Different ?? pattern operator
Make the ?? operator convert a pattern to a pattern of itself and inject other patterns into it.
This commit is contained in:
parent
831b7194a9
commit
b0f5ff98e2
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@ -27,158 +27,16 @@ runnableExamples:
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import std/[macros, tables, typetraits]
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import preserves
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import ./syndicate/[actors, dataspaces, durings, patterns]
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import ./syndicate/protocols/dataspace
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from ./syndicate/relays import connectStdio, connectUnix
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export Actor, Assertion, Facet, Handle, Ref, Symbol, Turn, TurnAction,
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`$`, `?`, `??`, bootDataspace, connectStdio, connectUnix, drop, facet,
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`$`, `?`, analyse, bootDataspace, connectStdio, connectUnix, drop, facet,
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future, grab, message, newDataspace, publish, retract, replace, run, stop, unembed
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proc `?`*[T](val: T): Pattern =
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## Construct a `Pattern` from value of type `T`.
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when T is Pattern: result = val
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elif T is Ref:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.embedded,
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embedded: embed(val))))
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elif T is ptr | ref:
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if system.`==`(val, nil): result = ?(Symbol "null")
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else: result = ?(val[])
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elif T is bool:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.bool,
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bool: val)))
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elif T is float32:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.float,
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float: val)))
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elif T is float64:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.double,
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double: val)))
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elif T is SomeInteger:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.int,
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int: AnyAtomInt val)))
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elif T is string:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.string,
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string: val)))
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elif T is seq[byte]:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.bytes,
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bytes: val)))
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elif T is enum or T is Symbol:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.symbol,
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symbol: Symbol $val)))
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elif T.hasPreservesRecordPragma:
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var
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label = T.recordLabel.tosymbol(Ref)
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fields = newSeq[Pattern]()
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for f in fields(val):
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fields.add ?f
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result = ?DCompound(
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orKind: DCompoundKind.rec,
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rec: DCompoundRec(
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label: label, fields: fields))
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else:
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?(toPreserve(val, Ref))
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proc `?`*(T: static typedesc): Pattern =
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## Construct a `Pattern` from type `T`.
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runnableExamples:
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import preserves
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type Point = tuple[x: int; y: int]
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assert $(?Point) == "<arr [<bind <_>> <bind <_>>]>"
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type Rect {.preservesRecord: "rect".} = tuple[a: Point; B: Point]
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assert $(?Rect) == "<rec rect [<arr [<bind <_>> <bind <_>>]> <arr [<bind <_>> <bind <_>>]>]>"
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type ColoredRect {.preservesDictionary.} = tuple[color: string; rect: Rect]
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assert $(?ColoredRect) == "<dict {color: <bind <_>>, rect: <rec rect [<arr [<bind <_>> <bind <_>>]> <arr [<bind <_>> <bind <_>>]>]>}>"
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## Derive a `Pattern` from type `T`.
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## This works for `tuple` and `object` types but in the
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## general case will return a wildcard binding.
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when T is ref:
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?pointerBase(T)
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elif T.hasPreservesRecordPragma:
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var
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label = T.recordLabel.tosymbol(Ref)
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fields = newSeq[Pattern]()
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for key, val in fieldPairs(default T):
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fields.add ?(typeOf val)
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result = ?DCompound(
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orKind: DCompoundKind.rec,
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rec: DCompoundRec(
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label: label, fields: fields))
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elif T.hasPreservesDictionaryPragma:
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var dict = DCompoundDict()
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for key, val in fieldPairs(default T):
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dict.entries[key.toSymbol(Ref)] = ?(typeOf val)
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?DCompound(
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orKind: DCompoundKind.dict,
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dict: dict)
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elif T.hasPreservesTuplePragma or T is tuple:
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var arr = DCompoundArr()
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for key, val in fieldPairs(default T):
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arr.items.add ?(typeOf val)
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?DCompound(
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orKind: DCompoundKind.arr,
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arr: arr)
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else:
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grab() # otherwise an abritrary capture
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proc fieldCount(T: typedesc): int =
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for _, _ in fieldPairs(default T):
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inc result
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proc `?`*(T: static typedesc; bindings: sink openArray[(int, Pattern)]): Pattern =
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## Construct a `Pattern` from type `T` that selectively captures fields.
