hy/tests/native_tests/native_macros.hy

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;; Copyright 2017 the authors.
;; This file is part of Hy, which is free software licensed under the Expat
;; license. See the LICENSE.
(import [hy.errors [HyTypeError]])
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(defmacro rev [&rest body]
"Execute the `body` statements in reverse"
(quasiquote (do (unquote-splice (list (reversed body))))))
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(defn test-rev-macro []
"NATIVE: test stararged native macros"
(setv x [])
(rev (.append x 1) (.append x 2) (.append x 3))
(assert (= x [3 2 1])))
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; Macros returning constants
(defmacro an-int [] 42)
(assert (= (an-int) 42))
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(defmacro a-true [] True)
(assert (= (a-true) True))
(defmacro a-false [] False)
(assert (= (a-false) False))
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(defmacro a-float [] 42.)
(assert (= (a-float) 42.))
(defmacro a-complex [] 42j)
(assert (= (a-complex) 42j))
(defmacro a-string [] "foo")
(assert (= (a-string) "foo"))
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(defmacro a-bytes [] b"foo")
(assert (= (a-bytes) b"foo"))
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(defmacro a-list [] [1 2])
(assert (= (a-list) [1 2]))
(defmacro a-tuple [&rest b] b)
(assert (= (a-tuple 1 2) [1 2]))
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(defmacro a-dict [] {1 2})
(assert (= (a-dict) {1 2}))
(defmacro a-set [] #{1 2})
(assert (= (a-set) #{1 2}))
(defmacro a-none [])
(assert (= (a-none) None))
; A macro calling a previously defined function
(eval-when-compile
(defn foo [x y]
(quasiquote (+ (unquote x) (unquote y)))))
(defmacro bar [x y]
(foo x y))
(defn test-macro-kw []
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"NATIVE: test that an error is raised when &kwonly, &kwargs, or &key is used in a macro"
(try
(eval '(defmacro f [&kwonly a b]))
(except [e HyTypeError]
(assert (= e.message "macros cannot use &kwonly")))
(else (assert False)))
(try
(eval '(defmacro f [&kwargs kw]))
(except [e HyTypeError]
(assert (= e.message "macros cannot use &kwargs")))
(else (assert False)))
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(try
(eval '(defmacro f [&key {"kw" "xyz"}]))
(except [e HyTypeError]
(assert (= e.message "macros cannot use &key")))
(else (assert False))))
(defn test-fn-calling-macro []
"NATIVE: test macro calling a plain function"
(assert (= 3 (bar 1 2))))
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(defn test-optional-and-unpacking-in-macro []
; https://github.com/hylang/hy/issues/1154
(defn f [&rest args]
(+ "f:" (repr args)))
(defmacro mac [&optional x]
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`(f #* [~x]))
(assert (= (mac) "f:(None,)")))
(defn test-midtree-yield []
"NATIVE: test yielding with a returnable"
(defn kruft [] (yield) (+ 1 1)))
(defn test-midtree-yield-in-for []
"NATIVE: test yielding in a for with a return"
(defn kruft-in-for []
(for* [i (range 5)]
(yield i))
(+ 1 2)))
(defn test-midtree-yield-in-while []
"NATIVE: test yielding in a while with a return"
(defn kruft-in-while []
(setv i 0)
(while (< i 5)
(yield i)
(setv i (+ i 1)))
(+ 2 3)))
(defn test-multi-yield []
"NATIVE: testing multiple yields"
(defn multi-yield []
(for* [i (range 3)]
(yield i))
(yield "a")
(yield "end"))
(assert (= (list (multi-yield)) [0 1 2 "a" "end"])))
; Macro that checks a variable defined at compile or load time
(setv phase "load")
(eval-when-compile
(setv phase "compile"))
(defmacro phase-when-compiling [] phase)
(assert (= phase "load"))
(assert (= (phase-when-compiling) "compile"))
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(setv initialized False)
(eval-and-compile
(setv initialized True))
(defmacro test-initialized [] initialized)
(assert initialized)
(assert (test-initialized))
(defn test-if-python2 []
(import sys)
(assert (= (get sys.version_info 0)
(if-python2 2 3))))
(defn test-gensym-in-macros []
(import ast)
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(import [astor.code-gen [to-source]])
(import [hy.importer [import_buffer_to_ast]])
(setv macro1 "(defmacro nif [expr pos zero neg]
(setv g (gensym))
`(do
(setv ~g ~expr)
(cond [(pos? ~g) ~pos]
[(zero? ~g) ~zero]
[(neg? ~g) ~neg])))
(print (nif (inc -1) 1 0 -1))
")
;; expand the macro twice, should use a different
;; gensym each time
(setv _ast1 (import_buffer_to_ast macro1 "foo"))
(setv _ast2 (import_buffer_to_ast macro1 "foo"))
(setv s1 (to_source _ast1))
