flex-2.5.33/examples/testxxLexer.l

   1         // An example of using the flex C++ scanner class.
   2
   3 %option C++ noyywrap
   4
   5 %{
   6 int mylineno = 0;
   7 %}
   8
   9 string  \"[^\n"]+\"
  10
  11 ws      [ \t]+
  12
  13 alpha   [A-Za-z]
  14 dig     [0-9]
  15 name    ({alpha}|{dig}|\$)({alpha}|{dig}|\_|\.|\-|\/|\$)*
  16 num1    [-+]?{dig}+\.?([eE][-+]?{dig}+)?
  17 num2    [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)?
  18 number  {num1}|{num2}
  19
  20 %%
  21
  22 {ws}    /* skip blanks and tabs */
  23
  24 "/*"            {
  25                 int c;
  26
  27                 while((c = yyinput()) != 0)
  28                         {
  29                         if(c == '\n')
  30                                 ++mylineno;
  31
  32                         else if(c == '*')
  33                                 {
  34                                 if((c = yyinput()) == '/')
  35                                         break;
  36                                 else
  37                                         unput(c);
  38                                 }
  39                         }
  40                 }
  41
  42 {number}        FLEX_STD cout << "number " << YYText() << '\n';
  43
  44 \n              mylineno++;
  45
  46 {name}          FLEX_STD cout << "name " << YYText() << '\n';
  47
  48 {string}        FLEX_STD cout << "string " << YYText() << '\n';
  49
  50 %%
  51
  52 int main( int /* argc */, char** /* argv */ )
  53         {
  54         FlexLexer* lexer = new yyFlexLexer;
  55         while(lexer->yylex() != 0)
  56                 ;
  57         return 0;
  58         }