Source Code Cross Referenced for AnalyzeString.java in  » XML » saxonb » net » sf » saxon » instruct » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.instruct 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.instruct;
002:
003:        import net.sf.saxon.expr.*;
004:        import net.sf.saxon.functions.Matches;
005:        import net.sf.saxon.om.Item;
006:        import net.sf.saxon.om.NamePool;
007:        import net.sf.saxon.pattern.NoNodeTest;
008:        import net.sf.saxon.style.StandardNames;
009:        import net.sf.saxon.trans.DynamicError;
010:        import net.sf.saxon.trans.XPathException;
011:        import net.sf.saxon.type.*;
012:        import net.sf.saxon.value.SequenceType;
013:
014:        import java.io.PrintStream;
015:        import java.util.ArrayList;
016:        import java.util.Iterator;
017:        import java.util.regex.Pattern;
018:        import java.util.regex.PatternSyntaxException;
019:
020:        /**
021:         * An xsl:analyze-string elements in the stylesheet. New at XSLT 2.0<BR>
022:         */
023:
024:        public class AnalyzeString extends Instruction {
025:
026:            private Expression select;
027:            private Expression regex;
028:            private Expression flags;
029:            private Expression matching;
030:            private Expression nonMatching;
031:            private Pattern pattern; // a regex pattern, not an XSLT pattern!
032:
033:            /**
034:             * Construct an AnalyzeString instruction
035:             *
036:             * @param select      the expression containing the input string
037:             * @param regex       the regular expression
038:             * @param flags       the flags parameter
039:             * @param matching    actions to be applied to a matching substring
040:             * @param nonMatching actions to be applied to a non-matching substring
041:             * @param pattern     the compiled regular expression, if it was known statically
042:             */
043:            public AnalyzeString(Expression select, Expression regex,
044:                    Expression flags, Expression matching,
045:                    Expression nonMatching, Pattern pattern) {
046:                this .select = select;
047:                this .regex = regex;
048:                this .flags = flags;
049:                this .matching = matching;
050:                this .nonMatching = nonMatching;
051:                this .pattern = pattern;
052:
053:                Iterator kids = iterateSubExpressions();
054:                while (kids.hasNext()) {
055:                    Expression child = (Expression) kids.next();
056:                    adoptChildExpression(child);
057:                }
058:
059:            }
060:
061:            public int getInstructionNameCode() {
062:                return StandardNames.XSL_ANALYZE_STRING;
063:            }
064:
065:            /**
066:             * Get the expression used to process matching substrings
067:             */
068:
069:            public Expression getMatchingExpression() {
070:                return matching;
071:            }
072:
073:            /**
074:             * Get the expression used to process non-matching substrings
075:             */
076:
077:            public Expression getNonMatchingExpression() {
078:                return nonMatching;
079:            }
080:
081:            /**
082:             * Simplify an expression. This performs any static optimization (by rewriting the expression
083:             * as a different expression).
084:             *
085:             * @return the simplified expression
086:             * @throws XPathException if an error is discovered during expression
087:             *                        rewriting
088:             */
089:
090:            public Expression simplify(StaticContext env) throws XPathException {
091:                select = select.simplify(env);
092:                regex = regex.simplify(env);
093:                flags = flags.simplify(env);
094:                if (matching != null) {
095:                    matching = matching.simplify(env);
096:                }
097:                if (nonMatching != null) {
098:                    nonMatching = nonMatching.simplify(env);
099:                }
100:                return this ;
101:            }
102:
103:            public Expression typeCheck(StaticContext env,
104:                    ItemType contextItemType) throws XPathException {
105:                select = select.typeCheck(env, contextItemType);
106:                adoptChildExpression(select);
107:                regex = regex.typeCheck(env, contextItemType);
108:                adoptChildExpression(regex);
109:                flags = flags.typeCheck(env, contextItemType);
110:                adoptChildExpression(flags);
111:                if (matching != null) {
112:                    matching = matching.typeCheck(env, Type.STRING_TYPE);
113:                    adoptChildExpression(matching);
114:                }
115:                if (nonMatching != null) {
116:                    nonMatching = nonMatching.typeCheck(env, Type.STRING_TYPE);
117:                    adoptChildExpression(nonMatching);
118:                }
119:                // Following type checking has already been done in the case of XSLT xsl:analyze-string, but is
120:                // needed where the instruction is generated from saxon:analyze-string extension function
121:                RoleLocator role = new RoleLocator(RoleLocator.INSTRUCTION,
122:                        "analyze-string/select", 0, null);
