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llvm-mirror/unittests/Support/JSONTest.cpp
Sam McCall 4c407017f3 [JSON] Add ObjectMapper::mapOptional to validate optional data. 
Currently the idiom for mapping optional fields is:
  ObjectMapper O(Val, P);
  if (!O.map("required1", Out.R1) || !O.map("required2", Out.R2))
    return false;
  O.map("optional1", Out.O1); // ignore result
  return true;

If `optional1` is present but malformed, then we won't detect/report
that error. We may even leave `Out` in an incomplete state while returning true.
Instead, we'd often prefer to ignore `optional1` if it is absent, but otherwise
behave just like map().

Differential Revision: https://reviews.llvm.org/D89128
2020-10-12 12:48:08 +02:00

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//===-- JSONTest.cpp - JSON unit tests --------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/JSON.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Testing/Support/Error.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
namespace llvm {
namespace json {
namespace {
std::string s(const Value &E) { return llvm::formatv("{0}", E).str(); }
std::string sp(const Value &E) { return llvm::formatv("{0:2}", E).str(); }
TEST(JSONTest, Types) {
EXPECT_EQ("true", s(true));
EXPECT_EQ("null", s(nullptr));
EXPECT_EQ("2.5", s(2.5));
EXPECT_EQ(R"("foo")", s("foo"));
EXPECT_EQ("[1,2,3]", s({1, 2, 3}));
EXPECT_EQ(R"({"x":10,"y":20})", s(Object{{"x", 10}, {"y", 20}}));
#ifdef NDEBUG
EXPECT_EQ(R"("<EFBFBD><EFBFBD>")", s("\xC0\x80"));
EXPECT_EQ(R"({"<EFBFBD><EFBFBD>":0})", s(Object{{"\xC0\x80", 0}}));
#else
EXPECT_DEATH(s("\xC0\x80"), "Invalid UTF-8");
EXPECT_DEATH(s(Object{{"\xC0\x80", 0}}), "Invalid UTF-8");
#endif
}
TEST(JSONTest, Constructors) {
// Lots of edge cases around empty and singleton init lists.
EXPECT_EQ("[[[3]]]", s({{{3}}}));
EXPECT_EQ("[[[]]]", s({{{}}}));
EXPECT_EQ("[[{}]]", s({{Object{}}}));
EXPECT_EQ(R"({"A":{"B":{}}})", s(Object{{"A", Object{{"B", Object{}}}}}));
EXPECT_EQ(R"({"A":{"B":{"X":"Y"}}})",
s(Object{{"A", Object{{"B", Object{{"X", "Y"}}}}}}));
EXPECT_EQ("null", s(llvm::Optional<double>()));
EXPECT_EQ("2.5", s(llvm::Optional<double>(2.5)));
EXPECT_EQ("[[2.5,null]]", s(std::vector<std::vector<llvm::Optional<double>>>{
{2.5, llvm::None}}));
}
TEST(JSONTest, StringOwnership) {
char X[] = "Hello";
Value Alias = static_cast<const char *>(X);
X[1] = 'a';
EXPECT_EQ(R"("Hallo")", s(Alias));
std::string Y = "Hello";
Value Copy = Y;
Y[1] = 'a';
EXPECT_EQ(R"("Hello")", s(Copy));
}
TEST(JSONTest, CanonicalOutput) {
// Objects are sorted (but arrays aren't)!
EXPECT_EQ(R"({"a":1,"b":2,"c":3})", s(Object{{"a", 1}, {"c", 3}, {"b", 2}}));
EXPECT_EQ(R"(["a","c","b"])", s({"a", "c", "b"}));
EXPECT_EQ("3", s(3.0));
}
TEST(JSONTest, Escaping) {
std::string Test = {
0, // Strings may contain nulls.
'\b', '\f', // Have mnemonics, but we escape numerically.
'\r', '\n', '\t', // Escaped with mnemonics.
'S', '\"', '\\', // Printable ASCII characters.
'\x7f', // Delete is not escaped.
'\xce', '\x94', // Non-ASCII UTF-8 is not escaped.
