Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.basicexpression / src / org / simantics / basicexpression / Expressions.java

diff --git a/bundles/org.simantics.basicexpression/src/org/simantics/basicexpression/Expressions.java b/bundles/org.simantics.basicexpression/src/org/simantics/basicexpression/Expressions.java
new file mode 100644 (file)
index 0000000..a3e4ff5
--- /dev/null
+++ b/bundles/org.simantics.basicexpression/src/org/simantics/basicexpression/Expressions.java
@@ -0,0 +1,56 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.basicexpression;\r
+\r
+import java.io.PushbackReader;\r
+import java.io.StringReader;\r
+\r
+import org.simantics.basicexpression.analysis.DepthFirstAdapter;\r
+import org.simantics.basicexpression.lexer.Lexer;\r
+import org.simantics.basicexpression.node.Start;\r
+import org.simantics.basicexpression.parser.Parser;\r
+\r
+public class Expressions {\r
+\r
+       private static final boolean DEBUG = false;\r
+       \r
+    public static void evaluate(String expression, DepthFirstAdapter evaluator) {\r
+        \r
+        try\r
+        {\r
+            // Create a Parser instance.\r
+            Parser p =\r
+                new Parser(\r
+                        new Lexer(\r
+                                new PushbackReader(new StringReader(expression))));\r
+\r
+            // Parse the input.\r
+            Start tree = p.parse();\r
+            \r
+            if(DEBUG)\r
+               tree.apply(new PrettyPrintExpressionVisitor());\r
+            \r
+//            System.out.println("tree=" + tree.getClass().getName());\r
+            \r
+            // Apply the translation.\r
+            tree.apply(evaluator);\r
+\r
+        }\r
+        catch(Exception e)\r
+        {\r
+               e.printStackTrace();\r
+               evaluator.except(e);\r
+        }        \r
+        \r
+    }\r
+\r
+}\r