diff options
Diffstat (limited to 'edit_algebra_form.php')
| -rw-r--r-- | edit_algebra_form.php | 110 |
1 files changed, 60 insertions, 50 deletions
diff --git a/edit_algebra_form.php b/edit_algebra_form.php index 2f861bb..9b0be1a 100644 --- a/edit_algebra_form.php +++ b/edit_algebra_form.php @@ -29,15 +29,13 @@ require_once($CFG->dirroot . '/question/type/algebra/parser.php'); define("SYMB_QUESTION_NUMANS_START", 2); define("SYMB_QUESTION_NUMANS_ADD", 1); -// Override the default number of variables and the number to add to avoid clutter. -// Algebra questions will likely not have huge number of different variables. -define("SYMB_QUESTION_NUMVAR_START", 2); -define("SYMB_QUESTION_NUMVAR_ADD", 1); - /** * symoblic editing form definition. */ class qtype_algebra_edit_form extends question_edit_form { + /** @var int we always show at least this many sets of unit fields. */ + const VARIABLES_MIN_REPEATS = 1; + const VARIABLES_TO_ADD = 2; /** * Add question-type specific form fields. * @@ -112,38 +110,8 @@ class qtype_algebra_edit_form extends question_edit_form { $mform->addElement('static', 'variablesinstruct', get_string('variables', 'qtype_algebra'), get_string('filloutonevariable', 'qtype_algebra')); - $mform->closeHeaderBefore('variablesinstruct'); - // Create the array for the list of variables used in the question. - $repeated=array(); - // Create the array for the list of repeated options used by the variable subforms. - $repeatedoptions = array(); - - // Add the form elements to enter the variables. - $repeated[] =& $mform->createElement('header', 'variablehdr', get_string('variableno', 'qtype_algebra', '{no}')); - $repeated[] =& $mform->createElement('text', 'variable', get_string('variablename', 'qtype_algebra'), array('size'=>20)); - $mform->setType('variable', PARAM_RAW); - $repeated[] =& $mform->createElement('text', 'varmin', get_string('varmin', 'qtype_algebra'), array('size'=>20)); - $mform->setType('varmin', PARAM_RAW); - $repeatedoptions['varmin']['default'] = ''; - $repeated[] =& $mform->createElement('text', 'varmax', get_string('varmax', 'qtype_algebra'), array('size'=>20)); - $mform->setType('varmax', PARAM_RAW); - $repeatedoptions['varmax']['default'] = ''; - // Get the current number of variables defined, if any. - if (isset($this->question->options)) { - $countvars = count($this->question->options->variables); - } else { - $countvars = 0; - } - // Come up with the number of variable entries to add to the form at the start. - if ($this->question->formoptions->repeatelements) { - $repeatsatstart = (SYMB_QUESTION_NUMVAR_START > ($countvars + SYMB_QUESTION_NUMVAR_ADD))? - SYMB_QUESTION_NUMVAR_START : ($countvars + SYMB_QUESTION_NUMVAR_ADD); - } else { - $repeatsatstart = $countvars; - } - $this->repeat_elements($repeated, $repeatsatstart, $repeatedoptions, 'novariables', 'addvariables', - SYMB_QUESTION_NUMVAR_ADD, get_string('addmorevariableblanks', 'qtype_algebra')); + $this->add_variable_fields($mform); $mform->addElement('static', 'answersinstruct', get_string('correctanswers', 'qtype_algebra'), @@ -157,6 +125,48 @@ class qtype_algebra_edit_form extends question_edit_form { } + /** + * Add the input areas for each variable. + * @param object $mform the form being built. + */ + protected function add_variable_fields($mform) { + $mform->addElement('header', 'variablehdr', + get_string('variables', 'qtype_algebra'), ''); + $mform->setExpanded('variablehdr', 1); + + $variablefields = array($mform->createElement('group', 'variables', + get_string('variablex', 'qtype_algebra'), $this->variable_group($mform), null, false)); + + $repeatedoptions['variable']['type'] = PARAM_RAW; + $repeatedoptions['varmin']['type'] = PARAM_RAW; + $repeatedoptions['varmin']['default'] = ''; + $repeatedoptions['varmax']['type'] = PARAM_RAW; + $repeatedoptions['varmax']['default'] = ''; + + if (isset($this->question->options->variables)) { + $repeatsatstart = max(count($this->question->options->variables), self::VARIABLES_MIN_REPEATS); + } else { + $repeatsatstart = self::VARIABLES_MIN_REPEATS; + } + + $this->repeat_elements($variablefields, $repeatsatstart, $repeatedoptions, 'novariables', 'addvariables', + self::VARIABLES_TO_ADD, get_string('addmorevariableblanks', 'qtype_algebra'), true); + $mform->addHelpButton('variables[0]', 'variable', 'qtype_algebra'); + } + + /** + * Get the form fields needed to edit one variable. + * @param MoodleQuickForm $mform the form being built. + * @return array of form fields. + */ + protected function variable_group($mform) { + $grouparray = array(); + $grouparray[] = $mform->createElement('text', 'variable', get_string('variablename', 'qtype_algebra'), array('size'=>10)); + $grouparray[] = $mform->createElement('text', 'varmin', get_string('varmin', 'qtype_algebra'), array('size'=>10)); + $grouparray[] = $mform->createElement('text', 