mirror of
https://github.com/moparisthebest/mailiverse
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534 lines
16 KiB
C++
Executable File
534 lines
16 KiB
C++
Executable File
/******************************************************************************
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Copyright (c) 2009-2010, Terry Caton
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the projecct nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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******************************************************************************/
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#include <cassert>
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#include <set>
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#include <sstream>
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/*
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TODO:
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* better documentation
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* unicode character decoding
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*/
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namespace json
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{
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template<typename istream>
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inline istream& operator >> (istream& istr, UnknownElement& elementRoot) {
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Reader<istream>::Read(elementRoot, istr);
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return istr;
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}
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//////////////////////
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// Reader::InputStream
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///////////////////
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// Reader (finally)
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template <typename istream>
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template <typename ElementTypeT>
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void Reader<istream>::Read_i(ElementTypeT& element, istream& istr)
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{
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Reader reader;
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Tokens tokens;
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InputStream inputStream(istr);
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reader.Scan(tokens, inputStream);
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TokenStream tokenStream(tokens);
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reader.Parse(element, tokenStream);
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if (tokenStream.EOS() == false)
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{
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const Token& token = tokenStream.Peek();
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std::string sMessage = std::string("Expected End of token stream; found ") + token.sValue;
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throw ParseException(sMessage, token.locBegin, token.locEnd);
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}
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}
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template <typename istream>
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inline void Reader<istream>::Scan(Tokens& tokens, InputStream& inputStream)
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{
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while (EatWhiteSpace(inputStream), // ignore any leading white space...
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inputStream.EOS() == false) // ...before checking for EOS
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{
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// if all goes well, we'll create a token each pass
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Token token;
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token.locBegin = inputStream.GetLocation();
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// gives us null-terminated string
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char sChar = inputStream.Peek();
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switch (sChar)
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{
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case '{':
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token.sValue = MatchExpectedString(inputStream, "{");
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token.nType = Token::TOKEN_OBJECT_BEGIN;
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break;
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case '}':
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token.sValue = MatchExpectedString(inputStream, "}");
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token.nType = Token::TOKEN_OBJECT_END;
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break;
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case '[':
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token.sValue = MatchExpectedString(inputStream, "[");
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token.nType = Token::TOKEN_ARRAY_BEGIN;
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break;
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case ']':
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token.sValue = MatchExpectedString(inputStream, "]");
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token.nType = Token::TOKEN_ARRAY_END;
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break;
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case ',':
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token.sValue = MatchExpectedString(inputStream, ",");
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token.nType = Token::TOKEN_NEXT_ELEMENT;
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break;
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case ':':
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token.sValue = MatchExpectedString(inputStream, ":");
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token.nType = Token::TOKEN_MEMBER_ASSIGN;
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break;
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case '"':
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token.sValue = MatchString(inputStream);
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token.nType = Token::TOKEN_STRING;
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break;
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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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token.nValue = MatchNumber(inputStream);
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token.nType = Token::TOKEN_NUMBER;
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break;
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case 't':
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token.sValue = MatchExpectedString(inputStream, "true");
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token.nType = Token::TOKEN_BOOLEAN;
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break;
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case 'f':
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token.sValue = MatchExpectedString(inputStream, "false");
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token.nType = Token::TOKEN_BOOLEAN;
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break;
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case 'n':
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token.sValue = MatchExpectedString(inputStream, "null");
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token.nType = Token::TOKEN_NULL;
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break;
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default:
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{
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std::string sErrorMessage = std::string("Unexpected character in stream: ") + sChar;
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throw ScanException(sErrorMessage, inputStream.GetLocation());
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}
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}
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token.locEnd = inputStream.GetLocation();
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tokens.push_back(token);
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}
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}
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template <typename istream>
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inline void Reader<istream>::EatWhiteSpace(InputStream& inputStream)
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{
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while (inputStream.EOS() == false &&
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::isspace(inputStream.Peek()))
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inputStream.Get();
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}
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template <typename istream>
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inline const std::string &Reader<istream>::MatchExpectedString(InputStream& inputStream, const std::string& sExpected)
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{
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std::string::const_iterator it(sExpected.begin()),
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itEnd(sExpected.end());
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for ( ; it != itEnd; ++it) {
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if (inputStream.EOS() || // did we reach the end before finding what we're looking for...
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inputStream.Get() != *it) // ...or did we find something different?
