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-rw-r--r--lib/spack/external/spack_astunparse/unparser.py367
1 files changed, 177 insertions, 190 deletions
diff --git a/lib/spack/external/spack_astunparse/unparser.py b/lib/spack/external/spack_astunparse/unparser.py
index d3b57684d9..56e60c4c14 100644
--- a/lib/spack/external/spack_astunparse/unparser.py
+++ b/lib/spack/external/spack_astunparse/unparser.py
@@ -13,6 +13,7 @@ from six import StringIO
# TODO: if we require Python 3.7, use its `nullcontext()`
+@contextmanager
def nullcontext():
yield
@@ -101,6 +102,21 @@ class Unparser:
def block(self):
return self._Block(self)
+ @contextmanager
+ def delimit(self, start, end):
+ """A context manager for preparing the source for expressions. It adds
+ *start* to the buffer and enters, after exit it adds *end*."""
+
+ self.write(start)
+ yield
+ self.write(end)
+
+ def delimit_if(self, start, end, condition):
+ if condition:
+ return self.delimit(start, end)
+ else:
+ return nullcontext()
+
def dispatch(self, tree):
"Dispatcher function, dispatching tree type T to method _T."
if isinstance(tree, list):
@@ -135,11 +151,10 @@ class Unparser:
self.dispatch(tree.value)
def _NamedExpr(self, tree):
- self.write("(")
- self.dispatch(tree.target)
- self.write(" := ")
- self.dispatch(tree.value)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.dispatch(tree.target)
+ self.write(" := ")
+ self.dispatch(tree.value)
def _Import(self, t):
self.fill("import ")
@@ -172,11 +187,9 @@ class Unparser:
def _AnnAssign(self, t):
self.fill()
- if not t.simple and isinstance(t.target, ast.Name):
- self.write('(')
- self.dispatch(t.target)
- if not t.simple and isinstance(t.target, ast.Name):
- self.write(')')
+ with self.delimit_if(
+ "(", ")", not node.simple and isinstance(t.target, ast.Name)):
+ self.dispatch(t.target)
self.write(": ")
self.dispatch(t.annotation)
if t.value:
@@ -250,28 +263,25 @@ class Unparser:
interleave(lambda: self.write(", "), self.write, t.names)
def _Await(self, t):
- self.write("(")
- self.write("await")
- if t.value:
- self.write(" ")
- self.dispatch(t.value)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.write("await")
+ if t.value:
+ self.write(" ")
+ self.dispatch(t.value)
def _Yield(self, t):
- self.write("(")
- self.write("yield")
- if t.value:
- self.write(" ")
- self.dispatch(t.value)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.write("yield")
+ if t.value:
+ self.write(" ")
+ self.dispatch(t.value)
def _YieldFrom(self, t):
- self.write("(")
- self.write("yield from")
- if t.value:
- self.write(" ")
- self.dispatch(t.value)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.write("yield from")
+ if t.value:
+ self.write(" ")
+ self.dispatch(t.value)
def _Raise(self, t):
self.fill("raise")
@@ -356,35 +366,33 @@ class Unparser:
self.dispatch(deco)
self.fill("class "+t.name)
if six.PY3:
- self.write("(")
- comma = False
- for e in t.bases:
- if comma: self.write(", ")
- else: comma = True
- self.dispatch(e)
- for e in t.keywords:
- if comma: self.write(", ")
- else: comma = True
- self.dispatch(e)
- if sys.version_info[:2] < (3, 5):
- if t.starargs:
+ with self.delimit("(", ")"):