(setv s2 (to_source _ast2))
;; and make sure there is something new that starts with :G_
(assert (in "_;G|" s1))
(assert (in "_;G|" s2))
;; but make sure the two don't match each other
(assert (not (= s1 s2))))
(defn test-with-gensym []
(import ast)
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(import [astor.code-gen [to-source]])
(import [hy.importer [import_buffer_to_ast]])
(setv macro1 "(defmacro nif [expr pos zero neg]
(with-gensyms [a]
`(do
(setv ~a ~expr)
(cond [(pos? ~a) ~pos]
[(zero? ~a) ~zero]
[(neg? ~a) ~neg]))))
(print (nif (inc -1) 1 0 -1))
")
;; expand the macro twice, should use a different
;; gensym each time
(setv _ast1 (import_buffer_to_ast macro1 "foo"))
(setv _ast2 (import_buffer_to_ast macro1 "foo"))
(setv s1 (to_source _ast1))
(setv s2 (to_source _ast2))
(assert (in "_;a|" s1))
(assert (in "_;a|" s2))
(assert (not (= s1 s2))))
(defn test-defmacro-g! []
(import ast)
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(import [astor.code-gen [to-source]])
(import [hy.importer [import_buffer_to_ast]])
(setv macro1 "(defmacro/g! nif [expr pos zero neg]
`(do
(setv ~g!res ~expr)
(cond [(pos? ~g!res) ~pos]
[(zero? ~g!res) ~zero]
[(neg? ~g!res) ~neg])))
(print (nif (inc -1) 1 0 -1))
")
;; expand the macro twice, should use a different
;; gensym each time
(setv _ast1 (import_buffer_to_ast macro1 "foo"))
(setv _ast2 (import_buffer_to_ast macro1 "foo"))
(setv s1 (to_source _ast1))
(setv s2 (to_source _ast2))
(assert (in "_;res|" s1))
(assert (in "_;res|" s2))
(assert (not (= s1 s2)))
;; defmacro/g! didn't like numbers initially because they
;; don't have a startswith method and blew up during expansion
(setv macro2 "(defmacro/g! two-point-zero [] `(+ (float 1) 1.0))")
(assert (import_buffer_to_ast macro2 "foo")))
(defn test-defmacro! []
;; defmacro! must do everything defmacro/g! can
(import ast)
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(import [astor.code-gen [to-source]])
(import [hy.importer [import_buffer_to_ast]])
(setv macro1 "(defmacro! nif [expr pos zero neg]
`(do
(setv ~g!res ~expr)
(cond [(pos? ~g!res) ~pos]
[(zero? ~g!res) ~zero]
[(neg? ~g!res) ~neg])))
(print (nif (inc -1) 1 0 -1))
")
;; expand the macro twice, should use a different
;; gensym each time
(setv _ast1 (import_buffer_to_ast macro1 "foo"))
(setv _ast2 (import_buffer_to_ast macro1 "foo"))
(setv s1 (to_source _ast1))
(setv s2 (to_source _ast2))
(assert (in "_;res|" s1))
(assert (in "_;res|" s2))
(assert (not (= s1 s2)))
;; defmacro/g! didn't like numbers initially because they
;; don't have a startswith method and blew up during expansion
(setv macro2 "(defmacro! two-point-zero [] `(+ (float 1) 1.0))")
(assert (import_buffer_to_ast macro2 "foo"))
(defmacro! foo! [o!foo] `(do ~g!foo ~g!foo))
;; test that o! becomes g!
(assert (= "Hy" (foo! "Hy")))
;; test that o! is evaluated once only
(setv foo 40)
(foo! (+= foo 1))
(assert (= 41 foo)))
(defn test-if-not []
(assert (= (if-not True :yes :no)
:no))
(assert (= (if-not False :yes :no)
:yes))
(assert (none? (if-not True :yes)))
(assert (= (if-not False :yes)
:yes)))
(defn test-lif []
"test that lif works as expected"
;; None is false
(assert (= (lif None "true" "false") "false"))
;; But everything else is True! Even falsey things.
(assert (= (lif True "true" "false") "true"))
(assert (= (lif False "true" "false") "true"))
(assert (= (lif 0 "true" "false") "true"))
(assert (= (lif "some-string" "true" "false") "true"))
(assert (= (lif "" "true" "false") "true"))
(assert (= (lif (+ 1 2 3) "true" "false") "true"))
(assert (= (lif None "true" "false") "false"))
(assert (= (lif 0 "true" "false") "true"))
;; Test ellif [sic]
(assert (= (lif None 0
None 1
0 2
3)
2)))
(defn test-lif-not []
"test that lif-not works as expected"
; None is false
(assert (= (lif-not None "false" "true") "false"))
; But everything else is True! Even falsey things.
(assert (= (lif-not True "false" "true") "true"))
(assert (= (lif-not False "false" "true") "true"))
(assert (= (lif-not 0 "false" "true") "true"))
(assert (= (lif-not "some-string" "false" "true") "true"))
(assert (= (lif-not "" "false" "true") "true"))
(assert (= (lif-not (+ 1 2 3) "false" "true") "true"))
(assert (= (lif-not None "false" "true") "false"))
(assert (= (lif-not 0 "false" "true") "true")))
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(defn test-defmain []
"NATIVE: make sure defmain is clean"
(global --name--)
(setv oldname --name--)
(setv --name-- "__main__")
(defn main []
(print 'Hy)
42)
(try
(defmain [&rest args]
(main))
(except [e SystemExit]
(assert (= (str e) "42"))))
(setv --name-- oldname))