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local floor = math.floor
-- search value in table with ranges
-- source: Xindex
local function binary_range_search(code_point, ranges)
local low, mid, high
low, high = 1, #ranges
while low <= high do
mid = floor((low + high) / 2)
local range = ranges[mid]
if code_point < range[1] then
high = mid - 1
elseif code_point <= range[2] then
return range, mid
else
low = mid + 1
end
end
return nil, mid
end
local function get_range(block, blocks)
for _,v in ipairs(blocks) do
if v.name == block then return v.min, v.max end
end
end
-- variables used for test whether the value lies inside range that should be moved
local inside_block = 1
local dont_move = 0
local move = -1
local function get_search_table(min, max, max_value, blocks)
-- prepare table with ranges for search
local minimal_others = blocks.minimal_others
local lower_range = min < minimal_others and min - 1 or minimal_others
-- construct search table
local search = {
{min, max, inside_block}, -- codes inside moved block
{0, lower_range, dont_move}, -- codes that will not move
{max + 1, max_value, dont_move} -- codes above moved block
}
if min > minimal_others then -- codes need to be renumbered only when the code is moved back
table.insert(search, {minimal_others + 1, min -1, move}) -- codes that need to be renumbered
end
table.sort(search, function(a,b) return a[1] < b[1] end)
return search
end
local function clasify_blocks(blocks, search)
-- find whether block should be moved
for _, x in ipairs(blocks) do
local status, mid = binary_range_search(x.min, search)
local status_value = status[3]
x.status = status_value
end
end
local function renumber_block(block, min, max, move)
local newmin, newmax = min + move, max + move
block.move = (block.move or 0) + move
return newmin, newmax
end
local function renumber_blocks(blocks, min, max)
local move_offset = max - min + 1
for k,v in ipairs(blocks) do
-- set default value that will be used for the block moving
v.move = v.move or 0
if v.status == move then
renumber_block(v, v.min, v.max, move_offset)
elseif v.status == inside_block then
local move = blocks.minimal_others - max + move_offset
newmin, newmax = renumber_block(v, v.min, v.max, move)
blocks.minimal_others = newmax + 1
end
end
end
local function reorder(what, blocks)
local min, max = get_range(what, blocks)
local max_value = blocks[#blocks].max -- find maximal value in blocks
if what == "others" or what == "Zzzz" then
-- when reordering others, don't move anything, just set the
-- minimal_others to the maximal value, so the next reordering will move
-- the reordered block behind all others
blocks.minimal_others = max_value + 1
return
end
if not min then return nil, "Cannot find block for reordering" end
local search = get_search_table(min, max, max_value, blocks)
clasify_blocks(blocks, search)
renumber_blocks(blocks, min, max)
return blocks
end
local function reorder_collator(collator, blocks)
local function prepare_search_table(blocks)
-- make search table for collator weights
-- initialize it with block that contain all values bellow the minimal block
local search = {{0, blocks[1].min - 1, 0}}
for _, block in ipairs(blocks) do
-- return move value for each script block
local t = {block.min, block.max, block.move}
search[#search+1] = t
end
return search
end
local function update_value(value, search)
-- find the move offset for the primary weight in the reordering table
local first = value[1][1]
local status = binary_range_search(first, search) or {}
local move = status[3] or 0
if move ~= 0 then
-- detect if we need to recalculate the primary weight
value[1][1] = first + move
end
return value
end
local function update_weights(entry, search)
-- recursivelly process weighgs for the current codepoint
if entry.value then
entry.value = update_value(entry.value, search)
end
if entry.children then
update_weights(entry.children, search)
end
end
local search = prepare_search_table(blocks)
for _, current in pairs(collator.codes) do
update_weights(current, search)
end
-- clear sortkey cache
collator.stringcache = {}
end
-----------------------
-- tailoring support --
-- --------------------
local tailoring_table = {1, 0, 0}
local secondary_tailoring = {0, 1, 0}
local tertiary_tailoring = {0, 0, 1}
local equal_tailoring= {0, 0, 0}
local function equal_string(collator_obj,base, target)
collator_obj:equal(collator_obj:string_to_codepoints(base), collator_obj:string_to_codepoints(target))
end
local function tailor_string(collator_obj, str)
-- cupport the cldr strings in the form: &D<<đ<<<Đ<<ð<<<Ð
-- it is important that the strings are in the NFC normal form
-- the CLDR XML files are in NFD, so they need to be converted
-- for example using `uconv -x any-nfc < file.xml`
local function tailor(a, b, tbl)
local autf = collator_obj:string_to_codepoints(a)
local butf = collator_obj:string_to_codepoints(b)
collator_obj:tailor(autf,butf, tbl)
end
local function tailor_equal(base, target)
equal_string(collator_obj, base, target)
end
local function tailor_primary(a,b) tailor(a,b, tailoring_table) end
local function tailor_secondary(a,b) tailor(a,b, secondary_tailoring) end
local function tailor_tertiary(a,b) tailor(a,b, tertiary_tailoring) end
local functions = {["<"] = tailor_primary, ["<<"] = tailor_secondary, ["<<<"] = tailor_tertiary, ["="] = tailor_equal}
local first = str:match("^&?([^%<^%=]+)")
for fn, second in str:gmatch("([<=]+)([^<^%=]+)") do
local exec = functions[fn]
exec(first, second)
first = second -- set the current second object as first for the next round
end
end
local M = {}
M.reorder = reorder
M.reorder_collator = reorder_collator
M.tailor_string = tailor_string
return M
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