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A condition was any number, non-zero being true: done was a number field,
a view showed 1 for true, and done + 1 was no type error. Now bool is its
own type (Pure 016, module format v6):
- true and false; comparisons, text comparisons, has and ! && || give a
bool. Bools are equal or not; they are no numbers and have no order.
- if, conditional expressions, require, where (folds, walks, filtered
tables) take a bool. Given a number, the diagnostic says how to make
one: "if takes a bool, not a number: compare it, as in n != 0".
- Bool states (state on = false), record fields (done = false), message,
output and argument fields (ok: bool), lets, views and columns.
Interpolation writes true or false. A list is not keyed by a bool.
- The examples' flags are bools (charge's holding, toggle's visible,
tasks' done).
Checks: 20 bool diagnostics, a form using bools everywhere, an app whose
every output shows true and false (states, items, views, columns, text)
and whose replacement turns a number into a bool and back. Models hold
bools and compare them strictly: Python's True == 1 no longer hides a 1
where a true belongs. Generated programs are typed, numbers and bools.
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state xs: list of R by field keeps its items in that field's order, each
key once: xs.add(R { ... }) places an item (a taken key fails the event
with exists), xs[key] finds one by halving (its field, or its index),
xs.has(key) asks, xs.remove(key) removes. append and insert are refused
on a keyed list, add on another, and a key field is never assigned.
Texts compare with == != < <= > >= by their bytes.
Checked against a Python model over 3,600 random steps with a text-keyed
and a number-keyed list; 13 diagnostics; examples/tally.aup.
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`state from: mark in note` is a cursor that stays before text inserted
at its position; `cursor in` goes after it, as a caret does. Everything
a cursor takes, a mark takes too. The notes example's mark is now one,
and its reference model agrees: typing at the mark leaves it in place.
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fn name(params) = value declares one expression, inlined where it is
called: arguments are computed once onto the stack and the body reads them
with PICK, so a fn costs no runtime call and keeps Pure's bound on work.
Parameters take any kind of value; recursion is a compile error.
use name reads name.aup beside the source or from AUP_PATH. A library
declares only fns and uses, sees only its parameters, and is called as
name.fn(...). Diagnostics now carry the file they are in, and the
compiler takes a loader so that sources come from the host.
examples/words.aup is such a library; examples/tasks.aup uses it and still
matches its reference model.
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if c { a } else { b }, with else-if chains, is an expression anywhere a
value goes. Only the chosen branch runs, every branch gives the same type,
and nesting that would pass Pure's limit of 8 value-carrying joins is a
compile error.
view name = each row in list { column = value ... } declares a table with
a row per item; columns read their row as an index of the list. An index
now reads and writes its item's fields directly (at.title, at.done = 1),
so 'position' cannot name a record field.
examples/tasks.aup gains conditional views and a board table and still
matches its reference model; a new check confirms the unchosen branch is
never computed.
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A record declares named number and text fields with defaults. A list of a
record is runtime-owned state, and an index of a list always names one of
its items: it follows its item across inserts and removes and stops at the
ends. Items are read and changed by field (tasks[at].title), appended or
inserted as record values whose missing fields take defaults, and removed
by index. Using an index of another list is a compile error.
examples/tasks.aup matches a Python reference model over 4,800 random steps,
including events that fail on an empty list. Replacing it with a module
whose record gained and reordered fields keeps every item.
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aup now emits Pure module v3 and adds text states with string initializers,
cursors bound to a text, text inputs, string literals with escapes and
{interpolation} of numbers and text, cursor distances in chars and lines,
.start/.end, insert/remove, name.line(cursor), .chars/.lines/.bytes on text,
.chars/.line on cursors, and text(bytes)/bytes(text). Replies and replace
accept text as its UTF-8 bytes. Views are numbers or text. Up to 32 inputs.
examples/notes.aup is a small editor. make check replays random typing
(ASCII, Korean, emoji, combining marks, NUL, newlines), moves and deletions
against a Python reference model: 4,800 snapshots of text, cursor, mark and
views match. It also checks escapes and number text, 16 new diagnostics, a
document loaded into text and saved back, and all earlier parity; the
compiler and the Pure executor each pass under ASan/UBSan.
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aup now emits Pure module v2 and adds keyed byte collections
(state documents: bytes by key), message inputs by key with u32 and a
trailing bytes field, on-message handlers, field access, name[key] reads
and .bytes sizes, replace(a .. b, value), reply and require, all checked
for number/bytes types with file:line:column diagnostics.
The document editor and its size-bounded variant are rewritten in aup.
make check runs them through pure-edit-module against pure-edit running the
original editor.pure programs: 1,280 random show/edit/apply operations,
including conflicts, limits, missing documents, budgets and invalid keys,
produce byte-identical stdout, stderr and exit codes, and each CLI reads the
other's store identically. v0a parity with the workbench engine, 33
diagnostics and generated/damaged programs still pass, also with a
sanitizer-built compiler.
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aup check/build parse states, key inputs, views and handlers (with if/else
and else-if), resolve names, generate forward-only stack code and encode a
Pure module v1 deterministically. Diagnostics carry file:line:column.
make check loads every module with Pure's verifier, checks determinism, 20
diagnostics and accepted forms, replacement by name, 600 generated programs
and damaged sources (every emitted module verifies), and replays random event
scripts against the workbench Zig engine: 16,667 snapshots across counter,
toggle, charge, else-if and fault programs matched, including 921 failed
events. The sanitizer-built compiler passes the same checks.
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