| // Copyright 2012 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/json/json_writer.h" |
| #include "base/json/json_reader.h" |
| |
| #include "base/containers/span.h" |
| #include "base/memory/ptr_util.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/values.h" |
| #include "build/build_config.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace base { |
| |
| TEST(JSONWriterTest, BasicTypes) { |
| std::string output_js; |
| |
| // Test null. |
| EXPECT_TRUE(JSONWriter::Write(Value(), &output_js)); |
| EXPECT_EQ("null", output_js); |
| |
| // Test empty dict. |
| EXPECT_TRUE(JSONWriter::Write(Value(Value::Type::DICTIONARY), &output_js)); |
| EXPECT_EQ("{}", output_js); |
| |
| // Test empty list. |
| EXPECT_TRUE(JSONWriter::Write(Value(Value::Type::LIST), &output_js)); |
| EXPECT_EQ("[]", output_js); |
| |
| // Test integer values. |
| EXPECT_TRUE(JSONWriter::Write(Value(42), &output_js)); |
| EXPECT_EQ("42", output_js); |
| |
| // Test boolean values. |
| EXPECT_TRUE(JSONWriter::Write(Value(true), &output_js)); |
| EXPECT_EQ("true", output_js); |
| |
| // Test Real values should always have a decimal or an 'e'. |
| EXPECT_TRUE(JSONWriter::Write(Value(1.0), &output_js)); |
| EXPECT_EQ("1.0", output_js); |
| |
| // Test Real values in the range (-1, 1) must have leading zeros |
| EXPECT_TRUE(JSONWriter::Write(Value(0.2), &output_js)); |
| EXPECT_EQ("0.2", output_js); |
| |
| // Test Real values in the range (-1, 1) must have leading zeros |
| EXPECT_TRUE(JSONWriter::Write(Value(-0.8), &output_js)); |
| EXPECT_EQ("-0.8", output_js); |
| |
| // Test String values. |
| EXPECT_TRUE(JSONWriter::Write(Value("foo"), &output_js)); |
| EXPECT_EQ("\"foo\"", output_js); |
| } |
| |
| TEST(JSONWriterTest, NestedTypes) { |
| std::string output_js; |
| |
| // Writer unittests like empty list/dict nesting, |
| // list list nesting, etc. |
| Value::Dict root_dict; |
| Value::List list; |
| Value::Dict inner_dict; |
| inner_dict.Set("inner int", 10); |
| list.Append(std::move(inner_dict)); |
| Value::Dict empty_dict; |
| list.Append(std::move(empty_dict)); |
| list.Append(Value::List()); |
| list.Append(true); |
| root_dict.Set("list", Value(std::move(list))); |
| |
| // The pretty-printer uses a different newline style on Windows than on |
| // other platforms. |
| #if BUILDFLAG(IS_WIN) |
| #define JSON_NEWLINE "\r\n" |
| #else |
| #define JSON_NEWLINE "\n" |
| #endif |
| |
| // Test the pretty-printer. |
| EXPECT_TRUE(JSONWriter::Write(root_dict, &output_js)); |
| EXPECT_EQ("{\"list\":[{\"inner int\":10},{},[],true]}", output_js); |
| EXPECT_TRUE(JSONWriter::WriteWithOptions( |
| root_dict, JSONWriter::OPTIONS_PRETTY_PRINT, &output_js)); |
| EXPECT_EQ("{" JSON_NEWLINE " \"list\": [ {" JSON_NEWLINE |
| " \"inner int\": 10" JSON_NEWLINE " }, {" JSON_NEWLINE |
| " }, [ ], true ]" JSON_NEWLINE "}" JSON_NEWLINE, |
| output_js); |
| |
| #undef JSON_NEWLINE |
| } |
| |
| TEST(JSONWriterTest, KeysWithPeriods) { |
| std::string output_js; |
| |
| Value::Dict period_dict; |
| period_dict.Set("a.b", 3); |
| period_dict.Set("c", 2); |
| Value::Dict period_dict2; |
| period_dict2.Set("g.h.i.j", 1); |
| period_dict.Set("d.e.f", std::move(period_dict2)); |
| EXPECT_TRUE(JSONWriter::Write(period_dict, &output_js)); |
| EXPECT_EQ("{\"a.b\":3,\"c\":2,\"d.e.f\":{\"g.h.i.j\":1}}", output_js); |
| |
| Value::Dict period_dict3; |
| period_dict3.SetByDottedPath("a.b", 2); |
| period_dict3.Set("a.b", 1); |
| EXPECT_TRUE(JSONWriter::Write(period_dict3, &output_js)); |
