--- /dev/null
+/*
+ Copyright 2011 frank asseg
+
+ Licensed 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.
+
+ */
+package de.congrace.exp4j;
+
+/**
+ * Simple commandline interpreter for mathematical expressions the interpreter
+ * takes a mathematical expressions as a {@link String} argument, evaluates it
+ * and prints out the result.
+ *
+ *
+ * <pre>
+ * java de.congrace.exp4j.CommandlineInterpreter "2 * log(2.2223) - ((2-3.221) * 14.232^2)"
+ * > 248.91042049521056
+ * </pre>
+ *
+ * @author fas@congrace.de
+ *
+ */
+public class CommandlineInterpreter {
+ private static void calculateExpression(String string) {
+ try {
+ final PostfixExpression pe = PostfixExpression.fromInfix(string);
+ System.out.println(pe.calculate());
+ } catch (UnparsableExpressionException e) {
+ e.printStackTrace();
+ } catch (UnknownFunctionException e) {
+ e.printStackTrace();
+ }
+ }
+
+ public static void main(String[] args) {
+ if (args.length != 1) {
+ printUsage();
+ } else {
+ calculateExpression(args[0]);
+ }
+ }
+
+ private static void printUsage() {
+ final StringBuilder usage = new StringBuilder();
+ usage.append("Commandline Expression Parser\n\n").append("Example: ").append("\n").append("java -jar exp4j.jar \"2.12 * log(23) * (12 - 4)\"\n\n")
+ .append("written by fas@congrace.de");
+ System.err.println(usage.toString());
+ }
+}