Source Code Cross Referenced for CharSet.java in  » Science » javolution-5.2 » javolution » text » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » javolution 5.2 » javolution.text 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
003:         * Copyright (C) 2006 - Javolution (http://javolution.org/)
004:         * All rights reserved.
005:         * 
006:         * Permission to use, copy, modify, and distribute this software is
007:         * freely granted, provided that this notice is preserved.
008:         */
009:        package javolution.text;
010:
011:        import javolution.lang.Immutable;
012:        import javolution.lang.MathLib;
013:
014:        /**
015:         * <p> This class represents a set of characters.</p>
016:         * <p> Instances of this class are typically used for parsing purpose
017:         *     (faster than regular expressions for simple patterns). For example:[code]
018:         *     // Integration with Text.
019:         *     Text number;
020:         *     int exponentIndex = num.indexOfAny(CharSet.valueOf('e', 'E'));
021:         *     
022:         *     // Integration with TextFormat.
023:         *     public List<Integer> parse(CharSequence csq, TextFormat.Cursor cursor) {
024:         *         FastTable<Integer> numbers = FastTable.newInstance();
025:         *         while (cursor.skip(CharSet.WHITESPACES, csq)) {
026:         *             numbers.add(TypeFormat.parseInt(csq, cursor));
027:         *         }
028:         *         return numbers;
029:         *     }
030:         *     [/code]   
031:         * 
032:         * @author  <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
033:         * @version 3.7, January 1, 2006
034:         */
035:        public final class CharSet implements  Immutable {
036:
037:            /**
038:             * Represents an empty character set.
039:             */
040:            public static final CharSet EMPTY = new CharSet(new long[0]);
041:
042:            /**
043:             * Represents white spaces characters according to Java 
044:             * (see {@link Character#isWhitespace(char)}).
045:             */
046:            public static final CharSet WHITESPACES = CharSet
047:                    .valueOf(new char[] { 0x9, 0xA, 0xB, 0xC, 0xD, 0x1C, 0x1D,
048:                            0x1E, 0x1F, 0x20, 0x1680, 0x180E, 0x2000, 0x2001,
049:                            0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2008,
050:                            0x2009, 0x200A, 0x200B, 0x2028, 0x2029, 0x205F,
051:                            0x3000 });
052:
053:            /**
054:             * Represents spaces characters according to Java 
055:             * (see {@link Character#isSpaceChar(char)}).
056:             */
057:            public static final CharSet SPACES = CharSet.valueOf(new char[] {
058:                    0x20, 0xA0, 0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003,
059:                    0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A,
060:                    0x200B, 0x2028, 0x2029, 0x202F, 0x205F, 0x3000 });
061:
062:            /**
063:             * Represents ISO control  characters according to Java 
064:             * (see {@link Character#isISOControl(char)}).
065:             */
066:            public static final CharSet ISO_CONTROLS = CharSet
067:                    .valueOf(new char[] { 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6,
068:                            0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF, 0x10,
069:                            0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
070:                            0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x7F,
071:                            0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
072:                            0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
073:                            0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
074:                            0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F });
075:
076:            /**
077:             * Holds the containment mapping.  
078:             */
079:            private final long[] _mapping;
080:
081:            /**
082:             * Creates a character set with the specified mapping.
083:             * 
084:             * @param mapping the character set mapping.
085:             */
086:            private CharSet(long[] mapping) {
087:                _mapping = mapping;
088:            }
089:
090:            /**
091:             * Returns the character set holding the specified characters.
092:             * 
093:             * @param chars the characters contained by this character set.
094:             * @return the corresponding character set.
095:             */
096:            public static CharSet valueOf(char[]/*...*/chars) {
097:                int maxChar = 0;
098:                for (int i = chars.length; --i >= 0;) {
099:                    if (chars[i] > maxChar) {
100:                        maxChar = chars[i];
101:                    }
102:                }
103:                CharSet charSet = new CharSet(new long[(maxChar >> 6) + 1]);
104:                for (int i = chars.length; --i >= 0;) {
105:                    char c = chars[i];
106:                    charSet._mapping[c >> 6] |= 1L << (c & 63);
107:                }
108:                return charSet;
109:            }
110:
111:            /**
112:             * Returns the character set holding the characters in the specified 
113:             * range.
114:             * 
115:             * @param first the first character.
116:             * @param last the last character.
117:             * @return the corresponding character set.
118:             * @throws IllegalArgumentException if <code>first > last</code>
119:             */
120:            public static CharSet rangeOf(char first, char last) {
121:                if (first > last)
122:                    throw new IllegalArgumentException(
123:                            "first should be less or equal to last");
124:                CharSet charSet = new CharSet(new long[(last >> 6) + 1]);
125:                for (char c = first; c <= last; c++) {
126:                    charSet._mapping[c >> 6] |= 1L << (c & 63);
127:                }
128:                return charSet;
129:
130:            }
131:
132:            /**
133:             * Indicates if the specified character is contained by this character set.
134:             * 
135:             * @param c the character to test.
136:             * @return <code>true</code> if this character set contains the specified
137:             *         character; <code>false</code> otherwise.
138:             */
139:            public boolean contains(char c) {
140:                final int i = c >> 6;
141:                return i < _mapping.length ? (_mapping[i] & (1L << (c & 63))) != 0
142:                        : false;
143:            }
144:
145:            /**
146:             * Returns the character set containing the characters from this 
147:             * character set plus the characters from the character set specified.
148:             * 
149:             * @param that the set containing the characters to be added.
150:             * @return <code>this + that</code>
151:             */
152:            public CharSet plus(CharSet that) {
153:                if (that._mapping.length > this ._mapping.length)
154:                    return that.plus(this );
155:                CharSet result = this .copy();
156:                for (int i = that._mapping.length; --i >= 0;) {
157:                    result._mapping[i] |= that._mapping[i];
158:                }
159:                return result;
160:            }
161:
162:            /**
163:             * Returns the character set containing the characters from this 
164:             * character minus the characters from the character set specified.
165:             * 
166:             * @param that the set containing the character to be removed.
167:             * @return <code>this - that</code>
168:             */
169:            public CharSet minus(CharSet that) {
170:                CharSet result = this .copy();
171:                for (int i = MathLib.min(this ._mapping.length,
172:                        that._mapping.length); --i >= 0;) {
173:                    result._mapping[i] &= ~that._mapping[i];
174:                }
175:                return result;
176:            }
177:
178:            /**
179:             * Returns the textual representation of this character set.
180:             *  
181:             * @return the textual representation.
182:             */
183:            public String toString() {
184:                TextBuilder tb = TextBuilder.newInstance();
185:                tb.append('{');
186:                int length = _mapping.length << 6;
187:                for (int i = 0; i < length; i++) {
188:                    if (this .contains((char) i)) {
189:                        if (tb.length() > 1) {
190:                            tb.append(',');
191:                            tb.append(' ');
192:                        }
193:                        tb.append('\'');
194:                        tb.append((char) i);
195:                        tb.append('\'');
196:                    }
197:                }
198:                tb.append('}');
199:                return tb.toString();
200:            }
201:
202:            /**
203:             * Returns a copy of this character set.
204:             *  
205:             * @return an independant copy.
206:             */
207:            private CharSet copy() {
208:                CharSet charSet = new CharSet(new long[this ._mapping.length]);
209:                for (int i = _mapping.length; --i >= 0;) {
210:                    charSet._mapping[i] = _mapping[i];
211:                }
212:                return charSet;
213:            }
214:        }
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