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koreader/frontend/util.lua

98 lines
3.0 KiB
Lua

--[[--
Miscellaneous helper functions for KOReader frontend.
]]
local util = {}
function util.stripePunctuations(word)
if not word then return end
-- strip ASCII punctuation characters around word
-- and strip any generic punctuation (U+2000 - U+206F) in the word
return word:gsub("\226[\128-\131][\128-\191]", ''):gsub("^%p+", ''):gsub("%p+$", '')
end
--[[
Lua doesn't have a string.split() function and most of the time
you don't really need it because string.gmatch() is enough.
However string.gmatch() has one significant disadvantage for me:
You can't split a string while matching both the delimited
strings and the delimiters themselves without tracking positions
and substrings. The gsplit function below takes care of
this problem.
Author: Peter Odding
License: MIT/X11
Source: http://snippets.luacode.org/snippets/String_splitting_130
--]]
function util.gsplit(str, pattern, capture)
pattern = pattern and tostring(pattern) or '%s+'
if (''):find(pattern) then
error('pattern matches empty string!', 2)
end
return coroutine.wrap(function()
local index = 1
repeat
local first, last = str:find(pattern, index)
if first and last then
if index < first then
coroutine.yield(str:sub(index, first - 1))
end
if capture then
coroutine.yield(str:sub(first, last))
end
index = last + 1
else
if index <= #str then
coroutine.yield(str:sub(index))
end
break
end
until index > #str
end)
end
-- https://gist.github.com/jesseadams/791673
function util.secondsToClock(seconds, withoutSeconds)
seconds = tonumber(seconds)
if seconds == 0 or seconds ~= seconds then
if withoutSeconds then
return "00:00";
else
return "00:00:00";
end
else
local hours = string.format("%02.f", math.floor(seconds / 3600));
local mins = string.format("%02.f", math.floor(seconds / 60 - (hours * 60)));
if withoutSeconds then
return hours .. ":" .. mins
end
local secs = string.format("%02.f", math.floor(seconds - hours * 3600 - mins * 60));
return hours .. ":" .. mins .. ":" .. secs
end
end
--- Returns number of keys in a table.
---- @param T Lua table
---- @return number of keys in table T
function util.tableSize(T)
local count = 0
for _ in pairs(T) do count = count + 1 end
return count
end
-- append all elements from t2 into t1
function util.arrayAppend(t1, t2)
for _, v in ipairs(t2) do
table.insert(t1, v)
end
end
-- Returns the index within this string of the last occurrence of the specified character
-- or -1 if the character does not occur.
-- To find . you need to escape it.
function util.lastIndexOf(string, ch)
local i = string:match(".*" .. ch .. "()")
if i == nil then return -1 else return i - 1 end
end
return util