DESCRIPTION

"LaTeXML::Common::Error" does some simple stack analysis to generate more informative, readable, error messages for LaTeXML. Its routines are used by the error reporting methods from LaTeXML::Global, namely "Warn", "Error" and "Fatal".

Error Reporting

The Error reporting functions all take a similar set of arguments, the differences are in the implied severity of the situation, and in the amount of detail that will be reported.

The $category is a string naming a broad category of errors, such as ``undefined''. The set is open-ended, but see the manual for a list of recognized categories. $object is the object whose presence or lack caused the problem.

$where indicates where the problem occurred; passs in the $gullet or $stomach if the problem occurred during expansion or digestion; pass in a document node if it occurred there. A string will be used as is; if an undefined value is used, the error handler will try to guess.

The $message should be a somewhat concise, but readable, explanation of the problem, but ought to not refer to the document or any ``incident specific'' information, so as to support indexing in build systems. @details provides additional lines of information that may be indident specific.

"Fatal($category,$object,$where,$message,@details);"

Signals an fatal error, printing $message along with some context. In verbose mode a stack trace is printed.

"Error($category,$object,$where,$message,@details);"

Signals an error, printing $message along with some context. If in strict mode, this is the same as Fatal(). Otherwise, it attempts to continue processing..

"Warn($category,$object,$where,$message,@details);"

Prints a warning message along with a short indicator of the input context, unless verbosity is quiet.

"Info($category,$object,$where,$message,@details);"

Prints an informational message along with a short indicator of the input context, unless verbosity is quiet.

"NoteProgress($message);"

Prints $message unless the verbosity level below 0. Typically just a short mark to indicate motion, but can be longer; provide your own newlines, if needed.

"NoteProgressDetailed($message);"

Like "NoteProgress", but for noiser progress, only prints when verbosity >= 1.

Internal Functions

No user serviceable parts inside. These symbols are not exported.

"$string = LaTeXML::Common::Error::generateMessage($typ,$msg,$lng,@more);"

Constructs an error or warning message based on the current stack and the current location in the document. $typ is a short string characterizing the type of message, such as ``Error''. $msg is the error message itself. If $lng is true, will generate a more verbose message; this also uses the VERBOSITY set in the $STATE. Longer messages will show a trace of the objects invoked on the stack, @more are additional strings to include in the message.

"$string = LaTeXML::Common::Error::stacktrace;"

Return a formatted string showing a trace of the stackframes up until this function was invoked.

"@objects = LaTeXML::Common::Error::objectStack;"

Return a list of objects invoked on the stack. This procedure only considers those stackframes which involve methods, and the objects are those (unique) objects that the method was called on.

AUTHOR

Bruce Miller <[email protected]>

COPYRIGHT

Public domain software, produced as part of work done by the United States Government & not subject to copyright in the US.