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|
from rpython.rlib.rutf8 import Utf8StringBuilder
from rpython.rlib.objectmodel import specialize
from pypy.interpreter.pyparser.error import SyntaxError
from pypy.interpreter.error import oefmt, OperationError
from pypy.interpreter.astcompiler import ast
PRIORITY_TUPLE = 0
PRIORITY_TEST = 1 # 'if'-'else', 'lambda'
PRIORITY_OR = 2 # 'or'
PRIORITY_AND = 3 # 'and'
PRIORITY_NOT = 4 # 'not'
PRIORITY_CMP = 5 # '<', '>', '==', '>=', '<=', '!=',
# 'in', 'not in', 'is', 'is not'
PRIORITY_EXPR = 6
PRIORITY_BOR = PRIORITY_EXPR = 7 # '|'
PRIORITY_BXOR = 8 # '^'
PRIORITY_BAND = 9 # '&'
PRIORITY_SHIFT = 10 # '<<', '>>'
PRIORITY_ARITH = 11 # '+', '-'
PRIORITY_TERM = 12 # '*', '@', '/', '%', '//'
PRIORITY_FACTOR = 13 # unary '+', '-', '~'
PRIORITY_POWER = 14 # '**'
PRIORITY_AWAIT = 15 # 'await'
PRIORITY_ATOM = 16
class Parenthesizer(object):
def __init__(self, visitor, priority):
self.visitor = visitor
self.priority = priority
def __enter__(self):
visitor = self.visitor
level = visitor.level
if level > self.priority:
visitor.append_ascii("(")
def __exit__(self, *args):
visitor = self.visitor
level = visitor.level
if level > self.priority:
visitor.append_ascii(")")
class Utf8BuilderVisitor(ast.ASTVisitor):
def __init__(self, space):
self.space = space
self.builder = Utf8StringBuilder()
def append_w_str(self, w_s):
s, l = self.space.utf8_len_w(w_s)
self.builder.append_utf8(s, l)
def append_ascii(self, s):
self.builder.append_utf8(s, len(s))
def append_utf8(self, s):
self.builder.append(s)
class UnparseVisitor(Utf8BuilderVisitor):
def __init__(self, space, startlevel=PRIORITY_TEST):
Utf8BuilderVisitor.__init__(self, space)
self.level = startlevel
def maybe_parenthesize(self, priority):
return Parenthesizer(self, priority)
def append_expr(self, node, priority=PRIORITY_TEST):
level = self.level
self.level = priority
try:
node.walkabout(self)
finally:
self.level = level
def append_if_not_first(self, first, s):
if not first:
self.append_ascii(s)
return False
def default_visitor(self, node):
raise OperationError(self.space.w_SystemError,
self.space.newtext("expression type not supported yet" + str(node)))
def visit_Constant(self, node):
if self.space.is_w(node.value, self.space.w_Ellipsis):
return self.append_ascii("...")
if (
self.space.isinstance_w(node.value, self.space.w_bytes)
or self.space.isinstance_w(node.value, self.space.w_unicode)
):
res = self.space.repr(node.value)
else:
res = self.space.str(node.value)
self.append_w_str(res)
def visit_Name(self, node):
self.builder.append(node.id)
def visit_UnaryOp(self, node):
op = node.op
if op == ast.Invert:
priority = PRIORITY_FACTOR
op = "~"
elif op == ast.Not:
priority = PRIORITY_NOT
op = "not "
elif op == ast.UAdd:
priority = PRIORITY_FACTOR
op = "+"
elif op == ast.USub:
priority = PRIORITY_FACTOR
op = "-"
else:
raise oefmt(self.space.w_SystemError,
"unknown unary operator")
with self.maybe_parenthesize(priority):
self.append_ascii(op)
self.append_expr(node.operand, priority)
def visit_BinOp(self, node):
right_associative = False
op = node.op
if op == ast.Add:
op = " + "
priority = PRIORITY_ARITH
elif op == ast.Sub:
op = " - "
priority = PRIORITY_ARITH
elif op == ast.Mult:
op = " * "
priority = PRIORITY_TERM
elif op == ast.MatMult:
op = " @ "
priority = PRIORITY_TERM
elif op == ast.Div:
op = " / "
priority = PRIORITY_TERM
elif op == ast.FloorDiv:
op = " // "
priority = PRIORITY_TERM
elif op == ast.Mod:
op = " % "
priority = PRIORITY_TERM
elif op == ast.LShift:
op = " << "
priority = PRIORITY_SHIFT
elif op == ast.RShift:
op = " >> "
priority = PRIORITY_SHIFT
elif op == ast.BitOr:
op = " | "
priority = PRIORITY_BOR
elif op == ast.BitXor:
op = " ^ "
priority = PRIORITY_BXOR
elif op == ast.BitAnd:
op = " & "
priority = PRIORITY_BAND
elif op == ast.Pow:
op = " ** "
priority = PRIORITY_POWER
right_associative = True
else:
raise oefmt(self.space.w_SystemError,
"unknown unary operator")
with self.maybe_parenthesize(priority):
