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Diffstat (limited to 'user_guide_src/source/libraries/parser.rst')
| -rw-r--r-- | user_guide_src/source/libraries/parser.rst | 202 |
1 files changed, 104 insertions, 98 deletions
diff --git a/user_guide_src/source/libraries/parser.rst b/user_guide_src/source/libraries/parser.rst index e7c7e3abd..d66684d9b 100644 --- a/user_guide_src/source/libraries/parser.rst +++ b/user_guide_src/source/libraries/parser.rst @@ -10,18 +10,18 @@ If you've never used a template engine, pseudo-variable names are enclosed in braces, like this:: <html> - <head> - <title>{blog_title}</title> - </head> - <body> - - <h3>{blog_heading}</h3> - - {blog_entries} - <h5>{title}</h5> - <p>{body}</p> - {/blog_entries} - </body> + <head> + <title>{blog_title}</title> + </head> + <body> + <h3>{blog_heading}</h3> + + {blog_entries} + <h5>{title}</h5> + <p>{body}</p> + {/blog_entries} + + </body> </html> These variables are not actual PHP variables, but rather plain text @@ -30,8 +30,8 @@ representations that allow you to eliminate PHP from your templates .. note:: CodeIgniter does **not** require you to use this class since using pure PHP in your view pages lets them run a little faster. - However, some developers prefer to use a template engine if - they work with designers who they feel would find some + However, some developers prefer to use a template engine if + they work with designers who they feel would find some confusion working with PHP. .. important:: The Template Parser Class is **not** a full-blown @@ -53,7 +53,7 @@ Initializing the Class ====================== Like most other classes in CodeIgniter, the Parser class is initialized -in your controller using the $this->load->library function:: +in your controller using the ``$this->load->library()`` method:: $this->load->library('parser'); @@ -63,12 +63,12 @@ $this->parser Parsing templates ================= -You can use the ``parse()`` method to parse (or render) simple templates, +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' + 'blog_title' => 'My Blog Title', + 'blog_heading' => 'My Blog Heading' ); $this->parser->parse('blog_template', $data); @@ -96,18 +96,18 @@ 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> + <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} @@ -122,31 +122,31 @@ 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') - ) + '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() -function:: +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() + 'blog_title' => 'My Blog Title', + 'blog_heading' => 'My Blog Heading', + 'blog_entries' => $query->result_array() ); $this->parser->parse('blog_template', $data); @@ -154,94 +154,95 @@ function:: Usage Notes =========== -If you include substitution parameters that are not referenced in your +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' + 'title' => 'Mr', + 'firstname' => 'John', + 'lastname' => 'Doe' ); $this->parser->parse_string($template, $data); - Result: Hello, John Doe + // Result: Hello, John Doe -If you do not include a substitution parameter that is referenced in your +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' + 'title' => 'Mr', + 'firstname' => 'John', + 'lastname' => 'Doe' ); $this->parser->parse_string($template, $data); - Result: Hello, John {initials} Doe + // Result: Hello, John {initials} Doe -If you provide a string substitution parameter when an array is expected, +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') - - ) + '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}) + // 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:: +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') - - ) + '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 ) + // Result: Hello, John Doe (Mr Mr ) View Fragments ============== -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 +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>'; + <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'), - ) + 'menuitems' => array( + array('title' => 'First Link', 'link' => '/first'), + array('title' => 'Second Link', 'link' => '/second'), + ) ); $this->parser->parse_string($template, $data); - Result: - - First Link - - Second Link +Result:: + + <ul> + <li><a href="/first">First Link</a></li> + <li><a href="/second">Second Link</a></li> + </ul> An example with the iteration controlled in the controller, using a view fragment:: @@ -252,19 +253,24 @@ using a view fragment:: array('title' => 'First Link', 'link' => '/first'), array('title' => 'Second Link', 'link' => '/second'), ); - foreach ($data1 as $menuitem) { - $temp .= $this->parser->parse_string($template1, $menuitem, TRUE); + + foreach ($data1 as $menuitem) + { + $temp .= $this->parser->parse_string($template1, $menuitem, TRUE); } $template = '<ul>{menuitems}</ul>'; $data = array( - 'menuitems' => $temp + 'menuitems' => $temp ); $this->parser->parse_string($template, $data); - Result: - - First Link - - Second Link +Result:: + + <ul> + <li><a href="/first">First Link</a></li> + <li><a href="/second">Second Link</a></li> + </ul> *************** Class Reference @@ -290,8 +296,8 @@ Class Reference :returns: Parsed template string :rtype: string - This method works exactly like ``parse()``, only it accepts - the template as a string instead of loading a view file. + This method works exactly like ``parse()``, only it accepts + the template as a string instead of loading a view file. .. method:: set_delimiters([$l = '{'[, $r = '}']]) @@ -299,5 +305,5 @@ Class Reference :param string $r: Right delimiter :rtype: void - Sets the delimiters (opening and closing) for a - pseudo-variable "tag" in a template.
\ No newline at end of file + Sets the delimiters (opening and closing) for a + pseudo-variable "tag" in a template.
\ No newline at end of file |