'varmax', get_string('varmax', 'qtype_algebra'), array('size'=>20)); + + return $grouparray; + } protected function get_more_choices_string() { return get_string('addmoreanswerblanks', 'qtype_algebra'); } @@ -263,17 +273,17 @@ class qtype_algebra_edit_form extends question_edit_form { $trimvar = trim($var); $trimmin = trim($data['varmin'][$key]); $trimmax = trim($data['varmax'][$key]); - // Check that there is a valid variable name otherwise skip. + // Check that there is a nom empty variable name otherwise skip. if ($trimvar == '') { continue; } // Check that this variable does not have the same name as a function. if (in_array($trimvar, qtype_algebra_parser::$functions) or in_array($trimvar, qtype_algebra_parser::$specials)) { - $errors['variable['.$key.']'] = get_string('illegalvarname', 'qtype_algebra', $trimvar); + $errors['variables['.$key.']'] = get_string('illegalvarname', 'qtype_algebra', $trimvar); } // Check that this variable has not been defined before. if (in_array($trimvar, $varlist)) { - $errors['variable['.$key.']'] = get_string('duplicatevar', 'qtype_algebra'); + $errors['variables['.$key.']'] = get_string('duplicatevar', 'qtype_algebra', $trimvar); } else { // Add the variable to the list of defined variables. $varlist[]=$trimvar; @@ -284,26 +294,26 @@ class qtype_algebra_edit_form extends question_edit_form { if ($data['compareby']=='eval') { // Check that a minimum has been defined. if ($trimmin == '') { - $errors['varmin['.$key.']'] = get_string('novarmin', 'qtype_algebra'); + $errors['variables['.$key.']'] = get_string('novarmin', 'qtype_algebra'); } else if (!preg_match($renumber, $trimmin)) { // If there is one check that it's a number. - $errors['varmin['.$key.']'] = get_string('notanumber', 'qtype_algebra'); + $errors['variables['.$key.']'] = get_string('notanumber', 'qtype_algebra'); } if ($trimmax == '') { - $errors['varmax['.$key.']'] = get_string('novarmax', 'qtype_algebra'); + $errors['variables['.$key.']'] = get_string('novarmax', 'qtype_algebra'); } else if (!preg_match($renumber, $trimmax)) { // If there is one check that it is a number. - $errors['varmax['.$key.']'] = get_string('notanumber', 'qtype_algebra'); + $errors['variables['.$key.']'] = get_string('notanumber', 'qtype_algebra'); } // Check that the minimum is less that the maximum! if ((float)$trimmin > (float)$trimmax) { - $errors['varmin['.$key.']'] = get_string('varmingtmax', 'qtype_algebra'); + $errors['variables['.$key.']'] = get_string('varmingtmax', 'qtype_algebra'); } } // End check for eval type. } // End loop over variables. // Check that at least one variable is defined. if (count($varlist)==0) { - $errors['variable[0]'] = get_string('notenoughvars', 'qtype_algebra'); + $errors['variables[0]'] = get_string('notenoughvars', 'qtype_algebra'); } // Now perform the sanity checks on the answers. @@ -333,7 +343,7 @@ class qtype_algebra_edit_form extends question_edit_form { // Do this by looking for a non-empty array to be returned from the array_diff // between the list of all declared variables and the variables in this answer. if ($d=array_diff($tmpvars, $varlist)) { - $errors['answer['.$key.']'] = get_string('undefinedvar', 'qtype_algebra', "'".implode("', '", $d)."'"); + $errors['answeroptions['.$key.']'] = get_string('undefinedvar', 'qtype_algebra', "'".implode("', '", $d)."'"); } // Do the same for functions which we did for variables. $ansfuncs=array_merge($ansfuncs, array_diff($expr->get_functions(), $ansfuncs)); @@ -347,7 +357,7 @@ class qtype_algebra_edit_form extends question_edit_form { } } } catch (Exception $e) { - $errors['answer['.$key.']']=$e->getMessage(); + $errors['answeroptions['.$key.']']=$e->getMessage(); // Return here because subsequent errors may be wrong due to not counting the answer // which just failed to parse. return $errors; @@ -355,11 +365,11 @@ class qtype_algebra_edit_form extends question_edit_form { } // Check that we have at least one answer. if ($answercount==0) { - $errors['answer[0]'] = get_string('notenoughanswers', 'quiz', 1); + $errors['answeroptions[0]'] = get_string('notenoughanswers', 'qtype_algebra'); } // Check that at least one question has the maximum possible grade. if ($maxgrade == false) { - $errors['fraction[0]'] = get_string('fractionsnomax', 'question'); + $errors['answeroptions[0]'] = get_string('fractionsnomax', 'question'); } // Check for variables which are defined but never used. @@ -370,7 +380,7 @@ class qtype_algebra_edit_form extends question_edit_form { $trimvar = trim($var); // If the variable is in the unused array then add the error message to that variable. if (in_array($trimvar, $d)) { - $errors['variable['.$key.']'] = get_string('unusedvar', 'qtype_algebra'); + $errors['variables['.$key.']'] = get_string('unusedvar', 'qtype_algebra'); } } } |