Core compatibility with ILIAS: Add helpers for platform-specific paths and input rendering

doc/content/stack.bib

@@ -221,6 +221,100 @@ @article{Kinnear2022
   keywords = {computer-aided assessment,Course design,online and blended learning,specifications grading,university mathematics},
 }
 
+@article{Cameron2024,
+  title = {Designing a Blended Delivery Foundation Mathematics Course: {{Targeting}} Self-Efficacy, Skill Development and Social Connectedness},
+  shorttitle = {Designing a Blended Delivery Foundation Mathematics Course},
+  author = {Cameron, Rosie A.},
+  year = 2024,
+  month = jan,
+  journal = {MSOR Connections},
+  volume = {22},
+  number = {1},
+  pages = {29--41},
+  issn = {2051-4220},
+  doi = {10.21100/msor.v22i1.1451},
+}
+
+@article{Cameron2025,
+  title = {`{{The}} Green Tick': How Instant Feedback Shaped Self-Efficacy in a First-Year Mathematics Course},
+  shorttitle = {`{{The}} Green Tick'},
+  author = {Cameron, Rosie A.},
+  year = 2025,
+  journal = {International Journal of Mathematical Education in Science and Technology},
+  pages = {1--17},
+  publisher = {Taylor \& Francis},
+  issn = {0020-739X},
+  doi = {10.1080/0020739X.2025.2574947},
+}
+
+@article{Gratwick2023,
+  title = {Using Online {{STACK}} Assessment to Teach Complex Analysis: A Prototype Course Design?},
+  shorttitle = {Using Online {{STACK}} Assessment to Teach Complex Analysis},
+  author = {Gratwick, Richard and O'Hagan, Steven},
+  year = 2023,
+  month = mar,
+  journal = {MSOR Connections},
+  volume = {21},
+  number = {1},
+  pages = {58--64},
+  issn = {2051-4220},
+  doi = {10.21100/msor.v21i1.1394},
+}
+
+@article{Lowe2026,
+  title = {A Decade of Computer-Algebra-Aided Online Assessment of Mathematics at the {{UK Open University}}},
+  author = {Lowe, Tim and Hunt, Tim},
+  year = 2026,
+  month = mar,
+  journal = {Teaching Mathematics and its Applications: An International Journal of the IMA},
+  volume = {45},
+  number = {1},
+  pages = {1--18},
+  issn = {0268-3679, 1471-6976},
+  doi = {10.1093/teamat/hraf021},
+}
+
+@article{Wallace2026,
+  title = {Students Writing {{STACK}} Questions: E-Assessment as the Focus of a Final-Year Project},
+  shorttitle = {Students Writing {{STACK}} Questions},
+  author = {Wallace, Clare and Fearn, Sam},
+  year = 2026,
+  month = mar,
+  journal = {Teaching Mathematics and Its Applications},
+  volume = {45},
+  number = {1},
+  pages = {124--138},
+  issn = {0268-3679, 1471-6976},
+  doi = {10.1093/teamat/hrag006},
+}
+
+@article{Chelleri2025,
+  title = {Assessing Student Perspectives on {{STACK}} Implementation in University Mathematics Courses},
+  author = {Chelleri, Elisabetta and Doz, Daniel and Juma, Zevick Otieno and {d'Assise Dogbalou}, Motognon Wastalas and Lewa{\'n}ski, Danilo},
+  year = 2025,
+  month = oct,
+  journal = {International Journal of Mathematical Education in Science and Technology},
+  pages = {1--32},
+  issn = {0020-739X, 1464-5211},
+  doi = {10.1080/0020739X.2025.2563115},
+}
+
+@article{Doz2026,
+  title = {Latent Class Analysis of Student Attitudes and Performance in Online Mathematics Assessments: A {{Technology Acceptance Model}} Approach},
+  shorttitle = {Latent Class Analysis of Student Attitudes and Performance in Online Mathematics Assessments},
+  author = {Doz, Daniel and {d'Assise Dogbalou}, Motognon Wastalas and Juma, Zevick Otieno and Lewa{\'n}ski, Danilo},
+  year = 2026,
+  month = may,
+  journal = {International Journal of Mathematical Education in Science and Technology},
+  volume = {57},
+  number = {5},
+  pages = {944--966},
+  issn = {0020-739X, 1464-5211},
+  doi = {10.1080/0020739X.2025.2502859},
+}
+
+
+
 
