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str.py
645 lines (488 loc) · 19.5 KB
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str.py
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"""A Printer for generating readable representation of most diofant classes."""
import mpmath.libmp as mlib
from mpmath.libmp import prec_to_dps
from ..core import Integer, Mul, Pow, Rational, S, oo
from ..core.mul import _keep_coeff
from ..sets import Reals
from ..utilities import default_sort_key
from .defaults import DefaultPrinting
from .precedence import PRECEDENCE, precedence
from .printer import Printer
class StrPrinter(Printer):
"""Str printer."""
printmethod = '_diofantstr'
_default_settings = {
'order': None,
'full_prec': 'auto',
}
_relationals: dict[str, str] = {}
def parenthesize(self, item, level):
if precedence(item) <= level:
return f'({self._print(item)})'
return self._print(item)
def stringify(self, args, sep, level=0):
return sep.join([self.parenthesize(item, level) for item in args])
def emptyPrinter(self, expr):
if isinstance(expr, str):
return expr
if hasattr(expr, '__str__') and not issubclass(expr.__class__,
DefaultPrinting):
return str(expr)
return repr(expr)
def _print_Add(self, expr, order=None):
if self.order == 'none':
terms = list(expr.args)
else:
terms = expr.as_ordered_terms(order=order or self.order)
PREC = precedence(expr)
l = []
for term in terms:
t = self._print(term)
if t.startswith('-'):
sign = '-'
t = t[1:]
else:
sign = '+'
if precedence(term) < PREC:
l.extend([sign, f'({t})'])
else:
l.extend([sign, t])
sign = l.pop(0)
if sign == '+':
sign = ''
return sign + ' '.join(l)
def _print_BooleanTrue(self, expr):
return 'true'
def _print_BooleanFalse(self, expr):
return 'false'
def _print_Not(self, expr):
return f"~{self.parenthesize(expr.args[0], PRECEDENCE['Not'])}"
def _print_And(self, expr):
return self.stringify(expr.args, ' & ', PRECEDENCE['BitwiseAnd'])
def _print_Or(self, expr):
return self.stringify(expr.args, ' | ', PRECEDENCE['BitwiseOr'])
def _print_Basic(self, expr):
l = [self._print(o) for o in expr.args]
return expr.__class__.__name__ + f"({', '.join(l)})"
def _print_BlockMatrix(self, B):
return self._print(B.blocks)
def _print_Catalan(self, expr):
return 'Catalan'
def _print_ComplexInfinity(self, expr):
return 'zoo'
def _print_Derivative(self, expr):
return f"Derivative({', '.join(map(self._print, expr.args))})"
def _print_dict(self, d):
keys = sorted(d, key=default_sort_key)
items = []
for key in keys:
item = f'{self._print(key)}: {self._print(d[key])}'
items.append(item)
return f"{{{', '.join(items)}}}"
def _print_Dict(self, expr):
return self._print_dict(expr)
def _print_Dummy(self, expr):
return '_' + expr.name
def _print_EulerGamma(self, expr):
return 'EulerGamma'
def _print_Exp1(self, expr):
return 'E'
def _print_ExprCondPair(self, expr):
return f'({expr.expr}, {expr.cond})'
def _print_FiniteSet(self, s):
s = sorted(s, key=default_sort_key)
if len(s) > 10:
printset = s[:3] + ['...'] + s[-3:]
else:
printset = s
return '{' + ', '.join(self._print(el) for el in printset) + '}'
def _print_Function(self, expr):
return expr.func.__name__ + f"({self.stringify(expr.args, ', ')})"
def _print_GoldenRatio(self, expr):
return 'GoldenRatio'
def _print_ImaginaryUnit(self, expr):
return 'I'
def _print_Infinity(self, expr):
return 'oo'
def _print_Integral(self, expr):
def _xab_tostr(xab):
if len(xab) == 1:
return self._print(xab[0])
return self._print((xab[0],) + tuple(xab[1:]))
L = ', '.join([_xab_tostr(l) for l in expr.limits])
