184 lines
5 KiB
Racket
184 lines
5 KiB
Racket
#lang scribble/manual
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@(require scribble/example racket/sandbox
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(for-label racket graph "../utils.rkt"
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(only-in typed/racket/base
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Any AnyValues Listof String Sexp Number
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cast)))
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@title[#:tag "utils"]{dds/utils: Various Utilities}
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@defmodule[dds/utils]
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This module defines miscellaneous utilities, supporting the other modules of
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the package: evaluating sexps, manipulating lists,
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@hyperlink["https://orgmode.org/"]{Org-mode} interoperability, etc.
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@(define utils-evaluator
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(parameterize ([sandbox-output 'string]
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[sandbox-error-output 'string]
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[sandbox-memory-limit 50])
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(make-evaluator 'typed/racket/base #:requires '("utils.rkt"))))
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@section{Base Types}
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@defidform[Variable]{
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Any Racket symbol. Designates a variable in a discrete dynamical network.
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}
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@defform[(VariableMapping A)]{
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An immutable mapping (a hash table) assigning elements of type @racket[A] to
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the variables.
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}
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@section{Hashtable injection}
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This section defines some utilities to streamline the usage of hash tables
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mapping symbols to values. The goal is essentially to avoid having to write
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explicit @racket[hash-ref] calls.
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@defproc[(eval-with [ht (VariableMapping Any)] [expr Any]) AnyValues]{
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Temporarily injects the mappings from the given hash table as bindings in
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a namespace including @racket[racket/base] and then evaluates the expression.
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@examples[#:eval utils-evaluator
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(let ([ht (hash 'a 1 'b 1)])
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(eval-with ht '(+ b a 1)))
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]
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The local bindings from the current lexical scope are not
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conserved. Therefore, the following outputs an error about a
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missing identifier:
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@examples[#:eval utils-evaluator
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(eval:error
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(let ([ht (hash 'a 1 'b 1)]
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[z 1])
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(eval-with ht '(+ b z a 1)))
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)]}
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@defproc[(eval1-with [ht (VariableMapping Any)] [expr Any]) Any]{
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Like @racket[eval-with], but returns only the first value computed by
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@racket[expr].
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@examples[#:eval utils-evaluator
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(let ([ht (hash 'a 1 'b 1)])
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(eval1-with ht '(+ b a 1)))
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]}
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@defform[(auto-hash-ref/explicit stx)
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#:contracts ([stx (VariableMapping A)])]{
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Given a @racket[VariableMapping] and a sequence of symbols, binds these symbols
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to the values they are associated with in the hash table, then puts the body in
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the context of these bindings.
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@examples[#:eval utils-evaluator
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(let ([ht #hash((a . 1) (b . 2))])
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(auto-hash-ref/explicit (ht a b) (+ a (* 2 b))))
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]
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Note that only one expression can be supplied in the body.
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}
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@defform[(auto-hash-ref/: stx)
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#:contracts ([stx (VariableMapping A)])]{
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Given an expression and a @racket[VariableMapping], looks up the symbols with
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a leading semicolon and binds them to the value they are associated with in the
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hash table.
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@examples[#:eval utils-evaluator
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(let ([ht #hash((a . 1) (b . 2))])
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(auto-hash-ref/: ht (+ :a (* 2 :b))))
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]
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Thus the symbol @racket[:a] is matched to the key @racket['a] in the
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hash table.
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Note that only one expression can be supplied in the body.
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}
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@section{Analysis of quoted expressions}
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@defproc[(extract-symbols [form Any]) (Listof Symbol)]{
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Produces a list of symbols appearing in the quoted expression
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passed in the first argument.
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@examples[#:eval utils-evaluator
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(extract-symbols '(1 (2 3) x (y z 3)))
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]
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}
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@section{Org-mode interoperability}
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Org-mode supports laying out the output of code blocks as tables, which is very
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practical for various variable mappings (e.g., states). However, when the hash
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table maps variables to lists, Org-mode will create a column per list element,
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which may or may not be the desired effect. This section defines some
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utilities for nicer interoperation with Org-mode tables. It also defines some
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shortcuts to reduce the number of words to type when using dds with Org-mode.
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See
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@hyperlink["https://git.marvid.fr/scolobb/dds/src/branch/master/example/example.org"]{example.org}
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for examples of usage.
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@defproc[(any->string [x Any]) String]{
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Converts any value to string by calling @racket[display] on it and capturing
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the result in a string.
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@examples[#:eval utils-evaluator
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(any->string '(a 1 (x y)))
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]}
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@defproc[(stringify-variable-mapping [ht (VariableMapping Any)]) (VariableMapping String)]{
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Converts all the values of a @racket[VariableMapping] to string.
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@examples[#:eval utils-evaluator
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(stringify-variable-mapping (hash 'a '(and a b) 'b '(not b)))
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]}
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@defproc[(string->any [str String]) Any]{
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Reads any value from string.
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@examples[#:eval utils-evaluator
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(string->any "(or b (not a))")
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]}
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@defproc[(map-sexp [func (-> Any Any)] [sexp Any]) Any]{
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Given a @racket[Sexp], applies the @racket[func] to any object which is not
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a list.
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@racket[map-sexp] will not check whether @racket[func] is indeed applicable to
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every non-list element of @racket[sexp]. If this is not the case, a contract
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violation for func will be generated.
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@examples[#:eval utils-evaluator
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(map-sexp (λ (x) (add1 (cast x Number))) '(1 2 (4 10) 3))
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]}
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@section{Additional graph utilities}
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@section{Pretty printing}
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@section{Additional list and hash map utilities}
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@section{Functions and procedures}
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@section{Randomness}
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@section{Additional stream utilities}
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@section{Boolean operations}
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