condition-utils | chickadee

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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

make-exn-condition #!optional LOC MSG ARGS CALL-CHAINprocedure

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+

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

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+

make-condition+ CONDITION-SPEC...procedure: Returns a composite-condition CONDITION-SPEC....

make-condition-predicate

(make-condition-predicate KIND...) --> (procedure (*) boolean)syntax: Returns a condition-predicate for KIND....

make-condition-property-accessor

(make-condition-property-accessor KIND PROP [DEFAULT]) --> (procedure (*) boolean)syntax: Returns a condition-property-accessor for KIND PROP. The default value of DEFAULT is #f.

condition-irritants

condition-irritants CONDITIONprocedure

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-condition

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

Produces on PORT the form:

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

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

condition-predicate*

condition-predicate* KINDprocedure: Returns a "memoized" condition-predicate for KIND.

condition-property-accessor*

(condition-property-accessor* KIND PROP [DEFAULT #f]) --> (condition --> *)procedure: Returns a "memoized" condition-property-accessor for KIND.

Standard Condition Library

Usage

(require-extension standard-conditions)

Condition Predicates

Condition Property Accessors

exn-arguments

exn-arguments CONDITIONprocedure

exn-call-chain

exn-call-chain CONDITIONprocedure

HTTP Client Condition Library

Usage

(require-extension http-client-conditions)

Condition Predicates

http-condition?

http-condition? CONDITIONprocedure

client-error-condition?

client-error-condition? CONDITIONprocedure

server-error-condition?

server-error-condition? CONDITIONprocedure

unexpected-server-response-condition?

unexpected-server-response-condition? CONDITIONprocedure

redirect-depth-exceeded-condition?

redirect-depth-exceeded-condition? CONDITIONprocedure

unsupported-uri-scheme-condition?

unsupported-uri-scheme-condition? CONDITIONprocedure

unknown-authtype-condition?

unknown-authtype-condition? CONDITIONprocedure

Condition Property Accessors

client-error-response

client-error-response CONDITIONprocedure

client-error-body

client-error-body CONDITIONprocedure

server-error-response

server-error-response CONDITIONprocedure

server-error-body

server-error-body CONDITIONprocedure

unexpected-server-response-response

unexpected-server-response-response CONDITIONprocedure

unexpected-server-response-body

unexpected-server-response-body CONDITIONprocedure

redirect-depth-exceeded-uri

redirect-depth-exceeded-uri CONDITIONprocedure

formdata-error-condition?

formdata-error-condition? CONDITIONprocedure

unsupported-uri-scheme-uri-scheme

unsupported-uri-scheme-uri-scheme CONDITIONprocedure

unsupported-uri-scheme-request-uri

unsupported-uri-scheme-request-uri CONDITIONprocedure

unknown-authtype-authtype

unknown-authtype-authtype CONDITIONprocedure

Intarweb Condition Library

Usage

(require-extension intarweb-conditions)

Condition Predicates

http-condition?

http-condition? CONDITIONprocedure

urlencoded-request-data-limit-exceeded?

urlencoded-request-data-limit-exceeded? CONDITIONprocedure

line-limit-exceeded?

line-limit-exceeded? CONDITIONprocedure

header-error?

header-error? CONDITIONprocedure

header-limit-exceeded?

header-limit-exceeded? CONDITIONprocedure

unknown-protocol-line?

unknown-protocol-line? CONDITIONprocedure

unknown-protocol?

unknown-protocol? CONDITIONprocedure

unknown-code?

unknown-code? CONDITIONprocedure

unknown-status?

unknown-status? CONDITIONprocedure

rfc1123-subparser?

rfc1123-subparser? CONDITIONprocedure

rfc850-subparser?

rfc850-subparser? CONDITIONprocedure

asctime-subparser?

asctime-subparser? CONDITIONprocedure

http-date-subparser?

http-date-subparser? CONDITIONprocedure

unencoded-header?

unencoded-header? CONDITIONprocedure

username-with-colon?

username-with-colon? CONDITIONprocedure

Condition Property Accessors

urlencoded-request-data-limit-exceeded-contents

urlencoded-request-data-limit-exceeded-contents CONDITIONprocedure

urlencoded-request-data-limit-exceeded-limit

urlencoded-request-data-limit-exceeded-limit CONDITIONprocedure

line-limit-exceeded-contents

line-limit-exceeded-contents CONDITIONprocedure

line-limit-exceeded-limit

line-limit-exceeded-limit CONDITIONprocedure

header-error-contents

header-error-contents CONDITIONprocedure

header-limit-exceeded-contents

header-limit-exceeded-contents CONDITIONprocedure

header-limit-exceeded-limit

header-limit-exceeded-limit CONDITIONprocedure

unknown-protocol-line-line

unknown-protocol-line-line CONDITIONprocedure

unknown-protocol-major

unknown-protocol-major CONDITIONprocedure

unknown-protocol-minor

unknown-protocol-minor CONDITIONprocedure

unknown-code-code

unknown-code-code CONDITIONprocedure

unknown-status-status

unknown-status-status CONDITIONprocedure

rfc1123-subparser-value?

rfc1123-subparser-value? CONDITIONprocedure

rfc850-subparser-value?

rfc850-subparser-value? CONDITIONprocedure

asctime-subparser-value?

asctime-subparser-value? CONDITIONprocedure

http-date-subparser-value?

http-date-subparser-value? CONDITIONprocedure

unencoded-header-value?

unencoded-header-value? CONDITIONprocedure

username-with-colon-value?

username-with-colon-value? CONDITIONprocedure

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.

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")

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