deps: Add json11 library for convenience
Adds a very basic and easy-to-use C++ library strictly for the sake of convenience when using C++.master
jp9000
parent
2d60c89a02
commit
28e3604a56
|
|
@ -0,0 +1,19 @@
|
|||
Copyright (c) 2013 Dropbox, Inc.
|
||||
|
||||
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 the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in
|
||||
all copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
THE SOFTWARE.
|
||||
|
|
@ -0,0 +1,788 @@
|
|||
/* Copyright (c) 2013 Dropbox, Inc.
|
||||
*
|
||||
* 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 the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
#include "json11.hpp"
|
||||
#include <cassert>
|
||||
#include <cmath>
|
||||
#include <cstdlib>
|
||||
#include <cstdio>
|
||||
#include <limits>
|
||||
|
||||
namespace json11 {
|
||||
|
||||
static const int max_depth = 200;
|
||||
|
||||
using std::string;
|
||||
using std::vector;
|
||||
using std::map;
|
||||
using std::make_shared;
|
||||
using std::initializer_list;
|
||||
using std::move;
|
||||
|
||||
/* Helper for representing null - just a do-nothing struct, plus comparison
|
||||
* operators so the helpers in JsonValue work. We can't use nullptr_t because
|
||||
* it may not be orderable.
|
||||
*/
|
||||
struct NullStruct {
|
||||
bool operator==(NullStruct) const { return true; }
|
||||
bool operator<(NullStruct) const { return false; }
|
||||
};
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Serialization
|
||||
*/
|
||||
|
||||
static void dump(NullStruct, string &out) {
|
||||
out += "null";
|
||||
}
|
||||
|
||||
static void dump(double value, string &out) {
|
||||
if (std::isfinite(value)) {
|
||||
char buf[32];
|
||||
snprintf(buf, sizeof buf, "%.17g", value);
|
||||
out += buf;
|
||||
} else {
|
||||
out += "null";
|
||||
}
|
||||
}
|
||||
|
||||
static void dump(int value, string &out) {
|
||||
char buf[32];
|
||||
snprintf(buf, sizeof buf, "%d", value);
|
||||
out += buf;
|
||||
}
|
||||
|
||||
static void dump(bool value, string &out) {
|
||||
out += value ? "true" : "false";
|
||||
}
|
||||
|
||||
static void dump(const string &value, string &out) {
|
||||
out += '"';
|
||||
for (size_t i = 0; i < value.length(); i++) {
|
||||
const char ch = value[i];
|
||||
if (ch == '\\') {
|
||||
out += "\\\\";
|
||||
} else if (ch == '"') {
|
||||
out += "\\\"";
|
||||
} else if (ch == '\b') {
|
||||
out += "\\b";
|
||||
} else if (ch == '\f') {
|
||||
out += "\\f";
|
||||
} else if (ch == '\n') {
|
||||
out += "\\n";
|
||||
} else if (ch == '\r') {
|
||||
out += "\\r";
|
||||
} else if (ch == '\t') {
|
||||
out += "\\t";
|
||||
} else if (static_cast<uint8_t>(ch) <= 0x1f) {
|
||||
char buf[8];
|
||||
snprintf(buf, sizeof buf, "\\u%04x", ch);
|
||||
out += buf;
|
||||
} else if (static_cast<uint8_t>(ch) == 0xe2 && static_cast<uint8_t>(value[i+1]) == 0x80
|
||||
&& static_cast<uint8_t>(value[i+2]) == 0xa8) {
|
||||
out += "\\u2028";
|
||||
i += 2;
|
||||
} else if (static_cast<uint8_t>(ch) == 0xe2 && static_cast<uint8_t>(value[i+1]) == 0x80
|
||||
&& static_cast<uint8_t>(value[i+2]) == 0xa9) {
|
||||
out += "\\u2029";
|
||||
i += 2;
|
||||
} else {
|
||||
out += ch;
|
||||
}
|
||||
}
|
||||
out += '"';
|
||||
}
|
||||
|
||||
static void dump(const Json::array &values, string &out) {
|
||||
bool first = true;
|
||||
out += "[";
|
||||
for (const auto &value : values) {
|
||||
if (!first)
|
||||
out += ", ";
|
||||
value.dump(out);
|
||||
first = false;
|
||||
}
|
||||
out += "]";
|
||||
}
|
||||
|
||||
static void dump(const Json::object &values, string &out) {
|
||||
bool first = true;
|
||||
out += "{";
|
||||
for (const auto &kv : values) {
|
||||
if (!first)
|
||||
out += ", ";
|
||||
dump(kv.first, out);
|
||||
out += ": ";
|
||||
kv.second.dump(out);
|
||||
first = false;
|
||||
}
|
||||
out += "}";
|
||||
}
|
||||
|
||||
void Json::dump(string &out) const {
|
||||
m_ptr->dump(out);
|
||||
}
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Value wrappers
