Add a Swift backend for LibertyXDR
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GPG Key ID:
A0420B94F92B9493
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@ -72,7 +72,7 @@ add_test (test-cmake-parser
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# Test protocol code generation
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set (lxdrgen_outputs)
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set (lxdrgen_base "${PROJECT_BINARY_DIR}/lxdrgen.lxdr")
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foreach (backend c go mjs)
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foreach (backend c go mjs swift)
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list (APPEND lxdrgen_outputs ${lxdrgen_base}.${backend})
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add_custom_command (OUTPUT ${lxdrgen_base}.${backend}
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COMMAND env LC_ALL=C awk
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@ -108,3 +108,11 @@ if (NODE_EXECUTABLE)
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else ()
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message (WARNING "Cannot test generated protocol code for Javascript")
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endif ()
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find_program (SWIFTC_EXECUTABLE swiftc)
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if (SWIFTC_EXECUTABLE)
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add_test (test-lxdrgen-swift
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${SWIFTC_EXECUTABLE} -typecheck ${lxdrgen_base}.swift)
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else ()
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message (WARNING "Cannot test generated protocol code for Swift")
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endif ()
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@ -54,6 +54,9 @@ lxdrgen-mjs.awk::
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LibertyXDR backend for Javascript, currently for decoding only.
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It cuts a corner by not using BigInts, on par with `JSON.parse()`.
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lxdrgen-swift.awk::
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LibertyXDR backend for the Swift programming language.
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Contributing and Support
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------------------------
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Use https://git.janouch.name/p/liberty to report any bugs, request features,
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@ -441,7 +441,7 @@ function codegen_struct(name, cg, gotype) {
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function codegen_union_tag(d, cg) {
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cg["tagtype"] = d["type"]
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cg["tagname"] = d["name"]
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cg["tagname"] = snaketocamel(d["name"])
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# The tag is implied from the type of struct stored in the interface.
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}
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@ -450,8 +450,8 @@ function codegen_union_struct(name, casename, cg, scg, structname, init) {
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structname = name snaketocamel(casename)
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codegen_struct(structname, scg)
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init = CodegenGoType[structname] "{" snaketocamel(cg["tagname"]) \
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": " decapitalize(snaketocamel(cg["tagname"])) "}"
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init = CodegenGoType[structname] "{" cg["tagname"] \
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": " decapitalize(cg["tagname"]) "}"
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append(cg, "unmarshal",
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"\tcase " CodegenGoType[cg["tagtype"]] snaketocamel(casename) ":\n" \
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"\t\ts := " init "\n" \
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@ -467,7 +467,7 @@ function codegen_union_struct(name, casename, cg, scg, structname, init) {
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"\t\tu.Interface = &s\n")
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}
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function codegen_union(name, cg, gotype, tagfield, tagvar) {
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function codegen_union(name, cg, gotype, tagvar) {
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gotype = PrefixCamel name
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print "type " gotype " struct {"
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print "\tInterface any"
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@ -481,18 +481,17 @@ function codegen_union(name, cg, gotype, tagfield, tagvar) {
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print "}"
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print ""
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tagfield = snaketocamel(cg["tagname"])
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tagvar = decapitalize(tagfield)
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tagvar = decapitalize(cg["tagname"])
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print "func (u *" gotype ") UnmarshalJSON(data []byte) (err error) {"
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print "\tvar t struct {"
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print "\t\t" tagfield " " CodegenGoType[cg["tagtype"]] \
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print "\t\t" cg["tagname"] " " CodegenGoType[cg["tagtype"]] \
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" `json:\"" tagvar "\"`"
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print "\t}"
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print "\tif err := json.Unmarshal(data, &t); err != nil {"
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print "\t\treturn err"
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print "\t}"
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print ""
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print "\tswitch " tagvar " := t." tagfield "; " tagvar " {"
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print "\tswitch " tagvar " := t." cg["tagname"] "; " tagvar " {"
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print cg["unmarshal"] "\tdefault:"
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print "\t\terr = errors.New(`unsupported value: ` + " tagvar ".String())"
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print "\t}"
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@ -185,14 +185,14 @@ function codegen_struct(name, cg) {
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function codegen_union_tag(d, cg) {
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cg["tagtype"] = d["type"]
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cg["tagname"] = d["name"]
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cg["tagname"] = decapitalize(snaketocamel(d["name"]))
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}
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function codegen_union_struct(name, casename, cg, scg, structname) {
