Move protocol code generators to liberty

This part of the project is now more or less stable.

1 files changed, 0 insertions, 538 deletions

diff --git a/xC-gen-proto-go.awk b/xC-gen-proto-go.awk
deleted file mode 100644
index c0d6d48..0000000
--- a/xC-gen-proto-go.awk
+++ /dev/null
@@ -1,538 +0,0 @@
-# xC-gen-proto-go.awk: Go backend for xC-gen-proto.awk.
-#
-# Copyright (c) 2022, Přemysl Eric Janouch <p@janouch.name>
-# SPDX-License-Identifier: 0BSD
-#
-# This backend also enables proxying to other endpoints using JSON.
-
-function define_internal(name, gotype) {
-	Types[name] = "internal"
-	CodegenGoType[name] = gotype
-}
-
-function define_sint(size,    shortname, gotype) {
-	shortname = "i" size
-	gotype = "int" size
-	define_internal(shortname, gotype)
-
-	CodegenAppendJSON[shortname] = \
-		"\tb = strconv.AppendInt(b, int64(%s), 10)\n"
-	if (size == 8) {
-		CodegenSerialize[shortname] = "\tdata = append(data, uint8(%s))\n"
-		CodegenDeserialize[shortname] = \
-			"\tif len(data) >= 1 {\n" \
-			"\t\t%s, data = int8(data[0]), data[1:]\n" \
-			"\t} else {\n" \
-			"\t\treturn nil, false\n" \
-			"\t}\n"
-		return
-	}
-
-	CodegenSerialize[shortname] = \
-		"\tdata = binary.BigEndian.AppendUint" size "(data, uint" size "(%s))\n"
-	CodegenDeserialize[shortname] = \
-		"\tif len(data) >= " (size / 8) " {\n" \
-		"\t\t%s = " gotype "(binary.BigEndian.Uint" size "(data))\n" \
-		"\t\tdata = data[" (size / 8) ":]\n" \
-		"\t} else {\n" \
-		"\t\treturn nil, false\n" \
-		"\t}\n"
-}
-
-function define_uint(size,    shortname, gotype) {
-	# Both []byte and []uint8 luckily marshal as base64-encoded JSON strings,
-	# so there's no need to rename the type as an exception.
-	shortname = "u" size
-	gotype = "uint" size
-	define_internal(shortname, gotype)
-
-	CodegenAppendJSON[shortname] = \
-		"\tb = strconv.AppendUint(b, uint64(%s), 10)\n"
-	if (size == 8) {
-		CodegenSerialize[shortname] = "\tdata = append(data, %s)\n"
-		CodegenDeserialize[shortname] = \
-			"\tif len(data) >= 1 {\n" \
-			"\t\t%s, data = data[0], data[1:]\n" \
-			"\t} else {\n" \
-			"\t\treturn nil, false\n" \
-			"\t}\n"
-		return
-	}
-
-	CodegenSerialize[shortname] = \
-		"\tdata = binary.BigEndian.AppendUint" size "(data, %s)\n"
-	CodegenDeserialize[shortname] = \
-		"\tif len(data) >= " (size / 8) " {\n" \
-		"\t\t%s = binary.BigEndian.Uint" size "(data)\n" \
-		"\t\tdata = data[" (size / 8) ":]\n" \
-		"\t} else {\n" \
-		"\t\treturn nil, false\n" \
-		"\t}\n"
-}
-
-# Currently two outputs cannot coexist within the same package.
-function codegen_private(name) {
-	return "proto" name
-}
-
-function codegen_begin(    funcname) {
-	define_sint("8")
-	define_sint("16")
-	define_sint("32")
-	define_sint("64")
-	define_uint("8")
-	define_uint("16")
-	define_uint("32")
-	define_uint("64")
-	define_internal("bool", "bool")
-	define_internal("string", "string")
-
-	# Cater to "go generate", for what it's worth.
-	CodegenPackage = ENV["GOPACKAGE"]
-	if (!CodegenPackage)
-		CodegenPackage = "main"
-
-	print "// Code generated from " FILENAME ". DO NOT EDIT."