|
||||
*/
|
||||
|
||||
template <Json::Type tag, typename T>
|
||||
class Value : public JsonValue {
|
||||
protected:
|
||||
|
||||
// Constructors
|
||||
explicit Value(const T &value) : m_value(value) {}
|
||||
explicit Value(T &&value) : m_value(move(value)) {}
|
||||
|
||||
// Get type tag
|
||||
Json::Type type() const override {
|
||||
return tag;
|
||||
}
|
||||
|
||||
// Comparisons
|
||||
bool equals(const JsonValue * other) const override {
|
||||
return m_value == static_cast<const Value<tag, T> *>(other)->m_value;
|
||||
}
|
||||
bool less(const JsonValue * other) const override {
|
||||
return m_value < static_cast<const Value<tag, T> *>(other)->m_value;
|
||||
}
|
||||
|
||||
const T m_value;
|
||||
void dump(string &out) const override { json11::dump(m_value, out); }
|
||||
};
|
||||
|
||||
class JsonDouble final : public Value<Json::NUMBER, double> {
|
||||
double number_value() const override { return m_value; }
|
||||
int int_value() const override { return static_cast<int>(m_value); }
|
||||
bool equals(const JsonValue * other) const override { return m_value == other->number_value(); }
|
||||
bool less(const JsonValue * other) const override { return m_value < other->number_value(); }
|
||||
public:
|
||||
explicit JsonDouble(double value) : Value(value) {}
|
||||
};
|
||||
|
||||
class JsonInt final : public Value<Json::NUMBER, int> {
|
||||
double number_value() const override { return m_value; }
|
||||
int int_value() const override { return m_value; }
|
||||
bool equals(const JsonValue * other) const override { return m_value == other->number_value(); }
|
||||
bool less(const JsonValue * other) const override { return m_value < other->number_value(); }
|
||||
public:
|
||||
explicit JsonInt(int value) : Value(value) {}
|
||||
};
|
||||
|
||||
class JsonBoolean final : public Value<Json::BOOL, bool> {
|
||||
bool bool_value() const override { return m_value; }
|
||||
public:
|
||||
explicit JsonBoolean(bool value) : Value(value) {}
|
||||
};
|
||||
|
||||
class JsonString final : public Value<Json::STRING, string> {
|
||||
const string &string_value() const override { return m_value; }
|
||||
public:
|
||||
explicit JsonString(const string &value) : Value(value) {}
|
||||
explicit JsonString(string &&value) : Value(move(value)) {}
|
||||
};
|
||||
|
||||
class JsonArray final : public Value<Json::ARRAY, Json::array> {
|
||||
const Json::array &array_items() const override { return m_value; }
|
||||
const Json & operator[](size_t i) const override;
|
||||
public:
|
||||
explicit JsonArray(const Json::array &value) : Value(value) {}
|
||||
explicit JsonArray(Json::array &&value) : Value(move(value)) {}
|
||||
};
|
||||
|
||||
class JsonObject final : public Value<Json::OBJECT, Json::object> {
|
||||
const Json::object &object_items() const override { return m_value; }
|
||||
const Json & operator[](const string &key) const override;
|
||||
public:
|
||||
explicit JsonObject(const Json::object &value) : Value(value) {}
|
||||
explicit JsonObject(Json::object &&value) : Value(move(value)) {}
|
||||
};
|
||||
|
||||
class JsonNull final : public Value<Json::NUL, NullStruct> {
|
||||
public:
|
||||
JsonNull() : Value({}) {}
|
||||
};
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Static globals - static-init-safe
|
||||
*/
|
||||
struct Statics {
|
||||
const std::shared_ptr<JsonValue> null = make_shared<JsonNull>();
|
||||
const std::shared_ptr<JsonValue> t = make_shared<JsonBoolean>(true);
|
||||
const std::shared_ptr<JsonValue> f = make_shared<JsonBoolean>(false);
|
||||
const string empty_string;
|
||||
const vector<Json> empty_vector;
|
||||
const map<string, Json> empty_map;
|
||||
Statics() {}
|
||||
};
|
||||
|
||||
static const Statics & statics() {
|
||||
static const Statics s {};
|
||||
return s;
|
||||
}
|
||||
|
||||
static const Json & static_null() {
|
||||
// This has to be separate, not in Statics, because Json() accesses statics().null.