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append(scg, "methods",
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"\n" \
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"\tconstructor() {\n" \
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"\t\tthis." decapitalize(snaketocamel(cg["tagname"])) \
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"\t\tthis." cg["tagname"] \
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" = " cg["tagtype"] "." snaketocamel(casename) "\n" \
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"\t}\n")
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@ -209,7 +209,7 @@ function codegen_union_struct(name, casename, cg, scg, structname) {
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}
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function codegen_union(name, cg, tagvar) {
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tagvar = decapitalize(snaketocamel(cg["tagname"]))
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tagvar = cg["tagname"]
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print ""
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print "export function deserialize" name "(r) {"
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@ -0,0 +1,276 @@
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# lxdrgen-swift.awk: Swift backend for lxdrgen.awk.
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#
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# Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
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# SPDX-License-Identifier: 0BSD
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function define_internal(name, swifttype) {
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Types[name] = "internal"
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CodegenSwiftType[name] = swifttype
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CodegenDeserialize[name] = "%s.read()"
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}
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function define_sint(size, shortname, swifttype) {
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shortname = "i" size
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swifttype = "Int" size
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define_internal(shortname, swifttype)
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}
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function define_uint(size, shortname, swifttype) {
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shortname = "u" size
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swifttype = "UInt" size
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define_internal(shortname, swifttype)
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}
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function codegen_begin() {
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define_sint("8")
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define_sint("16")
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define_sint("32")
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define_sint("64")
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define_uint("8")
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define_uint("16")
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define_uint("32")
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define_uint("64")
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define_internal("bool", "Bool")
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define_internal("string", "String")
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print "// Code generated from " FILENAME ". DO NOT EDIT."
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print "import Foundation"
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print ""
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print "public struct RelayReader {"
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print "\tpublic var data: Data"
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print ""
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print "\tpublic enum ReadError: Error {"
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print "\t\tcase unexpectedEOF"
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print "\t\tcase invalidEncoding"
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print "\t\tcase overflow"
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print "\t\tcase unexpectedValue"
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print "\t}"
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print ""
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print "\tpublic mutating func read<T: FixedWidthInteger>() throws -> T {"
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print "\t\tlet size = MemoryLayout<T>.size"
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print "\t\tguard data.count >= size else {"
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print "\t\t\tthrow ReadError.unexpectedEOF"
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print "\t\t}"
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print "\t\tvar acc: T = 0"
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print "\t\tdata.prefix(size).forEach { acc = acc << 8 | T($0) }"
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print "\t\tdata = data.dropFirst(size)"
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print "\t\treturn acc"
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print "\t}"
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print ""
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print "\tpublic mutating func read() throws -> Bool {"
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print "\t\ttry read() != UInt8(0)"
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print "\t}"
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print ""
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print "\tpublic mutating func read() throws -> String {"
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print "\t\tlet size: UInt32 = try self.read()"
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print "\t\tguard let count = Int(exactly: size) else {"
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print "\t\t\tthrow ReadError.overflow"
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print "\t\t}"
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print "\t\tguard data.count >= count else {"
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print "\t\t\tthrow ReadError.unexpectedEOF"
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print "\t\t}"
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print "\t\tdefer {"
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print "\t\t\tdata = data.dropFirst(count)"
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print "\t\t}"
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print "\t\tif let s = String(data: data.prefix(count), encoding: .utf8) {"
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print "\t\t\treturn s"
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print "\t\t} else {"
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print "\t\t\tthrow ReadError.invalidEncoding"
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print "\t\t}"
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print "\t}"
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print ""
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print "\tpublic mutating func read<" \
