svn-gvsig-desktop / tags / v1_0_2_Build_915 / libraries / libIverUtiles / src / com / iver / utiles / console / jedit / TextUtilities.java @ 12217
History | View | Annotate | Download (4.32 KB)
1 |
package com.iver.utiles.console.jedit; |
---|---|
2 |
/*
|
3 |
* TextUtilities.java - Utility functions used by the text area classes
|
4 |
* Copyright (C) 1999 Slava Pestov
|
5 |
*
|
6 |
* You may use and modify this package for any purpose. Redistribution is
|
7 |
* permitted, in both source and binary form, provided that this notice
|
8 |
* remains intact in all source distributions of this package.
|
9 |
*/
|
10 |
|
11 |
import javax.swing.text.BadLocationException; |
12 |
import javax.swing.text.Document; |
13 |
|
14 |
/**
|
15 |
* Class with several utility functions used by the text area component.
|
16 |
* @author Slava Pestov
|
17 |
* @version $Id$
|
18 |
*/
|
19 |
public class TextUtilities |
20 |
{ |
21 |
/**
|
22 |
* Returns the offset of the bracket matching the one at the
|
23 |
* specified offset of the document, or -1 if the bracket is
|
24 |
* unmatched (or if the character is not a bracket).
|
25 |
* @param doc The document
|
26 |
* @param offset The offset
|
27 |
* @exception BadLocationException If an out-of-bounds access
|
28 |
* was attempted on the document text
|
29 |
*/
|
30 |
public static int findMatchingBracket(Document doc, int offset) |
31 |
throws BadLocationException |
32 |
{ |
33 |
if(doc.getLength() == 0) |
34 |
return -1; |
35 |
char c = doc.getText(offset,1).charAt(0); |
36 |
char cprime; // c` - corresponding character |
37 |
boolean direction; // true = back, false = forward |
38 |
|
39 |
switch(c)
|
40 |
{ |
41 |
case '(': cprime = ')'; direction = false; break; |
42 |
case ')': cprime = '('; direction = true; break; |
43 |
case '[': cprime = ']'; direction = false; break; |
44 |
case ']': cprime = '['; direction = true; break; |
45 |
case '{': cprime = '}'; direction = false; break; |
46 |
case '}': cprime = '{'; direction = true; break; |
47 |
default: return -1; |
48 |
} |
49 |
|
50 |
int count;
|
51 |
|
52 |
// How to merge these two cases is left as an exercise
|
53 |
// for the reader.
|
54 |
|
55 |
// Go back or forward
|
56 |
if(direction)
|
57 |
{ |
58 |
// Count is 1 initially because we have already
|
59 |
// `found' one closing bracket
|
60 |
count = 1;
|
61 |
|
62 |
// Get text[0,offset-1];
|
63 |
String text = doc.getText(0,offset); |
64 |
|
65 |
// Scan backwards
|
66 |
for(int i = offset - 1; i >= 0; i--) |
67 |
{ |
68 |
// If text[i] == c, we have found another
|
69 |
// closing bracket, therefore we will need
|
70 |
// two opening brackets to complete the
|
71 |
// match.
|
72 |
char x = text.charAt(i);
|
73 |
if(x == c)
|
74 |
count++; |
75 |
|
76 |
// If text[i] == cprime, we have found a
|
77 |
// opening bracket, so we return i if
|
78 |
// --count == 0
|
79 |
else if(x == cprime) |
80 |
{ |
81 |
if(--count == 0) |
82 |
return i;
|
83 |
} |
84 |
} |
85 |
} |
86 |
else
|
87 |
{ |
88 |
// Count is 1 initially because we have already
|
89 |
// `found' one opening bracket
|
90 |
count = 1;
|
91 |
|
92 |
// So we don't have to + 1 in every loop
|
93 |
offset++; |
94 |
|
95 |
// Number of characters to check
|
96 |
int len = doc.getLength() - offset;
|
97 |
|
98 |
// Get text[offset+1,len];
|
99 |
String text = doc.getText(offset,len);
|
100 |
|
101 |
// Scan forwards
|
102 |
for(int i = 0; i < len; i++) |
103 |
{ |
104 |
// If text[i] == c, we have found another
|
105 |
// opening bracket, therefore we will need
|
106 |
// two closing brackets to complete the
|
107 |
// match.
|
108 |
char x = text.charAt(i);
|
109 |
|
110 |
if(x == c)
|
111 |
count++; |
112 |
|
113 |
// If text[i] == cprime, we have found an
|
114 |
// closing bracket, so we return i if
|
115 |
// --count == 0
|
116 |
else if(x == cprime) |
117 |
{ |
118 |
if(--count == 0) |
119 |
return i + offset;
|
120 |
} |
121 |
} |
122 |
} |
123 |
|
124 |
// Nothing found
|
125 |
return -1; |
126 |
} |
127 |
|
128 |
/**
|
129 |
* Locates the start of the word at the specified position.
|
130 |
* @param line The text
|
131 |
* @param pos The position
|
132 |
*/
|
133 |
public static int findWordStart(String line, int pos, String noWordSep) |
134 |
{ |
135 |
char ch = line.charAt(pos - 1); |
136 |
|
137 |
if(noWordSep == null) |
138 |
noWordSep = "";
|
139 |
boolean selectNoLetter = (!Character.isLetterOrDigit(ch) |
140 |
&& noWordSep.indexOf(ch) == -1);
|
141 |
|
142 |
int wordStart = 0; |
143 |
for(int i = pos - 1; i >= 0; i--) |
144 |
{ |
145 |
ch = line.charAt(i); |
146 |
if(selectNoLetter ^ (!Character.isLetterOrDigit(ch) && |
147 |
noWordSep.indexOf(ch) == -1))
|
148 |
{ |
149 |
wordStart = i + 1;
|
150 |
break;
|
151 |
} |
152 |
} |
153 |
|
154 |
return wordStart;
|
155 |
} |
156 |
|
157 |
/**
|
158 |
* Locates the end of the word at the specified position.
|
159 |
* @param line The text
|
160 |
* @param pos The position
|
161 |
*/
|
162 |
public static int findWordEnd(String line, int pos, String noWordSep) |
163 |
{ |
164 |
char ch = line.charAt(pos);
|
165 |
|
166 |
if(noWordSep == null) |
167 |
noWordSep = "";
|
168 |
boolean selectNoLetter = (!Character.isLetterOrDigit(ch) |
169 |
&& noWordSep.indexOf(ch) == -1);
|
170 |
|
171 |
int wordEnd = line.length();
|
172 |
for(int i = pos; i < line.length(); i++) |
173 |
{ |
174 |
ch = line.charAt(i); |
175 |
if(selectNoLetter ^ (!Character.isLetterOrDigit(ch) && |
176 |
noWordSep.indexOf(ch) == -1))
|
177 |
{ |
178 |
wordEnd = i; |
179 |
break;
|
180 |
} |
181 |
} |
182 |
return wordEnd;
|
183 |
} |
184 |
} |