Source Code Cross Referenced for BNF.java in  » Internationalization-Localization » icu4j » com » ibm » icu » dev » test » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Internationalization Localization » icu4j » com.ibm.icu.dev.test.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        //##header
002:        /*
003:         *******************************************************************************
004:         * Copyright (C) 2002-2006, International Business Machines Corporation and    *
005:         * others. All Rights Reserved.                                                *
006:         *******************************************************************************
007:         */
008:        //#ifndef FOUNDATION
009:        package com.ibm.icu.dev.test.util;
010:
011:        import java.util.ArrayList;
012:        import java.util.Map;
013:        import java.util.Set;
014:        import java.util.HashMap;
015:        import java.util.HashSet;
016:        import java.util.Iterator;
017:
018:        import com.ibm.icu.text.UnicodeSet;
019:        import java.util.Random;
020:
021:        public class BNF {
022:            private Map map = new HashMap();
023:            private Set variables = new HashSet();
024:            private Pick pick = null;
025:            private Pick.Target target = null;
026:            private Tokenizer t;
027:            private Quoter quoter;
028:            private Random random;
029:
030:            public String next() {
031:                return target.next();
032:            }
033:
034:            public String getInternal() {
035:                return pick.getInternal(0, new HashSet());
036:            }
037:
038:            /*
039:            + "weight = integer '%';"
040:            + "range = '{' integer (',' integer?)? '}' weight*;"
041:            + "quote = '@';"
042:            + "star = '*' weight*;"
043:            + "plus = '+' weight*;"
044:            + "maybe = '?' weight?;"
045:            + "quantifier = range | star | maybe | plus;"
046:            + "core = string | unicodeSet | '(' alternation ')';"
047:            + "sequence = (core quantifier*)+;"
048:            + "alternation = sequence (weight? ('|' sequence weight?)+)?;"
049:            + "rule = string '=' alternation;"; 
050:            
051:            
052:             *      Match 0 or more times
053:            +      Match 1 or more times
054:            ?      Match 1 or 0 times
055:            {n}    Match exactly n times
056:            {n,}   Match at least n times
057:            {n,m}  Match at least n but not more than m times  
058:            
059:            
060:
061:             */
062:
063:            public BNF(Random random, Quoter quoter) {
064:                this .random = random;
065:                this .quoter = quoter;
066:                t = new Tokenizer();
067:            }
068:
069:            public BNF addRules(String rules) {
070:                t.setSource(rules);
071:                while (addRule()) {
072:                }
073:                return this ; // for chaining
074:            }
075:
076:            public BNF complete() {
077:                // check that the rules match the variables, except for $root in rules
078:                Set ruleSet = map.keySet();
079:                // add also 
080:                variables.add("$root");
081:                variables.addAll(t.getLookedUpItems());
082:                if (!ruleSet.equals(variables)) {
083:                    String msg = showDiff(variables, ruleSet);
084:                    if (msg.length() != 0)
085:                        msg = "Error: Missing definitions for: " + msg;
086:                    String temp = showDiff(ruleSet, variables);
087:                    if (temp.length() != 0)
088:                        temp = "Warning: Defined but not used: " + temp;
089:                    if (msg.length() == 0)
090:                        msg = temp;
091:                    else if (temp.length() != 0) {
092:                        msg = msg + "; " + temp;
093:                    }
094:                    error(msg);
095:                }
096:
097:                if (!ruleSet.equals(variables)) {
098:                    String msg = showDiff(variables, ruleSet);
099:                    if (msg.length() != 0)
100:                        msg = "Missing definitions for: " + msg;
101:                    String temp = showDiff(ruleSet, variables);
102:                    if (temp.length() != 0)
103:                        temp = "Defined but not used: " + temp;
104:                    if (msg.length() == 0)
105:                        msg = temp;
106:                    else if (temp.length() != 0) {
107:                        msg = msg + "; " + temp;
108:                    }
109:                    error(msg);
110:                }
111:
112:                // replace variables by definitions
113:                Iterator it = ruleSet.iterator();
114:                while (it.hasNext()) {
