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|
(.module:
[library
[lux (#- if loop)
["$" documentation (#+ documentation:)]
[data
[text (#+ \n)
["%" format (#+ format)]]]
[macro
["." template]]]]
[\\library
["." /]])
(documentation: /.Exception
"An exception provides a way to decorate error messages.")
(documentation: /.match?
"Is this exception the cause of the error message?"
[(match? exception error)])
(documentation: /.when
(format "If a particular exception is detected on a possibly-erroneous value, handle it."
\n "If no exception was detected, or a different one from the one being checked, then pass along the original value.")
[(when exception then try)])
(documentation: /.otherwise
"If no handler could be found to catch the exception, then run a function as a last-resort measure."
[(otherwise else try)])
(documentation: /.error
"Constructs an error message from an exception."
[(error exception message)])
(documentation: /.except
"Decorate an error message with an Exception and lift it into the error-handling context."
[(except exception message)])
(documentation: /.exception:
(format "Define a new exception type."
\n "It mostly just serves as a way to tag error messages for later catching.")
["Simple case:"
(exception: .public some_exception)]
["Complex case:"
(exception: .public [arbitrary type variables] (some_exception {optional Text} {arguments Int})
optional_body)])
(documentation: /.report
"An error report."
[(: Text
(report ["Row 0" value/0]
["Row 1" value/1]
,,,
["Row N" value/N]))])
(documentation: /.listing
(format "A numbered report of the entries on a list."
\n "NOTE: 0-based numbering.")
[(listing format entries)])
(documentation: /.with
"If a computation fails, prepends the exception to the error."
[(with exception message computation)])
(.def: .public documentation
(.List $.Module)
($.module /._
"Pure-Lux exception-handling functionality."
[..Exception
..match?
..when
..otherwise
..error
..except
..exception:
..report
..listing
..with
($.default /.assertion)]
[]))
|
