テンプレートパーサクラス

テンプレートパーサクラスを使うと、ビューファイルに含まれる 擬似変数を解析できます。 単一の擬似変数と擬似変数のペアを解析できます。

テンプレートエンジンを一度も使ったことがないでしょうか? 擬似変数とは次のようなものです:

<html>
        <head>
                <title>{blog_title}</title>
        </head>
        <body>
                <h3>{blog_heading}</h3>

        {blog_entries}
                <h5>{title}</h5>
                <p>{body}</p>
        {/blog_entries}

        </body>
</html>

これらの疑似変数は、本当の PHP 変数ではなく、 テンプレート (ビューファイル)からPHPを取り除くための、 普通のテキストです。

Note

ビューページで純粋なPHPを使う方が少し早いので、CodeIgniterでは、 このクラスを必ずしも 必要としません。 しかし、PHPのコードで混乱してしまうデザイナーと一緒に仕事をして いる場合、開発者の中には、テンプレートエンジンを使用したい人も いると思います。

Important

テンプレートパーサクラスは、本格的なテンプレート解析ソリューション ではありません。 私達は、パフォーマンス最大化のために、これを非常にスマート にしています。

テンプレートパーサクラスの使い方

クラスの初期化

Like most other classes in CodeIgniter, the Parser class is initialized in your controller using the $this->load->library() method:

$this->load->library('parser');

Once loaded, the Parser library object will be available using: $this->parser

テンプレートを解析すること

You can use the parse() method to parse (or render) simple templates, like this:

$data = array(
        'blog_title' => 'My Blog Title',
        'blog_heading' => 'My Blog Heading'
);

$this->parser->parse('blog_template', $data);

The first parameter contains the name of the view file (in this example the file would be called blog_template.php), and the second parameter contains an associative array of data to be replaced in the template. In the above example, the template would contain two variables: {blog_title} and {blog_heading}

There is no need to “echo” or do something with the data returned by $this->parser->parse(). It is automatically passed to the output class to be sent to the browser. However, if you do want the data returned instead of sent to the output class you can pass TRUE (boolean) as the third parameter:

$string = $this->parser->parse('blog_template', $data, TRUE);

ペアの擬似変数

The above example code allows simple variables to be replaced. What if you would like an entire block of variables to be repeated, with each iteration containing new values? Consider the template example we showed at the top of the page:

<html>
        <head>
                <title>{blog_title}</title>
        </head>
        <body>
                <h3>{blog_heading}</h3>

        {blog_entries}
                <h5>{title}</h5>
                <p>{body}</p>
        {/blog_entries}

        </body>
</html>

In the above code you’ll notice a pair of variables: {blog_entries} data... {/blog_entries}. In a case like this, the entire chunk of data between these pairs would be repeated multiple times, corresponding to the number of rows in the “blog_entries” element of the parameters array.

Parsing variable pairs is done using the identical code shown above to parse single variables, except, you will add a multi-dimensional array corresponding to your variable pair data. Consider this example:

$this->load->library('parser');

$data = array(
        'blog_title'   => 'My Blog Title',
        'blog_heading' => 'My Blog Heading',
        'blog_entries' => array(
                array('title' => 'Title 1', 'body' => 'Body 1'),
                array('title' => 'Title 2', 'body' => 'Body 2'),
                array('title' => 'Title 3', 'body' => 'Body 3'),
                array('title' => 'Title 4', 'body' => 'Body 4'),
                array('title' => 'Title 5', 'body' => 'Body 5')
        )
);

$this->parser->parse('blog_template', $data);

If your “pair” data is coming from a database result, which is already a multi-dimensional array, you can simply use the database result_array() method:

$query = $this->db->query("SELECT * FROM blog");

$this->load->library('parser');

$data = array(
        'blog_title'   => 'My Blog Title',
        'blog_heading' => 'My Blog Heading',
        'blog_entries' => $query->result_array()
);

$this->parser->parse('blog_template', $data);

使用メモ

If you include substitution parameters that are not referenced in your template, they are ignored:

