Beginner's Programming Challenge 17

**YourMomsASmurph** · December 2nd, 2010

Don't know how all your programs are so tiny. Looks like I'm gonna hit 600 lines. (C++) Though that does include my own custom Date and Task classes.

Question though: Should we include input validation

**roccivic** · December 3rd, 2010

Here's mine:

PHP Code:


<?php
    error_reporting(0);
    function error($text) {
        echo "ERROR: ".$text."<p><a href='".$_SERVER['PHP_SELF']."'>Click here to go back.</a>";
        die();
    }
?>
<!DOCTYPE html>
<head><title>Tasks</title></head>
<body>
<div style="width: 500px; padding: 20px; border: 1px solid black;">
<?php
    echo "Welcome. Today is " . date('l, j F Y') . ".<p>";
    if ( $_GET['action'] == "add" ) {    // If the user has requested to add a new task
        // Parse the parameter and , if possible, save the task
        $string = trim($_GET['task']);
        if ( empty( $string ) ) {
            error("No valid input was found.");
        }
        if ( strpos( $string, " due " ) === false ){
            error("Unable to parse the input.");
        }
        
        $date = substr( $string, strrpos($string, " due ") + strlen(" due ") );         
        $timestamp = strtotime( $date );
        if ( $timestamp == -1 || $timestamp === false ) { // PHP's internal could not parse the date, maybe it is the "in N timeunits" format.
            if ( strpos( $date, "in " ) !== false ) {
                if ( strpos( $date, " day" ) !== false ) {
                    $word = " day";
                    $multiplier = 24 * 3600;
                } elseif ( strpos( $date, " week" ) !== false ) {
                    $word = " week";
                    $multiplier = 7 * 24 * 3600;
                } else {
                    error("Unable to parse the date.");
                }
                $start = strpos( $date, "in " ) + strlen( "in " );
                $length = strpos( $date, $word ) - $start;
                $date = trim(substr( $date, $start, $length ));
                if ( is_numeric( $date ) && (int)$date == $date && (int)$date > 0 ) {
                    $date *= $multiplier;
                    $timestamp = time() + $date;
                } else {
                       error("Unable to parse the date.");
                }
            } else {
                error("Unable to parse the date.");
            }
        }
        
        $new_task = substr( $string, 0, strrpos($string, " due ") );
        $new_task =  $new_task . " due on " . date('l, j F Y', $timestamp) . "\n";
        echo "New task: " . $new_task;
        
        @ $fp = fopen( "taskfile", "a+" );
        if ( !$fp ) {
            echo "<p>";
            error("Unable to open the taskfile for writing.");
        } else {
            fputs($fp, $new_task);
            echo " has been successfully saved.";
            echo "<p><a href='".$_SERVER['PHP_SELF']."'>Click here to go back.</a>";
        }

    } else { // This is the default action
         // Read the file and display saved entries
        $tasks = array();
        @ $fp = fopen( "taskfile", "r" );
        if ( $fp ) {
            while ( !feof( $fp ) ) {
                $temp = fgets( $fp, 999 );
                if ( $temp ) {
                    $tasks[] = $temp;
                }
            }
        }
        echo "You currently have " . count( $tasks ) . " tasks.<p>";
        if ( count( $tasks ) ) {
            foreach ( $tasks as $key => $value ) {    
                echo "Task " . $key . ": $value<br>";
            }
        }
        ?>
        <p>
        <div style="padding: 15px; border: 1px dotted gray;">
        Please input a new task in the following format:<br><b>[Task Title] due [Date]</b> and click "Submit"<p>
        <form method="GET">
                <input type="hidden" name="action" value="add">
                <input type="text" name="task" style="width: 300px;">
                <input type="submit" value="Submit" style="width: 100px;">
        </form>
        </div>
        <?php
    }
?>
</div>
</body></html>

Features:
* Saves entries to a file and displays them
* Correctly handles "due" in the title

Sample input:

Code:

foo due now
foo due today
bar due wednesday
bar due tomorrow
foobar due next week
foo bar due next friday
bar foo due 5 dec 2010
bar goo due 5-12-2010
foo due in 2 days
foo due in 2 weeks

Corresponding output:

Code:

foo due on Friday, 3 December 2010
foo due on Friday, 3 December 2010
bar due on Wednesday, 8 December 2010
bar due on Saturday, 4 December 2010
foobar due on Monday, 6 December 2010
foo bar due on Friday, 10 December 2010
bar foo due on Sunday, 5 December 2010
bar goo due on Sunday, 5 December 2010
foo due on Sunday, 5 December 2010
foo due on Friday, 17 December 2010

Peace

**mo.reina** · December 7th, 2010

put up the revised edition

Code:

>>> main()
input task title and date:foo due tomorrow
foo due 2010-12-08
>>> main()
input task title and date:fue due day after tomorrow
fue due 2010-12-09
>>> main()
input task title and date:fue due 12 nov 2010
fue due 2010-11-12 00:00:00
>>> main()
input task title and date:foo due in 10 days
foo due 2010-12-17
>>> main()
input task title and date:foo due friday
foo due 2010-12-10
>>> main()
input task title and date:foo due in 365 days
foo due 2011-12-07

**cprofitt** · January 11th, 2011

bump: will this one be concluding and a new one be put up soon?

**appi2012** · January 12th, 2011

Yes, the contest has closed, and I'm reviewing the entries. A winner will be announced shortly.

**Tony Flury** · January 13th, 2011

As an aside - on a project I once worked on we developed a date algebra for our reporting system - so we could set up a repeating schedule of reports with variable dates, and run the same reports over weeks, months etc. The algebra worked like this

Start -7D
End -1D

When this report runs the Start paremeter would be calcualted at 7 days prior to the run date and the End parameter would be calulated as 1 day prior to the run date.

We also could do Weeks - using the W Identifier, and Months - using the M Identifier - these had wrinkles - W went to the previous Monday (i.e. the start of the business week), unless the current date was a monday), and M went to the start of the Month (unless the current date was the 1st).

Algebra was calculated left to right so :

Start : -2W
End : -1W - 1D

this would run a report over the last full week - Monday to Sunday

Start : -2M
End : -1M -1D

Would run the report but over the last full month.

Operators worked intuitively "-" (minus) moved the "clock" backwards, "+" moved it forward.

so :
Start : -1W
End : +1W -1D

Would run the report for this current weeks data.

**appi2012** · January 16th, 2011

And the Winner is...
roccivic, for the nice display, saving of the tasks, and good error handling.

I would like to give a special shout out to krazyd for the (extremely) concise code. Also, ziekfiguur had a very unique, expandable solution.

All the code I tried worked (I only had to make some small changes), so great job to all participants!

As per contest tradition, roccivic is now in charge of submitting the next challenge.

Good luck to all participants in future challenges!

**roccivic** · January 17th, 2011

That's nice, thanks.

I'll post a new challenge some time soon.

Rouslan

**Queue29** · January 17th, 2011

You can play with roccivic's solution live here:

http://bozosort.com/dloads/roccivic.php

No hacking my server please

**roccivic** · January 17th, 2011

Originally Posted by Queue29

You can play with roccivic's solution live here:

http://bozosort.com/dloads/roccivic.php

No hacking my server please

I just exploited an XSS vulnerability on it, lol.

But that doesn't count as hacking your server, right?

You might want to change line 16, from:

PHP Code:


        $string = trim($_GET['task']);

to:

PHP Code:


        $string = trim(strip_tags($_GET['task']));

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