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Chez Phase 1 (increment 3i): regex via vendored irregex

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Closes the last clojure.core prelude emit gap (parse-uuid): the whole
non-macro core now lowers to Scheme (prelude reach 355/355).

A #"..." literal analyzes to a :regex IR node. The Chez back end emits
a jolt-regex value over irregex (Alex Shinn, BSD), vendored as the
vendor/irregex submodule -- a portable Scheme regex with PCRE/Java-style
string patterns and first-class Chez support. host/chez/regex.ss wraps
jolt's re-* surface over it: irregex-match -> re-matches (anchored),
irregex-search -> re-find, groups as Clojure [whole g1 ...] vectors,
re-seq as a jolt seq. re-pattern/re-matches/re-find/re-seq/regex? are
def-var!'d into clojure.core so prelude / -e code resolves them.

They stay OUT of the subset native-ops on purpose: irregex's
Unicode/property-class semantics differ from the seed's byte-PEG
approximation, so keeping them prelude-only avoids dragging
engine-difference divergences into the subset-parity corpus. The Janet
back end punts :regex to the interpreter (the seed compiles #"..." to a
Janet PEG), so the main language is unchanged.

Only two adaptations for Chez's top level: a cond-expand shim (Chez's is
library-only) and a normalizing error wrapper (silences irregex's 1-arg
error warnings). rt.ss load is ~0.18s.

emit-test 131/131 (regex literal + re-* parity vs the CLI oracle);
prelude reach 355/355; Chez subset 672/672, 0 divergences; full gate
green.
This commit is contained in:
Yogthos 2026-06-17 19:44:18 -04:00
parent b1cdfd1c9b
commit 37c433bd4a
11 changed files with 164 additions and 14 deletions
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5
host/chez/emit.janet
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@ -369,6 +369,11 @@
:throw (string "(jolt-throw " (emit (get node :expr)) ")")
:try (emit-try node)
:quote (emit-quoted (get node :form))
# regex literal #"…" -> a jolt-regex value (regex.ss compiles the source via
# the vendored irregex). %j quotes+escapes the source; a backslash in the
# pattern becomes \\ in the Scheme string literal -> the 1-char backslash
# irregex expects (same escaping emit-const uses for strings).
:regex (string "(jolt-regex " (string/format "%j" (get node :source)) ")")
# host interop (jolt-0kf5): (.method target arg*) -> (jolt-host-call "method"
# target arg*). Only the methods the RT dispatcher (rt.ss) actually shims are
# IN the subset; any other method is out of subset (a clean emit-time reject,