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Initial Arduino IDE based on Processing.

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David A. Mellis
2005-08-25 21:06:28 +00:00
commit 9fc5aa63f6
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app/syntax/TextUtilities.java Normal file
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/*
* TextUtilities.java - Utility functions used by the text area classes
* Copyright (C) 1999 Slava Pestov
*
* You may use and modify this package for any purpose. Redistribution is
* permitted, in both source and binary form, provided that this notice
* remains intact in all source distributions of this package.
*/
package processing.app.syntax;
import javax.swing.text.*;
/**
* Class with several utility functions used by the text area component.
* @author Slava Pestov
* @version $Id: TextUtilities.java,v 1.1 2005/04/09 02:30:37 benfry Exp $
*/
public class TextUtilities
{
/**
* Returns the offset of the bracket matching the one at the
* specified offset of the document, or -1 if the bracket is
* unmatched (or if the character is not a bracket).
* @param doc The document
* @param offset The offset
* @exception BadLocationException If an out-of-bounds access
* was attempted on the document text
*/
public static int findMatchingBracket(Document doc, int offset)
throws BadLocationException
{
if(doc.getLength() == 0)
return -1;
char c = doc.getText(offset,1).charAt(0);
char cprime; // c` - corresponding character
boolean direction; // true = back, false = forward
switch(c)
{
case '(': cprime = ')'; direction = false; break;
case ')': cprime = '('; direction = true; break;
case '[': cprime = ']'; direction = false; break;
case ']': cprime = '['; direction = true; break;
case '{': cprime = '}'; direction = false; break;
case '}': cprime = '{'; direction = true; break;
default: return -1;
}
int count;
// How to merge these two cases is left as an exercise
// for the reader.
// Go back or forward
if(direction)
{
// Count is 1 initially because we have already
// `found' one closing bracket
count = 1;
// Get text[0,offset-1];
String text = doc.getText(0,offset);
// Scan backwards
for(int i = offset - 1; i >= 0; i--)
{
// If text[i] == c, we have found another
// closing bracket, therefore we will need
// two opening brackets to complete the
// match.
char x = text.charAt(i);
if(x == c)
count++;
// If text[i] == cprime, we have found a
// opening bracket, so we return i if
// --count == 0
else if(x == cprime)
{
if(--count == 0)
return i;
}
}
}
else
{
// Count is 1 initially because we have already
// `found' one opening bracket
count = 1;
// So we don't have to + 1 in every loop
offset++;
// Number of characters to check
int len = doc.getLength() - offset;
// Get text[offset+1,len];
String text = doc.getText(offset,len);
// Scan forwards
for(int i = 0; i < len; i++)
{
// If text[i] == c, we have found another
// opening bracket, therefore we will need
// two closing brackets to complete the
// match.
char x = text.charAt(i);
if(x == c)
count++;
// If text[i] == cprime, we have found an
// closing bracket, so we return i if
// --count == 0
else if(x == cprime)
{
if(--count == 0)
return i + offset;
}
}
}
// Nothing found
return -1;
}
/**
* Locates the start of the word at the specified position.
* @param line The text
* @param pos The position
*/
public static int findWordStart(String line, int pos, String noWordSep)
{
char ch = line.charAt(pos - 1);
if(noWordSep == null)
noWordSep = "";
boolean selectNoLetter = (!Character.isLetterOrDigit(ch)
&& noWordSep.indexOf(ch) == -1);
int wordStart = 0;
for(int i = pos - 1; i >= 0; i--)
{
ch = line.charAt(i);
if(selectNoLetter ^ (!Character.isLetterOrDigit(ch) &&
noWordSep.indexOf(ch) == -1))
{
wordStart = i + 1;
break;
}
}
return wordStart;
}
/**
* Locates the end of the word at the specified position.
* @param line The text
* @param pos The position
*/
public static int findWordEnd(String line, int pos, String noWordSep)
{
char ch = line.charAt(pos);
if(noWordSep == null)
noWordSep = "";
boolean selectNoLetter = (!Character.isLetterOrDigit(ch)
&& noWordSep.indexOf(ch) == -1);
int wordEnd = line.length();
for(int i = pos; i < line.length(); i++)
{
ch = line.charAt(i);
if(selectNoLetter ^ (!Character.isLetterOrDigit(ch) &&
noWordSep.indexOf(ch) == -1))
{
wordEnd = i;
break;
}
}
return wordEnd;
}
}