Parsing data sources
In brief
One of the great features of HTML_CSS is to parse and load existing style sheet
from different data sources : (simple string, css file, combine).
We will see in detail all these possibilities with 3 methods :
HTML_CSS::parseString(),
HTML_CSS::parseFile() and
HTML_CSS::parseData().
Parse a simple string
A quick way to create multiple selector definitions in one step is to use the
HTML_CSS::parseString() function.
Let creates these definitions :
html, body {
margin: 2px;
padding: 0px;
border: 0px;
}
p, body {
margin: 4px;
}
Very easy with such script :
<?php
require_once 'HTML/CSS.php';
$css = new HTML_CSS();
$strcss = '
html, body {
margin: 2px;
padding: 0px;
border: 0px;
}
p, body {
margin: 4px;
}
';
$css->parseString($strcss);
$css->display();
?>
Parse a file contents
Another quick way to create multiple selector definitions in one step is to use the
HTML_CSS::parseFile() function.
CSS file to load is supposed to be W3C/CSS compliant.
If previous selector definitions was into a file named 'styles.css', then to parse and load contents will be done with such script :
<?php
require_once 'HTML/CSS.php';
$css = new HTML_CSS();
$css->parseFile('styles.css');
$css->display();
?>
If there are duplicate definitions into file contents, you should parse file with call :
<?php
$css->parseFile('styles.css', true);
?>We will see next why we may find such duplicate definitions.
Parse multi data sources
We have already seen two single sources where CSS data could come from.
The last one allow to parse data from multiple sources at once.
HTML_CSS::parseData() function take an array
as first argument. Each item is either a filename (with .css extension) or
a string. Each source is merge to produce at end a unique style sheet.
In script below we load selector definitions from two independent sources: a string and a css file which contents duplicate definitions (parseFile() 2nd argument to set to true to catch this situation; see next section for explains). Internet Explorer).
<?php
require_once 'HTML/CSS.php';
$css = new HTML_CSS();
// 1. a string to parse
$strcss = '
body, p { background-color: white; font: 1.2em Arial; }
p, div#black { color: black; }
div{ color: green; }
p { margin-left: 3em; }
';
$css->parseString($strcss);
// 2. a css file with duplicate definitions
$css->parseFile('iehack.css', true);
$css->display();
?>
Allow duplicate definitions
Internet Explorer <= 6 does not handle box model in same way as others browsers that are better W3C compliant. For this reason, we need to fix boxes size with a hack such as this one you can find in example that follow. You can notice the duplicate 'voice-family' and 'height' properties.
To parse these definitions we need to activate the duplicate option of HTML_CSS.
#header {
background-color: ivory;
font-family: "Times New Roman", Times, serif;
font-size: 5mm;
text-align: center;
/* IE 5.5 */
height:81px;
border-top:1px solid #000;
border-right:1px solid #000;
border-left:1px solid #000;
voice-family: "\"}\"";
voice-family: inherit;
/* IE 6 */
height: 99px;
}
There are two ways :
-
global to all functions: set option allowduplicates on class constructor
-
local to a function: set argument duplicates to TRUE
For example here, we could wrote either (allow global duplicate) :
<?php
require_once 'HTML/CSS.php';
$attr = array('allowduplicates' => true);
$css = new HTML_CSS($attr);
$strcss = '
#header {
background-color: ivory;
font-family: "Times New Roman", Times, serif;
font-size: 5mm;
text-align: center;
/* IE 5.5 */
height:81px;
border-top:1px solid #000;
border-right:1px solid #000;
border-left:1px solid #000;
voice-family: "\"}\"";
voice-family: inherit;
/* IE 6 */
height: 99px;
}
';
$css->parseString($strcss);
$css->display();
?>
or also (duplicate on local call) :
<?php
require_once 'HTML/CSS.php';
$css = new HTML_CSS();
$strcss = '
#header {
background-color: ivory;
font-family: "Times New Roman", Times, serif;
font-size: 5mm;
text-align: center;
/* IE 5.5 */
height:81px;
border-top:1px solid #000;
border-right:1px solid #000;
border-left:1px solid #000;
voice-family: "\"}\"";
voice-family: inherit;
/* IE 6 */
height: 99px;
}
';
$css->parseString($strcss, true);
$css->display();
?>