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koreader/frontend/util.lua

51 lines
1.6 KiB
Lua

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
return util