|
||||
static const Json json_null;
|
||||
return json_null;
|
||||
}
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Constructors
|
||||
*/
|
||||
|
||||
Json::Json() noexcept : m_ptr(statics().null) {}
|
||||
Json::Json(std::nullptr_t) noexcept : m_ptr(statics().null) {}
|
||||
Json::Json(double value) : m_ptr(make_shared<JsonDouble>(value)) {}
|
||||
Json::Json(int value) : m_ptr(make_shared<JsonInt>(value)) {}
|
||||
Json::Json(bool value) : m_ptr(value ? statics().t : statics().f) {}
|
||||
Json::Json(const string &value) : m_ptr(make_shared<JsonString>(value)) {}
|
||||
Json::Json(string &&value) : m_ptr(make_shared<JsonString>(move(value))) {}
|
||||
Json::Json(const char * value) : m_ptr(make_shared<JsonString>(value)) {}
|
||||
Json::Json(const Json::array &values) : m_ptr(make_shared<JsonArray>(values)) {}
|
||||
Json::Json(Json::array &&values) : m_ptr(make_shared<JsonArray>(move(values))) {}
|
||||
Json::Json(const Json::object &values) : m_ptr(make_shared<JsonObject>(values)) {}
|
||||
Json::Json(Json::object &&values) : m_ptr(make_shared<JsonObject>(move(values))) {}
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Accessors
|
||||
*/
|
||||
|
||||
Json::Type Json::type() const { return m_ptr->type(); }
|
||||
double Json::number_value() const { return m_ptr->number_value(); }
|
||||
int Json::int_value() const { return m_ptr->int_value(); }
|
||||
bool Json::bool_value() const { return m_ptr->bool_value(); }
|
||||
const string & Json::string_value() const { return m_ptr->string_value(); }
|
||||
const vector<Json> & Json::array_items() const { return m_ptr->array_items(); }
|
||||
const map<string, Json> & Json::object_items() const { return m_ptr->object_items(); }
|
||||
const Json & Json::operator[] (size_t i) const { return (*m_ptr)[i]; }
|
||||
const Json & Json::operator[] (const string &key) const { return (*m_ptr)[key]; }
|
||||
|
||||
double JsonValue::number_value() const { return 0; }
|
||||
int JsonValue::int_value() const { return 0; }
|
||||
bool JsonValue::bool_value() const { return false; }
|
||||
const string & JsonValue::string_value() const { return statics().empty_string; }
|
||||
const vector<Json> & JsonValue::array_items() const { return statics().empty_vector; }
|
||||
const map<string, Json> & JsonValue::object_items() const { return statics().empty_map; }
|
||||
const Json & JsonValue::operator[] (size_t) const { return static_null(); }
|
||||
const Json & JsonValue::operator[] (const string &) const { return static_null(); }
|
||||
|
||||
const Json & JsonObject::operator[] (const string &key) const {
|
||||
auto iter = m_value.find(key);
|
||||
return (iter == m_value.end()) ? static_null() : iter->second;
|
||||
}
|
||||
const Json & JsonArray::operator[] (size_t i) const {
|
||||
if (i >= m_value.size()) return static_null();
|
||||
else return m_value[i];
|
||||
}
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Comparison
|
||||
*/
|
||||
|
||||
bool Json::operator== (const Json &other) const {
|
||||
if (m_ptr == other.m_ptr)
|
||||
return true;
|
||||
if (m_ptr->type() != other.m_ptr->type())
|
||||
return false;
|
||||
|
||||
return m_ptr->equals(other.m_ptr.get());
|
||||
}
|
||||
|
||||
bool Json::operator< (const Json &other) const {
|
||||
if (m_ptr == other.m_ptr)
|
||||
return false;
|
||||
if (m_ptr->type() != other.m_ptr->type())
|
||||
return m_ptr->type() < other.m_ptr->type();
|
||||
|
||||
return m_ptr->less(other.m_ptr.get());
|
||||
}
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Parsing
|
||||
*/
|
||||
|
||||
/* esc(c)
|
||||
*
|
||||
* Format char c suitable for printing in an error message.
|
||||
*/
|
||||
static inline string esc(char c) {
|
||||
char buf[12];
|
||||
if (static_cast<uint8_t>(c) >= 0x20 && static_cast<uint8_t>(c) <= 0x7f) {
|
||||
snprintf(buf, sizeof buf, "'%c' (%d)", c, c);
|
||||
} else {
|
||||
snprintf(buf, sizeof buf, "(%d)", c);
|
||||
}
|
||||
return string(buf);
|
||||
}
|
||||
|
||||
static inline bool in_range(long x, long lower, long upper) {
|
||||
return (x >= lower && x <= upper);
|
||||
}
|
||||
|
||||
namespace {
|
||||
/* JsonParser
|
||||
*
|
||||
* Object that tracks all state of an in-progress parse.
|
||||
*/
|
||||
struct JsonParser final {
|
||||
|
||||
/* State
|
||||
*/
|
||||
const string &str;
|
||||
size_t i;
|
||||
string &err;
|
||||
bool failed;
|
||||
const JsonParse strategy;
|
||||
|
||||
/* fail(msg, err_ret = Json())
|
||||
*
|
||||
* Mark this parse as failed.
|
||||
*/
|
||||
Json fail(string &&msg) {
|
||||
return fail(move(msg), Json());
|
||||
}
|
||||
|
||||
template <typename T>
|
||||
T fail(string &&msg, const T err_ret) {
|
||||
if (!failed)
|
||||
err = std::move(msg);
|
||||
failed = true;
|
||||
return err_ret;
|
||||
}
|
||||
|
||||
/* consume_whitespace()
|
||||
*
|
||||
* Advance until the current character is non-whitespace.