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"T: RawRepresentable<Int8>>() throws -> T {"
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print "\t\tguard let value = T(rawValue: try read()) else {"
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print "\t\t\tthrow ReadError.unexpectedValue"
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print "\t\t}"
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print "\t\treturn value"
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print "\t}"
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print ""
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print "\tpublic mutating func read<T>("
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print "\t\t\t_ read: (inout Self) throws -> T) throws -> [T] {"
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print "\t\tlet size: UInt32 = try self.read()"
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print "\t\tguard let count = Int(exactly: size) else {"
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print "\t\t\tthrow ReadError.overflow"
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print "\t\t}"
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print "\t\tvar array = [T]()"
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print "\t\tarray.reserveCapacity(count)"
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print "\t\tfor _ in 0..<count {"
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print "\t\t\tarray.append(try read(&self))"
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print "\t\t}"
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print "\t\treturn array"
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print "\t}"
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print "}"
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print ""
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print "public struct RelayWriter {"
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print "\tpublic var data = Data()"
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print ""
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print "\tpublic mutating func append<T: FixedWidthInteger>(_ number: T) {"
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print "\t\tvar n = number.byteSwapped"
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print "\t\tfor _ in 0..<MemoryLayout<T>.size {"
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print "\t\t\tdata.append(UInt8(truncatingIfNeeded: n))"
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print "\t\t\tn >>= 8"
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print "\t\t}"
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print "\t}"
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print ""
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print "\tpublic mutating func append(_ bool: Bool) {"
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print "\t\tappend(UInt8(bool ? 1 : 0))"
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print "\t}"
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print ""
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print "\tpublic mutating func append(_ string: String) {"
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print "\t\tlet bytes = string.data(using: .utf8)!"
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print "\t\tappend(UInt32(bytes.count))"
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print "\t\tdata.append(bytes)"
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print "\t}"
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print ""
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print "\tpublic mutating func append<" \
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"T: RawRepresentable<Int8>>(_ value: T) {"
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print "\t\tappend(value.rawValue)"
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print "\t}"
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print ""
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print "\tpublic mutating func append<T>("
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print "\t\t\t_ array: Array<T>, _ write: (inout Self, T) -> ()) {"
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print "\t\tappend(UInt32(array.count))"
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print "\t\tfor i in 0..<array.count {"
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print "\t\t\twrite(&self, array[i])"
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print "\t\t}"
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print "\t}"
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print ""
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print "\tpublic mutating func append<T: RelayEncodable>(_ value: T) {"
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print "\t\tvalue.encode(to: &self)"
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print "\t}"
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print "}"
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print ""
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print "public protocol RelayEncodable { " \
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"func encode(to: inout RelayWriter) }"
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}
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function codegen_constant(name, value) {
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print ""
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print "public let " decapitalize(PrefixCamel snaketocamel(name)) " = " value
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}
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function codegen_enum_value(name, subname, value, cg) {
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append(cg, "fields",
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"\tcase " decapitalize(snaketocamel(subname)) " = " value "\n")
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}
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function codegen_enum(name, cg, swifttype) {
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swifttype = PrefixCamel name
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print ""
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print "public enum " swifttype ": Int8 {"
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print cg["fields"] "}"
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CodegenSwiftType[name] = swifttype
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CodegenDeserialize[name] = "%s.read()"
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for (i in cg)
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delete cg[i]
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}
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function codegen_struct_field(d, cg, camel) {
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camel = decapitalize(snaketocamel(d["name"]))
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if (!d["isarray"]) {
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append(cg, "fields",
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"\tpublic var " camel ": " CodegenSwiftType[d["type"]] "\n")
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append(cg, "deserialize",
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"\t\tself." camel " = try " \
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sprintf(CodegenDeserialize[d["type"]], "from") "\n")
