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json
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pull/36/head
Niels 2015-02-05 22:45:21 +01:00
parent a5188b08df
commit 16fa85e9f2
7 changed files with 6678 additions and 8255 deletions
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3
.gitignore vendored
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@ -47,4 +47,5 @@ libjson.a
Testing
.idea
.idea
utf8_test

2
LICENSE.MIT
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@ -1,7 +1,7 @@
The library is licensed under the MIT License
<http://opensource.org/licenses/MIT>:
Copyright (c) 2013-2014 Niels Lohmann
Copyright (c) 2013-2015 Niels Lohmann
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in

14
Makefile.am
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@ -4,12 +4,20 @@ noinst_PROGRAMS = json_unit
FLAGS = -Wall -Wextra -pedantic -Weffc++ -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wmissing-declarations -Wmissing-include-dirs -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-overflow=5 -Wswitch -Wundef -Wno-unused -Wnon-virtual-dtor -Wreorder
json_unit_SOURCES = $(CORE_SOURCES) test/catch.hpp test/unit.cpp src/json.hpp
json_unit_SOURCES = src/json.hpp test/catch.hpp test/unit.cpp
json_unit_CXXFLAGS = $(FLAGS) -std=c++11
json_unit_CPPFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/test -Dprivate=public
# parameters:
# -b use bit vectors
# -s nested ifs
# -i do not create #line information
# --no-generation-date suppress generation date output
src/json.hpp: src/json.hpp.re2c
$(AM_V_GEN)$(RE2C) -b -s -i --no-generation-date $< | $(SED) '1d' > $@
cppcheck:
cppcheck --enable=all --inconclusive --std=c++11 src/json.*
cppcheck --enable=all --inconclusive --std=c++11 src/json.hpp
svn-clean: maintainer-clean
rm -fr configure INSTALL aclocal.m4 build-aux depcomp install-sh missing test-driver
@ -21,4 +29,4 @@ pretty:
--indent-col1-comments --pad-oper --pad-header --align-pointer=type \
--align-reference=type --add-brackets --convert-tabs --close-templates \
--lineend=linux --preserve-date --suffix=none \
$(SOURCES)
src/json.hpp src/json.hpp.re2c test/unit.cpp

6
configure.ac
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@ -1,10 +1,14 @@
AC_INIT([JSON], [3.0], [mail@nlohmann.me])
AC_CONFIG_SRCDIR([src/json.hpp])
AC_CONFIG_SRCDIR([src/json.hpp.re2c])
AM_INIT_AUTOMAKE([foreign subdir-objects])
AM_SILENT_RULES([yes])
AC_PROG_CXX
AC_PROG_SED
AC_PATH_PROG(RE2C, [re2c])
AM_MISSING_PROG(CPPCHECK, [cppcheck])
AM_MISSING_PROG(ASTYLE, [astyle])
AC_CONFIG_FILES(Makefile)
AC_OUTPUT

477
src/json.hpp → src/json.hpp.re2c
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@ -1283,6 +1283,31 @@ class basic_json
}
/////////////////////
// deserialization //
/////////////////////
/// deserialize from string
static basic_json parse(const std::string& s)
{
return parser(s).parse();
}
/// deserialize from stream
friend std::istream& operator>>(std::istream& i, basic_json& j)
{
j = parser(i).parse();
return i;
}
/// deserialize from stream
friend std::istream& operator<<(basic_json& j, std::istream& i)
{
j = parser(i).parse();
return i;
}
private:
///////////////////////////
// convenience functions //
@ -1322,64 +1347,85 @@ class basic_json
}
/*!
Escape a string by replacing special characters by a sequence of an
escape character (backslash) and another character.
@brief escape a string
Escape a string by replacing certain special characters by a sequence of an
escape character (backslash) and another character and other control
characters by a sequence of "\u" followed by a four-digit hex
representation.
