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json_parser_unittest.cc
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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_parser.h"
#include "base/json/json_reader.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace internal {
class JSONParserTest : public testing::Test {
public:
JSONParser* NewTestParser(const std::string& input) {
JSONParser* parser = new JSONParser(JSON_PARSE_RFC);
parser->start_pos_ = input.data();
parser->pos_ = parser->start_pos_;
parser->end_pos_ = parser->start_pos_ + input.length();
return parser;
}
void TestLastThree(JSONParser* parser) {
EXPECT_EQ(',', *parser->NextChar());
EXPECT_EQ('|', *parser->NextChar());
EXPECT_EQ('\0', *parser->NextChar());
EXPECT_EQ(parser->end_pos_, parser->pos_);
}
};
TEST_F(JSONParserTest, NextChar) {
std::string input("Hello world");
scoped_ptr<JSONParser> parser(NewTestParser(input));
EXPECT_EQ('H', *parser->pos_);
for (size_t i = 1; i < input.length(); ++i) {
EXPECT_EQ(input[i], *parser->NextChar());
}
EXPECT_EQ(parser->end_pos_, parser->NextChar());
}
TEST_F(JSONParserTest, ConsumeString) {
std::string input("\"test\",|");
scoped_ptr<JSONParser> parser(NewTestParser(input));
scoped_ptr<Value> value(parser->ConsumeString());
EXPECT_EQ('"', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
std::string str;
EXPECT_TRUE(value->GetAsString(&str));
EXPECT_EQ("test", str);
}
TEST_F(JSONParserTest, ConsumeList) {
std::string input("[true, false],|");
scoped_ptr<JSONParser> parser(NewTestParser(input));
scoped_ptr<Value> value(parser->ConsumeList());
EXPECT_EQ(']', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
base::ListValue* list;
EXPECT_TRUE(value->GetAsList(&list));
EXPECT_EQ(2u, list->GetSize());
}
TEST_F(JSONParserTest, ConsumeDictionary) {
std::string input("{\"abc\":\"def\"},|");
scoped_ptr<JSONParser> parser(NewTestParser(input));
scoped_ptr<Value> value(parser->ConsumeDictionary());
EXPECT_EQ('}', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
base::DictionaryValue* dict;
EXPECT_TRUE(value->GetAsDictionary(&dict));
std::string str;
EXPECT_TRUE(dict->GetString("abc", &str));
EXPECT_EQ("def", str);
}
TEST_F(JSONParserTest, ConsumeLiterals) {
// Literal |true|.
std::string input("true,|");
scoped_ptr<JSONParser> parser(NewTestParser(input));
scoped_ptr<Value> value(parser->ConsumeLiteral());
EXPECT_EQ('e', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
bool bool_value = false;
EXPECT_TRUE(value->GetAsBoolean(&bool_value));
EXPECT_TRUE(bool_value);
// Literal |false|.
input = "false,|";
parser.reset(NewTestParser(input));
value.reset(parser->ConsumeLiteral());
EXPECT_EQ('e', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
EXPECT_TRUE(value->GetAsBoolean(&bool_value));
EXPECT_FALSE(bool_value);
// Literal |null|.
input = "null,|";
parser.reset(NewTestParser(input));
value.reset(parser->ConsumeLiteral());
EXPECT_EQ('l', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
EXPECT_TRUE(value->IsType(Value::TYPE_NULL));
}
TEST_F(JSONParserTest, ConsumeNumbers) {
// Integer.
std::string input("1234,|");
scoped_ptr<JSONParser> parser(NewTestParser(input));
scoped_ptr<Value> value(parser->ConsumeNumber());
EXPECT_EQ('4', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
int number_i;
EXPECT_TRUE(value->GetAsInteger(&number_i));
EXPECT_EQ(1234, number_i);
// Negative integer.
input = "-1234,|";
parser.reset(NewTestParser(input));
value.reset(parser->ConsumeNumber());
EXPECT_EQ('4', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
EXPECT_TRUE(value->GetAsInteger(&number_i));
EXPECT_EQ(-1234, number_i);
// Double.
input = "12.34,|";
parser.reset(NewTestParser(input));
value.reset(parser->ConsumeNumber());
EXPECT_EQ('4', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
double number_d;
EXPECT_TRUE(value->GetAsDouble(&number_d));
EXPECT_EQ(12.34, number_d);
// Scientific.
input = "42e3,|";
parser.reset(NewTestParser(input));
value.reset(parser->ConsumeNumber());
EXPECT_EQ('3', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
EXPECT_TRUE(value->GetAsDouble(&number_d));
EXPECT_EQ(42000, number_d);
// Negative scientific.
input = "314159e-5,|";
parser.reset(NewTestParser(input));
value.reset(parser->ConsumeNumber());
EXPECT_EQ('5', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
EXPECT_TRUE(value->GetAsDouble(&number_d));
EXPECT_EQ(3.14159, number_d);
// Positive scientific.
