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check-errors

Argument checks & errors.

Documentation

Argument Conventions

LOC is a symbol, or #f. The symbolic naming of the location detecting the problem. As in the error form.

OBJ is any Scheme object.

ARGNAM is a string or symbol naming the argument list element corresponding to the OBJ. The default is the type-name.

Type Checks

Performs the minimal constraint check and raises an error condition upon failure. The mimimal constraint proviso is important for understanding the behavior of the checking routines. Unless otherwise specified no additional constraints are verified.

So the check-...-interval routines, for example, do not verify the types of the arguments, only the interval constraint.

When the unsafe feature is defined the check procedures are no-ops.

Note that the full-numeric-tower is not supported.

All check-... routines return the checked object; unless a type-error exception is raised, obviously.

Usage

(import type-checks)

check-defined-value

[procedure] (check-defined-value LOC OBJ [ARGNAM]) -> *

Ensures the OBJ is non-void, i.e. not an undefined-value.

check-bound-value

[procedure] (check-bound-value LOC OBJ [ARGNAM]) -> *

Ensures the OBJ is the value of a bound variable.

Only for use in rather unsafe calling environments where some explicit checking is necessary.

check-fixnum

check-positive-fixnum

check-natural-fixnum

check-negative-fixnum

check-non-positive-fixnum

[procedure] (check-fixnum LOC OBJ [ARGNAM]) --> fixnum
[procedure] (check-positive-fixnum LOC OBJ [ARGNAM]) --> fixnum
[procedure] (check-natural-fixnum LOC OBJ [ARGNAM]) --> fixnum
[procedure] (check-negative-fixnum LOC OBJ [ARGNAM]) --> fixnum
[procedure] (check-non-positive-fixnum LOC OBJ [ARGNAM]) --> fixnum

check-integer

check-positive-integer

check-natural-integer

check-negative-integer

check-non-positive-integer

[procedure] (check-integer LOC OBJ [ARGNAM]) --> integer
[procedure] (check-positive-integer LOC OBJ [ARGNAM]) --> integer
[procedure] (check-natural-integer LOC OBJ [ARGNAM]) --> integer
[procedure] (check-negative-integer LOC OBJ [ARGNAM]) --> integer
[procedure] (check-non-positive-integer LOC OBJ [ARGNAM]) --> integer

check-number

check-positive-number

check-natural-number

check-negative-number

check-non-positive-number

[procedure] (check-number LOC OBJ [ARGNAM]) --> number
[procedure] (check-positive-number LOC OBJ [ARGNAM]) --> number
[procedure] (check-natural-number LOC OBJ [ARGNAM]) --> number
[procedure] (check-negative-number LOC OBJ [ARGNAM]) --> number
[procedure] (check-non-positive-number LOC OBJ [ARGNAM]) --> number

check-flonum

[procedure] (check-flonum LOC OBJ [ARGNAM]) -> flonum

check-procedure

[procedure] (check-procedure LOC OBJ [ARGNAM]) -> *

check-input-port

[procedure] (check-input-port LOC OBJ [ARGNAM]) -> *

check-output-port

[procedure] (check-output-port LOC OBJ [ARGNAM]) -> *

check-list

[procedure] (check-list LOC OBJ [ARGNAM]) -> *

check-pair

[procedure] (check-pair LOC OBJ [ARGNAM]) -> *

check-blob

[procedure] (check-blob LOC OBJ [ARGNAM]) -> *

check-vector

[procedure] (check-vector LOC OBJ [ARGNAM]) -> *

check-structure

[procedure] (check-structure LOC OBJ TAG [ARGNAM]) -> *
[procedure] (check-record LOC OBJ TAG [ARGNAM]) -> *
[procedure] (check-record-type LOC OBJ TAG [ARGNAM]) -> *

check-record and check-record-type are essentially synonyms.

check-symbol

[procedure] (check-symbol LOC OBJ [ARGNAM]) -> *

check-keyword

[procedure] (check-keyword LOC OBJ [ARGNAM]) -> *

check-string

[procedure] (check-string LOC OBJ [ARGNAM]) -> *

check-char

[procedure] (check-char LOC OBJ [ARGNAM]) -> *

check-boolean

[procedure] (check-boolean LOC OBJ [ARGNAM]) -> *

check-alist

[procedure] (check-alist LOC OBJ [ARGNAM]) -> *

check-minimum-argument-count

[procedure] (check-minimum-argument-count LOC ARGC MINARGC) -> *

Does not verify the type of ARGC, and MINARGC.

