Function extractFields

scripts/codegen/go.ts:346–361

* Extract a mapping from (structName, jsonFieldName) to generated Go field * metadata so wrapper code can reference emitted field names and nil behavior.

(generatedTypeCode: string)

 * metadata so wrapper code can reference emitted field names and nil behavior.
 */
function extractFields(generatedTypeCode: string): Map<string, Map<string, GoExtractedField>> {
    const result = new Map<string, Map<string, GoExtractedField>>();
    const structRe = /^type\s+(\w+)\s+struct\s*\{([^}]*)\}/gm;
    let sm;
    while ((sm = structRe.exec(generatedTypeCode)) !== null) {
        const [, structName, body] = sm;
        const fields = new Map<string, GoExtractedField>();
        const fieldRe = /^\s+(\w+)\s+([^\s`]+)\s+`json:"([^",]+)/gm;
        let fm;
        while ((fm = fieldRe.exec(body)) !== null) {
            fields.set(fm[3], { name: fm[1], type: fm[2] });
        }
        result.set(structName, fields);
    }
    return result;
}

function goTypeIsPointer(goType: string | undefined): boolean {
    return goType?.startsWith("*") ?? false;