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[C#] Optional Scalars (#6217)

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* [C#] Optional Scalars

* Moved scalar optional check to avoid null enum conversion
This commit is contained in:
Derek Bailey
2020-10-30 13:18:59 -07:00
committed by GitHub
parent 6034de286a
commit ea92a668d8
11 changed files with 758 additions and 22 deletions
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35
src/idl_gen_csharp.cpp
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@@ -214,6 +214,9 @@ class CSharpGenerator : public BaseGenerator {
std::string GenDefaultValue(const FieldDef &field,
bool enableLangOverrides) const {
// If it is an optional scalar field, the default is null
if (field.IsScalarOptional()) { return "null"; }
auto &value = field.value;
if (enableLangOverrides) {
// handles both enum case and vector of enum case
@@ -396,6 +399,7 @@ class CSharpGenerator : public BaseGenerator {
} else {
code += ", ";
code += GenTypeBasic(type);
if (field.IsScalarOptional()) { code += "?"; }
if (array_cnt > 0) {
code += "[";
for (size_t i = 1; i < array_cnt; i++) code += ",";
@@ -610,6 +614,7 @@ class CSharpGenerator : public BaseGenerator {
optional = "?";
conditional_cast = "(" + type_name_dest + optional + ")";
}
if (field.IsScalarOptional()) { optional = "?"; }
std::string dest_mask = "";
std::string dest_cast = DestinationCast(field.value.type);
std::string src_cast = SourceCast(field.value.type);
@@ -646,9 +651,11 @@ class CSharpGenerator : public BaseGenerator {
// that doesn't need to be casted. However, default values for enum
// elements of vectors are integer literals ("0") and are still casted
// for clarity.
if (field.value.type.enum_def == nullptr ||
IsVector(field.value.type)) {
default_cast = "(" + type_name_dest + ")";
// If the scalar is optional and enum, we still need the cast.
if ((field.value.type.enum_def == nullptr ||
IsVector(field.value.type)) ||
(IsEnum(field.value.type) && field.IsScalarOptional())) {
default_cast = "(" + type_name_dest + optional + ")";
}
}
std::string member_suffix = "; ";
@@ -974,6 +981,7 @@ class CSharpGenerator : public BaseGenerator {
code += " = null";
} else {
code += GenTypeBasic(field.value.type);
if (field.IsScalarOptional()) { code += "?"; }
code += " ";
code += field.name;
if (!IsScalar(field.value.type.base_type)) code += "Offset";
@@ -1034,6 +1042,7 @@ class CSharpGenerator : public BaseGenerator {
code += GenTypeBasic(field.value.type);
auto argname = MakeCamel(field.name, false);
if (!IsScalar(field.value.type.base_type)) argname += "Offset";
if (field.IsScalarOptional()) { code += "?"; }
code += " " + argname + ") { builder.Add";
code += GenMethod(field.value.type) + "(";
code += NumToString(it - struct_def.fields.vec.begin()) + ", ";
@@ -1043,8 +1052,13 @@ class CSharpGenerator : public BaseGenerator {
field.value.type.base_type != BASE_TYPE_UNION) {
code += ".Value";
}
code += ", ";
code += GenDefaultValue(field, false);
if (!field.IsScalarOptional()) {
// When the scalar is optional, use the builder method that doesn't
// supply a default value. Otherwise, we to continue to use the
// default value method.
code += ", ";
code += GenDefaultValue(field, false);
}
code += "); }\n";
if (IsVector(field.value.type)) {
auto vector_type = field.value.type.VectorType();
@@ -1069,7 +1083,7 @@ class CSharpGenerator : public BaseGenerator {
code += SourceCastBasic(vector_type);
code += "data[i]";
if (vector_type.base_type == BASE_TYPE_STRUCT ||
IsString(vector_type))
IsString(vector_type))
code += ".Value";
code += "); return ";
code += "builder.EndVector(); }\n";
@@ -1476,11 +1490,10 @@ class CSharpGenerator : public BaseGenerator {
case BASE_TYPE_ARRAY: {
auto type_name = GenTypeGet_ObjectAPI(field.value.type, opts);
auto length_str = NumToString(field.value.type.fixed_length);
auto unpack_method = field.value.type.struct_def == nullptr
? ""
: field.value.type.struct_def->fixed
? ".UnPack()"
: "?.UnPack()";
auto unpack_method = field.value.type.struct_def == nullptr ? ""
: field.value.type.struct_def->fixed
? ".UnPack()"
: "?.UnPack()";
code += start + "new " + type_name.substr(0, type_name.length() - 1) +
length_str + "];\n";
code += " for (var _j = 0; _j < " + length_str + "; ++_j) { _o." +