首页 \ 问答 \ Haskell GHCi - 使用getContents在stdin上使用EOF字符(Haskell GHCi - Using EOF character on stdin with getContents)

Haskell GHCi - 使用getContents在stdin上使用EOF字符(Haskell GHCi - Using EOF character on stdin with getContents)

 我喜欢通过粘贴到解释器来解析Python中的特殊字符串。  
>>> s = """Adams, John
... Washington,George
... Lincoln,Abraham
... Jefferson, Thomas
... """
>>> print "\n".join(x.split(",")[1].replace(" ", "")
                    for x in s.strip().split("\n"))
John
George
Abraham
Thomas
 
 这很适合使用Python解释器，但我想用Haskell / GHCi来做这件事。 问题是，我无法粘贴多行字符串。 我可以使用带有EOF字符的getContents，但是我只能执行一次，因为EOF字符关闭stdin。  
Prelude> s <- getContents
Prelude> s
"Adams, John
Adams, John\nWashington,George
Washington,George\nLincoln,Abraham
Lincoln,Abraham\nJefferson, Thomas
Jefferson, Thomas\n^Z
"
Prelude> :{
Prelude| putStr $ unlines $ map ((filter (`notElem` ", "))
Prelude|                         . snd . (break (==','))) $ lines s
Prelude| :}
John
George
Abraham
Thomas
Prelude> x <- getContents
*** Exception: <stdin>: hGetContents: illegal operation (handle is closed)
 
 使用GHCi有更好的方法吗？ 注意 - 我对getContents（以及一般的Haskell IO）的理解可能会严重破坏。  
 更新  
 我会玩我收到的答案。 下面是我制作的一些帮助函数（剽窃），它模仿了Python的"""引用（以"""结尾，而不是从”ephemient“的答案结束）。  
getLinesWhile :: (String -> Bool) -> IO String
getLinesWhile p = liftM unlines $ takeWhileM p (repeat getLine)

getLines :: IO String
getLines = getLinesWhile (/="\"\"\"")
 
 在GHCi中使用AndrewC的答案 -  
C:\...\code\haskell> ghci HereDoc.hs -XQuasiQuotes
ghci> :{
*HereDoc| let s = [heredoc|
*HereDoc| Adams, John
*HereDoc| Washington,George
*HereDoc| Lincoln,Abraham
*HereDoc| Jefferson, Thomas
*HereDoc| |]
*HereDoc| :}
ghci> putStrLn s
Adams, John
Washington,George
Lincoln,Abraham
Jefferson, Thomas
ghci> :{
*HereDoc| putStr $ unlines $ map ((filter (`notElem` ", "))
*HereDoc|                         . snd . (break (==','))) $ lines s
*HereDoc| :}
John
George
Abraham
Thomas

I like to parse strings ad hoc in Python by just pasting into the interpreter. 
>>> s = """Adams, John
... Washington,George
... Lincoln,Abraham
... Jefferson, Thomas
... """
>>> print "\n".join(x.split(",")[1].replace(" ", "")
                    for x in s.strip().split("\n"))
John
George
Abraham
Thomas
 
This works great using the Python interpreter, but I'd like to do this with Haskell/GHCi. Problem is, I can't paste multi-line strings. I can use getContents with an EOF character, but I can only do it once since the EOF character closes stdin. 
Prelude> s <- getContents
Prelude> s
"Adams, John
Adams, John\nWashington,George
Washington,George\nLincoln,Abraham
Lincoln,Abraham\nJefferson, Thomas
Jefferson, Thomas\n^Z
"
Prelude> :{
Prelude| putStr $ unlines $ map ((filter (`notElem` ", "))
Prelude|                         . snd . (break (==','))) $ lines s
Prelude| :}
John
George
Abraham
Thomas
Prelude> x <- getContents
*** Exception: <stdin>: hGetContents: illegal operation (handle is closed)
 
Is there a better way to go about doing this with GHCi? Note - my understanding of getContents (and Haskell IO in general) is probably severely broken. 
UPDATED 
I will be playing with the answers I have received. Here are some helper functions I made (plagiarized) that simulate Python's """ quoting (by ending with """, not starting) from ephemient's answer. 
getLinesWhile :: (String -> Bool) -> IO String
getLinesWhile p = liftM unlines $ takeWhileM p (repeat getLine)

getLines :: IO String
getLines = getLinesWhile (/="\"\"\"")
 
To use AndrewC's answer in GHCi - 
C:\...\code\haskell> ghci HereDoc.hs -XQuasiQuotes
ghci> :{
*HereDoc| let s = [heredoc|
*HereDoc| Adams, John
*HereDoc| Washington,George
*HereDoc| Lincoln,Abraham
*HereDoc| Jefferson, Thomas
*HereDoc| |]
*HereDoc| :}
ghci> putStrLn s
Adams, John
Washington,George
Lincoln,Abraham
Jefferson, Thomas
ghci> :{
*HereDoc| putStr $ unlines $ map ((filter (`notElem` ", "))
*HereDoc|                         . snd . (break (==','))) $ lines s
*HereDoc| :}
John
George
Abraham
Thomas

