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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, 2015 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 licence along with the code. |
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*/ |
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namespace Lechimp\Dicto\Analysis; |
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use Lechimp\Dicto\Variables as Vars; |
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use Lechimp\Dicto\Variables\Variable; |
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/** |
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* Implementation for Query::compile_var. |
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*/ |
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trait CompilesVars { |
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/** |
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* Get a builder to create queries. |
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* |
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* @return QueryBuilder |
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*/ |
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abstract public function builder(); |
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/** |
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* Compile a variable to an SQL statement over a named table. |
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* |
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* @param string $table_name |
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* @param Vars\Variable $var |
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* @param bool $negate |
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* @return string|CompositeExpression |
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*/ |
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public function compile_var($table_name, Vars\Variable $var, $negate = false) { |
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$b = $this->builder()->expr(); |
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// Since SQL does not have a statement for negating while expressions, |
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// we need to negate the single conditions in the expression, which |
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// most often is the equality operator here. |
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if (!$negate) { |
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$eq_op = function($l, $r) use ($b) { |
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return $b->eq($l, $r); |
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}; |
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} |
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else { |
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$eq_op = function($l, $r) use ($b) { |
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return $b->neq($l, $r); |
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}; |
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} |
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// sugar: |
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$compile = function($dir, Vars\Compound $var, $negate = false) use ($table_name) { |
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return $this->compile_var($table_name, $var->$dir(), $negate); |
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}; |
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// Pattern matching on variable type. |
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if ($var instanceof Vars\AsWellAs) { |
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// normal case: left_condition or right_condition |
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if (!$negate) { |
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return $b->orX |
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( $compile("left", $var) |
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, $compile("right", $var) |
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); |
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} |
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// negated case: not (left_condition or right_condition) |
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// = not left_condition and not right_condition |
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if ($negate) { |
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return $b->andX |
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( $compile("left", $var, true) |
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, $compile("right", $var, true) |
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); |
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} |
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} |
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if ($var instanceof Vars\ButNot) { |
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return $b->andX |
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( $compile("left", $var) |
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, $compile("right", $var, true) |
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); |
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} |
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if ($var instanceof Vars\Classes) { |
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return $eq_op("$table_name.type", $b->literal(Variable::CLASS_TYPE)); |
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} |
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if ($var instanceof Vars\Everything) { |
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return $eq_op($b->literal(1), $b->literal(1)); |
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} |
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if ($var instanceof Vars\Files) { |
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return $eq_op("$table_name.type", $b->literal(Variable::FILE_TYPE)); |
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} |
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if ($var instanceof Vars\Functions) { |
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return $eq_op("$table_name.type", $b->literal(Variable::FUNCTION_TYPE)); |
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} |
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if ($var instanceof Vars\Globals) { |
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return $eq_op("$table_name.type", $b->literal(Variable::GLOBAL_TYPE)); |
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} |
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if ($var instanceof Vars\LanguageConstruct) { |
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// normal case : language construct and name matches |
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if (!$negate) { |
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return $b->andX |
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( $eq_op("$table_name.type", $b->literal(Variable::LANGUAGE_CONSTRUCT_TYPE)) |
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, $eq_op("$table_name.name", $b->literal($var->construct_name())) |
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); |
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} |
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// negated case: not (language construct and name matches) |
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// = not language construct or not name matches |
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else { |
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return $b->orX |
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( $eq_op("$table_name.type", $b->literal(Variable::LANGUAGE_CONSTRUCT_TYPE)) |
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, $eq_op("$table_name.name", $b->literal($var->construct_name())) |
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); |
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} |
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} |
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if ($var instanceof Vars\Methods) { |
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return $eq_op("$table_name.type", $b->literal(Variable::METHOD_TYPE)); |
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} |
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if ($var instanceof Vars\WithName) { |
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// normal case : left_condition AND regexp matches |
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if (!$negate) { |
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return $b->andX |
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( $this->compile_var($table_name, $var->variable()) |
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, "$table_name.name REGEXP ".$b->literal('^'.$var->regexp().'$') |
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); |
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} |
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// negated case: not (left_condition_left and regexp matches) |
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// = not left_condition and not regexp matches |
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else { |
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return $b->orX |
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( $this->compile_var($table_name, $var->variable(), true) |
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, "$table_name.name NOT REGEXP ".$b->literal('^'.$var->regexp().'$') |
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); |
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} |
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} |
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throw new \LogicException("Can't compile var-type '".get_class($var)."'"); |
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} |
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} |
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lechimp-p /
dicto.php
