application/octet-stream
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3.35 KB
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129 lines
; Nujel - Copyright (C) 2020-2021 - Benjamin Vincent Schulenburg
; This project uses the MIT license, a copy should be included under /LICENSE
;; Some predica tes that were simpler to do in nujel
[defun numeric? [a]
"Return #t if a is a number"
[or [int? a] [float? a] [vec? a]]]
[defun last? [a]
"Return #t if a is the last pair in a list"
[nil? [cdr a]]]
[defun pos? [a]
"Return #t if a is positive"
[and [numeric? a] [>= [float a] 0.0]]]
[defun zero-neg? [a]
"Return #t if a is zero or negative"
[and [numeric? a] [<= [float a] 0.0]]]
[defun neg? [a]
"Returns #t if a is negative"
[and [numeric? a] [< [float a] 0.0]]]
[defun odd? [a]
"Predicate that returns #t if a is odd"
[== [% [int a] 2] 1]]
[defun even? [a]
"Predicate that returns #t if a is even"
[== [mod/int [int a] 2] 0]]
[defun zero? [val]
"#t if VAL is zero"
[== 0 val]]
[defun not-zero? [val]
"#t if VAL is not zero"
[!= 0 val]]
[defun list-equal? [a b]
"#t if A and B are equal"
[when [== [type-of a] [type-of b]]
[if [pair? a]
[and [list-equal? [car a] [car b]]
[list-equal? [cdr a] [cdr b]]]
[== a b]]]]
[defun there-exists? [l pred]
"Applies predicate to each element and return #t if it holds true for any element, otherwise #f"
[cond [[nil? l] #f]
[[pred [car l]] #t]
[#t [there-exists? [cdr l] pred]]]]
[defun for-all? [l pred]
"Applies predicate to each element returns #t if it holds true for every element, otherwise #f"
[cond [[nil? l] #t]
[[not [pred [car l]]] #f]
[#t [for-all? [cdr l] pred]]]]
[defun int? [val]
"#t if VAL is a integer"
[== :int [type-of val]]]
[defun float? [val]
"#t if VAL is a floating-point number"
[== :float [type-of val]]]
[defun vec? [val]
"#t if VAL is a vector"
[== :vec [type-of val]]]
[defun bool? [val]
"#t if VAL is a boolean"
[== :bool [type-of val]]]
[defun pair? [val]
"#t if VAL is a pair"
[== :pair [type-of val]]]
[defun arr? [val]
"#t if VAL is an array"
[== :array [type-of val]]]
[defun string? [val]
"#t if VAL is a string"
[== :string [type-of val]]]
[defun symbol? [val]
"#t if VAL is a symbol"
[== :symbol [type-of val]]]
[defun object? [val]
"#t if VAL is an object"
[== :object [type-of val]]]
[defun tree? [val]
"#t if VAL is an object"
[== :tree [type-of val]]]
[defun macro? [val]
"#t if VAL is an object"
[== :macro [type-of val]]]
[defun lambda? [val]
"#t if VAL is a lambda"
[or [== :lambda [type-of val]] [== :dynamic [type-of val]]]]
[defun native? [val]
"#t if VAL is a native function"
[== :native-function [type-of val]]]
[defun special-form? [val]
"#t if VAL is a native function"
[== :special-form [type-of val]]]
[defun procedure? [val]
"#t if VAL is a native or lisp function"
[or [lambda? val] [native? val]]]
[defun bytecode-array? [v]
[== :bytecode-array [type-of v]]]
[defun bytecode-op? [v]
[== :bytecode-op [type-of v]]]
[defun in-range? [v min max]
[and [>= v min] [<= v max]]]
