balint777 /
POData
| Total Complexity | 92 |
| Total Lines | 728 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like ExpressionParser often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ExpressionParser, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 39 | class ExpressionParser |
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| 40 | { |
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| 41 | const RECURSION_LIMIT = 200; |
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| 42 | |||
| 43 | /** |
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| 44 | * The Lexical analyzer |
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| 45 | * |
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| 46 | * @var ExpressionLexer |
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| 47 | */ |
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| 48 | private $_lexer; |
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| 49 | |||
| 50 | /** |
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| 51 | * The current recursion depth |
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| 52 | * |
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| 53 | * @var int |
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| 54 | */ |
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| 55 | private $_recursionDepth; |
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| 56 | |||
| 57 | /** |
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| 58 | * The ResourceType on which $filter condition needs to be applied |
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| 59 | * |
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| 60 | * @var ResourceType |
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| 61 | */ |
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| 62 | private $_resourceType; |
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| 63 | |||
| 64 | /** |
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| 65 | * @var bool |
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| 66 | */ |
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| 67 | private $_isPHPExpressionProvider; |
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| 68 | |||
| 69 | /** |
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| 70 | * True if the filter expression contains level 2 property access, for example |
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| 71 | * Customers?$filter=Address/LineNumber eq 12 |
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| 72 | * Customer?$filter=Order/OrderID gt 1234 |
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| 73 | * False otherwise. |
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| 74 | * |
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| 75 | * @var bool |
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| 76 | */ |
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| 77 | private $_hasLevel2PropertyInTheExpression; |
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| 78 | |||
| 79 | |||
| 80 | /** |
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| 81 | * Construct a new instance of ExpressionParser |
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| 82 | * |
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| 83 | * @param string $text The expression to parse. |
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| 84 | * @param ResourceType $resourceType The resource type of the resource targeted by the resource path. |
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| 85 | * @param bool $isPHPExpressionProvider |
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| 86 | * |
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| 87 | * TODO Expression parser should not depend on the fact that end user is implementing IExpressionProvider or not. |
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| 88 | */ |
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| 89 | public function __construct($text, ResourceType $resourceType, $isPHPExpressionProvider) |
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| 90 | { |
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| 91 | $this->_lexer = new ExpressionLexer($text); |
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| 92 | $this->_resourceType = $resourceType; |
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| 93 | $this->_isPHPExpressionProvider = $isPHPExpressionProvider; |
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| 94 | $this->_hasLevel2PropertyInTheExpression = false; |
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| 95 | } |
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| 96 | |||
| 97 | /** |
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| 98 | * Checks whether the expression contains level 2 property access. |
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| 99 | * |
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| 100 | * @return boolean |
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| 101 | */ |
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| 102 | public function hasLevel2Property() |
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| 103 | { |
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| 104 | return $this->_hasLevel2PropertyInTheExpression; |
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|
Bug
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| 105 | } |
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| 106 | |||
| 107 | /** |
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| 108 | * Get the current token from lexer |
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| 109 | * |
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| 110 | * @return ExpressionToken |
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| 111 | */ |
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| 112 | private function _getCurrentToken() |
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| 113 | { |
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| 114 | return $this->_lexer->getCurrentToken(); |
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| 115 | } |
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| 116 | |||
| 117 | /** |
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| 118 | * Set the current token in lexer |
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| 119 | * |
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| 120 | * @param ExpressionToken $token The token to set as current token. |
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| 121 | * |
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| 122 | * @return void |
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| 123 | */ |
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| 124 | private function _setCurrentToken($token) |
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| 125 | { |
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| 126 | $this->_lexer->setCurrentToken($token); |
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| 127 | } |
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| 128 | |||
| 129 | /** |
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| 130 | * Resets parser with new expression string. |
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| 131 | * |
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| 132 | * @param string $text Reset the expression to parse. |
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| 133 | * |
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| 134 | * @return void |
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| 135 | */ |
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| 136 | public function resetParser($text) |
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| 137 | { |
