133 lines
4.2 KiB
PHP
133 lines
4.2 KiB
PHP
<?php
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require_once "OpenEndedTask.php";
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require_once "class/LogicUtils.php";
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class NumberConversionTask extends OpenEndedTask
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{
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protected string $instruction; // instruction word
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protected string $source; // source
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// runtime variables -----
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private int $src_base; // source number system
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private string $src_rep; // source representation
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private int $src_n_digits; // minimum number of digits in the source
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private int $dst_base; // destination number system
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private string $dst_rep; // destination representation
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private int $dst_n_digits; // number of digits in the destination
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// -------------------------
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public function __construct(array &$a = null)
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{
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parent::__construct($a);
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$this->setType("numberconversion");
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// get instruction word
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$this->instruction = strtolower(trim($a["instruction"] ?? "10u:2->2u:4"));
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// expand it
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$pattern = "/([0-9]+)([suc]):([0-9]+)->([0-9]+)([suc]):([0-9]+)/";
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preg_match($pattern, $this->instruction, $matches);
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// if the instruction was meaningful
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if (count($matches) == 7) {
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$this->src_base = (int)$matches[1];
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$this->src_rep = $matches[2];
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$this->src_n_digits = $matches[3];
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$this->dst_base = (int)$matches[4];
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$this->dst_rep = $matches[5];
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$this->dst_n_digits = $matches[6];
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} else { // no valid instruction word has been passed
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$this->src_base = 10;
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$this->src_rep = "u";
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$this->src_n_digits = 2;
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$this->dst_base = 2;
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$this->dst_rep = "u";
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$this->dst_n_digits = 4;
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$this->instruction = $this->src_base . $this->src_rep . ":" . $this->src_n_digits . "->" . $this->dst_base . $this->dst_rep . ":" . $this->dst_n_digits;
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}
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$this->source = $a["source"] ?? "---";
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$this->correct_answer = $a["correct_answer"] ?? "---";
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}
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public function toArray(string $mode = "all"): array
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{
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$a = parent::toArray($mode);
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$a["instruction"] = $this->instruction;
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$a["source"] = $this->source;
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$a["correct_answer"] = $this->correct_answer;
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return $a;
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}
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public function randomize(): void
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{
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parent::randomize();
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// validate representation marks
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$invalid = in_array($this->src_rep . $this->dst_rep, ["us", "su"]);
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if ($invalid) { // fix invalid representation pairs
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$this->dst_rep = "u";
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$this->src_rep = "u";
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}
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// switch between source and destination constrains
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if ($this->hasFlag("sourceconstrain")) {
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$base = $this->src_base;
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$n_digits = $this->src_n_digits;
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$rep = $this->src_rep;
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} else {
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$base = $this->dst_base;
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$n_digits = $this->dst_n_digits;
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$rep = $this->dst_rep;
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}
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// specify the range
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$max = 1;
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$min = 0;
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switch ($rep) {
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case "u":
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$max = pow($base, $n_digits) - 1;
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$min = 0;
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break;
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case "s":
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$max = pow($base, $n_digits) - 1;
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$min = -$max;
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break;
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case "c":
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$max = pow($base, $n_digits - 1) - 1;
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$min = -($max + 1);
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break;
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}
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// randomize a value
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$m = random_int($min, $max);
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// create the question and the answer
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$this->correct_answer = LogicUtils::changeRepresentation($m, $this->dst_base, $this->dst_rep, $this->dst_n_digits);
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$this->source = LogicUtils::changeRepresentation($m, $this->src_base, $this->src_rep, $this->src_n_digits);
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}
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public function staticCheck(): void
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{
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$mark = 0.0;
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$pa = strtolower($this->player_answer);
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$ca = $this->correct_answer;
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if (($ca[0] === "-") && ($pa[0] !== "-")) {
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goto setmark;
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}
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if ($this->hasFlag("acceptwithoutleadingzeros")) {
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$mark = (ltrim($pa, "+- 0") === ltrim($ca, "-0")) ? $this->getMaxMark() : 0.0;
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} else {
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$mark = (trim($pa) === trim($ca)) ? $this->getMaxMark() : 0.0;
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}
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setmark:
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$this->setMark($mark);
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}
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} |