compiler: add then/2 and tap/2 support for functional pipelines#119
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compiler: add then/2 and tap/2 support for functional pipelines#119
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Add support for Elixir's then/2 and tap/2 functions in the compiler,
enabling functional pipeline patterns in WASM-compiled code:
- then/2: apply anonymous function to a value and return the result
Compiles to a let-binding in IR: value |> then(fn x -> x * 2 end)
becomes {:block, [{:let, tmp, value_ir}, body_ir]}
- tap/2: apply function for side-effect, return original value
In the pure WASM subset (no side effects), tap simply returns
the original value, allowing tap/2 calls in pipelines to compile
Both local call syntax (then/tap) and Kernel remote call syntax
(Kernel.then/Kernel.tap) are supported. Works with pipe operator
for idiomatic Elixir pipeline chains.
Includes 14 tests covering:
- Basic then/2 and tap/2 compilation
- Pipeline chaining (value |> then(...) |> then(...))
- Mixed tap/then pipelines
- Multi-expression function bodies
- Kernel.then/2 and Kernel.tap/2 remote call syntax
- WASM execution correctness
- Optimization pass interaction (constant folding through then)
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Summary
Add support for Elixir's
then/2andtap/2functions in the Firebird compiler, enabling idiomatic functional pipeline patterns in WASM-compiled code.Changes
then/2— Transform values in pipelinesCompiles to efficient let-bindings in IR, then optimized WASM locals.
tap/2— Pass-through in pipelinesSince the WASM subset is pure (no side effects),
tap/2compiles to an identity — the function body is dead code. This allowstap/2calls in pipelines to compile cleanly.Supported syntax
then(value, fn x -> body end),tap(value, fn x -> body end)Kernel.then(value, fn x -> body end),Kernel.tap(value, fn x -> body end)value |> then(fn x -> body end),value |> tap(fn x -> body end)Tests
14 new tests covering compilation, WASM execution correctness, pipeline chaining, Kernel remote syntax, and optimization pass interaction.