162 lines
4.3 KiB
PHP
162 lines
4.3 KiB
PHP
<?php
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require_once dirname(__FILE__) . '/ExpressionType.php';
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class ExpressionToken {
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private $subTree;
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private $expression;
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private $key;
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private $token;
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private $tokenType;
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private $trim;
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private $upper;
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private $noQuotes;
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public function __construct($key = "", $token = "") {
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$this->subTree = false;
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$this->expression = "";
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$this->key = $key;
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$this->token = $token;
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$this->tokenType = false;
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$this->trim = trim($token);
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$this->upper = strtoupper($this->trim);
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$this->noQuotes = null;
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}
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# TODO: we could replace it with a constructor new ExpressionToken(this, "*")
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public function addToken($string) {
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$this->token .= $string;
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}
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public function isEnclosedWithinParenthesis() {
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return ($this->upper[0] === '(' && substr($this->upper, -1) === ')');
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}
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public function setSubTree($tree) {
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$this->subTree = $tree;
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}
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public function getSubTree() {
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return $this->subTree;
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}
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public function getUpper($idx = false) {
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return $idx !== false ? $this->upper[$idx] : $this->upper;
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}
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public function getTrim($idx = false) {
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return $idx !== false ? $this->trim[$idx] : $this->trim;
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}
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public function getToken($idx = false) {
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return $idx !== false ? $this->token[$idx] : $this->token;
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}
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public function setNoQuotes($token, $qchars = '`') {
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$this->noQuotes = ($token === null) ? null : $this->revokeQuotation($token, $qchars);
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}
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public function setTokenType($type) {
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$this->tokenType = $type;
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}
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public function endsWith($needle) {
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$length = strlen($needle);
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if ($length == 0) {
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return true;
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}
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$start = $length * -1;
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return (substr($this->token, $start) === $needle);
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}
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public function isWhitespaceToken() {
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return ($this->trim === "");
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}
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public function isCommaToken() {
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return ($this->trim === ",");
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}
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public function isVariableToken() {
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return $this->upper[0] === '@';
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}
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public function isSubQueryToken() {
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return preg_match("/^\\(\\s*SELECT/i", $this->trim);
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}
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public function isExpression() {
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return $this->tokenType === ExpressionType::EXPRESSION;
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}
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public function isBracketExpression() {
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return $this->tokenType === ExpressionType::BRACKET_EXPRESSION;
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}
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public function isOperator() {
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return $this->tokenType === ExpressionType::OPERATOR;
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}
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public function isInList() {
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return $this->tokenType === ExpressionType::IN_LIST;
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}
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public function isFunction() {
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return $this->tokenType === ExpressionType::SIMPLE_FUNCTION;
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}
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public function isUnspecified() {
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return ($this->tokenType === false);
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}
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public function isVariable() {
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return $this->tokenType === ExpressionType::GLOBAL_VARIABLE || $this->tokenType === ExpressionType::LOCAL_VARIABLE || $this->tokenType === ExpressionType::USER_VARIABLE;
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}
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public function isAggregateFunction() {
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return $this->tokenType === ExpressionType::AGGREGATE_FUNCTION;
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}
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public function isColumnReference() {
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return $this->tokenType === ExpressionType::COLREF;
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}
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public function isConstant() {
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return $this->tokenType === ExpressionType::CONSTANT;
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}
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public function isSign() {
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return $this->tokenType === ExpressionType::SIGN;
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}
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public function isSubQuery() {
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return $this->tokenType === ExpressionType::SUBQUERY;
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}
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private function revokeQuotation($token, $qchars = '`') {
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$result = trim($token);
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for ($i = 0; $i < strlen($qchars); $i++) {
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$quote = $qchars[$i];
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if (($result[0] === $quote) && ($result[strlen($result) - 1] === $quote)) {
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$result = substr($result, 1, -1);
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return trim(str_replace($quote.$quote, $quote, $result));
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}
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}
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return $token;
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}
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public function toArray() {
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$result = array();
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$result['expr_type'] = $this->tokenType;
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$result['base_expr'] = $this->token;
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if (!empty($this->noQuotes)) {
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$result['no_quotes'] = $this->noQuotes;
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}
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$result['sub_tree'] = $this->subTree;
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return $result;
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}
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}
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?>
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