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-rw-r--r--displayformula.php12
-rw-r--r--lang/en/qtype_algebra.php6
-rw-r--r--parser.php42
-rw-r--r--pix/icon.svg56
-rw-r--r--settings.php7
-rw-r--r--tests/behat/preview.feature4
-rw-r--r--tests/parser_test.php6
-rw-r--r--version.php2
8 files changed, 104 insertions, 31 deletions
diff --git a/displayformula.php b/displayformula.php
index 8c4cf8c..09f4cff 100644
--- a/displayformula.php
+++ b/displayformula.php
@@ -26,13 +26,16 @@
* the mathJax filter to be present.
*/
+
require_once('../../../config.php');
require_once("$CFG->dirroot/question/type/algebra/parser.php");
-global $PAGE, $CFG;
+global $PAGE;
require_login();
$p = new qtype_algebra_parser;
+$validanswer = true;
+
try {
$query = urldecode($_SERVER['QUERY_STRING']);
$m = array();
@@ -52,12 +55,17 @@ try {
}
}
} catch (Exception $e) {
+ $validanswer = false;
$texexp = get_string('parseerror', 'qtype_algebra', $e->getMessage());
}
$formatoptions = new stdClass;
$formatoptions->para = false;
$PAGE->set_context(context_system::instance());
-$text = format_text($texexp, FORMAT_MOODLE, $formatoptions);
+if ($validanswer) {
+ $text = format_text($texexp, FORMAT_MOODLE, $formatoptions);
+} else {
+ $text = get_string('invalidanswer', 'qtype_algebra');
+}
?>
<html>
<head>
diff --git a/lang/en/qtype_algebra.php b/lang/en/qtype_algebra.php
index 7760584..26b6fe1 100644
--- a/lang/en/qtype_algebra.php
+++ b/lang/en/qtype_algebra.php
@@ -140,4 +140,8 @@ $string['port'] = 'Port of SAGE server';
$string['uri'] = 'uri of SAGE server';
$string['texdelimiters'] = 'Delimiters for TeX expressions';
$string['dollars'] = '$$...$$';
-$string['brackets'] = '\[...\]'; \ No newline at end of file
+$string['brackets'] = '\[...\]';
+$string['invalidanswer'] = 'Invalid or unrecongnized answer';
+$string['multiplyoperator'] = 'TeX operator for multiplication';
+$string['times'] = '\\times';
+$string['cdot'] = '\\cdot'; \ No newline at end of file
diff --git a/parser.php b/parser.php
index 766797a..6068b25 100644
--- a/parser.php
+++ b/parser.php
@@ -21,20 +21,9 @@
defined('MOODLE_INTERNAL') || die();
-// From the PHP manual: check for the existance of lcfirst and
-// if not found create one.
-if (!function_exists('lcfirst')) {
- /**
- * Make a string's first character lowercase
- *
- * @param string $str
- * @return string the resulting string.
- */
- function lcfirst( $str ) {
- $str[0] = strtolower($str[0]);
- return (string)$str;
- }
-}
+require_once(__DIR__.'/../../../config.php');
+
+require_login();
/**
* Helper function which will compare two strings using their length only.
@@ -42,20 +31,22 @@ if (!function_exists('lcfirst')) {
* This function is intended for use in sorting arrays of strings by their string
* length. This is used to order arrays for regular expressions so that the longest
* expressions are checked first.
+ * In this version, if both strings have equal length, string order is used. So this
+ * version of the sort is stable.
*
* @param $a first string to compare
* @param $b second string to compare
- * @return -1 if $a is longer than $b, 0 if they are the same length and +1 if $a is shorter
+ * @return -1 if $a is longer than $b, and +1 if $a is shorter
*/
function qtype_algebra_parser_strlen_sort($a, $b) {
// Get the two string lengths once so we don't have to repeat the function call.
$alen = strlen($a);
$blen = strlen($b);
- // If the two lengths are equal return zero.
+ // If the two lengths are equal use strings order.
if ($alen == $blen) {
- return 0;
+ return ($a > $b) ? -1 : +1;
}
- // Otherwise return +1 if a > b or -1 if a < b.
