Difference between revisions of "Module:Sandbox/Erutuon/UTF-8"
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blackwiki>Erutuon (forEach function) |
blackwiki>Erutuon (alternative method) |
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| Line 5: | Line 5: | ||
local rshift = bit.rshift | local rshift = bit.rshift | ||
| − | + | function table.forEach(t, func) | |
for i, item in ipairs(t) do | for i, item in ipairs(t) do | ||
func(item) | func(item) | ||
| Line 11: | Line 11: | ||
end | end | ||
| − | local function | + | local function setMt(arr) |
| − | setmetatable( | + | setmetatable(arr, { __index = table }) |
end | end | ||
| Line 107: | Line 107: | ||
local function print(chars, bytes) | local function print(chars, bytes) | ||
| − | + | setMt(chars) | |
| − | + | setMt(bytes) | |
local output = { '{| class="wikitable"'} | local output = { '{| class="wikitable"'} | ||
chars:forEach( | chars:forEach( | ||
Revision as of 21:42, 17 September 2017
An experiment with printing binary digit representations of characters.
Usage
| a | ~ | ¡ | á | α | ᾰ | 𠀀 |
01100001 |
01111110 |
11000010 10100001 |
11000011 10100001 |
11001110 10110001 |
11100001 10111110 10110000 |
11110000 10100000 10000000 10000000 |
local p = {}
local bit = require("bit32")
local band = bit.band
local rshift = bit.rshift
function table.forEach(t, func)
for i, item in ipairs(t) do
func(item)
end
end
local function setMt(arr)
setmetatable(arr, { __index = table })
end
-- Converts a string representing a number in binary base to a Lua number.
local function binary(stringBinary)
return tonumber(stringBinary, 2)
end
-- Find the digit at a certain position in a byte.
local function digitAt(number, index)
if type(number) == "string" then
number = binary(number)
end
return band(rshift(number, 8 - index), 1)
end
-- Returns a table containing bits in a byte, from highest to lowest.
local function getBits(byte)
local t = {}
for bit = 8, 1, -1 do
t[bit] = band(byte, 1)
byte = rshift(byte, 1)
end
return t
end
-- mw.log(table.concat(getBits(rshift(binary("11100001"), 8 - 3))))
-- Do something to each byte in a string; put the result in a table.
local function iterBytes(str, func)
local out = {}
for i = 1, #str do
table.insert(out, func(string.byte(str, i)))
end
return out
end
local function markDigits(byteTable)
-- ASCII
local tag1 = { '<span style="color: darkgray;">', '</span>' }
-- leading bytes
local tag2 = { '<span style="color: deeppink;">', '</span>' }
-- continuation bytes
local tag3 = { '<span style="color: chocolate;">', '</span>' }
local onesCount = 0
for i, digit in ipairs(byteTable) do
if digit == 1 then
onesCount = onesCount + 1
else
local tag
-- ASCII (0x00 - 0x7F)
if onesCount == 0 then
tag = tag1
-- continuation bytes
elseif onesCount == 1 then
tag = tag3
-- leading bytes
else
tag = tag2
end
table.insert(byteTable, i + 1, tag[2])
table.insert(byteTable, 1, tag[1])
return byteTable
end
end
return byteTable
end
local function printBytes(str)
return table.concat(
iterBytes(
str,
function(byte)
return table.concat(markDigits(getBits(byte)))
end
),
" "
)
end
local function makeCharByteTables(str)
local chars = {}
local bytes = {}
local uLen = mw.ustring.len(str)
for i = 1, uLen do
local char = mw.ustring.sub(str, i, i)
table.insert(chars, char)
table.insert(bytes, printBytes(char))
end
return chars, bytes
end
local function print(chars, bytes)
setMt(chars)
setMt(bytes)
local output = { '{| class="wikitable"'}
chars:forEach(
function(char)
table.insert(output, "| " .. char)
end
)
table.insert(output, "|-")
bytes:forEach(
function(byteString)
table.insert(output, "| <code>" .. byteString .. "<code>")
end
)
table.insert(output, "|}")
return table.concat(output, "\n")
end
function p.show(frame)
local str = frame.args[1] or "abc πρᾶγμᾰ"
return print(makeCharByteTables(str))
end
return p