Source Code Cross Referenced for XSLAnalyzeString.java in  » XML » XPath-Saxon » net » sf » saxon » style » 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.style 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.style;
002:
003:        import net.sf.saxon.expr.*;
004:        import net.sf.saxon.functions.Matches;
005:        import net.sf.saxon.instruct.AnalyzeString;
006:        import net.sf.saxon.instruct.Executable;
007:        import net.sf.saxon.om.AttributeCollection;
008:        import net.sf.saxon.om.Axis;
009:        import net.sf.saxon.om.AxisIterator;
010:        import net.sf.saxon.om.NodeInfo;
011:        import net.sf.saxon.trans.XPathException;
012:        import net.sf.saxon.type.ItemType;
013:        import net.sf.saxon.type.RegexTranslator;
014:        import net.sf.saxon.value.SequenceType;
015:        import net.sf.saxon.value.StringValue;
016:
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 XSLAnalyzeString extends StyleElement {
025:
026:            private Expression select;
027:            private Expression regex;
028:            private Expression flags;
029:            private StyleElement matching;
030:            private StyleElement nonMatching;
031:            private Pattern pattern;
032:
033:            /**
034:             * Determine whether this node is an instruction.
035:             * @return true - it is an instruction
036:             */
037:
038:            public boolean isInstruction() {
039:                return true;
040:            }
041:
042:            /**
043:             * Determine whether this type of element is allowed to contain an xsl:fallback
044:             * instruction
045:             */
046:
047:            public boolean mayContainFallback() {
048:                return true;
049:            }
050:
051:            /**
052:             * Determine the type of item returned by this instruction (only relevant if
053:             * it is an instruction).
054:             * @return the item type returned
055:             */
056:
057:            protected ItemType getReturnedItemType() {
058:                return getCommonChildItemType();
059:            }
060:
061:            public void prepareAttributes() throws XPathException {
062:                String selectAtt = null;
063:                String regexAtt = null;
064:                String flagsAtt = null;
065:
066:                AttributeCollection atts = getAttributeList();
067:
068:                for (int a = 0; a < atts.getLength(); a++) {
069:                    int nc = atts.getNameCode(a);
070:                    String f = getNamePool().getClarkName(nc);
071:                    if (f == StandardNames.REGEX) {
072:                        regexAtt = atts.getValue(a);
073:                    } else if (f == StandardNames.SELECT) {
074:                        selectAtt = atts.getValue(a);
075:                    } else if (f == StandardNames.FLAGS) {
076:                        flagsAtt = atts.getValue(a).trim();
077:                    } else {
078:                        checkUnknownAttribute(nc);
079:                    }
080:                }
081:
082:                if (selectAtt == null) {
083:                    reportAbsence("select");
084:                    selectAtt = "."; // for error recovery
085:                }
086:                select = makeExpression(selectAtt);
087:
088:                if (regexAtt == null) {
089:                    reportAbsence("regex");
090:                    regexAtt = "xxx"; // for error recovery
091:                }
092:                regex = makeAttributeValueTemplate(regexAtt);
093:
094:                if (flagsAtt == null) {
095:                    flagsAtt = "";
096:                }
097:                flags = makeAttributeValueTemplate(flagsAtt);
098:
099:                if (regex instanceof  StringValue
100:                        && flags instanceof  StringValue) {
101:                    int jflags = 0;
102:                    try {
103:                        jflags = Matches.setFlags(((StringValue) flags)
104:                                .getStringValueCS());
105:                    } catch (XPathException err) {
106:                        compileError(
107:                                "Invalid value of flags attribute: " + err,
108:                                "XTDE1145");
109:                        jflags = 0;
110:                    }
111:                    try {
112:                        String javaRegex = RegexTranslator.translate(
113:                                ((StringValue) regex).getStringValueCS(), true);
114:                        pattern = Pattern.compile(javaRegex, jflags);
115:                        if (pattern.matcher("").matches()) {
116:                            invalidRegex(
117:                                    "The regular expression must not be one that matches a zero-length string",
118:                                    "XTDE1150");
119:                        }
120:                    } catch (RegexTranslator.RegexSyntaxException err) {
121:                        invalidRegex("Error in regular expression: " + err,
122:                                "XTDE1140");
123:                    } catch (PatternSyntaxException err) {
124:                        invalidRegex("Error in regular expression: " + err,
125:                                "XTDE1140");
126:                    }
127:                }
128:
129:            }
130:
131:            private void invalidRegex(String message, String errorCode)
132:                    throws XPathException {
133:                //        if (forwardsCompatibleModeIsEnabled()) {
134:                //            pattern = null;     // defer the error until run-time
135:                //        } else {
136:                compileError(message, errorCode);
137:                pattern = null;
138:                //        }
139:            }
140:
141:            public void validate() throws XPathException {
142:                checkWithinTemplate();
