mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-13 02:53:38 +00:00
840 lines
19 KiB
C++
840 lines
19 KiB
C++
#include <string>
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#include <string.h>
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#include <Poco/UTF8Encoding.h>
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#include <Poco/NumberParser.h>
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#include <common/JSON.h>
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#include <common/find_symbols.h>
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#include <common/preciseExp10.h>
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#include <iostream>
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#define JSON_MAX_DEPTH 100
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POCO_IMPLEMENT_EXCEPTION(JSONException, Poco::Exception, "JSONException")
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/// Прочитать беззнаковое целое в простом формате из не-0-terminated строки.
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static UInt64 readUIntText(const char * buf, const char * end)
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{
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UInt64 x = 0;
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if (buf == end)
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throw JSONException("JSON: cannot parse unsigned integer: unexpected end of data.");
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while (buf != end)
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{
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switch (*buf)
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{
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case '+':
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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x *= 10;
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x += *buf - '0';
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break;
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default:
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return x;
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}
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++buf;
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}
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return x;
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}
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/// Прочитать знаковое целое в простом формате из не-0-terminated строки.
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static Int64 readIntText(const char * buf, const char * end)
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{
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bool negative = false;
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UInt64 x = 0;
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if (buf == end)
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throw JSONException("JSON: cannot parse signed integer: unexpected end of data.");
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bool run = true;
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while (buf != end && run)
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{
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switch (*buf)
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{
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case '+':
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break;
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case '-':
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negative = true;
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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x *= 10;
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x += *buf - '0';
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break;
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default:
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run = false;
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break;
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}
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++buf;
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}
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return negative ? -x : x;
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}
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/// Прочитать число с плавающей запятой в простом формате, с грубым округлением, из не-0-terminated строки.
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static double readFloatText(const char * buf, const char * end)
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{
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bool negative = false;
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double x = 0;
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bool after_point = false;
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double power_of_ten = 1;
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if (buf == end)
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throw JSONException("JSON: cannot parse floating point number: unexpected end of data.");
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bool run = true;
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while (buf != end && run)
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{
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switch (*buf)
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{
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case '+':
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break;
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case '-':
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negative = true;
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break;
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case '.':
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after_point = true;
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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if (after_point)
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{
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power_of_ten /= 10;
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x += (*buf - '0') * power_of_ten;
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}
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else
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{
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x *= 10;
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x += *buf - '0';
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}
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break;
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case 'e':
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case 'E':
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{
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++buf;
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Int32 exponent = readIntText(buf, end);
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x *= preciseExp10(exponent);
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run = false;
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break;
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}
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default:
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run = false;
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break;
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}
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++buf;
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}
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if (negative)
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x = -x;
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return x;
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}
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void JSON::checkInit() const
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{
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if (!(ptr_begin < ptr_end))
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throw JSONException("JSON: begin >= end.");
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if (level > JSON_MAX_DEPTH)
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throw JSONException("JSON: too deep.");
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}
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JSON::ElementType JSON::getType() const
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{
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switch (*ptr_begin)
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{
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case '{':
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return TYPE_OBJECT;
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case '[':
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return TYPE_ARRAY;
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case 't':
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case 'f':
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return TYPE_BOOL;
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case 'n':
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return TYPE_NULL;
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case '-':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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return TYPE_NUMBER;
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case '"':
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{
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/// Проверим - это просто строка или name-value pair
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Pos after_string = skipString();
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if (after_string < ptr_end && *after_string == ':')
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return TYPE_NAME_VALUE_PAIR;
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else
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return TYPE_STRING;
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}
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default:
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throw JSONException(std::string("JSON: unexpected char ") + *ptr_begin + ", expected one of '{[tfn-0123456789\"'");
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}
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}
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void JSON::checkPos(Pos pos) const
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{
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if (pos >= ptr_end || ptr_begin == nullptr)
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throw JSONException("JSON: unexpected end of data.");
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}
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JSON::Pos JSON::skipString() const
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{
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//std::cerr << "skipString()\t" << data() << std::endl;
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Pos pos = ptr_begin;
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checkPos(pos);
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if (*pos != '"')
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throw JSONException(std::string("JSON: expected \", got ") + *pos);
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++pos;
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/// fast path: находим следующую двойную кавычку. Если перед ней нет бэкслеша - значит это конец строки (при допущении корректности JSON).
