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feat: to-position case functions and same-map stage runs - #6
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The ISC corpus and the Ruby runtime express two constructs the
converter rejected:
- sub { from X to upcase } — the replacement is the match itself passed
through the casing function. The converter now emits subst ops with a
case field; the engine applies _CASE_FNS to the matched text
(upcase/downcase/title_case/swapcase/strip/reverse).
- run stage.X — same-map named runs now inline the referenced stage's
converted rules at conversion time (chained runs follow; cycles raise
a clear error). Stage names survive conversion as a result.
- run stage.X where X belongs to an imported (alias-less) dependency
resolves to a run op over the imported map.
Also unblocks the Ruby compiler bridge: interscript-ruby serializes
in-memory documents to ISC and executes them through this runtime.
The Ruby bridge regenerates synthetic documents under reused names; without eviction the stale engine keeps serving the old document.
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What
Three ISC constructs the converter rejected, all needed by the Ruby runtime's DSL vocabulary (and present in corpus maps):
sub { from X to upcase }— the replacement is the match itself passed through the casing function. The converter emitssubstops with acasefield; the engine applies_CASE_FNS(upcase/downcase/title_case/swapcase/strip/reverse) to the matched text.run stage.X(same-map named runs) — inlined at conversion time: the referenced stage's converted rules splice into the calling stage, so each converted stage is self-contained (the engine keeps its flat rule list). Chained runs (one → two → three) follow transitively; cycles raise a clearcyclic run stage.Xerror.run stage.Xwhere X belongs to an imported (alias-less) dependency — resolves to arunop over the imported map, matching import semantics that merge its stages into scope.Why now
interscript-ruby's
Compiler::Pythonbridge is being reworked to serialize in-memory documents to ISC and execute them through this runtime (the old bridge wrote generated.pymodules — a contract this runtime no longer has). The dsl_stage/reversibility vocabulary needs these constructs.Tests
subst.caseopINTERSCRIPT_MAPS_PATH), no regressions