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| #include "json.h"
|
| namespace ssjson {
|
| namespace _impl {
|
| typedef std::string Buffer;
|
| template <class Buf, class ...T>
| inline void DumpNumber(Buf &res, const char *fmt, T&&...val) {
| char buf[64] = {0};
| int n = snprintf(buf, sizeof(buf)-1, fmt, val...);
| res.append(buf, n);
| }
| inline void DumpFloat(Buffer &res, const long double fval) { DumpNumber(res, "%.*Lg", std::numeric_limits<long double>::digits10, fval); }
| inline void DumpInt(Buffer &res, const long long ival) { DumpNumber(res, "%lld", ival); }
| // inline void DumpFloat(Buffer &res, const double fval) { DumpNumber(res, "%.*g", std::numeric_limits<double>::digits10, fval); }
| // inline void DumpInt(Buffer &res, const long ival) { DumpNumber(res, "%ld", ival); }
|
| // assume utf8 string.
| void DumpString(Buffer &res, const std::string &s, const bool escape_unicode) {
| res += '\"';
|
| auto EscapeSpecialChar = [&](const int c) { // ( \b, \f, \t, \n, \r, \", \\, / ).
| const char esc_table[] = {
| 0 , 0, 0 , 0 , 0 , 0, 0, 0 , 'b', 't',
| 'n', 0, 'f','r', 0 , 0, 0, 0 , 0 , 0 ,
| 0 , 0, 0 , 0 , 0 , 0, 0, 0 , 0 , 0 ,
| 0 , 0, 0 , 0 ,'\"', 0, 0, 0 , 0 , 0 ,
| 0 , 0, 0 , 0 , 0 , 0, 0, '/', 0 , 0 ,
| 0 , 0, 0 , 0 , 0 , 0, 0, 0 , 0 , 0 ,
| 0 , 0, 0 , 0 , 0 , 0, 0, 0 , 0 , 0 ,
| 0 , 0, 0 , 0 , 0 , 0, 0, 0 , 0 , 0 ,
| 0 , 0, 0 , 0 , 0 , 0, 0, 0 , 0 , 0 ,
| 0 , 0,'\\', };
| res += '\\';
| res += esc_table[c];
| };
| auto AddUnicode = [&](unsigned u) {
| auto HexChar = [](unsigned char uc) { return "0123456789abcdef"[uc & 0xF]; };
| char buf[6] = { '\\', 'u', HexChar(u>>12), HexChar(u>>8), HexChar(u>>4), HexChar(u) };
| res.append(buf, buf+6);
| };
| auto IsControl = [](const unsigned char c) { return c < 0x20 || c == 0x7F; };
|
| if (escape_unicode) {
| for (unsigned i = 0; i < s.size(); ++i) {
| switch(s[i]) {
| case '\b': case '\f': case '\t': case '\n': case '\r':
| case '\"': case '\\': case '/' :
| EscapeSpecialChar(s[i]);
| break;
| default :
| {
| const unsigned char &uc = (unsigned char &)s[i];
| const unsigned char *sz = &uc;
| if (IsControl(uc)) { // control characters
| AddUnicode(uc);
| } else if (uc < 0x80) {
| res += s[i];
| } else if (uc < 0xE0) { // 2 bytes
| AddUnicode(((sz[0]&0x1F)<<6) | (sz[1] & 0x3F));
| i += 1;
| } else if (uc < 0xF0) { // 3 bytes
| AddUnicode(((sz[0]&0x0F)<<12) | ((sz[1]&0x3F)<<6) | (sz[2] & 0x3F));
| i += 2;
| } else {
| res += s[i]; // exceed 0xFFFF.
