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    1   /*
    2   $Id: ShellCompleter.java,v 1.3 2005/04/12 16:38:42 jstrachan Exp $
    3
    4   Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
    5
    6   Redistribution and use of this software and associated documentation
    7   ("Software"), with or without modification, are permitted provided
    8   that the following conditions are met:
    9
    10  1. Redistributions of source code must retain copyright
    11     statements and notices.  Redistributions must also contain a
    12     copy of this document.
    13
    14  2. Redistributions in binary form must reproduce the
    15     above copyright notice, this list of conditions and the
    16     following disclaimer in the documentation and/or other
    17     materials provided with the distribution.
    18
    19  3. The name "groovy" must not be used to endorse or promote
    20     products derived from this Software without prior written
    21     permission of The Codehaus.  For written permission,
    22     please contact info@codehaus.org.
    23
    24  4. Products derived from this Software may not be called "groovy"
    25     nor may "groovy" appear in their names without prior written
    26     permission of The Codehaus. "groovy" is a registered
    27     trademark of The Codehaus.
    28
    29  5. Due credit should be given to The Codehaus -
    30     http://groovy.codehaus.org/
    31
    32  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
    33  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
    34  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
    35  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
    36  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
    37  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    38  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    39  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    40  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    41  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    42  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    43  OF THE POSSIBILITY OF SUCH DAMAGE.
    44
    45  */
    46  package groovy.ui;
    47
    48  import groovy.lang.GroovyShell;
    49  import groovy.lang.MetaMethod;
    50  import org.codehaus.groovy.sandbox.ui.Completer;
    51
    52  import java.util.ArrayList;
    53  import java.util.Iterator;
    54  import java.util.List;
    55  import java.util.Set;
    56
    57  /***
    58   * Readline completion for InteractiveShell.
    59   *
    60   * @author Yuri Schimke
    61   * @version $Revision: 1.3 $
    62   */
    63  public class ShellCompleter implements Completer {
    64      // The shell being handled
    65      private GroovyShell shell;
    66      private List completions = new ArrayList();
    67
    68      public ShellCompleter(GroovyShell shell) {
    69          this.shell = shell;
    70      }
    71
    72      // @TODO add optimisations like check for . and rule out variables etc
    73      public List findCompletions(String token) {
    74          completions.clear();
    75
    76          if (token.length() == 0) {
    77              return completions;
    78          }
    79
    80          // completions of local variable names
    81          findLocalVariables(token);
    82
    83          // completions of local fields.
    84
    85          // completions of local methods
    86          findShellMethods(token);
    87
    88          // completions of methods invoked on a target
    89          //findTargetCompletions(complete);
    90
    91          // completion of keywords.
    92
    93          return completions;
    94      }
    95
    96      private void findShellMethods(String complete) {
    97          List methods = shell.getMetaClass().getMetaMethods();
    98          for (Iterator i = methods.iterator(); i.hasNext();) {
    99              MetaMethod method = (MetaMethod) i.next();
    100             if (method.getName().startsWith(complete)) {
    101                 if (method.getParameterTypes().length > 0) {
    102                     completions.add(method.getName() + "(");
    103                 }
    104                 else {
    105                     completions.add(method.getName() + "()");
    106                 }
    107             }
    108         }
    109     }
    110
    111     private void findLocalVariables(String complete) {
    112         Set names = shell.getContext().getVariables().keySet();
    113
    114         for (Iterator i = names.iterator(); i.hasNext();) {
    115             String name = (String) i.next();
    116             if (name.startsWith(complete)) {
    117                 completions.add(name);
    118             }
    119         }
    120     }
    121 }