|
||||
*/
|
||||
void consume_whitespace() {
|
||||
while (str[i] == ' ' || str[i] == '\r' || str[i] == '\n' || str[i] == '\t')
|
||||
i++;
|
||||
}
|
||||
|
||||
/* consume_comment()
|
||||
*
|
||||
* Advance comments (c-style inline and multiline).
|
||||
*/
|
||||
bool consume_comment() {
|
||||
bool comment_found = false;
|
||||
if (str[i] == '/') {
|
||||
i++;
|
||||
if (i == str.size())
|
||||
return fail("unexpected end of input after start of comment", false);
|
||||
if (str[i] == '/') { // inline comment
|
||||
i++;
|
||||
// advance until next line, or end of input
|
||||
while (i < str.size() && str[i] != '\n') {
|
||||
i++;
|
||||
}
|
||||
comment_found = true;
|
||||
}
|
||||
else if (str[i] == '*') { // multiline comment
|
||||
i++;
|
||||
if (i > str.size()-2)
|
||||
return fail("unexpected end of input inside multi-line comment", false);
|
||||
// advance until closing tokens
|
||||
while (!(str[i] == '*' && str[i+1] == '/')) {
|
||||
i++;
|
||||
if (i > str.size()-2)
|
||||
return fail(
|
||||
"unexpected end of input inside multi-line comment", false);
|
||||
}
|
||||
i += 2;
|
||||
comment_found = true;
|
||||
}
|
||||
else
|
||||
return fail("malformed comment", false);
|
||||
}
|
||||
return comment_found;
|
||||
}
|
||||
|
||||
/* consume_garbage()
|
||||
*
|
||||
* Advance until the current character is non-whitespace and non-comment.
|
||||
*/
|
||||
void consume_garbage() {
|
||||
consume_whitespace();
|
||||
if(strategy == JsonParse::COMMENTS) {
|
||||
bool comment_found = false;
|
||||
do {
|
||||
comment_found = consume_comment();
|
||||
if (failed) return;
|
||||
consume_whitespace();
|
||||
}
|
||||
while(comment_found);
|
||||
}
|
||||
}
|
||||
|
||||
/* get_next_token()
|
||||
*
|
||||
* Return the next non-whitespace character. If the end of the input is reached,
|
||||
* flag an error and return 0.
|
||||
*/
|
||||
char get_next_token() {
|
||||
consume_garbage();
|
||||
if (failed) return (char)0;
|
||||
if (i == str.size())
|
||||
return fail("unexpected end of input", (char)0);
|
||||
|
||||
return str[i++];
|
||||
}
|
||||
|
||||
/* encode_utf8(pt, out)
|
||||
*
|
||||
* Encode pt as UTF-8 and add it to out.
|
||||
*/
|
||||
void encode_utf8(long pt, string & out) {
|
||||
if (pt < 0)
|
||||
return;
|
||||
|
||||
if (pt < 0x80) {
|
||||
out += static_cast<char>(pt);
|
||||
} else if (pt < 0x800) {
|
||||
out += static_cast<char>((pt >> 6) | 0xC0);
|
||||
out += static_cast<char>((pt & 0x3F) | 0x80);
|
||||
} else if (pt < 0x10000) {
|
||||
out += static_cast<char>((pt >> 12) | 0xE0);
|
||||
out += static_cast<char>(((pt >> 6) & 0x3F) | 0x80);
|
||||
out += static_cast<char>((pt & 0x3F) | 0x80);
|
||||
} else {
|
||||
out += static_cast<char>((pt >> 18) | 0xF0);
|
||||
out += static_cast<char>(((pt >> 12) & 0x3F) | 0x80);
|
||||
out += static_cast<char>(((pt >> 6) & 0x3F) | 0x80);
|
||||
out += static_cast<char>((pt & 0x3F) | 0x80);
|
||||
}
|
||||
}
|
||||
|
||||
/* parse_string()
|
||||
*
|
||||
* Parse a string, starting at the current position.
|
||||
*/
|
||||
string parse_string() {
|
||||
string out;
|
||||
long last_escaped_codepoint = -1;
|
||||
while (true) {
|
||||
if (i == str.size())
|
||||
return fail("unexpected end of input in string", "");
|
||||
|
||||
char ch = str[i++];
|
||||
|
||||
if (ch == '"') {
|
||||
encode_utf8(last_escaped_codepoint, out);
|
||||
return out;
|
||||
}
|
||||
|
||||
if (in_range(ch, 0, 0x1f))
|
||||
return fail("unescaped " + esc(ch) + " in string", "");
|
||||
|
||||
// The usual case: non-escaped characters
|
||||
if (ch != '\\') {
|
||||
encode_utf8(last_escaped_codepoint, out);
|
||||
last_escaped_codepoint = -1;
|
||||
out += ch;
|
||||
continue;
|
||||
}
|
||||
|
||||
// Handle escapes
|
||||
if (i == str.size())
|
||||
return fail("unexpected end of input in string", "");
|
||||
|
||||
ch = str[i++];
|
||||
|
||||
if (ch == 'u') {
|
||||
// Extract 4-byte escape sequence
|
||||
string esc = str.substr(i, 4);
|
||||
// Explicitly check length of the substring. The following loop
|
||||
// relies on std::string returning the terminating NUL when
|
||||
// accessing str[length]. Checking here reduces brittleness.