| }
| } break;
| }
| }
| } else {
| for (unsigned i = 0; i < s.size(); ++i) {
| switch(s[i]) {
| case '\b': case '\f': case '\t': case '\n': case '\r':
| case '\"': case '\\': case '/' :
| EscapeSpecialChar(s[i]);
| break;
| default :
| if (IsControl(s[i])) { // control characters
| AddUnicode(s[i]);
| } else {
| res += s[i];
| }
| break;
| }
| }
| }
| res += '\"';
| };
|
| void Dump(const JValue &jv, Buffer &res, JValue::DumpOptions &opt, const bool pretty)
| {
| auto NewLine = [&]() {
| res += '\n';
| res.append(opt.indent_level_ * opt.indent_step_, ' ');
| };
|
| switch (jv.type()) {
| case JValue::jv_object:
| {
| res += '{';
| auto &obj = jv.object();
| if (!obj.empty()) {
| if (pretty) {
| opt.indent_level_++;
| for (auto &&kv : obj) {
| NewLine();
| DumpString(res, kv.first, opt.escape_unicode_);
| res.append(": ", 2);
| Dump(kv.second, res, opt, pretty);
| res += ',';
| }
| res.pop_back(); // remove last ',';
| opt.indent_level_--;
| NewLine();
| } else {
| for (auto &&kv : obj) {
| DumpString(res, kv.first, opt.escape_unicode_);
| res += ':';
| Dump(kv.second, res, opt, pretty);
| res += ',';
| }
| res.pop_back(); // remove last ',';
| }
| }
| res += '}';
| } break;
| case JValue::jv_array:
| {
| res += '[';
| auto &arr = jv.array();
| if (!arr.empty()) {
| if (pretty) {
| opt.indent_level_++;
| for (auto &&v : arr) {
| NewLine();
| Dump(v, res, opt, pretty);
| res += ',';
| }
| res.pop_back(); // remove last ',';
| opt.indent_level_--;
| NewLine();
| } else {
| for (auto &&v : arr) {
| Dump(v, res, opt, pretty);
| res += ',';
| }
| res.pop_back(); // remove last ',';
| }
| }
| res += ']';
| } break;
| case JValue::jv_float:
| {
| auto idx = res.size();
| DumpFloat(res, jv.get_value<JValue::float_type>());
| while (idx < res.size() && res[idx] != '.') {
| ++idx;
| }
| if (idx == res.size()) {
| res.append(".0", 2);
| }
| } break;
| case JValue::jv_null: res.append("null", 4); break;
| case JValue::jv_int: DumpInt(res, jv.get_value<JValue::int_type>()); break;
| case JValue::jv_bool:
| if (jv.get_value<bool>()) {
| res.append("true", 4);
| } else {
| res.append("false", 5);
| }
| break;
| case JValue::jv_string: DumpString(res, jv.get_value<std::string>(), opt.escape_unicode_); break;
| default: std::invalid_argument("invalid json type:" + std::to_string(jv.type())); break;
| }
| }
|
| auto HexCharVal = [](const unsigned char c) {
| static const unsigned char hex_char_table[] = {
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 10, 11, 12, 13, 14, 15, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 10, 11, 12, 13, 14, 15, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
| };
| return hex_char_table[c];
| };
| } // namespace _impl
|
| int JValue::parse(const char *begin, const char *end)
| {
| using namespace _impl;
| const char *p = begin;
|
| auto Error = [&](const std::string &msg = "invalid value at"){ throw std::invalid_argument(msg + " : "+ std::string(p, std::min(int(end-p), 30))); };
| auto IsSpace = [](const char c) {
| return c == ' ' || c == '\t' || c == '\r' || c == '\n';
| };
| auto IgnoreSpaces = [&]() { while (p != end && IsSpace(*p)) { ++p; } };
| auto Peek = [&]() { IgnoreSpaces(); if (p == end) { Error("input ends unexpectedly!"); } return *p; };
| auto Expect = [&](const char c) { if (Peek() != c) { Error(std::string("parse error, expecting ") + c); } };
|
| auto parse_string = [&]() {
| std::string res;
| auto to_utf8 = [&]() {
| auto Hex4 = [](const char *sz) {
| auto FromHex = [](const unsigned char c)->unsigned char {
| const unsigned char v = HexCharVal(c);
| if (v == 0xFF) {
| throw std::invalid_argument(std::string("invalid unicode input ") + char(c));
| }
| return v;
| };
| return (FromHex(sz[0]) << 12) | (FromHex(sz[1]) << 8) | (FromHex(sz[2]) << 4) | (FromHex(sz[3]));
