Source Code Cross Referenced for PerlMode.java in  » IDE » J » org » armedbear » j » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » J » org.armedbear.j 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * PerlMode.java
003:         *
004:         * Copyright (C) 1998-2003 Peter Graves
005:         * $Id: PerlMode.java,v 1.2 2003/12/04 12:51:03 piso Exp $
006:         *
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License
009:         * as published by the Free Software Foundation; either version 2
010:         * of the License, or (at your option) any later version.
011:         *
012:         * This program is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:         * GNU General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU General Public License
018:         * along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
020:         */
021:
022:        package org.armedbear.j;
023:
024:        import gnu.regexp.RE;
025:        import gnu.regexp.UncheckedRE;
026:        import java.awt.event.KeyEvent;
027:
028:        public final class PerlMode extends AbstractMode implements  Constants,
029:                Mode {
030:            private static final PerlMode mode = new PerlMode();
031:
032:            private PerlMode() {
033:                super (PERL_MODE, PERL_MODE_NAME);
034:                keywords = new Keywords(this );
035:            }
036:
037:            public static final PerlMode getMode() {
038:                return mode;
039:            }
040:
041:            public final boolean canIndent() {
042:                return true;
043:            }
044:
045:            public final String getCommentStart() {
046:                return "# ";
047:            }
048:
049:            public final SyntaxIterator getSyntaxIterator(Position pos) {
050:                return new PerlSyntaxIterator(pos);
051:            }
052:
053:            public final Formatter getFormatter(Buffer buffer) {
054:                return new PerlFormatter(buffer);
055:            }
056:
057:            protected void setKeyMapDefaults(KeyMap km) {
058:                km.mapKey('{', "electricOpenBrace");
059:                km.mapKey('}', "electricCloseBrace");
060:                km.mapKey(';', "electricSemi");
061:                km.mapKey(KeyEvent.VK_TAB, 0, "tab");
062:                km.mapKey(KeyEvent.VK_ENTER, 0, "newlineAndIndent");
063:                km.mapKey(KeyEvent.VK_T, CTRL_MASK, "findTag");
064:                km.mapKey(KeyEvent.VK_PERIOD, ALT_MASK, "findTagAtDot");
065:                km.mapKey(KeyEvent.VK_L, CTRL_MASK | SHIFT_MASK, "listTags");
066:                km.mapKey(')', "closeParen");
067:                km.mapKey(KeyEvent.VK_I, ALT_MASK, "cycleIndentSize");
068:
069:                km.mapKey(KeyEvent.VK_OPEN_BRACKET, CTRL_MASK | SHIFT_MASK,
070:                        "insertBraces");
071:                // Duplicate mapping for 1.4.
072:                km.mapKey(KeyEvent.VK_BRACELEFT, CTRL_MASK | SHIFT_MASK,
073:                        "insertBraces");
074:
075:                km.mapKey(KeyEvent.VK_9, CTRL_MASK | SHIFT_MASK,
076:                        "insertParentheses");
077:
078:                km.mapKey(KeyEvent.VK_F12, 0, "wrapComment");
079:
080:                if (Platform.isPlatformLinux()) {
081:                    // Blackdown 1.1.7v3, 1.2pre2, IBM 1.1.8.
082:                    // Duplicate mappings needed for VK_9, VK_0 and VK_OPEN_BRACKET.
083:                    km.mapKey(0xbb, CTRL_MASK | SHIFT_MASK, "insertBraces");
084:
085:                    // Duplicate mapping to support IBM 1.3 for Linux.
