bundles/org.simantics.basicexpression/src/org/simantics/basicexpression/Expressions.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.basicexpression;\r
  13 \r
  14 import java.io.PushbackReader;\r
  15 import java.io.StringReader;\r
  16 \r
  17 import org.simantics.basicexpression.analysis.DepthFirstAdapter;\r
  18 import org.simantics.basicexpression.lexer.Lexer;\r
  19 import org.simantics.basicexpression.node.Start;\r
  20 import org.simantics.basicexpression.parser.Parser;\r
  21 \r
  22 public class Expressions {\r
  23 \r
  24         private static final boolean DEBUG = false;\r
  25         \r
  26     public static void evaluate(String expression, DepthFirstAdapter evaluator) {\r
  27         \r
  28         try\r
  29         {\r
  30             // Create a Parser instance.\r
  31             Parser p =\r
  32                 new Parser(\r
  33                         new Lexer(\r
  34                                 new PushbackReader(new StringReader(expression))));\r
  35 \r
  36             // Parse the input.\r
  37             Start tree = p.parse();\r
  38             \r
  39             if(DEBUG)\r
  40                 tree.apply(new PrettyPrintExpressionVisitor());\r
  41             \r
  42 //            System.out.println("tree=" + tree.getClass().getName());\r
  43             \r
  44             // Apply the translation.\r
  45             tree.apply(evaluator);\r
  46 \r
  47         }\r
  48         catch(Exception e)\r
  49         {\r
  50                 e.printStackTrace();\r
  51                 evaluator.except(e);\r
  52         }        \r
  53         \r
  54     }\r
  55 \r
  56 }\r