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// Scanner; a simple string parser.
struct scan {
int !x; // Cursor
bool !bad; // True after a malformed token
u8[~] buf; // Buffer to parse
new scan = { u8[~] b -> buf = b; };
// Skip whitespace
val skip = { ->
while( x < buf# && buf[x] <= ' ' )
x++;
return self;
};
// True if find required character, and skip it; else False.
val match = { u8 c ->
skip();
if( x >= buf# ) return false;
if( buf[x] != c ) return false;
x++;
return true;
};
// Parse a simple number
val number = { ->
skip();
bool neg = match('-');
if( x >= buf# || buf[x] < '0' || '9' < buf[x] ) {
bad = true;
return 0;
}
i64 n = 0;
while( x < buf# && '0' <= buf[x] & buf[x] <= '9' )
n = n*10 + (buf[x++] - '0');
return neg ? -n : n;
};
};
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