markup-error condition?


When the XML or SGML parser finds an error in the markup it is processing, OmniMark logs a markup error message and parsing continues. If you want to take control of reporting markup errors, you can write a markup-error rule.

The built-in variables #class, #error-code, #message, #additional-info, #recovery-info, #file-name, and #line-number provide data on the current error. You can use them to do your own error reporting. For example:

    output "\message{%g(#message) on line %d(#line-number)"
    output "%n%g(#additional-info)"
           when #additional-info is attached
    output "}"

If you want to have OmniMark perform its own logging in addition to the error reporting you are doing yourself, use the log keyword in your markup-error rule:

    output "\message{%g(#message) on line %d(#line-number)"
    output "%n%g(#additional-info)"
           when #additional-info is attached
    output "}"

If there is more than one markup-error rule in an OmniMark program, the first markup-error rule with no condition or a condition of "true" is performed.

markup-error rules are not affected by rule group selection.

Note that a markup error is not a program error. The occurrence of a markup error has no effect on the flow of your program, unless you cause that effect in a markup-error rule. Markup errors do not cause throws to #program-error or #external-exception. Note that if you throw out of a markup-error rule, this will abort the current parse.

The parts of the error message produced by the SGML or XML parser are available in the markup-error rule in the following built-in local variables:

  • #error-code
  • #class
  • #message
  • #additional-info
  • #recovery-info
  • #file-name
  • #line-number

Warning (#class = 0) reports are always passed to markup-error rules, even if the "-warning" command-line option has not been used. The OmniMark program can ignore warnings by, for example, using the following condition:

  markup-error unless #class = 0

Specifying "log" in a markup-error rule has no effect on warning reports unless the command-line option "-warning" is given. The actions in the selected markup-error rule, however, will still be performed.

markup-error replaces sgml-error, which is now deprecated.

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