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smalltalk: expression parser + 47 parse tests
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giles
2026-04-25 00:46:03 +00:00
parent 4e7d2183ad
commit 33ce994f23
4 changed files with 1036 additions and 8 deletions
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plans/smalltalk-on-sx.md
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@@ -51,8 +51,9 @@ Core mapping:
### Phase 1 — tokenizer + parser
- [x] Tokenizer: identifiers, keywords (`foo:`), binary selectors (`+`, `==`, `,`, `->`, `~=` etc.), numbers (radix `16r1F`; **scaled `1.5s2` deferred**), strings `'…''…'`, characters `$c`, symbols `#foo` `#'foo bar'` `#+`, byte arrays `#[1 2 3]` (open token), literal arrays `#(1 #foo 'x')` (open token), comments `"…"`
- [ ] Parser: chunk format (`! !` separators), class definitions (`Object subclass: #X instanceVariableNames: '…' classVariableNames: '…' …`), method definitions (`extend: #Foo with: 'bar ^self'`), pragmas `<primitive: 1>`, blocks `[:a :b | | t1 t2 | …]`, cascades, message precedence (unary > binary > keyword)
- [ ] Unit tests in `lib/smalltalk/tests/parse.sx`
- [x] Parser (expression level): blocks `[:a :b | | t1 t2 | …]`, cascades, message precedence (unary > binary > keyword), assignment, return, statement sequences, literal arrays, byte arrays, paren grouping, method headers (`+ other`, `at:put:`, unary, with temps and body). Class-definition keyword messages parse as ordinary keyword sends — no special-case needed.
- [ ] Parser (chunk-stream level): `! !` chunk separators driving a sequence of top-level expressions, pragmas `<primitive: 1>` inside method bodies
- [x] Unit tests in `lib/smalltalk/tests/parse.sx`
### Phase 2 — object model + sequential eval
- [ ] Class table + bootstrap: `Object`, `Behavior`, `Class`, `Metaclass`, `UndefinedObject`, `Boolean`/`True`/`False`, `Number`/`Integer`/`Float`, `String`, `Symbol`, `Array`, `Block`
@@ -107,6 +108,7 @@ Core mapping:
_Newest first. Agent appends on every commit._
- 2026-04-25: expression-level parser + 47 parse tests (`lib/smalltalk/parser.sx`, `lib/smalltalk/tests/parse.sx`). Full message precedence (unary > binary > keyword), cascades, blocks with params/temps, literal/byte arrays, assignment chain, method headers (unary/binary/keyword). Chunk-format `! !` driver deferred to a follow-up box. 110/110 tests pass.
- 2026-04-25: tokenizer + 63 tests (`lib/smalltalk/tokenizer.sx`, `lib/smalltalk/tests/tokenize.sx`, `lib/smalltalk/test.sh`). All token types covered except scaled decimals `1.5s2` (deferred). `#(` and `#[` emit open tokens; literal-array contents lexed as ordinary tokens for the parser to interpret.
## Blockers