Source Code Cross Referenced for REApplet.java in  » Database-DBMS » mckoi » gnu » regexp » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » mckoi » gnu.regexp.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  gnu/regexp/util/REApplet.java
003:         *  Copyright (C) 1998 Wes Biggs
004:         *
005:         *  This program is free software; you can redistribute it and/or modify
006:         *  it under the terms of the GNU General Public License as published
007:         *  by the Free Software Foundation; either version 2 of the License, or
008:         *  (at your option) any later version.
009:         *
010:         *  This program is distributed in the hope that it will be useful,
011:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013:         *  GNU General Public License for more details.
014:         *
015:         *  You should have received a copy of the GNU General Public License
016:         *  along with this program; if not, write to the Free Software
017:         *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
018:         */
019:
020:        package gnu.regexp.util;
021:
022:        import java.applet.*;
023:        import java.awt.*;
024:        import gnu.regexp.*;
025:
026:        /**
027:         * This is a simple applet to demonstrate the capabilities of gnu.regexp.
028:         * To run it, use appletviewer on the reapplet.html file included in the
029:         * documentation directory.
030:         *
031:         * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
032:         * @version 1.02
033:         */
034:        public class REApplet extends Applet {
035:            private Label l1, l2, l3, l4;
036:            private Button b;
037:            private TextField tf;
038:            private TextArea input, output;
039:            private Checkbox insens;
040:            private Choice syntax;
041:            private static String[] names = new String[] { "awk", "ed",
042:                    "egrep", "emacs", "grep", "POSIX awk", "POSIX basic",
043:                    "POSIX egrep", "POSIX extended", "POSIX minimal basic",
044:                    "POSIX minimal extended", "sed", "perl 4",
045:                    "perl 4 (singe line)", "perl 5", "perl 5 (single line)" };
046:
047:            private static RESyntax[] values = new RESyntax[] {
048:                    new RESyntax(RESyntax.RE_SYNTAX_AWK).setLineSeparator("\n"),
049:                    new RESyntax(RESyntax.RE_SYNTAX_ED).setLineSeparator("\n"),
050:                    new RESyntax(RESyntax.RE_SYNTAX_EGREP)
051:                            .setLineSeparator("\n"),
052:                    new RESyntax(RESyntax.RE_SYNTAX_EMACS)
053:                            .setLineSeparator("\n"),
054:                    new RESyntax(RESyntax.RE_SYNTAX_GREP)
055:                            .setLineSeparator("\n"),
056:                    new RESyntax(RESyntax.RE_SYNTAX_POSIX_AWK)
057:                            .setLineSeparator("\n"),
058:                    new RESyntax(RESyntax.RE_SYNTAX_POSIX_BASIC)
059:                            .setLineSeparator("\n"),
060:                    new RESyntax(RESyntax.RE_SYNTAX_POSIX_EGREP)
061:                            .setLineSeparator("\n"),
062:                    new RESyntax(RESyntax.RE_SYNTAX_POSIX_EXTENDED)
063:                            .setLineSeparator("\n"),
064:                    new RESyntax(RESyntax.RE_SYNTAX_POSIX_MINIMAL_BASIC)
065:                            .setLineSeparator("\n"),
066:                    new RESyntax(RESyntax.RE_SYNTAX_POSIX_MINIMAL_EXTENDED)
067:                            .setLineSeparator("\n"),
068:                    new RESyntax(RESyntax.RE_SYNTAX_SED).setLineSeparator("\n"),
069:                    new RESyntax(RESyntax.RE_SYNTAX_PERL4)
070:                            .setLineSeparator("\n"),
071:                    new RESyntax(RESyntax.RE_SYNTAX_PERL4_S)
072:                            .setLineSeparator("\n"),
073:                    new RESyntax(RESyntax.RE_SYNTAX_PERL5)
074:                            .setLineSeparator("\n"),
075:                    new RESyntax(RESyntax.RE_SYNTAX_PERL5_S)
076:                            .setLineSeparator("\n") };
077:
078:            /** Creates an REApplet. */
079:            public REApplet() {
080:                super ();
081:            }
082:
083:            /** Initializes the applet and constructs GUI elements. */
084:            public void init() {
085:                // test run RE stuff to cache gnu.regexp.* classes.
