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/*
* @LANG: indep
* This implementes an atoi machine using the statechart paradigm.
*/
bool neg;
int val;
%%
val = 0;
neg = false;
%%{
machine StateChart;
action begin {
neg = false;
val = 0;
}
action see_neg {
neg = true;
}
action add_digit {
val = val * 10 + (fc - 48);
}
action finish {
if ( neg )
val = -1 * val;
}
atoi = (
start: (
'-' @see_neg ->om_num |
'+' ->om_num |
[0-9] @add_digit ->more_nums
),
# One or more nums.
om_num: (
[0-9] @add_digit ->more_nums
),
# Zero ore more nums.
more_nums: (
[0-9] @add_digit ->more_nums |
'' -> final
)
) >begin %finish;
action oneof { printi val; prints "\n"; }
main := ( atoi '\n' @oneof )*;
}%%
/* _____INPUT_____
"1\n"
"12\n"
"222222\n"
"+2123\n"
"213 3213\n"
"-12321\n"
"--123\n"
"-99\n"
" -3000\n"
_____INPUT_____ */
/* _____OUTPUT_____
1
ACCEPT
12
ACCEPT
222222
ACCEPT
2123
ACCEPT
FAIL
-12321
ACCEPT
FAIL
-99
ACCEPT
FAIL
_____OUTPUT_____ */
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