086:                    km.mapKey(0xffc9, 0, "wrapComment"); // F12
087:                }
088:
089:                km.mapKey(KeyEvent.VK_OPEN_BRACKET, CTRL_MASK, "fold");
090:                km.mapKey(KeyEvent.VK_CLOSE_BRACKET, CTRL_MASK, "unfold");
091:            }
092:
093:            public Tagger getTagger(SystemBuffer buffer) {
094:                return new PerlTagger(buffer);
095:            }
096:
097:            public boolean isTaggable() {
098:                return true;
099:            }
100:
101:            public boolean hasQualifiedNames() {
102:                return true;
103:            }
104:
105:            public boolean isQualifiedName(String s) {
106:                return s.indexOf("::") >= 0;
107:            }
108:
109:            public int getCorrectIndentation(Line line, Buffer buffer) {
110:                String trim = line.trim();
111:                if (trim.length() > 0) {
112:                    Position pos = null;
113:                    char c = trim.charAt(0);
114:                    if (c == '}') {
115:                        pos = matchClosingBrace(new Position(line, line
116:                                .getText().indexOf('}')));
117:                        if (pos == null)
118:                            return 0;
119:                        if (!pos.getLine().trim().startsWith("{"))
120:                            pos = findBeginningOfStatement(pos);
121:                    } else if (c == ')') {
122:                        pos = findEnclosingParen(new Position(line, line
123:                                .getText().indexOf(')')));
124:                        if (pos == null)
125:                            return 0;
126:                        if (!pos.getLine().trim().startsWith("("))
127:                            pos = findBeginningOfStatement(pos);
128:                    }
129:                    if (pos != null)
130:                        return buffer.getIndentation(pos.getLine());
131:
132:                    // Labels are a special case.
133:                    if (isLabel(line))
134:                        return 0;
135:                }
136:                final Line modelLine = findModel(line);
137:                if (modelLine == null)
138:                    return 0;
139:                final int indentSize = buffer.getIndentSize();
140:                int modelIndent = 0;
141:                final String modelText = trimSyntacticWhitespace(modelLine
142:                        .getText());
143:                if (modelText.equals("{")) {
144:                    modelIndent = buffer.getIndentation(modelLine);
145:                    if (buffer.getBooleanProperty(Property.INDENT_AFTER_BRACE))
146:                        return modelIndent + indentSize;
147:                    else
148:                        return modelIndent;
149:                }
150:                Position pos = findBeginningOfStatement(new Position(modelLine,
151:                        0));
152:                if (pos != null)
153:                    modelIndent = buffer.getIndentation(pos.getLine());
154:                if (modelText.endsWith("{")) {
155:                    if (buffer.getBooleanProperty(Property.INDENT_AFTER_BRACE))
156:                        return modelIndent + indentSize;
157:                    else
158:                        return modelIndent;
159:                }
160:                if (modelText.endsWith("}"))
161:                    return modelIndent;
162:                if (modelText.endsWith(";"))
163:                    return modelIndent;
164:                pos = findEnclosingParen(new Position(line, 0));
165:                if (pos != null) {
166:                    if (pos.getLine().trim().endsWith("(")
167:                            || !buffer
168:                                    .getBooleanProperty(Property.LINEUP_ARGLIST)) {
169:                        return buffer.getIndentation(pos.getLine())
170:                                + indentSize;
171:                    } else {
172:                        // Advance past '('.
173:                        pos.skip(1);
174:                        // Advance to first non-whitespace char.
175:                        pos.skipWhitespaceOnCurrentLine();
176:                        return buffer.getCol(pos);
177:                    }
178:                }
179:                if (modelText.endsWith(","))
180:                    return buffer.getIndentation(modelLine);
181:
182:                // Continuation line.
183:                pos = findBeginningOfStatement(new Position(line, 0));
184:
185:                if (pos != null) {
186:                    if (line.getText().trim().startsWith("{")) {
187:                        if (buffer
188:                                .getBooleanProperty(Property.INDENT_BEFORE_BRACE))
189:                            return buffer.getIndentation(pos.getLine())
190:                                    + indentSize;
191:                        else
192:                            return buffer.getIndentation(pos.getLine());
193:                    } else
194:                        return buffer.getIndentation(pos.getLine())
195:                                + indentSize;
196:                }
197:                return modelIndent;
198:            }
199:
200:            private static Line findModel(Line line) {
201:                for (Line modelLine = line.previous(); modelLine != null; modelLine = modelLine
202:                        .previous()) {
203:                    if (modelLine.isBlank())
204:                        continue;
205:                    else if (modelLine.trim().startsWith("#"))
206:                        continue;
207:                    else if (isLabel(modelLine))
208:                        continue;
209:                    else
210:                        return modelLine;
211:                }
212:                return null;
213:            }
214:
215:            private static RE labelRE = new UncheckedRE(
216:                    "^\\s*[A-Za-z0-9_]+:\\s*$");
217:
218:            private static boolean isLabel(Line line) {
219:                return labelRE.getMatch(line.getText()) != null;
220:            }
221:
222:            // Scan backwards from starting position, looking for unmatched opening
223:            // parenthesis.
