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Article contents:[[tags: egg]] == condition-utils SRFI 12 Condition Utilities [[toc:]] == 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}}. {{KIND}} is usually a {{symbol}} but not {{#f}}. {{PROP}} is usually a {{symbol}} but not {{#f}}. {{CONDITION-SPEC}} is a: ; {{CONDITION}} : a condition object ; {{atom}} : {{(make-property-condition <atom>)}} ;see KIND ; {{list}} : {{(apply make-property-condition <list>)}} ;(KIND PROP VALUE ...) === Condition Library ==== Usage <enscript language=scheme> (import condition-utils) </enscript> ==== make-condition+ <procedure>(make-condition+ CONDITION-SPEC...) -> property-condition</procedure> Returns a {{composite-condition}} {{CONDITION-SPEC...}}. ==== make-condition-predicate <syntax>(make-condition-predicate KIND...) -> (procedure (*) boolean)</syntax> Returns a {{condition-predicate}} for {{KIND...}}. ; {{KIND}} : {{symbol}} ;argument is quoted! ==== condition-predicate* <procedure>(condition-predicate* KIND) -> (* -> boolean : condition)</procedure> Returns a "memoized" {{condition-predicate}} for {{KIND}}. ; {{KIND}} : {{(not false)}} ;argument is evaluated ==== make-condition-property-accessor <syntax>(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}}. ; {{KIND}} : {{symbol}} ;argument is quoted! ; {{PROP}} : {{symbol}} ;argument is quoted! ==== condition-property-accessor* <procedure>(condition-property-accessor* KIND PROP [DEFAULT #f]) -> (condition -> *)</procedure> Returns a "memoized" {{condition-property-accessor}} for {{KIND}}. ; {{KIND}} : {{(not false)}} ;argument is evaluated ; {{PROP}} : {{(not false)}} ;argument is evaluated ==== condition-irritants <procedure>(condition-irritants CONDITION) -> list</procedure> 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}}. ; CHICKEN 4 : alist ; CHICKEN 5 : plist The properties are without associated condition information. ==== write-condition <procedure>(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 ... === EXN Condition Library ==== Usage <enscript language=scheme> (import exn-condition) </enscript> ==== make-exn-condition <procedure>(make-exn-condition [LOC [MSG [ARGS [CALL-CHAIN [ERRNO]]]]]) -> property-condition</procedure> Returns an {{exn}} {{property-condition}} with optional {{location}}, {{arguments}}, {{call-chain}}, and {{errno}} property values. Defaults: ; {{LOC}} : missing ; {{MSG}} : {{"unknown"}} ; {{ARGS}} : missing ; {{CALL-CHAIN}} : missing ; {{ERRNO}} : missing Will always include {{message}} property in the {{property-condition}}. ==== make-exn-condition* <procedure>(make-exn-condition* [location:] [message:] [arguments:] [call-chain:] [errno:]) -> property-condition</procedure> Returns an {{exn}} {{property-condition}} with optional {{location}}, {{arguments}}, {{call-chain}}, and {{errno}} property values. Defaults: ; {{location}} : missing ; {{message}} : {{"unknown"}} ; {{arguments}} : missing ; {{call-chain:}} : missing ; {{errno}} : missing Will always include {{message}} property in the {{property-condition}}. ==== make-exn-condition+ <procedure>(make-exn-condition+ LOC MSG ARGS [CALL-CHAIN] [ERRNO] [CONDITION-SPEC...]) -> property-condition</procedure> 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}} & {{ERRNO}} arguments are detected by type & structure. When {{MSG}} is {{#f}} the value {{"unknown"}} is used. ==== write-exn-condition <procedure>(write-exn-condition CONDITION [PORT (current-output-port) [HEADER "Error" [CHAIN-HEADER "\n\tCall history:\n"]]])</procedure> 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. ===== exn-condition? <procedure>(exn-condition? CONDITION) -> boolean</procedure> ===== exn-location <procedure>(exn-location CONDITION) -> *</procedure> ===== exn-message <procedure>(exn-message CONDITION) -> *</procedure> ===== exn-arguments <procedure>(exn-arguments CONDITION) -> *</procedure> ===== exn-call-chain <procedure>(exn-call-chain CONDITION) -> *</procedure> ===== exn-errno <procedure>(exn-errno CONDITION) -> *</procedure> === Standard Condition Library ==== Usage <enscript language=scheme> (import standard-conditions) </enscript> ==== Condition Predicates ===== arity-condition? <procedure>(arity-condition? CONDITION) -> boolean</procedure> ===== type-condition? <procedure>(type-condition? CONDITION) -> boolean</procedure> ===== arithmetic-condition? <procedure>(arithmetic-condition? CONDITION) -> boolean</procedure> ===== i/o-condition? <procedure>(i/o-condition? CONDITION) -> boolean</procedure> ===== file-condition? <procedure>(file-condition? CONDITION) -> boolean</procedure> ===== network-condition? <procedure>(network-condition? CONDITION) -> boolean</procedure> ===== network-timeout-condition? <procedure>(network-timeout-condition? CONDITION) -> boolean</procedure> ===== bounds-condition? <procedure>(bounds-condition? CONDITION) -> boolean</procedure> ===== runtime-condition? <procedure>(runtime-condition? CONDITION) -> boolean</procedure> ===== runtime-limit-condition? <procedure>(runtime-limit-condition? CONDITION) -> boolean</procedure> ===== runtime-cycle-condition? <procedure>(runtime-cycle-condition? CONDITION) -> boolean</procedure> ===== match-condition? <procedure>(match-condition? CONDITION) -> boolean</procedure> ===== syntax-condition? <procedure>(syntax-condition? CONDITION) -> boolean</procedure> ===== process-condition? <procedure>(process-condition? CONDITION) -> boolean</procedure> ===== access-condition? <procedure>(access-condition? CONDITION) -> boolean</procedure> ===== domain-condition? <procedure>(domain-condition? CONDITION) -> boolean</procedure> ===== memory-condition? <procedure>(memory-condition? CONDITION) -> boolean</procedure> === HTTP Client Condition Library ==== Usage <enscript language=scheme> (import http-client-conditions) </enscript> ==== Condition Predicates ===== http-condition? <procedure>(http-condition? CONDITION) -> boolean</procedure> ===== client-error-condition? <procedure>(client-error-condition? CONDITION) -> boolean</procedure> ===== server-error-condition? <procedure>(server-error-condition? CONDITION) -> boolean</procedure> ===== unexpected-server-response-condition? <procedure>(unexpected-server-response-condition? CONDITION) -> boolean</procedure> ===== redirect-depth-exceeded-condition? <procedure>(redirect-depth-exceeded-condition? CONDITION) -> boolean</procedure> ===== unsupported-uri-scheme-condition? <procedure>(unsupported-uri-scheme-condition? CONDITION) -> boolean</procedure> ===== unknown-authtype-condition? <procedure>(unknown-authtype-condition? CONDITION) -> boolean</procedure> ==== Condition Property Accessors ===== client-error-response <procedure>(client-error-response CONDITION) -> *</procedure> ===== client-error-body <procedure>(client-error-body CONDITION) -> *</procedure> ===== server-error-response <procedure>(server-error-response CONDITION) -> *</procedure> ===== server-error-body <procedure>(server-error-body CONDITION) -> *</procedure> ===== unexpected-server-response-response <procedure>(unexpected-server-response-response CONDITION) -> *</procedure> ===== unexpected-server-response-body <procedure>(unexpected-server-response-body CONDITION) -> *</procedure> ===== redirect-depth-exceeded-uri <procedure>(redirect-depth-exceeded-uri CONDITION) -> *</procedure> ===== formdata-error-condition? <procedure>(formdata-error-condition? CONDITION) -> boolean</procedure> ===== unsupported-uri-scheme-uri-scheme <procedure>(unsupported-uri-scheme-uri-scheme CONDITION) -> *</procedure> ===== unsupported-uri-scheme-request-uri <procedure>(unsupported-uri-scheme-request-uri CONDITION) -> *</procedure> ===== unknown-authtype-authtype <procedure>(unknown-authtype-authtype CONDITION) -> *</procedure> === Intarweb Condition Library ==== Usage <enscript language=scheme> (import intarweb-conditions) </enscript> ==== Condition Predicates ===== http-condition? <procedure>(http-condition? CONDITION) -> boolean</procedure> ===== urlencoded-request-data-limit-exceeded? <procedure>(urlencoded-request-data-limit-exceeded? CONDITION) -> boolean</procedure> ===== line-limit-exceeded? <procedure>(line-limit-exceeded? CONDITION) -> boolean</procedure> ===== header-error? <procedure>(header-error? CONDITION) -> boolean</procedure> ===== header-limit-exceeded? <procedure>(header-limit-exceeded? CONDITION) -> boolean</procedure> ===== unknown-protocol-line? <procedure>(unknown-protocol-line? CONDITION) -> boolean</procedure> ===== unknown-protocol? <procedure>(unknown-protocol? CONDITION) -> boolean</procedure> ===== unknown-code? <procedure>(unknown-code? CONDITION) -> boolean</procedure> ===== unknown-status? <procedure>(unknown-status? CONDITION) -> boolean</procedure> ===== rfc1123-subparser? <procedure>(rfc1123-subparser? CONDITION) -> boolean</procedure> ===== rfc850-subparser? <procedure>(rfc850-subparser? CONDITION) -> boolean</procedure> ===== asctime-subparser? <procedure>(asctime-subparser? CONDITION) -> boolean</procedure> ===== http-date-subparser? <procedure>(http-date-subparser? CONDITION) -> boolean</procedure> ===== unencoded-header? <procedure>(unencoded-header? CONDITION) -> boolean</procedure> ===== username-with-colon? <procedure>(username-with-colon? CONDITION) -> boolean</procedure> ==== Condition Property Accessors ===== urlencoded-request-data-limit-exceeded-contents <procedure>(urlencoded-request-data-limit-exceeded-contents CONDITION) -> *</procedure> ===== urlencoded-request-data-limit-exceeded-limit <procedure>(urlencoded-request-data-limit-exceeded-limit CONDITION) -> *</procedure> ===== line-limit-exceeded-contents <procedure>(line-limit-exceeded-contents CONDITION) -> *</procedure> ===== line-limit-exceeded-limit <procedure>(line-limit-exceeded-limit CONDITION) -> *</procedure> ===== header-error-contents <procedure>(header-error-contents CONDITION) -> *</procedure> ===== header-limit-exceeded-contents <procedure>(header-limit-exceeded-contents CONDITION) -> *</procedure> ===== header-limit-exceeded-limit <procedure>(header-limit-exceeded-limit CONDITION) -> *</procedure> ===== unknown-protocol-line-line <procedure>(unknown-protocol-line-line CONDITION) -> *</procedure> ===== unknown-protocol-major <procedure>(unknown-protocol-major CONDITION) -> *</procedure> ===== unknown-protocol-minor <procedure>(unknown-protocol-minor CONDITION) -> *</procedure> ===== unknown-code-code <procedure>(unknown-code-code CONDITION) -> *</procedure> ===== unknown-status-status <procedure>(unknown-status-status CONDITION) -> *</procedure> ===== rfc1123-subparser-value? <procedure>(rfc1123-subparser-value? CONDITION) -> boolean</procedure> ===== rfc850-subparser-value? <procedure>(rfc850-subparser-value? CONDITION) -> boolean</procedure> ===== asctime-subparser-value? <procedure>(asctime-subparser-value? CONDITION) -> boolean</procedure> ===== http-date-subparser-value? <procedure>(http-date-subparser-value? CONDITION) -> boolean</procedure> ===== unencoded-header-value? <procedure>(unencoded-header-value? CONDITION) -> boolean</procedure> ===== username-with-colon-value? <procedure>(username-with-colon-value? CONDITION) -> boolean</procedure> === Condition Libraries w/ Runtime Lookup ==== Usage Example <enscript language=scheme> (import (rename (standard-conditions memo) (get standard-conditions-get))) (import (rename (intarweb-conditions memo) (get intarweb-conditions-get))) (import (rename (http-client-conditions memo) (get http-client-conditions-get))) (define unexpected-server-response-response (http-client-conditions-get 'unexpected-server-response-response) </enscript> == Bugs & Limitations * SRFI 12 accepts any object as a condition kind or property tag, even {{#f}}. This extension restricts such to {{(and (not #f) atom?)}}! == Notes * {{write-exn-condition}} is from {{write-exception}} of [[https://github.com/dleslie/geiser/blob/master/scheme/chicken/geiser/emacs.scm]]. == Author [[/users/kon-lovett|Kon Lovett]] == Repository This egg is hosted on the CHICKEN Subversion repository: [[https://anonymous@code.call-cc.org/svn/chicken-eggs/release/5/condition-utils|https://anonymous@code.call-cc.org/svn/chicken-eggs/release/5/condition-utils]] If you want to check out the source code repository of this egg and you are not familiar with Subversion, see [[/egg-svn-checkout|this page]]. == Version history ; 2.4.0 : Smaller. ; 2.3.1 : Fix condition predicate & accessor caching. ; 2.3.0 : Add {{errno}} & {{make-exn-condition*}}. ; 2.2.2 : . ; 2.2.1 : . ; 2.2.0 : Add condition library runtime lookup {{get}} API. ; 2.1.4 : . ; 2.1.3 : . ; 2.1.2 : . ; 2.1.1 : . ; 2.1.0 : CHICKEN 5 release. ; 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) 2009-2025 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. Description of your changes:

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