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The XSLT and XQuery Processor
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
package net.sf.saxon.lib;
import net.sf.saxon.expr.EarlyEvaluationContext;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.expr.parser.XPathParser;
import net.sf.saxon.s9api.*;
import net.sf.saxon.trans.Err;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.trans.XmlProcessingException;
import net.sf.saxon.transpile.CSharpReplaceBody;
import net.sf.saxon.tree.AttributeLocation;
import net.sf.saxon.type.ValidationException;
import org.xml.sax.SAXParseException;
import javax.xml.transform.SourceLocator;
import javax.xml.transform.TransformerException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.HashSet;
import java.util.Set;
/**
* StandardErrorReporter is the standard error handler for processing XSLT and XQuery static
* errors, used if no other error handler is nominated.
*/
public class StandardErrorReporter
extends StandardDiagnostics
implements ErrorReporter {
//private int recoveryPolicy = Configuration.RECOVER_WITH_WARNINGS;
//private int requestedRecoveryPolicy = Configuration.RECOVER_WITH_WARNINGS;
private int warningCount = 0;
private int maximumNumberOfWarnings = 25;
private int errorCount = 0;
private int maximumNumberOfErrors = 1000;
private int maxOrdinaryCharacter = 255;
private int stackTraceDetail = 2;
private final Set warningsIssued = new HashSet<>();
protected transient Logger logger = new StandardLogger();
private XmlProcessingError latestError;
private boolean outputErrorCodes = true;
/**
* Create a Standard Error Reporter
*/
public StandardErrorReporter() {
}
/**
* Set output destination for error messages (default is System.err)
*
* @param logger The Logger to use for error messages
*/
public void setLogger(Logger logger) {
this.logger = logger;
}
/**
* Get the error output stream
*
* @return the error output stream
*/
public Logger getLogger() {
return logger;
}
/**
* Set the maximum number of warnings that are reported; further warnings after this limit
* are silently ignored
*
* @param max the maximum number of warnings output
*/
public void setMaximumNumberOfWarnings(int max) {
this.maximumNumberOfWarnings = max;
}
/**
* Get the maximum number of warnings that are reported; further warnings after this limit
* are silently ignored
*
* @return the maximum number of warnings output
*/
public int getMaximumNumberOfWarnings() {
return this.maximumNumberOfWarnings;
}
/**
* Set the maximum number of errors that are reported; further errors after this limit
* result in the compilation being abandoned
*
* @param max the maximum number of errors output before the compilation is abandoned
*/
public void setMaximumNumberOfErrors(int max) {
this.maximumNumberOfErrors = max;
}
/**
* Get the maximum number of errors that are reported; further errors after this limit
* result in the compilation being abandoned
*
* @return the maximum number of errors output before the compilation is abandoned
*/
public int getMaximumNumberOfErrors() {
return this.maximumNumberOfErrors;
}
/**
* Set the maximum codepoint value for a character to be considered non-special.
* Special characters (codepoints above this value) will be expanded in hex for
* extra clarity in the error message.
* @param max the highest codepoint considered non-special (defaults to 255)
*/
public void setMaxOrdinaryCharacter(int max) {
maxOrdinaryCharacter = max;
}
/**
* Get the maximum codepoint value for a character to be considered non-special.
* Special characters (codepoints above this value) will be expanded in hex for
* extra clarity in the error message.
*
* @return the highest codepoint considered non-special (defaults to 255)
*/
public int getMaxOrdinaryCharacter() {
return maxOrdinaryCharacter;
}
/**
* Set the level of information to be included in a stack trace when a dynamic
* error occurs.
*
* @param level set to 0 (zero) for no stack trace; 1 (one) for a stack trace
* showing the templates and functions being executed; 2 (two) to
* add values of local variables and parameters (available in Saxon-EE only)
* Default is the maximum level available.
*/
public void setStackTraceDetail(int level) {
stackTraceDetail = level;
}
/**
* Get the level of information to be included in a stack trace when a dynamic
* error occurs.
*
* @return 0 (zero) for no stack trace; 1 (one) for a stack trace
* showing the templates and functions being executed; 2 (two) to
* add values of local variables and parameters (available in Saxon-EE only)
* Default is the maximum level available.
