X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=core%2Fsrc%2Fde%2Fcongrace%2Fexp4j%2FParenthesisToken.java;fp=core%2Fsrc%2Fde%2Fcongrace%2Fexp4j%2FParenthesisToken.java;h=ad8ab0f6deec2f5754811b7f3316517e5c932c98;hb=9349577cdfdff682b2aabd6daa24fdc3a7449b58;hp=0000000000000000000000000000000000000000;hpb=30ba0a882f0c061176ba14dbf86d3d6fad096c02;p=debian%2Fopenrocket

diff --git a/core/src/de/congrace/exp4j/ParenthesisToken.java b/core/src/de/congrace/exp4j/ParenthesisToken.java
new file mode 100644
index 00000000..ad8ab0f6
--- /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();
+		}
+	}
+}