check-argument-count

[procedure] (check-argument-count LOC ARGC MAXARGC) -> *

Does not verify the type of ARGC, and MAXARGC.

check-open-interval

[procedure] (check-open-interval LOC NUM MINNUM MAXNUM [ARGNAM]) -> *

NUM in ]MINNUM MAXNUM[.

Does not verify the type of NUM, MINNUM, and MAXNUM.

check-closed-interval

[procedure] (check-closed-interval LOC NUM MINNUM MAXNUM [ARGNAM]) -> *

NUM in [MINNUM MAXNUM].

Does not verify the type of NUM, MINNUM, and MAXNUM.

check-half-open-interval

[procedure] (check-half-open-interval LOC NUM MINNUM MAXNUM [ARGNAM]) -> *

NUM in ]MINNUM MAXNUM].

Does not verify the type of NUM, MINNUM, and MAXNUM.

check-half-closed-interval

[procedure] (check-half-closed-interval LOC NUM MINNUM MAXNUM [ARGNAM]) -> *

NUM in [MINNUM MAXNUM[.

Does not verify the type of NUM, MINNUM, and MAXNUM.

check-range

[procedure] (check-range LOC START END [ARGNAM]) -> number number

Verify (<= START END) & return (values START END).

Does not verify the type of START and END, but assumes (or fixnum flonum).

define-check-type

[syntax] (define-check-type TYPNAM [TYPE-PRED])

Creates a procedure definition for check-TYPNAM with the signature of the above check procedures. The type-predicate is either TYPE-PRED, when present, or TYPNAM?.

TYPNAM is an unquoted symbol.

(define-check-type hash-table)
;=>
;(define (check-hash-table loc obj #!optional argnam)
;  (unless (hash-table? obj)
;    (error-hash-table loc obj argnam))
;  obj )

define-check+error-type

[syntax] (define-check+error-type TYPNAM [TYPE-PRED [TYPMSG]])

Creates a procedure definition for check-TYPNAM with the signature of the above check procedures. The type-predicate is either TYPE-PRED, when present, or TYPE?. The error message type-name is either the TYPMSG, when present, or "TYPNAM"".

TYPNAM is an unquoted symbol.

(define-check+error-type hash-table)
;=>
;(define-error-type loc obj 'hash-table)
;(define (check-hash-table loc obj #!optional argnam)
;  (unless (hash-table? obj)
;    (error-hash-table loc obj argnam))
;  obj )

Type Errors

Argument Conventions

TYPNAM is a symbol or string, unless otherwise indicated.

ARGNAM is a symbol, string, or #f. Default is #f.

Usage

(import type-errors)

make-bad-argument-message

[procedure] (make-bad-argument-message [ARGNAM]) -> string

Returns an argument type error message for the, optional, ARGNAM.

Example:

(make-bad-argument-message "count")
;=> "bad `count' argument"
(make-bad-argument-message)
;=> "bad argument"

make-type-name-message

[procedure] (make-type-name-message TYPNAM) -> string

Returns an argument type message for the TYPNAM by supplying an article.

Example:

(make-type-name-message integer) ;=> an integer"
(make-type-name-message "symbol in {foo bar baz}")
;=> "a symbol in {foo bar baz}"

make-error-type-message

[procedure] (make-error-type-message TYPNAM [ARGNAM]) -> string

Returns a type error message from the TYPNAM and optional ARGNAM.

Uses make-bad-argument-message and make-type-name-message to build the message components.

Example:

(make-error-type-message 'integer "count")
;=> "bad `count' argument type - not an integer"

signal-bounds-error

[procedure] (signal-bounds-error LOC MSG OBJ...)

Raises a non-continuable type error - (({exn bounds)}}.

signal-type-error

[procedure] (signal-type-error LOC MSG OBJ...)

