Nathan Dorfman
5 years ago
parent
4f29efe73f
commit
24936ba849
@ -0,0 +1,377 @@
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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
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// All rights reserved.
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//
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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 Andrey N. Sabelnikov nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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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 BE LIABLE FOR ANY
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// 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
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// ON 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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#pragma once
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#include <algorithm>
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#include <boost/utility/string_ref.hpp>
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "serialization"
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namespace epee
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{
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namespace misc_utils
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{
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namespace parse
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{
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// 1: digit
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// 2: .eE (floating point)
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// 4: alpha
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// 8: whitespace
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// 16: allowed in float but doesn't necessarily mean it's a float
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// 32: \ and " (end of verbatim string)
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static const constexpr uint8_t lut[256]={
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0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 0, 0, // 16
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 32
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8, 0, 32, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 16, 18, 0, // 48
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17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 0, 0, 0, 0, 0, 0, // 64
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0, 4, 4, 4, 4, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, // 80
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 32, 0, 0, 0, // 96
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0, 4, 4, 4, 4, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, // 112
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, // 128
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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static const constexpr unsigned char isx[256] =
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{
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 10, 11, 12, 13, 14, 15, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 10, 11, 12, 13, 14, 15, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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inline bool isspace(char c)
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{
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return lut[(uint8_t)c] & 8;
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}
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inline bool isdigit(char c)
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{
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return lut[(uint8_t)c] & 1;
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}
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inline std::string transform_to_escape_sequence(const std::string& src)
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{
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static const char escaped[] = "\b\f\n\r\t\v\"\\/";
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std::string::const_iterator it = std::find_first_of(src.begin(), src.end(), escaped, escaped + sizeof(escaped));
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if (it == src.end())
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return src;
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std::string res;
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res.reserve(2 * src.size());
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res.assign(src.begin(), it);
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for(; it!=src.end(); ++it)
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{
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switch(*it)
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{
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case '\b': //Backspace (ascii code 08)
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res+="\\b"; break;
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case '\f': //Form feed (ascii code 0C)
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res+="\\f"; break;
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case '\n': //New line
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res+="\\n"; break;
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case '\r': //Carriage return
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res+="\\r"; break;
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case '\t': //Tab
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res+="\\t"; break;
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case '\v': //Vertical tab
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res+="\\v"; break;
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//case '\'': //Apostrophe or single quote
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// res+="\\'"; break;
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case '"': //Double quote
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res+="\\\""; break;
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case '\\': //Backslash caracter
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res+="\\\\"; break;
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case '/': //Backslash caracter
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res+="\\/"; break;
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default:
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res.push_back(*it);
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}
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}
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return res;
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}
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/*
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\b Backspace (ascii code 08)
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\f Form feed (ascii code 0C)
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\n New line
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\r Carriage return
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\t Tab
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\v Vertical tab
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\' Apostrophe or single quote
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\" Double quote
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\\ Backslash character
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*/
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inline void match_string2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string& val)
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{
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bool escape_mode = false;
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std::string::const_iterator it = star_end_string;
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++it;
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std::string::const_iterator fi = it;
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while (fi != buf_end && ((lut[(uint8_t)*fi] & 32)) == 0)
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++fi;
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val.assign(it, fi);
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val.reserve(std::distance(star_end_string, buf_end));
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it = fi;
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for(;it != buf_end;it++)
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{
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if(escape_mode/*prev_ch == '\\'*/)
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{
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switch(*it)
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{
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case 'b': //Backspace (ascii code 08)
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val.push_back(0x08);break;
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case 'f': //Form feed (ascii code 0C)
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val.push_back(0x0C);break;
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case 'n': //New line
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val.push_back('\n');break;
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case 'r': //Carriage return
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val.push_back('\r');break;
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case 't': //Tab
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val.push_back('\t');break;
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case 'v': //Vertical tab
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val.push_back('\v');break;
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case '\'': //Apostrophe or single quote
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val.push_back('\'');break;
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case '"': //Double quote
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val.push_back('"');break;
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case '\\': //Backslash character
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val.push_back('\\');break;
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case '/': //Slash character
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val.push_back('/');break;
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case 'u': //Unicode code point
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if (buf_end - it < 4)
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{
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ASSERT_MES_AND_THROW("Invalid Unicode escape sequence");
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}
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else
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{
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uint32_t dst = 0;
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for (int i = 0; i < 4; ++i)
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{
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const unsigned char tmp = isx[(int)*++it];
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CHECK_AND_ASSERT_THROW_MES(tmp != 0xff, "Bad Unicode encoding");
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dst = dst << 4 | tmp;
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}
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// encode as UTF-8
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if (dst <= 0x7f)
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{
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val.push_back(dst);
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}
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else if (dst <= 0x7ff)
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{
