91 lines
2.9 KiB
Lua
91 lines
2.9 KiB
Lua
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local sys = require "sys"
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local math = require "math"
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local table = require "table"
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local base = _G
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module("scramble")
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function scramble(text)
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local all_breaks = '/.-{}()[]<>|,;!?'
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local breaks = {}
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for idx = 1, #all_breaks do
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breaks[all_breaks:sub(idx, idx)]=true
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end
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-- print(#breaks)
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local mode = "up"
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local interval = 0.2
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local swap_end
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local next_action = sys.now() + interval
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local stack = {}
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local function is_break(text, pos)
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local char = text:sub(pos, pos)
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local is_break = breaks[char]
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-- print(char, is_break)
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return is_break, char
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end
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local function random_break()
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local pos = math.random(1, #all_breaks)
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return all_breaks:sub(pos, pos)
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end
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local function replace2(text, pos, c1, c2)
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return text:sub(1, pos-1) .. c1 .. c2 .. text:sub(pos+2)
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end
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local function replace(text, pos, c)
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return text:sub(1, pos-1) .. c .. text:sub(pos+1)
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end
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local function get()
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local now = sys.now()
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if now > next_action then
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-- print(mode)
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if mode == "up" then
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local pos, is_1_break, is_2_break, char_1, char_2
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repeat
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pos = math.random(1, #text-1)
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is_1_break, char_1 = is_break(text, pos)
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is_2_break, char_2 = is_break(text, pos+1)
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until is_1_break ~= is_2_break
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-- print(pos, is_1_break, is_2_break)
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if is_1_break then
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table.insert(stack, {pos, random_break(), char_2})
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text = replace2(text, pos, char_2, random_break())
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else
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table.insert(stack, {pos, char_1, random_break()})
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text = replace2(text, pos, random_break(), char_1)
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end
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interval = interval - 0.01
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if interval < 0.02 then
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mode = "down"
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end
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elseif mode == "down" then
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local pos, char1, char2 = base.unpack(table.remove(stack, #stack))
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text = replace2(text, pos, char1, char2)
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interval = interval + 0.01
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if #stack == 0 then
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mode = "swap"
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swap_end = now + 15
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interval = 2
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end
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elseif mode == "swap" then
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local pos, is_break_char, _
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repeat
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pos = math.random(1, #text-1)
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is_break_char, _ = is_break(text, pos)
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until is_break_char
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text = replace(text, pos, random_break())
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if now > swap_end then
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interval = 0.2
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mode = "up"
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end
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end
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next_action = now + interval
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end
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return text
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end
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return get
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end
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