-	print ""
-	print "package " CodegenPackage
-	print ""
-	print "import ("
-	print "\t`encoding/base64`"
-	print "\t`encoding/binary`"
-	print "\t`encoding/json`"
-	print "\t`errors`"
-	print "\t`math`"
-	print "\t`strconv`"
-	print "\t`unicode/utf8`"
-	print ")"
-	print ""
-
-	CodegenAppendJSON["bool"] = \
-		"\tb = strconv.AppendBool(b, %s)\n"
-	CodegenSerialize["bool"] = \
-		"\tif %s {\n" \
-		"\t\tdata = append(data, 1)\n" \
-		"\t} else {\n" \
-		"\t\tdata = append(data, 0)\n" \
-		"\t}\n"
-
-	funcname = codegen_private("ConsumeBoolFrom")
-	print "// " funcname " tries to deserialize a boolean value"
-	print "// from the beginning of a byte stream. When successful,"
-	print "// it returns a subslice with any data that might follow."
-	print "func " funcname "(data []byte, b *bool) ([]byte, bool) {"
-	print "\tif len(data) < 1 {"
-	print "\t\treturn nil, false"
-	print "\t}"
-	print "\tif data[0] != 0 {"
-	print "\t\t*b = true"
-	print "\t} else {"
-	print "\t\t*b = false"
-	print "\t}"
-	print "\treturn data[1:], true"
-	print "}"
-	print ""
-
-	CodegenDeserialize["bool"] = \
-		"\tif data, ok = " funcname "(data, &%s); !ok {\n" \
-		"\t\treturn nil, ok\n" \
-		"\t}\n"
-
-	funcname = codegen_private("AppendStringTo")
-	print "// " funcname " tries to serialize a string value,"
-	print "// appending it to the end of a byte stream."
-	print "func " funcname "(data []byte, s string) ([]byte, bool) {"
-	print "\tif len(s) > math.MaxUint32 {"
-	print "\t\treturn nil, false"
-	print "\t}"
-	print "\tdata = binary.BigEndian.AppendUint32(data, uint32(len(s)))"
-	print "\treturn append(data, s...), true"
-	print "}"
-	print ""
-
-	CodegenSerialize["string"] = \
-		"\tif data, ok = " funcname "(data, %s); !ok {\n" \
-		"\t\treturn nil, ok\n" \
-		"\t}\n"
-
-	funcname = codegen_private("ConsumeStringFrom")
-	print "// " funcname " tries to deserialize a string value"
-	print "// from the beginning of a byte stream. When successful,"
-	print "// it returns a subslice with any data that might follow."
-	print "func " funcname "(data []byte, s *string) ([]byte, bool) {"
-	print "\tif len(data) < 4 {"
-	print "\t\treturn nil, false"
-	print "\t}"
-	print "\tlength := binary.BigEndian.Uint32(data)"
-	print "\tif data = data[4:]; uint64(len(data)) < uint64(length) {"
-	print "\t\treturn nil, false"
-	print "\t}"
-	print "\t*s = string(data[:length])"
-	print "\tif !utf8.ValidString(*s) {"
-	print "\t\treturn nil, false"
-	print "\t}"
-	print "\treturn data[length:], true"
-	print "}"
-	print ""
-
-	CodegenDeserialize["string"] = \
-		"\tif data, ok = " funcname "(data, &%s); !ok {\n" \
-		"\t\treturn nil, ok\n" \
-		"\t}\n"
-
-	funcname = codegen_private("UnmarshalEnumJSON")
-	print "// " funcname " converts a JSON fragment to an integer,"
-	print "// ensuring that it's within the expected range of enum values."