123:                role.setSourceLocator(this );
124:                select = TypeChecker.staticTypeCheck(select,
125:                        SequenceType.SINGLE_STRING, false, role, env);
126:
127:                role = new RoleLocator(RoleLocator.INSTRUCTION,
128:                        "analyze-string/regex", 0, null);
129:                role.setSourceLocator(this );
130:                regex = TypeChecker.staticTypeCheck(regex,
131:                        SequenceType.SINGLE_STRING, false, role, env);
132:
133:                role = new RoleLocator(RoleLocator.INSTRUCTION,
134:                        "analyze-string/flags", 0, null);
135:                role.setSourceLocator(this );
136:                flags = TypeChecker.staticTypeCheck(flags,
137:                        SequenceType.SINGLE_STRING, false, role, env);
138:
139:                return this ;
140:            }
141:
142:            public Expression optimize(Optimizer opt, StaticContext env,
143:                    ItemType contextItemType) throws XPathException {
144:                select = select.optimize(opt, env, contextItemType);
145:                adoptChildExpression(select);
146:                regex = regex.optimize(opt, env, contextItemType);
147:                adoptChildExpression(regex);
148:                flags = flags.optimize(opt, env, contextItemType);
149:                adoptChildExpression(flags);
150:                if (matching != null) {
151:                    matching = matching.optimize(opt, env, Type.STRING_TYPE);
152:                    adoptChildExpression(matching);
153:                }
154:                if (nonMatching != null) {
155:                    nonMatching = nonMatching.optimize(opt, env,
156:                            Type.STRING_TYPE);
157:                    adoptChildExpression(nonMatching);
158:                }
159:                return this ;
160:            }
161:
162:            /**
163:             * Check that any elements and attributes constructed or returned by this expression are acceptable
164:             * in the content model of a given complex type. It's always OK to say yes, since the check will be
165:             * repeated at run-time. The process of checking element and attribute constructors against the content
166:             * model of a complex type also registers the type of content expected of those constructors, so the
167:             * static validation can continue recursively.
168:             */
169:
170:            public void checkPermittedContents(SchemaType parentType,
171:                    StaticContext env, boolean whole) throws XPathException {
172:                if (matching != null) {
173:                    matching.checkPermittedContents(parentType, env, false);
174:                }
175:                if (nonMatching != null) {
176:                    nonMatching.checkPermittedContents(parentType, env, false);
177:                }
178:            }
179:
180:            /**
181:             * Get the item type of the items returned by evaluating this instruction
182:             *
183:             * @return the static item type of the instruction
184:             * @param th
185:             */
186:
187:            public ItemType getItemType(TypeHierarchy th) {
188:                if (matching != null) {
189:                    if (nonMatching != null) {
190:                        return Type.getCommonSuperType(
191:                                matching.getItemType(th), nonMatching
192:                                        .getItemType(th), th);
193:                    } else {
194:                        return matching.getItemType(th);
195:                    }
196:                } else {
197:                    if (nonMatching != null) {
198:                        return nonMatching.getItemType(th);
199:                    } else {
200:                        return NoNodeTest.getInstance();
201:                    }
202:                }
203:            }
204:
205:            /**
206:             * Compute the dependencies of an expression, as the union of the
207:             * dependencies of its subexpressions. (This is overridden for path expressions
208:             * and filter expressions, where the dependencies of a subexpression are not all
209:             * propogated). This method should be called only once, to compute the dependencies;
210:             * after that, getDependencies should be used.
211:             *
212:             * @return the depencies, as a bit-mask
213:             */
214:
215:            public int computeDependencies() {
216:                // some of the dependencies in the "action" part and in the grouping and sort keys aren't relevant,
217:                // because they don't depend on values set outside the for-each-group expression
218:                int dependencies = 0;
219:                dependencies |= select.getDependencies();
220:                dependencies |= regex.getDependencies();
221:                dependencies |= flags.getDependencies();
222:                if (matching != null) {
223:                    dependencies |= (matching.getDependencies() & ~(StaticProperty.DEPENDS_ON_FOCUS | StaticProperty.DEPENDS_ON_REGEX_GROUP));
224:                }
225:                if (nonMatching != null) {
226:                    dependencies |= (nonMatching.getDependencies() & ~(StaticProperty.DEPENDS_ON_FOCUS | StaticProperty.DEPENDS_ON_REGEX_GROUP));
227:                }
228:                return dependencies;
229:            }
230:
231:            /**
232:             * Handle promotion offers, that is, non-local tree rewrites.
