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import WIT
protocol StaticCanonicalLifting: CanonicalLifting where Operand == StaticMetaOperand {
var printer: SourcePrinter { get }
var builder: SwiftFunctionBuilder { get }
var definitionMapping: DefinitionMapping { get }
func liftUInt(_ value: Operand, bitWidth: Int) -> Operand
func liftInt(_ value: Operand, bitWidth: Int) -> Operand
func liftPointer(_ value: Operand, pointeeTypeName: String) -> Operand
func liftBufferPointer(_ value: Operand, length: Operand) -> Operand
}
extension StaticCanonicalLifting {
func liftBool(_ value: Operand) -> Operand {
.call("Bool", arguments: [.literal("\(value) != 0")])
}
private func liftFloat(_ value: Operand, bitWidth: Int) -> Operand {
.call("Float\(bitWidth)", arguments: [value])
}
func liftUInt8(_ value: Operand) -> Operand { liftUInt(value, bitWidth: 8) }
func liftUInt16(_ value: Operand) -> Operand { liftUInt(value, bitWidth: 16) }
func liftUInt32(_ value: Operand) -> Operand { liftUInt(value, bitWidth: 32) }
func liftUInt64(_ value: Operand) -> Operand { liftUInt(value, bitWidth: 64) }
func liftInt8(_ value: Operand) -> Operand { liftInt(value, bitWidth: 8) }
func liftInt16(_ value: Operand) -> Operand { liftInt(value, bitWidth: 16) }
func liftInt32(_ value: Operand) -> Operand { liftInt(value, bitWidth: 32) }
func liftInt64(_ value: Operand) -> Operand { liftInt(value, bitWidth: 64) }
func liftFloat32(_ value: Operand) -> Operand { liftFloat(value, bitWidth: 32) }
func liftFloat64(_ value: Operand) -> Operand { liftFloat(value, bitWidth: 64) }
func liftChar(_ value: Operand) -> Operand {
.forceUnwrap(.call("Unicode.Scalar", arguments: [liftUInt32(value)]))
}
func liftString(pointer: Operand, length: Operand, encoding: String) throws -> Operand {
.call(
"String",
arguments: [
("decoding", liftBufferPointer(liftPointer(pointer, pointeeTypeName: "UInt8"), length: length)),
("as", .literal("UTF8.self")),
])
}
func liftRecord(fields: [Operand], type: WITRecord) throws -> Operand {
let arguments = zip(fields, type.fields).map { operand, field in
(ConvertCase.camelCase(kebab: field.name), operand)
}
let swiftTypeName = try definitionMapping.lookupSwiftName(record: type)
return .call(swiftTypeName, arguments: arguments)
}
func liftTuple(elements: [Operand], types: [WITType]) throws -> Operand {
return .literal("(" + elements.map(\.description).joined(separator: ", ") + ")")
}
func liftEnum(_ value: Operand, type: WITEnum) throws -> Operand {
let discriminantType = CanonicalABI.discriminantType(numberOfCases: UInt32(type.cases.count))
let swiftTypeName = try definitionMapping.lookupSwiftName(enum: type)
return .forceUnwrap(
.call(
swiftTypeName,
arguments: [
(
"rawValue", .call(discriminantType.swiftTypeName, arguments: [value])
)
]
)
)
}
func liftFlags(_ value: [Operand], type: WITFlags) throws -> Operand {
let rawValue: Operand
let swiftTypeName = try definitionMapping.lookupSwiftName(flags: type)
switch CanonicalABI.rawType(ofFlags: type.flags.count) {
case .u8: rawValue = liftUInt8(value[0])
case .u16: rawValue = liftUInt16(value[0])
case .u32:
let u32Values = value.map { liftUInt32($0) }
if u32Values.count == 1 {
rawValue = u32Values[0]
} else {
// Build \(type).RawValue struct from raw values.
rawValue = .call("\(swiftTypeName).RawValue", arguments: u32Values)
}
}
return .call(swiftTypeName, arguments: [("rawValue", rawValue)])
}
func liftOption(discriminant: Operand, wrapped: WITType, liftPayload: () throws -> Operand) throws -> Operand {
try liftVariantLike(
discriminant: discriminant,
swiftCaseNames: ["none", "some"],
swiftTypeName: WITType.option(wrapped).qualifiedSwiftName(
mapping: definitionMapping
),
liftPayload: {
caseIndex in
if caseIndex == 1 {
return try liftPayload()
} else {
return nil
}
}
)
}
func liftResult(discriminant: Operand, ok: WITType?, error: WITType?, liftPayload: (Bool) throws -> Operand?) throws -> Operand {
try liftVariantLike(
discriminant: discriminant,
swiftCaseNames: ["success", "failure"],
swiftTypeName: WITType.result(ok: ok, error: error).qualifiedSwiftName(
mapping: definitionMapping
),
liftPayload: {
caseIndex in
// Put `Void` value even the case doesn't have payload because
// Swift's `Result` type always expect a paylaod for both cases.
let isFailure = caseIndex == 1
let lifted = try liftPayload(isFailure) ?? .literal("()")
// Wrap with `ComponentError` because not all types used in error conform `Error`
return isFailure ? .call("ComponentError", arguments: [lifted]) : lifted
}
)
}
func liftVariant(discriminant: Operand, type: WITVariant, liftPayload: (Int) throws -> Operand?) throws -> Operand {
try liftVariantLike(
discriminant: discriminant,
swiftCaseNames: type.cases.map { SwiftName.makeName(kebab: $0.name) },
swiftTypeName: definitionMapping.lookupSwiftName(variant: type),
liftPayload: liftPayload
)
}
func liftVariantLike(
discriminant: Operand,
swiftCaseNames: [String], swiftTypeName: String,
liftPayload: (Int) throws -> Operand?
) throws -> Operand {
let loadedVar = builder.variable("variantLifted")
printer.write(line: "let \(loadedVar): \(swiftTypeName)")
printer.write(line: "switch \(discriminant) {")
for (i, variantCaseName) in swiftCaseNames.enumerated() {
printer.write(line: "case \(i):")
try printer.indent {
let caseName = variantCaseName
if let liftedPayload = try liftPayload(i) {
printer.write(line: "\(loadedVar) = .\(caseName)(\(liftedPayload))")
} else {
printer.write(line: "\(loadedVar) = .\(caseName)")
}
}
}
printer.write(line: "default: fatalError(\"invalid variant discriminant\")")
printer.write(line: "}")
return .variable(loadedVar)
}
}
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