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| 138 | $this->_lexer = new ExpressionLexer($text); |
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| 139 | $this->_recursionDepth = 0; |
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| 140 | } |
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| 141 | |||
| 142 | /** |
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| 143 | * Parse the expression in filter option. |
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| 144 | * |
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| 145 | * @return AbstractExpression |
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| 146 | */ |
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| 147 | public function parseFilter() |
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| 148 | { |
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| 149 | return $this->_parseExpression(); |
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| 150 | } |
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| 151 | |||
| 152 | /** |
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| 153 | * Start parsing the expression |
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| 154 | * |
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| 155 | * @return AbstractExpression |
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| 156 | */ |
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| 157 | private function _parseExpression() |
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| 158 | { |
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| 159 | $this->_recurseEnter(); |
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| 160 | $expr = $this->_parseLogicalOr(); |
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| 161 | $this->_recurseLeave(); |
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| 162 | return $expr; |
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| 163 | } |
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| 164 | |||
| 165 | /** |
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| 166 | * Parse logical or (or) |
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| 167 | * |
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| 168 | * @return AbstractExpression |
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| 169 | */ |
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| 170 | private function _parseLogicalOr() |
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| 171 | { |
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| 172 | $this->_recurseEnter(); |
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| 173 | $left = $this->_parseLogicalAnd(); |
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| 174 | while ($this->_tokenIdentifierIs(ODataConstants::KEYWORD_OR)) { |
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| 175 | $logicalOpToken = clone $this->_getCurrentToken(); |
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| 176 | $this->_lexer->nextToken(); |
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| 177 | $right = $this->_parseLogicalAnd(); |
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| 178 | FunctionDescription::verifyLogicalOpArguments($logicalOpToken, $left, $right); |
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| 179 | $left = new LogicalExpression( |
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| 180 | $left, $right, ExpressionType::OR_LOGICAL |
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| 181 | ); |
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| 182 | } |
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| 183 | |||
| 184 | $this->_recurseLeave(); |
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| 185 | return $left; |
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| 186 | } |
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| 187 | |||
| 188 | /** |
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| 189 | * Parse logical and (and). |
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| 190 | * |
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| 191 | * @return AbstractExpression |
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| 192 | */ |
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| 193 | private function _parseLogicalAnd() |
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| 194 | { |
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| 195 | $this->_recurseEnter(); |
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| 196 | $left = $this->_parseComparison(); |
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| 197 | while ($this->_tokenIdentifierIs(ODataConstants::KEYWORD_AND)) { |
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| 198 | $logicalOpToken = clone $this->_getCurrentToken(); |
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| 199 | $this->_lexer->nextToken(); |
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| 200 | $right = $this->_parseComparison(); |
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| 201 | FunctionDescription::verifyLogicalOpArguments($logicalOpToken, $left, $right); |
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| 202 | $left = new LogicalExpression($left, $right, ExpressionType::AND_LOGICAL); |
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| 203 | } |
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| 204 | |||
| 205 | $this->_recurseLeave(); |
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| 206 | return $left; |
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| 207 | } |
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| 208 | |||
| 209 | /** |
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| 210 | * Parse comparison operation (eq, ne, gt, ge, lt, le) |
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| 211 | * TODO: http://host/service/Products?$filter=Name in ('Milk', 'Cheese') |
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| 212 | * TODO: http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part2-url-conventions.html |
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| 213 | * @return AbstractExpression |
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| 214 | */ |
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| 215 | private function _parseComparison() |
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| 216 | { |
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| 217 | $this->_recurseEnter(); |
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| 218 | $left = $this->_parseAdditive(); |
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| 219 | while ($this->_getCurrentToken()->isComparisonOperator()) { |
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| 220 | $comparisonToken = clone $this->_getCurrentToken(); |
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| 221 | $this->_lexer->nextToken(); |
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| 222 | $right = $this->_parseAdditive(); |
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| 223 | $left = self::_generateComparisonExpression( |
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| 224 | $left, $right, |
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| 225 | $comparisonToken, $this->_isPHPExpressionProvider |
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| 226 | ); |
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| 227 | } |
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| 228 | |||
| 229 | $this->_recurseLeave(); |
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| 230 | return $left; |
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| 231 | } |
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| 232 | |||
| 233 | /** |
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| 234 | * Parse additive operation (add, sub). |