*/
public int getStackTraceDetail() {
return stackTraceDetail;
}
/**
* Say whether error codes should be included in the message. This is normally suppressed during
* schema processing because the error codes (such as FORG0001) are generally useless.
* @param include if true (the default), then error codes are included in the message
*/
public void setOutputErrorCodes(boolean include) {
this.outputErrorCodes = include;
}
/**
* Report an error or warning
*
* @param processingError the error or warning being reported
*/
@Override
public void report(XmlProcessingError processingError) {
if (processingError != latestError) {
latestError = processingError;
if (processingError.isWarning()) {
warning(processingError);
} else {
error(processingError);
}
}
}
/**
* Receive notification of a warning.
* Transformers can use this method to report conditions that
* are not errors or fatal errors. The default behaviour is to
* take no action.
* After invoking this method, the Transformer must continue with
* the transformation. It should still be possible for the
* application to process the document through to the end.
*
* @param error The warning information encapsulated in a
* transformer exception.
* @see TransformerException
*/
protected void warning(XmlProcessingError error) {
if (logger == null) {
logger = new StandardLogger();
}
String message = constructMessage(error, "", "Warning ");
if (!warningsIssued.contains(message)) {
logger.warning(message);
warningCount++;
if (warningCount > getMaximumNumberOfWarnings()) {
logger.info("No more warnings will be displayed");
}
warningsIssued.add(message);
}
}
/**
* Ask whether the error listener is reporting warnings. (If it isn't, the caller
* can save the effort of constructing one; which is significant because it's represented
* by an exception, and constructing exceptions is expensive).
* @return true if the error listener is ignoring warnings, perhaps because the threshold
* on the number of warnings has been exceeded.
*/
public boolean isReportingWarnings() {
return warningCount < getMaximumNumberOfWarnings();
}
/**
* Receive notification of an error.
*
* After calling this method to report a static error, the compiler will normally
* continue to detect and report further errors, but the method can abort the
* compilation by calling {@link XmlProcessingError#setTerminationMessage(String)}
*
* @param err The error information.
*/
protected void error(XmlProcessingError err) {
if (errorCount++ > maximumNumberOfErrors) {
err.setTerminationMessage("Too many errors reported");
}
if (logger == null) {
logger = new StandardLogger();
}
String message;
HostLanguage lang = err.getHostLanguage();
String langText = "";
if (lang != HostLanguage.UNKNOWN) {
switch (lang) {
case XSLT:
break;
case XQUERY:
langText = "in query ";
break;
case XPATH:
langText = "in expression ";
break;
case XML_SCHEMA:
langText = "in schema ";
break;
case XSLT_PATTERN:
langText = "in pattern ";
break;
}
}
String kind = "Error ";
if (err.isTypeError()) {
kind = "Type error ";
} else if (err.isStaticError()) {
kind = "Static error ";
}
message = constructMessage(err, langText, kind);
logger.error(message);
if (err instanceof XmlProcessingException) {
XPathException exception = ((XmlProcessingException)err).getXPathException();
XPathContext context = exception.getXPathContext();
if (context != null && !(context instanceof EarlyEvaluationContext)) {
outputStackTrace(logger, context);
}
}
}
/**
* Construct an error or warning message.
* The default implementation outputs a two-line message: the first line is obtained
* by calling {@link #constructFirstLine(XmlProcessingError, String, String)},
* the second by calling {@link #constructSecondLine(XmlProcessingError)}; these are
* concatenated with a newline and two spaces separating them.
