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Rewrite the bootstrap macros in hy

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This gets rid of the dichotomy between bootstrap.py and macros.hy,
by making both files hy modules.

I added some error checking to make the macros more resilient. The
biggest (user-visible) change is the change in cond, which now only
accepts lists as arguments. Tests updated accordingly.

Closes: #176 (whoops, no more bootstrap)
This commit is contained in:
Nicolas Dandrimont 2013-09-29 18:00:24 +02:00
parent d5bf328aa7
commit 875d5f2ff5
5 changed files with 196 additions and 172 deletions
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74
hy/core/bootstrap.hy Normal file
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@ -0,0 +1,74 @@
;;; Hy bootstrap macros
;;
;; Copyright (c) 2013 Nicolas Dandrimont <nicolas.dandrimont@crans.org>
;; Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
;; Copyright (c) 2013 Konrad Hinsen <konrad.hinsen@fastmail.net>
;;
;; Permission is hereby granted, free of charge, to any person obtaining a
;; copy of this software and associated documentation files (the "Software"),
;; to deal in the Software without restriction, including without limitation
;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
;; and/or sell copies of the Software, and to permit persons to whom the
;; Software is furnished to do so, subject to the following conditions:
;;
;; The above copyright notice and this permission notice shall be included in
;; all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
;; DEALINGS IN THE SOFTWARE.
;;
;;; These macros are the essential hy macros.
;;; They are automatically required everywhere, even inside hy.core modules.
(import [hy.compiler [HyTypeError]])
(defmacro macro-error [location reason]
"error out properly within a macro"
`(raise (HyTypeError ~location ~reason)))
(defmacro defmacro-alias [names lambda-list &rest body]
"define one macro with several names"
(setv ret `(do))
(foreach [name names]
(.append ret
`(defmacro ~name ~lambda-list ~@body)))
ret)
(defmacro-alias [defn defun] [name lambda-list &rest body]
"define a function `name` with signature `lambda-list` and body `body`"
(if (not (= (type name) HySymbol))
(macro-error name "defn/defun takes a name as first argument"))
`(setv ~name (fn ~lambda-list ~@body)))
(defmacro let [variables &rest body]
"Execute `body` in the lexical context of `variables`"
(setv macroed_variables [])
(if (not (isinstance variables HyList))
(macro-error variables "let lexical context must be a list"))
(foreach [variable variables]
(if (isinstance variable HyList)
(do
(if (!= (len variable) 2)
(macro-error variable "let variable assignments must contain two items"))
(.append macroed-variables `(setv ~(get variable 0) ~(get variable 1))))
(.append macroed-variables `(setv ~variable None))))
`((fn []
~@macroed-variables
~@body)))
(defmacro if-python2 [python2-form python3-form]
"If running on python2, execute python2-form, else, execute python3-form"
(import sys)
(if (< (get sys.version_info 0) 3)
python2-form
python3-form))

156
hy/core/bootstrap.py
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@ -1,156 +0,0 @@
# Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
from hy.macros import macro
from hy.models.expression import HyExpression
from hy.models.integer import HyInteger
from hy.models.symbol import HySymbol
from hy.models.list import HyList
@macro("defn")
@macro("defun")
def defn_macro(name, *body):
return HyExpression([HySymbol("def"),
name, HyExpression([HySymbol("fn")] + list(body))])
@macro("cond")
def cond_macro(*tree):
it = iter(tree)
test, branch = next(it)
root = HyExpression([HySymbol("if"), test, branch])
ret = root
for (test, branch) in it:
n = HyExpression([HySymbol("if"), test, branch])
ret.append(n)
ret = n
return root
@macro("for")
def for_macro(*tree):
ret = None
# for [x iter y iter] ...
# ->
# foreach x iter
# foreach y iter
# ...
tree = HyExpression(tree).replace(tree[0])
it = iter(tree.pop(0))
blocks = list(zip(it, it)) # List for Python 3.x degenerating.
key, val = blocks.pop(0)
ret = HyExpression([HySymbol("foreach"),
HyList([key, val])])
root = ret
ret.replace(tree)
for key, val in blocks:
# x, [1, 2, 3, 4]
nret = HyExpression([HySymbol("foreach"),
HyList([key, val])])
nret.replace(key)
ret.append(nret)
ret = nret
[ret.append(x) for x in tree] # we really need ~@
return root
@macro("_>")
def threading_macro(head, *rest):
ret = head
for node in rest:
if not isinstance(node, HyExpression):
nnode = HyExpression([node])
nnode.replace(node)
node = nnode
node.insert(1, ret)
ret = node
return ret
@macro("_>>")
def threading_tail_macro(head, *rest):
ret = head
for node in rest:
if not isinstance(node, HyExpression):
nnode = HyExpression([node])
nnode.replace(node)
node = nnode
node.append(ret)
ret = node
return ret
@macro("car")
@macro("first")
def first_macro(lst):
return HyExpression([HySymbol('get'),
lst,
HyInteger(0)])
@macro("cdr")
@macro("rest")
def rest_macro(lst):
return HyExpression([HySymbol('slice'),
lst,
HyInteger(1)])
@macro("let")
def let_macro(variables, *body):
expr = HyExpression([HySymbol("fn"), HyList([])])
for var in variables:
if isinstance(var, list):
expr.append(HyExpression([HySymbol("setv"),
var[0], var[1]]))
else:
expr.append(HyExpression([HySymbol("setv"),
var, HySymbol("None")]))
return HyExpression([expr + list(body)])
@macro("when")
def when_macro(test, *body):
return HyExpression([
HySymbol('if'),
test,
HyExpression([HySymbol("do")] + list(body)),
])
@macro("unless")
def unless_macro(test, *body):
return HyExpression([
HySymbol('if'),
test,
HySymbol('None'),
HyExpression([HySymbol("do")] + list(body)),
])

