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|
struct ModuleTranslation {
let diagnostics: DiagnosticCollection
let typeMapping: TypeMapping
var builder: WITBuilder
mutating func translate(sourceSummary: SwiftSourceSummary) {
for (_, typeSource) in sourceSummary.typesByWITName {
translateType(source: typeSource)
}
for (_, functionSource) in sourceSummary.functionsByWITName {
translateFunction(source: functionSource)
}
}
mutating func translateType(source: SwiftTypeSource) {
switch source {
case .structType(let source):
translateStruct(source: source)
case .enumType(let source):
translateEnum(source: source)
}
}
mutating func translateStruct(source: SwiftStructSource) {
guard let witTypeName = typeMapping.lookupWITType(byUsr: source.usr) else {
return
}
var fields: [WITRecord.Field] = []
for field in source.fields {
let fieldName = ConvertCase.witIdentifier(identifier: field.name)
guard let fieldWITType = typeMapping.lookupWITType(byNode: field.type, diagnostics: diagnostics) else {
diagnostics.add(
.skipField(
context: source.node.parent.printedName,
field: field.name,
missingType: field.type.parent.parent.printedName
)
)
continue
}
fields.append(WITRecord.Field(name: fieldName, type: fieldWITType))
}
builder.define(
record: WITRecord(name: witTypeName, fields: fields)
)
}
mutating func translateEnum(source: SwiftEnumSource) {
guard let witTypeName = typeMapping.lookupWITType(byUsr: source.usr) else {
return
}
var cases: [(name: String, type: String?)] = []
var hasPayload = false
for enumCase in source.cases {
let caseName = ConvertCase.witIdentifier(identifier: enumCase.name)
var payloadWITType: String?
if let payloadTypeNode = enumCase.payloadType {
hasPayload = true
payloadWITType = typeMapping.lookupWITType(byNode: payloadTypeNode, diagnostics: diagnostics)
if payloadWITType == nil {
diagnostics.add(
.skipField(
context: source.node.parent.printedName,
field: enumCase.name,
missingType: payloadTypeNode.parent.parent.printedName
)
)
}
}
cases.append((caseName, payloadWITType))
}
// If the given Swift enum has at least one case with payload, turn it into variant,
// otherwise optimize to be enum.
if hasPayload {
builder.define(variant: WITVariant(name: witTypeName, cases: cases.map { WITVariant.Case(name: $0, type: $1) }))
} else {
builder.define(enum: WITEnum(name: witTypeName, cases: cases.map { name, _ in name }))
}
}
mutating func translateFunction(source: SwiftFunctionSource) {
let witName = ConvertCase.witIdentifier(identifier: source.name)
let witResultTypeNames = source.results.compactMap { result -> String? in
guard let singleResult = typeMapping.lookupWITType(byNode: result.type, diagnostics: diagnostics) else {
diagnostics.add(
.skipField(
context: source.name,
field: "result",
missingType: result.type.parent.parent.printedName
)
)
return nil
}
return singleResult
}
guard witResultTypeNames.count == source.results.count else {
// Skip emitting if there is any missing WIT type
return
}
let witResults: WITFunction.Results
switch source.results.count {
case 0:
witResults = .named([])
case 1:
witResults = .anon(witResultTypeNames[0])
default:
var resultNames = AlphabeticalIterator()
witResults = .named(
zip(source.results, witResultTypeNames).map { source, witType in
WITFunction.Parameter(name: source.name ?? resultNames.next(), type: witType)
})
}
var parameterNames = AlphabeticalIterator()
let witParameters = source.parameters.compactMap { param -> WITFunction.Parameter? in
let name = parameterNames.next()
guard let type = typeMapping.lookupWITType(byNode: param.type, diagnostics: diagnostics) else {
diagnostics.add(
.skipField(
context: source.name,
field: param.name ?? "parameter",
missingType: param.type.parent.parent.printedName
)
)
return nil
}
return WITFunction.Parameter(name: name, type: type)
}
guard witParameters.count == source.parameters.count else {
// Skip emitting if there is any missing WIT type
return
}
builder.define(
function: WITFunction(
name: witName,
parameters: witParameters,
results: witResults
)
)
}
}
private struct AlphabeticalIterator {
var index: Int = 0
mutating func next() -> String {
let chars = Array("abcdefghijklmnopqrstuvwxyz")
var buffer: [Character] = []
var tmpIndex = index
while tmpIndex >= chars.count {
buffer.append(chars[tmpIndex % chars.count])
tmpIndex /= chars.count
tmpIndex -= 1
}
buffer.append(chars[tmpIndex])
index += 1
return String(buffer)
}
}
|