+ // Otherwise return +1 if a is shorter or -1 if longer.
return ($alen > $blen) ? -1 : +1;
}
@@ -73,6 +64,7 @@ class qtype_algebra_parser_term {
public $_arguments = array(); // Array of arguments in class form.
public $_formats; // Array of format strings.
public $_nargs; // Number of arguments for this term.
+
/**
* Constructor for the generic parser term.
*
@@ -434,7 +426,8 @@ class qtype_algebra_parser_term {
* throw an exception in such cases.
*/
class qtype_algebra_parser_nullterm extends qtype_algebra_parser_term {
-
+ /** @var The TeX multiply operator. */
+ public $id;
/**
* Constructs an instance of a null term.
*
@@ -505,7 +498,7 @@ class qtype_algebra_parser_number extends qtype_algebra_parser_term {
$this->_base = $m[1];
$this->_exp = $m[2];
$eformats = array('str' => '%sE%s',
- 'tex' => '%s \\times 10^{%s}');
+ 'tex' => '%s \\' . get_config('qtype_algebra', 'multiplyoperator') . '10^{%s}');
parent::__construct(self::NARGS, $eformats, $text);
} else {
$this->_base = $text;
@@ -654,7 +647,7 @@ class qtype_algebra_parser_variable extends qtype_algebra_parser_term {
// Extract the remaining characters for use as the subscript.
$this->_subscript = substr($text, strlen($m[1]));
// If the first letter of the subscript is an underscore then remove it.
- if ($this->_subscript[0] == '_') {
+ if (strlen($this->_subscript) != 0 && $this->_subscript[0] == '_') {
$this->_subscript = substr($this->_subscript, 1);
}
// Call the base class constructor with the variable text set to the combination of the
@@ -879,7 +872,7 @@ class qtype_algebra_parser_multiply extends qtype_algebra_parser_term {
*/
public function __construct($text) {
$this->mformats = array('*' => array('str' => '%s*%s',
- 'tex' => '%s \\times %s'),
+ 'tex' => '%s \\' . get_config('qtype_algebra', 'multiplyoperator') . ' %s'),
'.' => array('str' => '%s %s',
'tex' => '%s %s',
'sage' => '%s*%s')
@@ -900,7 +893,7 @@ class qtype_algebra_parser_multiply extends qtype_algebra_parser_term {
parent::set_arguments($args);
// Set the default explicit format.
$this->_formats = $this->mformats['*'];
- // Only allow the implicit multipication if the second argument is either a
+ // Only allow the implicit multiplication if the second argument is either a
// special, variable, function or bracket and not negative. In all other cases the operator must be
// explicitly written.
if (is_a($args[1], 'qtype_algebra_parser_bracket') or
@@ -918,7 +911,7 @@ class qtype_algebra_parser_multiply extends qtype_algebra_parser_term {
// power terms are parsed before multiplication ones and are required to
// have two arguments.
$powargs = $args[1]->arguments();
- // Allow the implicit multipication if the power's first argument is either a
+ // Allow the implicit multiplication if the power's first argument is either a
// special, variable, function or bracket and not negative.
if (is_a($powargs[0], 'qtype_algebra_parser_bracket') or
is_a($powargs[0], 'qtype_algebra_parser_variable') or
@@ -1728,4 +1721,3 @@ class qtype_algebra_parser {
// Sort static arrays once here by inverse string length.