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| 235 | * |
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| 236 | * @return AbstractExpression |
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| 237 | */ |
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| 238 | private function _parseAdditive() |
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| 239 | { |
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| 240 | $this->_recurseEnter(); |
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| 241 | $left = $this->_parseMultiplicative(); |
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| 242 | while ($this->_getCurrentToken()->identifierIs(ODataConstants::KEYWORD_ADD) |
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| 243 | || $this->_getCurrentToken()->identifierIs(ODataConstants::KEYWORD_SUB)) { |
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| 244 | $additiveToken = clone $this->_getCurrentToken(); |
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| 245 | $this->_lexer->nextToken(); |
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| 246 | $right = $this->_parseMultiplicative(); |
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| 247 | $opReturnType = FunctionDescription::verifyAndPromoteArithmeticOpArguments($additiveToken, $left, $right); |
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| 248 | if ($additiveToken->identifierIs(ODataConstants::KEYWORD_ADD)) { |
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| 249 | $left = new ArithmeticExpression($left, $right, ExpressionType::ADD, $opReturnType); |
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| 250 | } else { |
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| 251 | $left = new ArithmeticExpression($left, $right, ExpressionType::SUBTRACT, $opReturnType); |
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| 252 | } |
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| 253 | } |
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| 254 | |||
| 255 | $this->_recurseLeave(); |
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| 256 | return $left; |
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| 257 | } |
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| 258 | |||
| 259 | /** |
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| 260 | * Parse multipicative operators (mul, div, mod) |
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| 261 | * |
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| 262 | * @return AbstractExpression |
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| 263 | */ |
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| 264 | private function _parseMultiplicative() |
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| 265 | { |
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| 266 | $this->_recurseEnter(); |
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| 267 | $left = $this->_parseUnary(); |
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| 268 | while ($this->_getCurrentToken()->identifierIs(ODataConstants::KEYWORD_MULTIPLY) |
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| 269 | || $this->_getCurrentToken()->identifierIs(ODataConstants::KEYWORD_DIVIDE) |
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| 270 | || $this->_getCurrentToken()->identifierIs(ODataConstants::KEYWORD_MODULO) |
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| 271 | ) { |
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| 272 | $multiplicativeToken = clone $this->_getCurrentToken(); |
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| 273 | $this->_lexer->nextToken(); |
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| 274 | $right = $this->_parseUnary(); |
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| 275 | $opReturnType = FunctionDescription::verifyAndPromoteArithmeticOpArguments( |
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| 276 | $multiplicativeToken, $left, $right |
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| 277 | ); |
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| 278 | if ($multiplicativeToken->identifierIs(ODataConstants::KEYWORD_MULTIPLY)) { |
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| 279 | $left = new ArithmeticExpression($left, $right, ExpressionType::MULTIPLY, $opReturnType); |
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| 280 | } else if ($multiplicativeToken->identifierIs(ODataConstants::KEYWORD_DIVIDE)) { |
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| 281 | $left = new ArithmeticExpression($left, $right, ExpressionType::DIVIDE, $opReturnType); |
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| 282 | } else { |
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| 283 | $left = new ArithmeticExpression($left, $right, ExpressionType::MODULO, $opReturnType); |
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| 284 | } |
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| 285 | } |
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| 286 | |||
| 287 | $this->_recurseLeave(); |
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| 288 | return $left; |
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| 289 | } |
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| 290 | |||
| 291 | /** |
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| 292 | * Parse unary operator (- ,not) |
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| 293 | * |
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| 294 | * @return AbstractExpression |
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| 295 | */ |
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| 296 | private function _parseUnary() |
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| 297 | { |
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| 298 | $this->_recurseEnter(); |
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| 299 | |||
| 300 | if ($this->_getCurrentToken()->Id == ExpressionTokenId::MINUS |
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| 301 | || $this->_getCurrentToken()->identifierIs(ODataConstants::KEYWORD_NOT) |
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| 302 | ) { |
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| 303 | $op = clone $this->_getCurrentToken(); |
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| 304 | $this->_lexer->nextToken(); |
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| 305 | if ($op->Id == ExpressionTokenId::MINUS |
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| 306 | && (ExpressionLexer::isNumeric($this->_getCurrentToken()->Id)) |
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| 307 | ) { |
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| 308 | $numberLiteral = $this->_getCurrentToken(); |
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| 309 | $numberLiteral->Text = '-' . $numberLiteral->Text; |
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| 310 | $numberLiteral->Position = $op->Position; |
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| 311 | $v = $this->_getCurrentToken(); |
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| 312 | $this->_setCurrentToken($numberLiteral); |
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| 313 | $this->_recurseLeave(); |
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| 314 | return $this->_parsePrimary(); |
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| 315 | } |
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| 316 | |||
| 317 | $expr = $this->_parsePrimary(); |
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| 318 | FunctionDescription::validateUnaryOpArguments($op, $expr); |
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| 319 | if ($op->Id == ExpressionTokenId::MINUS) { |
