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local lowers = {}
local uppers = {}
for c in ('abcdefghijklmnopqrstuvwxyz'):gmatch '.' do
lowers[c] = true
uppers[c:upper()] = true
end
---@param input string
---@param other string
local function isValidFirstChar(input, other)
local first = input:sub(1, 1):upper()
if first == other:sub(1, 1):upper() then
return true
end
local pos = other:find(first, 2, true)
if not pos and uppers[first] then
-- word after symbol?
if other:find('%A' .. first:lower(), 2) then
return true
end
end
if not pos then
return false
end
local char = other:sub(pos, pos)
-- symbol?
if not uppers[char] then
return true
end
-- word boundary?
local beforeChar = other:sub(pos - 1, pos - 1)
if not uppers[beforeChar] then
return true
end
return false
end
local function isAlmostSame(input, other)
local lMe = input:lower()
local lOther = other:lower()
if lMe == lOther:sub(1, #lMe) then
return true
end
local chars = {}
for i = 1, #lOther do
local c = lOther:sub(i, i)
chars[c] = (chars[c] or 0) + 1
end
for i = 1, #lMe do
local c = lMe:sub(i, i)
if chars[c] and chars[c] > 0 then
chars[c] = chars[c] - 1
else
return false
end
end
return true
end
---@param input string
---@param other string
---@param fast boolean
---@return boolean isMatch
---@return number deviation
return function (input, other, fast)
if input == other then
return true, 0
end
if input == '' then
return true, 0
end
if #input > #other then
return false, 0
end
if fast and input:sub(1, 1) ~= other:sub(1, 1) then
return false, 0
end
if not isValidFirstChar(input, other) then
return false, 0
end
if not isAlmostSame(input, other) then
return false, 0
end
return true, 1
end
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