@param s the string to escape
@return escaped string
*/
static string_t escape_string(const string_t& s)
static string_t escape_string(const string_t& s) noexcept
{
// create a result string of at least the size than s
string_t result;
result.reserve(s.size());
for (auto c : s)
for (const auto c : s)
{
switch (c)
{
// quotation mark
// quotation mark (0x22)
case '"':
{
result.append("\\\"", 2);
result += "\\\"";
break;
}
// reverse solidus
// reverse solidus (0x5c)
case '\\':
{
result.append("\\\\", 2);
result += "\\\\";
break;
}
// backspace
// backspace (0x08)
case '\b':
{
result.append("\\b", 2);
result += "\\b";
break;
}
// formfeed
// formfeed (0x0c)
case '\f':
{
result.append("\\f", 2);
result += "\\f";
break;
}
// newline
// newline (0x0a)
case '\n':
{
result.append("\\n", 2);
result += "\\n";
break;
}
// carriage return
// carriage return (0x0d)
case '\r':
{
result.append("\\r", 2);
result += "\\r";
break;
}
// horizontal tab
// horizontal tab (0x09)
case '\t':
{
result.append("\\t", 2);
result += "\\t";
break;
}
default:
{
result.append(1, c);
if (c <= 0x1f)
{
// control characters (everything between 0x00 and 0x1f)
// -> create four-digit hex representation
std::stringstream ss;
ss << "\\u" << std::hex << std::setw(4) << std::setfill('0') << int(c);
result += ss.str();
}
else
{
// all other characters are added as-is
result.append(1, c);
}
break;
}
}
}
@ -1387,8 +1433,17 @@ class basic_json
return result;
}
/*!
Internal implementation of the serialization function.
@brief internal implementation of the serialization function
This function is called by the public member function dump and organizes
the serializaion internally. The indentation level is propagated as
additional parameter. In case of arrays and objects, the function is called
recursively. Note that
- strings and object keys are escaped using escape_string()
- numbers are converted to a string before output using std::to_string()
@param prettyPrint whether the output shall be pretty-printed
@param indentStep the indent level
@ -1426,13 +1481,13 @@ class basic_json
result += "\n";
}
for (typename object_t::const_iterator i = m_value.object->begin(); i != m_value.object->end(); ++i)
for (auto i = m_value.object->cbegin(); i != m_value.object->cend(); ++i)
{
if (i != m_value.object->begin())
if (i != m_value.object->cbegin())
{
result += prettyPrint ? ",\n" : ",";
}
result += indent() + "\"" + i->first + "\":" + (prettyPrint ? " " : "")
result += indent() + "\"" + escape_string(i->first) + "\":" + (prettyPrint ? " " : "")
+ i->second.dump(prettyPrint, indentStep, currentIndent);
}
@ -1462,9 +1517,9 @@ class basic_json
result += "\n";
}
for (typename array_t::const_iterator i = m_value.array->begin(); i != m_value.array->end(); ++i)
for (auto i = m_value.array->cbegin(); i != m_value.array->cend(); ++i)
{
if (i != m_value.array->begin())
if (i != m_value.array->cbegin())
{
result += prettyPrint ? ",\n" : ",";
}
@ -2221,6 +2276,365 @@ class basic_json
/// the actual iterator of the associated instance
internal_const_iterator m_it;
};
private:
////////////
// parser //
////////////
class parser
{
private:
/// token types for the parser
enum class token_type
{
uninitialized,
literal_true,
literal_false,
literal_null,
value_string,
value_number,
begin_array,
begin_object,
end_array,
end_object,
name_separator,
value_separator,
parse_error
};
/// the type of a lexer character
using lexer_char_t = unsigned char;
public:
/// constructor for strings
inline parser(const std::string& s) : buffer(s)
{
// set buffer for RE2C
buffer_re2c = reinterpret_cast<const lexer_char_t*>(buffer.c_str());
// set a pointer past the end of the buffer
buffer_re2c_limit = buffer_re2c + buffer.size();
// read first token
get_token();
}
/// a parser reading from an input stream
inline parser(std::istream& _is)
{
while (_is)
{
std::string input_line;
std::getline(_is, input_line);
buffer += input_line;
}
// set buffer for RE2C
buffer_re2c = reinterpret_cast<const lexer_char_t*>(buffer.c_str());
// set a pointer past the end of the buffer
buffer_re2c_limit = buffer_re2c + buffer.size();
// read first token
get_token();
}
inline basic_json parse()
{
switch (last_token)
{
