hy/tests/native_tests/reader_macros.hy

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(import [functools [wraps]])
(defn test-reader-macro []
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"Test a basic reader macro"
(defreader ^ [expr]
expr)
(assert (= #^"works" "works")))
(defn test-reader-macro-expr []
"Test basic exprs like lists and arrays"
(defreader n [expr]
(get expr 1))
(assert (= #n[1 2] 2))
(assert (= #n(1 2) 2)))
(defn test-reader-macro-override []
"Test if we can override function symbols"
(defreader + [n]
(+ n 1))
(assert (= #+2 3)))
(defn test-reader-macros-macros []
"Test if defreader is actually a macro"
(defreader t [expr]
`(, ~@expr))
(def a #t[1 2 3])
(assert (= (type a) tuple))
(assert (= (, 1 2 3) a)))
(defn test-reader-macro-string-name []
"Test if defreader accepts a string as a macro name."
(defreader "." [expr]
expr)
(assert (= #."works" "works")))
(defn test-builtin-decorator-reader []
(defn increment-arguments [func]
"Increments each argument passed to the decorated function."
#@((wraps func)
(defn wrapper [&rest args &kwargs kwargs]
(apply func
(map inc args)
(dict-comp k (inc v) [[k v] (.items kwargs)])))))
#@(increment-arguments
(defn foo [&rest args &kwargs kwargs]
"Bar."
(, args kwargs)))
;; The decorator did what it was supposed to
(assert (= (, (, 2 3 4) {"quux" 5 "baz" 6})
(foo 1 2 3 :quux 4 :baz 5)))
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;; @wraps preserved the docstring and __name__
(assert (= "foo" (. foo --name--)))
(assert (= "Bar." (. foo --doc--)))
;; We can use the #@ reader macro to apply more than one decorator
#@(increment-arguments
increment-arguments
(defn double-foo [&rest args &kwargs kwargs]
"Bar."
(, args kwargs)))
(assert (= (, (, 3 4 5) {"quux" 6 "baz" 7})
(double-foo 1 2 3 :quux 4 :baz 5))))