return f'Integral({self._print(expr.function)}, {L})'
def _print_Interval(self, i):
if i.left_open:
left = '('
else:
left = '['
if i.right_open:
right = ')'
else:
right = ']'
return f'{left}{self._print(i.start)}, {self._print(i.end)}{right}'
def _print_Inverse(self, I):
return f"{self.parenthesize(I.arg, PRECEDENCE['Pow'])}^-1"
def _print_Lambda(self, obj):
args, expr = obj.args
if len(args) == 1:
return f'Lambda({args.args[0]}, {expr})'
arg_string = ', '.join(self._print(arg) for arg in args)
return f'Lambda(({arg_string}), {expr})'
def _print_LatticeOp(self, expr):
args = sorted(expr.args, key=default_sort_key)
return expr.func.__name__ + f"({', '.join(self._print(arg) for arg in args)})"
def _print_Limit(self, expr):
e, z, z0, dir = expr.args
if dir == -1 or z0 in (oo, -oo):
return f'Limit({e}, {z}, {z0})'
if dir == Reals:
return f'Limit({e}, {z}, {z0}, dir=Reals)'
return f'Limit({e}, {z}, {z0}, dir={dir})'
def _print_list(self, expr):
return f"[{self.stringify(expr, ', ')}]"
def _print_MatrixBase(self, expr):
return expr._format_str(self)
def _print_MatrixElement(self, expr):
return self._print(expr.parent) + f'[{expr.i}, {expr.j}]'
def _print_MatrixSlice(self, expr):
def strslice(x):
x = list(x)
if x[2] == 1:
del x[2]
if x[1] == x[0] + 1:
del x[1]
if x[0] == 0:
x[0] = ''
return ':'.join(map(self._print, x))
return (self._print(expr.parent) + '[' +
strslice(expr.rowslice) + ', ' +
strslice(expr.colslice) + ']')
def _print_Mul(self, expr):
prec = precedence(expr)
c, e = expr.as_coeff_Mul()
if c < 0:
expr = _keep_coeff(-c, e)
sign = '-'
else:
sign = ''
a = [] # items in the numerator
b = [] # items that are in the denominator (if any)
if self.order != 'none':
args = expr.as_ordered_factors()
else:
# use make_args in case expr was something like -x -> x
args = Mul.make_args(expr)
multiple_ones = len([x for x in args if x == 1]) > 1
# Gather args for numerator/denominator
for item in args:
if item.is_commutative and item.is_Pow and item.exp.is_Rational and item.exp.is_negative:
if item.exp != -1:
b.append(Pow(item.base, -item.exp, evaluate=False))
else:
b.append(Pow(item.base, -item.exp))
elif item.is_Rational and item is not oo:
if item.numerator != 1 or multiple_ones:
a.append(Rational(item.numerator))
if item.denominator != 1:
b.append(Rational(item.denominator))
else:
a.append(item)
a = a or [Integer(1)]
a_str = [self.parenthesize(x, prec) for x in a]
b_str = [self.parenthesize(x, prec) for x in b]
if len(b) == 0:
return sign + '*'.join(a_str)
if len(b) == 1:
return sign + '*'.join(a_str) + '/' + b_str[0]
return sign + '*'.join(a_str) + f"/({'*'.join(b_str)})"
def _print_MatMul(self, expr):
return '*'.join([self.parenthesize(arg, precedence(expr))
for arg in expr.args])
def _print_HadamardProduct(self, expr):
return '.*'.join([self.parenthesize(arg, precedence(expr))
for arg in expr.args])
def _print_MatAdd(self, expr):
return ' + '.join([self.parenthesize(arg, precedence(expr))
for arg in expr.args])
def _print_NaN(self, expr):
return 'nan'
def _print_NegativeInfinity(self, expr):
return '-oo'
def _print_Order(self, expr):
if all(p == 0 for p in expr.point) or not expr.variables:
return f'O({self._print(expr.expr)})'
return f"O({self.stringify(expr.args, ', ', 0)})"
def _print_Cycle(self, expr):
"""We want it to print as Cycle in doctests for which a repr is required.
With __repr__ defined in Cycle, interactive output gives Cycle form but
during doctests, the dict's __repr__ form is used. Defining this _print
function solves that problem.