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runnableExamples:
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import preserves
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type Point = tuple[x: int; y: int; z: int]
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assert $(Point ? {2: grab()}) == "<arr [<_> <_> <bind <_>>]>"
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when T is ref:
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`?`(pointerBase(T), bindings)
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elif T.hasPreservesRecordPragma:
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var
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label = T.recordLabel.tosymbol(Ref)
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fields = newSeq[Pattern](fieldCount T)
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for (i, pat) in bindings:
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fields[i] = pat
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for pat in fields.mitems:
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if pat.isNil: pat = drop()
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result = ?DCompound(
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orKind: DCompoundKind.rec,
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rec: DCompoundRec(
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label: label, fields: fields))
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elif T is tuple:
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var arr = DCompoundArr()
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for (i, pat) in bindings:
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if i > arr.items.high: arr.items.setLen(succ i)
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arr.items[i] = pat
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for pat in arr.items.mitems:
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if pat.isNil: pat = drop()
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result = ?DCompound(
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orKind: DCompoundKind.arr,
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arr: arr)
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else:
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{.error: "no preserves pragma on " & $T.}
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type
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Observe* = dataspace.Observe[Ref]
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PublishProc = proc (turn: var Turn; v: Assertion; h: Handle) {.closure.}
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RetractProc = proc (turn: var Turn; h: Handle) {.closure.}
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MessageProc = proc (turn: var Turn; v: Assertion) {.closure.}
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@ -7,7 +7,7 @@ import preserves
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import ./protocols/dataspacePatterns
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from ./actors import Ref
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export dataspacePatterns.`$`, PatternKind, DCompoundKind
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export dataspacePatterns.`$`, PatternKind, DCompoundKind, AnyAtomKind
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type
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Assertion = Preserve[Ref]
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@ -63,6 +63,7 @@ proc `?`*(x: sink Symbol): Pattern =
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?AnyAtom(orKind: AnyAtomKind.`symbol`, symbol: x)
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proc `?`*[T](pr: Preserve[T]): Pattern =
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## Convert a `Preserve` value to a `Pattern`.
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assert not pr.embedded
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case pr.kind
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of pkBoolean: ?pr.bool
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@ -75,9 +76,9 @@ proc `?`*[T](pr: Preserve[T]): Pattern =
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of pkRecord:
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?DCompoundRec(
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label: pr.label,
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fields: map[Preserve[T], Pattern](pr.fields, `?`[T]))
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fields: map[Preserve[T], Pattern](pr.fields, `?`))
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of pkSequence:
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?DCompoundArr(items: map(pr.sequence, `?`[T]))
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?DCompoundArr(items: map(pr.sequence, `?`))
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of pkSet: raise newException(
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ValueError, "cannot construct a pattern over a set literal")
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of pkDictionary:
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@ -87,38 +88,311 @@ proc `?`*[T](pr: Preserve[T]): Pattern =
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of pkEmbedded:
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raiseAssert "cannot construct a pattern over a embedded literal"
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proc `??`*(pat: Pattern): Pattern =
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## Construct a `Pattern` that matches a `Pattern`.
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case pat.orKind
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of PatternKind.DDiscard, PatternKind.DBind:
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result = pat
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of PatternKind.DLit:
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result = ?(pat.toPreserve(Ref))
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of PatternKind.DCompound:
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case pat.dcompound.orKind
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of DCompoundKind.rec:
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var fields = move pat.dcompound.rec.fields
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result = ?(pat.toPreserve(Ref))
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result.dcompound.rec.fields[1].dcompound.arr.items = fields
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of DCompoundKind.arr:
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var items = move pat.dcompound.arr.items
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result = ?(pat.toPreserve(Ref))
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result.dcompound.rec.fields[0].dcompound.arr.items = items
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of DCompoundKind.dict:
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# var entries = move pat.dcompound.dict.entries
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# result = ?(pat.toPreserve(Ref))
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stderr.writeLine "pattern construction from DCompoundKind not implemented"
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raiseAssert "not implemented"
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proc drop*(): Pattern = Pattern(orKind: PatternKind.DDiscard)
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proc grab*(): Pattern = ?DBind(pattern: drop())
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## Create a pattern to match any value without capture.