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| 320 | $expr = new UnaryExpression($expr, ExpressionType::NEGATE, $expr->getType()); |
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| 321 | } else { |
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| 322 | $expr = new UnaryExpression($expr, ExpressionType::NOT_LOGICAL, new Boolean()); |
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| 323 | } |
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| 324 | |||
| 325 | $this->_recurseLeave(); |
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| 326 | return $expr; |
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| 327 | } |
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| 328 | |||
| 329 | $this->_recurseLeave(); |
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| 330 | return $this->_parsePrimary(); |
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| 331 | } |
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| 332 | |||
| 333 | /** |
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| 334 | * Start parsing the primary. |
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| 335 | * |
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| 336 | * @return AbstractExpression |
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| 337 | */ |
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| 338 | private function _parsePrimary() |
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| 339 | { |
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| 340 | $this->_recurseEnter(); |
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| 341 | $expr = $this->_parsePrimaryStart(); |
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| 342 | while (true) { |
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| 343 | if ($this->_getCurrentToken()->Id == ExpressionTokenId::SLASH) { |
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| 344 | $this->_lexer->nextToken(); |
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| 345 | $expr = $this->_parsePropertyAccess($expr); |
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| 346 | } else { |
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| 347 | break; |
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| 348 | } |
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| 349 | } |
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| 350 | |||
| 351 | $this->_recurseLeave(); |
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| 352 | return $expr; |
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| 353 | } |
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| 354 | |||
| 355 | /** |
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| 356 | * Parse primary tokens [literals, identifiers (e.g. function call), open param for sub expressions] |
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| 357 | * |
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| 358 | * |
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| 359 | * @return AbstractExpression |
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| 360 | */ |
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| 361 | private function _parsePrimaryStart() |
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| 362 | { |
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| 363 | switch ($this->_lexer->getCurrentToken()->Id) { |
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| 364 | case ExpressionTokenId::BOOLEAN_LITERAL: |
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| 365 | return $this->_parseTypedLiteral(new Boolean()); |
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| 366 | case ExpressionTokenId::DATETIME_LITERAL: |
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| 367 | return $this->_parseTypedLiteral(new DateTime()); |
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| 368 | case ExpressionTokenId::DECIMAL_LITERAL: |
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| 369 | return $this->_parseTypedLiteral(new Decimal()); |
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| 370 | case ExpressionTokenId::NULL_LITERAL: |
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| 371 | return $this->_parseNullLiteral(); |
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| 372 | case ExpressionTokenId::IDENTIFIER: |
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| 373 | return $this->_parseIdentifier(); |
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| 374 | case ExpressionTokenId::STRING_LITERAL: |
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| 375 | return $this->_parseTypedLiteral(new StringType()); |
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| 376 | case ExpressionTokenId::INT64_LITERAL: |
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| 377 | return $this->_parseTypedLiteral(new Int64()); |
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| 378 | case ExpressionTokenId::INTEGER_LITERAL: |
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| 379 | return $this->_parseTypedLiteral(new Int32()); |
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| 380 | case ExpressionTokenId::DOUBLE_LITERAL: |
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| 381 | return $this->_parseTypedLiteral(new Double()); |
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| 382 | case ExpressionTokenId::SINGLE_LITERAL: |
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| 383 | return $this->_parseTypedLiteral(new Single()); |
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| 384 | case ExpressionTokenId::GUID_LITERAL: |
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| 385 | return $this->_parseTypedLiteral(new Guid()); |
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| 386 | case ExpressionTokenId::BINARY_LITERAL: |
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| 387 | throw new NotImplementedException( |
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| 388 | 'Support for binary is not implemented' |
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| 389 | ); |
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| 390 | //return $this->_parseTypedLiteral(new Binary()); |
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| 391 | case ExpressionTokenId::OPENPARAM: |
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| 392 | return $this->_parseParenExpression(); |
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| 393 | default: |
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| 394 | throw ODataException::createSyntaxError("Expression expected."); |
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| 395 | } |
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| 396 | } |
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| 397 | |||
| 398 | /** |
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| 399 | * Parse Sub expression. |
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| 400 | * |
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| 401 | * @return AbstractExpression |
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| 402 | */ |
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| 403 | private function _parseParenExpression() |
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| 404 | { |
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| 405 | if ($this->_getCurrentToken()->Id != ExpressionTokenId::OPENPARAM) { |
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| 406 | throw ODataException::createSyntaxError("Open parenthesis expected."); |
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| 407 | } |
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| 408 | |||
| 409 | $this->_lexer->nextToken(); |
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| 410 | $expr = $this->_parseExpression(); |
