content: /*
   *  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
   *
   *      https://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.tools.ant.types.selectors;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStreamReader;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.Project;
  import org.apache.tools.ant.types.Parameter;
  import org.apache.tools.ant.types.RegularExpression;
  import org.apache.tools.ant.types.Resource;
  import org.apache.tools.ant.types.resources.FileResource;
  import org.apache.tools.ant.types.resources.selectors.ResourceSelector;
  import org.apache.tools.ant.util.regexp.Regexp;
  import org.apache.tools.ant.util.regexp.RegexpUtil;
  
  /**
   * Selector that filters files based on a regular expression.
   *
   * @since Ant 1.6
   */
  public class ContainsRegexpSelector extends BaseExtendSelector
          implements ResourceSelector {
  
      /** Key to used for parameterized custom selector */
      public static final String EXPRESSION_KEY = "expression";
      /** Parameter name for the casesensitive attribute. */
      private static final String CS_KEY = "casesensitive";
      /** Parameter name for the multiline attribute. */
      private static final String ML_KEY = "multiline";
      /** Parameter name for the singleline attribute. */
      private static final String SL_KEY = "singleline";
  
      private String userProvidedExpression = null;
      private RegularExpression myRegExp = null;
      private Regexp myExpression = null;
      private boolean caseSensitive = true;
      private boolean multiLine = false;
      private boolean singleLine = false;
  
      /**
       * @return a string describing this object
       */
      public String toString() {
          return String.format("{containsregexpselector expression: %s}",
              userProvidedExpression);
      }
  
      /**
       * The regular expression used to search the file.
       *
       * @param theexpression this must match a line in the file to be selected.
       */
      public void setExpression(String theexpression) {
          this.userProvidedExpression = theexpression;
      }
  
      /**
       * Whether to ignore case or not.
       * @param b if false, ignore case.
       * @since Ant 1.8.2
       */
      public void setCaseSensitive(boolean b) {
          caseSensitive = b;
      }
  
      /**
       * Whether to match should be multiline.
       * @param b the value to set.
       * @since Ant 1.8.2
       */
      public void setMultiLine(boolean b) {
          multiLine = b;
      }
  
      /**
       * Whether to treat input as singleline ('.' matches newline).
       * Corresponds to java.util.regex.Pattern.DOTALL.
       * @param b the value to set.
       * @since Ant 1.8.2
       */
      public void setSingleLine(boolean b) {
          singleLine = b;
      }
  
      /**
       * When using this as a custom selector, this method will be called.
       * It translates each parameter into the appropriate setXXX() call.
       *
       * @param parameters the complete set of parameters for this selector
       */
      public void setParameters(Parameter... parameters) {
          super.setParameters(parameters);
          if (parameters != null) {
              for (Parameter parameter : parameters) {
                  String paramname = parameter.getName();
                  if (EXPRESSION_KEY.equalsIgnoreCase(paramname)) {
                      setExpression(parameter.getValue());
                  } else if (CS_KEY.equalsIgnoreCase(paramname)) {
                      setCaseSensitive(Project.toBoolean(parameter.getValue()));
                  } else if (ML_KEY.equalsIgnoreCase(paramname)) {
                      setMultiLine(Project.toBoolean(parameter.getValue()));
                  } else if (SL_KEY.equalsIgnoreCase(paramname)) {
                      setSingleLine(Project.toBoolean(parameter.getValue()));
                  } else {
                      setError("Invalid parameter " + paramname);
                  }
              }
          }
      }
  
      /**
       * Checks that an expression was specified.
       *
       */
      public void verifySettings() {
          if (userProvidedExpression == null) {
              setError("The expression attribute is required");
          }
      }
  
      /**
       * Tests a regular expression against each line of text in the file.
       *
       * @param basedir the base directory the scan is being done from
       * @param filename is the name of the file to check
       * @param file is a java.io.File object the selector can use
       * @return whether the file should be selected or not
       */
      public boolean isSelected(File basedir, String filename, File file) {
          return isSelected(new FileResource(file));
      }
  
      /**
       * Tests a regular expression against each line of text in a Resource.
       *
       * @param r the Resource to check.
       * @return whether the Resource is selected or not
       */
      public boolean isSelected(Resource r) {
          // throw BuildException on error
          validate();
  
          if (r.isDirectory()) {
              return true;
          }
  
          if (myRegExp == null) {
              myRegExp = new RegularExpression();
              myRegExp.setPattern(userProvidedExpression);
              myExpression = myRegExp.getRegexp(getProject());
          }
  
          try (BufferedReader in =
              new BufferedReader(new InputStreamReader(r.getInputStream()))) {
              try {
                  String teststr = in.readLine();
  
                  while (teststr != null) {
                      if (myExpression.matches(teststr, RegexpUtil
                          .asOptions(caseSensitive, multiLine, singleLine))) {
                          return true;
                      }
                      teststr = in.readLine();
                  }
                  return false;
              } catch (IOException ioe) {
                  throw new BuildException("Could not read " + r.toLongString());
              }
          } catch (IOException e) {
              throw new BuildException(
                  "Could not get InputStream from " + r.toLongString(), e);
          }
      }
  }
  