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-rw-r--r--external_libs/yaml-cpp/src/exp.cpp113
1 files changed, 113 insertions, 0 deletions
diff --git a/external_libs/yaml-cpp/src/exp.cpp b/external_libs/yaml-cpp/src/exp.cpp
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+++ b/external_libs/yaml-cpp/src/exp.cpp
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+#include "exp.h"
+#include "yaml-cpp/exceptions.h"
+#include <sstream>
+
+namespace YAML
+{
+ namespace Exp
+ {
+ unsigned ParseHex(const std::string& str, const Mark& mark)
+ {
+ unsigned value = 0;
+ for(std::size_t i=0;i<str.size();i++) {
+ char ch = str[i];
+ int digit = 0;
+ if('a' <= ch && ch <= 'f')
+ digit = ch - 'a' + 10;
+ else if('A' <= ch && ch <= 'F')
+ digit = ch - 'A' + 10;
+ else if('0' <= ch && ch <= '9')
+ digit = ch - '0';
+ else
+ throw ParserException(mark, ErrorMsg::INVALID_HEX);
+
+ value = (value << 4) + digit;
+ }
+
+ return value;
+ }
+
+ std::string Str(unsigned ch)
+ {
+ return std::string(1, static_cast<char>(ch));
+ }
+
+ // Escape
+ // . Translates the next 'codeLength' characters into a hex number and returns the result.
+ // . Throws if it's not actually hex.
+ std::string Escape(Stream& in, int codeLength)
+ {
+ // grab string
+ std::string str;
+ for(int i=0;i<codeLength;i++)
+ str += in.get();
+
+ // get the value
+ unsigned value = ParseHex(str, in.mark());
+
+ // legal unicode?
+ if((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) {
+ std::stringstream msg;
+ msg << ErrorMsg::INVALID_UNICODE << value;
+ throw ParserException(in.mark(), msg.str());
+ }
+
+ // now break it up into chars
+ if(value <= 0x7F)
+ return Str(value);
+ else if(value <= 0x7FF)
+ return Str(0xC0 + (value >> 6)) + Str(0x80 + (value & 0x3F));
+ else if(value <= 0xFFFF)
+ return Str(0xE0 + (value >> 12)) + Str(0x80 + ((value >> 6) & 0x3F)) + Str(0x80 + (value & 0x3F));
+ else
+ return Str(0xF0 + (value >> 18)) + Str(0x80 + ((value >> 12) & 0x3F)) +
+ Str(0x80 + ((value >> 6) & 0x3F)) + Str(0x80 + (value & 0x3F));
+ }
+
+ // Escape
+ // . Escapes the sequence starting 'in' (it must begin with a '\' or single quote)
+ // and returns the result.
+ // . Throws if it's an unknown escape character.
+ std::string Escape(Stream& in)
+ {
+ // eat slash
+ char escape = in.get();
+
+ // switch on escape character
+ char ch = in.get();
+
+ // first do single quote, since it's easier
+ if(escape == '\'' && ch == '\'')
+ return "\'";
+
+ // now do the slash (we're not gonna check if it's a slash - you better pass one!)
+ switch(ch) {
+ case '0': return std::string(1, '\x00');
+ case 'a': return "\x07";
+ case 'b': return "\x08";
+ case 't':
+ case '\t': return "\x09";
+ case 'n': return "\x0A";
+ case 'v': return "\x0B";
+ case 'f': return "\x0C";
+ case 'r': return "\x0D";
+ case 'e': return "\x1B";
+ case ' ': return "\x20";
+ case '\"': return "\"";
+ case '\'': return "\'";
+ case '\\': return "\\";
+ case '/': return "/";
+ case 'N': return "\x85";
+ case '_': return "\xA0";
+ case 'L': return "\xE2\x80\xA8"; // LS (#x2028)
+ case 'P': return "\xE2\x80\xA9"; // PS (#x2029)
+ case 'x': return Escape(in, 2);
+ case 'u': return Escape(in, 4);
+ case 'U': return Escape(in, 8);
+ }
+
+ std::stringstream msg;
+ throw ParserException(in.mark(), std::string(ErrorMsg::INVALID_ESCAPE) + ch);
+ }
+ }
+}