126
hy/core/macros.hy
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@ -1,12 +1,118 @@
;;; hy core macros
;;; Hy core macros
;;
;; Copyright (c) 2013 Nicolas Dandrimont <nicolas.dandrimont@crans.org>
;; Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
;; Copyright (c) 2013 Konrad Hinsen <konrad.hinsen@fastmail.net>
;;
;; Permission is hereby granted, free of charge, to any person obtaining a
;; copy of this software and associated documentation files (the "Software"),
;; to deal in the Software without restriction, including without limitation
;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
;; and/or sell copies of the Software, and to permit persons to whom the
;; Software is furnished to do so, subject to the following conditions:
;;
;; The above copyright notice and this permission notice shall be included in
;; all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
;; DEALINGS IN THE SOFTWARE.
;;
;;; These macros form the hy language
;;; They are automatically required in every module, except inside hy.core
(defmacro if-python2 [python2-form python3-form]
(import sys)
(if (< (get sys.version_info 0) 3)
python2-form
python3-form))
(defmacro yield-from [_hy_yield_from_els]
(quasiquote
(for [_hy_yield_from_x (unquote _hy_yield_from_els)]
(yield _hy_yield_from_x))))
(defmacro for [args &rest body]
"shorthand for nested foreach loops:
(for [x foo y bar] baz) ->
(foreach [x foo]
(foreach [y bar]
baz))"
;; TODO: that signature sucks.
;; (for [[x foo] [y bar]] baz) would be more consistent
(if (% (len args) 2)
(macro-error args "for needs an even number of elements in its first argument"))
(if args
`(foreach [~(.pop args 0) ~(.pop args 0)] (for ~args ~@body))
`(do ~@body)))
(defmacro-alias [car first] [thing]
"Get the first element of a list/cons"
`(get ~thing 0))
(defmacro-alias [cdr rest] [thing]
"Get all the elements of a thing, except the first"
`(slice ~thing 1))
(defmacro cond [&rest branches]
"shorthand for nested ifs:
(cond [foo bar] [baz quux]) ->
(if foo
bar
(if baz
quux))"
(setv branches (iter branches))
(setv branch (next branches))
(defn check-branch [branch]
"check `cond` branch for validity, return the corresponding `if` expr"
(if (not (= (type branch) HyList))
(macro-error branch "cond branches need to be a list"))
(if (!= (len branch) 2)
(macro-error branch "cond branches need two items: a test and a code branch"))
(setv (, test thebranch) branch)
`(if ~test ~thebranch))
(setv root (check-branch branch))
(setv latest-branch root)
(foreach [branch branches]
(setv cur-branch (check-branch branch))
(.append latest-branch cur-branch)
(setv latest-branch cur-branch))
root)
(defmacro -> [head &rest rest]
;; TODO: fix the docstring by someone who understands this
(setv ret head)
(foreach [node rest]
(if (not (isinstance node HyExpression))
(setv node `(~node)))
(.insert node 1 ret)
(setv ret node))
ret)
(defmacro ->> [head &rest rest]
;; TODO: fix the docstring by someone who understands this
(setv ret head)
(foreach [node rest]
(if (not (isinstance node HyExpression))
(setv node `(~node)))
(.append node ret)
(setv ret node))
ret)
(defmacro when [test &rest body]
"Execute `body` when `test` is true"
`(if ~test (do ~@body)))
(defmacro unless [test &rest body]
"Execute `body` when `test` is false"
`(if ~test None (do ~@body)))
(defmacro yield-from [iterable]
"Yield all the items from iterable"
;; TODO: this needs some gensym love
`(foreach [_hy_yield_from_x ~iterable]
(yield _hy_yield_from_x)))

4
tests/native_tests/language.hy
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@ -122,8 +122,8 @@
(defn test-cond []
"NATIVE: test if cond sorta works."
(cond
((= 1 2) (assert (is true false)))
((is null null) (assert (is true true)))))
[(= 1 2) (assert (is true false))]
[(is null null) (assert (is true true))]))
(defn test-index []

8
tests/resources/argparse_ex.hy
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@ -12,7 +12,7 @@
;; using (cond) allows -i to take precedence over -c
(cond (args.i
(print (str args.i)))
(args.c
(print (str "got c"))))
(cond [args.i
(print (str args.i))]
[args.c
(print (str "got c"))])