DZone Snippets: convert code

Howto resize multiple pictures, graphics, images

Tue, 29 Apr 2008 16:41:33 GMT



for k in $(ls *.jpg); do convert -resize 800 -quality 80 $k r800-$k; done

date_select conversion

indiehead (John) — Thu, 17 Apr 2008 13:20:35 GMT

function to convert a value from a date_select into a more sql-friendly value



<%=date_select(:date,'',:start_year => 1950,:include_blank => false, :default => { :year => '1970' })%>



def convert_date(obj) 

  return “#{obj[‘(1i)’]}-#{obj[‘(2i)’]}-#{obj[‘(3i)’]}” 

end

Output JavaScript variables from PHP

jonasraoni (Jonas Raoni Soares Silva) — Wed, 09 Apr 2008 23:57:18 GMT

Class with useful static methods for outputting PHP values into JavaScript format.



//+ Jonas Raoni Soares Silva

//@ http://jsfromhell.com



class JS{

	//generic and maybe not the desired results xD

	function value($o){

		if($o === null)

			return 'null';

		$t = strtolower(gettype($o));

		if($t == 'string' && is_numeric($o) && ($o[0] || strlen($o) == 1) || in_array($t, array('double', 'integer')))

			$t = 'number';

		elseif($t == 'string' && preg_match('@^\d{4}(?:-\d{1,2}){1,2}(?: (?:\d{1,2}:){2}\d{1,2})?$@', $o)) //strtotime works also with "strange" values strtotime('x')

			$t = 'date';

		elseif($t == 'array' && ($c = count($k = array_keys($o))) && $k !== range(0, $c - 1))

			$t = 'object';

		elseif(!in_array($t, array('boolean', 'string', 'array', 'object')))

			$t = 'string';

		$t = 'from' . $t;

		return self::$t($o);

	}

	function fromNumber($o){

		return +$o . '';

	}

	function fromObject($o){

		$r = array();

		foreach($o as $n => $v)

			$r[] = self::fromString($n) . ':' . self::value($v);

		return '{' . implode(',', $r) . '}';

	}

	function fromBoolean($o){

		return $o ? 'true' : 'false';

	}

	//$q = should quote? 

	//$c = char that will be used to quote

	function fromString($o, $q = true, $c = '"'){

		return ($p = $q ? $c : '') . preg_replace('/\r\n|\n\r|\r/', '\n', str_replace($c, '\\' . $c, str_replace('\\', '\\\\', $o))) . $p;

	}

	function fromArray($o){

		$s = '';

		foreach($o as $v)

			$s .= ($s ? ',' : '') . self::value($v);

		return '[' . $s . ']';

	}

	function fromDate($o){

		(is_numeric($o) && $o = +$o) || ($o = strtotime($o)) > 0 || ($o = mktime());

		$o = explode(',', date('Y,n,j,G,i,s', $o));

		foreach($o as $i => $v)

			$o[$i] = +$v;

		return 'new Date(' . implode(',', $o)  . ')';

	}

}

Example



$o = new stdClass;

$o->abc = 123;

echo implode("\n
", array(

	JS::value('1984-07-22 11:30:12'),

	JS::value('Test'),

	JS::value(1234),

	JS::value(true),

	JS::value(array(1,2,3)),

	JS::value(array('lala' => 'x')),

	JS::value($o)

));

Batch re-size a collection of images from the command line

27stars (27stars) — Tue, 01 Apr 2008 09:33:24 GMT



for img in $(ls *.png); do convert $img -resize 75% smaller-$img; done;

UTF-8 Converter //JavaScript Object

jonasraoni (Jonas Raoni Soares Silva) — Sun, 30 Mar 2008 16:52:18 GMT

Converts a sequence of ANSI characters to UTF-8 and vice-versa.