115:                    String key = (String) it.next();
116:                    Pick expression = (Pick) map.get(key);
117:                    Iterator it2 = ruleSet.iterator();
118:                    if (false && key.equals("$crlf")) {
119:                        System.out.println("debug");
120:                    }
121:                    while (it2.hasNext()) {
122:                        Object key2 = it2.next();
123:                        if (key.equals(key2))
124:                            continue;
125:                        Pick expression2 = (Pick) map.get(key2);
126:                        expression2.replace(key, expression);
127:                    }
128:                }
129:                pick = (Pick) map.get("$root");
130:                target = Pick.Target.make(pick, random, quoter);
131:                // TODO remove temp collections
132:                return this ;
133:            }
134:
135:            String showDiff(Set a, Set b) {
136:                Set temp = new HashSet();
137:                temp.addAll(a);
138:                temp.removeAll(b);
139:                if (temp.size() == 0)
140:                    return "";
141:                StringBuffer buffer = new StringBuffer();
142:                Iterator it = temp.iterator();
143:                while (it.hasNext()) {
144:                    if (buffer.length() != 0)
145:                        buffer.append(", ");
146:                    buffer.append(it.next().toString());
147:                }
148:                return buffer.toString();
149:            }
150:
151:            void error(String msg) {
152:                throw new IllegalArgumentException(msg + "\r\n" + t.toString());
153:            }
154:
155:            private boolean addRule() {
156:                int type = t.next();
157:                if (type == Tokenizer.DONE)
158:                    return false;
159:                if (type != Tokenizer.STRING)
160:                    error("missing weight");
161:                String s = t.getString();
162:                if (s.length() == 0 || s.charAt(0) != '$')
163:                    error("missing $ in variable");
164:                if (t.next() != '=')
165:                    error("missing =");
166:                int startBody = t.index;
167:                Pick rule = getAlternation();
168:                if (rule == null)
169:                    error("missing expression");
170:                t.addSymbol(s, t.getSource(), startBody, t.index);
171:                if (t.next() != ';')
172:                    error("missing ;");
173:                return addPick(s, rule);
174:            }
175:
176:            protected boolean addPick(String s, Pick rule) {
177:                Object temp = map.get(s);
178:                if (temp != null)
179:                    error("duplicate variable");
180:                if (rule.name == null)
181:                    rule.name(s);
182:                map.put(s, rule);
183:                return true;
184:            }
185:
186:            public BNF addSet(String variable, UnicodeSet set) {
187:                if (set != null) {
188:                    String body = set.toString();
189:                    t.addSymbol(variable, body, 0, body.length());
190:                    addPick(variable, Pick.codePoint(set));
191:                }
192:                return this ;
193:            }
194:
195:            int maxRepeat = 99;
196:
197:            Pick qualify(Pick item) {
198:                int[] weights;
199:                int type = t.next();
200:                switch (type) {
201:                case '@':
202:                    return new Pick.Quote(item);
203:                case '~':
204:                    return new Pick.Morph(item);
205:                case '?':
206:                    int weight = getWeight();
207:                    if (weight == NO_WEIGHT)
208:                        weight = 50;
209:                    weights = new int[] { 100 - weight, weight };
210:                    return Pick.repeat(0, 1, weights, item);
211:                case '*':
212:                    weights = getWeights();
213:                    return Pick.repeat(1, maxRepeat, weights, item);
214:                case '+':
215:                    weights = getWeights();
216:                    return Pick.repeat(1, maxRepeat, weights, item);
217:                case '{':
218:                    if (t.next() != Tokenizer.NUMBER)
219:                        error("missing number");
220:                    int start = (int) t.getNumber();
221:                    int end = start;
222:                    type = t.next();
223:                    if (type == ',') {
224:                        end = maxRepeat;
225:                        type = t.next();
226:                        if (type == Tokenizer.NUMBER) {
227:                            end = (int) t.getNumber();
228:                            type = t.next();
229:                        }
230:                    }
231:                    if (type != '}')
