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DSL: bind "turn" symbol in during retract handler

This commit is contained in:
Emery Hemingway 2022-06-16 12:13:28 -05:00
parent 57e4bb6bad
commit 7f0277fe85
1 changed files with 4 additions and 4 deletions
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8
src/syndicate.nim
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@ -327,17 +327,17 @@ proc wrapDuringHandler(entryBody, exitBody: NimNode): NimNode =
`varSectionOuter`
if fromPreserve(`valuesSym`, `bindingsSym`):
`publishBody`
proc action(turn: var Turn) =
proc action(`turnSym`: var Turn) =
`exitBody`
result = action
macro during*(turn: Turn; ds: Ref; pattern: Pattern; publishBody, retractBody: untyped) =
macro during*(turn: var Turn; ds: Ref; pattern: Pattern; publishBody, retractBody: untyped) =
## Call `publishBody` when an assertion matching `pattern` is published to `ds` and
## call `retractBody` on retraction. Assertions that match `pattern` but are not
## convertable to the arguments of `publishBody` are silently discarded.
##
## The following symbols are injected into the scope of both bodies:
## - `turn` - active turn at entry of `publishBody`
## - `turn` - active turn at entry of `publishBody` and `retractBody`
## - `bindings` - raw Preserves sequence that matched `pattern`
## - `duringHandle` - dataspace handle of the assertion that triggered `publishBody`
let
@ -347,7 +347,7 @@ macro during*(turn: Turn; ds: Ref; pattern: Pattern; publishBody, retractBody: u
`callbackProc`
discard observe(`turn`, `ds`, `pattern`, during(`callbackSym`))
macro during*(turn: Turn; ds: Ref; pattern: Pattern; publishBody: untyped) =
macro during*(turn: var Turn; ds: Ref; pattern: Pattern; publishBody: untyped) =
## Variant of `during` without a retract body.
let
callbackProc = wrapDuringHandler(publishBody, nil)