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[flexbuffers, json] Parse nan and inf (#6512)

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This commit is contained in:
Vladimir Glavnyy
2021-03-16 01:44:42 +07:00
committed by GitHub
parent 6543ba5297
commit 69b329fc87
3 changed files with 52 additions and 0 deletions
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2
include/flatbuffers/idl.h
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@@ -956,6 +956,8 @@ class Parser : public ParserState {
FLATBUFFERS_CHECKED_ERROR ParseProtoCurliesOrIdent();
FLATBUFFERS_CHECKED_ERROR ParseTypeFromProtoType(Type *type);
FLATBUFFERS_CHECKED_ERROR SkipAnyJsonValue();
FLATBUFFERS_CHECKED_ERROR ParseFlexBufferNumericConstant(
flexbuffers::Builder *builder);
FLATBUFFERS_CHECKED_ERROR ParseFlexBufferValue(flexbuffers::Builder *builder);
FLATBUFFERS_CHECKED_ERROR StartParseFile(const char *source,
const char *source_filename);

24
src/idl_parser.cpp
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@@ -3009,6 +3009,15 @@ CheckedError Parser::SkipAnyJsonValue() {
return NoError();
}
CheckedError Parser::ParseFlexBufferNumericConstant(
flexbuffers::Builder *builder) {
double d;
if (!StringToNumber(attribute_.c_str(), &d))
return Error("unexpected floating-point constant: " + attribute_);
builder->Double(d);
return NoError();
}
CheckedError Parser::ParseFlexBufferValue(flexbuffers::Builder *builder) {
ParseDepthGuard depth_guard(this);
ECHECK(depth_guard.Check());
@@ -3056,6 +3065,18 @@ CheckedError Parser::ParseFlexBufferValue(flexbuffers::Builder *builder) {
EXPECT(kTokenFloatConstant);
break;
}
case '-':
case '+': {
// `[-+]?(nan|inf|infinity)`, see ParseSingleValue().
const auto sign = static_cast<char>(token_);
NEXT();
if (token_ != kTokenIdentifier)
return Error("floating-point constant expected");
attribute_.insert(0, 1, sign);
ECHECK(ParseFlexBufferNumericConstant(builder));
NEXT();
break;
}
default:
if (IsIdent("true")) {
builder->Bool(true);
@@ -3066,6 +3087,9 @@ CheckedError Parser::ParseFlexBufferValue(flexbuffers::Builder *builder) {
} else if (IsIdent("null")) {
builder->Null();
NEXT();
} else if (IsIdent("inf") || IsIdent("infinity") || IsIdent("nan")) {
ECHECK(ParseFlexBufferNumericConstant(builder));
NEXT();
} else
return TokenError();
}

26
tests/test.cpp
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@@ -3020,6 +3020,31 @@ void FlexBuffersTest() {
TEST_EQ(slb.GetSize(), 664);
}
void FlexBuffersFloatingPointTest() {
#if defined(FLATBUFFERS_HAS_NEW_STRTOD) && (FLATBUFFERS_HAS_NEW_STRTOD > 0)
flexbuffers::Builder slb(512,
flexbuffers::BUILDER_FLAG_SHARE_KEYS_AND_STRINGS);
// Parse floating-point values from JSON:
flatbuffers::Parser parser;
slb.Clear();
auto jsontest =
"{ a: [1.0, nan, inf, infinity, -inf, +inf, -infinity, 8.0] }";
TEST_EQ(parser.ParseFlexBuffer(jsontest, nullptr, &slb), true);
auto jroot = flexbuffers::GetRoot(slb.GetBuffer());
auto jmap = jroot.AsMap();
auto jvec = jmap["a"].AsVector();
TEST_EQ(8, jvec.size());
TEST_EQ(1.0, jvec[0].AsDouble());
TEST_ASSERT(is_quiet_nan(jvec[1].AsDouble()));
TEST_EQ(infinity_d, jvec[2].AsDouble());
TEST_EQ(infinity_d, jvec[3].AsDouble());
TEST_EQ(-infinity_d, jvec[4].AsDouble());
TEST_EQ(+infinity_d, jvec[5].AsDouble());
TEST_EQ(-infinity_d, jvec[6].AsDouble());
TEST_EQ(8.0, jvec[7].AsDouble());
#endif
}
void FlexBuffersDeprecatedTest() {
// FlexBuffers as originally designed had a flaw involving the
// FBT_VECTOR_STRING datatype, and this test documents/tests the fix for it.
@@ -3909,6 +3934,7 @@ int FlatBufferTests() {
FieldIdentifierTest();
StringVectorDefaultsTest();
ParseIncorrectMonsterJsonTest();
FlexBuffersFloatingPointTest();
return 0;
}