-	print "func " funcname "(data []byte) (int64, error) {"
-	print "\tvar n int64"
-	print "\tif err := json.Unmarshal(data, &n); err != nil {"
-	print "\t\treturn 0, err"
-	print "\t} else if n > math.MaxInt8 || n < math.MinInt8 {"
-	print "\t\treturn 0, errors.New(`integer out of range`)"
-	print "\t} else {"
-	print "\t\treturn n, nil"
-	print "\t}"
-	print "}"
-	print ""
-}
-
-function codegen_constant(name, value) {
-	print "const " PrefixCamel snaketocamel(name) " = " value
-	print ""
-}
-
-function codegen_enum_value(name, subname, value, cg,    goname) {
-	goname = PrefixCamel name snaketocamel(subname)
-	append(cg, "fields",
-		"\t" goname " = " value "\n")
-	append(cg, "stringer",
-		"\tcase " goname ":\n" \
-		"\t\treturn `" snaketocamel(subname) "`\n")
-	append(cg, "marshal",
-		goname ",\n")
-	append(cg, "unmarshal",
-		"\tcase `" snaketocamel(subname) "`:\n" \
-		"\t\t*v = " goname "\n")
-}
-
-function codegen_enum(name, cg,    gotype, fields, funcname) {
-	gotype = PrefixCamel name
-	print "type " gotype " int8"
-	print ""
-
-	print "const ("
-	print cg["fields"] ")"
-	print ""
-
-	print "func (v " gotype ") String() string {"
-	print "\tswitch v {"
-	print cg["stringer"] "\tdefault:"
-	print "\t\treturn strconv.Itoa(int(v))"
-	print "\t}"
-	print "}"
-	print ""
-
-	CodegenIsMarshaler[name] = 1
-	fields = cg["marshal"]
-	sub(/,\n$/, ":", fields)
-	gsub(/\n/, "\n\t", fields)
-	print "func (v " gotype ") MarshalJSON() ([]byte, error) {"
-	print "\tswitch v {"
-	print indent("case " fields)
-	print "\t\treturn []byte(`\"` + v.String() + `\"`), nil"
-	print "\t}"
-	print "\treturn json.Marshal(int(v))"
-	print "}"
-	print ""
-
-	funcname = codegen_private("UnmarshalEnumJSON")
-	print "func (v *" gotype ") UnmarshalJSON(data []byte) error {"
-	print "\tvar s string"
-	print "\tif json.Unmarshal(data, &s) == nil {"
-	print "\t\t// Handled below."
-	print "\t} else if n, err := " funcname "(data); err != nil {"
-	print "\t\treturn err"
-	print "\t} else {"
-	print "\t\t*v = " gotype "(n)"
-	print "\t\treturn nil"
-	print "\t}"
-	print ""
-	print "\tswitch s {"
-	print cg["unmarshal"] "\tdefault:"
-	print "\t\treturn errors.New(`unrecognized value: ` + s)"
-	print "\t}"
-	print "\treturn nil"
-	print "}"
-	print ""
-
-	# XXX: This should also check if it isn't out-of-range for any reason,
-	# but our usage of sprintf() stands in the way a bit.
-	CodegenSerialize[name] = "\tdata = append(data, uint8(%s))\n"
-	CodegenDeserialize[name] = \
-		"\tif len(data) >= 1 {\n" \
-		"\t\t%s, data = " gotype "(data[0]), data[1:]\n" \
-		"\t} else {\n" \
-		"\t\treturn nil, false\n" \
-		"\t}\n"
-
-	CodegenGoType[name] = gotype
-	for (i in cg)
-		delete cg[i]
-}
-
-function codegen_marshal(type, f,    marshal) {
-	if (CodegenAppendJSON[type])
-		return sprintf(CodegenAppendJSON[type], f)
-
-	# Complex types are json.Marshalers, there's no need to json.Marshal(&f).
-	if (CodegenIsMarshaler[type])
-		marshal = f ".MarshalJSON()"
-	else
-		marshal = "json.Marshal(" f ")"
-
-	return \
-		"\tif j, err := " marshal "; err != nil {\n" \
-		"\t\treturn nil, err\n" \
-		"\t} else {\n" \
-		"\t\tb = append(b, j...)\n" \
-		"\t}\n"
-}
-
-function codegen_struct_field_marshal(d, cg,    camel, f, marshal) {
-	camel = snaketocamel(d["name"])
-	f = "s." camel
-	if (!d["isarray"]) {
-		append(cg, "marshal",
-			"\tb = append(b, `,\"" decapitalize(camel) "\":`...)\n" \
-			codegen_marshal(d["type"], f))
-		return
-	}
-
-	# Note that we do not produce `null` for nil slices, unlike encoding/json.
-	# And arrays never get deserialized as such.
