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#include <cstring>
#include <iostream>
struct Scanner
{
Scanner(char *txt)
: cur(txt), lim(txt + strlen(txt))
{
}
char *cur;
char *lim;
char *ptr;
char *ctx;
char *tok;
};
enum What
{
UNEXPECTED,
KEYWORD,
NUMBER,
EOI
};
char * tokens[] = { "UNEXPECTED", "KEYWORD", "NUMBER", "EOI" };
void fill(int)
{
}
int scan(Scanner &s)
{
char *cursor = s.cur;
if(cursor == s.lim)
return EOI;
std:
s.tok = cursor;
/*!re2c
re2c:define:YYCTYPE = char;
re2c:define:YYCURSOR = s.cur;
re2c:define:YYLIMIT = s.lim;
re2c:define:YYMARKER = s.ptr;
re2c:define:YYCTXMARKER = s.ctx;
re2c:define:YYFILL = fill;
re2c:variable:yych = curr;
re2c:labelprefix = xx;
("a"|"b")/[1] { return KEYWORD; }
("a"|"b")/[0-9]+ { return KEYWORD; }
[0-9]+ { return NUMBER; }
[ \t\n]
{
if(s.cur == s.lim)
return EOI;
cursor = s.cur;
goto std;
}
.
{
return UNEXPECTED;
}
*/
}
int main(int,char**)
{
Scanner s("a77 a1 b8 b1");
int t, n = 0;
while ((t = scan(s)) != EOI)
{
std::cout << (++n) << ": " << tokens[t] << " = \""; std::cout.write(s.tok, s.cur-s.tok); std::cout << "\"" << std::endl;
}
}
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