.cstr_combine_errors {constructive}

Combine errors

Description

Exported for custom constructor design. This function allows combining independent checks so information is given about all failing checks rather than the first one. All parameters except ... are forwarded to rlang::abort()

Usage

.cstr_combine_errors(
  ...,
  class = NULL,
  call,
  header = NULL,
  body = NULL,
  footer = NULL,
  trace = NULL,
  parent = NULL,
  use_cli_format = NULL,
  .internal = FALSE,
  .file = NULL,
  .frame = parent.frame(),
  .trace_bottom = NULL
)

Arguments

...

check expressions

class

Subclass of the condition.

call

The execution environment of a currently running function, e.g. call = caller_env(). The corresponding function call is retrieved and mentioned in error messages as the source of the error.

You only need to supply call when throwing a condition from a helper function which wouldn't be relevant to mention in the message.

Can also be NULL or a defused function call to respectively not display any call or hard-code a code to display.

For more information about error calls, see Including function calls in error messages.

header

An optional header to precede the errors

body, footer

Additional bullets.

trace

A trace object created by trace_back().

parent

Supply parent when you rethrow an error from a condition handler (e.g. with try_fetch()).

• If parent is a condition object, a chained error is created, which is useful when you want to enhance an error with more details, while still retaining the original information.

• If parent is NA, it indicates an unchained rethrow, which is useful when you want to take ownership over an error and rethrow it with a custom message that better fits the surrounding context.

  Technically, supplying NA lets abort() know it is called from a condition handler. This helps it create simpler backtraces where the condition handling context is hidden by default.

For more information about error calls, see Including contextual information with error chains.

use_cli_format

Whether to format message lazily using cli if available. This results in prettier and more accurate formatting of messages. See local_use_cli() to set this condition field by default in your package namespace.

If set to TRUE, message should be a character vector of individual and unformatted lines. Any newline character "\\n" already present in message is reformatted by cli's paragraph formatter. See Formatting messages with cli.

.internal

If TRUE, a footer bullet is added to message to let the user know that the error is internal and that they should report it to the package authors. This argument is incompatible with footer.

.file

A connection or a string specifying where to print the message. The default depends on the context, see the stdout vs stderr section.

.frame

The throwing context. Used as default for .trace_bottom, and to determine the internal package to mention in internal errors when .internal is TRUE.

.trace_bottom

Used in the display of simplified backtraces as the last relevant call frame to show. This way, the irrelevant parts of backtraces corresponding to condition handling (tryCatch(), try_fetch(), abort(), etc.) are hidden by default. Defaults to call if it is an environment, or .frame otherwise. Without effect if trace is supplied.

Value

Returns NULL invisibly, called for side effects.