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append(cg, "serialize",
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"\t\tto.append(self." camel ")\n")
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return
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}
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append(cg, "fields",
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"\tpublic var " camel ": [" CodegenSwiftType[d["type"]] "]\n")
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append(cg, "deserialize",
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"\t\tself." camel " = try from.read() { r in try " \
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sprintf(CodegenDeserialize[d["type"]], "r") " }\n")
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append(cg, "serialize",
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"\t\tto.append(self." camel ") { (w, value) in w.append(value) }\n")
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}
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function codegen_struct_tag(d, cg, camel) {
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camel = decapitalize(snaketocamel(d["name"]))
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append(cg, "serialize",
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"\t\tto.append(self." camel ")\n")
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}
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function codegen_struct(name, cg, swifttype) {
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swifttype = PrefixCamel name
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print ""
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print "public struct " swifttype " {\n" cg["fields"] "}"
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print ""
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print "extension " swifttype ": " PrefixCamel "Encodable {"
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print "\tpublic init(from: inout RelayReader) throws {"
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print cg["deserialize"] "\t}"
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print ""
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print "\tpublic func encode(to: inout RelayWriter) {"
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print cg["serialize"] "\t}"
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print "}"
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CodegenSwiftType[name] = swifttype
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CodegenDeserialize[name] = "%s.read()"
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for (i in cg)
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delete cg[i]
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}
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function codegen_union_tag(d, cg) {
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cg["tagtype"] = d["type"]
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cg["tagname"] = decapitalize(snaketocamel(d["name"]))
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}
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function codegen_union_struct(name, casename, cg, scg, swifttype) {
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# And thus not all generated structs are present in Types.
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swifttype = PrefixCamel name snaketocamel(casename)
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casename = decapitalize(snaketocamel(casename))
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print ""
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print "public struct " swifttype ": " PrefixCamel name " {"
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print "\tpublic var " cg["tagname"] \
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": " CodegenSwiftType[cg["tagtype"]] " { ." casename " }"
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print scg["fields"] "}"
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print ""
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print "extension " swifttype ": " PrefixCamel "Encodable {"
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print "\tfileprivate init(from: inout RelayReader) throws {"
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print scg["deserialize"] "\t}"
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print ""
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print "\tpublic func encode(to: inout RelayWriter) {"
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print scg["serialize"] "\t}"
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print "}"
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append(cg, "cases", "\tcase ." casename ":\n" \
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"\t\treturn try " swifttype "(from: &from)\n")
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CodegenSwiftType[name] = swifttype
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CodegenDeserialize[name] = "%s.read()"
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for (i in scg)
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delete scg[i]
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}
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function codegen_union(name, cg, swifttype, init) {
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# Classes don't have automatic member-wise initializers,
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# thus using structs and protocols.
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swifttype = PrefixCamel name
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print ""
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print "public protocol " swifttype ": " PrefixCamel "Encodable {"
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print "\tvar " cg["tagname"] ": " CodegenSwiftType[cg["tagtype"]] " { get }"
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print "}"
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init = decapitalize(swifttype)
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print ""
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print "public func " init \
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"(from: inout RelayReader) throws -> " swifttype " {"
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print "\tlet " cg["tagname"] ": " CodegenSwiftType[cg["tagtype"]] \
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" = try from.read()"
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print "\tswitch " cg["tagname"] " {"
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# TODO: Only generate the default if there are remaining values,
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# so that swiftc doesn't produce warnings.
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print cg["cases"] "\tdefault:"
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print "\t\tthrow RelayReader.ReadError.unexpectedValue"
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print"\t}"
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print "}"
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CodegenSwiftType[name] = swifttype
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CodegenDeserialize[name] = init "(from: &%s)"
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for (i in cg)
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delete cg[i]
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}
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