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Pos closing_quote = reinterpret_cast<const char *>(memchr(reinterpret_cast<const void *>(pos), '\"', ptr_end - pos));
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if (nullptr != closing_quote && closing_quote[-1] != '\\')
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return closing_quote + 1;
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/// slow path
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while (pos < ptr_end && *pos != '"')
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{
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if (*pos == '\\')
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{
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++pos;
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checkPos(pos);
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if (*pos == 'u')
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{
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pos += 4;
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checkPos(pos);
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}
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}
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++pos;
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}
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checkPos(pos);
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if (*pos != '"')
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throw JSONException(std::string("JSON: expected \", got ") + *pos);
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++pos;
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return pos;
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}
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JSON::Pos JSON::skipNumber() const
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{
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//std::cerr << "skipNumber()\t" << data() << std::endl;
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Pos pos = ptr_begin;
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checkPos(pos);
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if (*pos == '-')
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++pos;
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while (pos < ptr_end && *pos >= '0' && *pos <= '9')
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++pos;
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if (pos < ptr_end && *pos == '.')
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++pos;
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while (pos < ptr_end && *pos >= '0' && *pos <= '9')
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++pos;
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if (pos < ptr_end && (*pos == 'e' || *pos == 'E'))
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++pos;
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if (pos < ptr_end && *pos == '-')
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++pos;
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while (pos < ptr_end && *pos >= '0' && *pos <= '9')
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++pos;
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return pos;
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}
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JSON::Pos JSON::skipBool() const
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{
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//std::cerr << "skipBool()\t" << data() << std::endl;
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Pos pos = ptr_begin;
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checkPos(pos);
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if (*ptr_begin == 't')
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pos += 4;
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else if (*ptr_begin == 'f')
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pos += 5;
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else
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throw JSONException("JSON: expected true or false.");
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return pos;
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}
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JSON::Pos JSON::skipNull() const
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{
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//std::cerr << "skipNull()\t" << data() << std::endl;
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return ptr_begin + 4;
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}
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JSON::Pos JSON::skipNameValuePair() const
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{
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//std::cerr << "skipNameValuePair()\t" << data() << std::endl;
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Pos pos = skipString();
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checkPos(pos);
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if (*pos != ':')
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throw JSONException("JSON: expected :.");
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++pos;
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return JSON(pos, ptr_end, level + 1).skipElement();
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}
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JSON::Pos JSON::skipArray() const
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{
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//std::cerr << "skipArray()\t" << data() << std::endl;
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if (!isArray())
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throw JSONException("JSON: expected [");
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Pos pos = ptr_begin;
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++pos;
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checkPos(pos);
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if (*pos == ']')
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return ++pos;
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while (true)
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{
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pos = JSON(pos, ptr_end, level + 1).skipElement();
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checkPos(pos);
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switch (*pos)
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{
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case ',':
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++pos;
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break;
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case ']':
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return ++pos;
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default:
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throw JSONException(std::string("JSON: expected one of ',]', got ") + *pos);
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}
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}
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}
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JSON::Pos JSON::skipObject() const
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{
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//std::cerr << "skipObject()\t" << data() << std::endl;
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if (!isObject())
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throw JSONException("JSON: expected {");
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Pos pos = ptr_begin;
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++pos;
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checkPos(pos);
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if (*pos == '}')
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return ++pos;
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while (true)
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{
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pos = JSON(pos, ptr_end, level + 1).skipNameValuePair();
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checkPos(pos);
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switch (*pos)
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{
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case ',':
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++pos;
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break;
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case '}':
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return ++pos;
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default:
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throw JSONException(std::string("JSON: expected one of ',}', got ") + *pos);
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}
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}
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}
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JSON::Pos JSON::skipElement() const
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{
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//std::cerr << "skipElement()\t" << data() << std::endl;
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ElementType type = getType();
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switch (type)
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{
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case TYPE_NULL:
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return skipNull();
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case TYPE_BOOL:
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return skipBool();
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case TYPE_NUMBER:
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return skipNumber();
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case TYPE_STRING:
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return skipString();
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case TYPE_NAME_VALUE_PAIR:
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return skipNameValuePair();
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case TYPE_ARRAY:
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return skipArray();
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case TYPE_OBJECT:
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return skipObject();
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default:
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throw JSONException("Logical error in JSON: unknown element type: " + std::to_string(type));
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}
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}
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size_t JSON::size() const
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{
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size_t i = 0;
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for (const_iterator it = begin(); it != end(); ++it)
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++i;
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return i;
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}
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bool JSON::empty() const
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{
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return size() == 0;
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}
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JSON JSON::operator[] (size_t n) const
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{
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ElementType type = getType();
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if (type != TYPE_ARRAY)
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throw JSONException("JSON: not array when calling operator[](size_t) method.");
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Pos pos = ptr_begin;
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++pos;
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checkPos(pos);
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size_t i = 0;
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const_iterator it = begin();
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while (i < n && it != end())
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++it, ++i;
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if (i != n)
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throw JSONException("JSON: array index " + std::to_string(n) + " out of bounds.");
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return *it;
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}
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JSON::Pos JSON::searchField(const char * data, size_t size) const
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{
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ElementType type = getType();
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if (type != TYPE_OBJECT)
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throw JSONException("JSON: not object when calling operator[](const char *) or has(const char *) method.");
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const_iterator it = begin();
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for (; it != end(); ++it)
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{
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if (!it->hasEscapes())
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{
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if (static_cast<int>(size) + 2 > it->dataEnd() - it->data())
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continue;
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if (!strncmp(data, it->data() + 1, size))