-	if (d["type"] == "u8") {
-		append(cg, "marshal",
-			"\tb = append(b, `,\"" decapitalize(camel) "\":\"`...)\n" \
-			"\tb = append(b, base64.StdEncoding.EncodeToString(" f ")...)\n" \
-			"\tb = append(b, '\"')\n")
-		return
-	}
-
-	append(cg, "marshal",
-		"\tb = append(b, `,\"" decapitalize(camel) "\":[`...)\n" \
-		"\tfor i := 0; i < len(" f "); i++ {\n" \
-		"\t\tif i > 0 {\n" \
-		"\t\t\tb = append(b, ',')\n" \
-		"\t\t}\n" \
-		indent(codegen_marshal(d["type"], f "[i]")) \
-		"\t}\n" \
-		"\tb = append(b, ']')\n")
-}
-
-function codegen_struct_field(d, cg,    camel, f, serialize, deserialize) {
-	codegen_struct_field_marshal(d, cg)
-
-	camel = snaketocamel(d["name"])
-	f = "s." camel
-	serialize = CodegenSerialize[d["type"]]
-	deserialize = CodegenDeserialize[d["type"]]
-	if (!d["isarray"]) {
-		append(cg, "fields", "\t" camel " " CodegenGoType[d["type"]] \
-			" `json:\"" decapitalize(camel) "\"`\n")
-		append(cg, "serialize", sprintf(serialize, f))
-		append(cg, "deserialize", sprintf(deserialize, f))
-		return
-	}
-
-	append(cg, "fields", "\t" camel " []" CodegenGoType[d["type"]] \
-		" `json:\"" decapitalize(camel) "\"`\n")
-
-	# XXX: This should also check if it isn't out-of-range for any reason.
-	append(cg, "serialize",
-		sprintf(CodegenSerialize["u32"], "uint32(len(" f "))"))
-	if (d["type"] == "u8") {
-		append(cg, "serialize",
-			"\tdata = append(data, " f "...)\n")
-	} else {
-		append(cg, "serialize",
-			"\tfor i := 0; i < len(" f "); i++ {\n" \
-			indent(sprintf(serialize, f "[i]")) \
-			"\t}\n")
-	}
-
-	append(cg, "deserialize",
-		"\t{\n" \
-		"\t\tvar length uint32\n" \
-		indent(sprintf(CodegenDeserialize["u32"], "length")))
-	if (d["type"] == "u8") {
-		append(cg, "deserialize",
-			"\t\tif uint64(len(data)) < uint64(length) {\n" \
-			"\t\t\treturn nil, false\n" \
-			"\t\t}\n" \
-			"\t\t" f ", data = data[:length], data[length:]\n" \
-			"\t}\n")
-	} else {
-		append(cg, "deserialize",
-			"\t\t" f " = make([]" CodegenGoType[d["type"]] ", length)\n" \
-			"\t}\n" \
-			"\tfor i := 0; i < len(" f "); i++ {\n" \
-			indent(sprintf(deserialize, f "[i]")) \
-			"\t}\n")
-	}
-}
-
-function codegen_struct_tag(d, cg,    camel, f) {
-	codegen_struct_field_marshal(d, cg)
-
-	camel = snaketocamel(d["name"])
-	f = "s." camel
-	append(cg, "fields", "\t" camel " " CodegenGoType[d["type"]] \
-		" `json:\"" decapitalize(camel) "\"`\n")
-	append(cg, "serialize", sprintf(CodegenSerialize[d["type"]], f))
-	# Do not deserialize here, that is already done by the containing union.
-}
-
-function codegen_struct(name, cg,    gotype) {
-	gotype = PrefixCamel name
-	print "type " gotype " struct {\n" cg["fields"] "}\n"
-
-	if (cg["marshal"]) {
-		CodegenIsMarshaler[name] = 1
-		print "func (s *" gotype ") MarshalJSON() ([]byte, error) {"
-		print "\tb := []byte{}"
-		print cg["marshal"] "\tb[0] = '{'"
-		print "\treturn append(b, '}'), nil"
-		print "}"
-		print ""
-	}
-
-	if (cg["serialize"]) {
-		print "func (s *" gotype ") AppendTo(data []byte) ([]byte, bool) {"
-		print "\tok := true"
-		print cg["serialize"] "\treturn data, ok"
-		print "}"
-		print ""
-
-		CodegenSerialize[name] = \
-			"\tif data, ok = %s.AppendTo(data); !ok {\n" \
-			"\t\treturn nil, ok\n" \
-			"\t}\n"
-	}
-	if (cg["deserialize"]) {
-		print "func (s *" gotype ") ConsumeFrom(data []byte) ([]byte, bool) {"
-		print "\tok := true"
-		print cg["deserialize"] "\treturn data, ok"
-		print "}"
-		print ""
-
-		CodegenDeserialize[name] = \
-			"\tif data, ok = %s.ConsumeFrom(data); !ok {\n" \
-			"\t\treturn nil, ok\n" \
-			"\t}\n"
-	}
-
-	CodegenGoType[name] = gotype
-	for (i in cg)
-		delete cg[i]
-}
-
-function codegen_union_tag(d, cg) {
-	cg["tagtype"] = d["type"]
-	cg["tagname"] = d["name"]
-	# The tag is implied from the type of struct stored in the interface.