143:
144:                AxisIterator kids = iterateAxis(Axis.CHILD);
145:                while (true) {
146:                    NodeInfo curr = (NodeInfo) kids.next();
147:                    if (curr == null) {
148:                        break;
149:                    }
150:                    if (curr instanceof  XSLFallback) {
151:                        // no-op
152:                    } else if (curr instanceof  XSLMatchingSubstring) {
153:                        boolean b = curr.getLocalPart().equals(
154:                                "matching-substring");
155:                        if (b) {
156:                            if (matching != null) {
157:                                compileError(
158:                                        "xsl:matching-substring element must only appear once",
159:                                        "XTSE0010");
160:                            }
161:                            matching = (StyleElement) curr;
162:                        } else {
163:                            if (nonMatching != null) {
164:                                compileError(
165:                                        "xsl:non-matching-substring element must only appear once",
166:                                        "XTSE0010");
167:                            }
168:                            nonMatching = (StyleElement) curr;
169:                        }
170:                    } else {
171:                        compileError(
172:                                "Only xsl:matching-substring and xsl:non-matching-substring are allowed here",
173:                                "XTSE0010");
174:                    }
175:                }
176:
177:                if (matching == null && nonMatching == null) {
178:                    compileError(
179:                            "At least one xsl:matching-substring or xsl:non-matching-substring element must be present",
180:                            "XTSE1130");
181:                }
182:
183:                select = typeCheck("select", select);
184:                regex = typeCheck("regex", regex);
185:                flags = typeCheck("flags", flags);
186:
187:                try {
188:                    RoleLocator role = new RoleLocator(RoleLocator.INSTRUCTION,
189:                            "xsl:analyze-string/select", 0, null);
190:                    ExpressionLocation locator = new ExpressionLocation(this );
191:                    role.setSourceLocator(locator);
192:                    select = TypeChecker.staticTypeCheck(select,
193:                            SequenceType.SINGLE_STRING, false, role,
194:                            getStaticContext());
195:
196:                    role = new RoleLocator(RoleLocator.INSTRUCTION,
197:                            "xsl:analyze-string/regex", 0, null);
198:                    role.setSourceLocator(locator);
199:                    regex = TypeChecker.staticTypeCheck(regex,
200:                            SequenceType.SINGLE_STRING, false, role,
201:                            getStaticContext());
202:
203:                    role = new RoleLocator(RoleLocator.INSTRUCTION,
204:                            "xsl:analyze-string/flags", 0, null);
205:                    role.setSourceLocator(locator);
206:                    flags = TypeChecker.staticTypeCheck(flags,
207:                            SequenceType.SINGLE_STRING, false, role,
208:                            getStaticContext());
209:                } catch (XPathException err) {
210:                    compileError(err);
211:                }
212:
213:            }
214:
215:            public Expression compile(Executable exec) throws XPathException {
216:                Expression matchingBlock = null;
217:                if (matching != null) {
218:                    matchingBlock = matching.compileSequenceConstructor(exec,
219:                            matching.iterateAxis(Axis.CHILD), false);
220:                }
221:
222:                Expression nonMatchingBlock = null;
223:                if (nonMatching != null) {
224:                    nonMatchingBlock = nonMatching.compileSequenceConstructor(
225:                            exec, nonMatching.iterateAxis(Axis.CHILD), false);
226:                }
227:
228:                try {
229:                    AnalyzeString anal = new AnalyzeString(select, regex,
230:                            flags, (matchingBlock == null ? null
231:                                    : matchingBlock.simplify(matching
232:                                            .getStaticContext())),
233:                            (nonMatchingBlock == null ? null : nonMatchingBlock
234:                                    .simplify(nonMatching.getStaticContext())),
235:                            pattern);
236:                    ExpressionTool.makeParentReferences(anal);
237:                    return anal;
238:                } catch (XPathException e) {
239:                    compileError(e);
240:                    return null;
241:                }
242:            }
243:
244:        }
245:
246:        //
247:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
248:        // you may not use this file except in compliance with the License. You may obtain a copy of the
249:        // License at http://www.mozilla.org/MPL/
250:        //
251:        // Software distributed under the License is distributed on an "AS IS" basis,
252:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
253:        // See the License for the specific language governing rights and limitations under the License.
254:        //
255:        // The Original Code is: all this file.
256:        //
257:        // The Initial Developer of the Original Code is Michael H. Kay
258:        //
259:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
260:        //
261:        // Contributor(s):
262:        // Portions marked "e.g." are from Edwin Glaser (edwin@pannenleiter.de)
263:        //
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