Merge commit '42b2e5ca519766e37ce6941ba4faecc9691cc403' into upstream

[debian/openrocket] / core / src / de / congrace / exp4j / ParenthesisToken.java

diff --git a/core/src/de/congrace/exp4j/ParenthesisToken.java b/core/src/de/congrace/exp4j/ParenthesisToken.java
new file mode 100644 (file)
index 0000000..ad8ab0f
--- /dev/null
+++ b/core/src/de/congrace/exp4j/ParenthesisToken.java
@@ -0,0 +1,69 @@
+/*
+   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;
+
+import java.util.Stack;
+
+/**
+ * Token for parenthesis
+ * 
+ * @author fas@congrace.de
+ */
+class ParenthesisToken extends Token {
+
+       ParenthesisToken(String value) {
+               super(value);
+       }
+
+       @Override
+       public boolean equals(Object obj) {
+               if (obj instanceof ParenthesisToken) {
+                       final ParenthesisToken t = (ParenthesisToken) obj;
+                       return t.getValue().equals(this.getValue());
+               }
+               return false;
+       }
+
+       @Override
+       public int hashCode() {
+               return getValue().hashCode();
+       }
+
+       /**
+        * check the direction of the parenthesis
+        * 
+        * @return true if it's a left parenthesis (open) false if it is a right
+        *         parenthesis (closed)
+        */
+       boolean isOpen() {
+               return getValue().equals("(") || getValue().equals("[") || getValue().equals("{");
+       }
+
+       @Override
+       void mutateStackForInfixTranslation(Stack<Token> operatorStack, StringBuilder output) {
+               if (this.isOpen()) {
+                       operatorStack.push(this);
+               } else {
+                       Token next;
+                       while ((next = operatorStack.peek()) instanceof OperatorToken || next instanceof FunctionToken || next instanceof CustomFunction
+                                       || (next instanceof ParenthesisToken && !((ParenthesisToken) next).isOpen())) {
+                               output.append(operatorStack.pop().getValue()).append(" ");
+                       }
+                       operatorStack.pop();
+               }
+       }
+}