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val.push_back(0xc0 | (dst >> 6));
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val.push_back(0x80 | (dst & 0x3f));
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}
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else if (dst <= 0xffff)
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{
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val.push_back(0xe0 | (dst >> 12));
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val.push_back(0x80 | ((dst >> 6) & 0x3f));
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val.push_back(0x80 | (dst & 0x3f));
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}
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else
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{
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ASSERT_MES_AND_THROW("Unicode code point is out or range");
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}
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}
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break;
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default:
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val.push_back(*it);
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LOG_PRINT_L0("Unknown escape sequence :\"\\" << *it << "\"");
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}
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escape_mode = false;
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}else if(*it == '"')
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{
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star_end_string = it;
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return;
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}else if(*it == '\\')
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{
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escape_mode = true;
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}
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else
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{
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val.push_back(*it);
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}
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}
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ASSERT_MES_AND_THROW("Failed to match string in json entry: " << std::string(star_end_string, buf_end));
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}
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inline bool match_string(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string& val)
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{
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try
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{
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match_string2(star_end_string, buf_end, val);
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return true;
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}
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catch(...)
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{
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return false;
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}
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}
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inline void match_number2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val, bool& is_float_val, bool& is_signed_val)
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{
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val.clear();
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uint8_t float_flag = 0;
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is_signed_val = false;
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size_t chars = 0;
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std::string::const_iterator it = star_end_string;
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if (it != buf_end && *it == '-')
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{
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is_signed_val = true;
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++chars;
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++it;
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}
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for(;it != buf_end;it++)
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{
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const uint8_t flags = lut[(uint8_t)*it];
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if (flags & 16)
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{
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float_flag |= flags;
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++chars;
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}
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else
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{
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val = boost::string_ref(&*star_end_string, chars);
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if(val.size())
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{
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star_end_string = --it;
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is_float_val = !!(float_flag & 2);
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return;
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}
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else
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ASSERT_MES_AND_THROW("wrong number in json entry: " << std::string(star_end_string, buf_end));
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}
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}
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ASSERT_MES_AND_THROW("wrong number in json entry: " << std::string(star_end_string, buf_end));
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}
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inline bool match_number(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val)
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{
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try
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{
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bool is_v_float = false;bool is_signed_val = false;
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match_number2(star_end_string, buf_end, val, is_v_float, is_signed_val);
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return !is_v_float;
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}
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catch(...)
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{
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return false;
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}
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}
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inline void match_word2(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val)
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{
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val.clear();
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for(std::string::const_iterator it = star_end_string;it != buf_end;it++)
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{
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if (!(lut[(uint8_t)*it] & 4))
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{
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val = boost::string_ref(&*star_end_string, std::distance(star_end_string, it));
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if(val.size())
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{
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star_end_string = --it;
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return;
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}else
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ASSERT_MES_AND_THROW("failed to match word number in json entry: " << std::string(star_end_string, buf_end));
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}
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}
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ASSERT_MES_AND_THROW("failed to match word number in json entry: " << std::string(star_end_string, buf_end));
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}
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inline bool match_word(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, boost::string_ref& val)
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{
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try
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{
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match_word2(star_end_string, buf_end, val);
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return true;
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}
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catch(...)
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{
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return false;
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}
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}
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inline bool match_word_with_extrasymb(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string& val)
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{
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val.clear();
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for(std::string::const_iterator it = star_end_string;it != buf_end;it++)
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{
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if(!isalnum(*it) && *it != '-' && *it != '_')
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{
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val.assign(star_end_string, it);
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if(val.size())
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{
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star_end_string = --it;
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return true;
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}else
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return false;
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}
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}
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return false;
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}
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inline bool match_word_til_equal_mark(std::string::const_iterator& star_end_string, std::string::const_iterator buf_end, std::string::const_iterator& word_end)
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{
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word_end = star_end_string;
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for(std::string::const_iterator it = star_end_string;it != buf_end;it++)
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{
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if(isspace(*it))
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{
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continue;
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}else if( *it == '=' )
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{
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star_end_string = it;
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word_end = it;
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return true;
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}
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}
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return false;
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}
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}
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}
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}
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