Difference between revisions of "love.filesystem.lines"
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+ | {{newin|[[0.5.0]]|050|type=function}} | ||
+ | Iterate over the lines in a file. | ||
− | |||
== Function == | == Function == | ||
=== Synopsis === | === Synopsis === | ||
Line 9: | Line 10: | ||
{{param|string|name|The name (and path) of the file}} | {{param|string|name|The name (and path) of the file}} | ||
=== Returns === | === Returns === | ||
− | {{param|function|iterator|A function that iterates over all the lines in the file}} | + | {{param|function|iterator|A function that iterates over all the lines in the file, returning the line with newlines stripped (if the line ends with <code>\r\n</code>, both are stripped independently of the OS)}} |
+ | |||
+ | == Examples == | ||
+ | |||
+ | === Load highscore list === | ||
+ | <source lang="lua"> | ||
+ | local highscores = {} | ||
+ | for line in love.filesystem.lines("highscores.txt") do | ||
+ | table.insert(highscores, tonumber(line)) | ||
+ | end | ||
+ | </source> | ||
+ | |||
+ | === Load comma separated values === | ||
+ | <source lang="lua"> | ||
+ | local function splitCsvLine(line) | ||
+ | local values = {} | ||
+ | |||
+ | for value in line:gmatch("[^,]+") do -- Note: We won't match empty values. | ||
+ | -- Convert the value string to other Lua types in a "smart" way. | ||
+ | if tonumber(value) then table.insert(values, tonumber(value)) -- Number. | ||
+ | elseif value == "true" then table.insert(values, true) -- Boolean. | ||
+ | elseif value == "false" then table.insert(values, false) -- Boolean. | ||
+ | else table.insert(values, value) -- String. | ||
+ | end | ||
+ | end | ||
+ | |||
+ | return values | ||
+ | end | ||
+ | |||
+ | local function loadCsvFile(filename) | ||
+ | local csv = {} | ||
+ | for line in love.filesystem.lines(filename) do | ||
+ | table.insert(csv, splitCsvLine(line)) | ||
+ | end | ||
+ | return csv | ||
+ | end | ||
+ | |||
+ | --[[ cool.csv: | ||
+ | Foo,Bar | ||
+ | true,false,11.8 | ||
+ | ]] | ||
+ | local csv = loadCsvFile("cool.csv") | ||
+ | for row, values in ipairs(csv) do | ||
+ | print("row="..row.." count="..#values.." values=", unpack(values)) | ||
+ | end | ||
+ | </source> | ||
+ | |||
== See Also == | == See Also == | ||
+ | * [[love.filesystem.read]] | ||
* [[parent::love.filesystem]] | * [[parent::love.filesystem]] | ||
+ | |||
[[Category:Functions]] | [[Category:Functions]] | ||
− | {{#set:Description=Iterate over the lines in a file}} | + | {{#set:Description=Iterate over the lines in a file.}} |
+ | {{#set:Since=000}} | ||
+ | |||
+ | == Other Languages == | ||
+ | {{i18n|love.filesystem.lines}} |
Latest revision as of 02:39, 21 October 2022
Available since LÖVE 0.5.0 |
This function is not supported in earlier versions. |
Iterate over the lines in a file.
Contents
Function
Synopsis
iterator = love.filesystem.lines( name )
Arguments
string name
- The name (and path) of the file
Returns
function iterator
- A function that iterates over all the lines in the file, returning the line with newlines stripped (if the line ends with
\r\n
, both are stripped independently of the OS)
Examples
Load highscore list
local highscores = {}
for line in love.filesystem.lines("highscores.txt") do
table.insert(highscores, tonumber(line))
end
Load comma separated values
local function splitCsvLine(line)
local values = {}
for value in line:gmatch("[^,]+") do -- Note: We won't match empty values.
-- Convert the value string to other Lua types in a "smart" way.
if tonumber(value) then table.insert(values, tonumber(value)) -- Number.
elseif value == "true" then table.insert(values, true) -- Boolean.
elseif value == "false" then table.insert(values, false) -- Boolean.
else table.insert(values, value) -- String.
end
end
return values
end
local function loadCsvFile(filename)
local csv = {}
for line in love.filesystem.lines(filename) do
table.insert(csv, splitCsvLine(line))
end
return csv
end
--[[ cool.csv:
Foo,Bar
true,false,11.8
]]
local csv = loadCsvFile("cool.csv")
for row, values in ipairs(csv) do
print("row="..row.." count="..#values.." values=", unpack(values))
end
See Also
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