--[[-- This module contains miscellaneous helper functions for the KOReader frontend. ]] local BaseUtil = require("ffi/util") local util = {} --- Strips all punctuation and spaces from a string. ---- @string text the string to be stripped ---- @treturn string stripped text function util.stripePunctuations(text) if not text then return end -- strip ASCII punctuation characters around text -- and strip any generic punctuation (U+2000 - U+206F) in the text return text:gsub("\226[\128-\131][\128-\191]", ''):gsub("^%p+", ''):gsub("%p+$", '') end --[[-- Splits a string by a pattern 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 ]] ----@string str string to split ----@param pattern the pattern to split against ----@bool capture ----@bool capture_empty_entity function util.gsplit(str, pattern, capture, capture_empty_entity) 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 or (index == first and capture_empty_entity) 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 --[[-- Converts seconds to a clock string. Source: https://gist.github.com/jesseadams/791673 ]] ---- @int seconds number of seconds ---- @bool withoutSeconds if true 00:00, if false 00:00:00 ---- @treturn string clock string in the form of 00:00 or 00:00:00 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 round = withoutSeconds and require("optmath").round or math.floor local hours = string.format("%02.f", math.floor(seconds / 3600)) local mins = string.format("%02.f", round(seconds / 60 - (hours * 60))) if mins == "60" then mins = string.format("%02.f", 0) hours = string.format("%02.f", hours + 1) end 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 --[[-- Compares values in two different tables. Source: https://stackoverflow.com/a/32660766/2470572 ]] ---- @param o1 Lua table ---- @param o2 Lua table ---- @bool ignore_mt ---- @treturn boolean function util.tableEquals(o1, o2, ignore_mt) if o1 == o2 then return true end local o1Type = type(o1) local o2Type = type(o2) if o1Type ~= o2Type then return false end if o1Type ~= 'table' then return false end if not ignore_mt then local mt1 = getmetatable(o1) if mt1 and mt1.__eq then --compare using built in method return o1 == o2 end end local keySet = {} for key1, value1 in pairs(o1) do local value2 = o2[key1] if value2 == nil or util.tableEquals(value1, value2, ignore_mt) == false then return false end keySet[key1] = true end for key2, _ in pairs(o2) do if not keySet[key2] then return false end end return true end --- Returns number of keys in a table. ---- @param T Lua table ---- @treturn int 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. ---- @param t1 Lua table ---- @param t2 Lua table function util.arrayAppend(t1, t2) for _, v in ipairs(t2) do table.insert(t1, v) end end --[[-- Gets last index of string in character 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. ]] ---- @string string ---- @string ch ---- @treturn int last occurrence or -1 if not found function util.lastIndexOf(string, ch) local i = string:match(".*" .. ch .. "()") if i == nil then return -1 else return i - 1 end end --- Reverse the individual greater-than-single-byte characters -- @string string to reverse -- Taken from https://github.com/blitmap/lua-utf8-simple#utf8reverses function util.utf8Reverse(text) text = text:gsub('[%z\1-\127\194-\244][\128-\191]*', function (c) return #c > 1 and c:reverse() end) return text:reverse() end --- Splits string into a list of UTF-8 characters. ---- @string text the string to be split. ---- @treturn table list of UTF-8 chars function util.splitToChars(text) local tab = {} if text ~= nil then local prevcharcode, charcode = 0 for uchar in string.gmatch(text, "([%z\1-\127\194-\244][\128-\191]*)") do charcode = BaseUtil.utf8charcode(uchar) if prevcharcode then -- utf8 table.insert(tab, uchar) end prevcharcode = charcode end end return tab end --- Tests whether c is a CJK character ---- @string c ---- @treturn boolean true if CJK function util.isCJKChar(c) return string.match(c, "[\228-\234][\128-\191].") == c end --- Tests whether str contains CJK characters ---- @string str ---- @treturn boolean true if CJK function util.hasCJKChar(str) return string.match(str, "[\228-\234][\128-\191].") ~= nil end --- Split texts into a list of words, spaces and punctuation. ---- @string text text to split ---- @treturn table list of words, spaces and punctuation function util.splitToWords(text) local wlist = {} for word in util.gsplit(text, "[%s%p]+", true) do -- if space splitted word contains CJK characters if util.hasCJKChar(word) then -- split with CJK characters for char in util.gsplit(word, "[\228-\234\192-\255][\128-\191]+", true) do table.insert(wlist, char) end else table.insert(wlist, word) end end return wlist end -- We don't want to split on a space if it is followed by some -- specific punctuation : e.g. "word :" or "word )" -- (In french, there is a space before a colon, and it better -- not be wrapped there.) local non_splittable_space_tailers = ":;,.!?)]}$%=-+*/|<>»”" -- Same if a space has some specific other punctuation before it local non_splittable_space_leaders = "([{$=-+*/|<>«“" -- Similar rules exist for CJK text. Taken from : -- https://en.wikipedia.org/wiki/Line_breaking_rules_in_East_Asian_languages local cjk_non_splittable_tailers = table.concat( { -- Simplified Chinese "!%),.:;?]}¢°·’\"†‡›℃∶、。〃〆〕〗〞﹚﹜!"%'),.:;?!]}~", -- Traditional Chinese "!),.:;?]}¢·–—’\"•、。〆〞〕〉》」︰︱︲︳﹐﹑﹒﹓﹔﹕﹖﹘﹚﹜!),.:;?︶︸︺︼︾﹀﹂﹗]|}、", -- Japanese ")]}〕〉》」』】〙〗〟’\"⦆»ヽヾーァィゥェォッャュョヮヵヶぁぃぅぇぉっゃゅょゎゕゖㇰㇱㇲㇳㇴㇵㇶㇷㇸㇹㇺㇻㇼㇽㇾㇿ々〻‐゠–〜?!‼⁇⁈⁉・、:;,。.", -- Korean "!%),.:;?]}¢°’\"†‡℃〆〈《「『〕!%),.:;?]}", }) local cjk_non_splittable_leaders = table.concat( { -- Simplified Chinese "$(£¥·‘\"〈《「『【〔〖〝﹙﹛$(.[{£¥", -- Traditional Chinese "([{£¥‘\"‵〈《「『〔〝︴﹙﹛({︵︷︹︻︽︿﹁﹃﹏", -- Japanese "([{〔〈《「『【〘〖〝‘\"⦅«", -- Korean "$([{£¥‘\"々〇〉》」〔$([{⦆¥₩#", }) local cjk_non_splittable = table.concat( { -- Japanese "—…‥〳〴〵", }) --- Test whether a string can be separated by this char for multi-line rendering. -- Optional next or prev chars may be provided to help make the decision ---- @string c ---- @string next_c ---- @string prev_c ---- @treturn boolean true if splittable, false if not function util.isSplittable(c, next_c, prev_c) if util.isCJKChar(c) then -- a CJKChar is a word in itself, and so is splittable if cjk_non_splittable:find(c, 1, true) then -- except a few of them return false elseif next_c and cjk_non_splittable_tailers:find(next_c, 1, true) then -- but followed by a char that is not permitted at start of line return false elseif prev_c and cjk_non_splittable_leaders:find(prev_c, 1, true) then -- but preceded by a char that is not permitted at end of line return false else -- we can split on this CJKchar return true end elseif c == " " then -- we only split on a space (so punctuation sticks to prev word) -- if next_c or prev_c is provided, we can make a better decision if next_c and non_splittable_space_tailers:find(next_c, 1, true) then -- this space is followed by some punctuation that is better kept with us return false elseif prev_c and non_splittable_space_leaders:find(prev_c, 1, true) then -- this space is lead by some punctuation that is better kept with us return false else -- we can split on this space return true end end -- otherwise, non splittable return false end --- Gets filesystem type of a path. -- -- Checks if the path occurs in /proc/mounts ---- @string path an absolute path ---- @treturn string filesystem type function util.getFilesystemType(path) local mounts = io.open("/proc/mounts", "r") if not mounts then return nil end local type while true do local line local mount = {} line = mounts:read() if line == nil then break end for param in line:gmatch("%S+") do table.insert(mount, param) end if string.match(path, mount[2]) then type = mount[3] if mount[2] ~= '/' then break end end end mounts:close() return type end --- Checks if directory is empty. ---- @string path ---- @treturn bool function util.isEmptyDir(path) local lfs = require("libs/libkoreader-lfs") -- lfs.dir will crash rather than return nil if directory doesn't exist O_o local ok, iter, dir_obj = pcall(lfs.dir, path) if not ok then return end for filename in iter, dir_obj do if filename ~= '.' and filename ~= '..' then return false end end return true end --- Checks if the given path exists. Doesn't care if it's a file or directory. ---- @string path ---- @treturn bool function util.pathExists(path) local lfs = require("libs/libkoreader-lfs") return lfs.attributes(path, "mode") ~= nil end --- As `mkdir -p`. --- Unlike lfs.mkdir(), does not error if the directory already exists, and --- creates intermediate directories as needed. ---- @string path the directory to create ---- @treturn bool true on success; nil, err_message on error function util.makePath(path) path = path:gsub("/+$", "") if util.pathExists(path) then return true end local success, err = util.makePath((util.splitFilePathName(path))) if not success then return nil, err.." (creating "..path..")" end local lfs = require("libs/libkoreader-lfs") return lfs.mkdir(path) end --- Replaces characters that are invalid filenames. -- -- Replaces the characters \/:*?"<>| with an _. -- These characters are problematic on Windows filesystems. On Linux only -- / poses a problem. ---- @string str filename ---- @treturn string sanitized filename function util.replaceInvalidChars(str) if str then return str:gsub('[\\,%/,:,%*,%?,%",%<,%>,%|]','_') end end --- Replaces slash with an underscore. ---- @string str ---- @treturn string function util.replaceSlashChar(str) if str then return str:gsub('%/','_') end end --- Splits a file into its directory path and file name. --- If the given path has a trailing /, returns the entire path as the directory --- path and "" as the file name. ---- @string file ---- @treturn string path, filename function util.splitFilePathName(file) if file == nil or file == "" then return "", "" end if string.find(file, "/") == nil then return "", file end return string.gsub(file, "(.*/)(.*)", "%1"), string.gsub(file, ".*/", "") end --- Splits a file name into its pure file name and suffix ---- @string file ---- @treturn string path, extension function util.splitFileNameSuffix(file) if file == nil or file == "" then return "", "" end if string.find(file, "%.") == nil then return file, "" end return string.gsub(file, "(.*)%.(.*)", "%1"), string.gsub(file, ".*%.", "") end --- Gets file extension ---- @string filename ---- @treturn string extension function util.getFileNameSuffix(file) local _, suffix = util.splitFileNameSuffix(file) return suffix end --- Gets human friendly size as string ---- @int size (bytes) ---- @treturn string function util.getFriendlySize(size) if not size or type(size) ~= "number" then return end local s if size > 1024*1024*1024 then s = string.format("%4.1f GB", size/1024/1024/1024) elseif size > 1024*1024 then s = string.format("%4.1f MB", size/1024/1024) elseif size > 1024 then s = string.format("%4.1f KB", size/1024) else s = string.format("%d B", size) end return s end --- Gets formatted size as string (1273334 => "1,273,334") ---- @int size (bytes) ---- @treturn string function util.getFormattedSize(size) local s = tostring(size) s = s:reverse():gsub("(%d%d%d)", "%1,") s = s:reverse():gsub("^,", "") return s end --- Adds > to touch menu items with a submenu function util.getMenuText(item) local text if item.text_func then text = item.text_func() else text = item.text end if item.sub_item_table ~= nil then text = text .. " \226\150\184" end return text end --- Replaces invalid UTF-8 characters with a replacement string. -- -- Based on http://notebook.kulchenko.com/programming/fixing-malformed-utf8-in-lua ---- @string str the string to be checked for invalid characters ---- @string replacement the string to replace invalid characters with ---- @treturn string valid UTF-8 function util.fixUtf8(str, replacement) local pos = 1 local len = #str while pos <= len do if pos == str:find("[%z\1-\127]", pos) then pos = pos + 1 elseif pos == str:find("[\194-\223][\128-\191]", pos) then pos = pos + 2 elseif pos == str:find( "\224[\160-\191][\128-\191]", pos) or pos == str:find("[\225-\236][\128-\191][\128-\191]", pos) or pos == str:find( "\237[\128-\159][\128-\191]", pos) or pos == str:find("[\238-\239][\128-\191][\128-\191]", pos) then pos = pos + 3 elseif pos == str:find( "\240[\144-\191][\128-\191][\128-\191]", pos) or pos == str:find("[\241-\243][\128-\191][\128-\191][\128-\191]", pos) or pos == str:find( "\244[\128-\143][\128-\191][\128-\191]", pos) then pos = pos + 4 else str = str:sub(1, pos - 1) .. replacement .. str:sub(pos + 1) pos = pos + #replacement len = len + #replacement - 1 end end return str end --- Splits input string with the splitter into a table. This function ignores the last empty entity. -- --- @string str the string to be split --- @string splitter --- @bool capture_empty_entity --- @treturn an array-like table function util.splitToArray(str, splitter, capture_empty_entity) local result = {} for word in util.gsplit(str, splitter, false, capture_empty_entity) do table.insert(result, word) end return result end --- Convert a Unicode codepoint (number) to UTF8 char -- --- @int c Unicode codepoint --- @treturn string UTF8 char function util.unicodeCodepointToUtf8(c) if c < 128 then return string.char(c) elseif c < 2048 then return string.char(192 + c/64, 128 + c%64) elseif c < 55296 or 57343 < c and c < 65536 then return string.char(224 + c/4096, 128 + c/64%64, 128 + c%64) elseif c < 1114112 then return string.char(240 + c/262144, 128 + c/4096%64, 128 + c/64%64, 128 + c%64) else return util.unicodeCodepointToUtf8(65533) -- U+FFFD REPLACEMENT CHARACTER end end -- we need to use an array of arrays to keep them ordered as written local HTML_ENTITIES_TO_UTF8 = { {"<", "<"}, {">", ">"}, {""", '"'}, {"'", "'"}, {" ", "\xC2\xA0"}, {"&#(%d+);", function(x) return util.unicodeCodepointToUtf8(tonumber(x)) end}, {"&#x(%x+);", function(x) return util.unicodeCodepointToUtf8(tonumber(x,16)) end}, {"&", "&"}, -- must be last } --- Replace HTML entities with their UTF8 equivalent in text -- -- Supports only basic ones and those with numbers (no support -- for named entities like é) --- @int string text with HTML entities --- @treturn string UTF8 text function util.htmlEntitiesToUtf8(text) for _, t in ipairs(HTML_ENTITIES_TO_UTF8) do text = text:gsub(t[1], t[2]) end return text end --- Convert simple HTML to plain text -- This may fail on complex HTML (with styles, scripts, comments), but should -- be fine enough with simple HTML as found in EPUB's . -- --- @string text HTML text --- @treturn string plain text function util.htmlToPlainText(text) -- Replace
and

with \n text = text:gsub("%s*<%s*br%s*/?>%s*", "\n") --
and
text = text:gsub("%s*<%s*p%s*>%s*", "\n") --

text = text:gsub("%s*%s*", "\n") --

text = text:gsub("%s*<%s*p%s*/>%s*", "\n") -- standalone

-- Remove all HTML tags text = text:gsub("<[^>]*>", "") -- Convert HTML entities text = util.htmlEntitiesToUtf8(text) -- Trim spaces and new lines at start and end text = text:gsub("^[\n%s]*", "") text = text:gsub("[\n%s]*$", "") return text end --- Convert HTML to plain text if text seems to be HTML -- Detection of HTML is simple and may raise false positives -- or negatives, but seems quite good at guessing content type -- of text found in EPUB's . -- --- @string text the string with possibly some HTML --- @treturn string cleaned text function util.htmlToPlainTextIfHtml(text) local is_html = false -- Quick way to check if text is some HTML: -- look for html tags local _, nb_tags _, nb_tags = text:gsub("<%w+.->", "") if nb_tags > 0 then is_html = true else -- no found -- but we may meet some text badly twicely encoded html containing "<br>" local nb_encoded_tags _, nb_encoded_tags = text:gsub("<%a+>", "") if nb_encoded_tags > 0 then is_html = true -- decode one of the two encodes text = util.htmlEntitiesToUtf8(text) end end if is_html then text = util.htmlToPlainText(text) else -- if text ends with ]]>, it probably comes from that -- crengine has extracted correctly, but let the ending tag in, so -- let's remove it text = text:gsub("]]>%s*$", "") end return text end --- Encode the HTML entities in a string --- @string text the string to escape -- Taken from https://github.com/kernelsauce/turbo/blob/e4a35c2e3fb63f07464f8f8e17252bea3a029685/turbo/escape.lua#L58-L70 function util.htmlEscape(text) return text:gsub("[}{\">/<'&]", { ["&"] = "&", ["<"] = "<", [">"] = ">", ['"'] = """, ["'"] = "'", ["/"] = "/", }) end --- Escape list for shell usage --- @table args the list of arguments to escape --- @treturn string the escaped and concatenated arguments function util.shell_escape(args) local escaped_args = {} for _, arg in ipairs(args) do arg = "'" .. arg:gsub("'", "'\\''") .. "'" table.insert(escaped_args, arg) end return table.concat(escaped_args, " ") end --- Clear all the elements from a table without reassignment. --- @table t the table to be cleared function util.clearTable(t) local c = #t for i = 0, c do t[i] = nil end end --- Encode URL also known as percent-encoding see https://en.wikipedia.org/wiki/Percent-encoding --- @string text the string to encode --- @treturn encode string --- Taken from https://gist.github.com/liukun/f9ce7d6d14fa45fe9b924a3eed5c3d99 function util.urlEncode(url) local char_to_hex = function(c) return string.format("%%%02X", string.byte(c)) end if url == nil then return end url = url:gsub("\n", "\r\n") url = url:gsub("([^%w%-%.%_%~%!%*%'%(%)])", char_to_hex) return url end --- Decode URL (reverse process to util.urlEncode()) --- @string text the string to decode --- @treturn decode string --- Taken from https://gist.github.com/liukun/f9ce7d6d14fa45fe9b924a3eed5c3d99 function util.urlDecode(url) local hex_to_char = function(x) return string.char(tonumber(x, 16)) end if url == nil then return end url = url:gsub("%%(%x%x)", hex_to_char) return url end return util