DVM v10 language: structured control flow, subroutines, arrays, mapkeys, Bool, Int, CONST (fixes #125) - #126
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…rrays, mapkeys, Bool, Int, CONST
The complete DVM-BASIC language expansion in one coherent package (gated
>=10.0.0), consolidated from the L-series:
L1 structured control flow — FOR/NEXT, WHILE/WEND, block IF/ELSE/ENDIF
L2 subroutines — GOSUB/RETURN (CallStack on the interpreter)
L3 RAM arrays — DIM a(n), a[i] get/set, arrlen() (Locals-only, consensus-neutral)
L4 mapkeys() — SC state key enumeration
L6 Bool type — TRUE/FALSE constants, && / || / !
L7 CONST — named immutable constants
L8 enforced version gate — every new keyword requires version("10.0.0")
L9 signed integers — Int type, negative literals, signed arithmetic
Backward compatible: all new syntax gated behind version("10.0.0"); a
contract at 1.2.3 (or no version call) is rejected from using it, so
pre-fork contracts are unaffected.
Tests: control_flow_test.go + l2/l3/l4/l6/l7/l9 (33 tests across the
suite), full dvm suite green.
Build manifest (go.mod/go.sum/prompt.go KickReader fix) included because
community-dev does not build from a fresh clone.
This was referenced Aug 25, 2026
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Summary
One reviewable PR replacing seven stacked PRs (#101, #103, #107, #109, #111,
#115, #117). The complete DVM v10 language: structured BASIC.
What's in it
FOR x = a TO b [STEP z]/NEXT,WHILE/WEND, blockIF/ELSE/ENDIFGOSUB <line>/RETURNDIM a(n) AS type,a[i],arrlen(a)mapkeys()DIM b AS Bool,TRUE/FALSE,&&/`CONST name = valueversion("10.0.0")DIM i AS Int, negative literals, signed arithmeticDesign notes (why it's safe)
>=10.0.0— pre-fork contracts can never accidentally parse newsyntax (
gateControlFlowrejects versions withoutversion()).*[]Variable), Bool, Int are Locals-only — never serialized toRamStore/storage, so the change is consensus-neutral on the state tree.Variable.Arrayis a pointer soVariablestays comparable (it's a map key).IF THEN GOTO(untouched).RETURNpops theCallStackwhen non-empty (subroutine return), otherwisethe existing function-return semantics are unchanged.
Tests
14 files, 8 control-flow test suites (L1–L9) covering: FOR sum/step/nesting,
WHILE countdown, IF/ELSE both branches, nested GOSUB, array fill via loop +
get/set + arrlen, Bool logic + params, CONST immutability, Int negative
arithmetic, and version-gate rejection. Plus a wargame test.
Supersedes
Closes #101, #103, #107, #109, #111, #115, #117 in favour of this single
package.