* @param exception the exception originally reported to the ErrorListener
* @param langText a string such as "in expression" or "in query" identifying the kind of
* construct that is in error
* @param kind the kind of error, for example "Syntax error", "Static error", "Type error"
* @return the constructed message
*/
public String constructMessage(XmlProcessingError exception, String langText, String kind) {
return constructFirstLine(exception, langText, kind)
+ "\n "
+ constructSecondLine(exception);
}
/**
* Construct the first line of the error or warning message. This typically contains
* information about the kind of error that occurred, and the location where it occurred
* @param error the error originally reported to the ErrorReporter
* @param langText a string such as "in expression" or "in query" identifying the kind of
* construct that is in error
* @param kind the kind of error, for example "Syntax error", "Static error", "Type error"
* @return the constructed message
*/
public String constructFirstLine(XmlProcessingError error, String langText, String kind) {
Location locator = error.getLocation();
if (locator instanceof AttributeLocation) {
return kind + langText + getLocationMessageText(locator);
} else if (locator instanceof XPathParser.NestedLocation) {
XPathParser.NestedLocation nestedLoc = (XPathParser.NestedLocation)locator;
Location outerLoc = nestedLoc.getContainingLocation();
int line = nestedLoc.getLocalLineNumber();
int column = nestedLoc.getColumnNumber();
String lineInfo = line <= 0 ? "" : "on line " + line + ' ';
String columnInfo = column < 0 ? "" : "at " + (line <= 0 ? "char " : "column ") + column + ' ';
String nearBy = nestedLoc.getNearbyText();
Expression failingExpression = null;
String extraContext = formatExtraContext(failingExpression, nearBy);
if (outerLoc instanceof AttributeLocation) {
// Typical XSLT case
String innerLoc = lineInfo + extraContext + columnInfo;
return kind + innerLoc + langText + getLocationMessageText(outerLoc);
} else {
// Typical XQuery case; no extra information available from the outer location
String innerLoc = lineInfo + columnInfo;
if (outerLoc.getLineNumber() > 1) {
innerLoc += "(" + langText + "on line " + outerLoc.getLineNumber() + ") ";
}
if (outerLoc.getSystemId() != null) {
innerLoc += "of " + outerLoc.getSystemId() + " ";
}
return kind + extraContext + innerLoc;
}
} else {
return kind + getLocationMessage(error);
}
}
/**
* Create extra context information for locating the error from knowledge of the
* containing expression or the nearby text retained by the tokenizer
* @param failingExpression the subexpression in which the failure occurs (possibly null)
* @param nearBy text from the input buffer near the error, retained by the tokenizer
* (possible null)
* @return a message with extra context information, or an empty string if nothing is
* available.
*/
public String formatExtraContext(Expression failingExpression, String nearBy) {
if (failingExpression != null) {
if (failingExpression.isCallOn(net.sf.saxon.functions.Error.class)) {
return "signaled by call to error() ";
} else {
return "evaluating (" + failingExpression.toShortString() + ") ";
}
} else if (nearBy != null && !nearBy.isEmpty()) {
return (nearBy.startsWith("...") ? "near" : "in") +
' ' + Err.wrap(nearBy) + " ";
} else {
return "";
}
}
/**
* Construct the second line of the error message. This contains the error code,
* error object (if applicable) and the textual message.
* The default implementation depends on the kind of exception:
*
* - For a {@link ValidationException}, it constructs a message containing
* the error message together with explanations of which XSD Schema constraint
* was violated;
* - For other exceptions, it returns a string comprising two characters
* of indentation, followed by the result of calling {@link #getExpandedMessage(XmlProcessingError)}
* and then formatting the result using {@link #wordWrap(String)} and {@link #expandSpecialCharacters(String)}.
*
* @param err the original reported exception
* @return the string to be used as the second line of the error message
*/
public String constructSecondLine(XmlProcessingError err) {
return expandSpecialCharacters(wordWrap(getExpandedMessage(err)));
}
/**
* Get a string identifying the location of an error.
*
* The default implementation first tries to get a {@link SourceLocator}
* object from this exception or from any nested exception, and then,
* if a {@code SourceLocator} is found, calls {@link #getLocationMessageText(SourceLocator)}
* to format the location information.
*
* @param err the exception containing the location information
* @return a message string describing the location
*/
protected String getLocationMessage(XmlProcessingError err) {
Location loc = err.getLocation();
return getLocationMessageText(loc);
}
/**
* Get a string containing the message for this exception and all contained exceptions.
*
* The default implementation outputs the concatenation (with space-separation) of:
*
*
* - The error code, formatted using {@link #formatErrorCode(XmlProcessingError)}
* - The message associated with this exception, and with all nested exceptions,
* formatted using {@link #formatNestedMessages(XmlProcessingError, String)}
*
*
* @param err the exception containing the required information
* @return a message that concatenates the message of this exception with its contained exceptions,
* also including information about the error code and location.
