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79 lines
2.6 KiB
Plaintext
79 lines
2.6 KiB
Plaintext
module std::sort;
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import std::sort::is;
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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, list, context) : "Expected a comparison function which compares values"
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*>
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macro void insertionsort(list, cmp = EMPTY_MACRO_SLOT, context = EMPTY_MACRO_SLOT) @builtin @safemacro
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{
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$if $kindof(list) == SLICE:
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is::isort{$typeof(list), $typeof(cmp), $typeof(context)}(list, 0, lengthof(list), cmp, context);
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$else
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is::isort{$typeof(*list), $typeof(cmp), $typeof(context)}(list, 0, lengthof(*list), cmp, context);
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$endif
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}
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module std::sort::is <Type, CmpFn, Context>;
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alias ElementType = $typeof(((Type){})[0]);
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const bool IS_SLICE = Type.kindof == SLICE;
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alias ListType = $typefrom(IS_SLICE ??? Type : Type*);
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macro ElementType list_get(ListType l, i) => IS_SLICE ??? l[i] : (*l)[i];
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macro ElementType* list_get_ref(ListType l, i) => IS_SLICE ??? &l[i] : &(*l)[i];
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fn void isort(ListType list, usz low, usz high, CmpFn comp, Context context)
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{
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var $has_cmp = @is_valid_macro_slot(comp);
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var $has_context = @is_valid_macro_slot(context);
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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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