case (token_type::begin_object):
{
// explicitly set result to object to cope with {}
basic_json result(value_t::object);
// read next token
get_token();
// closing } -> we are done
if (last_token == token_type::end_object)
{
return result;
}
// otherwise: parse key-value pairs
do
{
// store key
expect_new(token_type::value_string);
const auto key = get_string();
// parse separator (:)
get_token();
expect_new(token_type::name_separator);
// parse value
get_token();
result[key] = parse();
// read next character
get_token();
}
while (last_token == token_type::value_separator
and get_token() == last_token);
// closing }
expect_new(token_type::end_object);
return result;
}
case (token_type::begin_array):
{
// explicitly set result to object to cope with []
basic_json result(value_t::array);
// read next token
get_token();
// closing ] -> we are done
if (last_token == token_type::end_array)
{
return result;
}
// otherwise: parse values
do
{
// parse value
result.push_back(parse());
// read next character
get_token();
}
while (last_token == token_type::value_separator
and get_token() == last_token);
// closing ]
expect_new(token_type::end_array);
return result;
}
case (token_type::literal_null):
{
return basic_json(nullptr);
}
case (token_type::value_string):
{
return basic_json(get_string());
}
case (token_type::literal_true):
{
return basic_json(true);
}
case (token_type::literal_false):
{
return basic_json(false);
}
case (token_type::value_number):
{
// The pointer current_re2c points to the beginning of the parsed
// number. We pass this pointer to std::strtod which sets endptr
// to the first character past the converted number. If this pointer
// is not the same as buffer_re2c, then either more or less
// characters have been used during the comparison. This can happen
// for inputs like "01" which will be treated like number 0 followed
// by number 1.
// conversion
char* endptr;
const auto float_val = std::strtod(reinterpret_cast<const char*>(current_re2c), &endptr);
// check if strtod read beyond the end of the lexem
if (reinterpret_cast<const lexer_char_t*>(endptr) != buffer_re2c)
{
throw std::invalid_argument(std::string("parse error - ") +
reinterpret_cast<const char*>(current_re2c) + " is not a number");
}
// check if conversion loses precision
const auto int_val = static_cast<int>(float_val);
if (float_val == int_val)
{
// we basic_json not lose precision -> return int
return basic_json(int_val);
}
else
{
// we would lose precision -> returnfloat
return basic_json(float_val);
}
}
default:
{
std::string error_msg = "parse error - unexpected \'";
error_msg += static_cast<char>(current_re2c[0]);
error_msg += "\' (";
error_msg += token_type_name(last_token) + ")";
throw std::invalid_argument(error_msg);
}
}
}
private:
/*!
This function implements a scanner for JSON. It is specified using
regular expressions that try to follow RFC 7159 and ECMA-404 as close
as possible. These regular expressions are then translated into a
deterministic finite automaton (DFA) by the tool RE2C. As a result, the
translated code for this function consists of a large block of code
with goto jumps.
@return the class of the next token read from the buffer
@todo Unicode support needs to be checked.
*/
inline token_type get_token()
{
// needed by RE2C
const lexer_char_t* marker;
// set up RE2C
/*!re2c
re2c:labelprefix = "json_parser_";
re2c:yyfill:enable = 0;
re2c:define:YYCURSOR = buffer_re2c;
re2c:define:YYCTYPE = lexer_char_t;
re2c:define:YYMARKER = marker;
re2c:indent:string = " ";
re2c:define:YYLIMIT = buffer_re2c_limit;
*/
for (;;)
{
// set current to the begin of the buffer
current_re2c = buffer_re2c;
/*!re2c
// whitespace
ws = [ \t\n\r]*;
ws { continue; }
// structural characters
"[" { return last_token = token_type::begin_array; }
"]" { return last_token = token_type::end_array; }
"{" { return last_token = token_type::begin_object; }
"}" { return last_token = token_type::end_object; }
"," { return last_token = token_type::value_separator; }
":" { return last_token = token_type::name_separator; }
// literal names
"null" { return last_token = token_type::literal_null; }
"true" { return last_token = token_type::literal_true; }