};
std::string TestString = R"("\u0000\u0008\u000c\r\n\tS\"\\)"
"\x7f\xCE\x94\"";
EXPECT_EQ(TestString, s(Test));
EXPECT_EQ(R"({"object keys are\nescaped":true})",
s(Object{{"object keys are\nescaped", true}}));
}
TEST(JSONTest, PrettyPrinting) {
const char Str[] = R"({
"empty_array": [],
"empty_object": {},
"full_array": [
1,
null
],
"full_object": {
"nested_array": [
{
"property": "value"
}
]
}
})";
EXPECT_EQ(Str, sp(Object{
{"empty_object", Object{}},
{"empty_array", {}},
{"full_array", {1, nullptr}},
{"full_object",
Object{
{"nested_array",
{Object{
{"property", "value"},
}}},
}},
}));
}
TEST(JSONTest, Array) {
Array A{1, 2};
A.emplace_back(3);
A.emplace(++A.begin(), 0);
A.push_back(4);
A.insert(++++A.begin(), 99);
EXPECT_EQ(A.size(), 6u);
EXPECT_EQ(R"([1,0,99,2,3,4])", s(std::move(A)));
}
TEST(JSONTest, Object) {
Object O{{"a", 1}, {"b", 2}, {"c", 3}};
EXPECT_TRUE(O.try_emplace("d", 4).second);
EXPECT_FALSE(O.try_emplace("a", 4).second);
auto D = O.find("d");
EXPECT_FALSE(D == O.end());
auto E = O.find("e");
EXPECT_TRUE(E == O.end());
O.erase("b");
O.erase(D);
EXPECT_EQ(O.size(), 2u);
EXPECT_EQ(R"({"a":1,"c":3})", s(std::move(O)));
}
TEST(JSONTest, Parse) {
auto Compare = [](llvm::StringRef S, Value Expected) {
if (auto E = parse(S)) {
// Compare both string forms and with operator==, in case we have bugs.
EXPECT_EQ(*E, Expected);
EXPECT_EQ(sp(*E), sp(Expected));
} else {
handleAllErrors(E.takeError(), [S](const llvm::ErrorInfoBase &E) {
FAIL() << "Failed to parse JSON >>> " << S << " <<<: " << E.message();
});
}
};
Compare(R"(true)", true);
Compare(R"(false)", false);
Compare(R"(null)", nullptr);
Compare(R"(42)", 42);
Compare(R"(2.5)", 2.5);
Compare(R"(2e50)", 2e50);
Compare(R"(1.2e3456789)", std::numeric_limits<double>::infinity());
Compare(R"("foo")", "foo");
Compare(R"("\"\\\b\f\n\r\t")", "\"\\\b\f\n\r\t");
Compare(R"("\u0000")", llvm::StringRef("\0", 1));
Compare("\"\x7f\"", "\x7f");
Compare(R"("\ud801\udc37")", u8"\U00010437"); // UTF16 surrogate pair escape.
Compare("\"\xE2\x82\xAC\xF0\x9D\x84\x9E\"", u8"\u20ac\U0001d11e"); // UTF8
Compare(
R"("LoneLeading=\ud801, LoneTrailing=\udc01, LeadingLeadingTrailing=\ud801\ud801\udc37")",
u8"LoneLeading=\ufffd, LoneTrailing=\ufffd, "
u8"LeadingLeadingTrailing=\ufffd\U00010437"); // Invalid unicode.
Compare(R"({"":0,"":0})", Object{{"", 0}});
Compare(R"({"obj":{},"arr":[]})", Object{{"obj", Object{}}, {"arr", {}}});
Compare(R"({"\n":{"\u0000":[[[[]]]]}})",
Object{{"\n", Object{
{llvm::StringRef("\0", 1), {{{{}}}}},
}}});
Compare("\r[\n\t] ", {});
}
TEST(JSONTest, ParseErrors) {
auto ExpectErr = [](llvm::StringRef Msg, llvm::StringRef S) {
if (auto E = parse(S)) {
// Compare both string forms and with operator==, in case we have bugs.