086:                try {
087:                    RE x = new RE("^.*(w[x])\1$");
088:                    REMatchEnumeration xx = x.getMatchEnumeration("wxwx");
089:                    while (xx.hasMoreMatches())
090:                        xx.nextMatch().toString();
091:                } catch (REException arg) {
092:                }
093:
094:                setBackground(Color.lightGray);
095:
096:                /*
097:                  Layout looks like this:
098:                  
099:                  [0,0:[0,0: Regular Expression] [1,0: Textbox]
100:                  [0,1: Expression Syntax]  [1,1: [0,0: Choice] [1,0: Checkbox]]
101:                  [1,2: Button]]
102:                  [0,1: Input Text] [1,1: Match]
103:                  [0,2: Textarea]   [1,2: Textarea]
104:                 */
105:
106:                GridBagLayout gbag = new GridBagLayout();
107:                setLayout(gbag);
108:                GridBagConstraints c = new GridBagConstraints();
109:                Panel p = new Panel();
110:                GridBagLayout gbag2 = new GridBagLayout();
111:                p.setLayout(gbag2);
112:
113:                c.anchor = GridBagConstraints.WEST;
114:                c.weightx = 1.0;
115:
116:                // [0,0: Regular Expression]
117:                c.gridx = 0;
118:                c.gridy = 0;
119:                l1 = new Label("Regular Expression");
120:                gbag2.setConstraints(l1, c);
121:                p.add(l1);
122:
123:                // [1,0: TextField]
124:                c.gridx = 1;
125:                tf = new TextField(getParameter("regexp"), 30);
126:                gbag2.setConstraints(tf, c);
127:                p.add(tf);
128:
129:                // [0,1: Expression Syntax]
130:                c.gridx = 0;
131:                c.gridy = 1;
132:                l4 = new Label("Expression Syntax");
133:                gbag2.setConstraints(l4, c);
134:                p.add(l4);
135:
136:                // [1,1: subpanel]
137:                Panel p2 = new Panel();
138:                GridBagLayout gbag3 = new GridBagLayout();
139:                p2.setLayout(gbag3);
140:                c.gridx = 1;
141:                gbag2.setConstraints(p2, c);
142:                p.add(p2);
143:
144:                // Subpanel [0,0: Choice]
145:                c.gridx = 0;
146:                c.gridy = 0;
147:                syntax = new Choice();
148:                for (int i = 0; i < names.length; i++)
149:                    syntax.addItem(names[i]);
150:                String zz = getParameter("syntax");
151:                if (zz != null) {
152:                    try {
153:                        syntax.select(getParameter("syntax"));
154:                    } catch (IllegalArgumentException e) {
155:                    }
156:                }
157:
158:                gbag3.setConstraints(syntax, c);
159:                p2.add(syntax);
160:
161:                c.gridx = 1;
162:                insens = new Checkbox("Ignore case", false);
163:                gbag3.setConstraints(insens, c);
164:                p2.add(insens);
165:
166:                // Next Row
167:                c.gridx = 1;
168:                c.gridy = 2;
169:                b = new Button("Match");
170:                gbag2.setConstraints(b, c);
171:                p.add(b);
172:
173:                // Add the entire upper panel.
174:                c.gridwidth = 2;
175:                c.gridheight = 1;
176:                c.gridx = 0;
177:                c.gridy = 0;
178:                c.anchor = GridBagConstraints.CENTER;
179:                gbag.setConstraints(p, c);
180:                add(p);
181:
182:                c.gridwidth = 1;
183:                c.gridheight = 1;
184:
185:                // Main: [0,1]:
186:                l2 = new Label("Input Text");
187:                c.gridwidth = 1;
188:                c.gridx = 0;
189:                c.gridy = 1;
190:                gbag.setConstraints(l2, c);
191:                add(l2);
192:
193:                l3 = new Label("Matches Found");
194:                c.gridx = 1;
195:                gbag.setConstraints(l3, c);
196:                add(l3);
197:
198:                input = new TextArea(getParameter("input"), 5, 30);
199:                c.gridx = 0;
200:                c.gridy = 2;
201:                gbag.setConstraints(input, c);
202:                add(input);
203:
204:                c.gridx = 1;
205:                output = new TextArea(5, 30);
206:                output.setEditable(false);
207:                c.gridwidth = GridBagConstraints.REMAINDER;
208:                gbag.setConstraints(output, c);
209:                add(output);
210:            }
211:
212:            /**
213:             * Handles events in the applet.  Returns true if the indicated event
214:             * was handled, false for all other events.
215:             */
216:            public boolean action(Event e, Object arg) {
217:                Object target = e.target;
218:
219:                if (target == b) { // match
220:                    try {
221:                        String expr = tf.getText();
222:                        RE reg = null;
223:                        RESyntax res = values[syntax.getSelectedIndex()];
224:                        reg = new RE(expr, insens.getState() ? RE.REG_ICASE
225:                                | RE.REG_MULTILINE : RE.REG_MULTILINE, res);
226:                        REMatchEnumeration en = reg.getMatchEnumeration(input
227:                                .getText());
228:                        StringBuffer sb = new StringBuffer();
229:                        int matchNum = 0;
230:                        while (en.hasMoreMatches()) {
231:                            sb.append(String.valueOf(++matchNum));
232:                            sb.append(". ");
233:                            sb.append(en.nextMatch().toString());
234:                            sb.append('\n');
235:                        }
236:                        output.setText(sb.toString());
237:                    } catch (REException err) {
238:                        output.setText("Expression compilation error: "
239:                                + err.getMessage());
240:                    }
241:                    return true;
242:                } else
243:                    return false;
244:            }
245:        }
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