lexer.l (grabbed from the test_package/basic_nr.l)
/*
* This file is part of flex.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
*/
%option C++ noyywrap
%{
int mylineno = 0;
%}
string \"[^\n"]+\"
ws [ \t]+
alpha [A-Za-z]
dig [0-9]
name ({alpha}|{dig}|\$)({alpha}|{dig}|\_|\.|\-|\/|\$)*
num1 [-+]?{dig}+\.?([eE][-+]?{dig}+)?
num2 [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)?
number {num1}|{num2}
%%
{ws} /* skip blanks and tabs */
"/*" {
int c;
while((c = yyinput()) != 0)
{
if(c == '\n')
++mylineno;
else if(c == '*')
{
if((c = yyinput()) == '/')
break;
else
unput(c);
}
}
}
{number} std::cout << "number " << YYText() << '\n';
\n mylineno++;
{name} std::cout << "name " << YYText() << '\n';
{string} std::cout << "string " << YYText() << '\n';
%%
extern "C" {
int yylex() {return 0;}
}
#include <fstream>
int main( int argc, const char *argv[]) {
if (argc < 2) {
fprintf(stderr, "Need an argument\n");
return 1;
}
std::ifstream ifs(argv[1]);
FlexLexer *lexer = new yyFlexLexer(ifs, std::cout);
while(lexer->yylex() != 0)
;
return 0;
}
Package and Environment Details
Conan profile
Steps to reproduce
conanfile.txt
CMakeLists.txt
lexer.l (grabbed from the test_package/basic_nr.l)
Trying to build with:
The build fails with this message: