mirror of
https://github.com/koreader/koreader
synced 2024-11-04 12:00:25 +00:00
1465 lines
51 KiB
Lua
1465 lines
51 KiB
Lua
--[[--
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This module contains miscellaneous helper functions for the KOReader frontend.
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]]
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local BaseUtil = require("ffi/util")
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local Utf8Proc = require("ffi/utf8proc")
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local lfs = require("libs/libkoreader-lfs")
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local logger = require("logger")
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local _ = require("gettext")
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local C_ = _.pgettext
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local T = BaseUtil.template
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local ffi = require("ffi")
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local C = ffi.C
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require("ffi/posix_h")
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local lshift = bit.lshift
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local rshift = bit.rshift
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local band = bit.band
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local bor = bit.bor
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local util = {}
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---- Strips all punctuation marks and spaces from a string.
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---- @string text the string to be stripped
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---- @treturn string stripped text
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function util.stripPunctuation(text)
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if not text then return end
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-- strip ASCII punctuation marks around text
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-- and strip any generic punctuation marks (U+2000 - U+206F) in the text
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return text:gsub("\226[\128-\131][\128-\191]", ''):gsub("^%p+", ''):gsub("%p+$", '')
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end
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-- Various whitespace trimming helpers, from http://lua-users.org/wiki/CommonFunctions & http://lua-users.org/wiki/StringTrim
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---- Remove leading whitespace from string.
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---- @string s the string to be trimmed
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---- @treturn string trimmed text
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function util.ltrim(s)
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return (s:gsub("^%s*", ""))
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end
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---- Remove trailing whitespace from string.
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---- @string s the string to be trimmed
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---- @treturn string trimmed text
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function util.rtrim(s)
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local n = #s
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while n > 0 and s:find("^%s", n) do
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n = n - 1
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end
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return s:sub(1, n)
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end
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---- Remove leading & trailing whitespace from string.
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---- @string s the string to be trimmed
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---- @treturn string trimmed text
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function util.trim(s)
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local from = s:match"^%s*()"
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return from > #s and "" or s:match(".*%S", from)
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end
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--[[--
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Splits a string by a pattern
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Lua doesn't have a string.split() function and most of the time
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you don't really need it because string.gmatch() is enough.
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However string.gmatch() has one significant disadvantage for me:
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You can't split a string while matching both the delimited
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strings and the delimiters themselves without tracking positions
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and substrings. The gsplit function below takes care of
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this problem.
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Author: Peter Odding
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License: MIT/X11
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Source: <a href="http://snippets.luacode.org/snippets/String_splitting_130">http://snippets.luacode.org/snippets/String_splitting_130</a>
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]]
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----@string str string to split
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----@param pattern the pattern to split against
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----@bool capture
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----@bool capture_empty_entity
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function util.gsplit(str, pattern, capture, capture_empty_entity)
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pattern = pattern and tostring(pattern) or '%s+'
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if (''):find(pattern) then
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error('pattern matches empty string!', 2)
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end
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return coroutine.wrap(function()
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local index = 1
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repeat
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local first, last = str:find(pattern, index)
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if first and last then
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if index < first or (index == first and capture_empty_entity) then
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coroutine.yield(str:sub(index, first - 1))
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end
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if capture then
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coroutine.yield(str:sub(first, last))
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end
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index = last + 1
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else
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if index <= #str then
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coroutine.yield(str:sub(index))
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end
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break
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end
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until index > #str
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end)
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end
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--[[--
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Compares values in two different tables.
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Source: <https://stackoverflow.com/a/32660766/2470572>
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]]
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---- @param o1 Lua table
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---- @param o2 Lua table
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---- @bool ignore_mt
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---- @treturn boolean
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function util.tableEquals(o1, o2, ignore_mt)
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if o1 == o2 then return true end
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local o1Type = type(o1)
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local o2Type = type(o2)
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if o1Type ~= o2Type then return false end
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if o1Type ~= 'table' then return false end
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if not ignore_mt then
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local mt1 = getmetatable(o1)
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if mt1 and mt1.__eq then
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-- Compare using built in method
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return o1 == o2
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end
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end
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local keySet = {}
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for key1, value1 in pairs(o1) do
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local value2 = o2[key1]
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if value2 == nil or util.tableEquals(value1, value2, ignore_mt) == false then
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return false
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end
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keySet[key1] = true
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end
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for key2, _ in pairs(o2) do
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if not keySet[key2] then return false end
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end
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return true
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end
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--[[--
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Makes a deep copy of a table.
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Source: <https://stackoverflow.com/a/16077650/2470572>
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]]
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---- @param o Lua table
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---- @treturn Lua table
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function util.tableDeepCopy(o, seen)
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seen = seen or {}
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if o == nil then return nil end
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if seen[o] then return seen[o] end
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local no
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if type(o) == "table" then
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no = {}
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seen[o] = no
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for k, v in next, o, nil do
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no[util.tableDeepCopy(k, seen)] = util.tableDeepCopy(v, seen)
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end
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setmetatable(no, util.tableDeepCopy(getmetatable(o), seen))
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else -- number, string, boolean, etc
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no = o
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end
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return no
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end
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--- Returns number of keys in a table.
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---- @param t Lua table
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---- @treturn int number of keys in table t
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function util.tableSize(t)
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local count = 0
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for _ in pairs(t) do count = count + 1 end
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return count
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end
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--- Append all elements from t2 into t1.
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---- @param t1 Lua table
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---- @param t2 Lua table
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function util.arrayAppend(t1, t2)
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for _, v in ipairs(t2) do
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table.insert(t1, v)
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end
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end
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--[[--
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Remove elements from an array, fast.
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Swap & pop, like <http://lua-users.org/lists/lua-l/2013-11/msg00027.html> / <https://stackoverflow.com/a/28942022>, but preserving order.
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c.f., <https://stackoverflow.com/a/53038524>
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@table t Lua array to filter
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@func keep_cb Filtering callback. Takes three arguments: table, index, new index. Returns true to *keep* the item. See link above for potential uses of the third argument.
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@usage
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local foo = { "a", "b", "c", "b", "d", "e" }
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local function drop_b(t, i, j)
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-- Discard any item with value "b"
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return t[i] ~= "b"
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end
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util.arrayRemove(foo, drop_b)
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]]
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function util.arrayRemove(t, keep_cb)
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local j, n = 1, #t
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for i = 1, n do
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if keep_cb(t, i, j) then
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-- Move i's kept value to j's position, if it's not already there.
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if i ~= j then
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t[j] = t[i]
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t[i] = nil
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end
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-- Increment position of where we'll place the next kept value.
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j = j + 1
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else
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t[i] = nil
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end
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end
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return t
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end
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--- Reverse array elements in-place in table t
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---- @param t Lua table
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function util.arrayReverse(t)
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local i, j = 1, #t
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while i < j do
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t[i], t[j] = t[j], t[i]
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i = i + 1
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j = j - 1
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end
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end
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--- Test whether t contains a value equal to v
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--- (or such a value that callback returns true),
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--- and if so, return the index.
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---- @param t Lua table
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---- @param v
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---- @func callback(v1, v2)
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function util.arrayContains(t, v, cb)
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cb = cb or function(v1, v2) return v1 == v2 end
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for _k, _v in ipairs(t) do
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if cb(_v, v) then
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return _k
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end
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end
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return false
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end
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--- Test whether array t contains a reference to array n (at any depth at or below m)
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---- @param t Lua table (array only)
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---- @param n Lua table (array only)
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---- @int m Max nesting level
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function util.arrayReferences(t, n, m, l)
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if not m then m = 15 end
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if not l then l = 0 end
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if l > m then
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return false
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end
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if type(t) == "table" then
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if t == n then
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return true, l
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end
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for _, v in ipairs(t) do
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local matched, depth = util.arrayReferences(v, n, m, l + 1)
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if matched then
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return matched, depth
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end
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end
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end
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return false
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end
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-- A set of binary search implementations for plain arrays.
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-- Should be easy to tweak for arrays of hashes (c.f., UIManager:schedule),
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-- or arrays sorted in descending order (c.f., ReadHistory).
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-- refs: https://en.wikipedia.org/wiki/Binary_search_algorithm
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-- https://rosettacode.org/wiki/Binary_search
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--- Perform a binary search for `value` in a *sorted* (ascending) `array`.
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---- @param array Lua table (array only, sorted, ascending, every value must match the type of `value` and support comparison operators)
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---- @param value
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---- @return int index of value in array, or a (nil, insertion index) tuple if value was not found.
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function util.bsearch(array, value)
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local lo = 1
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local hi = #array
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while lo <= hi do
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-- invariants: value > array[i] for all i < lo
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-- value < array[i] for all i > hi
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local mid = bit.rshift(lo + hi, 1)
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if array[mid] > value then
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hi = mid - 1
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elseif array[mid] < value then
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lo = mid + 1
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else
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return mid
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end
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end
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return nil, lo
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end
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--- Perform a leftmost insertion binary search for `value` in a *sorted* (ascending) `array`.
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---- @param array Lua table (array only, sorted, ascending, every value must match the type of `value` and support comparison operators)
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---- @param value
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---- @return int leftmost insertion index of value in array.
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function util.bsearch_left(array, value)
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local lo = 1
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local hi = #array
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while lo <= hi do
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-- invariants: value > array[i] for all i < lo
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-- value <= array[i] for all i > hi
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local mid = bit.rshift(lo + hi, 1)
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if array[mid] >= value then
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hi = mid - 1
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else
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lo = mid + 1
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end
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end
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return lo
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end
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--- Perform a rightmost insertion binary search for `value` in a *sorted* (ascending) `array`.
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---- @param array Lua table (array only, sorted, ascending, every value must match the type of `value` and support comparison operators)
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---- @param value
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---- @return int rightmost insertion index of value in array.
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function util.bsearch_right(array, value)
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local lo = 1
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local hi = #array
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while lo <= hi do
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-- invariants: value >= array[i] for all i < low
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-- value < array[i] for all i > high
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local mid = bit.rshift(lo + hi, 1)
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if array[mid] > value then
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hi = mid - 1
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else
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lo = mid + 1
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end
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end
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return lo
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end
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-- Merge t2 into t1, overwriting existing elements if they already exist
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-- Probably not safe with nested tables (c.f., https://stackoverflow.com/q/1283388)
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---- @param t1 Lua table
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---- @param t2 Lua table
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function util.tableMerge(t1, t2)
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for k, v in pairs(t2) do
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t1[k] = v
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end
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end
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--[[--
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Gets last index of character in string (i.e., strrchr)
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Returns the index within this string of the last occurrence of the specified character
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or -1 if the character does not occur.
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To find . you need to escape it.
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]]
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---- @string string
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---- @string ch
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---- @treturn int last occurrence or -1 if not found
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function util.lastIndexOf(string, ch)
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local i = string:match(".*" .. ch .. "()")
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if i == nil then return -1 else return i - 1 end
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end
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--- Pattern which matches a single well-formed UTF-8 character, including
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--- theoretical >4-byte extensions.
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-- Taken from <https://www.lua.org/manual/5.4/manual.html#pdf-utf8.charpattern>
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util.UTF8_CHAR_PATTERN = '[%z\1-\127\194-\253][\128-\191]*'
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--- Reverse the individual greater-than-single-byte characters
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-- @string string to reverse
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-- Taken from <https://github.com/blitmap/lua-utf8-simple#utf8reverses>
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function util.utf8Reverse(text)
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text = text:gsub(util.UTF8_CHAR_PATTERN, function (c) return #c > 1 and c:reverse() end)
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return text:reverse()
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end
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--- Splits string into a list of UTF-8 characters.
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---- @string text the string to be split.
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---- @treturn table list of UTF-8 chars
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function util.splitToChars(text)
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local tab = {}
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if text ~= nil then
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local prevcharcode, charcode = 0
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-- Supports WTF-8 : https://en.wikipedia.org/wiki/UTF-8#WTF-8
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-- a superset of UTF-8, that includes UTF-16 surrogates
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-- in UTF-8 bytes (forbidden in well-formed UTF-8).
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-- We may get that from bad producers or converters.
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-- (luajson, used to decode Wikipedia API json, will not correctly decode
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-- this sample: <span lang=\"got\">\ud800\udf45</span> : single Unicode
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-- char https://www.compart.com/en/unicode/U+10345 and will give us
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-- "\xed\xa0\x80\xed\xbd\x85" as UTF8, instead of the correct "\xf0\x90\x8d\x85")
|
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-- From http://www.unicode.org/faq/utf_bom.html#utf16-1
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-- Surrogates are code points from two special ranges of
|
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-- Unicode values, reserved for use as the leading, and
|
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-- trailing values of paired code units in UTF-16. Leading,
|
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-- also called high, surrogates are from D800 to DBFF, and
|
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-- trailing, or low, surrogates are from DC00 to DFFF. They
|
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-- are called surrogates, since they do not represent
|
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-- characters directly, but only as a pair.
|
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local hi_surrogate
|
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local hi_surrogate_uchar
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for uchar in text:gmatch(util.UTF8_CHAR_PATTERN) do
|
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charcode = BaseUtil.utf8charcode(uchar)
|
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-- (not sure why we need this prevcharcode check; we could get
|
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-- charcode=nil with invalid UTF-8, but should we then really
|
||
-- ignore the following charcode ?)
|
||
if prevcharcode then -- utf8
|
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if charcode and charcode >= 0xD800 and charcode <= 0xDBFF then
|
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if hi_surrogate then -- previous unconsumed one, add it even if invalid
|
||
table.insert(tab, hi_surrogate_uchar)
|
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end
|
||
hi_surrogate = charcode
|
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hi_surrogate_uchar = uchar -- will be added if not followed by low surrogate
|
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elseif hi_surrogate and charcode and charcode >= 0xDC00 and charcode <= 0xDFFF then
|
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-- low surrogate following a high surrogate, good, let's make them a single char
|
||
charcode = lshift((hi_surrogate - 0xD800), 10) + (charcode - 0xDC00) + 0x10000
|
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table.insert(tab, util.unicodeCodepointToUtf8(charcode))
|
||
hi_surrogate = nil
|
||
else
|
||
if hi_surrogate then -- previous unconsumed one, add it even if invalid
|
||
table.insert(tab, hi_surrogate_uchar)
|
||
end
|
||
hi_surrogate = nil
|
||
table.insert(tab, uchar)
|
||
end
|
||
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)
|
||
-- Smallest CJK codepoint is 0x1100 which requires at least 3 utf8 bytes to
|
||
-- encode (U+07FF is the largest codepoint that can be represented in 2
|
||
-- bytes with utf8). So if the character is shorter than 3 bytes it's
|
||
-- definitely not CJK and no need to decode it.
|
||
if #c < 3 then
|
||
return false
|
||
end
|
||
local code = BaseUtil.utf8charcode(c)
|
||
-- The weird bracketing is intentional -- we use the lowest possible
|
||
-- codepoint as a shortcut so if the codepoint is below U+1100 we
|
||
-- immediately return false.
|
||
return -- BMP (Plane 0)
|
||
code >= 0x1100 and (code <= 0x11FF or -- Hangul Jamo
|
||
(code >= 0x2E80 and code <= 0x9FFF) or -- Numerous CJK Blocks (NB: has some gaps)
|
||
(code >= 0xA960 and code <= 0xA97F) or -- Hangul Jamo Extended-A
|
||
(code >= 0xAC00 and code <= 0xD7AF) or -- Hangul Syllables
|
||
(code >= 0xD7B0 and code <= 0xD7FF) or -- Hangul Jame Extended-B
|
||
(code >= 0xF900 and code <= 0xFAFF) or -- CJK Compatibility Ideographs
|
||
(code >= 0xFE30 and code <= 0xFE4F) or -- CJK Compatibility Forms
|
||
(code >= 0xFF00 and code <= 0xFFEF) or -- Halfwidth and Fullwidth Forms
|
||
-- SIP (Plane 2)
|
||
(code >= 0x20000 and code <= 0x2A6DF) or -- CJK Unified Ideographs Extension B
|
||
(code >= 0x2A700 and code <= 0x2B73F) or -- CJK Unified Ideographs Extension C
|
||
(code >= 0x2B740 and code <= 0x2B81F) or -- CJK Unified Ideographs Extension D
|
||
(code >= 0x2B820 and code <= 0x2CEAF) or -- CJK Unified Ideographs Extension E
|
||
(code >= 0x2CEB0 and code <= 0x2EBEF) or -- CJK Unified Ideographs Extension F
|
||
(code >= 0x2F800 and code <= 0x2FA1F) or -- CJK Compatibility Ideographs Supplement
|
||
-- TIP (Plane 3)
|
||
(code >= 0x30000 and code <= 0x3134F)) -- CJK Unified Ideographs Extension G
|
||
end
|
||
|
||
--- Tests whether str contains CJK characters
|
||
---- @string str
|
||
---- @treturn boolean true if CJK
|
||
function util.hasCJKChar(str)
|
||
for c in str:gmatch(util.UTF8_CHAR_PATTERN) do
|
||
if util.isCJKChar(c) then
|
||
return true
|
||
end
|
||
end
|
||
return false
|
||
end
|
||
|
||
--- Split texts into a list of words, spaces and punctuation marks.
|
||
---- @string text text to split
|
||
---- @treturn table list of words, spaces and punctuation marks
|
||
function util.splitToWords(text)
|
||
local wlist = {}
|
||
for word in util.gsplit(text, "[%s%p]+", true) do
|
||
-- if space split word contains CJK characters
|
||
if util.hasCJKChar(word) then
|
||
-- split all non-ASCII characters separately (FIXME ideally we
|
||
-- would split only the CJK characters, but you cannot define CJK
|
||
-- characters trivially with a byte-only Lua pattern).
|
||
for char in util.gsplit(word, "[\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 marks : e.g. "word :" or "word )"
|
||
-- (In French, there is a non-breaking 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 mark 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 a punctuation mark 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 mark 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 mark that is better kept with us
|
||
return false
|
||
else
|
||
-- we can split on this space
|
||
return true
|
||
end
|
||
end
|
||
-- otherwise, not splittable
|
||
return false
|
||
end
|
||
|
||
--- Gets filesystem type of a path.
|
||
--
|
||
-- Checks if the path occurs in <code>/proc/mounts</code>
|
||
---- @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
|
||
for line in mounts:lines() do
|
||
local mount = {}
|
||
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
|
||
|
||
-- For documentation purposes, here's a battle-tested shell version of calcFreeMem,
|
||
-- our simplified Lua version follows...
|
||
--[[
|
||
if grep -q 'MemAvailable' /proc/meminfo ; then
|
||
# We'll settle for 85% of available memory to leave a bit of breathing room
|
||
tmpfs_size="$(awk '/MemAvailable/ {printf "%d", $2 * 0.85}' /proc/meminfo)"
|
||
elif grep -q 'Inactive(file)' /proc/meminfo ; then
|
||
# Basically try to emulate the kernel's computation, c.f., https://unix.stackexchange.com/q/261247
|
||
# Again, 85% of available memory
|
||
tmpfs_size="$(awk -v low=$(grep low /proc/zoneinfo | awk '{k+=$2}END{printf "%d", k}') \
|
||
'{a[$1]=$2}
|
||
END{
|
||
printf "%d", (a["MemFree:"]+a["Active(file):"]+a["Inactive(file):"]+a["SReclaimable:"]-(12*low))*0.85;
|
||
}' /proc/meminfo)"
|
||
else
|
||
# Ye olde crap workaround of Free + Buffers + Cache...
|
||
# Take it with a grain of salt, and settle for 80% of that...
|
||
tmpfs_size="$(awk \
|
||
'{a[$1]=$2}
|
||
END{
|
||
printf "%d", (a["MemFree:"]+a["Buffers:"]+a["Cached:"])*0.80;
|
||
}' /proc/meminfo)"
|
||
fi
|
||
--]]
|
||
|
||
--- Computes the currently available memory
|
||
---- @treturn tuple of ints: memavailable, memtotal (or nil, nil on unsupported platforms).
|
||
function util:calcFreeMem()
|
||
local memtotal, memfree, memavailable, buffers, cached
|
||
|
||
local meminfo = io.open("/proc/meminfo", "r")
|
||
if meminfo then
|
||
for line in meminfo:lines() do
|
||
if not memtotal then
|
||
memtotal = line:match("^MemTotal:%s-(%d+) kB")
|
||
if memtotal then
|
||
-- Next!
|
||
goto continue
|
||
end
|
||
end
|
||
|
||
if not memfree then
|
||
memfree = line:match("^MemFree:%s-(%d+) kB")
|
||
if memfree then
|
||
-- Next!
|
||
goto continue
|
||
end
|
||
end
|
||
|
||
if not memavailable then
|
||
memavailable = line:match("^MemAvailable:%s-(%d+) kB")
|
||
if memavailable then
|
||
-- Best case scenario, we're done :)
|
||
break
|
||
end
|
||
end
|
||
|
||
if not buffers then
|
||
buffers = line:match("^Buffers:%s-(%d+) kB")
|
||
if buffers then
|
||
-- Next!
|
||
goto continue
|
||
end
|
||
end
|
||
|
||
if not cached then
|
||
cached = line:match("^Cached:%s-(%d+) kB")
|
||
if cached then
|
||
-- Ought to be the last entry we care about, we're done
|
||
break
|
||
end
|
||
end
|
||
|
||
::continue::
|
||
end
|
||
meminfo:close()
|
||
else
|
||
-- Not on Linux?
|
||
return nil, nil
|
||
end
|
||
|
||
if memavailable then
|
||
-- Leave a bit of margin, and report 85% of that...
|
||
return math.floor(memavailable * 0.85) * 1024, memtotal * 1024
|
||
else
|
||
-- Crappy Free + Buffers + Cache version, because the zoneinfo approach is a tad hairy...
|
||
-- So, leave an even larger margin, and only report 75% of that...
|
||
return math.floor((memfree + buffers + cached) * 0.75) * 1024, memtotal * 1024
|
||
end
|
||
end
|
||
|
||
--- Recursively scan directory for files inside
|
||
-- @string path
|
||
-- @func callback(fullpath, name, attr)
|
||
function util.findFiles(dir, cb)
|
||
local function scan(current)
|
||
local ok, iter, dir_obj = pcall(lfs.dir, current)
|
||
if not ok then return end
|
||
for f in iter, dir_obj do
|
||
local path = current.."/"..f
|
||
-- lfs can return nil here, as it will follow symlinks!
|
||
local attr = lfs.attributes(path) or {}
|
||
if attr.mode == "directory" then
|
||
if f ~= "." and f ~= ".." then
|
||
scan(path)
|
||
end
|
||
elseif attr.mode == "file" or attr.mode == "link" then
|
||
cb(path, f, attr)
|
||
end
|
||
end
|
||
end
|
||
scan(dir)
|
||
end
|
||
|
||
--- Checks if directory is empty.
|
||
---- @string path
|
||
---- @treturn bool
|
||
function util.isEmptyDir(path)
|
||
-- 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
|
||
|
||
--- check if the given path is a file
|
||
---- @string path
|
||
---- @treturn bool
|
||
function util.fileExists(path)
|
||
local file = io.open(path, "r")
|
||
if file ~= nil then
|
||
file:close()
|
||
return true
|
||
end
|
||
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)
|
||
return lfs.attributes(path, "mode") ~= nil
|
||
end
|
||
|
||
--- As `mkdir -p`.
|
||
-- Unlike [lfs.mkdir](https://keplerproject.github.io/luafilesystem/manual.html#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)
|
||
if lfs.attributes(path, "mode") == "directory" then
|
||
return true
|
||
end
|
||
|
||
local components
|
||
if path:sub(1, 1) == "/" then
|
||
-- Leading slash, remember that it's an absolute path
|
||
components = "/"
|
||
else
|
||
-- Relative path
|
||
components = ""
|
||
end
|
||
|
||
local success, err
|
||
-- NOTE: mkdir -p handles umask shenanigans for intermediate components, we don't
|
||
for component in path:gmatch("([^/]+)") do
|
||
-- The trailing slash ensures we properly fail via mkdir if the composite path already exists as a file/link
|
||
components = components .. component .. "/"
|
||
if lfs.attributes(components, "mode") == nil then
|
||
success, err = lfs.mkdir(components)
|
||
if not success then
|
||
return nil, err .. " (creating `" .. components .. "` for `" .. path .. "`)"
|
||
end
|
||
end
|
||
end
|
||
|
||
return success, err
|
||
end
|
||
|
||
--- Remove as many of the empty directories specified in path, children-first.
|
||
-- Does not fail if the directory is already gone.
|
||
-- @string path the directory tree to prune
|
||
-- @treturn bool true on success; nil, err_message on error
|
||
function util.removePath(path)
|
||
local component = path
|
||
repeat
|
||
local attr = lfs.attributes(component, "mode")
|
||
if attr == "directory" then
|
||
local success, err = lfs.rmdir(component)
|
||
if not success then
|
||
-- Most likely because ENOTEMPTY ;)
|
||
return nil, err .. " (removing `" .. component .. "` for `" .. path .. "`)"
|
||
end
|
||
elseif attr ~= nil then
|
||
return nil, "Encountered a component that isn't a directory" .. " (removing `" .. component .. "` for `" .. path .. "`)"
|
||
end
|
||
|
||
local parent = BaseUtil.dirname(component)
|
||
component = parent
|
||
until parent == "." or parent == "/"
|
||
return true, nil
|
||
end
|
||
|
||
--- As `rm`
|
||
-- @string path of the file to remove
|
||
-- @treturn bool true on success; nil, err_message on error
|
||
function util.removeFile(file)
|
||
if file and lfs.attributes(file, "mode") == "file" then
|
||
return os.remove(file)
|
||
elseif file then
|
||
return nil, file .. " is not a file"
|
||
else
|
||
return nil, "file is nil"
|
||
end
|
||
end
|
||
|
||
function util.writeToSysfs(val, file)
|
||
-- NOTE: We do things by hand via ffi, because io.write uses fwrite,
|
||
-- which isn't a great fit for procfs/sysfs (e.g., we lose failure cases like EBUSY,
|
||
-- as it only reports failures to write to the *stream*, not to the disk/file!).
|
||
local fd = C.open(file, bit.bor(C.O_WRONLY, C.O_CLOEXEC)) -- procfs/sysfs, we shouldn't need O_TRUNC
|
||
if fd == -1 then
|
||
logger.err("Cannot open file `" .. file .. "`:", ffi.string(C.strerror(ffi.errno())))
|
||
return
|
||
end
|
||
val = tostring(val)
|
||
local bytes = #val
|
||
local nw = C.write(fd, val, bytes)
|
||
if nw == -1 then
|
||
logger.err("Cannot write `" .. val .. "` to file `" .. file .. "`:", ffi.string(C.strerror(ffi.errno())))
|
||
end
|
||
C.close(fd)
|
||
-- NOTE: Allows the caller to possibly handle short writes (not that these should ever happen here).
|
||
return nw == bytes
|
||
end
|
||
|
||
-- Gets total, used and available bytes for the mountpoint that holds a given directory.
|
||
-- @string path of the directory
|
||
-- @treturn table with total, used and available bytes
|
||
function util.diskUsage(dir)
|
||
-- safe way of testing df & awk
|
||
local function doCommand(d)
|
||
local handle = io.popen("df -k " .. d .. " 2>/dev/null | awk '$3 ~ /[0-9]+/ { print $2,$3,$4 }' 2>/dev/null || echo ::ERROR::")
|
||
if not handle then return end
|
||
local output = handle:read("*all")
|
||
handle:close()
|
||
if not output:find "::ERROR::" then
|
||
return output
|
||
end
|
||
end
|
||
local err = { total = nil, used = nil, available = nil }
|
||
if not dir or lfs.attributes(dir, "mode") ~= "directory" then return err end
|
||
local usage = doCommand(dir)
|
||
if not usage then return err end
|
||
local stage, result = {}, {}
|
||
for size in usage:gmatch("%w+") do
|
||
table.insert(stage, size)
|
||
end
|
||
for k, v in pairs({"total", "used", "available"}) do
|
||
if stage[k] ~= nil then
|
||
-- sizes are in kb, return bytes here
|
||
result[v] = stage[k] * 1024
|
||
end
|
||
end
|
||
return result
|
||
end
|
||
|
||
|
||
--- Replaces characters that are invalid filenames.
|
||
--
|
||
-- Replaces the characters <code>\/:*?"<>|</code> with an <code>_</code>.
|
||
-- These characters are problematic on Windows filesystems. On Linux only
|
||
-- <code>/</code> poses a problem.
|
||
---- @string str filename
|
||
---- @treturn string sanitized filename
|
||
local function replaceAllInvalidChars(str)
|
||
if str then
|
||
return str:gsub('[\\,%/,:,%*,%?,%",%<,%>,%|]','_')
|
||
end
|
||
end
|
||
|
||
--- Replaces slash with an underscore.
|
||
---- @string str
|
||
---- @treturn string
|
||
local function replaceSlashChar(str)
|
||
if str then
|
||
return str:gsub('%/','_')
|
||
end
|
||
end
|
||
|
||
--[[--
|
||
Replaces characters that are invalid in filenames.
|
||
|
||
Replaces the characters `\/:*?"<>|` with an `_` unless an optional path is provided. These characters are problematic on Windows filesystems. On Linux only the `/` poses a problem.
|
||
|
||
If an optional path is provided, @{util.getFilesystemType}() will be used to determine whether stricter VFAT restrictions should be applied.
|
||
]]
|
||
---- @string str
|
||
---- @string path
|
||
---- @int limit
|
||
---- @treturn string safe filename
|
||
function util.getSafeFilename(str, path, limit, limit_ext)
|
||
local filename, suffix = util.splitFileNameSuffix(str)
|
||
local replaceFunc = replaceAllInvalidChars
|
||
local safe_filename
|
||
-- VFAT supports a maximum of 255 UCS-2 characters, although it's probably treated as UTF-16 by Windows
|
||
-- default to a slightly lower limit just in case
|
||
limit = limit or 240
|
||
limit_ext = limit_ext or 10
|
||
|
||
-- Always assume the worst on Android (#7837)
|
||
if path and not BaseUtil.isAndroid() then
|
||
local file_system = util.getFilesystemType(path)
|
||
if file_system ~= "vfat" and file_system ~= "fuse.fsp" then
|
||
replaceFunc = replaceSlashChar
|
||
end
|
||
end
|
||
|
||
if suffix:len() > limit_ext then
|
||
-- probably not an actual file extension, or at least not one we'd be
|
||
-- dealing with, so strip the whole string
|
||
filename = str
|
||
suffix = nil
|
||
end
|
||
|
||
filename = util.htmlToPlainTextIfHtml(filename)
|
||
filename = filename:sub(1, limit)
|
||
-- the limit might result in broken UTF-8, which we don't want in the result
|
||
filename = util.fixUtf8(filename, "")
|
||
|
||
if suffix and suffix ~= "" then
|
||
safe_filename = replaceFunc(filename) .. "." .. replaceFunc(suffix)
|
||
else
|
||
safe_filename = replaceFunc(filename)
|
||
end
|
||
|
||
return safe_filename
|
||
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 directory, filename
|
||
function util.splitFilePathName(file)
|
||
if file == nil or file == "" then return "", "" end
|
||
if string.find(file, "/") == nil then return "", file end
|
||
return file:match("(.*/)(.*)")
|
||
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 file:match("(.*)%.(.*)")
|
||
end
|
||
|
||
--- Gets file extension
|
||
---- @string filename
|
||
---- @treturn string extension
|
||
function util.getFileNameSuffix(file)
|
||
local _, suffix = util.splitFileNameSuffix(file)
|
||
return suffix
|
||
end
|
||
|
||
--- Companion helper function that returns the script's language,
|
||
--- based on the file extension.
|
||
---- @string filename
|
||
---- @treturn string (lowercase) (or nil if not Device:canExecuteScript(file))
|
||
function util.getScriptType(file)
|
||
local file_ext = string.lower(util.getFileNameSuffix(file))
|
||
if file_ext == "sh" then
|
||
return "shell"
|
||
elseif file_ext == "py" then
|
||
return "python"
|
||
end
|
||
end
|
||
|
||
--- Gets human friendly size as string
|
||
---- @int size (bytes)
|
||
---- @bool right_align (by padding with spaces on the left)
|
||
---- @treturn string
|
||
function util.getFriendlySize(size, right_align)
|
||
local frac_format = right_align and "%6.1f" or "%.1f"
|
||
local deci_format = right_align and "%6d" or "%d"
|
||
size = tonumber(size)
|
||
if not size or type(size) ~= "number" then return end
|
||
if size > 1000*1000*1000 then
|
||
return T(C_("Data storage size", "%1 GB"), string.format(frac_format, size/1000/1000/1000))
|
||
end
|
||
if size > 1000*1000 then
|
||
return T(C_("Data storage size", "%1 MB"), string.format(frac_format, size/1000/1000))
|
||
end
|
||
if size > 1000 then
|
||
return T(C_("Data storage size", "%1 kB"), string.format(frac_format, size/1000))
|
||
else
|
||
return T(C_("Data storage size", "%1 B"), string.format(deci_format, size))
|
||
end
|
||
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
|
||
|
||
--[[--
|
||
Replaces invalid UTF-8 characters with a replacement string.
|
||
|
||
Based on <http://notebook.kulchenko.com/programming/fixing-malformed-utf8-in-lua>.
|
||
c.f., FixUTF8 @ <https://github.com/pkulchenko/ZeroBraneStudio/blob/master/src/util.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 str:find("^[%z\1-\127]", pos) then pos = pos + 1
|
||
elseif str:find("^[\194-\223][\128-\191]", pos) then pos = pos + 2
|
||
elseif str:find( "^\224[\160-\191][\128-\191]", pos)
|
||
or str:find("^[\225-\236][\128-\191][\128-\191]", pos)
|
||
or str:find( "^\237[\128-\159][\128-\191]", pos)
|
||
or str:find("^[\238-\239][\128-\191][\128-\191]", pos) then pos = pos + 3
|
||
elseif str:find( "^\240[\144-\191][\128-\191][\128-\191]", pos)
|
||
or str:find("^[\241-\243][\128-\191][\128-\191][\128-\191]", pos)
|
||
or 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 UTF-8 char
|
||
--- c.f., <https://stackoverflow.com/a/4609989>
|
||
--- & <https://stackoverflow.com/a/38492214>
|
||
--- See utf8charcode in ffi/util for a decoder.
