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Optional-ness in reflection (#6097)

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* Optional scalars in reflection

* fixed name collision

* Remove code duplicated by merge

Co-authored-by: Casper Neo <cneo@google.com>
This commit is contained in:
Casper
2020-09-11 14:20:32 -07:00
committed by GitHub
parent 338944d3d9
commit c75ae24293
11 changed files with 523 additions and 487 deletions
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32
src/idl_parser.cpp
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@@ -743,19 +743,6 @@ CheckedError Parser::ParseField(StructDef &struct_def) {
return Error(
"default values currently only supported for scalars in tables");
}
// Mark the optional scalars. Note that a side effect of ParseSingleValue is
// fixing field->value.constant to null.
if (IsScalar(type.base_type)) {
field->optional = (field->value.constant == "null");
if (field->optional && !SupportsOptionalScalars()) {
return Error(
"Optional scalars are not yet supported in at least one the of "
"the specified programming languages."
);
}
}
// Append .0 if the value has not it (skip hex and scientific floats).
// This suffix needed for generated C++ code.
if (IsFloat(type.base_type)) {
@@ -845,6 +832,23 @@ CheckedError Parser::ParseField(StructDef &struct_def) {
field->required = field->attributes.Lookup("required") != nullptr;
if (field->required && (struct_def.fixed || IsScalar(type.base_type)))
return Error("only non-scalar fields in tables may be 'required'");
// Mark the optional scalars. Note that a side effect of ParseSingleValue is
// fixing field->value.constant to null.
if (IsScalar(type.base_type)) {
field->optional = (field->value.constant == "null");
if (field->optional && !SupportsOptionalScalars()) {
return Error(
"Optional scalars are not yet supported in at least one the of "
"the specified programming languages."
);
}
} else {
// For nonscalars, only required fields are non-optional.
// At least until https://github.com/google/flatbuffers/issues/6053
field->optional = !field->required;
}
field->key = field->attributes.Lookup("key") != nullptr;
if (field->key) {
if (struct_def.has_key) return Error("only one field may be set as 'key'");
@@ -3307,7 +3311,7 @@ Offset<reflection::Field> FieldDef::Serialize(FlatBufferBuilder *builder,
IsInteger(value.type.base_type) ? StringToInt(value.constant.c_str()) : 0,
// result may be platform-dependent if underlying is float (not double)
IsFloat(value.type.base_type) ? d : 0.0, deprecated, required, key,
attr__, docs__);
attr__, docs__, optional);
// TODO: value.constant is almost always "0", we could save quite a bit of
// space by sharing it. Same for common values of value.type.
}