|
||||
if (esc.length() < 4) {
|
||||
return fail("bad \\u escape: " + esc, "");
|
||||
}
|
||||
for (size_t j = 0; j < 4; j++) {
|
||||
if (!in_range(esc[j], 'a', 'f') && !in_range(esc[j], 'A', 'F')
|
||||
&& !in_range(esc[j], '0', '9'))
|
||||
return fail("bad \\u escape: " + esc, "");
|
||||
}
|
||||
|
||||
long codepoint = strtol(esc.data(), nullptr, 16);
|
||||
|
||||
// JSON specifies that characters outside the BMP shall be encoded as a pair
|
||||
// of 4-hex-digit \u escapes encoding their surrogate pair components. Check
|
||||
// whether we're in the middle of such a beast: the previous codepoint was an
|
||||
// escaped lead (high) surrogate, and this is a trail (low) surrogate.
|
||||
if (in_range(last_escaped_codepoint, 0xD800, 0xDBFF)
|
||||
&& in_range(codepoint, 0xDC00, 0xDFFF)) {
|
||||
// Reassemble the two surrogate pairs into one astral-plane character, per
|
||||
// the UTF-16 algorithm.
|
||||
encode_utf8((((last_escaped_codepoint - 0xD800) << 10)
|
||||
| (codepoint - 0xDC00)) + 0x10000, out);
|
||||
last_escaped_codepoint = -1;
|
||||
} else {
|
||||
encode_utf8(last_escaped_codepoint, out);
|
||||
last_escaped_codepoint = codepoint;
|
||||
}
|
||||
|
||||
i += 4;
|
||||
continue;
|
||||
}
|
||||
|
||||
encode_utf8(last_escaped_codepoint, out);
|
||||
last_escaped_codepoint = -1;
|
||||
|
||||
if (ch == 'b') {
|
||||
out += '\b';
|
||||
} else if (ch == 'f') {
|
||||
out += '\f';
|
||||
} else if (ch == 'n') {
|
||||
out += '\n';
|
||||
} else if (ch == 'r') {
|
||||
out += '\r';
|
||||
} else if (ch == 't') {
|
||||
out += '\t';
|
||||
} else if (ch == '"' || ch == '\\' || ch == '/') {
|
||||
out += ch;
|
||||
} else {
|
||||
return fail("invalid escape character " + esc(ch), "");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* parse_number()
|
||||
*
|
||||
* Parse a double.
|
||||
*/
|
||||
Json parse_number() {
|
||||
size_t start_pos = i;
|
||||
|
||||
if (str[i] == '-')
|
||||
i++;
|
||||
|
||||
// Integer part
|
||||
if (str[i] == '0') {
|
||||
i++;
|
||||
if (in_range(str[i], '0', '9'))
|
||||
return fail("leading 0s not permitted in numbers");
|
||||
} else if (in_range(str[i], '1', '9')) {
|
||||
i++;
|
||||
while (in_range(str[i], '0', '9'))
|
||||
i++;
|
||||
} else {
|
||||
return fail("invalid " + esc(str[i]) + " in number");
|
||||
}
|
||||
|
||||
if (str[i] != '.' && str[i] != 'e' && str[i] != 'E'
|
||||
&& (i - start_pos) <= static_cast<size_t>(std::numeric_limits<int>::digits10)) {
|
||||
return std::atoi(str.c_str() + start_pos);
|
||||
}
|
||||
|
||||
// Decimal part
|
||||
if (str[i] == '.') {
|
||||
i++;
|
||||
if (!in_range(str[i], '0', '9'))
|
||||
return fail("at least one digit required in fractional part");
|
||||
|
||||
while (in_range(str[i], '0', '9'))
|
||||
i++;
|
||||
}
|
||||
|
||||
// Exponent part
|
||||
if (str[i] == 'e' || str[i] == 'E') {
|
||||
i++;
|
||||
|
||||
if (str[i] == '+' || str[i] == '-')
|
||||
i++;
|
||||
|
||||
if (!in_range(str[i], '0', '9'))
|
||||
return fail("at least one digit required in exponent");
|
||||
|
||||
while (in_range(str[i], '0', '9'))
|
||||
i++;
|
||||
}
|
||||
|
||||
return std::strtod(str.c_str() + start_pos, nullptr);
|
||||
}
|
||||
|
||||
/* expect(str, res)
|
||||
*
|
||||
* Expect that 'str' starts at the character that was just read. If it does, advance
|
||||
* the input and return res. If not, flag an error.
