Source Code Cross Referenced for MultiSyntax.java in  » Swing-Library » abeille-forms-designer » org » netbeans » editor » ext » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » abeille forms designer » org.netbeans.editor.ext 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *                 Sun Public License Notice
003:         * 
004:         * The contents of this file are subject to the Sun Public License
005:         * Version 1.0 (the "License"). You may not use this file except in
006:         * compliance with the License. A copy of the License is available at
007:         * http://www.sun.com/
008:         * 
009:         * The Original Code is NetBeans. The Initial Developer of the Original
010:         * Code is Sun Microsystems, Inc. Portions Copyright 1997-2000 Sun
011:         * Microsystems, Inc. All Rights Reserved.
012:         */
013:
014:        package org.netbeans.editor.ext;
015:
016:        import org.netbeans.editor.Syntax;
017:
018:        /**
019:         * Composition of several syntaxes together. There are several different
020:         * situations in which this class can be used efficiently: 1) Syntax that wants
021:         * to use some other syntax internally for recognizing one or more tokens.
022:         * Example is java analyzer that would like to use html-syntax for detail
023:         * parsing block comments.
024:         * 
025:         * 2) Master syntax that will manage two or more slave syntaxes. Example is the
026:         * master syntax managing java-syntax and html-syntax. The result would be the
027:         * same like in the previous example but it's more independent.
028:         * 
029:         * 3) Master syntax that handles switching of the two or more other syntaxes.
030:         * Only one slave syntax is active at one time.
031:         * 
032:         * 4) An aribitrary combination and nesting of the previous examples.
033:         * 
034:         * @author Miloslav Metelka
035:         * @version 1.00
036:         */
037:
038:        public class MultiSyntax extends Syntax {
039:
040:            /**
041:             * Slave syntaxes that can be used for scanning. They can be added by
042:             * registerSyntax().
043:             */
044:            private SyntaxInfo slaveSyntaxChain;
045:
046:            /** Last chain member of the slaveSyntaxChain */
047:            private SyntaxInfo slaveSyntaxChainEnd;
048:
049:            /** Register a particular slave syntax. */
050:            protected void registerSyntax(Syntax slaveSyntax) {
051:                slaveSyntaxChainEnd = new SyntaxInfo(slaveSyntax,
052:                        slaveSyntaxChainEnd);
053:                if (slaveSyntaxChain == null) {
054:                    slaveSyntaxChain = slaveSyntaxChainEnd;
055:                }
056:            }
057:
058:            /** Store state of this analyzer into given mark state. */
059:            public void storeState(StateInfo stateInfo) {
060:                super .storeState(stateInfo);
061:                ((MultiStateInfo) stateInfo).store(this );
062:            }
063:
064:            public void loadInitState() {
065:                super .loadInitState();
066:                SyntaxInfo syntaxItem = slaveSyntaxChain;
067:                while (syntaxItem != null) {
068:                    syntaxItem.syntax.loadInitState();
069:                    syntaxItem = syntaxItem.next;
070:                }
071:            }
072:
073:            public void load(StateInfo stateInfo, char buffer[], int offset,
074:                    int len, boolean lastBuffer, int stopPosition) {
075:                ((MultiStateInfo) stateInfo).load(this , buffer, offset, len,
076:                        lastBuffer, stopPosition);
077:                super .load(stateInfo, buffer, offset, len, lastBuffer,
078:                        stopPosition);
079:            }
080:
081:            public StateInfo createStateInfo() {
082:                return new MultiStateInfo();
083:            }
084:
085:            /**
086:             * Compare state of this analyzer to given state info. The basic
087:             * implementation does the following: 1. state info of the main syntax is
088:             * compared 2. if the result is EQUAL_STATE then go through all the
089:             * registered slave syntaxes: a) get the info
090:             */
091:            public int compareState(StateInfo stateInfo) {
092:                int diff = super .compareState(stateInfo);
093:                if (diff == EQUAL_STATE) {
094:                    diff = ((MultiStateInfo) stateInfo).compare(this );
095:                }
096:                return diff;
097:            }
098:
099:            /**
100:             * Class that can contain any number of the additional state infos from
101:             * other syntaxes. The state infos stored are identified by the their syntax
102:             * classes.
103:             */
104:            public static class MultiStateInfo extends BaseStateInfo {
105:
106:                private ChainItem stateInfoChain;
107:
108:                /**
109:                 * Goes through all the syntaxes and inits them. If the multi-state-info
110:                 * has valid state-info for the given syntax the state-info is used.
111:                 * Otherwise the syntax is inited to the init state.
