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extension TypeReprSyntax {
static func parse(lexer: inout Lexer) throws -> TypeReprSyntax {
guard let token = lexer.next() else {
throw ParseError(description: "a type expected")
}
switch token.kind {
case .bool: return .bool
case .u8: return .u8
case .u16: return .u16
case .u32: return .u32
case .u64: return .u64
case .s8: return .s8
case .s16: return .s16
case .s32: return .s32
case .s64: return .s64
case .float32: return .float32
case .float64: return .float64
case .char: return .char
case .string_: return .string
// tuple<T, U, ...>
case .tuple:
let types = try Parser.parseList(
lexer: &lexer, start: .lessThan, end: .greaterThan
) { try TypeReprSyntax.parse(lexer: &$1) }
return .tuple(types)
// list<T>
case .list:
try lexer.expect(.lessThan)
let type = try TypeReprSyntax.parse(lexer: &lexer)
try lexer.expect(.greaterThan)
return .list(type)
// option<T>
case .option_:
try lexer.expect(.lessThan)
let type = try TypeReprSyntax.parse(lexer: &lexer)
try lexer.expect(.greaterThan)
return .option(type)
// result<T, E>
// result<_, E>
// result<T>
// result
case .result_:
var ok: TypeReprSyntax?
var error: TypeReprSyntax?
if lexer.eat(.lessThan) {
if lexer.eat(.underscore) {
try lexer.expect(.comma)
error = try TypeReprSyntax.parse(lexer: &lexer)
} else {
ok = try TypeReprSyntax.parse(lexer: &lexer)
if lexer.eat(.comma) {
error = try TypeReprSyntax.parse(lexer: &lexer)
}
}
try lexer.expect(.greaterThan)
}
return .result(ResultSyntax(ok: ok, error: error))
// future<T>
// future
case .future:
var type: TypeReprSyntax?
if lexer.eat(.lessThan) {
type = try TypeReprSyntax.parse(lexer: &lexer)
try lexer.expect(.greaterThan)
}
return .future(type)
// stream<T, Z>
// stream<_, Z>
// stream<T>
// stream
case .stream:
var element: TypeReprSyntax?
var end: TypeReprSyntax?
if lexer.eat(.lessThan) {
if lexer.eat(.underscore) {
try lexer.expect(.comma)
end = try TypeReprSyntax.parse(lexer: &lexer)
} else {
element = try TypeReprSyntax.parse(lexer: &lexer)
if lexer.eat(.comma) {
end = try TypeReprSyntax.parse(lexer: &lexer)
}
}
try lexer.expect(.greaterThan)
}
return .stream(StreamSyntax(element: element, end: end))
// own<T>
case .own:
try lexer.expect(.lessThan)
let resource = try Identifier.parse(lexer: &lexer)
try lexer.expect(.greaterThan)
return .handle(.own(resource: resource))
// borrow<T>
case .borrow:
try lexer.expect(.lessThan)
let resource = try Identifier.parse(lexer: &lexer)
try lexer.expect(.greaterThan)
return .handle(.borrow(resource: resource))
// `foo`
case .id:
return .name(
Identifier(
text: lexer.parseText(in: token.textRange),
textRange: token.textRange
))
// `%foo`
case .explicitId:
return .name(
Identifier(
text: lexer.parseExplicitIdentifier(in: token.textRange),
textRange: token.textRange
))
case let tokenKind:
throw ParseError(description: "unknown type \(String(describing: tokenKind))")
}
}
}
extension TypeDefSyntax {
static func parse(lexer: inout Lexer, documents: DocumentsSyntax) throws -> TypeDefSyntax {
try lexer.expect(.type)
let name = try Identifier.parse(lexer: &lexer)
try lexer.expect(.equals)
let repr = try TypeReprSyntax.parse(lexer: &lexer)
return TypeDefSyntax(documents: documents, name: name, body: .alias(TypeAliasSyntax(typeRepr: repr)))
}
static func parseFlags(lexer: inout Lexer, documents: DocumentsSyntax) throws -> TypeDefSyntax {
try lexer.expect(.flags)
let name = try Identifier.parse(lexer: &lexer)
let body = try TypeDefBodySyntax.flags(
FlagsSyntax(