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proc `?_`*(): Pattern = drop()
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proc `?*`*(): Pattern = grab()
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proc grab*(): Pattern = ?DBind(pattern: drop())
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## Create a pattern to capture any value.
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proc `?`*[A, B](table: TableRef[A,B]): Pattern =
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raiseAssert "not implemented"
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#[
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proc `?`*(pat: sink Pattern): Pattern =
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## Construct a `Pattern` that matches a `Pattern`.
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case pat.orKind
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of PatternKind.DDiscard: result = pat
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of PatternKind.DBind: result = drop()
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of PatternKind.DLit: result = ?pat.toPreserve(Ref)
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of PatternKind.DCompound:
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case pat.dcompound.orKind:
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of DCompoundKind.rec:
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var fields = move pat.dcompound.rec.fields
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for f in fields.mitems: f = ?(move f)
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result = ?pat.toPreserve(Ref)
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# echo "need to stuff fields into ", result, " at ", result.dcompound.rec.fields[1].dcompound.arr.items
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result.dcompound.rec.fields[1].dcompound.arr.items = fields
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#[
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of DCompoundKind.arr
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pat.dcompound.arr
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of DCompoundKind.dict
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pat.dcompound.dict
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]#
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else: raiseAssert "`?` not implemented for pattern " & $pat
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]#
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#[
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proc `?`*(patterns: openArray[Pattern]): Pattern =
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raiseAssert "got it in the right place"
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#[
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result = DCompoundArr()
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for e in val:
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if i > arr.items.high: arr.items.setLen(succ i)
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arr.items[i] = pat
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for pat in arr.items.mitems:
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if pat.isNil: pat = drop()
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result = ?DCompound(
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orKind: DCompoundKind.arr,
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arr: arr)
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]#
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]#
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proc `?`*[T](val: sink T): Pattern =
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## Construct a `Pattern` from value of type `T`.
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#[
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when T is Pattern:
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case val.orKind
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of PatternKind.DDiscard, PatternKind.DBind: result = val
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of PatternKind.DLit: result = ?val.toPreserve(Ref)
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of PatternKind.DCompound:
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case val.dcompound.orKind:
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of DCompoundKind.rec:
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var fields = move val.dcompound.rec.fields
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for f in fields.mitems: f = ?(move f)
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result = ?val.toPreserve(Ref)
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# echo "need to stuff fields into ", result, " at ", result.dcompound.rec.fields[1].dcompound.arr.items
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result.dcompound.rec.fields[1].dcompound.arr.items = fields
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#[
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of DCompoundKind.arr
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val.dcompound.arr
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of DCompoundKind.dict
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val.dcompound.dict
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]#
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else: raiseAssert "`?` not implemented for pattern " & $val
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]#
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when T is Ref:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.embedded,
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embedded: embed(val))))
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elif T is ptr | ref:
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if system.`==`(val, nil): result = ?(Symbol "null")
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else: result = ?(val[])
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elif T is bool:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.bool,
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bool: val)))
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elif T is float32:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.float,
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float: val)))
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elif T is float64:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.double,
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double: val)))
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elif T is SomeInteger:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.int,
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int: AnyAtomInt val)))
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elif T is string:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.string,
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string: val)))
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elif T is seq[byte]:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.bytes,
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bytes: val)))
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elif T is array | seq:
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let arr = DCompoundArr(items: newSeq[Pattern](val.len))
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for i, e in val.mitems: arr.items[i] = ?(move e)
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result = ?arr
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elif T is Symbol:
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result = Pattern(orKind: PatternKind.DLit, dlit: DLit(
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value: AnyAtom(
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orKind: AnyAtomKind.symbol,
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symbol: Symbol $val)))
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elif T.hasPreservesRecordPragma:
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var
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label = T.recordLabel.tosymbol(Ref)
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fields = newSeq[Pattern]()
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for f in fields(val):
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fields.add ?f
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result = ?DCompound(
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orKind: DCompoundKind.rec,
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rec: DCompoundRec(
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label: label, fields: fields))
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else:
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?(toPreserve(val, Ref))
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proc `?`*(T: static typedesc): Pattern =
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## Derive a `Pattern` from type `T`.