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{
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std::string sMessage = std::string("Expected string: ") + sExpected;
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throw ScanException(sMessage, inputStream.GetLocation());
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}
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}
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// all's well if we made it here
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return sExpected;
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}
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inline unsigned int decodeUnicodeCodePoint (InputStream& inputStream)
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{
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unsigned int v_[2];
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unsigned int &unicode = v_[0];
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unsigned int &surrogate = v_[1];
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for (int n=0; n<2; n++)
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{
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unsigned int &v = v_[x];
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v = 0;
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for (int i=3; i>=0 && !inputStream.EOS(); --i)
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{
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char c = inputStream.Get();
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unsigned int ord = 0;
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if ('0' <= c && c <= '9')
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ord = c - '0';
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else
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if ('A' <= c && c <= 'F')
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ord = 10 + (c - 'A');
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else
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if ('a' <= c && c <= 'f')
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ord = 10 + (c - 'a');
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v |= ord << (4 * i);
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}
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bool hasSurrogate = false;
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if (v >= 0xD800 && v <= 0xDBFF)
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{
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int pos = inputStream.TellG();
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if (!inputStream.Get() != '\\' || !inputStream.Get() != 'u')
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inputStream.SetG(pos);
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else
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hasSurrogate = true;
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}
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if (!hasSurrogate)
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break;
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}
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if (n == 2)
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unicode = 0x10000 + ((unicode & 0x3FF) << 10) + (surrogate & 0x3FF);
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return unicode;
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}
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inline std::string codePointToUTF8(unsigned int cp)
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{
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std::string result;
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// based on description from http://en.wikipedia.org/wiki/UTF-8
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if (cp <= 0x7f)
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{
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result.resize(1);
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result[0] = static_cast<char>(cp);
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}
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else if (cp <= 0x7FF)
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{
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result.resize(2);
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result[1] = static_cast<char>(0x80 | (0x3f & cp));
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result[0] = static_cast<char>(0xC0 | (0x1f & (cp >> 6)));
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}
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else if (cp <= 0xFFFF)
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{
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result.resize(3);
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result[2] = static_cast<char>(0x80 | (0x3f & cp));
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result[1] = 0x80 | static_cast<char>((0x3f & (cp >> 6)));
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result[0] = 0xE0 | static_cast<char>((0xf & (cp >> 12)));
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}
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else if (cp <= 0x10FFFF)
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{
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result.resize(4);
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result[3] = static_cast<char>(0x80 | (0x3f & cp));
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result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
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result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
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result[0] = static_cast<char>(0xF0 | (0x7 & (cp >> 18)));
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}
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return result;
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}
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template <typename istream>
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inline const std::string &Reader<istream>::MatchString(InputStream& inputStream)
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{
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MatchExpectedString(inputStream, "\"");
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buffer.resize(0);
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std::string &string = buffer;
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while (inputStream.EOS() == false &&
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inputStream.Peek() != '"')
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{
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char c = inputStream.Get();
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// escape?
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if (c == '\\' &&
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inputStream.EOS() == false) // shouldn't have reached the end yet
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{
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c = inputStream.Get();
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switch (c) {
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case '/': string.push_back('/'); break;
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case '"': string.push_back('"'); break;
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case '\\': string.push_back('\\'); break;
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case 'b': string.push_back('\b'); break;
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case 'f': string.push_back('\f'); break;
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case 'n': string.push_back('\n'); break;
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case 'r': string.push_back('\r'); break;
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case 't': string.push_back('\t'); break;
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case 'u':
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{
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string += codePointToUTF8(decodeUnicodeCodePoint(inputStream));
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}
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break;
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default: {
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std::string sMessage = std::string("Unrecognized escape sequence found in string: \\") + c;
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throw ScanException(sMessage, inputStream.GetLocation());
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}
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}
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}
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else {
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string.push_back(c);
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}
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}
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// eat the last '"' that we just peeked
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MatchExpectedString(inputStream, "\"");
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// all's well if we made it here
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return buffer;
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}
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template <typename istream>
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inline Number::ValueType Reader<istream>::MatchNumber(InputStream& inputStream)
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{
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const int MAX_BUF=255;
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char buffer[MAX_BUF+1];
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char p = 0;
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while (p<MAX_BUF && inputStream.EOS() == false &&
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numericChars.find(inputStream.Peek()) != numericChars.end())
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{
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buffer[p++] = inputStream.Get();
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}
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buffer[p] = 0;
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#ifdef JSON_USE_STRING_AS_NUMBER
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return json::NumberString(buffer);
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#else
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int base=0;
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char *end;
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return strtol(buffer,&end, base);
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#endif
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}
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template <typename istream>
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inline void Reader<istream>::Parse(UnknownElement& element, Reader::TokenStream& tokenStream)
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{
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const Token& token = tokenStream.Peek();
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switch (token.nType) {
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case Token::TOKEN_OBJECT_BEGIN:
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{
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// implicit non-const cast will perform conversion for us (if necessary)
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Object& object = element;
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Parse(object, tokenStream);
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break;
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}
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case Token::TOKEN_ARRAY_BEGIN:
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{
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Array& array = element;
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Parse(array, tokenStream);
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break;
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}
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case Token::TOKEN_STRING:
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{
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String& string = element;
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Parse(string, tokenStream);
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break;
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}
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case Token::TOKEN_NUMBER:
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{
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Number& number = element;
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Parse(number, tokenStream);
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break;
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}
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case Token::TOKEN_BOOLEAN:
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{
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Boolean& boolean = element;
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Parse(boolean, tokenStream);
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break;
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}
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case Token::TOKEN_NULL:
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{
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Null& null = element;
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Parse(null, tokenStream);
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break;
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}
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default:
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{
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std::string sMessage = std::string("Unexpected token: ") + token.sValue;
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throw ParseException(sMessage, token.locBegin, token.locEnd);
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}
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}
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}
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template <typename istream>
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inline void Reader<istream>::Parse(Object& object, Reader::TokenStream& tokenStream)
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{
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MatchExpectedToken(Token::TOKEN_OBJECT_BEGIN, tokenStream);
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bool bContinue = (tokenStream.EOS() == false &&
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tokenStream.Peek().nType != Token::TOKEN_OBJECT_END);
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while (bContinue)
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{
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Object::Member member;
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// first the member name. save the token in case we have to throw an exception
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const Token& tokenName = tokenStream.Peek();
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member.name = MatchExpectedToken(Token::TOKEN_STRING, tokenStream);
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// ...then the key/value separator...
