@kaluchi/qlang

Expression language for transforming immutable values through pipelines. Domain-agnostic. Pure. Composable.

> [1 2 3 4 5] | filter(gt(3)) | count
2

> let(:double, mul(2)) | [10 20 30] * double
[20 40 60]

> let(:@surround, [:pfx, :sfx], prepend(pfx) | append(sfx))
  | "world" | @surround("[", "]")
"[world]"

|~| code-as-data ring — source → AST-Map → pipeValue
> "10 | add(3)" | parse | eval
13

|~| bare operand → its descriptor as data
> mul | /category
:arith

Documentation

| File | Audience | Answers | |---|---|---| | qlang-spec.md | query authors | Values, pipeline operators, conduits, scoping, grammar | | qlang-operands.md | query authors | Full catalog of built-in operands with signatures and examples | | qlang-internals.md | evaluator / embedder implementors | Formal (pipeValue, env) model, AST traversal, session lifecycle, codec |

Dependency: spec is self-contained for writing queries. operands is the reference lookup alongside spec. internals assumes familiarity with spec and is needed only for building evaluators or embedding qlang.

Running

npm install
npm test
npm run test:coverage

Coverage thresholds: lines = 100%, functions = 100%, branches = 100%.