f513c11ea6
x+2..=42 (expression start, 39 iterations summing 897), x+2<..<x*21 (expressions both ends, 5..41), 0..x*3 (expression end). Expression parsing stops at the range lexeme from either side, so any expression works in either position — now pinned.
64 lines
2.0 KiB
Plaintext
64 lines
2.0 KiB
Plaintext
// Range bound markers: each side of `..` takes `=` (inclusive) or `<`
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// (exclusive); defaults are start-inclusive, end-exclusive (`a..b` == `a=..<b`).
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// Covers the full matrix, open ranges with start markers, comptime unrolling,
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// runtime bounds, arbitrary expressions at EITHER end (expression parsing
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// stops at the range token), and that `<` / `<<` comparisons still lex
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// normally.
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#import "modules/std.sx";
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main :: () -> s32 {
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for 0<..<5 (i) { print("{} ", i); }
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print("| 0<..<5\n");
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for 0=..=5 (i) { print("{} ", i); }
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print("| 0=..=5\n");
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for 0<..=5 (i) { print("{} ", i); }
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print("| 0<..=5\n");
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for 0=..<5 (i) { print("{} ", i); }
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print("| 0=..<5\n");
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for 0..<5 (i) { print("{} ", i); }
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print("| 0..<5\n");
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for 0..=5 (i) { print("{} ", i); }
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print("| 0..=5\n");
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// Exclusive-start open range following a bounded first iterable.
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xs : [3]s64 = .[10, 20, 30];
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for xs, 2<.. (x, i) { print("{}@{} ", x, i); }
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print("| xs, 2<..\n");
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// Explicit inclusive-start open form (synonym of `5..`).
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for xs, 5=.. (x, i) { print("{}@{} ", x, i); }
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print("| xs, 5=..\n");
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// Comptime-unrolled with markers.
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s := 0;
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inline for 0<..=3 (i) { s += i; }
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print("inline 0<..=3 sum={}\n", s);
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// Runtime bounds with markers.
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lo := 1;
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hi := 4;
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for lo<..=hi (i) { print("{} ", i); }
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print("| lo<..=hi\n");
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// Arbitrary expressions at either end of the range token.
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x := 2;
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n := 0;
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sum := 0;
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for x+2..=42 (e) { n += 1; sum += e; } // expression start: 4 .. 42
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print("x+2..=42: n={} sum={}\n", n, sum);
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n2 := 0;
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for x+2<..<x*21 (e) => n2 += 1; // both ends: 5 .. 41
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print("x+2<..<x*21: n2={}\n", n2);
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n3 := 0;
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for 0..x*3 (i) => n3 += 1; // expression end: 0 .. 5
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print("0..x*3: n3={}\n", n3);
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// Comparison operators still lex normally.
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a := 3;
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if a < 5 { print("cmp ok\n"); }
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b := a << 1;
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print("shl={}\n", b);
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0
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}
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