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## This works for `tuple` and `object` types but in the
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## general case will return a wildcard binding.
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runnableExamples:
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import preserves
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type Point = tuple[x: int; y: int]
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assert $(?Point) == "<arr [<bind <_>> <bind <_>>]>"
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type Rect {.preservesRecord: "rect".} = tuple[a: Point; B: Point]
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assert $(?Rect) == "<rec rect [<arr [<bind <_>> <bind <_>>]> <arr [<bind <_>> <bind <_>>]>]>"
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type ColoredRect {.preservesDictionary.} = tuple[color: string; rect: Rect]
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assert $(?ColoredRect) == "<dict {color: <bind <_>>, rect: <rec rect [<arr [<bind <_>> <bind <_>>]> <arr [<bind <_>> <bind <_>>]>]>}>"
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when T is Pattern:
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raiseAssert "? for pattern"
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elif T is ref:
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?pointerBase(T)
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elif T is array:
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var arr = DCompoundArr(items: newSeq[Pattern](len(T)))
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for p in arr.items.mitems: p = grab()
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result = ?arr
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elif T.hasPreservesRecordPragma:
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var
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label = T.recordLabel.tosymbol(Ref)
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fields = newSeq[Pattern]()
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for key, val in fieldPairs(default T):
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when typeOf(val) is Pattern:
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fields.add drop()
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else:
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fields.add ?(typeOf val)
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result = ?DCompound(
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orKind: DCompoundKind.rec,
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rec: DCompoundRec(
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label: label, fields: fields))
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elif T.hasPreservesDictionaryPragma:
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var dict = DCompoundDict()
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for key, val in fieldPairs(default T):
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dict.entries[key.toSymbol(Ref)] = ?(typeOf val)
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?DCompound(
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orKind: DCompoundKind.dict,
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dict: dict)
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elif T.hasPreservesTuplePragma or T is tuple:
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raiseAssert "got a tuple"
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var arr = DCompoundArr()
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for key, val in fieldPairs(default T):
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arr.items.add ?(typeOf val)
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?DCompound(
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orKind: DCompoundKind.arr,
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arr: arr)
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else:
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grab() # otherwise an abritrary capture
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proc fieldCount(T: typedesc): int =
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for _, _ in fieldPairs(default T):
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inc result
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proc `?`*(T: static typedesc; bindings: sink openArray[(int, Pattern)]): Pattern =
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## Construct a `Pattern` from type `T` that selectively captures fields.
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runnableExamples:
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import preserves
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type Point = tuple[x: int; y: int; z: int]
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assert $(Point ? { 2: grab() }) == "<arr [<_> <_> <bind <_>>]>"
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when T is ref:
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`?`(pointerBase(T), bindings)
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elif T.hasPreservesRecordPragma:
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var
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label = T.recordLabel.tosymbol(Ref)
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fields = newSeq[Pattern](fieldCount T)
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for (i, pat) in bindings:
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fields[i] = pat
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for pat in fields.mitems:
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if pat.isNil: pat = drop()
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result = ?DCompound(
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orKind: DCompoundKind.rec,
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rec: DCompoundRec(
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label: label, fields: fields))
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elif T is tuple:
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var arr = DCompoundArr()
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for (i, pat) in bindings:
|
||||
if i > arr.items.high: arr.items.setLen(succ i)
|
||||
arr.items[i] = pat
|
||||
for pat in arr.items.mitems:
|
||||
if pat.isNil: pat = drop()
|
||||
result = ?DCompound(
|
||||
orKind: DCompoundKind.arr,
|
||||
arr: arr)
|
||||
else:
|
||||
raiseAssert("no preserves pragma on " & $T)
|
||||
|
||||
#[
|
||||
proc `?`*(pat: sink Pattern; bindings: sink openArray[(int, Pattern)]): Pattern =