| };
| const unsigned int u = Hex4(p+2);
| p += 4;
| if (u < 0x80) {
| res += char(u);
| } else if (u < 0x800) {
| res += char((u >> 6) | 0xC0);
| res += char((u & 0x3F) | 0x80);
| } else if (u < 0x10000) {
| res += char((u >> 12) | 0xE0);
| res += char(((u >> 6)& 0x3F) | 0x80);
| res += char((u & 0x3F) | 0x80);
| } else if (u < 0x110000) {
| res += char((u >> 18) | 0xF0);
| res += char(((u >> 12)& 0x3F) | 0x80);
| res += char(((u >> 6)& 0x3F) | 0x80);
| res += char((u & 0x3F) | 0x80);
| } else {
| Error("invalid unicode codepoint");
| }
| };
| auto ParseEscapedChar = [&](const int c) {
| const char unesc_table[] = {
| 0 , '\b', 0 , 0 , 0 , '\f', 0 ,
| 0 , 0 , 0 , 0 , 0 , 0 , '\n',
| 0 , 0 , 0 , '\r', 0 , '\t', };
| res += unesc_table[c-'a'];
| };
| unsigned left = 0;
| auto AddLeft = [&] { if (left != 0) { res.append(p-left, left); left = 0; } };
| while (++p != end) {
| switch(*p) {
| case '\"':
| AddLeft();
| ++p;
| return res;
| case '\\':
| AddLeft();
| if (p+1 != end) {
| switch (p[1]) {
| case 'b' : case 'f' : case 'n' : case 'r' : case 't' : ParseEscapedChar(p[1]); break;
| case 'u' : to_utf8(); break;
| case '\"': case '\\': case '/' : ++left; break;
| default: left += 2; break;
| }
| ++p; // parsed 2 char.
| } // else, next round will fail.
| break;
| // and escaped char should not appear.
| case '\t': case '\n': case '\r': case '\b': case '\f': //case '/' :
| AddLeft();
| Error("invalid string content") ;
| break;
| default: ++left; break;
| }
| }
| Error("string ends unexpectedly!");
| return res;
| };
|
| auto parse_object = [&]() {
| assert(*p == '{');
| ++p;
| if (Peek() == '}') {
| ++p;
| return object_type();
| }
| object_type obj;
| while (true) {
| Expect('\"');
| std::string key(parse_string());
|
| Expect(':');
| ++p;
|
| JValue v;
| p += v.parse(p, end);
| obj.emplace(std::move(key), std::move(v));
|
| switch (Peek()) {
| case ',': ++p; break;
| case '}': ++p; return obj;
| default: Error("parse object error");
| }
| }
| };
| auto parse_array = [&]() {
| assert(*p == '[');
| ++p;
| if (Peek() == ']') {
| ++p;
| return array_type();
| }
| array_type arr;
| while (true) {
| JValue v;
| p += v.parse(p, end);
| arr.emplace_back(std::move(v));
|
| switch (Peek()) {
| case ',': ++p; break;
| case ']': ++p; return arr;
| default: Error("parse array error");
| }
| }
| };
|
| auto ExpectText = [&](const char *sz, const size_t len) {
| if(memcmp(p+1, sz+1, len-1) == 0) {
| p += len;
| } else {
| Error("parse literal error, expecting '" + std::string(sz, len) + "', read " + std::string(p, len).c_str());
| }
| };
|
| switch (Peek()) {
| case '{': *this = parse_object(); break;
| case '[': *this = parse_array(); break;
| case '\"': *this = parse_string(); break;
| case 't': ExpectText("true", 4); *this = true; break;
| case 'f': ExpectText("false", 5); *this = false; break;
| case 'n': ExpectText("null", 4); *this = nullptr; break;
| case '0': case '1': case '2': case '3': case '4':
| case '5': case '6': case '7': case '8': case '9': case '-':
| {
| auto IsNumber = [](const char c) { return '0' <= c && c <= '9'; };
| auto sep = p+1;
| while (sep != end && IsNumber(*sep)) { ++sep; }
| char *parse_end = (char*)p;
| switch (*sep) {
| case '.' : case 'e' : case 'E': *this = strtold((char*)p, &parse_end); break;
| default: *this = strtoll((char*)p, &parse_end, 10); break;
| }
| p = parse_end;
| } break;
| default : Error(); break;
| }
| return p - begin;
| }
|
| std::string JValue::dump(const DumpOptions &opt_in) const {
| using namespace _impl;
| Buffer res;
| DumpOptions opt(opt_in);
| if(opt.indent_step_ > 0) {
| res.append(opt.indent_level_ * opt.indent_step_, ' ');
| }
| Dump(*this, res, opt, opt.indent_step_ > 0);
| return res;
| }
| } // jsonpp
|
|
