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"""
Read and parse the file pari.desc
"""
#*****************************************************************************
# Copyright (C) 2015 Jeroen Demeyer <jdemeyer@cage.ugent.be>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
# http://www.gnu.org/licenses/
#*****************************************************************************
from __future__ import absolute_import, unicode_literals
import os, re, io
from .args import pari_arg_types
from .ret import pari_ret_types
from .paths import pari_share
paren_re = re.compile(r"[(](.*)[)]")
argname_re = re.compile(r"[ {]*&?([A-Za-z_][A-Za-z0-9_]*)")
def read_pari_desc():
"""
Read and parse the file ``pari.desc``.
The output is a dictionary where the keys are GP function names
and the corresponding values are dictionaries containing the
``(key, value)`` pairs from ``pari.desc``.
EXAMPLES::
>>> from autogen.parser import read_pari_desc
>>> D = read_pari_desc()
>>> Dcos = D["cos"]
>>> if "description" in Dcos: _ = Dcos.pop("description")
>>> Dcos.pop("doc").startswith('cosine of $x$.')
True
>>> Dcos == { 'class': 'basic',
... 'cname': 'gcos',
... 'function': 'cos',
... 'help': 'cos(x): cosine of x.',
... 'prototype': 'Gp',
... 'section': 'transcendental'}
True
"""
pari_desc = os.path.join(pari_share(), 'pari.desc')
with io.open(pari_desc, encoding="utf-8") as f:
lines = f.readlines()
n = 0
N = len(lines)
functions = {}
while n < N:
fun = {}
while True:
L = lines[n]; n += 1
if L == "\n":
break
# As long as the next lines start with a space, append them
while lines[n].startswith(" "):
L += (lines[n])[1:]; n += 1
key, value = L.split(":", 1)
# Change key to an allowed identifier name
key = key.lower().replace("-", "")
fun[key] = value.strip()
name = fun["function"]
functions[name] = fun
return functions
def parse_prototype(proto, help, initial_args=[]):
"""
Parse arguments and return type of a PARI function.
INPUT:
- ``proto`` -- a PARI prototype like ``"GD0,L,DGDGDG"``
- ``help`` -- a PARI help string like
``"qfbred(x,{flag=0},{d},{isd},{sd})"``
- ``initial_args`` -- other arguments to this function which come
before the PARI arguments, for example a ``self`` argument.
OUTPUT: a tuple ``(args, ret)`` where
- ``args`` is a list consisting of ``initial_args`` followed by
:class:`PariArgument` instances with all arguments of this
function.
- ``ret`` is a :class:`PariReturn` instance with the return type of
this function.
EXAMPLES::
>>> from autogen.parser import parse_prototype
>>> proto = 'GD0,L,DGDGDG'
>>> help = 'qfbred(x,{flag=0},{d},{isd},{sd})'
>>> parse_prototype(proto, help)
([GEN x, long flag=0, GEN d=NULL, GEN isd=NULL, GEN sd=NULL], GEN)
>>> proto = "GD&"
>>> help = "sqrtint(x,{&r})"
>>> parse_prototype(proto, help)
([GEN x, GEN* r=NULL], GEN)
>>> parse_prototype("lp", "foo()", [str("TEST")])
(['TEST', prec precision=0], long)
"""
# Use the help string just for the argument names.
# "names" should be an iterator over the argument names.
m = paren_re.search(help)
if m is None:
names = iter([])
else:
s = m.groups()[0]
matches = [argname_re.match(x) for x in s.split(",")]
names = (m.groups()[0] for m in matches if m is not None)
# First, handle the return type
try:
c = proto[0]
t = pari_ret_types[c]
n = 1 # index in proto
except (IndexError, KeyError):
t = pari_ret_types[""]
n = 0 # index in proto
ret = t()
# Go over the prototype characters and build up the arguments
args = list(initial_args)
have_default = False # Have we seen any default argument?
while n < len(proto):
c = proto[n]; n += 1
# Parse default value
if c == "D":
default = ""
if proto[n] not in pari_arg_types:
while True:
c = proto[n]; n += 1
if c == ",":
break
default += c
c = proto[n]; n += 1
else:
default = None
try:
t = pari_arg_types[c]
if t is None:
raise NotImplementedError('unsupported prototype character %r' % c)
except KeyError:
if c == ",":
continue # Just skip additional commas
else:
raise ValueError('unknown prototype character %r' % c)
arg = t(names, default, index=len(args))
if arg.default is not None:
have_default = True
elif have_default:
# We have a non-default argument following a default
# argument, which means trouble...
#
# A syntactical wart of Python is that it does not allow
# that: something like def foo(x=None, y) is a SyntaxError
# (at least with Python-2.7.13, Python-3.6.1 and Cython-0.25.2)
#
# A small number of GP functions (nfroots() for example)
# wants to do this anyway. Luckily, this seems to occur only
# for arguments of type GEN (prototype code "G")
#
# To work around this, we add a "fake" default value and
# then raise an error if it was not given...
if c != "G":
raise NotImplementedError("non-default argument after default argument is only implemented for GEN arguments")
arg.default = False
args.append(arg)
return (args, ret)
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