Viewing file:  ExpressionParser.php (2.74 KB) -rwxr-xr-x
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<?php
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/**
* Implementation of the os-template / os-data expression language, which is based on the JSP EL syntax
* For reference on the language see:
* JSP EL: https://jsp.dev.java.net/spec/jsp-2_1-fr-spec-el.pdf
* OS Templates: http://opensocial-resources.googlecode.com/svn/spec/0.9/OpenSocial-Templating.xml
* OS Data pipelining: http://opensocial-resources.googlecode.com/svn/spec/0.9/OpenSocial-Data-Pipelining.xml
*
*/
require_once 'ExpLexer.php';
require_once 'ExpParser.php';
class ExpressionException extends Exception {
}
class ExpressionParser {
/**
* Evaluates the given $expression using the $dataContext as variable source.
*
* Internally the ExpressionParser uses a infix to postfix conversion to easily
* be able to evaluate mathematical expressions
*
* @param string $expression
* @param array $dataContext
* @return string evaluated result or an exception of failure
*/
public static function evaluate($expression, $dataContext) {
$outputTokens = ExpLexer::process($expression);
$result = ExpParser::parse($outputTokens, $dataContext);
return $result->value;
}
/**
* Misc function to convert an array to string, the reason a plain implode() doesn't
* always work is because it'll complain about array to string conversions if
* the array contains array's as entries
*
* @param $array
* @return string
*/
private static function arrayToString($array) {
foreach ($array as $key => $entry) {
if (is_array($entry)) {
$array[$key] = self::arrayToString($entry);
}
}
return implode(',', $array);
}
/**
* Returns the string value of the (mixed) $val, ie:
* on array, return "1, 2, 3, 4"
* on int, return "1"
* on string, return as is
*/
public static function stringValue($val) {
if (is_array($val)) {
return self::arrayToString($val);
} elseif (is_numeric($val)) {
return (string)$val;
} else {
return $val;
}
}
}
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