Source Code Cross Referenced for Matches.java in  » XML » XPath-Saxon » net » sf » saxon » functions » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.functions 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.functions;
002:
003:        import net.sf.saxon.expr.Expression;
004:        import net.sf.saxon.expr.StaticContext;
005:        import net.sf.saxon.expr.XPathContext;
006:        import net.sf.saxon.om.Item;
007:        import net.sf.saxon.trans.DynamicError;
008:        import net.sf.saxon.trans.StaticError;
009:        import net.sf.saxon.trans.XPathException;
010:        import net.sf.saxon.type.RegexTranslator;
011:        import net.sf.saxon.value.AtomicValue;
012:        import net.sf.saxon.value.BooleanValue;
013:        import net.sf.saxon.value.StringValue;
014:        import net.sf.saxon.value.Value;
015:
016:        import java.util.regex.Pattern;
017:        import java.util.regex.PatternSyntaxException;
018:
019:        /**
020:         * This class implements the matches() function for regular expression matching
021:         */
022:
023:        public class Matches extends SystemFunction {
024:
025:            private Pattern regexp;
026:
027:            /**
028:             * Simplify and validate.
029:             * This is a pure function so it can be simplified in advance if the arguments are known
030:             * @return the simplified expression
031:             * @throws net.sf.saxon.trans.StaticError if any error is found (e.g. invalid regular expression)
032:             */
033:
034:            public Expression simplify(StaticContext env) throws XPathException {
035:                Expression e = simplifyArguments(env);
036:
037:                // compile the regular expression once if possible
038:                if (!(e instanceof  Value)) {
039:                    try {
040:                        regexp = Matches.tryToCompile(argument, 1, 2);
041:                    } catch (StaticError err) {
042:                        err.setLocator(this );
043:                        throw err;
044:                    }
045:                }
046:
047:                return e;
048:            }
049:
050:            /**
051:             * Set the Java flags from the supplied XPath flags.
052:             * @param inFlags the flags as a string, e.g. "im"
053:             * @return the flags as a bit-significant integer
054:             * @throws net.sf.saxon.trans.StaticError if the supplied value is invalid
055:             */
056:
057:            public static int setFlags(CharSequence inFlags) throws StaticError {
058:                int flags = Pattern.UNIX_LINES;
059:                for (int i = 0; i < inFlags.length(); i++) {
060:                    char c = inFlags.charAt(i);
061:                    switch (c) {
062:                    case 'm':
063:                        flags |= Pattern.MULTILINE;
064:                        break;
065:                    case 'i':
066:                        flags |= Pattern.CASE_INSENSITIVE;
067:                        flags |= Pattern.UNICODE_CASE;
068:                        break;
069:                    case 's':
070:                        flags |= Pattern.DOTALL;
071:                        break;
072:                    case 'x':
073:                        flags |= Pattern.COMMENTS; // note, this enables comments as well as whitespace
074:                        break;
075:                    default:
076:                        StaticError err = new StaticError("Invalid character '"
077:                                + c + "' in regular expression flags");
078:                        err.setErrorCode("FORX0001");
079:                        throw err;
080:                    }
081:                }
082:                return flags;
083:            }
084:
085:            /**
086:             * Try to precompile the arguments to the function. This method is shared by
087:             * the implementations of the three XPath functions matches(), replace(), and
088:             * tokenize().
089:             * @param args the supplied arguments to the function, as an array
090:             * @param patternArg the position of the argument containing the regular expression
091:             * @param flagsArg the position of the argument containing the flags
092:             * @return the compiled regular expression, or null indicating that the information
093:             * is not available statically so it cannot be precompiled
094:             * @throws net.sf.saxon.trans.StaticError if any failure occurs, in particular, if the regular
095:             * expression is invalid
096:             */
097:
098:            protected static Pattern tryToCompile(Expression[] args,
099:                    int patternArg, int flagsArg) throws StaticError {
100:                if (patternArg > args.length - 1) {
101:                    // too few arguments were supplied; the error will be reported in due course
102:                    return null;
103:                }
104:                CharSequence flagstr = null;
105:                if (args.length - 1 < flagsArg) {
106:                    flagstr = "";
107:                } else if (args[flagsArg] instanceof  StringValue) {
108:                    flagstr = ((StringValue) args[flagsArg]).getStringValueCS();
109:                }
110:
111:                if (args[patternArg] instanceof  StringValue && flagstr != null) {
112:                    int flags = Matches.setFlags(flagstr);
113:
114:                    try {
115:                        String javaRegex = RegexTranslator.translate(
116:                                ((StringValue) args[patternArg])
117:                                        .getStringValueCS(), true);
118:                        return Pattern.compile(javaRegex, flags);
119:                    } catch (RegexTranslator.RegexSyntaxException err) {
120:                        StaticError e2 = new StaticError(err.getMessage());
121:                        e2.setErrorCode("FORX0002");
122:                        throw e2;
123:                    } catch (PatternSyntaxException err) {
124:                        StaticError e2 = new StaticError(err.getMessage());
125:                        e2.setErrorCode("FORX0002");
126:                        throw e2;
127:                    }
128:                } else {
129:                    return null;
130:                }
131:            }
132:
133:            /**
134:             * Evaluate the matches() function to give a Boolean value.