+ comma = False
+ for e in t.bases:
if comma: self.write(", ")
else: comma = True
- self.write("*")
- self.dispatch(t.starargs)
- if t.kwargs:
+ self.dispatch(e)
+ for e in t.keywords:
if comma: self.write(", ")
else: comma = True
- self.write("**")
- self.dispatch(t.kwargs)
- self.write(")")
+ self.dispatch(e)
+ if sys.version_info[:2] < (3, 5):
+ if t.starargs:
+ if comma: self.write(", ")
+ else: comma = True
+ self.write("*")
+ self.dispatch(t.starargs)
+ if t.kwargs:
+ if comma: self.write(", ")
+ else: comma = True
+ self.write("**")
+ self.dispatch(t.kwargs)
elif t.bases:
- self.write("(")
+ with self.delimit("(", ")"):
for a in t.bases[:-1]:
self.dispatch(a)
self.write(", ")
self.dispatch(t.bases[-1])
- self.write(")")
with self.block():
self.dispatch(t.body)
@@ -399,10 +407,10 @@ class Unparser:
for deco in t.decorator_list:
self.fill("@")
self.dispatch(deco)
- def_str = fill_suffix+" "+t.name + "("
+ def_str = fill_suffix + " " + t.name
self.fill(def_str)
- self.dispatch(t.args)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.dispatch(t.args)
if getattr(t, "returns", False):
self.write(" -> ")
self.dispatch(t.returns)
@@ -574,13 +582,12 @@ class Unparser:
def _Constant(self, t):
value = t.value
if isinstance(value, tuple):
- self.write("(")
- if len(value) == 1:
- self._write_constant(value[0])
- self.write(",")
- else:
- interleave(lambda: self.write(", "), self._write_constant, value)
- self.write(")")
+ with self.delimit("(", ")"):
+ if len(value) == 1:
+ self._write_constant(value[0])
+ self.write(",")
+ else:
+ interleave(lambda: self.write(", "), self._write_constant, value)
elif value is Ellipsis: # instead of `...` for Py2 compatibility
self.write("...")
else:
@@ -594,49 +601,41 @@ class Unparser:
self.write(repr_n.replace("inf", INFSTR))
else:
# Parenthesize negative numbers, to avoid turning (-1)**2 into -1**2.
- if repr_n.startswith("-"):
- self.write("(")
- if "inf" in repr_n and repr_n.endswith("*j"):
- repr_n = repr_n.replace("*j", "j")
- # Substitute overflowing decimal literal for AST infinities.
- self.write(repr_n.replace("inf", INFSTR))
- if repr_n.startswith("-"):
- self.write(")")
+ with self.delimit_if("(", ")", repr_n.startswith("-")):
+ if "inf" in repr_n and repr_n.endswith("*j"):
+ repr_n = repr_n.replace("*j", "j")
+ # Substitute overflowing decimal literal for AST infinities.
+ self.write(repr_n.replace("inf", INFSTR))
def _List(self, t):
- self.write("[")
- interleave(lambda: self.write(", "), self.dispatch, t.elts)
- self.write("]")
+ with self.delimit("[", "]"):
+ interleave(lambda: self.write(", "), self.dispatch, t.elts)
def _ListComp(self, t):
- self.write("[")
- self.dispatch(t.elt)
- for gen in t.generators:
- self.dispatch(gen)
- self.write("]")
+ with self.delimit("[", "]"):
+ self.dispatch(t.elt)
+ for gen in t.generators:
+ self.dispatch(gen)
def _GeneratorExp(self, t):
- self.write("(")
- self.dispatch(t.elt)
- for gen in t.generators:
- self.dispatch(gen)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.dispatch(t.elt)
+ for gen in t.generators:
+ self.dispatch(gen)
def _SetComp(self, t):
- self.write("{")
- self.dispatch(t.elt)
- for gen in t.generators:
- self.dispatch(gen)
- self.write("}")
+ with self.delimit("{", "}"):
+ self.dispatch(t.elt)
+ for gen in t.generators:
+ self.dispatch(gen)
def _DictComp(self, t):
- self.write("{")
- self.dispatch(t.key)
- self.write(": ")
- self.dispatch(t.value)
- for gen in t.generators:
- self.dispatch(gen)
- self.write("}")
+ with self.delimit("{", "}"):
+ self.dispatch(t.key)
+ self.write(": ")
+ self.dispatch(t.value)
+ for gen in t.generators:
+ self.dispatch(gen)
def _comprehension(self, t):
if getattr(t, 'is_async', False):
@@ -651,22 +650,19 @@ class Unparser:
self.dispatch(if_clause)
def _IfExp(self, t):
- self.write("(")
- self.dispatch(t.body)
- self.write(" if ")
- self.dispatch(t.test)
- self.write(" else ")
- self.dispatch(t.orelse)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.dispatch(t.body)
+ self.write(" if ")
+ self.dispatch(t.test)
+ self.write(" else ")
+ self.dispatch(t.orelse)
def _Set(self, t):
assert(t.elts) # should be at least one element
- self.write("{")
- interleave(lambda: self.write(", "), self.dispatch, t.elts)
- self.write("}")
+ with self.delimit("{", "}"):
+ interleave(lambda: self.write(", "), self.dispatch, t.elts)
def _Dict(self, t):
- self.write("{")
def write_key_value_pair(k, v):
self.dispatch(k)
self.write(": ")
@@ -681,64 +677,59 @@ class Unparser:
self.dispatch(v)
else:
write_key_value_pair(k, v)
- interleave(lambda: self.write(", "), write_item, zip(t.keys, t.values))
- self.write("}")
+
+ with self.delimit("{", "}"):
+ interleave(lambda: self.write(", "), write_item, zip(t.keys, t.values))
def _Tuple(self, t):
- self.write("(")
- if len(t.elts) == 1:
- elt = t.elts[0]
- self.dispatch(elt)
- self.write(",")
- else:
- interleave(lambda: self.write(", "), self.dispatch, t.elts)
- self.write(")")
+ with self.delimit("(", ")"):
+ if len(t.elts) == 1:
+ elt = t.elts[0]
+ self.dispatch(elt)
+ self.write(",")
+ else:
+ interleave(lambda: self.write(", "), self.dispatch, t.elts)
unop = {"Invert":"~", "Not": "not", "UAdd":"+", "USub":"-"}
def _UnaryOp(self, t):
- self.write("(")
- self.write(self.unop[t.op.__class__.__name__])
- if not self._py_ver_consistent:
- self.write(" ")
- if six.PY2 and isinstance(t.op, ast.USub) and isinstance(t.operand, ast.Num):
- # If we're applying unary minus to a number, parenthesize the number.
- # This is necessary: -2147483648 is different from -(2147483648) on
- # a 32-bit machine (the first is an int, the second a long), and
- # -7j is different from -(7j). (The first has real part 0.0, the second
- # has real part -0.0.)
- self.write("(")
- self.dispatch(t.operand)
- self.write(")")
- else:
- self.dispatch(t.operand)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.write(self.unop[t.op.__class__.__name__])
+ if not self._py_ver_consistent:
+ self.write(" ")
+ if six.PY2 and isinstance(t.op, ast.USub) and isinstance(t.operand, ast.Num):
+ # If we're applying unary minus to a number, parenthesize the number.
+ # This is necessary: -2147483648 is different from -(2147483648) on
+ # a 32-bit machine (the first is an int, the second a long), and
+ # -7j is different from -(7j). (The first has real part 0.0, the second
+ # has real part -0.0.)