>>> Cycle(1, 2) # will print as a dict without this method
Cycle(1, 2)
"""
return repr(expr)
def _print_Permutation(self, expr):
from ..combinatorics import Cycle, Permutation
if Permutation.print_cyclic:
if not expr.size:
return 'Permutation()'
# before taking Cycle notation, see if the last element is
# a singleton and move it to the head of the string
s = repr(Cycle(expr)(expr.size - 1))[len('Cycle'):]
last = s.rfind('(')
if not last == 0 and ',' not in s[last:]:
s = s[last:] + s[:last]
return f'Permutation{s}'
s = expr.support()
if not s:
if expr.size < 5:
return f'Permutation({expr.array_form!s})'
return f'Permutation([], size={expr.size})'
trim = str(expr.array_form[:s[-1] + 1]) + f', size={expr.size}'
use = full = str(expr.array_form)
if len(trim) < len(full):
use = trim
return f'Permutation({use})'
def _print_TensorIndex(self, expr):
return expr._print()
def _print_TensorHead(self, expr):
return expr._print()
def _print_Tensor(self, expr):
return expr._print()
def _print_TensMul(self, expr):
return expr._print()
def _print_TensAdd(self, expr):
return expr._print()
def _print_PermutationGroup(self, expr):
p = [f' {a!s}' for a in expr.args]
return 'PermutationGroup([\n{}])'.format(',\n'.join(p)) # noqa: SFS201
def _print_Pi(self, expr):
return 'pi'
def _print_PolyElement(self, poly):
return poly._str(self, PRECEDENCE, '%s**%d', '*')
def _print_FracElement(self, frac):
if frac.denominator == 1:
return self._print(frac.numerator)
numer = self.parenthesize(frac.numerator, PRECEDENCE['Add'])
denom = self.parenthesize(frac.denominator, PRECEDENCE['Atom']-1)
return numer + '/' + denom
def _print_Poly(self, expr):
terms, gens = [], expr.gens
for monom, coeff in expr.terms():
s_monom = []
for i, exp in enumerate(monom):
if exp > 0:
if exp == 1:
s_monom.append(self._print(gens[i]))
else:
s_monom.append(self.parenthesize(gens[i],
PRECEDENCE['Atom'] - 1) + f'**{exp:d}')
s_monom = '*'.join(s_monom)
if coeff.is_Add:
if s_monom:
s_coeff = '(' + self._print(coeff) + ')'
else:
s_coeff = self._print(coeff)
else:
if s_monom:
if coeff == 1:
terms.extend(['+', s_monom])
continue
if coeff == -1:
terms.extend(['-', s_monom])
continue
s_coeff = self._print(coeff)
if not s_monom:
s_term = s_coeff
else:
s_term = s_coeff + '*' + s_monom
if s_term.startswith('-'):
terms.extend(['-', s_term[1:]])
else:
terms.extend(['+', s_term])
if not terms:
terms.extend(['+', '0'])
modifier = terms.pop(0)
if modifier == '-':
terms[0] = '-' + terms[0]
format = expr.__class__.__name__ + '(%s, %s'
from ..polys.polyerrors import PolynomialError
try:
format += f', modulus={expr.get_modulus()}'
except PolynomialError:
format += f", domain='{expr.domain}'"
format += ')'
return format % (' '.join(terms), ', '.join(self._print(s) for s in expr.gens))
def _print_ProductSet(self, p):
return ' x '.join(self._print(set) for set in p.sets)
def _print_AlgebraicElement(self, expr):
return self._print(expr.parent.to_expr(expr))
def _print_ModularInteger(self, expr):
return f'{expr.rep}'
def _print_GaloisFieldElement(self, expr):
from ..domains import ZZ_python
return f'GF({expr.parent.characteristic}, {expr.mod.set_domain(ZZ_python).all_coeffs()})({int(expr)})'
def _print_Pow(self, expr, rational=False):
PREC = precedence(expr)
if not expr.exp.is_Float and expr.exp == Rational(1, 2) and not rational:
return f'sqrt({self._print(expr.base)})'
if expr.is_commutative and not expr.exp.is_Float:
if -expr.exp == Rational(1, 2) and not rational:
return f'1/sqrt({self._print(expr.base)})'
if expr.exp == -1:
return f'1/{self.parenthesize(expr.base, PREC)}'
e = self.parenthesize(expr.exp, PREC)
if (self.printmethod == '_diofantrepr' and
expr.exp.is_Rational and not expr.exp.is_Integer):