233:             *
234:             * @param offer The type of rewrite being offered
235:             * @throws XPathException
236:             */
237:
238:            protected void promoteInst(PromotionOffer offer)
239:                    throws XPathException {
240:                select = doPromotion(select, offer);
241:                regex = doPromotion(regex, offer);
242:                flags = doPromotion(flags, offer);
243:                if (matching != null) {
244:                    matching = doPromotion(matching, offer);
245:                }
246:                if (nonMatching != null) {
247:                    nonMatching = doPromotion(nonMatching, offer);
248:                }
249:            }
250:
251:            /**
252:             * Get all the XPath expressions associated with this instruction
253:             * (in XSLT terms, the expression present on attributes of the instruction,
254:             * as distinct from the child instructions in a sequence construction)
255:             */
256:
257:            public Iterator iterateSubExpressions() {
258:                ArrayList list = new ArrayList(5);
259:                list.add(select);
260:                list.add(regex);
261:                list.add(flags);
262:                if (matching != null) {
263:                    list.add(matching);
264:                }
265:                if (nonMatching != null) {
266:                    list.add(nonMatching);
267:                }
268:                return list.iterator();
269:            }
270:
271:            public TailCall processLeavingTail(XPathContext context)
272:                    throws XPathException {
273:                RegexIterator iter = getRegexIterator(context);
274:                XPathContextMajor c2 = context.newContext();
275:                c2.setOrigin(this );
276:                c2.setCurrentIterator(iter);
277:                c2.setCurrentRegexIterator(iter);
278:
279:                while (true) {
280:                    Item it = iter.next();
281:                    if (it == null) {
282:                        break;
283:                    }
284:                    if (iter.isMatching()) {
285:                        if (matching != null) {
286:                            matching.process(c2);
287:                        }
288:                    } else {
289:                        if (nonMatching != null) {
290:                            nonMatching.process(c2);
291:                        }
292:                    }
293:                }
294:
295:                return null;
296:
297:            }
298:
299:            /**
300:             * Get an iterator over the substrings defined by the regular expression
301:             *
302:             * @param context the evaluation context
303:             * @return an iterator that returns matching and nonmatching substrings
304:             * @throws XPathException
305:             */
306:
307:            private RegexIterator getRegexIterator(XPathContext context)
308:                    throws XPathException {
309:                String input = select.evaluateAsString(context);
310:
311:                Pattern re = pattern;
312:                if (re == null) {
313:                    int jflags = Matches.setFlags(flags
314:                            .evaluateAsString(context));
315:                    try {
316:                        String javaRegex = RegexTranslator.translate(regex
317:                                .evaluateAsString(context), true);
318:                        re = Pattern.compile(javaRegex, jflags);
319:                    } catch (RegexTranslator.RegexSyntaxException err) {
320:                        throw new DynamicError(err);
321:                    } catch (PatternSyntaxException err) {
322:                        throw new DynamicError(err);
323:                    }
324:                }
325:
326:                RegexIterator iter = new RegexIterator(input, re);
327:                return iter;
328:            }
329:
330:            // TODO: implement an iterate() method (as a MappingIterator).
331:
332:            /**
333:             * Diagnostic print of expression structure. The expression is written to the System.err
334:             * output stream
335:             *
336:             * @param level indentation level for this expression
337:             * @param out
338:             */
339:
340:            public void display(int level, NamePool pool, PrintStream out) {
341:                out.println(ExpressionTool.indent(level) + "analyze-string");
342:                out.println(ExpressionTool.indent(level) + "select = ");
343:                select.display(level + 1, pool, out);
344:                out.println(ExpressionTool.indent(level) + "regex = ");
345:                regex.display(level + 1, pool, out);
346:                out.println(ExpressionTool.indent(level) + "flags = ");
347:                flags.display(level + 1, pool, out);
348:                if (matching != null) {
349:                    out.println(ExpressionTool.indent(level) + "matching = ");
350:                    matching.display(level + 1, pool, out);
351:                }
352:                if (nonMatching != null) {
353:                    out.println(ExpressionTool.indent(level)
354:                            + "non-matching = ");
355:                    nonMatching.display(level + 1, pool, out);
356:                }
357:            }
358:        }
359:
360:        //
361:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
362:        // you may not use this file except in compliance with the License. You may obtain a copy of the
363:        // License at http://www.mozilla.org/MPL/
364:        //
365:        // Software distributed under the License is distributed on an "AS IS" basis,
366:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
367:        // See the License for the specific language governing rights and limitations under the License.
368:        //
369:        // The Original Code is: all this file.
370:        //
371:        // The Initial Developer of the Original Code is Michael H. Kay
372:        //
373:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
374:        //
375:        // Contributor(s):
376:        // Portions marked "e.g." are from Edwin Glaser (edwin@pannenleiter.de)
377:        //
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