114 lines
3.0 KiB
C++
114 lines
3.0 KiB
C++
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#include "exp.h"
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#include "exceptions.h"
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#include <sstream>
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namespace YAML
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{
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namespace Exp
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{
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unsigned ParseHex(const std::string& str, const Mark& mark)
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{
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unsigned value = 0;
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for(std::size_t i=0;i<str.size();i++) {
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char ch = str[i];
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int digit = 0;
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if('a' <= ch && ch <= 'f')
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digit = ch - 'a' + 10;
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else if('A' <= ch && ch <= 'F')
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digit = ch - 'A' + 10;
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else if('0' <= ch && ch <= '9')
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digit = ch - '0';
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else
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throw ParserException(mark, ErrorMsg::INVALID_HEX);
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value = (value << 4) + digit;
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}
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return value;
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}
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std::string Str(unsigned ch)
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{
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return std::string(1, static_cast<char>(ch));
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}
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// Escape
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// . Translates the next 'codeLength' characters into a hex number and returns the result.
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// . Throws if it's not actually hex.
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std::string Escape(Stream& in, int codeLength)
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{
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// grab string
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std::string str;
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for(int i=0;i<codeLength;i++)
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str += in.get();
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// get the value
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unsigned value = ParseHex(str, in.mark());
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// legal unicode?
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if((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
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std::stringstream msg;
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msg << ErrorMsg::INVALID_UNICODE << value;
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throw ParserException(in.mark(), msg.str());
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}
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// now break it up into chars
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if(value <= 0x7F)
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return Str(value);
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else if(value <= 0x7FF)
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return Str(0xC0 + (value >> 6)) + Str(0x80 + (value & 0x3F));
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else if(value <= 0xFFFF)
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return Str(0xE0 + (value >> 12)) + Str(0x80 + ((value >> 6) & 0x3F)) + Str(0x80 + (value & 0x3F));
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else
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return Str(0xF0 + (value >> 18)) + Str(0x80 + ((value >> 12) & 0x3F)) +
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Str(0x80 + ((value >> 6) & 0x3F)) + Str(0x80 + (value & 0x3F));
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}
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// Escape
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// . Escapes the sequence starting 'in' (it must begin with a '\' or single quote)
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// and returns the result.
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// . Throws if it's an unknown escape character.
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std::string Escape(Stream& in)
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{
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// eat slash
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char escape = in.get();
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// switch on escape character
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char ch = in.get();
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// first do single quote, since it's easier
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if(escape == '\'' && ch == '\'')
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return "\'";
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// now do the slash (we're not gonna check if it's a slash - you better pass one!)
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switch(ch) {
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case '0': return std::string(1, '\x00');
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case 'a': return "\x07";
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case 'b': return "\x08";
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case 't':
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case '\t': return "\x09";
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case 'n': return "\x0A";
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case 'v': return "\x0B";
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case 'f': return "\x0C";
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case 'r': return "\x0D";
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case 'e': return "\x1B";
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case ' ': return "\x20";
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case '\"': return "\"";
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case '\'': return "\'";
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case '\\': return "\\";
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case '/': return "/";
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case 'N': return "\x85";
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case '_': return "\xA0";
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case 'L': return "\xE2\x80\xA8"; // LS (#x2028)
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case 'P': return "\xE2\x80\xA9"; // PS (#x2029)
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case 'x': return Escape(in, 2);
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case 'u': return Escape(in, 4);
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case 'U': return Escape(in, 8);
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}
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std::stringstream msg;
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throw ParserException(in.mark(), ErrorMsg::INVALID_ESCAPE + ch);
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}
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}
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}
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