tryKeepConditions: tryKeepConditions

In AnalysisPageServer: A framework for sharing interactive data and plots from R through the web

Description

Try-catch wrapper, keeping error traceback and conditions

Usage

tryKeepConditions(expr)

Arguments

expr	Expression to evaluate

Details

This is a try-catch wrapper. It returns a list with four elements:

$value

The value of the evaluated expression, or NULL if an error was thrown and execution did not complete

$messages

A list of message objects, each being a message thrown during the execution, in order

$warnings

A list of condition objects, each being a message thrown during the execution, in order

$error

NULL if there was no error, otherwise the error object, which can then be passed to getTraceback to retrieve the error

The elements of the $messages, $warnings and $error are all actually two-element lists, the first being the condition object itself (named $message, $warning or $error) and the second begin the call stack as returned by sys.calls() and named $calls.

The class of this object is set as "AnalysisPageValueWithConditions"

Value

AnalysisPageValueWithConditions

Author(s)

Brad Friedman

See Also

vwc.is.error

vwc.conditions vwc.error vwc.error.condition vwc.error.traceback vwc.is.error vwc.messages vwc.messages.conditions vwc.messages.tracebacks vwc.n vwc.n.messages vwc.n.warnings vwc.tracebacks vwc.value vwc.warnings vwc.warnings.conditions vwc.warnings.tracebacks

Examples

value.with.warning <- tryKeepConditions({warning("warning message"); 3})
value.with.error <- tryKeepConditions({stop("err message")})

AnalysisPageServer documentation built on April 28, 2020, 6:32 p.m.