|
||||
*/
|
||||
Json expect(const string &expected, Json res) {
|
||||
assert(i != 0);
|
||||
i--;
|
||||
if (str.compare(i, expected.length(), expected) == 0) {
|
||||
i += expected.length();
|
||||
return res;
|
||||
} else {
|
||||
return fail("parse error: expected " + expected + ", got " + str.substr(i, expected.length()));
|
||||
}
|
||||
}
|
||||
|
||||
/* parse_json()
|
||||
*
|
||||
* Parse a JSON object.
|
||||
*/
|
||||
Json parse_json(int depth) {
|
||||
if (depth > max_depth) {
|
||||
return fail("exceeded maximum nesting depth");
|
||||
}
|
||||
|
||||
char ch = get_next_token();
|
||||
if (failed)
|
||||
return Json();
|
||||
|
||||
if (ch == '-' || (ch >= '0' && ch <= '9')) {
|
||||
i--;
|
||||
return parse_number();
|
||||
}
|
||||
|
||||
if (ch == 't')
|
||||
return expect("true", true);
|
||||
|
||||
if (ch == 'f')
|
||||
return expect("false", false);
|
||||
|
||||
if (ch == 'n')
|
||||
return expect("null", Json());
|
||||
|
||||
if (ch == '"')
|
||||
return parse_string();
|
||||
|
||||
if (ch == '{') {
|
||||
map<string, Json> data;
|
||||
ch = get_next_token();
|
||||
if (ch == '}')
|
||||
return data;
|
||||
|
||||
while (1) {
|
||||
if (ch != '"')
|
||||
return fail("expected '\"' in object, got " + esc(ch));
|
||||
|
||||
string key = parse_string();
|
||||
if (failed)
|
||||
return Json();
|
||||
|
||||
ch = get_next_token();
|
||||
if (ch != ':')
|
||||
return fail("expected ':' in object, got " + esc(ch));
|
||||
|
||||
data[std::move(key)] = parse_json(depth + 1);
|
||||
if (failed)
|
||||
return Json();
|
||||
|
||||
ch = get_next_token();
|
||||
if (ch == '}')
|
||||
break;
|
||||
if (ch != ',')
|
||||
return fail("expected ',' in object, got " + esc(ch));
|
||||
|
||||
ch = get_next_token();
|
||||
}
|
||||
return data;
|
||||
}
|
||||
|
||||
if (ch == '[') {
|
||||
vector<Json> data;
|
||||
ch = get_next_token();
|
||||
if (ch == ']')
|
||||
return data;
|
||||
|
||||
while (1) {
|
||||
i--;
|
||||
data.push_back(parse_json(depth + 1));
|
||||
if (failed)
|
||||
return Json();
|
||||
|
||||
ch = get_next_token();
|
||||
if (ch == ']')
|
||||
break;
|
||||
if (ch != ',')
|
||||
return fail("expected ',' in list, got " + esc(ch));
|
||||
|
||||
ch = get_next_token();
|
||||
(void)ch;
|
||||
}
|
||||
return data;
|
||||
}
|
||||
|
||||
return fail("expected value, got " + esc(ch));
|
||||
}
|
||||
};
|
||||
}//namespace {
|
||||
|
||||
Json Json::parse(const string &in, string &err, JsonParse strategy) {
|
||||
JsonParser parser { in, 0, err, false, strategy };
|
||||
Json result = parser.parse_json(0);
|
||||
|
||||
// Check for any trailing garbage
|
||||
parser.consume_garbage();
|
||||
if (parser.failed)
|
||||
return Json();
|
||||
if (parser.i != in.size())
|
||||
return parser.fail("unexpected trailing " + esc(in[parser.i]));
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
// Documented in json11.hpp
|
||||
vector<Json> Json::parse_multi(const string &in,
|
||||
std::string::size_type &parser_stop_pos,
|
||||
string &err,
|
||||
JsonParse strategy) {
|
||||
JsonParser parser { in, 0, err, false, strategy };
|
||||
parser_stop_pos = 0;
|
||||
vector<Json> json_vec;
|
||||
while (parser.i != in.size() && !parser.failed) {
|
||||
json_vec.push_back(parser.parse_json(0));
|
||||
if (parser.failed)
|
||||
break;
|
||||
|
||||
// Check for another object
|
||||
parser.consume_garbage();
|
||||
if (parser.failed)
|
||||
break;
|
||||
parser_stop_pos = parser.i;
|
||||
}
|
||||
return json_vec;
|
||||
}
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * *
|
||||
* Shape-checking
|
||||
*/
|
||||
|
||||
bool Json::has_shape(const shape & types, string & err) const {
|
||||
if (!is_object()) {
|
||||
err = "expected JSON object, got " + dump();
|
||||
return false;
|
||||
}
|
||||
|
||||
for (auto & item : types) {
|
||||
if ((*this)[item.first].type() != item.second) {
|
||||
err = "bad type for " + item.first + " in " + dump();
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
} // namespace json11
|
||||
|
|
@ -0,0 +1,232 @@
|
|||
/* json11
|
||||
*
|
||||
* json11 is a tiny JSON library for C++11, providing JSON parsing and serialization.