112:                 */
113:                void load(MultiSyntax masterSyntax, char[] buffer, int offset,
114:                        int len, boolean lastBuffer, int stopPosition) {
115:                    SyntaxInfo syntaxItem = masterSyntax.slaveSyntaxChain;
116:                    while (syntaxItem != null) {
117:                        StateInfo loadInfo = null;
118:                        int masterOffsetDelta = 0;
119:                        Syntax s = syntaxItem.syntax;
120:                        if (syntaxItem.active) {
121:                            Class sc = s.getClass();
122:                            ChainItem item = stateInfoChain;
123:                            while (item != null) {
124:                                if (item.syntaxClass == sc && item.valid) {
125:                                    loadInfo = item.stateInfo;
126:                                    masterOffsetDelta = item.masterOffsetDelta;
127:                                    break;
128:                                }
129:                                item = item.prev;
130:                            }
131:                        }
132:                        s.load(loadInfo, buffer, offset + masterOffsetDelta,
133:                                len - masterOffsetDelta, lastBuffer,
134:                                stopPosition);
135:                        syntaxItem = syntaxItem.next;
136:                    }
137:                }
138:
139:                void store(MultiSyntax masterSyntax) {
140:                    // Invalidate all state-info chain items
141:                    ChainItem item = stateInfoChain;
142:                    while (item != null) {
143:                        item.valid = false;
144:                        item = item.prev;
145:                    }
146:
147:                    // Go through active syntaxes and store their info and master-offset
148:                    SyntaxInfo syntaxItem = masterSyntax.slaveSyntaxChain;
149:                    while (syntaxItem != null) {
150:                        if (syntaxItem.active) {
151:                            Syntax s = syntaxItem.syntax;
152:                            Class sc = s.getClass();
153:                            item = stateInfoChain;
154:                            while (item != null) {
155:                                if (item.syntaxClass == sc) { // found right item
156:                                    break;
157:                                }
158:                                item = item.prev;
159:                            }
160:                            if (item == null) { // not found, add new
161:                                item = stateInfoChain = new ChainItem(s
162:                                        .createStateInfo(), sc, stateInfoChain);
163:                            }
164:                            // Store the state and compute masterOffsetDelta
165:                            s.storeState(item.stateInfo);
166:                            item.masterOffsetDelta = s.getOffset()
167:                                    - masterSyntax.getOffset();
168:                            item.valid = true;
169:                        }
170:                        syntaxItem = syntaxItem.next;
171:                    }
172:                }
173:
174:                int compare(MultiSyntax masterSyntax) {
175:                    int ret = Syntax.EQUAL_STATE;
176:                    // Go through valid state-info chain items
177:                    ChainItem item = stateInfoChain;
178:                    while (item != null && ret == Syntax.EQUAL_STATE) {
179:                        if (item.valid) {
180:                            Class sc = item.syntaxClass;
181:                            SyntaxInfo syntaxItem = masterSyntax.slaveSyntaxChain;
182:                            while (syntaxItem != null) {
183:                                if (syntaxItem.syntax.getClass() == sc) {
184:                                    if (syntaxItem.active) {
185:                                        ret = syntaxItem.syntax
186:                                                .compareState(item.stateInfo);
187:                                    } else { // syntax not active but should be
188:                                        ret = Syntax.DIFFERENT_STATE;
189:                                    }
190:                                    break;
191:                                }
192:                                syntaxItem = syntaxItem.next;
193:                            }
194:                        }
195:                        item = item.prev;
196:                    }
197:                    return ret;
198:                }
199:
200:                static class ChainItem {
201:
202:                    /**
203:                     * Whether this item is valid. It can become invalid if the syntax
204:                     * that it represents becomes inactive in this item.
205:                     */
206:                    boolean valid;
207:
208:                    /** State info of the particular slave syntax */
209:                    StateInfo stateInfo;
210:
211:                    /*
212:                     * Delta of the offset variable of the slave syntax against the
213:                     * offset variable of the master syntax.
214:                     */
215:                    int masterOffsetDelta;
216:
217:                    /** Class of the syntax this info is for */
218:                    Class syntaxClass;
219:
220:                    /** Previous chain item in the list */
221:                    ChainItem prev;
222:
223:                    ChainItem(StateInfo stateInfo, Class syntaxClass,
224:                            ChainItem prev) {
225:                        this .stateInfo = stateInfo;
226:                        this .syntaxClass = syntaxClass;
227:                        this .prev = prev;
228:                    }
229:
230:                }
231:
232:            }
233:
234:            /** Extended info about one slave syntax */
235:            static class SyntaxInfo {
236:
237:                SyntaxInfo(Syntax syntax, SyntaxInfo prevChainEnd) {
238:                    this .syntax = syntax;
239:
240:                    if (prevChainEnd != null) {
241:                        prev = prevChainEnd;
242:                        prevChainEnd.next = this ;
243:                    }
244:                }
245:
246:                /** The slave syntax itself */
247:                Syntax syntax;
248:
249:                /**
250:                 * Whether this syntax is actively scanning the text. There can be
251:                 * possibly more syntaxes scanning the in a nested way.
252:                 */
253:                boolean active;
254:
255:                /** Next member in the chain */
256:                SyntaxInfo next;
257:
258:                /** Previous member in the chain */
259:                SyntaxInfo prev;
260:
261:            }
262:
263:        }
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