FAIL() << "Parsed JSON >>> " << S << " <<< but wanted error: " << Msg;
} else {
handleAllErrors(E.takeError(), [S, Msg](const llvm::ErrorInfoBase &E) {
EXPECT_THAT(E.message(), testing::HasSubstr(std::string(Msg))) << S;
});
}
};
ExpectErr("Unexpected EOF", "");
ExpectErr("Unexpected EOF", "[");
ExpectErr("Text after end of document", "[][]");
ExpectErr("Invalid JSON value (false?)", "fuzzy");
ExpectErr("Expected , or ]", "[2?]");
ExpectErr("Expected object key", "{a:2}");
ExpectErr("Expected : after object key", R"({"a",2})");
ExpectErr("Expected , or } after object property", R"({"a":2 "b":3})");
ExpectErr("Invalid JSON value", R"([&%!])");
ExpectErr("Invalid JSON value (number?)", "1e1.0");
ExpectErr("Unterminated string", R"("abc\"def)");
ExpectErr("Control character in string", "\"abc\ndef\"");
ExpectErr("Invalid escape sequence", R"("\030")");
ExpectErr("Invalid \\u escape sequence", R"("\usuck")");
ExpectErr("[3:3, byte=19]", R"({
"valid": 1,
invalid: 2
})");
ExpectErr("Invalid UTF-8 sequence", "\"\xC0\x80\""); // WTF-8 null
}
// Direct tests of isUTF8 and fixUTF8. Internal uses are also tested elsewhere.
TEST(JSONTest, UTF8) {
for (const char *Valid : {
"this is ASCII text",
"thïs tëxt häs BMP chäräctërs",
"𐌶𐌰L𐌾𐍈 C𐍈𐌼𐌴𐍃",
}) {
EXPECT_TRUE(isUTF8(Valid)) << Valid;
EXPECT_EQ(fixUTF8(Valid), Valid);
}
for (auto Invalid : std::vector<std::pair<const char *, const char *>>{
{"lone trailing \x81\x82 bytes", "lone trailing <20><> bytes"},
{"missing trailing \xD0 bytes", "missing trailing <20> bytes"},
{"truncated character \xD0", "truncated character <20>"},
{"not \xC1\x80 the \xE0\x9f\xBF shortest \xF0\x83\x83\x83 encoding",
"not <20><> the <20><><EFBFBD> shortest <20><><EFBFBD><EFBFBD> encoding"},
{"too \xF9\x80\x80\x80\x80 long", "too <20><><EFBFBD><EFBFBD><EFBFBD> long"},
{"surrogate \xED\xA0\x80 invalid \xF4\x90\x80\x80",
"surrogate <20><><EFBFBD> invalid <20><><EFBFBD><EFBFBD>"}}) {
EXPECT_FALSE(isUTF8(Invalid.first)) << Invalid.first;
EXPECT_EQ(fixUTF8(Invalid.first), Invalid.second);
}
}
TEST(JSONTest, Inspection) {
llvm::Expected<Value> Doc = parse(R"(
{
"null": null,
"boolean": false,
"number": 2.78,
"string": "json",
"array": [null, true, 3.14, "hello", [1,2,3], {"time": "arrow"}],
"object": {"fruit": "banana"}
}
)");
EXPECT_TRUE(!!Doc);
Object *O = Doc->getAsObject();
ASSERT_TRUE(O);
EXPECT_FALSE(O->getNull("missing"));
EXPECT_FALSE(O->getNull("boolean"));
EXPECT_TRUE(O->getNull("null"));
EXPECT_EQ(O->getNumber("number"), llvm::Optional<double>(2.78));
EXPECT_FALSE(O->getInteger("number"));
EXPECT_EQ(O->getString("string"), llvm::Optional<llvm::StringRef>("json"));
ASSERT_FALSE(O->getObject("missing"));
ASSERT_FALSE(O->getObject("array"));
ASSERT_TRUE(O->getObject("object"));
EXPECT_EQ(*O->getObject("object"), (Object{{"fruit", "banana"}}));
Array *A = O->getArray("array");
ASSERT_TRUE(A);
EXPECT_EQ((*A)[1].getAsBoolean(), llvm::Optional<bool>(true));
ASSERT_TRUE((*A)[4].getAsArray());
EXPECT_EQ(*(*A)[4].getAsArray(), (Array{1, 2, 3}));
EXPECT_EQ((*(*A)[4].getAsArray())[1].getAsInteger(),
llvm::Optional<int64_t>(2));
int I = 0;
for (Value &E : *A) {
if (I++ == 5) {
ASSERT_TRUE(E.getAsObject());
EXPECT_EQ(E.getAsObject()->getString("time"),
llvm::Optional<llvm::StringRef>("arrow"));
} else
EXPECT_FALSE(E.getAsObject());
}
}
// Verify special integer handling - we try to preserve exact int64 values.
