ITEC 325 2014spring ibarland

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hw02
hw02: Functions that return (html) text

As in hw01, you'll have three files:

• utils.php, which contains only code for php functions.
• utils-test.php, which contains only the runnable test cases for those functions.

  This time, your tests should be (mostly) silent on success, and only print output when a test fails, such as utils-test-v2-php.txt. A successful test can print nothing, or perhaps some small progress-indication like “.”.

  secret agenda: I'm hoping that typing all the tests is so verbose, that you get fed up and automated it by writing your own function — something like test( $actual, $expected ).

• silly-page.php, which (when run) just prints out (what happens to be) valid html for a web page that includes a pluralized noun, a hyperlink, and a thumbnail (all created by calling your functions).

  This time, silly-page.php should be mostly not enclosed in <?php>.

Notes:

• All files for this class (and for all your classes) must start with a comment containing: Your name; the class/semester; the URL of this assignment page.
• Note that although some lecture examles use javadoc for their documentation of functions, you don't need to do so (but you do need a similar level of documentation for your function-definitions).

1. (10pts) Write a function string hyperlink( string $url, string-or-boolean $linkTxt ) which returns a string of html. If the provided $linkTxt is false (instead of a string), then use the $url as the link text.
   hyperlink( "http://www.gutenberg.org", "free books!" ) === "<a href='http://www.gutenberg.org'>free books!</a>"
   hyperlink( "myLocalFile.html", false ) === "<a href='myLocalFile.html'>myLocalFile.html</a>"

   Note that this is just a regular ol' function that takes in strings and returns strings!
   The fact that the strings happen to have angle-brackets in them means that the result might be useful to people generating html, but the function itself does't really care.

   (You don't need to come up with additional test cases, but you do need to actually include these tests or their equivalent. You can assume that neither string is ever empty.)

   Note how the input strings don't contain any quote-characters, but the returned result does (since HTML attributes must be quoted). I recommend that your generated html uses single quote marks around attributes, but you'll get full credit for either single- or double-quote marks, as long as it is valid HTML. Make sure your test case(s) express exactly what you want the desired output should be!

2. (10pts) Thumbnails:
   1. What is the html element for an image with source pony.jpg (in the same directory), that is rendered 300px wide?
      Include your answer in a comment, in your test-file.
   2. What is the html for such an image which is also a link — where the link would take you to that file (not a html page — just that file).
      Include your answer in a comment, in your test-file.

   3. Make a test-case for thumbnail("pony.jpg",300); the expected-output should be a string that happened to be your answer.
      You don't need further test-cases for this problem.

      Pay close attention to the exact spacing you want to have. I recommend using single-quotes (') around the attribute-values. (We'll discuss this more on Monday.)

   4. Finally, implement the function thumbnail that takes in a string (a URL) and a number (the width in pixels), and returns a string that is an html link containing an image.

      For full credit, your function should call hyperlink as already written!

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©2014, Ian Barland, Radford University Last modified 2014.Feb.01 (Sat)

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