-}
-
-function codegen_union_struct(name, casename, cg, scg,     structname, init) {
-	# And thus not all generated structs are present in Types.
-	structname = name snaketocamel(casename)
-	codegen_struct(structname, scg)
-
-	init = CodegenGoType[structname] "{" snaketocamel(cg["tagname"]) \
-		": " decapitalize(snaketocamel(cg["tagname"])) "}"
-	append(cg, "unmarshal",
-		"\tcase " CodegenGoType[cg["tagtype"]] snaketocamel(casename) ":\n" \
-		"\t\ts := " init "\n" \
-		"\t\terr = json.Unmarshal(data, &s)\n" \
-		"\t\tu.Interface = &s\n")
-	append(cg, "serialize",
-		"\tcase *" CodegenGoType[structname] ":\n" \
-		indent(sprintf(CodegenSerialize[structname], "union")))
-	append(cg, "deserialize",
-		"\tcase " CodegenGoType[cg["tagtype"]] snaketocamel(casename) ":\n" \
-		"\t\ts := " init "\n" \
-		indent(sprintf(CodegenDeserialize[structname], "s")) \
-		"\t\tu.Interface = &s\n")
-}
-
-function codegen_union(name, cg,    gotype, tagfield, tagvar) {
-	gotype = PrefixCamel name
-	print "type " gotype " struct {"
-	print "\tInterface any"
-	print "}"
-	print ""
-
-	# This cannot be a pointer method, it wouldn't work recursively.
-	CodegenIsMarshaler[name] = 1
-	print "func (u " gotype ") MarshalJSON() ([]byte, error) {"
-	print "\treturn u.Interface.(json.Marshaler).MarshalJSON()"
-	print "}"
-	print ""
-
-	tagfield = snaketocamel(cg["tagname"])
-	tagvar = decapitalize(tagfield)
-	print "func (u *" gotype ") UnmarshalJSON(data []byte) (err error) {"
-	print "\tvar t struct {"
-	print "\t\t" tagfield " " CodegenGoType[cg["tagtype"]] \
-		" `json:\"" tagvar "\"`"
-	print "\t}"
-	print "\tif err := json.Unmarshal(data, &t); err != nil {"
-	print "\t\treturn err"
-	print "\t}"
-	print ""
-	print "\tswitch " tagvar " := t." tagfield "; " tagvar " {"
-	print cg["unmarshal"] "\tdefault:"
-	print "\t\terr = errors.New(`unsupported value: ` + " tagvar ".String())"
-	print "\t}"
-	print "\treturn err"
-	print "}"
-	print ""
-
-	# XXX: Consider changing the interface into an AppendTo/ConsumeFrom one,
-	# that would eliminate these type case switches entirely.
-	# On the other hand, it would make it possible to send unsuitable structs.
-	print "func (u *" gotype ") AppendTo(data []byte) ([]byte, bool) {"
-	print "\tok := true"
-	print "\tswitch union := u.Interface.(type) {"
-	print cg["serialize"] "\tdefault:"
-	print "\t\treturn nil, false"
-	print "\t}"
-	print "\treturn data, ok"
-	print "}"
-	print ""
-
-	CodegenSerialize[name] = \
-		"\tif data, ok = %s.AppendTo(data); !ok {\n" \
-		"\t\treturn nil, ok\n" \
-		"\t}\n"
-
-	print "func (u *" gotype ") ConsumeFrom(data []byte) ([]byte, bool) {"
-	print "\tok := true"
-	print "\tvar " tagvar " " CodegenGoType[cg["tagtype"]]
-	print sprintf(CodegenDeserialize[cg["tagtype"]], tagvar)
-	print "\tswitch " tagvar " {"
-	print cg["deserialize"] "\tdefault:"
-	print "\t\treturn nil, false"
-	print "\t}"
-	print "\treturn data, ok"
-	print "}"
-	print ""
-
-	CodegenDeserialize[name] = \
-		"\tif data, ok = %s.ConsumeFrom(data); !ok {\n" \
-		"\t\treturn nil, ok\n" \
-		"\t}\n"
-
-	CodegenGoType[name] = gotype
-	for (i in cg)
-		delete cg[i]
-}