From 98b0a4ef3d06fd4bc46809f0cb0f19f1bd205802 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Thu, 15 Sep 2022 03:15:52 +0200
Subject: xP: further optimize JSON marshalling

---
 xC-gen-proto-go.awk | 47 +++++++++++++++++++++++++++--------------------
 1 file changed, 27 insertions(+), 20 deletions(-)

diff --git a/xC-gen-proto-go.awk b/xC-gen-proto-go.awk
index a2244b5..48371eb 100644
--- a/xC-gen-proto-go.awk
+++ b/xC-gen-proto-go.awk
@@ -15,6 +15,9 @@ function define_sint(size,    shortname, gotype) {
 	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] = \
@@ -42,6 +45,9 @@ function define_uint(size,    shortname, gotype) {
 	gotype = "uint" size
 	define_internal(shortname, gotype)
 
+	CodegenAppendJSON[shortname] = \
+		"\tb = strconv.AppendUint(b, uint64(%s), 10)\n"
+
 	# Both byte and uint8 luckily marshal as base64-encoded JSON strings.
 	if (size == 8) {
 		CodegenSerialize[shortname] = "\tdata = append(data, %s)\n"
@@ -76,6 +82,8 @@ function codegen_begin() {
 	define_uint("64")
 
 	define_internal("bool", "bool")
+	CodegenAppendJSON["bool"] = \
+		"\tb = strconv.AppendBool(b, %s)\n"
 	CodegenSerialize["bool"] = \
 		"\tif %s {\n" \
 		"\t\tdata = append(data, 1)\n" \
@@ -254,24 +262,32 @@ function codegen_enum(name, cg,    gotype, fields) {
 		delete cg[i]
 }
 
+function codegen_marshal(type, f,    marshal) {
+	if (CodegenAppendJSON[type])
+		return sprintf(CodegenAppendJSON[type], 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
 
 	# Complex types are json.Marshalers, there's no need to json.Marshal(&f).
 	if (!d["isarray"]) {
-		if (CodegenIsMarshaler[d["type"]])
-			marshal = f ".MarshalJSON()"
-		else
-			marshal = "json.Marshal(" f ")"
-
 		append(cg, "marshal",
 			"\tb = append(b, `,\"" decapitalize(camel) "\":`...)\n" \
-			"\tif j, err := " marshal "; err != nil {\n" \
-			"\t\treturn nil, err\n" \
-			"\t} else {\n" \
-			"\t\tb = append(b, j...)\n" \
-			"\t}\n")
+			codegen_marshal(d["type"], f))
 		return
 	}
 
@@ -283,22 +299,13 @@ function codegen_struct_field_marshal(d, cg,    camel, f, marshal) {
 		return
 	}
 
-	if (CodegenIsMarshaler[d["type"]])
-		marshal = f "[i].MarshalJSON()"
-	else
-		marshal = "json.Marshal(" f "[i])"
-
 	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" \
-		"\t\tif j, err := " marshal "; err != nil {\n" \
-		"\t\t\treturn nil, err\n" \
-		"\t\t} else {\n" \
-		"\t\t\tb = append(b, j...)\n" \
-		"\t\t}\n" \
+		indent(codegen_marshal(d["type"], f "[i]")) \
 		"\t}\n" \
 		"\tb = append(b, ']')\n")
 }
-- 
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