input = "0.42e+3,|";
parser.reset(NewTestParser(input));
value.reset(parser->ConsumeNumber());
EXPECT_EQ('3', *parser->pos_);
TestLastThree(parser.get());
ASSERT_TRUE(value.get());
EXPECT_TRUE(value->GetAsDouble(&number_d));
EXPECT_EQ(420, number_d);
}
TEST_F(JSONParserTest, ErrorMessages) {
// Error strings should not be modified in case of success.
std::string error_message;
int error_code = 0;
scoped_ptr<Value> root;
root.reset(JSONReader::ReadAndReturnError("[42]", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_TRUE(error_message.empty());
EXPECT_EQ(0, error_code);
// Test line and column counting
const char big_json[] = "[\n0,\n1,\n2,\n3,4,5,6 7,\n8,\n9\n]";
// error here ----------------------------------^
root.reset(JSONReader::ReadAndReturnError(big_json, JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(5, 10, JSONReader::kSyntaxError),
error_message);
EXPECT_EQ(JSONReader::JSON_SYNTAX_ERROR, error_code);
error_code = 0;
error_message = "";
// Test line and column counting with "\r\n" line ending
const char big_json_crlf[] =
"[\r\n0,\r\n1,\r\n2,\r\n3,4,5,6 7,\r\n8,\r\n9\r\n]";
// error here ----------------------^
root.reset(JSONReader::ReadAndReturnError(big_json_crlf, JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(5, 10, JSONReader::kSyntaxError),
error_message);
EXPECT_EQ(JSONReader::JSON_SYNTAX_ERROR, error_code);
// Test each of the error conditions
root.reset(JSONReader::ReadAndReturnError("{},{}", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 3,
JSONReader::kUnexpectedDataAfterRoot), error_message);
EXPECT_EQ(JSONReader::JSON_UNEXPECTED_DATA_AFTER_ROOT, error_code);
std::string nested_json;
for (int i = 0; i < 101; ++i) {
nested_json.insert(nested_json.begin(), '[');
nested_json.append(1, ']');
}
root.reset(JSONReader::ReadAndReturnError(nested_json, JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 100, JSONReader::kTooMuchNesting),
error_message);
EXPECT_EQ(JSONReader::JSON_TOO_MUCH_NESTING, error_code);
root.reset(JSONReader::ReadAndReturnError("[1,]", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 4, JSONReader::kTrailingComma),
error_message);
EXPECT_EQ(JSONReader::JSON_TRAILING_COMMA, error_code);
root.reset(JSONReader::ReadAndReturnError("{foo:\"bar\"}", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 2,
JSONReader::kUnquotedDictionaryKey), error_message);
EXPECT_EQ(JSONReader::JSON_UNQUOTED_DICTIONARY_KEY, error_code);
root.reset(JSONReader::ReadAndReturnError("{\"foo\":\"bar\",}",
JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 14, JSONReader::kTrailingComma),
error_message);
root.reset(JSONReader::ReadAndReturnError("[nu]", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 2, JSONReader::kSyntaxError),
error_message);
EXPECT_EQ(JSONReader::JSON_SYNTAX_ERROR, error_code);
root.reset(JSONReader::ReadAndReturnError("[\"xxx\\xq\"]", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 7, JSONReader::kInvalidEscape),
error_message);
EXPECT_EQ(JSONReader::JSON_INVALID_ESCAPE, error_code);
root.reset(JSONReader::ReadAndReturnError("[\"xxx\\uq\"]", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 7, JSONReader::kInvalidEscape),
error_message);
EXPECT_EQ(JSONReader::JSON_INVALID_ESCAPE, error_code);
root.reset(JSONReader::ReadAndReturnError("[\"xxx\\q\"]", JSON_PARSE_RFC,
&error_code, &error_message));
EXPECT_FALSE(root.get());
EXPECT_EQ(JSONParser::FormatErrorMessage(1, 7, JSONReader::kInvalidEscape),
error_message);
EXPECT_EQ(JSONReader::JSON_INVALID_ESCAPE, error_code);
}
TEST_F(JSONParserTest, Decode4ByteUtf8Char) {
// This test strings contains a 4 byte unicode character (a smiley!) that the
// reader should be able to handle (the character is \xf0\x9f\x98\x87).
const char kUtf8Data[] =
"[\"😇\",[],[],[],{\"google:suggesttype\":[]}]";
std::string error_message;
int error_code = 0;
scoped_ptr<Value> root(
JSONReader::ReadAndReturnError(kUtf8Data, JSON_PARSE_RFC, &error_code,
&error_message));
EXPECT_TRUE(root.get()) << error_message;
}
} // namespace internal
} // namespace base