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74 lines
2.4 KiB
Plaintext
74 lines
2.4 KiB
Plaintext
module std::sort;
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<*
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Sort list using the quick sort algorithm.
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@require @list_is_by_ref(list) : "Expected a list passed by reference, or slice passed by value"
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@require @is_sortable(list) : "The list must be indexable and support .len or .len()"
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@require @is_valid_cmp_fn(#cmp: ...cmp, #list: list, #context: ...context) : "Expected a comparison function which compares values"
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*>
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macro void insertionsort(list, cmp = ..., context = ...) @builtin @safemacro
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{
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var used_cmp = $defined(cmp) ??? cmp : (TypeNotSet)null;
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var used_ctx = $defined(context) ??? context : (TypeNotSet)null;
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$if $kindof(list) == SLICE:
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isort{$typeof(list), $typeof(used_cmp), $typeof(used_ctx)}(list, 0, lengthof(list), used_cmp, used_ctx);
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$else
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isort{$typeof(*list), $typeof(used_cmp), $typeof(used_ctx)}(list, 0, lengthof(*list), used_cmp, used_ctx);
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$endif
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}
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module std::sort <Type, CmpFn, Context> @private;
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fn void isort(ListType list, usz low, usz high, CmpFn comp, Context context) @noinline @private
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{
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var $has_cmp = $typeof(comp) != TypeNotSet;
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var $has_context = $typeof(context) != TypeNotSet;
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var $cmp_by_value = $has_cmp &&& $defined($typefrom(CmpFn.paramsof[0].type) p = list_get(list, 0));
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var $has_get_ref = IS_SLICE ||| $defined(&(*list)[0]);
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for (usz i = low; i < high; ++i)
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{
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usz j = i;
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for (;j > low;)
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{
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$if $has_get_ref:
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ElementType *rhs = list_get_ref(list, j);
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ElementType *lhs = list_get_ref(list, --j);
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$switch:
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$case $cmp_by_value && $has_context:
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if (comp(*rhs, *lhs, context) >= 0) break;
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$case $cmp_by_value:
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if (comp(*rhs, *lhs) >= 0) break;
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$case $has_cmp && $has_context:
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if (comp(rhs, lhs, context) >= 0) break;
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$case $has_cmp:
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if (comp(rhs, lhs) >= 0) break;
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$default:
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if (!less(*rhs, *lhs)) break;
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$endswitch
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@swap(*rhs, *lhs);
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$else
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usz r = j;
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--j;
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$switch:
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$case $cmp_by_value && $has_context:
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if (comp(list_get(list, r), list_get(j), context) >= 0) break;
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$case $cmp_by_value:
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if (comp(list_get(list, r), list_get(j)) >= 0) break;
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$case $has_cmp && $has_context:
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if (comp(list_get_ref(list, r), list_get_ref(j), context) >= 0) break;
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$case $has_cmp:
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if (comp(list_get_ref(list, r), list_get_ref(j)) >= 0) break;
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$default:
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if (!less(list_get(list, r), list_get(j))) break;
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$endswitch
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$if IS_SLICE:
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@swap(list[r], list[j]);
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$else
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@swap((*list)[r], (*list)[j]);
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$endif
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$endif
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}
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}
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}
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