224:            private static Position findEnclosingParen(Position start) {
225:                PerlSyntaxIterator it = new PerlSyntaxIterator(start);
226:                int count = 0;
227:                char c;
228:                while ((c = it.prevChar()) != SyntaxIterator.DONE) {
229:                    if (c == '}')
230:                        return null;
231:                    if (c == ')') {
232:                        ++count;
233:                    } else if (c == '(') {
234:                        if (count == 0)
235:                            return it.getPosition(); // Found unmatched '('.
236:                        else
237:                            --count;
238:                    }
239:                }
240:                return null;
241:            }
242:
243:            static Position findBeginningOfStatement(Position start) {
244:                Position pos = new Position(start);
245:                if (pos.getLine().trim().startsWith("}")) {
246:                    Position posMatch = matchClosingBrace(new Position(pos
247:                            .getLine(), 0));
248:                    if (posMatch != null)
249:                        pos = posMatch;
250:                } else {
251:                    Position posParen = findEnclosingParen(pos);
252:                    if (posParen != null)
253:                        pos = posParen;
254:                }
255:                while (pos.getLine() != null) {
256:                    pos.setLine(pos.getLine().previous());
257:                    if (pos.getLine() == null)
258:                        break;
259:                    pos.setOffset(pos.getLineLength());
260:                    String s = trimSyntacticWhitespace(pos.getLine().getText());
261:                    if (s.length() > 0) {
262:                        char c = s.charAt(s.length() - 1);
263:                        if (c == ';' || c == '{' || c == '}' || c == ':')
264:                            break;
265:                    }
266:                }
267:                if (pos.getLine() == null) {
268:                    pos.moveTo(start.getLine(), 0);
269:                } else {
270:                    // Skip syntactic whitespace.
271:                    PerlSyntaxIterator it = new PerlSyntaxIterator(pos);
272:                    while (true) {
273:                        char c = it.nextChar();
274:                        if (c == SyntaxIterator.DONE)
275:                            break;
276:                        if (c > ' ')
277:                            break;
278:                    }
279:                    pos = it.getPosition();
280:                }
281:                return pos;
282:            }
283:
284:            private static Position matchClosingBrace(Position start) {
285:                int count = 1;
286:                PerlSyntaxIterator it = new PerlSyntaxIterator(start);
287:                char c;
288:                while ((c = it.prevChar()) != SyntaxIterator.DONE) {
289:                    if (c == '}')
290:                        ++count;
291:                    else if (c == '{')
292:                        --count;
293:                    if (count == 0) // Found it!
294:                        return it.getPosition();
295:                }
296:                return null;
297:            }
298:
299:            // Replace syntactic whitespace (quotes and comments) with actual space
300:            // characters and return trimmed string.
301:            protected static String trimSyntacticWhitespace(String s) {
302:                PerlSyntaxIterator it = new PerlSyntaxIterator(null);
303:                return (new String(it.hideSyntacticWhitespace(s))).trim();
304:            }
305:
306:            private static final String validChars = "$@%ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_0123456789";
307:
308:            static final boolean isIdentifierChar(char c) {
309:                return (validChars.indexOf(c) >= 0);
310:            }
311:
312:            public boolean isIdentifierStart(char c) {
313:                return isIdentifierChar(c);
314:            }
315:
316:            public boolean isIdentifierPart(char c) {
317:                return isIdentifierChar(c);
318:            }
319:
320:            public boolean isCommentLine(Line line) {
321:                return line.trim().startsWith("#");
322:            }
323:        }
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