework ( lib/test.patlang : t_init / check / step / run_feature_tagged ), running against the point of sale: unit assertions, event-driven integration checks, and a Gherkin…

PatLang Design by Contract

require checks a precondition, ensure a postcondition, and assert is the same primitive used standalone — all three lower to one contract_check host call, enforced identically whether interpreted, run here via WASM (no…

PatLang Numeric Tower

Ordinary Int arithmetic stays on the fast path until it can't: factorial(30) overflows a 64-bit integer partway through and the runtime silently promotes to an exact, arbitrary-precision BigInt — no annotation, no…

PatLang Router DSL

A small grammar extension declared entirely in PatLang source ( syntax RouterDSL { trigger; tokens { ... }; rule { ... } } ), matching HTTP-verb/URL-path tokens with a general-purpose regex engine also written in…

PatLang Dynamic Syntax

The DSL page above declares its syntax { ... } block as a literal, expanded once before the compiler ever runs — indistinguishable from a macro. This one instead computes its trigger keyword and rules from data at…

PatLang Project Report Writer

Writing the abstract requires every other section to exist first, and several sections have real sub-tasks of their own (running experiments, gathering data, and analysing it are separate delegated tasks). Each task is…

PatLang Patbuild

Driven by a manifest file ( self_hosting/patbuild.manifest ):

PatLang Flow Graph Generator

The same control-flow-graph recovery as the flowgraph CLI tool ( flowgraph <output.html> [inputs...] , source below), running live: paste a program, press Render, and see basic blocks and jump edges recovered from the…

PatLang Browser GUI Generator

PatLang computing data (a fibonacci table) and generating a well-formed, interactive HTML+JS page around it — the browser as PatLang's cross-platform GUI. Running live below: the iframe is the actual page this PatLang…

PatLang Compiler Self-Metrics

The self-hosted compiler front+middle end processing its own complete source (289918 chars), run under the Stage 0 interpreter while building this page:

PatLang Ruby Transpilation

A self-hosted Ruby transpiler ( lib/transpile_ruby.patlang ) walking the PRE-LOWERING AST directly (real if / while / def already present, unlike the flattened jump-based IR the ordinary compiler produces) to emit…

PatLang Maze

A grid compiled into logic-programming fact s, solved by a recursive depth-first search driven by query , announced with goal , and reported through a solved / unsolved event - generation and solving both run live in…

PatLang IDE

The self-hosted compiler (lexer, parser, lowerer), compiled to WebAssembly once and reused for every run in this page. Run executes your program; Tokens and AST show the compiler's own intermediate representations for…

PatLang Flow Graphs

Basic blocks and jump edges recovered from the self-hosted compiler's own IR, one section per program. Red curves are conditional (JumpIfFalse), blue are unconditional.

PatLang Real OS Threads

parallel_map(items, "func_name") spawns one real OS thread per item (via Rust's std::thread::scope ) and runs func_name(item) on each concurrently — genuine parallelism, mirrored byte-for-byte into the compiled-native…

PatLang Fibers

Ruby-style cooperative coroutines ( fiber_new / fiber_resume / fiber_yield / fiber_alive ), implemented on real OS threads under the hood but never actually running concurrently: a mutex+condvar pair ( ir/fiber.rs )…