|
||||
## Construct a `Pattern` from `pat` with overrides from `bindings`.
|
||||
result = pat
|
||||
assert not result.isNil
|
||||
case result.orKind
|
||||
of PatternKind.DDiscard, PatternKind.DBind: discard
|
||||
of PatternKind.DCompound:
|
||||
case result.dcompound.orKind
|
||||
|
||||
of `rec`:
|
||||
echo "need to override record fields ", result.dcompound.rec.fields, " with ", bindings
|
||||
var foo = result.dcompound.rec.fields[1] ? bindings
|
||||
echo "recursing into fields returned ", foo
|
||||
result.dcompound.rec.fields[1] = foo
|
||||
|
||||
|
||||
of `arr`:
|
||||
echo "need to override array items ", result.dcompound.arr.items, " with ", bindings
|
||||
for i in result.dcompound.arr.items.mitems:
|
||||
i = drop()
|
||||
for (i, pat) in bindings:
|
||||
result.dcompound.arr.items[i] = pat
|
||||
|
||||
else:
|
||||
raiseAssert $result.dcompound.orKind
|
||||
else:
|
||||
raiseAssert $result.orKind
|
||||
]#
|
||||
|
||||
proc `??`*(pat: sink Pattern; bindings: sink openArray[(int, Pattern)]): Pattern =
|
||||
## Create a `Pattern` that matches or captures from a `Pattern` over `pat`.
|
||||
runnableExamples:
|
||||
import preserves
|
||||
|
||||
type Point* {.preservesRecord: "point".} = object
|
||||
x, y: int
|
||||
|
||||
assert $(?Point) == "<rec point [<bind <_>> <bind <_>>]>"
|
||||
# Capture two values from a value of `Point`.
|
||||
|
||||
assert $(?Point ?? { 0: ?DLit }) == "<rec rec [<lit point> <arr [<rec lit [<bind <_>>]> <_>]>]>"
|
||||
# Match a pattern of `Point` with a literal value set in the first field and capture that value.
|
||||
|
||||
assert $(?tuple[x: int, y: int] ?? { 1: ?DLit }) == "<rec arr [<arr [<_> <rec lit [<bind <_>>]>]>]>"
|
||||
# Match a pattern over a tuple with a literal value set in the second field and capture that value.
|
||||
|
||||
case pat.orKind
|
||||
of PatternKind.DCompound:
|
||||
case pat.dcompound.orKind:
|
||||
|
||||
of DCompoundKind.rec:
|
||||
let fieldsLen = pat.dcompound.rec.fields.len
|
||||
pat.dcompound.rec.fields.setLen 0
|
||||
result = ?pat
|
||||
result.dcompound.rec.fields[1].dcompound.arr.items.setLen fieldsLen
|
||||
for (i, p) in bindings:
|
||||
result.dcompound.rec.fields[1].dcompound.arr.items[i] = p
|
||||
for e in result.dcompound.rec.fields[1].dcompound.arr.items.mitems:
|
||||
if e.isNil: e = drop()
|
||||
|
||||
of DCompoundKind.arr:
|
||||
let itemsLen = pat.dcompound.arr.items.len
|
||||
pat.dcompound.arr.items.setLen 0
|
||||
result = ?pat
|
||||
echo "override ", result.dcompound.rec.fields[0].dcompound.arr.items
|
||||
result.dcompound.rec.fields[0].dcompound.arr.items.setLen itemsLen
|
||||
for (i, p) in bindings:
|
||||
result.dcompound.rec.fields[0].dcompound.arr.items[i] = p
|
||||
for e in result.dcompound.rec.fields[0].dcompound.arr.items.mitems:
|
||||
if e.isNil: e = drop()
|
||||
|
||||
of DCompoundKind.dict:
|
||||
let keys = pat.dcompound.dict.entries.keys.toSeq
|
||||
clear pat.dcompound.dict.entries
|
||||
result = ?pat
|
||||
|
||||
else:
|
||||
raiseAssert "cannot override " & $pat
|
||||
|
||||
proc recordPattern*(label: Preserve[Ref], fields: varargs[Pattern]): Pattern =
|
||||
?DCompoundRec(label: label, fields: fields.toSeq)
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue