| 1 | #include <fstream.hfa>
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| 2 |
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| 3 | struct S { int i, j; };
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| 4 | void ?{}( S & s ) { s.[i, j] = 0; }
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| 5 | void ?{}( S & s, int i ) { s.[i, j] = [i, 0]; }
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| 6 | void ?{}( S & s, int i, int j ) { s.[i, j] = [i, j]; }
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| 7 | void ?{}( S & s, zero_t ) { s.[i, j] = 0; }
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| 8 | void ?{}( S & s, one_t ) { s.[i, j] = 1; }
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| 9 | int ?<?( S t1, S t2 ) { return t1.i < t2.i && t1.j < t2.j; }
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| 10 | int ?<=?( S t1, S t2 ) { return t1.i <= t2.i && t1.j <= t2.j; }
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| 11 | int ?>?( S t1, S t2 ) { return t1.i > t2.i && t1.j > t2.j; }
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| 12 | int ?>=?( S t1, S t2 ) { return t1.i >= t2.i && t1.j >= t2.j; }
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| 13 | S ?=?( S & t1, S t2 ) { t1.i = t2.i; t1.j = t2.j; return t1; }
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| 14 | S ?+=?( S & t1, S t2 ) { t1.i += t2.i; t1.j += t2.j; return t1; }
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| 15 | S ?+=?( S & t, one_t ) { t.i += 1; t.j += 1; return t; }
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| 16 | S ?-=?( S & t1, S t2 ) { t1.i -= t2.i; t1.j -= t2.j; return t1; }
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| 17 | S ?-=?( S & t, one_t ) { t.i -= 1; t.j -= 1; return t; }
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| 18 | ofstream & ?|?( ofstream & os, S v ) { return os | '(' | v.i | v.j | ')'; }
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| 19 | void & ?|?( ofstream & os, S v ) { (ofstream &)(os | v); ends( os ); }
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| 20 |
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| 21 | int main() {
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| 22 | sout | nlOff; // turn off auto newline
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| 23 |
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| 24 | // Special cases print warning: else clause never executed for empty loop conditional.
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| 25 |
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| 26 | while () { sout | "empty"; break; } else { sout | "else"; } sout | nl;
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| 27 | do { sout | "empty"; break; } while () else { sout | "else"; } sout | nl;
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| 28 | for () { sout | "empty"; break; } else { sout | "else"; } sout | nl;
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| 29 |
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| 30 | // Test some loop options.
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| 31 |
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| 32 | while ( true ) { sout | "empty"; break; } else { sout | "else"; } sout | nl;
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| 33 | do { sout | "empty"; break; } while ( true ) else { sout | "else"; } sout | nl;
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| 34 | for ( ;; ) { sout | "empty"; break; } else { sout | "else"; } sout | nl;
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| 35 | for ( ; true ; ) { sout | "empty"; break; } else { sout | "else"; } sout | nl | nl;
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| 36 |
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| 37 | while ( false ) { sout | "false"; break; } else { sout | "else"; } sout | nl;
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| 38 | for ( ; false; ) { sout | "false"; break; } else { sout | "else"; } sout | nl;
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| 39 | do { sout | "false"; } while (false) else { sout | "else"; } sout | nl | nl;
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| 40 |
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| 41 | for ( 0 ) { sout | "A"; } else { sout | "else"; } sout | "zero" | nl;
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| 42 | for ( 1 ) { sout | "A"; } else { sout | "else"; } sout | nl;
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| 43 | for ( 10 ) { sout | "A"; } else { sout | "else"; } sout | nl;
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| 44 | for ( ~= 10 ) { sout | "A"; } else { sout | "else"; } sout | nl;
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| 45 | for ( 1 ~= 10 ~ 2 ) { sout | "B"; } else { sout | "else"; } sout | nl;
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| 46 | for ( 1 -~= 10 ~ 2 ) { sout | "C"; } else { sout | "else"; } sout | nl;
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| 47 | for ( 0.5 ~ 5.5 ) { sout | "D"; } else { sout | "else"; } sout | nl;
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| 48 | for ( 0.5 -~ 5.5 ) { sout | "E"; } else { sout | "else"; } sout | nl | nl;
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| 49 |
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| 50 | for ( i; 10 ) { sout | i; } else { sout | "else"; } sout | nl;
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| 51 | for ( i; ~= 10 ) { sout | i; } else { sout | "else"; } sout | nl;
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| 52 | for ( i; 1 ~= 10 ~ 2 ) { sout | i; } else { sout | "else"; } sout | nl;
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| 53 | for ( i; 1 -~= 10 ~ 2 ) { sout | i; } else { sout | "else"; } sout | nl;
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| 54 | for ( i; 0.5 ~ 5.5 ) { sout | i; } else { sout | "else"; } sout | nl;
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| 55 | for ( i; 0.5 -~ 5.5 ) { sout | i; } else { sout | "else"; } sout | nl;
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| 56 | for ( ui; 2u ~= 10u ~ 2u ) { sout | ui; } else { sout | "else"; } sout | nl;
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| 57 | for ( ui; 2u -~= 10u ~ 2u ) { sout | ui; } else { sout | "else"; } sout | nl | nl;
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| 58 |
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| 59 | // @ means do nothing
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| 60 |
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| 61 | for ( i; 1 ~ @ ) {
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| 62 | if ( i > 10 ) break;
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| 63 | sout | i;
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| 64 | } else { sout | "else"; } sout | nl;
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| 65 | for ( i; @ -~ 10 ) {
