(get-throw-context t)
Returns the throw context for an object thrown by throw or throw+ given a Throwable t. Allows callers to access information about any thrown object as a Clojure map.
If t or any Throwable in its cause chain wraps a non-Throwable object thrown by throw+, returns the associated context with t assoc'd as the value for :throwable, and the wrapper assoc'd as the value for :wrapper, else returns a new context based on t.
Within a try+ catch clause, prefer using the &throw-context local to calling get-throw-context explicitly.
A throw context is a map containing:
for Throwable objects: :object the object; :message the message, from .getMessage; :cause the cause, from .getCause; :stack-trace the stack trace, from .getStackTrace; :throwable the object;
for non-Throwable objects: :object the object; :message the message, see throw+; :cause the cause, see throw+; :stack-trace the stack trace, see throw+; :environment the environment, see throw+; :wrapper the Throwable wrapper that carried the object, see below; :throwable the outermost Throwable whose cause chain contains the wrapper, see below;
To throw a non-Throwable object, throw+ wraps it in a Throwable wrapper. The wrapper is available via the :wrapper key in the throw context.
Between being thrown and caught, the wrapper may be wrapped by other exceptions (e.g., instances of RuntimeException or java.util.concurrent.ExecutionException). get-throw-context searches all nested wrappers to find the thrown object. The outermost wrapper is available via the :throwable key in the throw context.
See also try+
Returns the throw context for an object thrown by throw or throw+ given a Throwable t. Allows callers to access information about any thrown object as a Clojure map. If t or any Throwable in its cause chain wraps a non-Throwable object thrown by throw+, returns the associated context with t assoc'd as the value for :throwable, and the wrapper assoc'd as the value for :wrapper, else returns a new context based on t. Within a try+ catch clause, prefer using the &throw-context local to calling get-throw-context explicitly. A throw context is a map containing: - for Throwable objects: :object the object; :message the message, from .getMessage; :cause the cause, from .getCause; :stack-trace the stack trace, from .getStackTrace; :throwable the object; - for non-Throwable objects: :object the object; :message the message, see throw+; :cause the cause, see throw+; :stack-trace the stack trace, see throw+; :environment the environment, see throw+; :wrapper the Throwable wrapper that carried the object, see below; :throwable the outermost Throwable whose cause chain contains the wrapper, see below; To throw a non-Throwable object, throw+ wraps it in a Throwable wrapper. The wrapper is available via the :wrapper key in the throw context. Between being thrown and caught, the wrapper may be wrapped by other exceptions (e.g., instances of RuntimeException or java.util.concurrent.ExecutionException). get-throw-context searches all nested wrappers to find the thrown object. The outermost wrapper is available via the :throwable key in the throw context. See also try+
(get-thrown-object t)
Returns the object thrown by throw or throw+ given a Throwable. Useful for processing a Throwable outside of a try+ form when the source of the Throwable may or may not have been throw+.
See also get-throw-context
Returns the object thrown by throw or throw+ given a Throwable. Useful for processing a Throwable outside of a try+ form when the source of the Throwable may or may not have been throw+. See also get-throw-context
(throw+)
(throw+ object)
(throw+ object message)
(throw+ object fmt arg & args)
Like the throw special form, but can throw any object by wrapping non-Throwable objects in a Throwable wrapper.
throw+ has the same syntax and behavior as throw for Throwable objects. The message, cause, and stack trace are those carried by the Throwable.
For non-Throwable objects, throw+ packages the object, message, cause, stack trace, and environment in a Throwable wrapper:
message: optional, specified either by a string or a format string and args for clojure.core/format:
% symbols (at any nesting depth) within args represent the thrown object
the default is: "throw+: %s" (pr-str %)
cause: for a throw+ call within a try+ catch clause, the cause is the outermost wrapper of the caught object being processed. In any other case, the cause is nil;
stack trace: the stack trace of the current thread at the time of the throw+ call, starting at the function that encloses it;
environment: a map from names to values for locals visible at the throw+ call site, including the enclosing function and its arguments (unless shadowed by nested locals).
Within a try+ catch clause, a throw+ call with no arguments rethrows the caught object within its original (possibly nested) wrappers.
See also try+, get-throw-context
Like the throw special form, but can throw any object by wrapping non-Throwable objects in a Throwable wrapper. throw+ has the same syntax and behavior as throw for Throwable objects. The message, cause, and stack trace are those carried by the Throwable. For non-Throwable objects, throw+ packages the object, message, cause, stack trace, and environment in a Throwable wrapper: - message: optional, specified either by a string or a format string and args for clojure.core/format: - % symbols (at any nesting depth) within args represent the thrown object - the default is: "throw+: %s" (pr-str %) - cause: for a throw+ call within a try+ catch clause, the cause is the outermost wrapper of the caught object being processed. In any other case, the cause is nil; - stack trace: the stack trace of the current thread at the time of the throw+ call, starting at the function that encloses it; - environment: a map from names to values for locals visible at the throw+ call site, including the enclosing function and its arguments (unless shadowed by nested locals). Within a try+ catch clause, a throw+ call with no arguments rethrows the caught object within its original (possibly nested) wrappers. See also try+, get-throw-context
(try+ & body)
Like the try special form, but with enhanced catch clauses:
catch non-Throwable objects thrown by throw+ as well as Throwable objects thrown by throw or throw+;
specify objects to catch by class name, key-values, predicate, or arbitrary selector form;
destructure the caught object;
in a catch clause, access the names and values of the locals visible at the throw site, including the name of the enclosing function and its arguments (unless shadowed by nested locals).
A selector form is a form containing one or more instances of % to be replaced by the thrown object. If it evaluates to truthy, the object is caught.
The class name, key-values, and predicate selectors are shorthand for these selector forms:
<class name> => (instance? <class name> %)
[<key> <val> & <kvs>] => (and (= (get % <key>) <val>) ...)
<predicate> => (<predicate> %)
The binding form in a try+ catch clause is not required to be a simple symbol. It is subject to destructuring which allows easy access to the contents of a thrown collection.
The local &throw-context is available within try+ catch clauses, bound to the throw context for the caught object.
See also: throw+, get-throw-context
Like the try special form, but with enhanced catch clauses: - catch non-Throwable objects thrown by throw+ as well as Throwable objects thrown by throw or throw+; - specify objects to catch by class name, key-values, predicate, or arbitrary selector form; - destructure the caught object; - in a catch clause, access the names and values of the locals visible at the throw site, including the name of the enclosing function and its arguments (unless shadowed by nested locals). A selector form is a form containing one or more instances of % to be replaced by the thrown object. If it evaluates to truthy, the object is caught. The class name, key-values, and predicate selectors are shorthand for these selector forms: <class name> => (instance? <class name> %) [<key> <val> & <kvs>] => (and (= (get % <key>) <val>) ...) <predicate> => (<predicate> %) The binding form in a try+ catch clause is not required to be a simple symbol. It is subject to destructuring which allows easy access to the contents of a thrown collection. The local &throw-context is available within try+ catch clauses, bound to the throw context for the caught object. See also: throw+, get-throw-context
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