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condition-utils

SRFI 12 Condition Utilities

Documentation

Convenience API for constructing common Chicken exception conditions, predicates, and accessors.

Argument Conventions

LOC is a symbol, or #f.

MSG is a string, or #f.

ARGS is a list, or #f.

CALL-CHAIN is the result of (get-call-chain), or #f.

CONDITION is a property-condition.

CONDITION-SPEC is a:

CONDITION

a condition object

symbol

(make-property-condition <symbol>)

list

(apply make-property-condition <list>)

KIND is a symbol.

PROP is a symbol.

Usage

(require-extension condition-utils)

make-exn-condition

[procedure] (make-exn-condition [LOC [MSG [ARGS [CALL-CHAIN]]]]) --> property-condition

Returns an exn property-condition with optional location, arguments, and call-chain property values.

Defaults:

LOC

missing

MSG

"unknown"

ARGS

missing

CALL-CHAIN

missing

Will always include message property in the property-condition.

make-exn-condition+

[procedure] (make-exn-condition+ LOC MSG ARGS [CALL-CHAIN] [CONDITION-SPEC...]) --> property-condition

Returns a composite-condition exn CONDITION-SPEC....

When one-of LOC, MSG, or ARGS is without a useful value in the error context use #f as the actual argument. The optional CALL-CHAIN argument is detected by structure.

When MSG is #f the value "unknown" is used.

make-condition+

[procedure] (make-condition+ CONDITION-SPEC...) --> property-condition

Returns a composite-condition CONDITION-SPEC....

make-condition-predicate

[syntax] (make-condition-predicate KIND...) --> (procedure (*) boolean)

Returns a condition-predicate for KIND....

make-condition-property-accessor

[syntax] (make-condition-property-accessor KIND PROP [DEFAULT]) --> (procedure (*) boolean)

Returns a condition-property-accessor for KIND PROP. The default value of DEFAULT is #f.

condition-irritants

[procedure] (condition-irritants CONDITION) --> list

Returns a list of the condition properties for the condition CONDITION. The form of the list, alist vs. plist, is dependent on the result of the system procedure condition->list.

The properties are without associated condition information.

write-exn-condition

[procedure] (write-exn-condition CONDITION [PORT (current-output-port) [HEADER "Error" [CHAIN-HEADER "\n\tCall history:\n"]]])

Produces on PORT the form:

Error: (<location - if any>) <message - if any>: <arguments - if any>

   +: <condition-kind>: <condition-property> ...
      ... for a composite condition ...

      Call history:
      <call-chain>

The call-chain may not be available.

write-condition

[procedure] (write-condition CONDITION [PORT (current-output-port) [HEADER "Error"]])

Produces on PORT the form:

Error: <condition-kind>: <condition-property> ...

   +: <condition-kind>: <condition-property> ...
      ... for a composite condition ...

condition-predicate*

[procedure] (condition-predicate* KIND) --> (* -> boolean : condition)

Returns a "memoized" condition-predicate for KIND.

condition-property-accessor*

[procedure] (condition-property-accessor* KIND PROP [DEFAULT #f]) --> (condition --> *)

Returns a "memoized" condition-property-accessor for KIND.

Standard Condition Library

Usage

(require-extension standard-conditions)

Condition Predicates

exn-condition?

[procedure] (exn-condition? CONDITION) --> boolean

arity-condition?

[procedure] (arity-condition? CONDITION) --> boolean

type-condition?

[procedure] (type-condition? CONDITION) --> boolean

arithmetic-condition?

[procedure] (arithmetic-condition? CONDITION) --> boolean

i/o-condition?

[procedure] (i/o-condition? CONDITION) --> boolean

file-condition?

[procedure] (file-condition? CONDITION) --> boolean

network-condition?

[procedure] (network-condition? CONDITION) --> boolean

network-timeout-condition?

[procedure] (network-timeout-condition? CONDITION) --> boolean

bounds-condition?

[procedure] (bounds-condition? CONDITION) --> boolean

runtime-condition?

[procedure] (runtime-condition? CONDITION) --> boolean

runtime-limit-condition?

[procedure] (runtime-limit-condition? CONDITION) --> boolean

runtime-cycle-condition?

[procedure] (runtime-cycle-condition? CONDITION) --> boolean

match-condition?

[procedure] (match-condition? CONDITION) --> boolean

syntax-condition?

[procedure] (syntax-condition? CONDITION) --> boolean

process-condition?

[procedure] (process-condition? CONDITION) --> boolean

access-condition?

[procedure] (access-condition? CONDITION) --> boolean

domain-condition?

[procedure] (domain-condition? CONDITION) --> boolean

memory-condition?

[procedure] (memory-condition? CONDITION) --> boolean

Condition Property Accessors

exn-location

[procedure] (exn-location CONDITION) --> *

exn-message

[procedure] (exn-message CONDITION) --> *

exn-arguments

[procedure] (exn-arguments CONDITION) --> *

exn-call-chain

[procedure] (exn-call-chain CONDITION) --> *

HTTP Client Condition Library

Usage

(require-extension http-client-conditions)

Condition Predicates

http-condition?

[procedure] (http-condition? CONDITION) --> boolean

client-error-condition?

[procedure] (client-error-condition? CONDITION) --> boolean

server-error-condition?

[procedure] (server-error-condition? CONDITION) --> boolean

unexpected-server-response-condition?

[procedure] (unexpected-server-response-condition? CONDITION) --> boolean

redirect-depth-exceeded-condition?

[procedure] (redirect-depth-exceeded-condition? CONDITION) --> boolean

unsupported-uri-scheme-condition?