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| 66 | if ( i < 0 ) break;
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| 67 | sout | i;
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| 68 | } else { sout | "else"; } sout | nl;
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| 69 | for ( i; 2 ~ @ ~ 2 ) {
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| 70 | if ( i > 10 ) break;
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| 71 | sout | i;
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| 72 | } else { sout | "else"; } sout | nl;
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| 73 | for ( i; 2.1 ~ @ ~ @ ) {
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| 74 | if ( i > 10.5 ) break;
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| 75 | sout | i;
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| 76 | i += 1.7;
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| 77 | } else { sout | "else"; } sout | nl;
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| 78 | for ( i; @ -~ 10 ~ 2 ) {
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| 79 | if ( i < 0 ) break;
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| 80 | sout | i;
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| 81 | } else { sout | "else"; } sout | nl;
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| 82 | for ( i; 12.1 ~ @ ~ @ ) {
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| 83 | if ( i < 2.5 ) break;
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| 84 | sout | i;
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| 85 | i -= 1.7;
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| 86 | } else { sout | "else"; } sout | nl | nl;
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| 87 |
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| 88 | enum { N = 10 };
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| 89 | for ( N ) { sout | "N"; } else { sout | "else"; } sout | nl;
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| 90 | for ( i; N ) { sout | i; } else { sout | "else"; } sout | nl;
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| 91 | for ( i; ~= N ) { sout | i; } else { sout | "else"; } sout | nl;
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| 92 | for ( i; -~= N ) { sout | i; } else { sout | "else"; } sout | nl | nl;
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| 93 |
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| 94 | const int start = 3, comp = 10, inc = 2;
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| 95 | for ( i; start ~ comp ~ inc + 1 ) { sout | i; } else { sout | "else"; } sout | nl | nl;
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| 96 |
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| 97 | for ( i; 10 : j; -5 ~ @ ) { sout | i | j; } else { sout | "else"; } sout | nl;
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| 98 | for ( i; 10 : j; @ -~ -5 ) { sout | i | j; } else { sout | "else"; } sout | nl;
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| 99 | for ( i; 10 : j; -5 ~ @ ~ 2 ) { sout | i | j; } else { sout | "else"; } sout | nl;
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| 100 | for ( i; 10 : j; @ -~ -5 ~ 2 ) { sout | i | j; } else { sout | "else"; } sout | nl | nl;
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| 101 |
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| 102 | for ( j; -5 ~ @ : i; 10 ) { sout | i | j; } else { sout | "else"; } sout | nl;
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| 103 | for ( j; @ -~ -5 : i; 10 ) { sout | i | j; } else { sout | "else"; } sout | nl;
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| 104 | for ( j; -5 ~ @ ~ 2 : i; 10 ) { sout | i | j; } else { sout | "else"; } sout | nl;
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| 105 | for ( j; @ -~ -5 ~ 2 : i; 10 ) { sout | i | j; } else { sout | "else"; } sout | nl | nl;
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| 106 |
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| 107 | for ( j; @ -~ -5 ~ 2 : i; 10 : k; 1.5 ~ @ ) { sout | i | j | k; } else { sout | "else"; } sout | nl;
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| 108 | for ( j; @ -~ -5 ~ 2 : k; 1.5 ~ @ : i; 10 ) { sout | i | j | k; } else { sout | "else"; } sout | nl;
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| 109 | for ( k; 1.5 ~ @ : j; @ -~ -5 ~ 2 : i; 10 ) { sout | i | j | k; } else { sout | "else"; } sout | nl;
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| 110 |
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| 111 | for ( S s = (S){0}; s < (S){10,10}; s += (S){1} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 112 | for ( s; (S){10,10} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 113 | sout | nl;
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| 114 | for ( s; (S){0} ~ (S){10,10} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 115 | for ( s; (S){0} ~ (S){10,10} ~ (S){1} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 116 | for ( s; (S){0} ~= (S){10,10} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 117 | for ( s; (S){0} ~= (S){10,10} ~ (S){1} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 118 | sout | nl;
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| 119 | for ( s; (S){0} -~ (S){10,10} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 120 | for ( s; (S){0} -~ (S){10,10} ~ (S){1} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 121 | for ( s; (S){0} -~= (S){10,10} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 122 | for ( s; (S){0} -~= (S){10,10} ~ (S){1} ) { sout | s; } else { sout | "else"; } sout | nl;
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| 123 | sout | nl;
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| 124 |
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| 125 | // A break (or a continue) in an else clause should target an outer loop.
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| 126 |
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| 127 | sout | "before";
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| 128 | while ( true ) {
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| 129 | sout | " begin";
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| 130 | while ( false ) {
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| 131 | sout | "never";
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| 132 | } else {
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| 133 | sout | " else";
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| 134 | break;
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| 135 | }
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| 136 | sout | " end";
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| 137 | }
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| 138 | sout | " after" | nl;
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| 139 | }
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