原文：https://stackoverflow.com/questions/12119420

更新时间：2023-06-20 17:06

最满意答案

 演示网址： -  
 http://jquery.malsup.com/form/progress.html  
 你可以从这个URL下载jQuery文件并添加html <head>标签  
 http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.js  
 http://malsup.github.com/jquery.form.js  
 尝试这个：  
 这是我的HTML标记：  
<!doctype html>
<head>
<title>File Upload Progress Demo #1</title>
<style>
body { padding: 30px }
form { display: block; margin: 20px auto; background: #eee; border-radius: 10px; padding: 15px }

.progress { position:relative; width:400px; border: 1px solid #ddd; padding: 1px; border-radius: 3px; }
.bar { background-color: #B4F5B4; width:0%; height:20px; border-radius: 3px; }
.percent { position:absolute; display:inline-block; top:3px; left:48%; }
</style>
</head>
<body>
    <h1>File Upload Progress Demo #1</h1>
    <code>&lt;input type="file" name="myfile"></code>
        <form action="upload.php" method="post" enctype="multipart/form-data">
        <input type="file" name="uploadedfile"><br>
        <input type="submit" value="Upload File to Server">
    </form>

    <div class="progress">
        <div class="bar"></div >
        <div class="percent">0%</div >
    </div>

    <div id="status"></div>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.js"></script>
<script src="http://malsup.github.com/jquery.form.js"></script>
<script>
(function() {

var bar = $('.bar');
var percent = $('.percent');
var status = $('#status');

$('form').ajaxForm({
    beforeSend: function() {
        status.empty();
        var percentVal = '0%';
        bar.width(percentVal)
        percent.html(percentVal);
    },
    uploadProgress: function(event, position, total, percentComplete) {
        var percentVal = percentComplete + '%';
        bar.width(percentVal)
        percent.html(percentVal);
    },
    complete: function(xhr) {
     bar.width("100%");
    percent.html("100%");
        status.html(xhr.responseText);
    }
}); 

})();       
</script>

</body>
</html>   
 
 我的php代码：  
<?php
$target_path = "uploads/";

$target_path = $target_path . basename( $_FILES['uploadedfile']['name']); 

if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
    echo "The file ".  basename( $_FILES['uploadedfile']['name']). 
    " has been uploaded";
} else{
    echo "There was an error uploading the file, please try again!";
}
?>

Demo url:-- 
http://jquery.malsup.com/form/progress.html 
You can download jQuery files from this url and add in html <head> tag  
http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.js 
http://malsup.github.com/jquery.form.js 
Try this: 
This is my html markup: 
<!doctype html>
<head>
<title>File Upload Progress Demo #1</title>
<style>
body { padding: 30px }
form { display: block; margin: 20px auto; background: #eee; border-radius: 10px; padding: 15px }

.progress { position:relative; width:400px; border: 1px solid #ddd; padding: 1px; border-radius: 3px; }
.bar { background-color: #B4F5B4; width:0%; height:20px; border-radius: 3px; }
.percent { position:absolute; display:inline-block; top:3px; left:48%; }
</style>
</head>
<body>
    <h1>File Upload Progress Demo #1</h1>
    <code>&lt;input type="file" name="myfile"></code>
        <form action="upload.php" method="post" enctype="multipart/form-data">
        <input type="file" name="uploadedfile"><br>
        <input type="submit" value="Upload File to Server">
    </form>

    <div class="progress">
        <div class="bar"></div >
        <div class="percent">0%</div >
    </div>

    <div id="status"></div>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.js"></script>
<script src="http://malsup.github.com/jquery.form.js"></script>
<script>
(function() {

var bar = $('.bar');
var percent = $('.percent');
var status = $('#status');

$('form').ajaxForm({
    beforeSend: function() {
        status.empty();
        var percentVal = '0%';
        bar.width(percentVal)
        percent.html(percentVal);
    },
    uploadProgress: function(event, position, total, percentComplete) {
        var percentVal = percentComplete + '%';
        bar.width(percentVal)
        percent.html(percentVal);
    },
    complete: function(xhr) {
     bar.width("100%");
    percent.html("100%");
        status.html(xhr.responseText);
    }
}); 

})();       
</script>

</body>
</html>   
 
My php code: 
<?php
$target_path = "uploads/";

$target_path = $target_path . basename( $_FILES['uploadedfile']['name']); 

if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
    echo "The file ".  basename( $_FILES['uploadedfile']['name']). 
    " has been uploaded";
} else{
    echo "There was an error uploading the file, please try again!";
}
?>

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Haskell GHCi - 使用getContents在stdin上使用EOF字符(Haskell GHCi - Using EOF character on stdin with getContents)

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