D Common Modules

D.18 LaTeXML::Common::Error

Error and Progress Reporting and Logging support.


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.


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


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..


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


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


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.


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.