mirror of https://github.com/BOINC/boinc.git
66 lines
1.6 KiB
PHP
66 lines
1.6 KiB
PHP
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<?php
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// An iterator represents a user's position in a course.
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// Its state is stored in the database,
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// and the course may change underneath it.
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//
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// A state in a course is described by:
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// - an associative array mapping logical names to state structures.
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// Typically this includes the logical name of the current child
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// and info such as a sequence index.
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// This is kind of like a "call stack",
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// except that it can contain units not currently active.
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//
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class BoltIter {
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public $top; // topmost unit
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public $state;
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public $xset; // exercise set, if any
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// the following are temps
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public $item; // current item
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public $frac_done; // fraction done
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function __construct($top) {
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$this->top = $top;
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$this->state = array();
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}
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function decode_state($encoded_state) {
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$this->state = json_decode($encoded_state, true);
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}
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function encode_state() {
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return json_encode($this->state);
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}
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// get current item and fraction done
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//
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function at() {
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$this->xset = null;
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$this->top->walk($this, false, $this->frac_done);
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}
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// move to the next item, and return it in $this->item
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// (null if course finished)
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//
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function next() {
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$this->top->walk($this, true, $this->frac_done);
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}
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}
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function enum_course($course) {
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$iter = new BoltIter($course);
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while (1) {
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$x = $iter->at();
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if (!$x) break;
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echo "at: $x->url\n";
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$x = $iter->next();
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if (!$x) break;
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echo "next: $x->filename\n";
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}
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echo "course over\n";
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}
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?>
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