 @INPROCEEDINGS{WebALT2006,
   author  =      {Sangwin, C.~J. and Grove, M.~J.},
@@ -256,7 +350,7 @@ @INPROCEEDINGS{Sangwin2012ICME
 }
 
 @INPROCEEDINGS{Sangwin2013HEA,
-  AUTHOR =       {Butcher, P. and Sangwin, C.~. and Hunt, T.},
+  AUTHOR =       {Butcher, P. and Sangwin, C. and Hunt, T.},
   TITLE =        {Embedding and enhancing eAssessment in the leading open source {VLE}},
   BOOKTITLE    = {Proceedings of the Higher Education Academy Conference, Birmingham},
   YEAR =         {2013},
@@ -395,6 +489,52 @@ @MASTERSTHESIS{CervalPena2008
 
 % More general research about online assessment, in which STACK played a significant part.
 
+@incollection{Iannone2026,
+  title = {The Transfer of Assessment from Pen and Paper to E-Assessment: {{Two}} Case Studies from One Theoretical Perspective},
+  shorttitle = {The Transfer of Assessment from Pen and Paper to E-Assessment},
+  booktitle = {Digital {{Technology}} and {{Artificial Intelligence}} in {{Mathematics Education Assessment}}},
+  author = {Iannone, Paola and Lemmo, Alice and Kinnear, George},
+  editor = {Geraniou, Eirini and Crisan, Cosette and Mavrikis, Manolis},
+  year = 2026,
+  publisher = {Routledge},
+  doi = {10.4324/9781003533764-2},
+}
+@incollection{Pinkernell2026a,
+  title = {Adaptive Feedback and (Digital) Assessment of Conceptual Knowledge},
+  booktitle = {Digital {{Technology}} and {{Artificial Intelligence}} in {{Mathematics Education Assessment}}},
+  author = {Pinkernell, Guido and Weigand, Hans-Georg},
+  editor = {Geraniou, Eirini and Crisan, Cosette and Mavrikis, Manolis},
+  year = 2026,
+  publisher = {Routledge},
+  doi = {10.4324/9781003533764-6},
+}
+
+@incollection{Sangwin2026a,
+  title = {Using Computer Algebra to Support Automatic Assessment of Mathematics},
+  booktitle = {Digital {{Technology}} and {{Artificial Intelligence}} in {{Mathematics Education Assessment}}},
+  author = {Sangwin, Christopher and Oyengo, Michael O.},
+  editor = {Geraniou, Eirini and Crisan, Cosette and Mavrikis, Manolis},
+  year = 2026,
+  publisher = {Routledge},
+  doi = {10.4324/9781003533764-12},
+}
+
+
+@article{Kontorovich2023b,
+  title = {When Learning Stumbles upon Identity and Affect: A Loaded Student--Student Collaboration in Linear Algebra},
+  shorttitle = {When Learning Stumbles upon Identity and Affect},
+  author = {Kontorovich, Igor'},
+  year = 2023,
+  month = sep,
+  journal = {International Journal of Mathematical Education in Science and Technology},
+  volume = {54},
+  number = {8},
+  pages = {1526--1540},
+  publisher = {Taylor \& Francis},
+  issn = {0020-739X},
+  doi = {10.1080/0020739X.2023.2173102},
+}
+
 @inproceedings{KinnearIannone2024PME,
   title = {Students' Views of e-Assessment Feedback in Undergraduate Mathematics},
   booktitle = {Proceedings of the 47th {{Conference}} of the {{International Group}} for the {{Psychology}} of {{Mathematics Education}}},

doc/content/stack_publications.tex

@@ -63,15 +63,19 @@ \section{Theses}
 \printbibliography[heading=none]
 
