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Introduction - template syntax

Introduction - template syntax -- Creating and editing templates

Placeholders

The default format of placeholder is
{[0-9A-Za-z_-]+}
This means, the name of the placeholder can consist of upper- and lowercase letters, underscores and hyphens. The name must be placed between curly brackets without any spaces.

Actual values for the placeholders are set using setVariable() and setGlobalVariable() methods. Placeholders for which no values were set are removed from output by default.

Blocks

The format of a block is
 ... block content ... 
The rules for the block name are the same like for placeholders. In contrast to placeholders the spaces in the block markup are required.

The nesting of blocks is permitted, but be careful while parsing. You have to parse() the innermost block first and then go from inner to outer.

In Sigma the whole template itself is treated as a virtual block called "__global__". Most block-related functions use this block name as default.

statements

It is possible to include a template file from within another template file using an  statement:
... some content ...  ... some more content ...
When such a template file gets loaded, the  will be replaced by contents of filename.html.

Some things to note:

Although this functionality is implemented using addBlockfile(), unlike addBlockfile() no new blocks are created in the template.
 calls are processed before any variable substitution can take place. So  will not work unless you actually have a file named {placeholder} and want to load it.

Template functions

Sigma templates can contain simple function calls. This means that the author of the template can add a special placeholder to it
... some content ... func_h1("embedded in h1") ... some more content ...
Sigma will parse the template for these placeholders and will allow you to define a callback function for them via setCallbackFunction(). Callback will be called automatically when the block containing such function call is parse()'d.

Format of such function name is as follows
func_[_a-zA-Z]+[A-Za-z_0-9]*
that means that it should start with a 'func_' prefix, then has a letter or an undercore and then a sequence of letters, digits or underscores. Arguments to these template functions can contain variable placeholders
func_translate('Hello, {username}')
but not blocks or other function calls.

Shorthand for template functions

Since release 1.1.0, instead of using
func_callback({var})
you can write
{var:callback}
There are 3 automatically registered template functions

'h' for htmlspecialchars()
'u' for urlencode()
'j' for a method of Sigma that escapes the string for usage in Javascript string constants.

Thus, if you add {var:h} placeholder to the template, var will be have unsafe characters replaced by corresponding HTML entitites.

Usage Example

Other usage examples: There are several usage examples in the package archive that cover most of its functionality. You are encouraged to review them along with the docs.

Пример 27-1. The table.html template file

<html>
<body>
<table cellpadding="2" cellspacing="0" border="1">
<!-- INCLUDE table_header.html -->
<!-- BEGIN table_row -->
    <tr>
        <td bgcolor="func_bgcolor('#CCCCCC', '#F0F0F0')">{first_name}</td>
        <td bgcolor="func_bgcolor('#CCCCCC', '#F0F0F0')">{last_name}</td>
    </tr>
<!-- END table_row -->
</table>
</body>
</html>

Пример 27-2. The table_header.html template file

<tr>
        <th>First name</th>
        <th>Last name</th>
    </tr>

Пример 27-3. The script

<?php

require_once 'HTML/Template/Sigma.php';

function toggle($item1, $item2)
{
    static $i = 1;

    return $i++ % 2? $item1: $item2;
}

$data = array (
    array("Stig", "Bakken"),
    array("Martin", "Jansen"),
    array("Alexander", "Merz")
);

$tpl =& new HTML_Template_Sigma('.');

$tpl->loadTemplateFile('table.html');

$tpl->setCallbackFunction('bgcolor', 'toggle');

foreach ($data as $name) {
    // assign data
    $tpl->setVariable(array(
        'first_name'  => $name[0],
        'last_name' => $name[1]
    ));
    // process the block
    $tpl->parse('table_row');
}

// print out the output
$tpl->show();
?>

Пример 27-4. The output

<html>
<body>
<table cellpadding="2" cellspacing="0" border="1">
    <tr>
        <th>First name</th>
        <th>Last name</th>
    </tr>


    <tr>
        <td bgcolor="#CCCCCC">Stig</td>
        <td bgcolor="#CCCCCC">Bakken</td>
    </tr>

    <tr>
        <td bgcolor="#F0F0F0">Martin</td>
        <td bgcolor="#F0F0F0">Jansen</td>
    </tr>

    <tr>
        <td bgcolor="#CCCCCC">Alexander</td>
        <td bgcolor="#CCCCCC">Merz</td>
    </tr>

</table>
</body>
</html>

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