Orkuncakilkaya
0d1b09e4f0
A fallible function returns a `result` value, built with ok(payload) on success
or err(message) on failure. The caller recovers a value with `try EXPR else {
… }`: on ok the whole expression is the payload; on err the else block runs —
with the failure message bound to `error` — and its trailing expression supplies
the fallback. It is a plain branch on the result's tag: no exceptions, no hidden
control flow, nothing unwinds. is_ok(r) / is_err(r) classify without unwrapping.
Payloads are any i32-width scalar (int/fixed/bool/entity). The feature is
additive and only kicks in when ok/err/try are used, so untouched programs
compile byte-identically (verified) and the C-free bootstrap fixpoint holds.
Complements panic/assert from #8 (the unrecoverable half). The optional
top-level frame `recover` stays deferred (needs a frame-abort mechanism); the
full tagged-union/any generalization is tracked in #1.
Adds the `try` keyword and ok/err/is_ok/is_err builtins across the compiler,
the vocabulary header, JetBrains + TextMate/VSCode grammars, the docs inventory
and pages, examples/library/recover.ludic, and a regression case.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
89 lines
3.6 KiB
Text
89 lines
3.6 KiB
Text
# ast.ludic — the node kinds and the single Node shape they share, plus the
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# declaration tables the emitter reads. Mirrors compiler/front/ast.h + sem/.
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# declarations
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const N_STRUCT: int = 0
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const N_FIELD: int = 1
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const N_VAR: int = 2
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const N_CONST: int = 3
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const N_FN: int = 4
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const N_PARAM: int = 5
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const N_MAIN: int = 6
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const N_BLOCK: int = 7
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const N_COMP: int = 8
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const N_SYS: int = 9
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const N_ARCH: int = 10
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const N_EXTERN: int = 11
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const N_UI: int = 12
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const N_ENUM: int = 27 # enum Name { A, B, ... } — named int constants
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const S_TOGGLE: int = 28 # enable/disable (ival: 1=enable 0=disable; s=target; a=entity or null)
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const N_SCENE: int = 45 # scene Name [start] { on enter{} on exit{} layer L { handlers } }
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# s=name ival=scene id a=on-enter block b=on-exit block
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const S_ATTACH: int = 46 # attach P on e [{ overrides }] — add a property to a live entity
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# s=property a=entity expr b=override record (E_REC) or null
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const S_DETACH: int = 47 # detach P on e — remove a property from a live entity
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# s=property a=entity expr
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const N_EVENT: int = 48 # event Name { field: T = default, ... } — a public event payload
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# s=name kids=payload fields (N_FIELD)
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const S_EMIT: int = 49 # emit E(field: v, ...) — fire event E (calls its @On listeners)
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# s=event name a=E_REC of named args; also usable as an
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# expression (a cancellable event returns its cancelled flag)
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const S_CANCEL: int = 50 # cancel — inside a listener, veto a `cancellable` event
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const N_TEST: int = 51 # test "name" { ... } — a named test block (the testing framework)
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# s=name a=body block line=source line of the test
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const E_TRY: int = 52 # try EXPR else { ... } — recover a fallible result as a value (issue #46)
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# a=the fallible (result-typed) expression b=else block (its
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# trailing expression is the fallback) line=source line
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# statements
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const S_LET: int = 10
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const S_ASSIGN: int = 11
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const S_IF: int = 12
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const S_WHILE: int = 13
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const S_FOR: int = 14
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const S_RETURN: int = 15
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const S_EXPR: int = 16
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const S_BREAK: int = 17
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const S_CONTINUE: int = 18
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const S_MATCH: int = 19
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const S_MARM: int = 20
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const S_QUERY: int = 21
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const S_SPAWN: int = 22
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const S_DESPAWN: int = 23
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const S_MACHINE: int = 24
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const S_STATE: int = 25
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const S_BECOME: int = 26
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# expressions
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const E_INT: int = 30
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const E_STR: int = 31
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const E_BOOL: int = 32
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const E_ID: int = 33
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const E_CALL: int = 34
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const E_MEMBER: int = 35
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const E_INDEX: int = 36
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const E_BIN: int = 37
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const E_UN: int = 38
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const E_NEW: int = 39
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const E_FLOAT: int = 40
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const E_REC: int = 41
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const E_FINIT: int = 42
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const E_NULL: int = 43 # the `null` pointer literal
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const E_SLICE: int = 44 # s[a..b] — substring (a=base, b=start, c=end)
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property Node {
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kind: int = 0
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s: pointer = null # name / operator / string / type-of-new
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ival: int = 0 # int literal, bool, flags
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ty: pointer = null # declared type (let/param/field/fn/var/const)
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a: Node # fixed children (meaning per kind)
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b: Node
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c: Node
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kids: []Node # variadic children
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line: int = 0
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}
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function node(kind: int) -> Node {
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let n = new Node
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n.kind = kind
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n.kids = new []Node
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return n
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}
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