| EXPECT_EQ("{\"a\":{\"b\":2},\"a.b\":1}", output_js); |
| } |
| |
| TEST(JSONWriterTest, BinaryValues) { |
| std::string output_js; |
| |
| // Binary values should return errors unless suppressed via the |
| // OPTIONS_OMIT_BINARY_VALUES flag. |
| const auto kBufferSpan = |
| base::make_span(reinterpret_cast<const uint8_t*>("asdf"), 4); |
| Value root(kBufferSpan); |
| EXPECT_FALSE(JSONWriter::Write(root, &output_js)); |
| EXPECT_TRUE(JSONWriter::WriteWithOptions( |
| root, JSONWriter::OPTIONS_OMIT_BINARY_VALUES, &output_js)); |
| EXPECT_TRUE(output_js.empty()); |
| |
| Value::List binary_list; |
| binary_list.Append(Value(kBufferSpan)); |
| binary_list.Append(5); |
| binary_list.Append(Value(kBufferSpan)); |
| binary_list.Append(2); |
| binary_list.Append(Value(kBufferSpan)); |
| EXPECT_FALSE(JSONWriter::Write(binary_list, &output_js)); |
| EXPECT_TRUE(JSONWriter::WriteWithOptions( |
| binary_list, JSONWriter::OPTIONS_OMIT_BINARY_VALUES, &output_js)); |
| EXPECT_EQ("[5,2]", output_js); |
| |
| Value::Dict binary_dict; |
| binary_dict.Set("a", Value(kBufferSpan)); |
| binary_dict.Set("b", 5); |
| binary_dict.Set("c", Value(kBufferSpan)); |
| binary_dict.Set("d", 2); |
| binary_dict.Set("e", Value(kBufferSpan)); |
| EXPECT_FALSE(JSONWriter::Write(binary_dict, &output_js)); |
| EXPECT_TRUE(JSONWriter::WriteWithOptions( |
| binary_dict, JSONWriter::OPTIONS_OMIT_BINARY_VALUES, &output_js)); |
| EXPECT_EQ("{\"b\":5,\"d\":2}", output_js); |
| } |
| |
| TEST(JSONWriterTest, DoublesAsInts) { |
| std::string output_js; |
| |
| // Test allowing a double with no fractional part to be written as an integer. |
| Value double_value(1e10); |
| EXPECT_TRUE(JSONWriter::WriteWithOptions( |
| double_value, JSONWriter::OPTIONS_OMIT_DOUBLE_TYPE_PRESERVATION, |
| &output_js)); |
| EXPECT_EQ("10000000000", output_js); |
| } |
| |
| TEST(JSONWriterTest, StackOverflow) { |
| std::string output_js; |
| |
| Value::List deep_list; |
| const size_t max_depth = 100000; |
| |
| for (size_t i = 0; i < max_depth; ++i) { |
| Value::List new_top_list; |
| new_top_list.Append(std::move(deep_list)); |
| deep_list = std::move(new_top_list); |
| } |
| |
| Value deep_list_value(std::move(deep_list)); |
| EXPECT_FALSE(JSONWriter::Write(deep_list_value, &output_js)); |
| EXPECT_FALSE(JSONWriter::WriteWithOptions( |
| deep_list_value, JSONWriter::OPTIONS_PRETTY_PRINT, &output_js)); |
| |
| // We cannot just let deep_list tear down since it |
| // would cause a stack overflow. Therefore, we tear |
| // down the deep list manually. |
| deep_list = std::move(deep_list_value).TakeList(); |
| while (!deep_list.empty()) { |
| DCHECK_EQ(deep_list.size(), 1u); |
| Value::List inner_list = std::move(deep_list[0]).TakeList(); |
| deep_list = std::move(inner_list); |
| } |
| } |
| |
| TEST(JSONWriterTest, TestMaxDepthWithValidNodes) { |
| // Create JSON to the max depth - 1. Nodes at that depth are still valid |
| // for writing which matches the JSONParser logic. |
| std::string nested_json; |
| for (int i = 0; i < 199; ++i) { |
| std::string node = "["; |
| for (int j = 0; j < 5; j++) { |
| node.append(StringPrintf("%d,", j)); |
| } |
| nested_json.insert(0, node); |
| nested_json.append("]"); |
| } |
| |
| // Ensure we can read and write the JSON |
| auto json_val = JSONReader::ReadAndReturnValueWithError( |
| nested_json, JSON_ALLOW_TRAILING_COMMAS); |
| EXPECT_TRUE(json_val.has_value()); |
| const Value& value = *json_val; |
| std::string serialized; |
| EXPECT_TRUE(JSONWriter::Write(value, &serialized)); |
| } |
| |
| } // namespace base |