*/
public String getExpandedMessage(XmlProcessingError err) {
String message = formatErrorCode(err) + " " + err.getMessage();
message = formatNestedMessages(err, message);
return message;
}
/**
* Construct a message by combining the message from the top-level exception
* plus any messages associated with nested exceptions
* The default implementation outputs the supplied message, followed by the
* messages from any nested (contained) exceptions, colon-separated, with
* some attempt to remove duplicated messages and certain redundant message prefixes
* (such as "net.sf.saxon.trans.XPathException: " and "TRaX Transform Exception")
* @param err the original reported exception
* @param message the message as constructed so far, containing the error code,
* error object, and the message from the original reported exception
* @return an expanded message containing the supplied message followed by messages
* from any contained exceptions.
*/
public String formatNestedMessages(XmlProcessingError err, String message) {
if (err.getCause() == null) {
return message;
} else {
StringBuilder sb = new StringBuilder(message);
Throwable e = err.getCause();
while (e != null) {
if (!(isSAXParseException(e))) {
if (e instanceof RuntimeException) {
StringWriter sw = new StringWriter();
appendStackTrace(e, sw);
sb.append('\n').append(sw);
} else {
sb.append(". Caused by ").append(e.getClass().getName());
}
}
String next = e.getMessage();
if (next != null) {
sb.append(": ").append(next);
}
e = e.getCause();
}
return sb.toString();
}
}
@CSharpReplaceBody(code="sw.WriteLine(e.StackTrace);")
private void appendStackTrace(Throwable e, StringWriter sw) {
e.printStackTrace(new PrintWriter(sw));
}
@SuppressWarnings({"", "PointlessBooleanExpression"})
private boolean isSAXParseException(Throwable err) {
return false
|| err instanceof SAXParseException
;
}
/**
* Format the error code contained in the supplied exception object
* @param err the exception object. The default implementation looks for an error
* code both in this object (if it is an {@link XPathException}) or in
* any wrapped {@code XPathException}. The default implementation ignores
* the namespace part of the error code (which is in general a QName) if it
* is the standard namespace {@link NamespaceConstant#ERR}; otherwise it displays
* the code in the format {@code prefix:localName}.
* @return a string representation of the error code, followed by a trailing space if non-empty;
* returns a zero-length string if outputErrorCodes is false.
*/
public String formatErrorCode(XmlProcessingError err) {
if (outputErrorCodes) {
QName qCode = err.getErrorCode();
if (qCode != null) {
if (qCode.getNamespaceURI().equals(NamespaceConstant.ERR)) {
return qCode.getLocalName() + " ";
} else {
return qCode.toString() + " ";
}
}
}
return "";
}
/**
* Expand any special characters appearing in a message. Special characters
* will be output as themselves, followed by a hex codepoint in the form [xHHHHH].
* Characters are considered special if they have a codepoint above the value set
* using {@link #setMaxOrdinaryCharacter(int)}. The default implementation returns
* the message unchanged if the registered {@link Logger} is unicode-aware.
*
* This method is provided because a number of operating systems cannot display
* arbitrary Unicode characters on the system console, or cannot do so unless the console
* has been specially configured. The simplest way to prevent messages being expanded
* in this way is to mark the logger as being unicode-aware.
*
* If messages are expanded, then they will be expanded using the method
* {@link #expandSpecialCharacters(String, int)}, which can be overridden
* to define the actual format in which special characters are displayed.
*
* @param in the message to be expanded
* @return the expanded message
*/
public String expandSpecialCharacters(String in) {
if (logger.isUnicodeAware()) {
return in;
} else {
return expandSpecialCharacters(in, maxOrdinaryCharacter);
}
}
/**
* Generate a stack trace. This method is protected so it can be overridden in a subclass.
*
* @param out the destination for the stack trace
* @param context the context (which holds the information to be output)
*/
protected void outputStackTrace(Logger out, XPathContext context) {
logStackTrace(context, out, stackTraceDetail);
}
}