Raises a non-continuable type error - (({exn type)}}.

error-argument-type

[procedure] (error-argument-type LOC OBJ TYPNAM [ARGNAM])

Raises a type-error where is message is constructed from the TYPNAM and ARGNAM.

Uses signal-type-error and make-error-type-message.

warning-argument-type

[procedure] (warning-argument-type LOC OBJ TYPNAM [ARGNAM])

A warning is issued with a message similar to that of error-argument-type.

error-defined-value

[procedure] (error-defined-value LOC OBJ [ARGNAM])

error-bound-value

[procedure] (error-bound-value LOC OBJ [ARGNAM])

error-fixnum

error-positive-fixnum

error-natural-fixnum

error-negative-fixnum

error-non-positive-fixnum

[procedure] (error-fixnum LOC OBJ [ARGNAM])
[procedure] (error-positive-fixnum LOC OBJ [ARGNAM])
[procedure] (error-natural-fixnum LOC OBJ [ARGNAM])
[procedure] (error-negative-fixnum LOC OBJ [ARGNAM])
[procedure] (error-non-positive-fixnum LOC OBJ [ARGNAM])

error-integer

error-positive-integer

error-natural-integer

error-negative-integer

error-non-positive-integer

[procedure] (error-integer LOC OBJ [ARGNAM])
[procedure] (error-positive-integer LOC OBJ [ARGNAM])
[procedure] (error-natural-integer LOC OBJ [ARGNAM])
[procedure] (error-negative-integer LOC OBJ [ARGNAM])
[procedure] (error-non-positive-integer LOC OBJ [ARGNAM])

error-number

error-positive-number

error-natural-number

error-negative-number

error-non-positive-number

[procedure] (error-number LOC OBJ [ARGNAM])
[procedure] (error-positive-number LOC OBJ [ARGNAM])
[procedure] (error-natural-number LOC OBJ [ARGNAM])
[procedure] (error-negative-number LOC OBJ [ARGNAM])
[procedure] (error-non-positive-number LOC OBJ [ARGNAM])

error-flonum

[procedure] (error-flonum LOC OBJ [ARGNAM])

error-procedure

[procedure] (error-procedure LOC OBJ [ARGNAM])

error-input-port

[procedure] (error-input-port LOC OBJ [ARGNAM])

error-output-port

[procedure] (error-output-port LOC OBJ [ARGNAM])

error-list

[procedure] (error-list LOC OBJ [ARGNAM])

error-pair

[procedure] (error-pair LOC OBJ [ARGNAM])

error-blob

[procedure] (error-blob LOC OBJ [ARGNAM])

error-vector

[procedure] (error-vector LOC OBJ [ARGNAM])

error-structure

[procedure] (error-structure LOC OBJ TAG [ARGNAM])

error-record and error-record-type are essentially synonyms.

error-symbol

[procedure] (error-symbol LOC OBJ [ARGNAM])

error-keyword

[procedure] (error-keyword LOC OBJ [ARGNAM])

error-string

[procedure] (error-string LOC OBJ [ARGNAM])

error-char

[procedure] (error-char LOC OBJ [ARGNAM])

error-boolean

[procedure] (error-boolean LOC OBJ [ARGNAM])

error-alist

[procedure] (error-alist LOC OBJ [ARGNAM])

error-minimum-argument-count

[procedure] (error-minimum-argument-count LOC ARGC MINARGC)

error-argument-count

[procedure] (error-argument-count LOC ARGC MAXARGC)

error-open-interval

[procedure] (error-open-interval LOC NUM MINNUM MAXNUM [ARGNAM])

error-closed-interval

[procedure] (error-closed-interval LOC NUM MINNUM MAXNUM [ARGNAM])

error-half-open-interval

[procedure] (error-half-open-interval LOC NUM MINNUM MAXNUM [ARGNAM])

error-half-closed-interval

[procedure] (error-half-closed-interval LOC NUM MINNUM MAXNUM [ARGNAM])

error-range

[procedure] (error-range LOC START END [ARGNAM])

error-interval

[procedure] (error-interval LOC NUM LEFT MINNUM MAXNUM RIGHT [ARGNAM])

LEFT is a character, symbol, or string that denotes the symbolic opening of an interval.

