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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // 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.GetList());
- while (!deep_list.empty()) {
- DCHECK_EQ(deep_list.size(), 1u);
- Value::List inner_list = std::move(deep_list[0].GetList());
- 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
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