# The parenthesized exp should be '(Rational(a, b))' so strip
# parens, but just check to be sure.
return f'{self.parenthesize(expr.base, PREC)}**{e[1:-1]}'
return f'{self.parenthesize(expr.base, PREC)}**{e}'
def _print_Mod(self, expr):
PREC = precedence(expr)
a, b = expr.args
return f'{self.parenthesize(a, PREC)}%{self.parenthesize(b, PREC)}'
def _print_MatPow(self, expr):
PREC = precedence(expr)
return f'{self.parenthesize(expr.base, PREC)}**{self.parenthesize(expr.exp, PREC)}'
def _print_ImmutableDenseNDimArray(self, expr):
return str(expr)
_print_ImmutableSparseNDimArray = _print_ImmutableDenseNDimArray
_print_MutableDenseNDimArray = _print_ImmutableDenseNDimArray
_print_MutableSparseNDimArray = _print_ImmutableDenseNDimArray
def _print_Integer(self, expr):
return str(expr.numerator)
def _print_Rational(self, expr):
if expr.denominator == 1:
return str(expr.numerator)
return f'{expr.numerator}/{expr.denominator}'
def _print_Float(self, expr):
prec = expr._prec
if prec < 5:
dps = 0
else:
dps = prec_to_dps(expr._prec)
if self._settings['full_prec'] is True:
strip = False
elif self._settings['full_prec'] is False:
strip = True
elif self._settings['full_prec'] == 'auto':
strip = self._print_level > 1
else:
raise NotImplementedError
rv = mlib.to_str(expr._mpf_, dps, strip_zeros=strip)
if rv.startswith('-.0'):
rv = '-0.' + rv[3:]
elif rv.startswith('.0'):
rv = '0.' + rv[2:]
elif rv.startswith('+'):
rv = rv[1:]
return rv
def _print_Relational(self, expr):
charmap = {
'==': 'Eq',
'!=': 'Ne',
}
if expr.rel_op in charmap:
return f'{charmap[expr.rel_op]}({expr.lhs}, {expr.rhs})'
return f'{self.parenthesize(expr.lhs, precedence(expr))} {self._relationals.get(expr.rel_op) or expr.rel_op} {self.parenthesize(expr.rhs, precedence(expr))}'
def _print_RootOf(self, expr):
p = self._print_Add(expr.expr, order='lex')
if expr.free_symbols:
return f'RootOf({p}, {expr.poly.gen}, {expr.index:d})'
return f'RootOf({p}, {expr.index:d})'
def _print_RootSum(self, expr):
args = [self._print_Add(expr.expr, order='lex')]
if expr.fun is not S.IdentityFunction:
args.append(self._print(expr.fun))
return f"RootSum({', '.join(args)})"
def _print_GroebnerBasis(self, basis):
cls = basis.__class__.__name__
exprs = [self._print_Add(arg, order=basis.order)
for arg in basis.exprs]
exprs = f"[{', '.join(exprs)}]"
gens = [self._print(gen) for gen in basis.gens]
domain = f"domain='{self._print(basis.domain)}'"
order = f"order='{self._print(basis.order)}'"
args = [exprs] + gens + [domain, order]
return f"{cls}({', '.join(args)})"
def _print_frozenset(self, s):
items = sorted(s, key=default_sort_key)
args = ', '.join(self._print(item) for item in items)
if args:
args = f'{{{args}}}'
return f'{type(s).__name__}({args})'
def _print_set(self, expr):
if expr == set():
return 'set()'
return f"{{{self.stringify(sorted(expr, key=default_sort_key), ', ')}}}"
def _print_Sum(self, expr):
def _xab_tostr(xab):
return self._print((xab[0],) + tuple(xab[1:]))
L = ', '.join([_xab_tostr(l) for l in expr.limits])
return f'Sum({self._print(expr.function)}, {L})'
def _print_Symbol(self, expr):
return expr.name
_print_BaseSymbol = _print_Symbol
_print_MatrixSymbol = _print_Symbol
_print_RandomSymbol = _print_Symbol
def _print_Identity(self, expr):
return 'I'
def _print_ZeroMatrix(self, expr):
return '0'
def _print_str(self, expr):
return expr
def _print_tuple(self, expr):
if len(expr) == 1:
return f'({self._print(expr[0])},)'
return f"({self.stringify(expr, ', ')})"
def _print_Tuple(self, expr):
return self._print_tuple(expr)
def _print_Monomial(self, expr):
if expr.gens:
return '*'.join([f'{gen}**{exp}'
for gen, exp in zip(expr.gens, expr)])
return self._print_tuple(expr)
def _print_Transpose(self, T):
return f"{self.parenthesize(T.arg, PRECEDENCE['Pow'])}.T"
def _print_Union(self, expr):
return ' U '.join(self._print(set) for set in expr.args)
def _print_Complement(self, expr):
return r' \ '.join(self._print(set) for set in expr.args)
def _print_Wild(self, expr):
return expr.name + '_'
def _print_WildFunction(self, expr):
return expr.name + '_'
def _print_Zero(self, expr):
return '0'
def _print_Tr(self, expr):
# TODO : Handle indices
return f"{'Tr'}({self._print(expr.args[0])})"
def _print_Domain(self, expr):
return expr.rep
def sstr(expr, **settings):
"""Returns the expression as a string.
For large expressions where speed is a concern, use the setting
order='none'.
Examples
========
>>> sstr(Eq(a + b, 0))
'Eq(a + b, 0)'
"""
p = StrPrinter(settings)
s = p.doprint(expr)
return s
class StrReprPrinter(StrPrinter):
"""(internal) -- see sstrrepr"""
def _print_str(self, expr):
return repr(expr)
def sstrrepr(expr, **settings):
"""Return expr in mixed str/repr form.
i.e. strings are returned in repr form with quotes, and everything else
is returned in str form.
This function could be useful for hooking into sys.displayhook
"""
p = StrReprPrinter(settings)
s = p.doprint(expr)
return s