 \section{Research and conference papers}
-\nocite{Gratwick2020,Akveld2024,2018Mastery,Yoshitomi2018,Barbas2016,Nakamura2016,Sangwin2015KHDM}
+\nocite{Gratwick2020,Gratwick2023,Akveld2024,2018Mastery,Yoshitomi2018,Barbas2016,Nakamura2016,Sangwin2015KHDM}
 \nocite{Rasila2016,Rasila2016b,Rasila2016c}
 \nocite{Shirai2015a,Shirai2015b,Pavia2015,Nakamura2014,Shirai2014,Nakamura2013}
 \nocite{Sangwin2012ICME,Sangwin2013HEA,Lowe2010,Sangwin2009Equality,Sangwin2010IGI,Nakamura2010b}
 \nocite{Rasila2010,Sangwin2009Calculumus,Sangwin2009ICMI,Rasila2007}
 \nocite{Sangwin2006CASAlgebra,WebALT2006,Sangwin2006UniServe,SangwinTMA03,SangwinHSkills02}
-\nocite{lowe_mestel_2019,erskine_mestel_2018,Paiva2017}
-\nocite{Kinnear2022,Kinnear2022,Kontorovich2023,Kinnear2023CERME,Kinnear2024RME,Akveld2024,KinnearIannone2024PME}
+\nocite{lowe_mestel_2019,erskine_mestel_2018,Lowe2026,Paiva2017}
+\nocite{Kinnear2022,Kinnear2022,Kontorovich2023,Kontorovich2023b,Kinnear2023CERME,Kinnear2024RME,Akveld2024,KinnearIannone2024PME}
 \nocite{Kinnear2024FAME,Razeghpour2024FAME,Taha2024FAME}
+\nocite{Iannone2026,Pinkernell2026a,Sangwin2026a}
+\nocite{Chelleri2025,Doz2026}
+\nocite{Wallace2026}
+\nocite{Cameron2024,Cameron2025}
 \printbibliography[heading=none]
 
 \section{Proceedings of the first STACK conference, 2018}

locallib.php

@@ -310,3 +310,21 @@ function get_latest_question_version($questionid) {
     $result = reset($result);
     return [$result->version, $result->questionid, $result->questionbankentryid, $versions];
 }
+
+/**
+ * Get the base URL for the plot.php script.
+ * @return string
+ */
+function stack_plot_url_base() {
+    global $CFG;
+    return $CFG->wwwroot . '/question/type/stack/plot.php/';
+}
+
+/**
+ * Get the directory path for the corsscripts directory.
+ * @return string
+ */
+function stack_cors_scripts_dir() {
+    global $CFG;
+    return $CFG->dirroot . '/question/type/stack/corsscripts/';
+}

stack/cas/castext2/blocks/jsxgraph.block.php

@@ -355,10 +355,7 @@ public function validate(
             ) {
                 $valid    = false;
                 $err[] = stack_string('stackBlock_jsxgraph_unknown_style', ['style' => $stylename]);
-            } else if (
-                !file_exists($CFG->dirroot . '/question/type/stack/corsscripts/jsxgraphstyles/' .
-                    $stylename . '.css')
-            ) {
+            } else if (!file_exists(stack_cors_scripts_dir() . 'jsxgraphstyles/' . $stylename . '.css')) {
                 $valid    = false;
                 $err[] = stack_string('stackBlock_jsxgraph_unknown_style', ['style' => $stylename]);
             }

stack/cas/castext2/blocks/parsons.block.php

@@ -584,10 +584,7 @@ public function validate(
             ) {
                 $valid    = false;
                 $err[] = stack_string('stackBlock_parsons_unknown_style', ['style' => $stylename]);
-            } else if (
-                    !file_exists($CFG->dirroot . '/question/type/stack/corsscripts/parsonsstyles/' .
-                    $stylename . '.min.css')
-            ) {
+            } else if (!file_exists(stack_cors_scripts_dir() . 'parsonsstyles/' . $stylename . '.min.css')) {
                 $valid    = false;
                 $err[] = stack_string('stackBlock_parsons_unknown_style', ['style' => $stylename]);
             }