"false" { return last_token = token_type::literal_false; }
// number
decimal_point = [.];
digit = [0-9];
digit_1_9 = [1-9];
e = [eE];
minus = [-];
plus = [+];
zero = [0];
exp = e (minus|plus)? digit+;
frac = decimal_point digit+;
int = (zero|digit_1_9 digit*);
number = minus? int frac? exp?;
number { return last_token = token_type::value_number; }
// string
quotation_mark = [\"];
escape = [\\];
unescaped = [^\"\\];
escaped = escape ([\"\\/bfnrt] | [u][0-9a-fA-F]{4});
char = unescaped | escaped;
string = quotation_mark char* quotation_mark;
string { return last_token = token_type::value_string; }
// anything else is an error
* { return last_token = token_type::parse_error; }
*/
}
}
inline std::string token_type_name(token_type t)
{
switch (t)
{
case (token_type::uninitialized):
return "<uninitialized>";
case (token_type::literal_true):
return "true literal";
case (token_type::literal_false):
return "false literal";
case (token_type::literal_null):
return "null literal";
case (token_type::value_string):
return "string literal";
case (token_type::value_number):
return "number literal";
case (token_type::begin_array):
return "[";
case (token_type::begin_object):
return "{";
case (token_type::end_array):
return "]";
case (token_type::end_object):
return "}";
case (token_type::name_separator):
return ":";
case (token_type::value_separator):
return ",";
case (token_type::parse_error):
return "<parse error>";
}
}
inline void expect_new(token_type t)
{
if (t != last_token)
{
std::string error_msg = "parse error - unexpected \'";
error_msg += static_cast<char>(current_re2c[0]);
error_msg += "\' (" + token_type_name(last_token);
error_msg += "); expected " + token_type_name(t);
throw std::invalid_argument(error_msg);
}
}
/*!
The pointer current_re2c points to the opening quote of the string, and
buffer_re2c past the closing quote of the string. We create a std::string from
the character after the opening quotes (current_re2c+1) until the character
before the closing quotes (hence subtracting 2 characters from the pointer
difference of the two pointers).
@return string value of current token without opening and closing quotes
@todo Take care of Unicode.
*/
std::string get_string() const
{
return std::string(
reinterpret_cast<const char*>(current_re2c + 1),
static_cast<std::size_t>(buffer_re2c - current_re2c - 2)
);
}
/// the buffer
std::string buffer;
/// a pointer to the next character to read from the buffer
const lexer_char_t* buffer_re2c = nullptr;
/// a pointer past the last character of the buffer
const lexer_char_t* buffer_re2c_limit = nullptr;
/// a pointer to the beginning of the current token
const lexer_char_t* current_re2c = nullptr;
/// the type of the last read token
token_type last_token = token_type::uninitialized;
};
};
@ -2264,4 +2678,17 @@ struct hash<nlohmann::json>
};
}
/*!
This operator implements a user-defined string literal for JSON objects. It can
be used by adding \p "_json" to a string literal and returns a JSON object if
no parse error occurred.
@param s a string representation of a JSON object
@return a JSON object
*/
nlohmann::json operator "" _json(const char* s, std::size_t)
{
return nlohmann::json::parse(s);
}
#endif

14416
test/catch.hpp
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File diff suppressed because it is too large Load Diff

15
test/unit.cpp
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@ -9,6 +9,11 @@
using nlohmann::json;
TEST_CASE()
{
CHECK(json::parser("[1,2,3,4,5,6]").parse().dump() == "[1,2,3,4,5,6]");
}
TEST_CASE()
{
CHECK(json::escape_string("\\") == "\\\\");
@ -18,12 +23,18 @@ TEST_CASE()
CHECK(json::escape_string("\f") == "\\f");
CHECK(json::escape_string("\b") == "\\b");
CHECK(json::escape_string("\t") == "\\t");
CHECK(json::escape_string("Lorem ipsum \"dolor\" sit amet,\nconsectetur \\ adipiscing elit.")
== "Lorem ipsum \\\"dolor\\\" sit amet,\\nconsectetur \\\\ adipiscing elit.");
CHECK(json::escape_string("the main said, \"cool!\"") == "the main said, \\\"cool!\\\"");
CHECK(json::escape_string("\a") == "\\u0007");
CHECK(json::escape_string("\v") == "\\u000b");
{
json j = "AC/DC";
CHECK(j.dump() == "\"AC/DC\"");
}
{
json j = {1, 2, 3, 4};
std::cerr << j << std::endl;