|
||||
*
|
||||
* The core object provided by the library is json11::Json. A Json object represents any JSON
|
||||
* value: null, bool, number (int or double), string (std::string), array (std::vector), or
|
||||
* object (std::map).
|
||||
*
|
||||
* Json objects act like values: they can be assigned, copied, moved, compared for equality or
|
||||
* order, etc. There are also helper methods Json::dump, to serialize a Json to a string, and
|
||||
* Json::parse (static) to parse a std::string as a Json object.
|
||||
*
|
||||
* Internally, the various types of Json object are represented by the JsonValue class
|
||||
* hierarchy.
|
||||
*
|
||||
* A note on numbers - JSON specifies the syntax of number formatting but not its semantics,
|
||||
* so some JSON implementations distinguish between integers and floating-point numbers, while
|
||||
* some don't. In json11, we choose the latter. Because some JSON implementations (namely
|
||||
* Javascript itself) treat all numbers as the same type, distinguishing the two leads
|
||||
* to JSON that will be *silently* changed by a round-trip through those implementations.
|
||||
* Dangerous! To avoid that risk, json11 stores all numbers as double internally, but also
|
||||
* provides integer helpers.
|
||||
*
|
||||
* Fortunately, double-precision IEEE754 ('double') can precisely store any integer in the
|
||||
* range +/-2^53, which includes every 'int' on most systems. (Timestamps often use int64
|
||||
* or long long to avoid the Y2038K problem; a double storing microseconds since some epoch
|
||||
* will be exact for +/- 275 years.)
|
||||
*/
|
||||
|
||||
/* Copyright (c) 2013 Dropbox, Inc.
|
||||
*
|
||||
* 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 the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <string>
|
||||
#include <vector>
|
||||
#include <map>
|
||||
#include <memory>
|
||||
#include <initializer_list>
|
||||
|
||||
#ifdef _MSC_VER
|
||||
#if _MSC_VER <= 1800 // VS 2013
|
||||
#ifndef noexcept
|
||||
#define noexcept throw()
|
||||
#endif
|
||||
|
||||
#ifndef snprintf
|
||||
#define snprintf _snprintf_s
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
|
||||
namespace json11 {
|
||||
|
||||
enum JsonParse {
|
||||
STANDARD, COMMENTS
|
||||
};
|
||||
|
||||
class JsonValue;
|
||||
|
||||
class Json final {
|
||||
public:
|
||||
// Types
|
||||
enum Type {
|
||||
NUL, NUMBER, BOOL, STRING, ARRAY, OBJECT
|
||||
};
|
||||
|
||||
// Array and object typedefs
|
||||
typedef std::vector<Json> array;
|
||||
typedef std::map<std::string, Json> object;
|
||||
|
||||
// Constructors for the various types of JSON value.
|
||||
Json() noexcept; // NUL
|
||||
Json(std::nullptr_t) noexcept; // NUL
|
||||
Json(double value); // NUMBER
|
||||
Json(int value); // NUMBER
|
||||
Json(bool value); // BOOL
|
||||
Json(const std::string &value); // STRING
|
||||
Json(std::string &&value); // STRING
|
||||
Json(const char * value); // STRING
|
||||
Json(const array &values); // ARRAY
|
||||
Json(array &&values); // ARRAY
|
||||
Json(const object &values); // OBJECT
|
||||
Json(object &&values); // OBJECT
|
||||
|
||||
// Implicit constructor: anything with a to_json() function.
|
||||
template <class T, class = decltype(&T::to_json)>
|
||||
Json(const T & t) : Json(t.to_json()) {}
|
||||
|
||||
// Implicit constructor: map-like objects (std::map, std::unordered_map, etc)
|
||||
template <class M, typename std::enable_if<
|
||||
std::is_constructible<std::string, decltype(std::declval<M>().begin()->first)>::value
|
||||
&& std::is_constructible<Json, decltype(std::declval<M>().begin()->second)>::value,
|
||||
int>::type = 0>
|
||||
Json(const M & m) : Json(object(m.begin(), m.end())) {}
|
||||
|
||||
// Implicit constructor: vector-like objects (std::list, std::vector, std::set, etc)
|
||||
template <class V, typename std::enable_if<
|
||||
std::is_constructible<Json, decltype(*std::declval<V>().begin())>::value,
|
||||
int>::type = 0>
|
||||
Json(const V & v) : Json(array(v.begin(), v.end())) {}
|
||||
|
||||
// This prevents Json(some_pointer) from accidentally producing a bool. Use
|
||||
// Json(bool(some_pointer)) if that behavior is desired.
