I don't understand the logic behind the way template engines parse loop, statements and that sort of stuff. I mean template engines other then a PHP template engine.
Doing this to learn PHP better mainly, and I've always wanted to see if I could.
Here's what I've tried:
Let's say I have the following in my template file:
<if>$variable != true</if>
// My Code
<elseif>$variable == 'apples'</elseif>
// My Code
</endif>
To parse that, I've tried the following variants:
<?php
$contents = preg_replace("/\<if\>(.*)\<\/if\>/", "<?php if($1) {", $contents);
$contents = preg_replace("/\<elseif\>(.*)\<\/elseif\>/", "} elseif($1) {", $contents);
$contents = str_replace("</endif>", "} ?>", $contents);
$contents = eval($contents);
?>
Which if I echo before I eval it, I get the following:
<?php if($variable != true) {
// My Code
} elseif($variable == 'apples') {
// My Code
} ?>
And after I eval, I get the following error:
Parse error: syntax error, unexpected '<' in C:\xampp\htdocs\www\hmvc\includes\template_engine.php(84) : eval()'d code on line 1
The entire page I'm trying to eval, looks like:
<html>
<head>
<title>Test View Template Engine</title>
</head>
<body>
<p>This is test, huh? My Title</p>
<p>Testing the test</p>
<?php if($variable != true) {
// My Code
} elseif($variable == 'apples') {
// My Code
} ?>
</body>
</html>
I've also tried the following variant:
$match = array();
preg_match_all("/\<if\>(.*)\<\/if\>/", $contents, $match[1]);
preg_match_all("/\<\/if\>(.*)\<elseif\>/", $contents, $match[2]);
preg_match_all("/\<elseif\>(.*)\<\/elseif\>/", $contents, $match[3]);
preg_match_all("/\<\/elseif\>(.*)\<\/endif\>/", $contents, $match[4]);
print_r($match);
Which gives me the following array:
Array
(
[1] => Array
(
[0] => Array
(
[0] => <if>$variable != true</if>
)
[1] => Array
(
[0] => $variable != true
)
)
[2] => Array
(
[0] => Array
(
)
[1] => Array
(
)
)
[3] => Array
(
[0] => Array
(
[0] => <elseif>$variable == 'apples'</elseif>
)
[1] => Array
(
[0] => $variable == 'apples'
)
)
[4] => Array
(
[0] => Array
(
)
[1] => Array
(
)
)
)
For some reason the preg_match_all is not finding the stuff between </endif> and </elseif> and between <elseif> and </if>...
Thanks for any productive comments/help. Good day!
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