usort(qtype_algebra_parser_variable::$greek, 'qtype_algebra_parser_strlen_sort');
usort(qtype_algebra_parser::$functions, 'qtype_algebra_parser_strlen_sort');
-
diff --git a/pix/icon.svg b/pix/icon.svg
new file mode 100644
index 0000000..7f4ba9e
--- /dev/null
+++ b/pix/icon.svg
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+ xmlns:dc="http://purl.org/dc/elements/1.1/"
+ xmlns:cc="http://creativecommons.org/ns#"
+ xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+ xmlns:svg="http://www.w3.org/2000/svg"
+ xmlns="http://www.w3.org/2000/svg"
+ version="1.1"
+ id="svg2"
+ preserveAspectRatio="xMinYMid meet"
+ height="16"
+ width="16"
+ style="isolation:isolate">
+ <metadata
+ id="metadata17">
+ <rdf:RDF>
+ <cc:Work
+ rdf:about="">
+ <dc:format>image/svg+xml</dc:format>
+ <dc:type
+ rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+ <dc:title></dc:title>
+ </cc:Work>
+ </rdf:RDF>
+ </metadata>
+ <defs
+ id="defs4">
+ <clipPath
+ id="a">
+ <path
+ id="path7"
+ d="M0 0h16v16H0z" />
+ </clipPath>
+ </defs>
+ <g
+ transform="translate(0,2.9491527)"
+ id="g9"
+ clip-path="url(#a)">
+ <path
+ id="path11"
+ d="m 16,6 0,-1 -16,0 0,6 16,0 0,-1 -15,0 0,-4 14,0 0,4 1,0 0,-4 z" />
+ <path
+ style="fill:#ffffff"
+ id="path13"
+ d="M 1,6 15,6 15,10 1,10 1,6 Z" />
+ </g>
+ <text
+ id="text3345"
+ y="5.6271191"
+ x="-3.2833064e-008"
+ style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:7.5px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Bold';text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ xml:space="preserve"><tspan
+ y="5.6271191"
+ x="-3.2833064e-008"
+ id="tspan3347">x=y</tspan></text>
+</svg>
diff --git a/settings.php b/settings.php
index 399c04c..525324a 100644
--- a/settings.php
+++ b/settings.php
@@ -47,4 +47,11 @@ if ($ADMIN->fulltree) {
array('old' => new lang_string('dollars', 'qtype_algebra'),
'new' => new lang_string('brackets', 'qtype_algebra')
)));
+ // TeX operator for multiplication.
+ $settings->add(new admin_setting_configselect('qtype_algebra/multiplyoperator',
+ new lang_string('multiplyoperator', 'qtype_algebra'),
+ '', 'times',
+ array('times' => new lang_string('times', 'qtype_algebra'),
+ 'cdot' => new lang_string('cdot', 'qtype_algebra')
+ )));
}
diff --git a/tests/behat/preview.feature b/tests/behat/preview.feature
index 24f53ab..fec1b29 100644
--- a/tests/behat/preview.feature
+++ b/tests/behat/preview.feature
@@ -1,7 +1,7 @@
@qtype @qtype_algebra
-Feature: Preview a Short answer question
+Feature: Preview an Algebra question
As a teacher
- In order to check my Short answer questions will work for students
+ In order to check my Algebra questions will work for students
I need to preview them
Background:
diff --git a/tests/parser_test.php b/tests/parser_test.php
index 5d5eaad..309984c 100644
--- a/tests/parser_test.php
+++ b/tests/parser_test.php
@@ -26,6 +26,8 @@
defined('MOODLE_INTERNAL') || die();
global $CFG;
+require_once($CFG->dirroot . '/question/engine/tests/helpers.php');
+require_once($CFG->dirroot . '/question/type/algebra/tests/helper.php');
require_once($CFG->dirroot . '/question/type/algebra/parser.php');
@@ -61,5 +63,9 @@ class qtype_algebra_parser_test extends advanced_testcase {
$this->assertEquals('\sin \left( 4 x_{} \right) + \cos \left( 5 y_{} \right)', $expr->tex());
$expr = $p->parse('sin(6*x) + cos(7*y)');
$this->assertEquals('\sin \left( 6 x_{} \right) + \cos \left( 7 y_{} \right)', $expr->tex());
+ $expr = $p->parse('3x y');
+ $this->assertEquals('3 x_{} y_{}', $expr->tex());
+ $expr = $p->parse('x*y*3');
+ $this->assertEquals('x_{} y_{} \times 3 ', $expr->tex());
}
}
diff --git a/version.php b/version.php
index aac10d7..7eb6e41 100644
--- a/version.php
+++ b/version.php
@@ -23,7 +23,7 @@
defined('MOODLE_INTERNAL') || die();
$plugin->component = 'qtype_algebra';
-$plugin->version = 2017121900;
+$plugin->version = 2018010400;
$plugin->requires = 2013050100;
$plugin->release = '1.6 for Moodle 2.8, ... 3.5';