31 lines
1.6 KiB
Factor
Executable File
31 lines
1.6 KiB
Factor
Executable File
USING: help.syntax help.markup words ;
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IN: descriptive
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HELP: DESCRIPTIVE:
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{ $syntax "DESCRIPTIVE: word ( inputs -- outputs ) definition ;" }
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{ $description "Defines a word such that, if an error is thrown from within it, that error is wrapped in a " { $link descriptive-error } " with the arguments to that word." } ;
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HELP: DESCRIPTIVE::
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{ $syntax "DESCRIPTIVE:: word ( inputs -- outputs ) definition ;" }
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{ $description "Defines a word which uses locals such that, if an error is thrown from within it, that error is wrapped in a " { $link descriptive-error } " with the arguments to that word." } ;
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HELP: descriptive-error
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{ $error-description "The class of errors wrapping another error (in the underlying slot) which were thrown in a word (in the word slot) with a given set of arguments (in the args slot)." } ;
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HELP: make-descriptive
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{ $values { "word" word } }
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{ $description "Makes the word wrap errors in " { $link descriptive-error } " instances." } ;
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ARTICLE: "descriptive" "Descriptive errors"
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"This vocabulary defines automatic descriptive errors. Using it, you can define a word which acts as normal, except when it throws an error, the error is wrapped in an instance of a class:"
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{ $subsection descriptive-error }
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"The wrapper contains the word itself, the input parameters, as well as the original error."
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$nl
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"To annotate an existing word with descriptive error checking:"
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{ $subsection make-descriptive }
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"To define words which throw descriptive errors, use the following words:"
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{ $subsection POSTPONE: DESCRIPTIVE: }
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{ $subsection POSTPONE: DESCRIPTIVE:: } ;
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ABOUT: "descriptive"
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