Add support for nested if conditions (#6829)

* add support for nested if conditions
* add tests for condition parsing in templates
* make [space][slash] ending of condition objects optional (#6954)

program/include/rcmail_output_html.php

@@ -1048,32 +1048,45 @@ EOF;
      */
     protected function parse_conditions($input)
     {
-        $matches = preg_split('/<roundcube:(if|elseif|else|endif)\s+([^>]+)>\n?/is', $input, 2, PREG_SPLIT_DELIM_CAPTURE);
+        while (preg_match('/<roundcube:if\s+[^>]+>(((?!<roundcube:(if|endif)).)*)<roundcube:endif[^>]*>/is', $input, $conditions)) {
+            $result = $this->eval_condition($conditions[0]);
+            $input = str_replace($conditions[0], $result, $input);
+        }
+
+        return $input;
+    }
+
+    /**
+     * Process & evaluate conditional tags
+     */
+    protected function eval_condition($input)
+    {
+        $matches = preg_split('/<roundcube:(if|elseif|else|endif)\s*([^>]*)>\n?/is', $input, 2, PREG_SPLIT_DELIM_CAPTURE);
         if ($matches && count($matches) == 4) {
             if (preg_match('/^(else|endif)$/i', $matches[1])) {
-                return $matches[0] . $this->parse_conditions($matches[3]);
+                return $matches[0] . $this->eval_condition($matches[3]);
             }
 
             $attrib = html::parse_attrib_string($matches[2]);
 
             if (isset($attrib['condition'])) {
-                $condmet    = $this->check_condition($attrib['condition']);
-                $submatches = preg_split('/<roundcube:(elseif|else|endif)\s+([^>]+)>\n?/is', $matches[3], 2, PREG_SPLIT_DELIM_CAPTURE);
+                $condmet   = $this->check_condition($attrib['condition']);
+                $condparts = preg_split('/<roundcube:((elseif|else|endif)[^>]*)>\n?/is', $matches[3], 2, PREG_SPLIT_DELIM_CAPTURE);
 
                 if ($condmet) {
-                    $result = $submatches[0];
-                    if ($submatches[1] != 'endif') {
-                        $result .= preg_replace('/.*<roundcube:endif\s+[^>]+>\n?/Uis', '', $submatches[3], 1);
+                    $result = $condparts[0];
+                    if ($condparts[2] != 'endif') {
+                        $result .= preg_replace('/.*<roundcube:endif[^>]*>\n?/Uis', '', $condparts[3], 1);
                     }
                     else {
-                        $result .= $submatches[3];
+                        $result .= $condparts[3];
                     }
                 }
                 else {
-                    $result = "<roundcube:$submatches[1] $submatches[2]>" . $submatches[3];
+                    $result = "<roundcube:$condparts[1]>" . $condparts[3];
                 }
 
-                return $matches[0] . $this->parse_conditions($result);
+                return $matches[0] . $this->eval_condition($result);
             }
 
             rcube::raise_error(array(

tests/Rcmail/OutputHtml.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Test class to test rcmail_output_html class
  *
@@ -144,4 +145,36 @@ class Rcmail_OutputHtml extends PHPUnit\Framework\TestCase
         $result = $get_template_logo->invokeArgs($output, array());
         $this->assertSame('img16', $result);
     }
+
+    /**
+     * Data for test_conditions()
+     */
+    function data_conditions()
+    {
+        return array(
+            array("_start_<roundcube:if condition='1' />A<roundcube:endif />_end_", "_start_A_end_"),
+            array("_start_<roundcube:if condition='0' />A<roundcube:else />B<roundcube:endif />_end_", "_start_B_end_"),
+            array("_start_<roundcube:if condition='0'/>A<roundcube:else/>B<roundcube:endif/>_end_", "_start_B_end_"),
+            array("_start_<roundcube:if condition='0'>A<roundcube:else>B<roundcube:endif>_end_", "_start_B_end_"),
+            array("_start_<roundcube:if condition='0' />A<roundcube:elseif condition='1' />B<roundcube:else />C<roundcube:endif />_end_", "_start_B_end_"),
+            array("_start_<roundcube:if condition='1' /><roundcube:if condition='0' />A<roundcube:else />B<roundcube:endif />C<roundcube:else />D<roundcube:endif />_end_", "_start_BC_end_"),
+            array("_start_<roundcube:if condition='1' /><roundcube:if condition='1' />A<roundcube:else />B<roundcube:endif />C<roundcube:else />D<roundcube:endif />_end_", "_start_AC_end_"),
+            array("_start_<roundcube:if condition='1' /><roundcube:if condition='0' />A<roundcube:elseif condition='1' />B<roundcube:else />C<roundcube:endif />D<roundcube:else />E<roundcube:endif />_end_", "_start_BD_end_"),
+            array("_start_<roundcube:if condition='0' />A<roundcube:elseif condition='1' /><roundcube:if condition='0' />B<roundcube:else /><roundcube:if condition='1' />C<roundcube:endif />D<roundcube:endif /><roundcube:else />E<roundcube:endif />_end_", "_start_CD_end_"),
+            array("_start_<roundcube:if condition='0'>A<roundcube:elseif condition='1'><roundcube:if condition='0'>B<roundcube:else><roundcube:if condition='1'>C<roundcube:endif>D<roundcube:endif><roundcube:else>E<roundcube:endif>_end_", "_start_CD_end_")
+        );
+    }
+
+    /**
+     * Test text to html conversion
+     *
+     * @dataProvider data_conditions
+     */
+    function test_conditions($input, $output)
+    {
+        $object = new rcmail_output_html;
+        $result = $object->just_parse($input);
+
+        $this->assertEquals($output, $result);
+    }
 }