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MatchExpectedToken(Token::TOKEN_MEMBER_ASSIGN, tokenStream);
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// ...then the value itself (can be anything).
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Parse(member.element, tokenStream);
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// try adding it to the object (this could throw)
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try
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{
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object.Insert(member);
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}
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catch (Exception&)
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{
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// must be a duplicate name
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std::string sMessage = std::string("Duplicate object member token: ") + member.name;
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throw ParseException(sMessage, tokenName.locBegin, tokenName.locEnd);
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}
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bContinue = (tokenStream.EOS() == false &&
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tokenStream.Peek().nType == Token::TOKEN_NEXT_ELEMENT);
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if (bContinue)
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MatchExpectedToken(Token::TOKEN_NEXT_ELEMENT, tokenStream);
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}
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MatchExpectedToken(Token::TOKEN_OBJECT_END, tokenStream);
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}
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template <typename istream>
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inline void Reader<istream>::Parse(Array& array, Reader::TokenStream& tokenStream)
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{
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MatchExpectedToken(Token::TOKEN_ARRAY_BEGIN, tokenStream);
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bool bContinue = (tokenStream.EOS() == false &&
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tokenStream.Peek().nType != Token::TOKEN_ARRAY_END);
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while (bContinue)
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{
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// ...what's next? could be anything
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Array::iterator itElement = array.Insert(UnknownElement());
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UnknownElement& element = *itElement;
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Parse(element, tokenStream);
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bContinue = (tokenStream.EOS() == false &&
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tokenStream.Peek().nType == Token::TOKEN_NEXT_ELEMENT);
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if (bContinue)
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MatchExpectedToken(Token::TOKEN_NEXT_ELEMENT, tokenStream);
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}
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MatchExpectedToken(Token::TOKEN_ARRAY_END, tokenStream);
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}
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template <typename istream>
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inline void Reader<istream>::Parse(String& string, Reader::TokenStream& tokenStream)
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{
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string = MatchExpectedToken(Token::TOKEN_STRING, tokenStream);
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}
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template <typename istream>
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inline void Reader<istream>::Parse(Number& number, Reader::TokenStream& tokenStream)
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{
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/*
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#ifdef JSON_USE_STRING_AS_NUMBER
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const std::string& sValue = MatchExpectedToken(Token::TOKEN_NUMBER, tokenStream);
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// std::istringstream iStr(sValue);
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Number::ValueType dValue;
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// iStr >> dValue;
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int base=0;
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char *end;
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const char *s = sValue.c_str();
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dValue = strtol(s, &end, base);
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// did we consume all characters in the token?
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if (*end != '\0')
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// if (iStr.eof() == false)
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{
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// char c = iStr.peek();
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char c = *end;
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std::string sMessage = std::string("Unexpected character in NUMBER token: ") + c;
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throw ParseException(sMessage, currentToken.locBegin, currentToken.locEnd);
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}
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number = dValue;
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#else
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*/
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const Token& currentToken = tokenStream.Get(); // might need this later for throwing exception
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number = currentToken.nValue;
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//#endif
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}
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template <typename istream>
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inline void Reader<istream>::Parse(Boolean& boolean, Reader::TokenStream& tokenStream)
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{
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const std::string& sValue = MatchExpectedToken(Token::TOKEN_BOOLEAN, tokenStream);
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boolean = (sValue == "true" ? true : false);
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}
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template <typename istream>
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inline void Reader<istream>::Parse(Null&, Reader::TokenStream& tokenStream)
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{
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MatchExpectedToken(Token::TOKEN_NULL, tokenStream);
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}
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} // End namespace
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