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Refine error handling text #816

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Aug 26, 2024
Merged

Refine error handling text #816

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ebd08e3
Refine error handling text
eemeli Jul 8, 2024
4ca923a
Apply suggestions from code review
eemeli Jul 10, 2024
316331f
Update fallback text
eemeli Jul 29, 2024
180d045
Turn bullet point list into paragraphs
eemeli Jul 29, 2024
45bd2bb
Be more mighty
eemeli Jul 29, 2024
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19 changes: 16 additions & 3 deletions spec/errors.md
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Expand Up @@ -24,9 +24,22 @@ or _Message Function Errors_ in _expressions_ that are not otherwise used by the
such as _placeholders_ in unselected _patterns_
or _declarations_ that are never referenced during _formatting_.

In all cases, when encountering a runtime error,
a message formatter MUST provide some representation of the message.
An informative error or errors MUST also be separately provided.
When formatting a _message_ with one or more errors,
an implementation MUST provide a mechanism to discover and identify
at least one of the errors.
The exact form of error signaling is implementation defined.
Some examples include throwing an exception,
returning an error code,
or providing a function or method for enumerating any errors.

For all _messages_ without _Syntax Errors_ or _Data Model Errors_,
an implementation MUST enable a user to get a formatted result.
The formatted result might include _fallback values_
such as when a _placeholder_'s _expression_ produced an error
during formatting.

The two above requirements MAY be fulfilled by a single formatting method,
or separately by more than one such method.

When a message contains more than one error,
or contains some error which leads to further errors,
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5 changes: 2 additions & 3 deletions spec/formatting.md
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Expand Up @@ -735,9 +735,8 @@ each _text_ and _placeholder_ part of the selected _pattern_ is resolved and for

Resolved values cannot always be formatted by a given implementation.
When such an error occurs during _formatting_,
an implementation SHOULD emit an appropriate _Message Function Error_ and produce a
_fallback value_ for the _placeholder_ that produced the error.
A formatting function MAY substitute a value to use instead of a _fallback value_.
an implementation MUST emit an appropriate _Message Function Error_ and use a
_fallback value_ for the _placeholder_ with the error.

Implementations MAY represent the result of _formatting_ using the most
appropriate data type or structure. Some examples of these include:
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