$template = 'Hello, {firstname} {lastname}';
$data = array(
        'title' => 'Mr',
        'firstname' => 'John',
        'lastname' => 'Doe'
);
$this->parser->parse_string($template, $data);

// Result: Hello, John Doe

If you do not include a substitution parameter that is referenced in your template, the original pseudo-variable is shown in the result:

$template = 'Hello, {firstname} {initials} {lastname}';
$data = array(
        'title' => 'Mr',
        'firstname' => 'John',
        'lastname' => 'Doe'
);
$this->parser->parse_string($template, $data);

// Result: Hello, John {initials} Doe

If you provide a string substitution parameter when an array is expected, i.e. for a variable pair, the substitution is done for the opening variable pair tag, but the closing variable pair tag is not rendered properly:

$template = 'Hello, {firstname} {lastname} ({degrees}{degree} {/degrees})';
$data = array(
        'degrees' => 'Mr',
        'firstname' => 'John',
        'lastname' => 'Doe',
        'titles' => array(
                array('degree' => 'BSc'),
                array('degree' => 'PhD')
        )
);
$this->parser->parse_string($template, $data);

// Result: Hello, John Doe (Mr{degree} {/degrees})

If you name one of your individual substitution parameters the same as one used inside a variable pair, the results may not be as expected:

$template = 'Hello, {firstname} {lastname} ({degrees}{degree} {/degrees})';
$data = array(
        'degree' => 'Mr',
        'firstname' => 'John',
        'lastname' => 'Doe',
        'degrees' => array(
                array('degree' => 'BSc'),
                array('degree' => 'PhD')
        )
);
$this->parser->parse_string($template, $data);

// Result: Hello, John Doe (Mr Mr )

ビューフラグメント

You do not have to use variable pairs to get the effect of iteration in your views. It is possible to use a view fragment for what would be inside a variable pair, and to control the iteration in your controller instead of in the view.

An example with the iteration controlled in the view:

$template = '<ul>{menuitems}
        <li><a href="{link}">{title}</a></li>
{/menuitems}</ul>';

$data = array(
        'menuitems' => array(
                array('title' => 'First Link', 'link' => '/first'),
                array('title' => 'Second Link', 'link' => '/second'),
        )
);
$this->parser->parse_string($template, $data);

Result:

<ul>
        <li><a href="/first">First Link</a></li>
        <li><a href="/second">Second Link</a></li>
</ul>

An example with the iteration controlled in the controller, using a view fragment:

$temp = '';
$template1 = '<li><a href="{link}">{title}</a></li>';
$data1 = array(
        array('title' => 'First Link', 'link' => '/first'),
        array('title' => 'Second Link', 'link' => '/second'),
);

foreach ($data1 as $menuitem)
{
        $temp .= $this->parser->parse_string($template1, $menuitem, TRUE);
}

$template = '<ul>{menuitems}</ul>';
$data = array(
        'menuitems' => $temp
);
$this->parser->parse_string($template, $data);

Result:

<ul>
        <li><a href="/first">First Link</a></li>
        <li><a href="/second">Second Link</a></li>
</ul>

クラスリファレンス

class CI_Parser
parse($template, $data[, $return = FALSE])
Parameters:
  • $template (string) – Path to view file
  • $data (array) – Variable data
  • $return (bool) – Whether to only return the parsed template
Returns:

Parsed template string

Return type:

string

Parses a template from the provided path and variables.

parse_string($template, $data[, $return = FALSE])
Parameters:
  • $template (string) – Path to view file
  • $data (array) – Variable data
  • $return (bool) – Whether to only return the parsed template
Returns:

Parsed template string

Return type:

string

This method works exactly like parse(), only it accepts the template as a string instead of loading a view file.

set_delimiters([$l = '{'[, $r = '}']])
Parameters:
  • $l (string) – Left delimiter
  • $r (string) – Right delimiter
Return type:

void

Sets the delimiters (opening and closing) for a pseudo-variable “tag” in a template.