1.4 Diagnostics
1.4 Diagnostics
During execution, FunnelWeb proceeds cautiously with each of
its phases, only proceeding with the next phase if the previous
phase has been successful. This means that, when debugging a
FunnelWeb file, you may find that the number of errors
  after you fix some of them, as you will be exposing
yourself to the next FunnelWeb phase.
FunnelWeb employs five levels of diagnostics at different
1 Introduction
levels of severity. Severity is defined in terms of the level of
2 Interface
activity at which the diagnostic causes FunnelWeb to abort.
3 Scanner
 A warning does not cause FunnelWeb
4 Parser
to terminate or curtail its operation in any way, but
5 Analyser
serves merely to warn the user of particular
6 Tangle
conditions that might be symptomatic of deeper
7 Weave
8 Shell
 An error causes FunnelWeb to terminate
9 Commands
processing of the current input file at the end of the
current phase. For example, if an error occurs
10 Glossary
during scanning, FunnelWeb will continue
11 References
scanning (and possibly generate further scanning
diagnostics), but will not invoke the parser.
Severe Error:
 A severe error (or "severe" for
short) is the same as an error except that
FunnelWeb terminates the current phase
Fatal Error:
 A fatal error causes FunnelWeb not
only to terminate the current phase and run
immediately, but also to terminate total
FunnelWeb processing immediately. A severe
error will not cause a FunnelWeb script to
terminate, but a fatal error will. A fatal error
causes FunnelWeb to return control to the
operating system.
Assertion Error:
 An assertion error occurs if
FunnelWeb detects an internal inconsistency, in
which case FunnelWeb terminates immediately
and ungracefully. Such an error can occur only if
there are bugs in FunnelWeb. With luck, such
errors will be extremely rare.
http://www.ross.net/funnelweb/reference/intro_diagnostics.html (1 of 2) [3/3/2000 10:49:33 PM]

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