|
||
--
|
||
--- @int c Unicode codepoint
|
||
--- @treturn string UTF-8 char
|
||
function util.unicodeCodepointToUtf8(c)
|
||
if c < 0x80 then
|
||
return string.char(c)
|
||
elseif c < 0x800 then
|
||
return string.char(
|
||
bor(0xC0, rshift(c, 6)),
|
||
bor(0x80, band(c, 0x3F))
|
||
)
|
||
elseif c < 0x10000 then
|
||
if c >= 0xD800 and c <= 0xDFFF then
|
||
return '<EFBFBD>' -- Surrogates -> U+FFFD REPLACEMENT CHARACTER
|
||
end
|
||
return string.char(
|
||
bor(0xE0, rshift(c, 12)),
|
||
bor(0x80, band(rshift(c, 6), 0x3F)),
|
||
bor(0x80, band(c, 0x3F))
|
||
)
|
||
elseif c < 0x110000 then
|
||
return string.char(
|
||
bor(0xF0, rshift(c, 18)),
|
||
bor(0x80, band(rshift(c, 12), 0x3F)),
|
||
bor(0x80, band(rshift(c, 6), 0x3F)),
|
||
bor(0x80, band(c, 0x3F))
|
||
)
|
||
else
|
||
return '<EFBFBD>' -- Invalid -> 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 UTF-8 encoded 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 UTF-8 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 `<dc:description>`.
|
||
|
||
@string text HTML text
|
||
@treturn string plain text
|
||
]]
|
||
function util.htmlToPlainText(text)
|
||
-- Replace <br> with \n
|
||
text = text:gsub("%s*<%s*br%s*/?>%s*", "\n") -- <br> and <br/>
|
||
-- Replace <p> with \n\t (\t, unlike any combination of spaces,
|
||
-- ensures a constant indentation when text is justified.)
|
||
text = text:gsub("%s*</%s*p%s*>%s*", "\n") -- </p>
|
||
text = text:gsub("%s*<%s*p%s*/>%s*", "\n") -- standalone <p/>
|
||
text = text:gsub("%s*<%s*p%s*>%s*", "\n\t") -- <p>
|
||
-- (this one last, so \t is not removed by the others' %s)
|
||
-- Remove all HTML tags
|
||
text = text:gsub("<[^>]*>", "")
|
||
-- Convert HTML entities
|
||
text = util.htmlEntitiesToUtf8(text)
|
||
-- Trim spaces and new lines at start and end, including
|
||
-- the \t we added (this looks fine enough with multiple
|
||
-- paragraphs, but feels nicer with a single paragraph,
|
||
-- whether it contains <br>s or not).
|
||
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 <dc:description>.
|
||
--
|
||
--- @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 <tag> found
|
||
-- but we may meet some text badly/twice 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 <![CDATA[ .. ]]> 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
|
||
|
||
--- Prettify a CSS stylesheet
|
||
-- Not perfect, but enough to make some ugly CSS readable.
|
||
-- By default, each selector and each property is put on its own line.
|
||
-- With condensed=true, condense each full declaration on a single line.
|
||
--
|
||
--- @string CSS string
|
||
--- @boolean condensed[opt=false] true to condense each declaration on a line
|
||
--- @treturn string the CSS prettified
|
||
function util.prettifyCSS(css_text, condensed)
|
||
if not condensed then
|
||
-- Get rid of \t so we can use it as a replacement/hiding char
|
||
css_text = css_text:gsub("\t", " ")
|
||
-- Wrap and indent declarations
|
||
css_text = css_text:gsub("%s*{%s*", " {\n ")
|
||
css_text = css_text:gsub(";%s*}%s*", ";\n}\n")
|
||
css_text = css_text:gsub(";%s*([^}])", ";\n %1")
|
||
css_text = css_text:gsub("%s*}%s*", "\n}\n")
|
||
-- Cleanup declarations
|
||
css_text = css_text:gsub("{[^}]*}", function(s)
|
||
s = s:gsub("%s*:%s*", ": ")
|
||
-- Temporarily hide/replace ',' in declaration so they
|
||
-- are not matched and made multi-lines by followup gsub
|
||
s = s:gsub("%s*,%s*", "\t")
|
||
return s
|
||
end)
|
||
-- Have each selector (separated by ',') on a new line
|
||
css_text = css_text:gsub("%s*,%s*", " ,\n")
|
||
-- Restore hidden ',' in declarations
|
||
css_text = css_text:gsub("\t", ", ")
|
||
else
|
||
-- Go thru previous method to have something standard to work on
|
||
css_text = util.prettifyCSS(css_text)
|
||
-- And condense that
|
||
css_text = css_text:gsub(" {\n ", " { ")
|
||
css_text = css_text:gsub(";\n ", "; ")
|
||
css_text = css_text:gsub("\n}", " }")
|
||
css_text = css_text:gsub(" ,\n", ", ")
|
||
end
|
||
return css_text
|
||
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 an array without reassignment.
|
||
--- @table t the array 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
|
||
|
||
--- Check lua syntax of string
|
||
--- @string text lua code text
|
||
--- @treturn string with parsing error, nil if syntax ok
|
||
function util.checkLuaSyntax(lua_text)
|
||
local lua_code_ok, err = loadstring(lua_text)
|
||
if lua_code_ok then
|
||
return nil
|
||
end
|
||
-- Replace: [string "blah blah..."]:3: '=' expected near '123'
|
||
-- with: Line 3: '=' expected near '123'
|
||
err = err and err:gsub("%[string \".-%\"]:", "Line ")
|
||
return err
|
||
end
|
||
|
||
--- Simple startsWith string helper.