self.append_expr(node.left, priority + right_associative)
self.append_ascii(op)
self.append_expr(node.right, priority + (not right_associative))
def visit_BoolOp(self, node):
if node.op == ast.And:
op = " and "
priority = PRIORITY_AND
else:
op = " or "
priority = PRIORITY_OR
with self.maybe_parenthesize(priority):
for i, value in enumerate(node.values):
if i > 0:
self.append_ascii(op)
self.append_expr(value, priority + 1)
def visit_Compare(self, node):
with self.maybe_parenthesize(PRIORITY_CMP):
self.append_expr(node.left, PRIORITY_CMP + 1)
for i in range(len(node.comparators)):
op = node.ops[i]
value = node.comparators[i]
if op == ast.Eq:
op = " == "
elif op == ast.NotEq:
op = " != "
elif op == ast.Lt:
op = " < "
elif op == ast.LtE:
op = " <= "
elif op == ast.Gt:
op = " > "
elif op == ast.GtE:
op = " >= "
elif op == ast.Is:
op = " is "
elif op == ast.IsNot:
op = " is not "
elif op == ast.In:
op = " in "
elif op == ast.NotIn:
op = " not in "
else:
raise oefmt(self.space.w_SystemError,
"unknown comparator")
self.append_ascii(op)
self.append_expr(value, PRIORITY_CMP + 1)
def visit_IfExp(self, node):
with self.maybe_parenthesize(PRIORITY_TEST):
self.append_expr(node.body, PRIORITY_TEST + 1)
self.append_ascii(" if ")
self.append_expr(node.test, PRIORITY_TEST + 1)
self.append_ascii(" else ")
self.append_expr(node.orelse, PRIORITY_TEST)
def visit_List(self, node):
if node.elts is None:
self.append_ascii("[]")
return
self.append_ascii("[")
for i, elt in enumerate(node.elts):
if i > 0:
self.append_ascii(", ")
self.append_expr(elt)
self.append_ascii("]")
def visit_Tuple(self, node):
if node.elts is None:
self.append_ascii("()")
return
with self.maybe_parenthesize(PRIORITY_TUPLE):
for i, elt in enumerate(node.elts):
if i > 0:
self.append_ascii(", ")
self.append_expr(elt)
if len(node.elts) == 1:
self.append_ascii(",")
def visit_Set(self, node):
self.append_ascii("{")
for i, elt in enumerate(node.elts):
if i > 0:
self.append_ascii(", ")
self.append_expr(elt)
self.append_ascii("}")
def visit_Dict(self, node):
if node.keys is None:
self.append_ascii("{}")
return
self.append_ascii("{")
for i, key in enumerate(node.keys):
value = node.values[i]
if i > 0:
self.append_ascii(", ")
if key is not None:
self.append_expr(key)
self.append_ascii(": ")
self.append_expr(value)
else:
self.append_ascii("**")
self.append_expr(value)
self.append_ascii("}")
def append_generators(self, generators):
for generator in generators:
assert isinstance(generator, ast.comprehension)
if generator.is_async:
self.append_ascii(' async for ')
else:
self.append_ascii(' for ')
self.append_expr(generator.target, PRIORITY_TUPLE)
self.append_ascii(' in ')
self.append_expr(generator.iter, PRIORITY_TEST + 1)
if generator.ifs:
for if_ in generator.ifs:
self.append_ascii(' if ')
self.append_expr(if_, PRIORITY_TEST + 1)
def visit_ListComp(self, node):
self.append_ascii('[')
self.append_expr(node.elt)
self.append_generators(node.generators)
self.append_ascii(']')
def visit_GeneratorExp(self, node):
self.append_ascii('(')
self.append_expr(node.elt)
self.append_generators(node.generators)
self.append_ascii(')')
def visit_SetComp(self, node):
self.append_ascii('{')
self.append_expr(node.elt)
self.append_generators(node.generators)
self.append_ascii('}')
def visit_DictComp(self, node):
self.append_ascii('{')
self.append_expr(node.key)
self.append_ascii(': ')
self.append_expr(node.value)
self.append_generators(node.generators)
self.append_ascii('}')
def visit_Subscript(self, node):
self.append_expr(node.value, PRIORITY_ATOM)
self.append_ascii('[')
self.append_expr(node.slice, PRIORITY_TUPLE)
self.append_ascii(']')
def visit_Slice(self, node):
if node.lower:
self.append_expr(node.lower)
self.append_ascii(':')
if node.upper:
self.append_expr(node.upper)
if node.step:
self.append_ascii(':')
self.append_expr(node.step)
def visit_Attribute(self, node):
value = node.value
self.append_expr(value, PRIORITY_ATOM)
if isinstance(value, ast.Constant) and \
self.space.isinstance_w(value.value, self.space.w_int):
period = ' .'
