archive/net.sourceforge.phpeclipse.css.core/src/net/sourceforge/phpeclipse/css/core/internal/text/CssTextUtils.java

   1 /*
   2  * Copyright (c) 2003-2004 Christopher Lenz and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     Christopher Lenz - initial API and implementation
  10  *
  11  * $Id: CssTextUtils.java,v 1.1 2004-09-02 18:07:13 jsurfer Exp $
  12  */
  13
  14 package net.sourceforge.phpeclipse.css.core.internal.text;
  15
  16 import java.io.IOException;
  17
  18 import net.sourceforge.phpeclipse.css.core.CssCore;
  19
  20 import org.eclipse.jface.text.IDocument;
  21
  22 /**
  23  * Various utility methods for handling CSS source.
  24  *
  25  * TODO Probably refactor so this class isn't needed
  26  */
  27 public final class CssTextUtils {
  28
  29         // Constructors ------------------------------------------------------------
  30
  31         /**
  32          * Hidden.
  33          */
  34         private CssTextUtils() {
  35                 // Hidden
  36         }
  37
  38         // Public Methods ----------------------------------------------------------
  39
  40         public static int findMatchingClosingPeer(IDocument document, int offset,
  41                 char openingPeer) {
  42                 try {
  43                         CssCodeReader reader = new CssCodeReader(document, offset,
  44                                 document.getLength(), CssCodeReader.FORWARD);
  45                         char closingChar = getPeerCharacter(openingPeer);
  46                         int stack = 1;
  47                         int c = reader.read();
  48                         while (c != -1) {
  49                                 if ((c == openingPeer) && (c != closingChar)) {
  50                                         stack++;
  51                                 } else if (c == closingChar) {
  52                                         stack--;
  53                                 }
  54                                 if (stack == 0) {
  55                                         return reader.getOffset();
  56                                 }
  57                                 c = reader.read();
  58                         }
  59                 } catch (IOException e) {
  60                         CssCore.log(
  61                                 "Failed to find matching closing peer for '" + //$NON-NLS-1$
  62                                 openingPeer + '\'', e);
  63                 }
  64                 return -1;
  65         }
  66
  67         public static int findMatchingOpeningPeer(IDocument document, int offset,
  68                 char closingPeer) {
  69                 try {
  70                         CssCodeReader reader = new CssCodeReader(document, offset + 1,
  71                                 document.getLength(), CssCodeReader.BACKWARD);
  72                         char openingChar = getPeerCharacter(closingPeer);
  73                         int stack = 1;
  74                         int c = reader.read();
  75                         while (c != -1) {
  76                                 if ((c == closingPeer) && (c != openingChar)) {
  77                                         stack++;
  78                                 } else if (c == openingChar) {
  79                                         stack--;
  80                                 }
  81                                 if (stack == 0) {
  82                                         return reader.getOffset();
  83                                 }
  84                                 c = reader.read();
  85                         }
  86                 } catch (IOException e) {
  87                         CssCore.log(
  88                                 "Failed to find matching opening peer for '" + //$NON-NLS-1$
  89                                 closingPeer + '\'', e);
  90                 }
  91                 return  -1;
  92         }
  93
  94         public static char getPeerCharacter(char c) {
  95                 switch (c) {
  96                         case '{': return '}';
  97                         case '}': return '{';
  98                         case '[': return ']';
  99                         case ']': return '[';
 100                         case '(': return ')';
 101                         case ')': return '(';
 102                         case '"': return '"';
 103                         case '\'': return '\'';
 104                         default: return 0;
 105                 }
 106         }
 107
 108         public static boolean isCssIdentifierPart(char c) {
 109                 return ((c == '_') || Character.isLetterOrDigit(c) || (c == '-'));
 110         }
 111
 112         public static boolean isCssIdentifierStart(char c) {
 113                 return ((c == '_') || Character.isLetter(c));
 114         }
 115
 116         public static boolean isCssNumberPart(char c) {
 117                 return ((c == '.') || Character.isDigit(c));
 118         }
 119
 120         public static boolean isCssNumberStart(char c) {
 121                 return ((c == '-') || (c == '.') || Character.isDigit(c));
 122         }
 123
 124         public static boolean isCssWhitespace(char c) {
 125                 return Character.isWhitespace(c);
 126         }
 127
 128 }