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Provides a Dictionary abstraction.
- Version history
Purports to be a simple key -> value lookup table. Known as a 'Dictionary' in some circles. It attempts to optimize for speed of lookup by choosing different storage models.
Four variants of the API are available:
- Perfroms argument and other constraint checks.
- Performs no constraint checks.
- safe synchronized
- Suffixes each procedure name with "/synch". All access to the dict object is synchronized.
- unsafe synchronized
- Suffixes each procedure name with "/%synch", except constructors & predicates which use "/synch".
- dict? is the name of the safe & unsafe variant's predicate, while dict?/synch is the safe synchronized and unsafe synchronized variant's name.
- dict-count is the name of the safe & unsafe variant's operation, while dict-count/synch is the safe synchronized name and dict-count/%synch the unsafe synchronized name.
make-dict[procedure] (make-dict [EQUALITY eq? [ESTIMATE <small-number>]]) -> dict
Returns a dictionary using the supplied EQUALITY test, optimized for the number of elements ESTIMATE.
alist->dict[procedure] (alist->dict ALIST [EQUALITY eq?] [ESTIMATE 0]) -> dict
Returns a dictionary constructed from ALIST using the supplied EQUALITY test, and optional ESTIMATE.
dict?[procedure] (dict? OBJECT) -> boolean
Is the OBJECT a dictionary?
dict-equivalence-function[procedure] (dict-equivalence-function DICT) -> (procedure (object object) boolean)
Returns the equality test predicate procedure for DICT.
dict-count[procedure] (dict-count DICT) -> integer
Returns the number of items in the DICT.
dict-keys[procedure] (dict-keys DICT) -> list
Returns the keys in the DICT.
dict-values[procedure] (dict-values DICT) -> list
Returns the values in the DICT.
dict->alist[procedure] (dict->alist DICT) => list
Returns the DICT as an association list. The result may not be mutated!
dict-ref[procedure] (dict-ref DICT KEY [DEFAULT #f]) => *
Returns the value associated with KEY in the DICT, otherwise DEFAULT.
dict-Idempotent-ref![procedure] (dict-Idempotent-ref! DICT KEY FUNC [DEFAULT #f]) => *
Should a value for KEY exist in DICT it is returned. Otherwise FUNC is invoked on DEFAULT. Any result other than DEFAULT is the value for the KEY and that value is returned. Otherwise returns DEFAULT.
dict-exists?[procedure] (dict-exists? DICT KEY) => boolean
Does an entry with KEY exist in the DICT ?
dict-set![procedure] (dict-set! DICT KEY VALUE)
Associate VALUE with KEY in the DICT.
VALUE must not be (void)!
dict-update![procedure] (dict-update! DICT KEY DEFAULT-VALUE-PROCEDURE [FUNC identity])
Invokes FUNC on either the existing value for KEY in the DICT, or the result of the DEFAULT-VALUE-PROCEDURE when no existing value. The result then becomes the value for KEY in the DICT.
Returns the updated value for KEY in the DICT.
DEFAULT-VALUE-PROCEDURE must not return (void)!
dict-update-list![procedure] (dict-update-list! DICT KEY [OBJECT]...)
Updates the value for KEY in the DICT with a list of OBJECT.
dict-update-dict![procedure] (dict-update-dict! DICT KEY [EQUALITY eq? [ESTIMATE <small-number>]])
Updates the value for KEY in the DICT with a dictionay.
EQUALITY and ESTIMATE as for make-dict.
dict-delete![procedure] (dict-delete! DICT KEY)
Removes any association of KEY in the DICT.
dict-for-each[procedure] (dict-for-each DICT (PROCEDURE (-> KEY VALUE <ignored>)))
Invokes the supplied PROCEDURE with each association in the DICT.
dict-merge![procedure] (dict-merge! DICT [DICT1...]) => dict
Returns the DICT as the (union DICT DICT1 ...) using overwrite semantics.
Tables must have the same equality predicate.
dict-search[procedure] (dict-search DICT PROCEDURE [DEFAULT #f]) => *
Returns the first entry value matched by the PROCEDURE. Otherwise the DEFAULT value is returned.)
PROCEDURE is a (procedure (object object) boolean) where the first argument is the key and the second is the value.
dict-print[procedure] (dict-print DICT [PORT (current-output-port)])
Pretty-print DICT to PORT.
- Safe variant
- Synchronized safe variant
- Unsafe variant
- Synchronized unsafe variant
- Uses record-variants.
- Added 'make-dict' parameters to 'dict-update-dict!'.
- Added 'dict-Idempotent-ref!' and 'synch' versions.
- Split into safe & unsafe
- Fix for strange compile output (C procedures being redefined).
- Use of primitives.
- Chicken 4 release.
Copyright (C) 2009 Kon Lovett. All rights reserved.
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