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Module format v3 adds text states, cursors, UTF-8 constants, text inputs
and text views. A text state is a runtime-owned draft without a store, so a
large text edits as an extent tree. Cursors are byte positions the runtime
keeps on character boundaries: insertion pushes cursors at or after the
point, removal gathers cursors inside the range, and a failed event returns
every text draft and cursor to where it was. The verifier types a cursor by
the text it belongs to and rejects editing one text with another's cursor.
Operations cover constants, concatenation, shortest round-trip number text,
character, line and byte counts, character and column-keeping line moves,
insert, remove, line views, whole-text replacement and UTF-8 checked
conversion from bytes. Replies of edited documents or texts are copied before
they are finished. pure-run gains text input and text output.
test-module covers typing Korean and emoji, moves that stop at the ends,
line moves, views, rollback, invalid UTF-8 and replacement, text-specific
verifier rules, and 20,000 damaged text modules whose cursors always stay
on character boundaries under ASan/UBSan.
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Module format v2 adds byte values, message inputs with u32 and bytes-tail
fields, one keyed byte collection, replies and require. The verifier checks
every operand's type and the context each operation may run in, and allows
branches and joins only at an empty stack, so typed values never merge.
A message event opens its key's working version through a PureData host,
conflicts early on a stale base revision, runs its handlers, and commits
only if they succeed; a failed event leaves documents and states unchanged.
Replies lend payload or document extents, and a document reply is copied
before commit. pure_tree_data implements the host on tree store drafts, and
pure-edit-module offers the document CLI contract of pure-edit from a module.
test-module adds document semantics on an in-memory host (not found, create,
conflict before bounds, limits, short payloads, busy commits, stable replies,
require, state rollback), typed verifier rules, and 20,000 damaged message
modules run safely under ASan/UBSan.
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Pure now owns the format its toolchains target, as the JVM owns class files.
A v1 module carries f64 states, key inputs, atomic event handlers and pure
views. pure_module_load checks sizes, names, keys, operands, forward-only
branches, reachability and stack heights at every join before anything runs,
so execution needs no stack checks and each event is bounded by its handler
length. PureApp runs events on a pending copy and replaces modules keeping
states by name, without allocation. Semantics match the workbench engine,
including IEEE minimum/maximum on signed zeros.
test-module covers behaviour, atomic faults, 26 rejection checks and 20,000
damaged modules under ASan/UBSan; pure-run is a JSON test host.
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The recorded Raspberry Pi 5 (Linux AArch64, 16 KiB pages, ext4) replaces
Apple Silicon macOS as the device whose results decide completion. The macOS
CI job stays as an optional portability check; no macOS support is claimed.
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state.h gives any app a runtime-owned working version of a stored value on
the tree store. A draft shares unchanged extents with the stored version,
edits in memory by path copying, lends ordered extents without copying, and
commits only its new nodes when the key is still at its base revision. A
failed commit changes neither the draft nor the store; a draft whose file was
replaced by compaction copies its stored extents on commit. Unreachable
arena nodes are reclaimed once they outweigh max(reachable, 32 KiB).
Typing into the middle of a 1 MiB document and saving each character peaked
at about 1,660 KiB RSS with a draft against about 4,480 KiB for an app copy
compared with storage on save; saves were only 1-2 ms faster. This corrects
073, which had attributed the TUI's remaining 8 ms to that comparison.
Drafts are not yet charged to the runtime budget or visible to .pure
definitions.
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store-tree.c keeps every document in one append-only file as a persistent
B-tree of byte extents, with the key catalog in the same structure. A splice
writes only the changed leaf and path; unchanged extents are shared between
versions, readers take no lock, and two alternating head slots publish a
commit after its nodes are durable. Compaction rewrites reachable nodes.
On the recorded ext4 host a durable 1-byte middle insert into a 1 MiB
document took 8.58 ms against 78.51 ms for the default store, and the real
TUI's Ctrl+S after typing took 16.60 ms against 84.59 ms. check-tree runs the
store's crash/oracle tests and the unchanged runtime, splice, async and
real-PTY editor checks on it. It stays opt-in: linked code is 12.7 KB larger
and contiguous multi-leaf reads copy.
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