232:                        error("missing }");
233:                    weights = getWeights();
234:                    return Pick.repeat(start, end, weights, item);
235:                }
236:                t.backup();
237:                return item;
238:            }
239:
240:            Pick getCore() {
241:                int token = t.next();
242:                if (token == Tokenizer.STRING) {
243:                    String s = t.getString();
244:                    if (s.charAt(0) == '$')
245:                        variables.add(s);
246:                    return Pick.string(s);
247:                }
248:                if (token == Tokenizer.UNICODESET) {
249:                    return Pick.codePoint(t.getUnicodeSet());
250:                }
251:                if (token != '(') {
252:                    t.backup();
253:                    return null;
254:                }
255:                Pick temp = getAlternation();
256:                token = t.next();
257:                if (token != ')')
258:                    error("missing )");
259:                return temp;
260:            }
261:
262:            Pick getSequence() {
263:                Pick.Sequence result = null;
264:                Pick last = null;
265:                while (true) {
266:                    Pick item = getCore();
267:                    if (item == null) {
268:                        if (result != null)
269:                            return result;
270:                        if (last != null)
271:                            return last;
272:                        error("missing item");
273:                    }
274:                    // qualify it as many times as possible
275:                    Pick oldItem;
276:                    do {
277:                        oldItem = item;
278:                        item = qualify(item);
279:                    } while (item != oldItem);
280:                    // add it in
281:                    if (last == null) {
282:                        last = item;
283:                    } else {
284:                        if (result == null)
285:                            result = Pick.makeSequence().and2(last);
286:                        result = result.and2(item);
287:                    }
288:                }
289:            }
290:
291:            // for simplicity, we just use recursive descent
292:            Pick getAlternation() {
293:                Pick.Alternation result = null;
294:                Pick last = null;
295:                int lastWeight = NO_WEIGHT;
296:                while (true) {
297:                    Pick temp = getSequence();
298:                    if (temp == null)
299:                        error("empty alternation");
300:                    int weight = getWeight();
301:                    if (weight == NO_WEIGHT)
302:                        weight = 1;
303:                    if (last == null) {
304:                        last = temp;
305:                        lastWeight = weight;
306:                    } else {
307:                        if (result == null)
308:                            result = Pick.makeAlternation().or2(lastWeight,
309:                                    last);
310:                        result = result.or2(weight, temp);
311:                    }
312:                    int token = t.next();
313:                    if (token != '|') {
314:                        t.backup();
315:                        if (result != null)
316:                            return result;
317:                        if (last != null)
318:                            return last;
319:                    }
320:                }
321:            }
322:
323:            private static final int NO_WEIGHT = Integer.MIN_VALUE;
324:
325:            int getWeight() {
326:                int weight;
327:                int token = t.next();
328:                if (token != Tokenizer.NUMBER) {
329:                    t.backup();
330:                    return NO_WEIGHT;
331:                }
332:                weight = (int) t.getNumber();
333:                token = t.next();
334:                if (token != '%')
335:                    error("missing %");
336:                return weight;
337:            }
338:
339:            int[] getWeights() {
340:                ArrayList list = new ArrayList();
341:                while (true) {
342:                    int weight = getWeight();
343:                    if (weight == NO_WEIGHT)
344:                        break;
345:                    list.add(new Integer(weight));
346:                }
347:                if (list.size() == 0)
348:                    return null;
349:                int[] result = new int[list.size()];
350:                for (int i = 0; i < list.size(); ++i) {
351:                    result[i] = ((Integer) list.get(i)).intValue();
352:                }
353:                return result;
354:            }
355:        }
356:        //#endif
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