flags: Parser.parseList(
lexer: &lexer,
start: .leftBrace, end: .rightBrace
) { docs, lexer in
let name = try Identifier.parse(lexer: &lexer)
return FlagSyntax(documents: docs, name: name)
}
))
return TypeDefSyntax(documents: documents, name: name, body: body)
}
static func parseResource(lexer: inout Lexer, documents: DocumentsSyntax) throws -> SyntaxNode<TypeDefSyntax> {
try lexer.expect(.resource)
let name = try Identifier.parse(lexer: &lexer)
var functions: [ResourceFunctionSyntax] = []
if lexer.eat(.leftBrace) {
while !lexer.eat(.rightBrace) {
let docs = try DocumentsSyntax.parse(lexer: &lexer)
functions.append(try ResourceFunctionSyntax.parse(lexer: &lexer, documents: docs))
}
}
let body = TypeDefBodySyntax.resource(ResourceSyntax(functions: functions))
return .init(syntax: TypeDefSyntax(documents: documents, name: name, body: body))
}
static func parseRecord(lexer: inout Lexer, documents: DocumentsSyntax) throws -> TypeDefSyntax {
try lexer.expect(.record)
let name = try Identifier.parse(lexer: &lexer)
let body = try TypeDefBodySyntax.record(
RecordSyntax(
fields: Parser.parseList(
lexer: &lexer,
start: .leftBrace, end: .rightBrace
) { docs, lexer in
let start = lexer.cursor.nextIndex
let name = try Identifier.parse(lexer: &lexer)
try lexer.expect(.colon)
let type = try TypeReprSyntax.parse(lexer: &lexer)
return FieldSyntax(documents: docs, name: name, type: type, textRange: start..<lexer.cursor.nextIndex)
}
))
return TypeDefSyntax(documents: documents, name: name, body: body)
}
static func parseVariant(lexer: inout Lexer, documents: DocumentsSyntax) throws -> TypeDefSyntax {
try lexer.expect(.variant)
let name = try Identifier.parse(lexer: &lexer)
let body = try TypeDefBodySyntax.variant(
VariantSyntax(
cases: Parser.parseList(
lexer: &lexer,
start: .leftBrace, end: .rightBrace
) { docs, lexer in
let start = lexer.cursor.nextIndex
let name = try Identifier.parse(lexer: &lexer)
var payloadType: TypeReprSyntax?
if lexer.eat(.leftParen) {
payloadType = try TypeReprSyntax.parse(lexer: &lexer)
try lexer.expect(.rightParen)
}
return CaseSyntax(documents: docs, name: name, type: payloadType, textRange: start..<lexer.cursor.nextIndex)
},
textRange: name.textRange
))
return TypeDefSyntax(documents: documents, name: name, body: body)
}
static func parseUnion(lexer: inout Lexer, documents: DocumentsSyntax) throws -> TypeDefSyntax {
try lexer.expect(.union)
let name = try Identifier.parse(lexer: &lexer)
let body = try TypeDefBodySyntax.union(
UnionSyntax(
cases: Parser.parseList(
lexer: &lexer,
start: .leftBrace, end: .rightBrace
) { docs, lexer in
let start = lexer.cursor.nextIndex
let type = try TypeReprSyntax.parse(lexer: &lexer)
return UnionCaseSyntax(documents: docs, type: type, textRange: start..<lexer.cursor.nextIndex)
},
textRange: name.textRange
))
return TypeDefSyntax(documents: documents, name: name, body: body)
}
static func parseEnum(lexer: inout Lexer, documents: DocumentsSyntax) throws -> TypeDefSyntax {
try lexer.expect(.enum)
let name = try Identifier.parse(lexer: &lexer)
let body = try TypeDefBodySyntax.enum(
EnumSyntax(
cases: Parser.parseList(
lexer: &lexer,
start: .leftBrace, end: .rightBrace
) { docs, lexer in
let start = lexer.cursor.nextIndex
let name = try Identifier.parse(lexer: &lexer)
return EnumCaseSyntax(documents: docs, name: name, textRange: start..<lexer.cursor.nextIndex)
},
textRange: name.textRange
))
return TypeDefSyntax(documents: documents, name: name, body: body)
}
}
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