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Java > Open Source Codes > edu > rice > cs > drjava > model > definitions > reducedmodel > Free


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33
34 package edu.rice.cs.drjava.model.definitions.reducedmodel;
35
36 /**
37  * Shadowing state that indicates normal, unshadowed text.
38  * @version $Id: Free.java 3901 2006-06-30 05:28:11Z rcartwright $
39  */
40 public class Free extends ReducedModelState {
41   public static final Free ONLY = new Free();
42   
43   private Free() { }
44   
45   /**
46    * Walk function for when we're not inside a string or comment.
47    * Self-recursive and mutually recursive with other walk functions.
48    * <ol>
49    * <li> atEnd: return
50    * <li> If we find / *, * /, or / /, combine them into a single Brace,
51    * and keep the cursor on that Brace.
52    * <li> If current brace = //, go to next then call updateLineComment.<BR>
53    * If current brace = /*, go to next then call updateBlockComment.<BR>
54    * If current brace = ", go to next then call updateInsideDoubleQuote.<BR>
55    * Else, mark current brace as FREE, go to the next brace, and recur.
56    * </ol>
57    */
58   ReducedModelState update(TokenList.Iterator copyCursor) {
59     if (copyCursor.atEnd()) return STUTTER;
60     
61     _combineCurrentAndNextIfFind("/", "*", copyCursor);
62     _combineCurrentAndNextIfFind("/", "/", copyCursor);
63     _combineCurrentAndNextIfFind("","", copyCursor);
64     //if a / preceeds a /* or a // combine them.
65 _combineCurrentAndNextIfFind("/","/*",copyCursor);
66     _combineCurrentAndNextIfFind("/","//",copyCursor);
67     _combineCurrentAndNextIfEscape(copyCursor);
68  
69     String JavaDoc type = copyCursor.current().getType();
70     if (type.equals("*/")) {
71       copyCursor._splitCurrentIfCommentBlock(true,false);
72       copyCursor.prev();
73       return STUTTER;
74     }
75     else if (type.equals("//")) {
76       // open comment blocks are not set commented, they're set free
77 copyCursor.current().setState(FREE);
78       copyCursor.next();
79       return INSIDE_LINE_COMMENT;
80     }
81     else if (type.equals("/*")) {
82       // open comment blocks are not set commented, they're set free
83 copyCursor.current().setState(FREE);
84       copyCursor.next();
85       return INSIDE_BLOCK_COMMENT;
86     }
87     else if (type.equals("\'")) {
88       // make sure this is a OPEN single quote
89 if (copyCursor.current().isClosed()) {
90         copyCursor.current().flip();
91       }
92       copyCursor.current().setState(FREE);
93       copyCursor.next();
94       return INSIDE_SINGLE_QUOTE;
95     }
96     else if (type.equals("\"")) {
97       // make sure this is a OPEN quote
98 if (copyCursor.current().isClosed()) {
99         copyCursor.current().flip();
100       }
101       copyCursor.current().setState(FREE);
102       copyCursor.next();
103       return INSIDE_DOUBLE_QUOTE;
104     }
105     else {
106       copyCursor.current().setState(FREE);
107       copyCursor.next();
108       return FREE;
109     }
110   }
111 }
112
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