RIGHT is a character, symbol, or string that denotes the symbolic closing of an interval.

define-error-type

[syntax] (define-error-type TYPNAM [TYPMSG])

TYPNAM is a symbol.

TYPMSG is a symbol or string.

Creates a procedure definition for error-TYPNAM with the signature of the above error procedures. The type-name is either TYPMSG, when present, or "TYPNAM".

(define-error-type hash-table)
;=>
;(define (error-hash-table loc obj #!optional argnam)
;  (error-argument-type loc obj "hash-table" argnam) )

(define-error-type byte-order "symbol in {big-endian little-endian}")
;=>
;(define (error-byte-order loc obj #!optional argnam)
;  (error-argument-type loc obj "symbol in {big-endian little-endian}" argnam) )

SRFI 4 Checks

Usage

(import srfi-4-checks)

check-s8vector

[procedure] (check-s8vector LOC OBJ [ARGNAM]) -> *

check-u8vector

[procedure] (check-u8vector LOC OBJ [ARGNAM]) -> *

check-s16vector

[procedure] (check-s16vector LOC OBJ [ARGNAM]) -> *

check-u16vector

[procedure] (check-u16vector LOC OBJ [ARGNAM]) -> *

check-s32vector

[procedure] (check-s32vector LOC OBJ [ARGNAM]) -> *

check-u32vector

[procedure] (check-u32vector LOC OBJ [ARGNAM]) -> *

check-s64vector

[procedure] (check-s64vector LOC OBJ [ARGNAM]) -> *

check-u64vector

[procedure] (check-u64vector LOC OBJ [ARGNAM]) -> *

check-f32vector

[procedure] (check-f32vector LOC OBJ [ARGNAM]) -> *

check-f64vector

[procedure] (check-f64vector LOC OBJ [ARGNAM]) -> *

SRFI 4 Errors

Usage

(import srfi-4-errors)

error-s8vector

[procedure] (error-s8vector LOC OBJ [ARGNAM])

error-u8vector

[procedure] (error-u8vector LOC OBJ [ARGNAM])

error-s16vector

[procedure] (error-s16vector LOC OBJ [ARGNAM])

error-u16vector

[procedure] (error-u16vector LOC OBJ [ARGNAM])

error-s32vector

[procedure] (error-s32vector LOC OBJ [ARGNAM])

error-u32vector

[procedure] (error-u32vector LOC OBJ [ARGNAM])

error-s64vector

[procedure] (error-s64vector LOC OBJ [ARGNAM])

error-u64vector

[procedure] (error-u64vector LOC OBJ [ARGNAM])

error-f32vector

[procedure] (error-f32vector LOC OBJ [ARGNAM])

error-f64vector

[procedure] (error-f64vector LOC OBJ [ARGNAM])

Bugs & Limitations

• The make-*-message functions are English only.
• No bignum, cplxnum, or ratnum checks/errors.

Author

Kon Lovett

Version history

3.0.0 ; CHICKEN 5 release.

2.2.0 ; Fix check-range return.

2.1.0 ; Add check-range, error-range, signal-bounds-error.

2.0.1 ; Fix interval boundary symbols.

2.0.0 ; Removed copy of inline-type-checks.scm to (chicken-home). Ticket #1327

1.13.0 ; Added egg module.

1.12.6 ; inline-type-checks.scm copied to Chicken Repository. Produces shared+static object files.

1.12.5 ; define-inline-check-type generates name with "%" prefix.

1.12.4 ; Moved optional argument name checks until after error detected.

1.12.3 ; Fix for error-minimum-argument-coun and error-argument-count.

1.12.2 ; Better no-install support.

1.12.1 ; Deprecated ...-cardinal-... in favor of ...-natural-....

1.12.0 ; Removed error-utils & conditions.

1.11.0 ; Added error-utils.

1.10.0 ; The check-... routines return the checked value.

1.8.0

Added srfi-4 support.

1.7.0

1.6.0

Added interval support.

1.5.0

Added alist and argument count support.

1.4.0

1.3.0

Added warning-argument-type.

1.2.0

Added make-error-type-message & fixed define-check+error-type.

1.1.0

Added make-condition+, condition-property-accessor* and make-condition-property-accessor.

1.0.0

Initial release.

License

Copyright (C) 2009-2018 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.