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| 411 | if ($this->_getCurrentToken()->Id != ExpressionTokenId::CLOSEPARAM) { |
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| 412 | throw ODataException::createSyntaxError("Close parenthesis expected."); |
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| 413 | } |
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| 414 | |||
| 415 | $this->_lexer->nextToken(); |
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| 416 | return $expr; |
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| 417 | } |
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| 418 | |||
| 419 | /** |
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| 420 | * Parse an identifier |
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| 421 | * |
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| 422 | * @return AbstractExpression |
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| 423 | */ |
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| 424 | private function _parseIdentifier() |
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| 425 | { |
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| 426 | $this->_validateToken(ExpressionTokenId::IDENTIFIER); |
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| 427 | |||
| 428 | // An open paren here would indicate calling a method |
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| 429 | $identifierIsFunction = $this->_lexer->peekNextToken()->Id == ExpressionTokenId::OPENPARAM; |
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| 430 | if ($identifierIsFunction) { |
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| 431 | return $this->_parseIdentifierAsFunction(); |
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| 432 | } else { |
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| 433 | return $this->_parsePropertyAccess(null); |
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| 434 | } |
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| 435 | } |
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| 436 | |||
| 437 | /** |
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| 438 | * Parse a property access |
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| 439 | * |
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| 440 | * @param PropertyAccessExpression $parentExpression Parent expression. |
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| 441 | * |
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| 442 | * @throws ODataException |
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| 443 | * |
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| 444 | * @return PropertyAccessExpression |
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| 445 | */ |
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| 446 | private function _parsePropertyAccess($parentExpression) |
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| 482 | } |
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| 483 | |||
| 484 | /** |
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| 485 | * Try to parse an identifier which is followed by an opern bracket as |
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| 486 | * astoria URI function call. |
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| 487 | * |
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| 488 | * @return AbstractExpression |
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| 489 | * |
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| 490 | * @throws ODataException |
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| 491 | */ |
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| 492 | private function _parseIdentifierAsFunction() |
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| 493 | { |
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| 494 | $functionToken = clone $this->_getCurrentToken(); |
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| 495 | $functions = FunctionDescription::verifyFunctionExists($functionToken); |
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| 496 | $this->_lexer->nextToken(); |
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| 497 | $paramExpressions = $this->_parseArgumentList(); |
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| 498 | $function = FunctionDescription::verifyFunctionCallOpArguments( |
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| 499 | $functions, $paramExpressions, $functionToken |
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| 500 | ); |
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| 501 | return new FunctionCallExpression($function, $paramExpressions); |
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| 502 | } |
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| 503 | |||
| 504 | /** |
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| 505 | * Start parsing argument list of a function-call |
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| 506 | * |
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| 507 | * @return array<AbstractExpression> |
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| 508 | */ |
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| 509 | private function _parseArgumentList() |
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| 510 | { |
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| 511 | if ($this->_getCurrentToken()->Id != ExpressionTokenId::OPENPARAM) { |
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| 512 | throw ODataException::createSyntaxError("Open parenthesis expected."); |
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| 513 | } |
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| 514 | |||
| 515 | $this->_lexer->nextToken(); |
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| 516 | $args |
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| 517 | = $this->_getCurrentToken()->Id != ExpressionTokenId::CLOSEPARAM |
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| 518 | ? $this->_parseArguments() : array(); |
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| 519 | if ($this->_getCurrentToken()->Id != ExpressionTokenId::CLOSEPARAM) { |
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| 520 | throw ODataException::createSyntaxError("Close parenthesis expected."); |
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| 521 | } |
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| 522 | |||
| 523 | $this->_lexer->nextToken(); |
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| 524 | return $args; |
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| 525 | } |
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| 526 | |||
| 527 | /** |
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| 528 | * Parse arguments of a function-call. |
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| 529 | * |
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| 530 | * @return array<AbstractExpression> |
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| 531 | */ |
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| 532 | private function _parseArguments() |
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| 533 | { |
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| 534 | $argList = array(); |
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| 535 | while (true) { |
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| 536 | $argList[] = $this->_parseExpression(); |
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| 537 | if ($this->_getCurrentToken()->Id != ExpressionTokenId::COMMA) { |
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| 538 | break; |
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| 539 | } |
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| 540 | |||
| 541 | $this->_lexer->nextToken(); |
