fix issue #242 Malformed URL validator for attribute 'href' in tag A

[iransamaneh]

add host check to detect malformed urls supporting ipv6, ipv4 and normal url

[iransamaneh]

it's error is on tests/test-data/full-html/incorrect_custom_style.html url and there is not any relation between my changes and this error.

please accept and done my pull request. i changed related test files to my changes with.html and .html.out files extension

[iransamaneh]

Error Details

There was 1 failure:

1. AmpTest::testFiles with data set "tests/test-data/full-html/incorrect_custom_style.html" ('tests/test-data/full-html/inc...e.html', true)
   Failed asserting that two strings are equal.
   --- Expected
   +++ Actual
   @@ @@

<style amp-custom> on line 27 +- CSS syntax error in tag 'style amp-custom' - CSS Parser Error: preg_match(): Compilation failed: character value in \x{} or \o{} is too large at offset 32. + [code: CSS_SYNTAX category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets] @@ @@ - CSS syntax error in tag 'style amp-custom' - invalid url protocol 'invalid:'. - [code: CSS_SYNTAX_INVALID_URL_PROTOCOL category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets] - -<style amp-custom> on line 48 -- CSS syntax error in tag 'style amp-custom' - invalid url protocol 'invalid:'. - [code: CSS_SYNTAX_INVALID_URL_PROTOCOL category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets] - -<style amp-custom> on line 51 -- CSS syntax error in tag 'style amp-custom' - invalid url protocol 'absolute:'. [code: CSS_SYNTAX_INVALID_URL_PROTOCOL category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets] COMPONENT NAMES WITH JS PATH ------------------------------ No custom amp script includes required ' /home/travis/build/Lullabot/amp-library/tests/AmpTest.php:56 FAILURES! Tests: 61, Assertions: 42, Errors: 19, Failures: 1. The command "vendor/bin/phpunit tests" exited with 2. Done. Your build exited with 1.

[iransamaneh]

Hi. anybody there!

[ghost]

If you look at the Travis build you can see that the change broke some tests. One test that broke is an example that uses https://ad as the url in the sample, which wasn't intended to be a test for a valid url. The test would need to be updated.

Also the crazy regex looks pretty daunting. I wouldn't want to add that in without a bunch of tests that it correctly handles all kinds of urls to be sure it isn't going to create havoc on sites that work fine now.