source/strings/utils.cpp

   1 #include <algorithm>
   2 #include <list>
   3 #include <stdexcept>
   4 #include <cctype>
   5 #include "utils.h"
   6
   7 using namespace std;
   8
   9 namespace {
  10
  11 template<bool long_sep, bool allow_empty>
  12 vector<string> do_split(const string &str, const string &sep, int max_split)
  13 {
  14         vector<string> result;
  15
  16         unsigned start = 0;
  17         while(start<str.size())
  18         {
  19                 unsigned end = long_sep ? str.find(sep, start) : str.find_first_of(sep, start);
  20                 if(end!=start || allow_empty)
  21                 {
  22                         if(max_split>=0 && result.size()==static_cast<unsigned>(max_split))
  23                         {
  24                                 result.push_back(str.substr(start));
  25                                 break;
  26                         }
  27                         else
  28                                 result.push_back(str.substr(start, end-start));
  29                 }
  30
  31                 if(end>str.size())
  32                         break;
  33
  34                 start = end+(long_sep ? sep.size() : 1);
  35
  36                 if(allow_empty && start==str.size())
  37                         result.push_back(string());
  38         }
  39
  40         return result;
  41 }
  42
  43 bool check_str(const std::string &str, int (*pred)(int))
  44 {
  45         for(string::const_iterator i=str.begin(); i!=str.end(); ++i)
  46                 if(!pred(*i))
  47                         return false;
  48         return true;
  49 }
  50
  51 }
  52
  53
  54 namespace Msp {
  55
  56 int strcasecmp(const string &s1, const string &s2)
  57 {
  58         string::const_iterator i1 = s1.begin();
  59         string::const_iterator i2 = s2.begin();
  60         for(; (i1!=s1.end() && i2!=s2.end()); ++i1, ++i2)
  61         {
  62                 const char c1 = ::tolower(*i1);
  63                 const char c2 = ::tolower(*i2);
  64                 if(c1!=c2) return c1-c2;
  65         }
  66         if(i1!=s1.end()) return *i1;
  67         if(i2!=s2.end()) return -*i2;
  68         return 0;
  69 }
  70
  71 string tolower(const string &str)
  72 {
  73         string result(str);
  74         transform(result.begin(), result.end(), result.begin(), ::tolower);
  75         return result;
  76 }
  77
  78 string toupper(const string &str)
  79 {
  80         string result(str);
  81         transform(result.begin(), result.end(), result.begin(), ::toupper);
  82         return result;
  83 }
  84
  85 bool isnumrc(const string &str)
  86 {
  87         return check_str(str, isdigit);
  88 }
  89
  90 bool isalpha(const string &str)
  91 {
  92         return check_str(str, isalpha);
  93 }
  94
  95 bool isalnum(const string &str)
  96 {
  97         return check_str(str, isalnum);
  98 }
  99
 100 vector<string> split(const string &str, const string &sep, int max_split)
 101 {
 102         return do_split<false, false>(str, sep, max_split);
 103 }
 104
 105 vector<string> split(const string &str, char sep, int max_split)
 106 {
 107         return split(str, string(1, sep), max_split);
 108 }
 109
 110 vector<string> split_long(const string &str, const string &sep, int max_split)
 111 {
 112         return do_split<true, false>(str, sep, max_split);
 113 }
 114
 115 vector<string> split_fields(const string &str, const string &sep, int max_split)
 116 {
 117         return do_split<true, true>(str, sep, max_split);
 118 }
 119
 120 vector<string> split_fields(const string &str, char sep, int max_split)
 121 {
 122         return split_fields(str, string(1, sep), max_split);
 123 }
 124
 125 string strip(const string &s)
 126 {
 127         string result = s;
 128         if(!result.erase(0, result.find_first_not_of(" \t\r\n")).empty())
 129                 result.erase(result.find_last_not_of(" \t\r\n")+1);
 130         return result;
 131 }
 132
 133 string &append(string &str, const string &sep, const string &other)
 134 {
 135         if(!str.empty() && !other.empty())
 136                 str += sep;
 137         str += other;
 138         return str;
 139 }
 140
 141 string join(const string &str1, const string &sep, const string &str2)
 142 {
 143         string result = str1;
 144         return append(result, sep, str2);
 145 }
 146
 147 string c_unescape(const std::string &str)
 148 {
 149         bool escape = false;
 150         unsigned numeric_type = 0;
 151         unsigned numeric_pos = 0;
 152         unsigned numeric_value = 0;
 153         string result;
 154         for(string::const_iterator i=str.begin(); i!=str.end(); ++i)
 155         {
 156                 if(numeric_type==16)
 157                 {
 158                         unsigned digit = 0;
 159                         if(*i>='0' && *i<='9')
 160                                 digit = *i-'0';
 161                         else if(*i>='a' && *i<='f')