|
||||
Json(void *) = delete;
|
||||
|
||||
// Accessors
|
||||
Type type() const;
|
||||
|
||||
bool is_null() const { return type() == NUL; }
|
||||
bool is_number() const { return type() == NUMBER; }
|
||||
bool is_bool() const { return type() == BOOL; }
|
||||
bool is_string() const { return type() == STRING; }
|
||||
bool is_array() const { return type() == ARRAY; }
|
||||
bool is_object() const { return type() == OBJECT; }
|
||||
|
||||
// Return the enclosed value if this is a number, 0 otherwise. Note that json11 does not
|
||||
// distinguish between integer and non-integer numbers - number_value() and int_value()
|
||||
// can both be applied to a NUMBER-typed object.
|
||||
double number_value() const;
|
||||
int int_value() const;
|
||||
|
||||
// Return the enclosed value if this is a boolean, false otherwise.
|
||||
bool bool_value() const;
|
||||
// Return the enclosed string if this is a string, "" otherwise.
|
||||
const std::string &string_value() const;
|
||||
// Return the enclosed std::vector if this is an array, or an empty vector otherwise.
|
||||
const array &array_items() const;
|
||||
// Return the enclosed std::map if this is an object, or an empty map otherwise.
|
||||
const object &object_items() const;
|
||||
|
||||
// Return a reference to arr[i] if this is an array, Json() otherwise.
|
||||
const Json & operator[](size_t i) const;
|
||||
// Return a reference to obj[key] if this is an object, Json() otherwise.
|
||||
const Json & operator[](const std::string &key) const;
|
||||
|
||||
// Serialize.
|
||||
void dump(std::string &out) const;
|
||||
std::string dump() const {
|
||||
std::string out;
|
||||
dump(out);
|
||||
return out;
|
||||
}
|
||||
|
||||
// Parse. If parse fails, return Json() and assign an error message to err.
|
||||
static Json parse(const std::string & in,
|
||||
std::string & err,
|
||||
JsonParse strategy = JsonParse::STANDARD);
|
||||
static Json parse(const char * in,
|
||||
std::string & err,
|
||||
JsonParse strategy = JsonParse::STANDARD) {
|
||||
if (in) {
|
||||
return parse(std::string(in), err, strategy);
|
||||
} else {
|
||||
err = "null input";
|
||||
return nullptr;
|
||||
}
|
||||
}
|
||||
// Parse multiple objects, concatenated or separated by whitespace
|
||||
static std::vector<Json> parse_multi(
|
||||
const std::string & in,
|
||||
std::string::size_type & parser_stop_pos,
|
||||
std::string & err,
|
||||
JsonParse strategy = JsonParse::STANDARD);
|
||||
|
||||
static inline std::vector<Json> parse_multi(
|
||||
const std::string & in,
|
||||
std::string & err,
|
||||
JsonParse strategy = JsonParse::STANDARD) {
|
||||
std::string::size_type parser_stop_pos;
|
||||
return parse_multi(in, parser_stop_pos, err, strategy);
|
||||
}
|
||||
|
||||
bool operator== (const Json &rhs) const;
|
||||
bool operator< (const Json &rhs) const;
|
||||
bool operator!= (const Json &rhs) const { return !(*this == rhs); }
|
||||
bool operator<= (const Json &rhs) const { return !(rhs < *this); }
|
||||
bool operator> (const Json &rhs) const { return (rhs < *this); }
|
||||
bool operator>= (const Json &rhs) const { return !(*this < rhs); }
|
||||
|
||||
/* has_shape(types, err)
|
||||
*
|
||||
* Return true if this is a JSON object and, for each item in types, has a field of
|
||||
* the given type. If not, return false and set err to a descriptive message.
|
||||
*/
|
||||
typedef std::initializer_list<std::pair<std::string, Type>> shape;
|
||||
bool has_shape(const shape & types, std::string & err) const;
|
||||
|
||||
private:
|
||||
std::shared_ptr<JsonValue> m_ptr;
|
||||
};
|
||||
|
||||
// Internal class hierarchy - JsonValue objects are not exposed to users of this API.
|
||||
class JsonValue {
|
||||
protected:
|
||||
friend class Json;
|
||||
friend class JsonInt;
|
||||
friend class JsonDouble;
|
||||
virtual Json::Type type() const = 0;
|
||||
virtual bool equals(const JsonValue * other) const = 0;
|
||||
virtual bool less(const JsonValue * other) const = 0;
|
||||
virtual void dump(std::string &out) const = 0;
|
||||
virtual double number_value() const;
|
||||
virtual int int_value() const;
|
||||
virtual bool bool_value() const;
|
||||
virtual const std::string &string_value() const;
|
||||
virtual const Json::array &array_items() const;
|
||||
virtual const Json &operator[](size_t i) const;
|
||||
virtual const Json::object &object_items() const;
|
||||
virtual const Json &operator[](const std::string &key) const;
|
||||
virtual ~JsonValue() {}
|
||||
};
|
||||
|
||||
} // namespace json11
|
||||
Loading…
Reference in New Issue