SoFunction
Updated on 2025-04-07

Lua implements file reading methods in positive and reverse order

Lua implements file reading methods in positive and reverse order

Updated: April 22, 2015 10:28:09 Submission: junjie
This article mainly introduces Lua's file reading method to implement positive and reverse order. This article explains the use of table to generate linked lists to complete the file reading function of positive and reverse order. Friends who need it can refer to it
--table characteristic
-- usetableGenerate a list of positive and reverse orders

-- usetableGenerate a link table

list = nil
local file = ("","r") -->Open this book

pre = nil
--Read this file in line orderlistmiddle
for line in file:lines() do  
	current = {next = nil,value = line}
	pre = pre or current
	list = list or pre
	 = current
	pre = current
end

file:close() -- Close the file

-- Outputlist
local l = list
while l do
	print()
	l = 
end

-- The following is the method of reverse order by row
print("The following is the output file in reverse order:\n")
local file = ("","r") -->Open this book

list = nil --ClearlistPrevious content

for line in file:lines() do
	list = {next = list,value = line}
end

file:close() -- Close the file
-- Outputlist
local l = list
while l do
	print()
	l = 
end
  • Lua
  • Formal order
  • Inverse order
  • File reading

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