Lex PyroCMS Parser结合CodeIgniter HMVC条件语法异常问题问询

Hey there, let's work through this conditional syntax problem you're facing with the Lex PyroCMS Parser in your HMVC-enabled CodeIgniter setup. It's weird that basic loop syntax works but conditions break—let's break down the likely causes and fixes:

1. Double-Check Your Lex Conditional Syntax #

First, make sure you're following Lex's exact conditional formatting rules. Tiny syntax mistakes are the most common culprit here. For example, your conditional should look like this (note the spaces around operators and proper tag closure):

{{modules}}
  {{if name_mdl == 'users'}}
    ✅ This is the users module!
  {{else}}
    📦 Module: {{name_mdl}}
  {{/if}}
{{/modules}}

• Ensure you're using single or double quotes around string values (no unquoted strings for comparisons).
• Verify all opening {{if}} tags have a matching {{/if}} (or {{else}}/{{elseif}}).
• Don't skip spaces around operators (e.g., == instead of ==—yes, that matters in Lex).

2. Confirm Variable Structure & Scope #

Since your basic loop works, we know $modules is being passed correctly, but let's double-check the inner array keys. Run a var_dump($modules) instead of print_r() to get precise data:

var_dump($modules);

You should see something like this (confirm the key is exactly name_mdl—it's case-sensitive!):

array(2) {
  [0]=> array(1) { ["name_mdl"]=> string(5) "users" }
  [1]=> array(1) { ["name_mdl"]=> string(7) "actions" }
}

If the key is named differently (like module_name or name), your condition will fail silently. Also, in HMVC, make sure variables from your module controllers are being passed up to the main view context correctly—avoid nested variable scopes that Lex can't access.

3. Verify Lex Parser Configuration #

Check your CodeIgniter Lex config file (usually application/config/lex.php) to ensure conditional support is enabled. Look for this line:

$config['enable_conditions'] = true;

If it's set to false, conditional syntax won't be parsed at all—this is a common default oversight. While you're there, confirm no other config settings are restricting syntax features (like allowed_syntax if it's defined).

4. Test a Minimal Conditional to Isolate the Issue #

Strip down your template to the simplest possible condition to rule out complex logic conflicts:

{{modules}}
  {{if name_mdl}}
    {{name_mdl}} is present!
  {{/if}}
{{/modules}}

If this works, the problem is likely with your comparison operator or string matching. If it still fails, there's a deeper issue with variable access or Lex's parsing context.

5. Debug Direct Lex Parsing #

Bypass the view loader entirely to test if Lex itself can handle the condition. In your controller, run this quick test:

$this->load->library('lex');
$test_template = '{{modules}}{{if name_mdl == "users"}}Users Module{{else}}{{name_mdl}}{{/if}}{{/modules}}';
$parsed = $this->lex->parse($test_template, array('modules' => $modules));
echo $parsed;

• If this outputs correctly: The problem is in your HMVC view loading workflow (variables aren't being passed to the view's Lex parser context).
• If this fails: Your Lex installation might be outdated or corrupted. Try updating via Composer:

  composer update pyrocms/lex
  

6. Rule Out Tag Conflicts #

CodeIgniter has its own native template tags (like {php} or {echo}) that might clash with Lex's {{ }} syntax. Try temporarily changing Lex's tag delimiters in the config to see if that fixes it:

$config['tag_prefix'] = '{%';
$config['tag_suffix'] = '%}';

Then update your template to use {%modules%} and {%if name_mdl == 'users'%}—if this works, you had a tag conflict.

内容的提问来源于stack exchange，提问作者Renard Masque