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printjson: add printer for nested TaggedPtr's

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This commit is contained in:
Roland Conybeare 2023-10-09 14:54:39 -04:00
commit 45a0675436
1 changed files with 44 additions and 1 deletions
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45
src/printjson/PrintJson.cpp
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@ -17,6 +17,7 @@ namespace xo {
using xo::reflect::TypeDescr;
using xo::reflect::TaggedPtr;
using xo::reflect::TaggedRcptr;
using xo::print::quoted;
using xo::time::iso8601;
using xo::ref::rp;
using xo::xtag;
@ -183,6 +184,46 @@ namespace xo {
this->print_tp(obj->self_tp(), p_os);
} /*print_obj*/
/* Consider:
* TaggedPtr tp = ...;
* std::ostream * p_os = ...;
*
* PrintJson * pjson = PrintJsonSingleton::instance();
*
* // print json representation, depending on runtime type of tp's target
* pjson->print_tp(tp, p_os);
*
* // can also use .print(), relying on JsonPrinter_TaggedPtr
* // .print() will next original TaggedPtr in another;
* // this shim unwinds that
* //
* pjson->print(tp, p_os);
*/
class JsonPrinter_TaggedPtr : public JsonPrinter {
public:
JsonPrinter_TaggedPtr(PrintJson const * pjson) : JsonPrinter(pjson) {}
virtual void print_json(TaggedPtr tp,
std::ostream * p_os) const override {
TaggedPtr * x = this->check_recover_native<TaggedPtr>(tp, p_os);
if (x) {
this->pjson()->print_tp(*x, p_os);
}
} /*print_json*/
}; /*JsonPrinter_TaggedPtr*/
namespace {
void
provide_tagged_ptr_printer(PrintJson * p_json)
{
std::unique_ptr<JsonPrinter> printer(new JsonPrinter_TaggedPtr(p_json));
p_json->provide_printer(Reflect::require<TaggedPtr>(),
std::move(printer));
} /*provide_tagged_ptr_printer*/
} /*namespace*/
class JsonPrinter_bool : public JsonPrinter {
public:
JsonPrinter_bool(PrintJson const * pjson) : JsonPrinter(pjson) {}
@ -299,7 +340,7 @@ namespace xo {
if (x) {
/* TODO: escapes special characters */
*p_os << *x;
*p_os << quoted(*x);
} else {
report_internal_type_consistency_error(Reflect::require<T>(),
tp.td(),
@ -360,6 +401,8 @@ namespace xo {
void
PrintJson::provide_std_printers()
{
provide_tagged_ptr_printer(this);
provide_bool_printer(this);
provide_integer_printer<std::int16_t>(this);