stack/cas/connector.dbcache.class.php

@@ -52,9 +52,10 @@ public function compute($command) {
             // @codingStandardsIgnoreEnd
             if (!stack_connection_helper::check_stackmaxima_version($cached->result)) {
                 stack_connection_helper::warn_about_version_mismatch($this->debug);
-                // We could consider automatically purging the cache here.
+                $this->delete_cached_result($cached->key);
+            } else {
+                return $cached->result;
             }
-            return $cached->result;
         }
         $this->debug->log('Maxima command not found in the cache. Using the raw connection.');
         $result = $this->rawconnection->compute($command);
@@ -78,7 +79,12 @@ public function json_compute($command): array {
             // @codingStandardsIgnoreStart
             $this->debug->log('Unpacked result found in the DB cache', print_r($cached->result, true));
             // @codingStandardsIgnoreEnd
-            return $cached->result;
+            if (!$this->check_json_stackmaxima_version($cached->result)) {
+                stack_connection_helper::warn_about_version_mismatch($this->debug);
+                $this->delete_cached_result($cached->key);
+            } else {
+                return $cached->result;
+            }
         }
         $this->debug->log('Maxima command not found in the cache. Using the raw connection.');
         $this->debug->log('Maxima command', $command);
@@ -160,6 +166,28 @@ protected function add_to_cache($command, $result, $key = null) {
         $this->db->insert_record('qtype_stack_cas_cache', $data);
     }
 
+    /**
+     * Delete a cached result by cache key.
+     * @param string $key the cache key to delete.
+     */
+    protected function delete_cached_result($key) {
+        $this->db->delete_records('qtype_stack_cas_cache', ['hash' => $key]);
+    }
+
+    /**
+     * Check version information in JSON CAS session results.
+     * @param array $result the JSON result from Maxima.
+     * @return bool whether the cached result used compatible STACK-Maxima libraries.
+     */
+    protected function check_json_stackmaxima_version($result) {
+        if (!array_key_exists('values', $result) || !is_array($result['values']) ||
+                !array_key_exists('__stackmaximaversion', $result['values'])) {
+            return true;
+        }
+
+        return stack_utils::get_config()->stackmaximaversion === $result['values']['__stackmaximaversion'];
+    }
+
     /**
      * Add description here
      * @param string $command Maxima code to execute.

stack/input/equiv/equiv.class.php

@@ -620,7 +620,7 @@ public function render_validation(stack_input_state $state, $fieldname, $lang =
 
         if (self::INVALID == $state->status) {
             $feedback .= html_writer::tag(
-                'span',
+                defined('MOODLE_INTERNAL') ? 'span' : 'div',
                 stack_string('studentValidation_invalidAnswer'),
                 ['class' => 'alert alert-danger stackinputerror']
             );

stack/input/inputbase.class.php

@@ -1790,7 +1790,7 @@ public function maxima_to_response_array($in) {
      * This function is responsible for removing the validation tags from the question stem and replacing
      * them with the validation feedback.  Only the equiv input type currently does anything different here.
      */
-    public function replace_validation_tags($state, $fieldname, $questiontext) {
+    public function replace_validation_tags($state, $fieldname, $questiontext, $custom_validation = null) {
 
         $name = $this->name;
         // ISS879 Set language override to null as we should be in the question render here. It's only
@@ -1807,6 +1807,10 @@ public function replace_validation_tags($state, $fieldname, $questiontext) {
             $class = "stackinputfeedback compact";
         }
 
+        if ($custom_validation !== null) {
+            $feedback = $custom_validation;
+        }
+
         if (!$feedback) {
             $class .= ' empty';
         }
@@ -1898,4 +1902,8 @@ public function get_api_solution($tavalue) {
     public function get_api_solution_render($tadisplay, $ta) {
         return $tadisplay;
     }
+
+    public function get_name(): string {
+        return $this->name;
+    }
 }

stack/questionlibrary.class.php

@@ -120,7 +120,7 @@ public static function render_question(object $question): string {
         }
 
         foreach ($plots as $original => $new) {
-            $questiontext = str_replace($original, $CFG->wwwroot . '/question/type/stack/plot.php/' . $new, $questiontext);
+            $questiontext = str_replace($original, stack_plot_url_base() . $new, $questiontext);
         }
 
         $formatoptions = new stdClass();