TEST(JSONTest, Integers) {
struct {
const char *Desc;
Value Val;
const char *Str;
llvm::Optional<int64_t> AsInt;
llvm::Optional<double> AsNumber;
} TestCases[] = {
{
"Non-integer. Stored as double, not convertible.",
double{1.5},
"1.5",
llvm::None,
1.5,
},
{
"Integer, not exact double. Stored as int64, convertible.",
int64_t{0x4000000000000001},
"4611686018427387905",
int64_t{0x4000000000000001},
double{0x4000000000000000},
},
{
"Negative integer, not exact double. Stored as int64, convertible.",
int64_t{-0x4000000000000001},
"-4611686018427387905",
int64_t{-0x4000000000000001},
double{-0x4000000000000000},
},
// PR46470,
// https://developercommunity.visualstudio.com/content/problem/1093399/incorrect-result-when-printing-6917529027641081856.html
#if !defined(_MSC_VER) || _MSC_VER < 1926
{
"Dynamically exact integer. Stored as double, convertible.",
double{0x6000000000000000},
"6.9175290276410819e+18",
int64_t{0x6000000000000000},
double{0x6000000000000000},
},
#endif
{
"Dynamically integer, >64 bits. Stored as double, not convertible.",
1.5 * double{0x8000000000000000},
"1.3835058055282164e+19",
llvm::None,
1.5 * double{0x8000000000000000},
},
};
for (const auto &T : TestCases) {
EXPECT_EQ(T.Str, s(T.Val)) << T.Desc;
llvm::Expected<Value> Doc = parse(T.Str);
EXPECT_TRUE(!!Doc) << T.Desc;
EXPECT_EQ(Doc->getAsInteger(), T.AsInt) << T.Desc;
EXPECT_EQ(Doc->getAsNumber(), T.AsNumber) << T.Desc;
EXPECT_EQ(T.Val, *Doc) << T.Desc;
EXPECT_EQ(T.Str, s(*Doc)) << T.Desc;
}
}
// Sample struct with typical JSON-mapping rules.
struct CustomStruct {
CustomStruct() : B(false) {}
CustomStruct(std::string S, llvm::Optional<int> I, bool B)
: S(S), I(I), B(B) {}
std::string S;
llvm::Optional<int> I;
bool B;
};
inline bool operator==(const CustomStruct &L, const CustomStruct &R) {
return L.S == R.S && L.I == R.I && L.B == R.B;
}
inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
const CustomStruct &S) {
return OS << "(" << S.S << ", " << (S.I ? std::to_string(*S.I) : "None")
<< ", " << S.B << ")";
}
bool fromJSON(const Value &E, CustomStruct &R, Path P) {
ObjectMapper O(E, P);
return O && O.map("str", R.S) && O.map("int", R.I) &&
O.mapOptional("bool", R.B);
}
static std::string errorContext(const Value &V, const Path::Root &R) {
std::string Context;
llvm::raw_string_ostream OS(Context);
R.printErrorContext(V, OS);
return OS.str();
}
TEST(JSONTest, Deserialize) {
std::map<std::string, std::vector<CustomStruct>> R;
CustomStruct ExpectedStruct = {"foo", 42, true};
std::map<std::string, std::vector<CustomStruct>> Expected;
Value J = Object{{"foo", Array{
Object{
{"str", "foo"},
{"int", 42},
{"bool", true},
{"unknown", "ignored"},
},
Object{{"str", "bar"}},
}}};
Expected["foo"] = {
CustomStruct("foo", 42, true),
CustomStruct("bar", llvm::None, false),
};
Path::Root Root("CustomStruct");
ASSERT_TRUE(fromJSON(J, R, Root));
EXPECT_EQ(R, Expected);
(*J.getAsObject()->getArray("foo"))[0] = 123;
ASSERT_FALSE(fromJSON(J, R, Root));
EXPECT_EQ("expected object at CustomStruct.foo[0]",
toString(Root.getError()));
const char *ExpectedDump = R"({
"foo": [
/* error: expected object */
123,
{ ... }
]
})";
EXPECT_EQ(ExpectedDump, errorContext(J, Root));
CustomStruct V;
EXPECT_FALSE(fromJSON(nullptr, V, Root));
EXPECT_EQ("expected object when parsing CustomStruct",
toString(Root.getError()));
EXPECT_FALSE(fromJSON(Object{}, V, Root));
EXPECT_EQ("missing value at CustomStruct.str", toString(Root.getError()));
EXPECT_FALSE(fromJSON(Object{{"str", 1}}, V, Root));
EXPECT_EQ("expected string at CustomStruct.str", toString(Root.getError()));
// Optional<T> must parse as the correct type if present.
