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<?php |
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/****************************************************************************** |
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* An implementation of dicto (scg.unibe.ch/dicto) in and for PHP. |
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* |
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* Copyright (c) 2016 Richard Klees <[email protected]> |
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* |
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* This software is licensed under The MIT License. You should have received |
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* a copy of the license along with the code. |
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*/ |
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namespace Lechimp\Dicto\Graph; |
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class QueryImpl implements Query { |
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/** |
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* @var Graph |
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*/ |
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protected $graph; |
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/** |
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* @var array[] |
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*/ |
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protected $steps; |
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public function __construct(Graph $graph) { |
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$this->graph = $graph; |
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$this->steps = []; |
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} |
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/** |
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* @inheritdocs |
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*/ |
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public function expand(\Closure $expander) { |
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$clone = clone $this; |
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$clone->steps[] = ["expand", $expander]; |
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assert('$this->steps != $clone->steps'); |
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return $clone; |
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} |
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/** |
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* @inheritdocs |
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*/ |
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public function extract(\Closure $extractor) { |
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$clone = clone $this; |
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$clone->steps[] = ["extract", $extractor]; |
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assert('$this->steps != $clone->steps'); |
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return $clone; |
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} |
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/** |
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* @inheritdocs |
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*/ |
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public function filter(\Closure $filter) { |
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$clone = clone $this; |
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$clone->steps[] = ["filter", $filter]; |
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assert('$this->steps != $clone->steps'); |
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return $clone; |
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} |
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/** |
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* @inheritdocs |
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*/ |
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public function run($result) { |
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$nodes = $this->add_result($this->graph->nodes(), $result); |
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foreach ($this->steps as $step) { |
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if (count($nodes) == 0) { |
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return []; |
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} |
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list($cmd,$clsr) = $step; |
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if ($cmd == "expand") { |
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$nodes = $this->run_expand($nodes, $clsr); |
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} |
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elseif ($cmd == "extract") { |
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$this->run_extract($nodes, $clsr); |
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} |
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elseif ($cmd == "filter") { |
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$nodes = $this->run_filter($nodes, $clsr); |
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} |
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else { |
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throw new \LogicException("Unknown command: $cmd"); |
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} |
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} |
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return array_values(array_map(function($r) { |
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return $r[1]; |
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}, $nodes)); |
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} |
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protected function run_expand(array &$nodes, \Closure $clsr) { |
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$new_nodes = []; |
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foreach ($nodes as $r) { |
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list($node, $result) = $r; |
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$new_nodes[] = $this->add_result($clsr($node), $result); |
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} |
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if (count($new_nodes) == 0) { |
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return []; |
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} |
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return call_user_func_array("array_merge", $new_nodes); |
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} |
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protected function run_extract(array &$nodes, \Closure $clsr) { |
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foreach ($nodes as $i => $r) { |
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list($node, $result) = $r; |
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if (is_object($result)) { |
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$clsr($node, clone $result); |
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} |
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else { |
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$clsr($node, $result); |
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} |
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$nodes[$i][1] = $result; |
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} |
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} |
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protected function run_filter(array &$nodes, \Closure $clsr) { |
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$res = []; |
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foreach ($nodes as $r) { |
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list($node, $result) = $r; |
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if ($clsr($node, $result)) { |
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$res[] = $r; |
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} |
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} |
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return $res; |
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} |
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protected function add_result(array $nodes, &$result) { |
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$res = []; |
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foreach ($nodes as $node) { |
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$res[] = [$node, $result]; |
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} |
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return $res; |
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} |
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} |
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lechimp-p /
dicto.php
