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[codegen] Generate from_json cpp type mappings #19

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Merged
edriouk merged 1 commit into from
Jul 10, 2025
Merged

[codegen] Generate from_json cpp type mappings #19

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44 changes: 33 additions & 11 deletions codegen/src/codegen.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,15 @@ using namespace jsonrpccxx;\n`;
j[key] = opt.value();
}
}\n`;
readonly cppFromJsonTemplates =
` template<class T> void from_json(const nlohmann::json& j, const string& key, T& value) {
j.at(key).get_to(value);
}
template<class T> void from_json(const nlohmann::json& j, const string& key, optional<T>& opt) {
if (j.contains(key) && !j[key].is_null()) {
opt = j[key].get<T>();
}
}\n`;

public run(argv: string[]) {
program.parse(argv);
Expand Down Expand Up @@ -171,6 +180,9 @@ using namespace jsonrpccxx;\n`;
public getType(name: string, item: any, suffix?: string, prefix?: string) : { cpp: string, ts: string } {
let cppType = '';
let tsType = '';
if(!item) {
return { cpp: cppType, ts: tsType };
}
if (item.$ref) {
const ref = item.$ref.match(/^#\/components\/schemas\/(.*)/);
tsType = ref ? ref[1] : '';
Expand Down Expand Up @@ -264,7 +276,7 @@ using namespace jsonrpccxx;\n`;
const cppParams: string[] = [];
const cppRegParams: string[] = [];
for (const [param, item] of Object.entries(params.properties)) {
cppParams.push(`const ${this.getType(name, item).cpp}& ${param}`);
cppParams.push(`const ${this.getType(name, item, '', 'RpcArgs::').cpp}& ${param}`);
cppRegParams.push(`"${param}"`);
}
cppFunction += cppParams.join(", ");
Expand Down Expand Up @@ -314,24 +326,24 @@ using namespace jsonrpccxx;\n`;
return content;
}

public genToJson(members: Member[]) : string {
public genJsonTypeMap(jsonFunction: string, members: Member[]) : string {
let content = '';
for (const element of members) {
const cppToJson = `to_json(j, "${element.name}", s.${this.kebabToCamel(element.name)});`;
content += ` ${cppToJson}\n`;
const cppJsonTypeMap = `${jsonFunction}(j, "${element.name}", s.${this.kebabToCamel(element.name)});`;
content += ` ${cppJsonTypeMap}\n`;
}
return content;
}

public genParentToJson(struct: Struct) : string {
public genParentJsonTypeMap(jsonFunction: string, struct: Struct) : string {
let content = '';
if (struct.extends) {
for (const parent of struct.extends) {
if (parent in this.structs) {
const parentStruct = this.structs[parent];
content += this.genParentToJson(parentStruct);
content += this.genParentJsonTypeMap(jsonFunction, parentStruct);
if (parentStruct.members) {
content += this.genToJson(parentStruct.members);
content += this.genJsonTypeMap(jsonFunction, parentStruct.members);
}
}
}
Expand Down Expand Up @@ -387,10 +399,20 @@ using namespace jsonrpccxx;\n`;
const struct = this.structs[name];
if (struct.members) {
content += ` inline void to_json(nlohmann::json& j, const ${name}& s) {\n`;
content += this.genParentToJson(struct);
if (struct.members) {
content += this.genToJson(struct.members);
}
content += this.genParentJsonTypeMap('to_json', struct);
content += this.genJsonTypeMap('to_json', struct.members);
content += ` }\n`;
}
}

// cpp from json
content += `\n${this.cppFromJsonTemplates}`;
for (const name in this.structs) {
const struct = this.structs[name];
if (struct.members) {
content += ` inline void from_json(const nlohmann::json& j, ${name}& s) {\n`;
content += this.genParentJsonTypeMap('from_json', struct);
content += this.genJsonTypeMap('from_json', struct.members);
content += ` }\n`;
}
}
Expand Down