 162                                 digit = *i-'a'+10;
 163                         else if(*i>='A' && *i<='F')
 164                                 digit = *i-'A'+10;
 165                         else
 166                                 throw invalid_argument("c_unescape");
 167
 168                         numeric_value = (numeric_value<<4 | digit);
 169                         ++numeric_pos;
 170                         if(numeric_pos==2)
 171                         {
 172                                 result += numeric_value;
 173                                 numeric_type = 0;
 174                         }
 175                 }
 176                 else if(numeric_type==8)
 177                 {
 178                         unsigned digit = 0;
 179                         if(*i>='0' && *i<='7')
 180                                 digit = *i-'0';
 181                         else
 182                                 throw invalid_argument("c_unescape");
 183
 184                         numeric_value = (numeric_value<<3 | digit);
 185                         ++numeric_pos;
 186                         if(numeric_pos==3)
 187                         {
 188                                 result += numeric_value;
 189                                 numeric_type = 0;
 190                         }
 191                 }
 192                 else if(escape)
 193                 {
 194                         if(*i=='x')
 195                         {
 196                                 numeric_type = 16;
 197                                 numeric_pos = 0;
 198                                 numeric_value = 0;
 199                         }
 200                         else if(*i>='0' && *i<='3')
 201                         {
 202                                 numeric_type = 8;
 203                                 numeric_pos = 1;
 204                                 numeric_value = *i-'0';
 205                         }
 206                         else if(*i=='n')
 207                                 result += '\n';
 208                         else if(*i=='t')
 209                                 result += '\t';
 210                         else if(*i=='r')
 211                                 result += '\r';
 212                         else if(*i=='b')
 213                                 result += '\b';
 214                         else if(*i=='v')
 215                                 result += '\v';
 216                         else if(*i=='a')
 217                                 result += '\a';
 218                         else if(*i=='f')
 219                                 result += '\f';
 220                         else if(*i=='\"')
 221                                 result += '\"';
 222                         else if(*i=='\'')
 223                                 result += '\'';
 224                         else if(*i=='\\')
 225                                 result += '\\';
 226                         else
 227                                 throw invalid_argument("c_unescape");
 228
 229                         escape = false;
 230                 }
 231                 else if(*i=='\\')
 232                         escape = true;
 233                 else
 234                         result += *i;
 235         }
 236
 237         if(escape)
 238                 throw invalid_argument("c_unescape");
 239
 240         return result;
 241 }
 242
 243 string c_escape(const string &str, bool escape_8bit)
 244 {
 245         string result;
 246
 247         for(string::const_iterator i=str.begin(); i!=str.end(); ++i)
 248         {
 249                 if(*i=='\n')
 250                         result += "\\n";
 251                 else if(*i=='\t')
 252                         result += "\\t";
 253                 else if(*i=='\r')
 254                         result += "\\r";
 255                 else if(*i=='\b')
 256                         result += "\\b";
 257                 else if(*i=='\v')
 258                         result += "\\v";
 259                 else if(*i=='\a')
 260                         result += "\\a";
 261                 else if(*i=='\f')
 262                         result += "\\f";
 263                 else if(*i=='\"')
 264                         result += "\\\"";
 265                 else if(*i=='\'')
 266                         result += "\\\'";
 267                 else if(*i=='\\')
 268                         result += "\\\\";
 269                 else if(static_cast<unsigned char>(*i)<' ' || (escape_8bit && (*i&0x80)))
 270                 {
 271                         char buf[4] = { '\\', 0 };
 272                         for(unsigned j=0; j<3; ++j)
 273                                 buf[1+j] = '0'+((static_cast<unsigned char>(*i)>>(6-j*3))&7);
 274                         result.append(buf, 4);
 275                 }
 276                 else
 277                         result += *i;
 278         }
 279
 280         return result;
 281 }
 282
 283 } // namespace Msp