[UPDATED CODE AND HELP CAN BE FOUND HERE]



//+ Jonas Raoni Soares Silva

//@ http://jsfromhell.com/geral/utf-8 [v1.0]



UTF8 = {

	encode: function(s){

		for(var c, i = -1, l = (s = s.split("")).length, o = String.fromCharCode; ++i < l;

			s[i] = (c = s[i].charCodeAt(0)) >= 127 ? o(0xc0 | (c >>> 6)) + o(0x80 | (c & 0x3f)) : s[i]

		);

		return s.join("");

	},

	decode: function(s){

		for(var a, b, i = -1, l = (s = s.split("")).length, o = String.fromCharCode, c = "charCodeAt"; ++i < l;

			((a = s[i][c](0)) & 0x80) &&

			(s[i] = (a & 0xfc) == 0xc0 && ((b = s[i + 1][c](0)) & 0xc0) == 0x80 ?

			o(((a & 0x03) << 6) + (b & 0x3f)) : o(128), s[++i] = "")

		);

		return s.join("");

	}

};

Example



var s = "aáéíóúe";

document.write(

	('UTF8.encode("' + s + '") = ').bold(), UTF8.encode(s), "
",

	('UTF8.decode(UTF8.encode("' + s + '"))) = ').bold(), UTF8.decode(UTF8.encode(s))

);

Increment a date using Ruby

jrobertson (James Robertson) — Wed, 05 Mar 2008 13:43:34 GMT

This Ruby code converts a string into a date and increments the day, week, month, quarter or year.



def date_add(sdate='', unit='',i=0)



  sdate[/(\d+)\/(\d+)\/(\d+)\s(\d+):(\d+):(\d+)/]

  iyear = $3.to_i; imonth = $2.to_i; iday = $1.to_i; ihour = $4.to_i; imin = $5.to_i; isec = $6.to_i

  

  case  unit

    when 'days'

      t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)

      t1 += (60 * 60 * 24 * i)

    when 'weeks'

      t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)

      t1 += (60 * 60 * 24 * 7 * i) 

    when 'months'

      imonth += i

      if imonth < 12 then

        t1 = Time.local(iyear,imonth+i,iday,ihour,imin,isec)

      else

        t1 = Time.local(iyear+=1,imonth -12,iday,ihour,imin,isec)

      end

    when 'quarter'

      imonth += 3

      if imonth <= 12 then

        t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)

      else

        t1 = Time.local(iyear+=1,imonth - 12,iday,ihour,imin,isec)

      end    

    when 'years'

      t1 = Time.local(iyear+i,imonth,iday,ihour,imin,isec)

    else

      raise 'not a valid date unit'

  end

  t1

end



date_add("17/03/2008 17:48:00",'months',2)

output: Sat May 17 17:48:00 +0100 2008

Convert from HTML to XHTML with HTML Tidy

jrobertson (James Robertson) — Fri, 08 Feb 2008 16:51:09 GMT

This HTML Tidy example converts an html file into an xml file.



tidy -asxhtml -numeric < index.html > index.xml

example found from Tip: Convert from HTML to XML with HTML Tidy [ibm.com]

Convert a UTF-8 string to ISO-8859-1

drcorbeille (Christian Meichtry) — Mon, 21 Jan 2008 14:35:26 GMT

Convert a utf string to iso, used this when generating a pdf with pdf-writer in Rails, all my text is UTF8 but pdf-writer does not support this.



#add this to environment.rb

#call to_iso on any UTF8 string to get a ISO string back

#example : "Cédez le passage aux français".to_iso



class String

  require 'iconv' #this line is not needed in rails !

  def to_iso

    Iconv.conv('ISO-8859-1', 'utf-8', self)

  end

end

Convert a video file to an audio file (.mp4 to .mp3)

jrobertson (James Robertson) — Sat, 13 Oct 2007 10:37:27 GMT

Convert an mp4 file to avi, then to mp3 (including mixing the stereo down to mono). This code was executed from the command-line on Ubuntu 7.04.



mencoder video.mp4 -ovc lavc -vf scale=123:100 -oac lavc -o video.avi

ffmpeg -i video.avi -ac 1 audio1.mp3

Convert a string to a character array

jrobertson (James Robertson) — Wed, 03 Oct 2007 13:32:03 GMT

// converts a string into a character array, then displays the output 1 character at a time from the array.



y = 'testing'.scan(/./)

y.each do |c|

	puts c

end