add LogicalOperationEvaluator
git-svn-id: https://svn.apache.org/repos/asf/ant/antlibs/props/trunk@916861 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/org/apache/ant/props/LogicalOperationEvaluator.java b/src/main/org/apache/ant/props/LogicalOperationEvaluator.java
new file mode 100644
index 0000000..fa414af
--- /dev/null
+++ b/src/main/org/apache/ant/props/LogicalOperationEvaluator.java
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.ant.props;
+
+import java.util.regex.Pattern;
+
+import org.apache.tools.ant.PropertyHelper;
+import org.apache.tools.ant.PropertyHelper.PropertyEvaluator;
+
+/**
+ * {@link PropertyEvaluator} that processes combinations of <code>!</code>,
+ * <code>&</code> (<code>+</code> is also accepted for XML ease-of-use),
+ * <code>^</code> (XOR), and <code>|</code>, in descending priority.
+ * Probably only useful when used with {@link NestedPropertyExpander} which, when
+ * taken in conjunction with {@link ConditionTypeEvaluator}, will resolve nested
+ * conditions to <code>true</code> or <code>false</code>, allowing them to be
+ * processed by this little fellow.
+ *
+ * Grouping can be accomplished by means of nested property expressions.
+ */
+public class LogicalOperationEvaluator extends RegexBasedEvaluator {
+ private static final String BOOL = "(?:true|false)";
+ private static final String NEGATED_BOOL = "!" + BOOL;
+ private static final String EXPR = "(?:" + BOOL + "|" + NEGATED_BOOL + ")";
+ private static final String AND = "[\\s]*(?:&|\\+)[\\s]*";
+ private static final Pattern AND_PATTERN = Pattern.compile(AND);
+ private static final String XOR = "[\\s]*\\^[\\s]*";
+ private static final Pattern XOR_PATTERN = Pattern.compile(XOR);
+ private static final String OR = "[\\s]*\\|[\\s]*";
+ private static final Pattern OR_PATTERN = Pattern.compile(OR);
+ private static final String OP = "(?:" + AND + "|" + XOR + "|" + OR + ")" + EXPR;
+
+ // we accept a pattern of either EXPR OP EXPR (OP EXPR)* | NEGATED_BOOL (without op)
+ private static final String PATTERN = "^" + "(?:" + EXPR + OP + "(?:" + OP + ")*)|"
+ + NEGATED_BOOL + "$";
+
+ /**
+ * Create a new LogicalOperationEvaluator instance.
+ */
+ public LogicalOperationEvaluator() {
+ super(PATTERN);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ protected Object evaluate(String[] groups, PropertyHelper propertyHelper) {
+ boolean result = false;
+ String[] or = OR_PATTERN.split(groups[0]);
+ for (int o = 0; !result && o < or.length; o++) {
+ boolean accumXor = false;
+ String[] xor = XOR_PATTERN.split(or[o]);
+ for (int x = 0; x < xor.length; x++) {
+ boolean accumAnd = true;
+ String[] and = AND_PATTERN.split(xor[x]);
+ for (int a = 0; accumAnd && a < and.length; a++) {
+ boolean negate = false;
+ String expr = and[a];
+ if (expr.charAt(0) == '!') {
+ negate = true;
+ expr = expr.substring(1);
+ }
+ boolean b = Boolean.valueOf(expr.trim().toLowerCase()).booleanValue() ^ negate;
+ accumAnd &= b;
+ }
+ accumXor ^= accumAnd;
+ }
+ result |= accumXor;
+ }
+ return Boolean.valueOf(result);
+ }
+}
diff --git a/src/tests/antunit/logical-ops-test.xml b/src/tests/antunit/logical-ops-test.xml
new file mode 100644
index 0000000..f2a2ae0
--- /dev/null
+++ b/src/tests/antunit/logical-ops-test.xml
@@ -0,0 +1,216 @@
+<?xml version="1.0"?>
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You 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.
