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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_reader.h"
#include <utility>
#include <vector>
#include "base/json/json_parser.h"
#include "base/logging.h"
#include "base/optional.h"
#include "base/values.h"
namespace base {
// Chosen to support 99.9% of documents found in the wild late 2016.
// http://crbug.com/673263
const int JSONReader::kStackMaxDepth = 200;
// Values 1000 and above are used by JSONFileValueSerializer::JsonFileError.
static_assert(JSONReader::JSON_PARSE_ERROR_COUNT < 1000,
"JSONReader error out of bounds");
const char JSONReader::kInvalidEscape[] = "Invalid escape sequence.";
const char JSONReader::kSyntaxError[] = "Syntax error.";
const char JSONReader::kUnexpectedToken[] = "Unexpected token.";
const char JSONReader::kTrailingComma[] = "Trailing comma not allowed.";
const char JSONReader::kTooMuchNesting[] = "Too much nesting.";
const char JSONReader::kUnexpectedDataAfterRoot[] =
"Unexpected data after root element.";
const char JSONReader::kUnsupportedEncoding[] =
"Unsupported encoding. JSON must be UTF-8.";
const char JSONReader::kUnquotedDictionaryKey[] =
"Dictionary keys must be quoted.";
const char JSONReader::kInputTooLarge[] = "Input string is too large (>2GB).";
JSONReader::JSONReader(int options, int max_depth)
: parser_(new internal::JSONParser(options, max_depth)) {}
JSONReader::~JSONReader() = default;
// static
std::unique_ptr<Value> JSONReader::Read(StringPiece json,
int options,
int max_depth) {
internal::JSONParser parser(options, max_depth);
Optional<Value> root = parser.Parse(json);
return root ? std::make_unique<Value>(std::move(*root)) : nullptr;
}
// static
std::unique_ptr<Value> JSONReader::ReadAndReturnError(
StringPiece json,
int options,
int* error_code_out,
std::string* error_msg_out,
int* error_line_out,
int* error_column_out) {
internal::JSONParser parser(options);
Optional<Value> root = parser.Parse(json);
if (!root) {
if (error_code_out)
*error_code_out = parser.error_code();
if (error_msg_out)
*error_msg_out = parser.GetErrorMessage();
if (error_line_out)
*error_line_out = parser.error_line();
if (error_column_out)
*error_column_out = parser.error_column();
}
return root ? std::make_unique<Value>(std::move(*root)) : nullptr;
}
// static
std::string JSONReader::ErrorCodeToString(JsonParseError error_code) {
switch (error_code) {
case JSON_NO_ERROR:
return std::string();
case JSON_INVALID_ESCAPE:
return kInvalidEscape;
case JSON_SYNTAX_ERROR:
return kSyntaxError;
case JSON_UNEXPECTED_TOKEN:
return kUnexpectedToken;
case JSON_TRAILING_COMMA:
return kTrailingComma;
case JSON_TOO_MUCH_NESTING:
return kTooMuchNesting;
case JSON_UNEXPECTED_DATA_AFTER_ROOT:
return kUnexpectedDataAfterRoot;
case JSON_UNSUPPORTED_ENCODING:
return kUnsupportedEncoding;
case JSON_UNQUOTED_DICTIONARY_KEY:
return kUnquotedDictionaryKey;
case JSON_TOO_LARGE:
return kInputTooLarge;
case JSON_PARSE_ERROR_COUNT:
break;
}
NOTREACHED();
return std::string();
}
std::unique_ptr<Value> JSONReader::ReadToValue(StringPiece json) {
Optional<Value> value = parser_->Parse(json);
return value ? std::make_unique<Value>(std::move(*value)) : nullptr;
}
JSONReader::JsonParseError JSONReader::error_code() const {
return parser_->error_code();
}
std::string JSONReader::GetErrorMessage() const {
return parser_->GetErrorMessage();
}
} // namespace base
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