|
||
--
|
||
-- C.f., <http://lua-users.org/wiki/StringRecipes>.
|
||
-- @string str source string
|
||
-- @string start string to match
|
||
-- @treturn bool true on success
|
||
function util.stringStartsWith(str, start)
|
||
return str:sub(1, #start) == start
|
||
end
|
||
|
||
--- Simple endsWith string helper.
|
||
-- @string str source string
|
||
-- @string ending string to match
|
||
-- @treturn bool true on success
|
||
function util.stringEndsWith(str, ending)
|
||
return ending == "" or str:sub(-#ending) == ending
|
||
end
|
||
|
||
--- Search a string in a text.
|
||
-- @string or table txt Text (char list) to search in
|
||
-- @string str String to search for
|
||
-- @boolean case_sensitive
|
||
-- @number start_pos Position number in text to start search from
|
||
-- @treturn number Position number or 0 if not found
|
||
function util.stringSearch(txt, str, case_sensitive, start_pos)
|
||
if not case_sensitive then
|
||
str = Utf8Proc.lowercase(util.fixUtf8(str, "?"))
|
||
end
|
||
local txt_charlist = type(txt) == "table" and txt or util.splitToChars(txt)
|
||
local str_charlist = util.splitToChars(str)
|
||
local str_len = #str_charlist
|
||
local char_pos, found = 0, 0
|
||
for i = start_pos - 1, #txt_charlist - str_len do
|
||
for j = 1, str_len do
|
||
local char_txt = txt_charlist[i + j]
|
||
local char_str = str_charlist[j]
|
||
if not case_sensitive then
|
||
char_txt = Utf8Proc.lowercase(util.fixUtf8(char_txt, "?"))
|
||
end
|
||
if char_txt ~= char_str then
|
||
found = 0
|
||
break
|
||
end
|
||
found = found + 1
|
||
end
|
||
if found == str_len then
|
||
char_pos = i + 1
|
||
break
|
||
end
|
||
end
|
||
return char_pos
|
||
end
|
||
|
||
local WrappedFunction_mt = {
|
||
__call = function(self, ...)
|
||
if self.before_callback then
|
||
self.before_callback(self.target_table, ...)
|
||
end
|
||
if self.func then
|
||
return self.func(...)
|
||
end
|
||
end,
|
||
}
|
||
|
||
--- Wrap (or replace) a table method with a custom method, in a revertable way.
|
||
-- This allows you extend the features of an existing module by modifying its
|
||
-- internal methods, and then revert them back to normal later if necessary.
|
||
--
|
||
-- The most notable use-case for this is VirtualKeyboard's inputbox method
|
||
-- wrapping to allow keyboards to add more complicated state-machines to modify
|
||
-- how characters are input.
|
||
--
|
||
-- The returned table is the same table `target_table[target_field_name]` is
|
||
-- set to. In addition to being callable, the new method has two sub-methods:
|
||
--
|
||
-- * `:revert()` will un-wrap the method and revert it to the original state.
|
||
--
|
||
-- Note that if a method is wrapped multiple times, reverting it will revert
|
||
-- it to the state of the method when util.wrapMethod was called (and if
|
||
-- called on the table returned from util.wrapMethod, that is the state when
|
||
-- that particular util.wrapMethod was called).
|
||
--
|
||
-- * `:raw_call(...)` will call the original method with the given arguments
|
||
-- and return whatever it returns.
|
||
--
|
||
-- This makes it more ergonomic to use the wrapped table methods in the case
|
||
-- where you've replaced the regular function with your own implementation
|
||
-- but you need to call the original functions inside your implementation.
|
||
--
|
||
-- * `:raw_method_call(...)` will call the original method with the arguments
|
||
-- `(target_table, ...)` and return whatever it returns. Note that the
|
||
-- target_table used is the one associated with the util.wrapMethod call.
|
||
--
|
||
-- This makes it more ergonomic to use the wrapped table methods in the case
|
||
-- where you've replaced the regular function with your own implementation
|
||
-- but you need to call the original functions inside your implementation.
|
||
--
|
||
-- This is effectively short-hand for `:raw_call(target_table, ...)`.
|
||
--
|
||
-- This is loosely based on busted/luassert's spies implementation (MIT).
|
||
-- <https://github.com/Olivine-Labs/luassert/blob/v1.7.11/src/spy.lua>
|
||
--
|
||
-- @tparam table target_table The table whose method will be wrapped.
|
||
-- @tparam string target_field_name The name of the field to wrap.
|
||
-- @tparam nil|func new_func If non-nil, this function will be called instead of the original function after wrapping.
|
||
-- @tparam nil|func before_callback If non-nil, this function will be called (with the arguments (target_table, ...)) before the function is called.
|
||
function util.wrapMethod(target_table, target_field_name, new_func, before_callback)
|
||
local old_func = target_table[target_field_name]
|
||
local wrapped = setmetatable({
|
||
target_table = target_table,
|
||
target_field_name = target_field_name,
|
||
old_func = old_func,
|
||
|
||
before_callback = before_callback,
|
||
func = new_func or old_func,
|
||
|
||
revert = function(self)
|
||
if not self.reverted then
|
||
self.target_table[self.target_field_name] = self.old_func
|
||
self.reverted = true
|
||
end
|
||
end,
|
||
|
||
raw_call = function(self, ...)
|
||
if self.old_func then
|
||
return self.old_func(...)
|
||
end
|
||
end,
|
||
|
||
raw_method_call = function(self, ...)
|
||
return self:raw_call(self.target_table, ...)
|
||
end,
|
||
}, WrappedFunction_mt)
|
||
target_table[target_field_name] = wrapped
|
||
return wrapped
|
||
end
|
||
|
||
return util
|