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|
/* Generated by re2c */
#line 1 "ctx.re"
// re2c $INPUT -o $OUTPUT
#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;
};
#define YYCTYPE char
#define YYCURSOR s.cur
#define YYLIMIT s.lim
#define YYMARKER s.ptr
#define YYCTXMARKER s.ctx
#define YYFILL(n)
enum What
{
UNEXPECTED,
KEYWORD,
NUMBER,
EOI
};
char * tokens[] = { "UNEXPECTED", "KEYWORD", "NUMBER", "EOI" };
int scan(Scanner &s)
{
YYCTYPE *cursor = s.cur;
if(cursor == s.lim)
return EOI;
std:
s.tok = cursor;
#line 51 "ctx.c"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 3) YYFILL(3);
yych = *YYCURSOR;
switch (yych) {
case '\t':
case '\n':
case ' ': goto yy3;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy4;
case 'a':
case 'b': goto yy6;
default: goto yy1;
}
yy1:
++YYCURSOR;
yy2:
#line 61 "ctx.re"
{
return UNEXPECTED;
}
#line 81 "ctx.c"
yy3:
++YYCURSOR;
#line 54 "ctx.re"
{
if(s.cur == s.lim)
return EOI;
cursor = s.cur;
goto std;
}
#line 91 "ctx.c"
yy4:
++YYCURSOR;
if (YYLIMIT <= YYCURSOR) YYFILL(1);
yych = *YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy4;
default: goto yy5;
}
yy5:
#line 51 "ctx.re"
{ return NUMBER; }
#line 112 "ctx.c"
yy6:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
YYCTXMARKER = YYCURSOR;
goto yy7;
case '1':
YYCTXMARKER = YYCURSOR;
goto yy9;
default: goto yy2;
}
yy7:
++YYCURSOR;
if (YYLIMIT <= YYCURSOR) YYFILL(1);
yych = *YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy7;
default: goto yy8;
}
yy8:
YYCURSOR = YYCTXMARKER;
#line 50 "ctx.re"
{ return KEYWORD; }
#line 153 "ctx.c"
yy9:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy7;
default: goto yy10;
}
yy10:
YYCURSOR -= 1;
#line 49 "ctx.re"
{ return KEYWORD; }
#line 173 "ctx.c"
}
#line 64 "ctx.re"
}
#line 179 "ctx.c"
#define YYMAXFILL 3
#line 67 "ctx.re"
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;
}
}
|