EXPECT_FALSE(fromJSON(Object{{"str", "1"}, {"int", "string"}}, V, Root));
EXPECT_EQ("expected integer at CustomStruct.int", toString(Root.getError()));
// mapOptional must parse as the correct type if present.
EXPECT_FALSE(fromJSON(Object{{"str", "1"}, {"bool", "string"}}, V, Root));
EXPECT_EQ("expected boolean at CustomStruct.bool", toString(Root.getError()));
}
TEST(JSONTest, ParseDeserialize) {
auto E = parse<std::vector<CustomStruct>>(R"json(
[{"str": "foo", "int": 42}, {"int": 42}]
)json");
EXPECT_THAT_EXPECTED(E, FailedWithMessage("missing value at (root)[1].str"));
E = parse<std::vector<CustomStruct>>(R"json(
[{"str": "foo", "int": 42}, {"str": "bar"}
)json");
EXPECT_THAT_EXPECTED(
E,
FailedWithMessage("[3:2, byte=50]: Expected , or ] after array element"));
E = parse<std::vector<CustomStruct>>(R"json(
[{"str": "foo", "int": 42}]
)json");
EXPECT_THAT_EXPECTED(E, Succeeded());
EXPECT_THAT(*E, testing::SizeIs(1));
}
TEST(JSONTest, Stream) {
auto StreamStuff = [](unsigned Indent) {
std::string S;
llvm::raw_string_ostream OS(S);
OStream J(OS, Indent);
J.comment("top*/level");
J.object([&] {
J.attributeArray("foo", [&] {
J.value(nullptr);
J.comment("element");
J.value(42.5);
J.arrayBegin();
J.value(43);
J.arrayEnd();
J.rawValue([](raw_ostream &OS) { OS << "'unverified\nraw value'"; });
});
J.comment("attribute");
J.attributeBegin("bar");
J.comment("attribute value");
J.objectBegin();
J.objectEnd();
J.attributeEnd();
J.attribute("baz", "xyz");
});
return OS.str();
};
const char *Plain =
R"(/*top* /level*/{"foo":[null,/*element*/42.5,[43],'unverified
raw value'],/*attribute*/"bar":/*attribute value*/{},"baz":"xyz"})";
EXPECT_EQ(Plain, StreamStuff(0));
const char *Pretty = R"(/* top* /level */
{
"foo": [
null,
/* element */
42.5,
[
43
],
'unverified
raw value'
],
/* attribute */
"bar": /* attribute value */ {},
"baz": "xyz"
})";
EXPECT_EQ(Pretty, StreamStuff(2));
}
TEST(JSONTest, Path) {
Path::Root R("foo");
Path P = R, A = P.field("a"), B = P.field("b");
P.report("oh no");
EXPECT_THAT_ERROR(R.getError(), FailedWithMessage("oh no when parsing foo"));
A.index(1).field("c").index(2).report("boom");
EXPECT_THAT_ERROR(R.getError(), FailedWithMessage("boom at foo.a[1].c[2]"));
B.field("d").field("e").report("bam");
EXPECT_THAT_ERROR(R.getError(), FailedWithMessage("bam at foo.b.d.e"));
Value V = Object{
{"a", Array{42}},
{"b",
Object{{"d",
Object{
{"e", Array{1, Object{{"x", "y"}}}},
{"f", "a moderately long string: 48 characters in total"},
}}}},
};
const char *Expected = R"({
"a": [ ... ],
"b": {
"d": {
"e": /* error: bam */ [
1,
{ ... }
],
"f": "a moderately long string: 48 characte..."
}
}
})";
EXPECT_EQ(Expected, errorContext(V, R));
}
} // namespace
} // namespace json
} // namespace llvm
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