+-->
+<project xmlns:au="antlib:org.apache.ant.antunit"
+ xmlns:props="antlib:org.apache.ant.props" default="antunit">
+
+ <typedef name="logical-ops" classname="org.apache.ant.props.LogicalOperationEvaluator" />
+ <logical-ops id="logical-ops" />
+
+ <propertyhelper>
+ <delegate refid="logical-ops" />
+ <props:nested />
+ </propertyhelper>
+
+ <target name="antunit">
+ <antunit xmlns="antlib:org.apache.ant.antunit">
+ <plainlistener />
+ <file file="${ant.file}" xmlns="antlib:org.apache.tools.ant" />
+ </antunit>
+ </target>
+
+ <target name="test-amp">
+ <au:assertTrue>
+ <istrue value="${true & true}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${false & true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${false & false}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${true & false}" />
+ </au:assertFalse>
+ </target>
+
+ <target name="test-plus">
+ <au:assertTrue>
+ <istrue value="${true + true}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${true + false}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${false + false}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${false + true}" />
+ </au:assertFalse>
+ </target>
+
+ <target name="test-xor">
+ <au:assertTrue>
+ <istrue value="${true ^ false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${false ^ true}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${true ^ true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${false ^ false}" />
+ </au:assertFalse>
+ </target>
+
+ <target name="test-or">
+ <au:assertTrue>
+ <istrue value="${true | false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true | true}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${false | true}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${false | false}" />
+ </au:assertFalse>
+ </target>
+
+ <target name="test-multi-amp">
+ <au:assertTrue>
+ <istrue value="${true & true & true & true}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${false & true & true & true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${true & false & true & true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${true & true & false & true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${true & true & true & false}" />
+ </au:assertFalse>
+ </target>
+
+ <target name="test-multi-plus">
+ <au:assertTrue>
+ <istrue value="${true + true + true + true}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${false + true + true + true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${true + false + true + true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${true + true + false + true}" />
+ </au:assertFalse>
+ <au:assertFalse>
+ <istrue value="${true + true + true + false}" />
+ </au:assertFalse>
+ </target>
+
+ <target name="test-multi-xor">
+ <au:assertFalse>
+ <!-- true ^ false == true, ^ true == false, ^ false == false -->
+ <istrue value="${true ^ false ^ true ^ false}" />
+ </au:assertFalse>
+ <au:assertTrue>
+ <!-- true ^ false == true, ^ false == true, ^ false == true -->
+ <istrue value="${true ^ false ^ false ^ false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <!-- false ^ true == true, ^ false == true, ^ false == true -->
+ <istrue value="${false ^ true ^ false ^ false}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${false ^ false ^ false ^ false}" />
+ </au:assertFalse>
+ <au:assertTrue>
+ <istrue value="${false ^ false ^ false ^ true}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true ^ false ^ true ^ true}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true ^ true ^ true ^ true ^ true}" />
+ </au:assertTrue>
+ </target>
+
+ <target name="test-multi-or">
+ <au:assertTrue>
+ <istrue value="${false | true | false | false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true | false | false | false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${false | false | false | true}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${false | false | true | false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true | false | true | false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true | true | true | false}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true | true | true | false}" />
+ </au:assertTrue>
+ </target>
+
+ <target name="test-precedence">
+ <au:assertTrue>
+ <istrue value="${true | false + true}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${true + false | true}" />
+ </au:assertTrue>
+ <au:assertTrue>
+ <istrue value="${false + true ^ true | true + false}" />
+ </au:assertTrue>
+ </target>
+
+ <target name="test-negation">
+ <au:assertTrue>
+ <istrue value="${!false}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${!true}" />
+ </au:assertFalse>
+ </target>
+
+ <target name="test-nested-negation">
+ <propertyhelper>
+ <props:stringops />
+ </propertyhelper>
+ <au:assertTrue>
+ <istrue value="${!${foo:-false}}" />
+ </au:assertTrue>
+ <au:assertFalse>
+ <istrue value="${!${foo:-true}}" />
+ </au:assertFalse>
+ </target>
+
+</project>
