Sorting and searching
From Apache OpenOffice Wiki
Neither Apache OpenOffice Basic nor the API provide methods or functions for sorting arrays or searching within arrays.
It is quite common to sort almost sorted arrays, for example the list of style names belonging to a style family. Thus, I have found the shell sort to be the fastest for most uses in Apache OpenOffice:
sub subShellSort(mArray) dim n as integer, h as integer, i as integer, j as integer, t as string, Ub as integer, LB as integer Lb = lBound(mArray) Ub = uBound(mArray) ' compute largest increment n = Ub - Lb + 1 h = 1 if n > 14 then do while h < n h = 3 * h + 1 loop h = h \ 3 h = h \ 3 end if do while h > 0 ' sort by insertion in increments of h for i = Lb + h to Ub t = mArray(i) for j = i - h to Lb step -h if strComp(mArray(j), t, 0) < 1 then exit for mArray(j + h) = mArray(j) next j mArray(j + h) = t next i h = h \ 3 loop end sub
Searching in a sorted list is comparatively efficient with a binary search:
function fnBinarySearch(a, v) nLeft = 0 nRight = uBound(a) nLen = len(v) while nLeft <= nRight nMid = int((nLeft + nRight)/2) if left(a(nMid), nLen) = v then fnBinarySearch = nMid exit function elseif v < a(nMid) then nRight = nMid - 1 else nLeft = nMid + 1 end if wend fnBinarySearch = -1 end function