+ with self.delimit("(", ")"):
+ self.dispatch(t.operand)
+ else:
+ self.dispatch(t.operand)
binop = { "Add":"+", "Sub":"-", "Mult":"*", "MatMult":"@", "Div":"/", "Mod":"%",
"LShift":"<<", "RShift":">>", "BitOr":"|", "BitXor":"^", "BitAnd":"&",
"FloorDiv":"//", "Pow": "**"}
def _BinOp(self, t):
- self.write("(")
- self.dispatch(t.left)
- self.write(" " + self.binop[t.op.__class__.__name__] + " ")
- self.dispatch(t.right)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.dispatch(t.left)
+ self.write(" " + self.binop[t.op.__class__.__name__] + " ")
+ self.dispatch(t.right)
cmpops = {"Eq":"==", "NotEq":"!=", "Lt":"<", "LtE":"<=", "Gt":">", "GtE":">=",
"Is":"is", "IsNot":"is not", "In":"in", "NotIn":"not in"}
def _Compare(self, t):
- self.write("(")
- self.dispatch(t.left)
- for o, e in zip(t.ops, t.comparators):
- self.write(" " + self.cmpops[o.__class__.__name__] + " ")
- self.dispatch(e)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.dispatch(t.left)
+ for o, e in zip(t.ops, t.comparators):
+ self.write(" " + self.cmpops[o.__class__.__name__] + " ")
+ self.dispatch(e)
boolops = {ast.And: 'and', ast.Or: 'or'}
def _BoolOp(self, t):
- self.write("(")
- s = " %s " % self.boolops[t.op.__class__]
- interleave(lambda: self.write(s), self.dispatch, t.values)
- self.write(")")
+ with self.delimit("(", ")"):
+ s = " %s " % self.boolops[t.op.__class__]
+ interleave(lambda: self.write(s), self.dispatch, t.values)
def _Attribute(self,t):
self.dispatch(t.value)
@@ -752,55 +743,52 @@ class Unparser:
def _Call(self, t):
self.dispatch(t.func)
- self.write("(")
- comma = False
-
- # move starred arguments last in Python 3.5+, for consistency w/earlier versions
- star_and_kwargs = []
- move_stars_last = sys.version_info[:2] >= (3, 5)
+ with self.delimit("(", ")"):
+ comma = False
- for e in t.args:
- if move_stars_last and isinstance(e, ast.Starred):
- star_and_kwargs.append(e)
- else:
- if comma: self.write(", ")
- else: comma = True
- self.dispatch(e)
+ # starred arguments last in Python 3.5+, for consistency w/earlier versions
+ star_and_kwargs = []
+ move_stars_last = sys.version_info[:2] >= (3, 5)
- for e in t.keywords:
- # starting from Python 3.5 this denotes a kwargs part of the invocation
- if e.arg is None and move_stars_last:
- star_and_kwargs.append(e)
- else:
- if comma: self.write(", ")
- else: comma = True
- self.dispatch(e)
+ for e in t.args:
+ if move_stars_last and isinstance(e, ast.Starred):
+ star_and_kwargs.append(e)
+ else:
+ if comma: self.write(", ")
+ else: comma = True
+ self.dispatch(e)
- if move_stars_last:
- for e in star_and_kwargs:
- if comma: self.write(", ")
- else: comma = True
- self.dispatch(e)
+ for e in t.keywords:
+ # starting from Python 3.5 this denotes a kwargs part of the invocation
+ if e.arg is None and move_stars_last:
+ star_and_kwargs.append(e)
+ else:
+ if comma: self.write(", ")
+ else: comma = True
+ self.dispatch(e)
- if sys.version_info[:2] < (3, 5):
- if t.starargs:
- if comma: self.write(", ")
- else: comma = True
- self.write("*")
- self.dispatch(t.starargs)
- if t.kwargs:
- if comma: self.write(", ")
- else: comma = True
- self.write("**")
- self.dispatch(t.kwargs)
+ if move_stars_last:
+ for e in star_and_kwargs:
+ if comma: self.write(", ")
+ else: comma = True
+ self.dispatch(e)
- self.write(")")
+ if sys.version_info[:2] < (3, 5):
+ if t.starargs:
+ if comma: self.write(", ")
+ else: comma = True
+ self.write("*")
+ self.dispatch(t.starargs)
+ if t.kwargs:
+ if comma: self.write(", ")
+ else: comma = True
+ self.write("**")
+ self.dispatch(t.kwargs)
def _Subscript(self, t):
self.dispatch(t.value)
- self.write("[")
- self.dispatch(t.slice)
- self.write("]")
+ with self.delimit("[", "]"):
+ self.dispatch(t.slice)
def _Starred(self, t):
self.write("*")
@@ -902,12 +890,11 @@ class Unparser:
self.dispatch(t.value)
def _Lambda(self, t):
- self.write("(")
- self.write("lambda ")
- self.dispatch(t.args)
- self.write(": ")
- self.dispatch(t.body)
- self.write(")")
+ with self.delimit("(", ")"):
+ self.write("lambda ")
+ self.dispatch(t.args)
+ self.write(": ")
+ self.dispatch(t.body)
def _alias(self, t):
self.write(t.name)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-17 22:24:53 +0000