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| 542 | } |
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| 543 | |||
| 544 | return $argList; |
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| 545 | } |
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| 546 | |||
| 547 | /** |
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| 548 | * Parse primitive type literal. |
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| 549 | * |
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| 550 | * @param IType $targetType Expected type of the current literal. |
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| 551 | * |
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| 552 | * @return AbstractExpression |
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| 553 | * |
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| 554 | * @throws ODataException |
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| 555 | */ |
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| 556 | private function _parseTypedLiteral(IType $targetType) |
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| 557 | { |
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| 558 | $literal = $this->_lexer->getCurrentToken()->Text; |
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| 559 | $outVal = null; |
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| 560 | if (!$targetType->validate($literal, $outVal)) { |
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| 561 | throw ODataException::createSyntaxError( |
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| 562 | Messages::expressionParserUnrecognizedLiteral( |
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| 563 | $targetType->getFullTypeName(), |
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| 564 | $literal, |
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| 565 | $this->_lexer->getCurrentToken()->Position |
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| 566 | ) |
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| 567 | ); |
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| 568 | } |
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| 569 | |||
| 570 | $result = new ConstantExpression($outVal, $targetType); |
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| 571 | $this->_lexer->nextToken(); |
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| 572 | return $result; |
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| 573 | } |
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| 574 | |||
| 575 | /** |
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| 576 | * Parse null literal. |
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| 577 | * |
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| 578 | * @return ConstantExpression |
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| 579 | */ |
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| 580 | private function _parseNullLiteral() |
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| 584 | } |
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| 585 | |||
| 586 | /** |
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| 587 | * Check the current token is of a specific kind |
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| 588 | * |
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| 589 | * @param ExpressionTokenId $expressionTokenId Token to check |
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| 590 | * with current token. |
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| 591 | * |
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| 592 | * @return boolean |
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| 593 | */ |
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| 594 | private function _tokenIdentifierIs($expressionTokenId) |
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| 595 | { |
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| 596 | return $this->_getCurrentToken()->identifierIs($expressionTokenId); |
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| 597 | } |
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| 598 | |||
| 599 | /** |
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| 600 | * Validate the current token |
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| 601 | * |
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| 602 | * @param ExpressionTokenId $expressionTokenId Token to check |
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| 603 | * with current token. |
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| 604 | * |
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| 605 | * @return void |
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| 606 | * |
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| 607 | * @throws ODataException |
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| 608 | */ |
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| 609 | private function _validateToken($expressionTokenId) |
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| 613 | } |
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| 614 | } |
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| 615 | |||
| 616 | /** |
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| 617 | * Increment recursion count and throw error if beyond limit |
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| 618 | * |
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| 619 | * @return void |
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| 620 | * |
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| 621 | * @throws ODataException If max recursion limit hits. |
||
| 622 | */ |
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| 623 | private function _recurseEnter() |
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| 624 | { |
||
| 625 | $this->_recursionDepth++; |
||
| 626 | if ($this->_recursionDepth == self::RECURSION_LIMIT) { |
||
| 627 | throw ODataException::createSyntaxError("Recursion limit reached."); |
||
| 628 | } |
||
| 629 | } |
||
| 630 | |||
| 631 | /** |
||
| 632 | * Decrement recursion count |
||
| 633 | * |
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| 634 | * @return void |
||
| 635 | */ |
||
| 636 | private function _recurseLeave() |
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| 637 | { |
||
| 638 | $this->_recursionDepth--; |
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| 639 | } |
||
| 640 | |||
| 641 | /** |
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| 642 | * Generates Comparison Expression |
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| 643 | * |
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| 644 | * @param AbstractExpression $left The LHS expression. |
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| 645 | * @param AbstractExpression $right The RHS expression. |
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| 646 | * @param ExpressionToken $expressionToken The comparison expression token. |
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| 647 | * @param boolean $isPHPExpressionProvider |
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| 648 | * |
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| 649 | * @return AbstractExpression |
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| 650 | */ |
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| 651 | private static function _generateComparisonExpression($left, $right, $expressionToken, $isPHPExpressionProvider) |
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| 767 | ); |
||
| 768 | } |
||
| 769 | } |
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| 770 | |||
| 771 | } |
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| 772 |
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