[procedure] (unsupported-uri-scheme-condition? CONDITION) --> boolean

unknown-authtype-condition?

[procedure] (unknown-authtype-condition? CONDITION) --> boolean

Condition Property Accessors

client-error-response

[procedure] (client-error-response CONDITION) --> *

client-error-body

[procedure] (client-error-body CONDITION) --> *

server-error-response

[procedure] (server-error-response CONDITION) --> *

server-error-body

[procedure] (server-error-body CONDITION) --> *

unexpected-server-response-response

[procedure] (unexpected-server-response-response CONDITION) --> *

unexpected-server-response-body

[procedure] (unexpected-server-response-body CONDITION) --> *

redirect-depth-exceeded-uri

[procedure] (redirect-depth-exceeded-uri CONDITION) --> *

formdata-error-condition?

[procedure] (formdata-error-condition? CONDITION) --> boolean

unsupported-uri-scheme-uri-scheme

[procedure] (unsupported-uri-scheme-uri-scheme CONDITION) --> *

unsupported-uri-scheme-request-uri

[procedure] (unsupported-uri-scheme-request-uri CONDITION) --> *

unknown-authtype-authtype

[procedure] (unknown-authtype-authtype CONDITION) --> *

Intarweb Condition Library

Usage

(require-extension intarweb-conditions)

Condition Predicates

http-condition?

[procedure] (http-condition? CONDITION) --> boolean

urlencoded-request-data-limit-exceeded?

[procedure] (urlencoded-request-data-limit-exceeded? CONDITION) --> boolean

line-limit-exceeded?

[procedure] (line-limit-exceeded? CONDITION) --> boolean

header-error?

[procedure] (header-error? CONDITION) --> boolean

header-limit-exceeded?

[procedure] (header-limit-exceeded? CONDITION) --> boolean

unknown-protocol-line?

[procedure] (unknown-protocol-line? CONDITION) --> boolean

unknown-protocol?

[procedure] (unknown-protocol? CONDITION) --> boolean

unknown-code?

[procedure] (unknown-code? CONDITION) --> boolean

unknown-status?

[procedure] (unknown-status? CONDITION) --> boolean

rfc1123-subparser?

[procedure] (rfc1123-subparser? CONDITION) --> boolean

rfc850-subparser?

[procedure] (rfc850-subparser? CONDITION) --> boolean

asctime-subparser?

[procedure] (asctime-subparser? CONDITION) --> boolean

http-date-subparser?

[procedure] (http-date-subparser? CONDITION) --> boolean

unencoded-header?

[procedure] (unencoded-header? CONDITION) --> boolean

username-with-colon?

[procedure] (username-with-colon? CONDITION) --> boolean

Condition Property Accessors

urlencoded-request-data-limit-exceeded-contents

[procedure] (urlencoded-request-data-limit-exceeded-contents CONDITION) --> *

urlencoded-request-data-limit-exceeded-limit

[procedure] (urlencoded-request-data-limit-exceeded-limit CONDITION) --> *

line-limit-exceeded-contents

[procedure] (line-limit-exceeded-contents CONDITION) --> *

line-limit-exceeded-limit

[procedure] (line-limit-exceeded-limit CONDITION) --> *

header-error-contents

[procedure] (header-error-contents CONDITION) --> *

header-limit-exceeded-contents

[procedure] (header-limit-exceeded-contents CONDITION) --> *

header-limit-exceeded-limit

[procedure] (header-limit-exceeded-limit CONDITION) --> *

unknown-protocol-line-line

[procedure] (unknown-protocol-line-line CONDITION) --> *

unknown-protocol-major

[procedure] (unknown-protocol-major CONDITION) --> *

unknown-protocol-minor

[procedure] (unknown-protocol-minor CONDITION) --> *

unknown-code-code

[procedure] (unknown-code-code CONDITION) --> *

unknown-status-status

[procedure] (unknown-status-status CONDITION) --> *

rfc1123-subparser-value?

[procedure] (rfc1123-subparser-value? CONDITION) --> boolean

rfc850-subparser-value?

[procedure] (rfc850-subparser-value? CONDITION) --> boolean

asctime-subparser-value?

[procedure] (asctime-subparser-value? CONDITION) --> boolean

http-date-subparser-value?

[procedure] (http-date-subparser-value? CONDITION) --> boolean

unencoded-header-value?

[procedure] (unencoded-header-value? CONDITION) --> boolean

username-with-colon-value?

[procedure] (username-with-colon-value? CONDITION) --> boolean

Bugs & Limitations

• make-exn-condition, make-exn-condition+, and write-exn-condition should be combined with the "standard-conditions.scm" 'exn' predicate & accessors in own "exn-condition" module.

Notes

• write-exn-condition is from write-exception of https://github.com/dleslie/geiser/blob/master/scheme/chicken/geiser/emacs.scm.

Author

Kon Lovett

Version history

1.5.1

Fix for empty call-chain.

1.5.0

Add types.

1.4.2

Fix #1378

1.4.1

Fix write-exn-condition call-chain header duplication.

1.4.0

Add HEADER to write-exn-condition & write-condition. Add CHAIN-HEADER to write-exn-condition. Follow error form more closely.

1.3.0

write-exn-condition now includes all elements of a composite-condition. Added write-condition.

1.2.0

amended write-exn-condition, add doc for condition libraries.

1.1.1

added write-exn-condition

1.1.0

added make-exn-condition

1.0.4

default exn msg

1.0.3

added call-chain argument & standard conditions

1.0.2

Fix for ticket #630

1.0.1

1.0.0

Hello (from "check-errors:1.11.0")

License

Copyright (C) 2009-2017 Kon Lovett. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ASIS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.