135:             * @param c  The dynamic evaluation context
136:             * @return the result as a BooleanValue, or null to indicate the empty sequence
137:             * @throws XPathException on an error
138:             */
139:
140:            public Item evaluateItem(XPathContext c) throws XPathException {
141:                AtomicValue sv0 = (AtomicValue) argument[0].evaluateItem(c);
142:                if (sv0 == null) {
143:                    sv0 = StringValue.EMPTY_STRING;
144:                }
145:                ;
146:
147:                Pattern re = regexp;
148:                if (re == null) {
149:
150:                    AtomicValue pat = (AtomicValue) argument[1].evaluateItem(c);
151:                    if (pat == null)
152:                        return null;
153:
154:                    CharSequence flags;
155:                    if (argument.length == 2) {
156:                        flags = "";
157:                    } else {
158:                        AtomicValue sv2 = (AtomicValue) argument[2]
159:                                .evaluateItem(c);
160:                        if (sv2 == null)
161:                            return null;
162:                        flags = sv2.getStringValueCS();
163:                    }
164:
165:                    try {
166:                        String javaRegex = RegexTranslator.translate(pat
167:                                .getStringValueCS(), true);
168:                        re = Pattern.compile(javaRegex, setFlags(flags));
169:                    } catch (RegexTranslator.RegexSyntaxException err) {
170:                        DynamicError de = new DynamicError(err);
171:                        de.setErrorCode("FORX0002");
172:                        de.setXPathContext(c);
173:                        throw de;
174:                    } catch (PatternSyntaxException err) {
175:                        DynamicError de = new DynamicError(err);
176:                        de.setErrorCode("FORX0002");
177:                        de.setXPathContext(c);
178:                        throw de;
179:                    } catch (StaticError serr) {
180:                        dynamicError(serr.getMessage(), serr
181:                                .getErrorCodeLocalPart(), c);
182:                    }
183:                }
184:                return BooleanValue.get(re.matcher(sv0.getStringValueCS())
185:                        .find());
186:            }
187:
188:            /**
189:             * Temporary test rig, used to submit bug report to Sun
190:             */
191:            //     public static void main(String[] args) throws Exception {
192:            //
193:            //        matches("\u212a", "K");
194:            //        matches("\u212a", "[A-Z]");
195:            //        matches("\u212a", "I|J|K|L");
196:            //        matches("\u212a", "[IJKL]");
197:            //        matches("\u212a", "k");
198:            //        matches("\u212a", "[a-z]");
199:            //        matches("\u212a", "i|j|k|l");
200:            //        matches("\u212a", "[ijkl]");
201:            //    }
202:            //
203:            //    private static void matches(String in, String pattern) {
204:            //        System.err.println("Java version " + System.getProperty("java.version"));
205:            //        int flags = Pattern.UNIX_LINES;
206:            //        flags |= Pattern.CASE_INSENSITIVE;
207:            //        flags |= Pattern.UNICODE_CASE;
208:            //        Pattern p = Pattern.compile(pattern, flags);
209:            //        boolean b = p.matcher(in).find();
210:            //        System.err.println("Pattern " + pattern + ": " + (b ? " match" : "no match"));
211:            //    }
212:            //    Results of this test with JDK 1.5.0_05:
213:            //
214:            //    Pattern K:  match
215:            //    Java version 1.5.0_05
216:            //    Pattern [A-Z]: no match
217:            //    Java version 1.5.0_05
218:            //    Pattern I|J|K|L:  match
219:            //    Java version 1.5.0_05
220:            //    Pattern [IJKL]: no match
221:            //    Java version 1.5.0_05
222:            //    Pattern k:  match
223:            //    Java version 1.5.0_05
224:            //    Pattern [a-z]:  match
225:            //    Java version 1.5.0_05
226:            //    Pattern i|j|k|l:  match
227:            //    Java version 1.5.0_05
228:            //    Pattern [ijkl]: no match
229:        }
230:
231:        //
232:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
233:        // you may not use this file except in compliance with the License. You may obtain a copy of the
234:        // License at http://www.mozilla.org/MPL/
235:        //
236:        // Software distributed under the License is distributed on an "AS IS" basis,
237:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
238:        // See the License for the specific language governing rights and limitations under the License.
239:        //
240:        // The Original Code is: all this file.
241:        //
242:        // The Initial Developer of the Original Code is Michael H. Kay
243:        //
244:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
245:        //
246:        // Contributor(s): none.
247:        //
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