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break;
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}
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else
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{
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std::string current_name = it->getName();
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if (current_name.size() == size && 0 == memcmp(current_name.data(), data, size))
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break;
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}
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}
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if (it == end())
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return nullptr;
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else
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return it->data();
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}
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bool JSON::hasEscapes() const
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{
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Pos pos = ptr_begin + 1;
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while (pos < ptr_end && *pos != '"' && *pos != '\\')
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++pos;
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if (*pos == '"')
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return false;
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else if (*pos == '\\')
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return true;
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throw JSONException("JSON: unexpected end of data.");
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}
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bool JSON::hasSpecialChars() const
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{
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Pos pos = ptr_begin + 1;
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while (pos < ptr_end && *pos != '"'
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&& *pos != '\\' && *pos != '\r' && *pos != '\n' && *pos != '\t'
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&& *pos != '\f' && *pos != '\b' && *pos != '\0' && *pos != '\'')
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++pos;
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if (*pos == '"')
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return false;
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else if (pos < ptr_end)
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return true;
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throw JSONException("JSON: unexpected end of data.");
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}
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JSON JSON::operator[] (const std::string & name) const
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{
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Pos pos = searchField(name);
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if (!pos)
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throw JSONException("JSON: there is no element '" + std::string(name) + "' in object.");
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return JSON(pos, ptr_end, level + 1).getValue();
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}
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bool JSON::has(const char * data, size_t size) const
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{
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return nullptr != searchField(data, size);
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}
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double JSON::getDouble() const
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{
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return readFloatText(ptr_begin, ptr_end);
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}
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Int64 JSON::getInt() const
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{
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return readIntText(ptr_begin, ptr_end);
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}
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UInt64 JSON::getUInt() const
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{
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return readUIntText(ptr_begin, ptr_end);
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}
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bool JSON::getBool() const
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{
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if (*ptr_begin == 't')
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return true;
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if (*ptr_begin == 'f')
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return false;
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throw JSONException("JSON: cannot parse boolean.");
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}
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std::string JSON::getString() const
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{
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Pos s = ptr_begin;
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if (*s != '"')
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throw JSONException(std::string("JSON: expected \", got ") + *s);
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++s;
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checkPos(s);
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std::string buf;
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do
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{
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Pos p = find_first_symbols<'\\','"'>(s, ptr_end);
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if (p >= ptr_end)
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{
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break;
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}
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buf.append(s, p);
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s = p;
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switch (*s)
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{
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case '\\':
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++s;
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checkPos(s);
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switch (*s)
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{
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case '"':
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buf += '"';
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break;
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case '\\':
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buf += '\\';
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break;
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case '/':
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buf += '/';
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break;
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case 'b':
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buf += '\b';
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break;
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case 'f':
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buf += '\f';
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break;
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case 'n':
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buf += '\n';
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break;
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case 'r':
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buf += '\r';
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break;
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case 't':
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buf += '\t';
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break;
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case 'u':
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{
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Poco::UTF8Encoding utf8;
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++s;
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checkPos(s + 4);
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std::string hex(s, 4);
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s += 3;
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int unicode;
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try
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{
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unicode = Poco::NumberParser::parseHex(hex);
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}
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catch (const Poco::SyntaxException & e)
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{
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throw JSONException("JSON: incorrect syntax: incorrect HEX code.");
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}
|
||
buf.resize(buf.size() + 6); /// максимальный размер UTF8 многобайтовой последовательности
|
||
int res = utf8.convert(unicode,
|
||
reinterpret_cast<unsigned char *>(const_cast<char*>(buf.data())) + buf.size() - 6, 6);
|
||
if (!res)
|
||
throw JSONException("JSON: cannot convert unicode " + std::to_string(unicode)
|
||
+ " to UTF8.");
|
||
buf.resize(buf.size() - 6 + res);
|
||
break;
|
||
}
|
||
default:
|
||
buf += *s;
|
||
break;
|
||
}
|
||
++s;
|
||
break;
|
||
case '"':
|
||
return buf;
|
||
default:
|
||
throw JSONException("find_first_symbols<...>() failed in unexpected way");
|
||
}
|
||
} while (s < ptr_end);
|
||
throw JSONException("JSON: incorrect syntax (expected end of string, found end of JSON).");
|
||
}
|
||
|
||
std::string JSON::getName() const
|
||
{
|
||
return getString();
|
||
}
|
||
|
||
StringRef JSON::getRawString() const
|
||
{
|
||
Pos s = ptr_begin;
|
||
if (*s != '"')
|
||
throw JSONException(std::string("JSON: expected \", got ") + *s);
|
||
while (++s != ptr_end && *s != '"');
|
||
if (s != ptr_end)
|
||
return StringRef(ptr_begin + 1, s - ptr_begin - 1);
|
||
throw JSONException("JSON: incorrect syntax (expected end of string, found end of JSON).");
|
||
}
|
||
|
||
StringRef JSON::getRawName() const
|
||
{
|
||
return getRawString();
|
||
}
|
||
|
||
JSON JSON::getValue() const
|
||
{
|
||
Pos pos = skipString();
|
||
checkPos(pos);
|
||
if (*pos != ':')
|
||
throw JSONException("JSON: expected :.");
|
||
++pos;
|
||
checkPos(pos);
|
||
return JSON(pos, ptr_end, level + 1);
|
||
}
|
||
|
||
|
||
double JSON::toDouble() const
|
||
{
|
||
ElementType type = getType();
|
||
|
||
if (type == TYPE_NUMBER)
|
||
return getDouble();
|
||
else if (type == TYPE_STRING)
|
||
return JSON(ptr_begin + 1, ptr_end, level + 1).getDouble();
|
||
else
|
||
throw JSONException("JSON: cannot convert value to double.");
|
||
}
|
||
|
||
Int64 JSON::toInt() const
|
||
{
|
||
ElementType type = getType();
|
||
|
||
if (type == TYPE_NUMBER)
|
||
return getInt();
|
||
else if (type == TYPE_STRING)
|
||
return JSON(ptr_begin + 1, ptr_end, level + 1).getInt();
|
||
else
|
||
throw JSONException("JSON: cannot convert value to signed integer.");
|
||
}
|
||
|
||
UInt64 JSON::toUInt() const
|
||
{
|
||
ElementType type = getType();
|
||
|
||
if (type == TYPE_NUMBER)
|
||
return getUInt();
|
||
else if (type == TYPE_STRING)
|
||
return JSON(ptr_begin + 1, ptr_end, level + 1).getUInt();
|
||
else
|
||
throw JSONException("JSON: cannot convert value to unsigned integer.");
|
||
}
|
||
|
||
std::string JSON::toString() const
|
||
{
|
||
ElementType type = getType();
|
||
|
||
if (type == TYPE_STRING)
|
||
return getString();
|
||
else
|
||
{
|
||
Pos pos = skipElement();
|
||
return std::string(ptr_begin, pos - ptr_begin);
|
||
}
|
||
}
|
||
|
||
|
||
JSON::iterator JSON::iterator::begin() const
|
||
{
|
||
ElementType type = getType();
|
||
|
||
if (type != TYPE_ARRAY && type != TYPE_OBJECT)
|
||
throw JSONException("JSON: not array or object when calling begin() method.");
|
||
|
||
//std::cerr << "begin()\t" << data() << std::endl;
|
||
|
||
Pos pos = ptr_begin + 1;
|
||
checkPos(pos);
|
||
if (*pos == '}' || *pos == ']')
|
||
return end();
|
||
|
||
return JSON(pos, ptr_end, level + 1);
|
||
}
|
||
|
||
JSON::iterator JSON::iterator::end() const
|
||
{
|
||
return JSON(nullptr, ptr_end, level + 1);
|
||
}
|
||
|
||
JSON::iterator & JSON::iterator::operator++()
|
||
{
|
||
Pos pos = skipElement();
|
||
checkPos(pos);
|
||
|
||
if (*pos != ',')
|
||
ptr_begin = nullptr;
|
||
else
|
||
{
|
||
++pos;
|
||
checkPos(pos);
|
||
ptr_begin = pos;
|
||
}
|
||
|
||
return *this;
|
||
}
|
||
|
||
JSON::iterator JSON::iterator::operator++(int) // NOLINT
|
||
{
|
||
iterator copy(*this);
|
||
++*this;
|
||
return copy;
|
||
}
|
||
|
||
template <>
|
||
double JSON::get<double>() const
|
||
{
|
||
return getDouble();
|
||
}
|
||
|
||
template <>
|
||
std::string JSON::get<std::string>() const
|
||
{
|
||
return getString();
|
||
}
|
||
|
||
template <>
|
||
Int64 JSON::get<Int64>() const
|
||
{
|
||
return getInt();
|
||
}
|
||
|
||
template <>
|
||
UInt64 JSON::get<UInt64>() const
|
||
{
|
||
return getUInt();
|
||
}
|
||
|
||
template <>
|
||
bool JSON::get<bool>() const
|
||
{
|
||
return getBool();
|
||
}
|
||
|
||
template <>
|
||
bool JSON::isType<std::string>() const
|
||
{
|
||
return isString();
|
||
}
|
||
|
||
template <>
|
||
bool JSON::isType<UInt64>() const
|
||
{
|
||
return isNumber();
|
||
}
|
||
|
||
template <>
|
||
bool JSON::isType<Int64>() const
|
||
{
|
||
return isNumber();
|
||
}
|
||
|
||
template <>
|
||
bool JSON::isType<bool>() const
|
||
{
|
||
return isBool();
|
||
}
|
||
|