else:
period = '.'
self.append_ascii(period)
self.append_utf8(node.attr)
def visit_Yield(self, node):
raise SyntaxError.fromast("'yield expression' can not be used within an annotation", node)
def visit_YieldFrom(self, node):
self.append_ascii("(yield from ")
self.append_expr(node.value)
self.append_ascii(")")
def visit_Call(self, node):
self.append_expr(node.func, PRIORITY_ATOM)
args = node.args
if (args and len(args) == 1
and not node.keywords
and isinstance(args[0], ast.GeneratorExp)):
self.append_expr(args[0])
return
self.append_ascii('(')
first = True
if args:
for i, arg in enumerate(args):
first = self.append_if_not_first(first, ', ')
self.append_expr(arg)
if node.keywords:
for i, keyword in enumerate(node.keywords):
first = self.append_if_not_first(first, ', ')
assert isinstance(keyword, ast.keyword)
if keyword.arg is None:
self.append_ascii('**')
else:
self.append_utf8(keyword.arg)
self.append_ascii('=')
self.append_expr(keyword.value)
self.append_ascii(')')
def visit_Starred(self, node):
self.append_ascii('*')
self.append_expr(node.value, PRIORITY_EXPR)
def visit_arg(self, node):
self.append_utf8(node.arg)
if node.annotation:
# is this reachable? don't think so!
self.append_ascii(': ')
self.append_expr(node.annotation)
def visit_Lambda(self, node):
with self.maybe_parenthesize(PRIORITY_TEST):
args = node.args
if not args.args and not args.vararg and not args.kwarg and not args.kwonlyargs:
self.append_ascii("lambda: ")
else:
self.append_ascii("lambda ")
first = True
if args.defaults:
default_count = len(args.defaults)
else:
default_count = 0
if args.args:
for i, arg in enumerate(args.args):
first = self.append_if_not_first(first, ', ')
di = i - (len(args.args) - default_count)
self.append_expr(arg)
if di >= 0:
self.append_ascii('=')
self.append_expr(args.defaults[di])
if args.vararg or args.kwonlyargs:
first = self.append_if_not_first(first, ', ')
self.append_ascii('*')
if args.vararg:
self.append_expr(args.vararg)
if args.kwonlyargs:
for i, arg in enumerate(args.kwonlyargs):
first = self.append_if_not_first(first, ', ')
di = i - (len(args.kwonlyargs) - default_count)
self.append_expr(arg)
default = args.kw_defaults[i]
if default:
self.append_ascii('=')
self.append_expr(default)
if args.kwarg:
first = self.append_if_not_first(first, ', ')
self.append_ascii('**')
self.append_expr(args.kwarg)
self.append_ascii(': ')
self.append_expr(node.body)
def visit_JoinedStr(self, node):
need_f = False
subvisitor = FstringVisitor(self.space)
for i, elt in enumerate(node.values):
if not isinstance(elt, ast.Constant):
need_f = True
elt.walkabout(subvisitor)
s = subvisitor.builder.build()
l = subvisitor.builder.getlength()
if need_f:
self.append_ascii("f")
self.append_w_str(self.space.repr(self.space.newutf8(s, l)))
def visit_Await(self, node):
with self.maybe_parenthesize(PRIORITY_AWAIT):
self.append_ascii("await ")
self.append_expr(node.value)
class FstringVisitor(Utf8BuilderVisitor):
def default_visitor(self, node):
raise OperationError(self.space.w_SystemError,
self.space.newtext("expression type not supported yet:" + str(node)))
def visit_Constant(self, node):
from rpython.rlib import rstring
s, l = self.space.utf8_len_w(node.value)
s = rstring.replace(s, "{", "{{")
s = rstring.replace(s, "}", "}}")
self.append_utf8(s)
def visit_FormattedValue(self, node):
outer_brace = "{"
s = unparse(self.space, node.value, PRIORITY_TEST + 1)
if s.startswith("{"):
outer_brace = "{ "
self.append_ascii(outer_brace)
self.append_utf8(s)
conversion = node.conversion
if conversion >= 0:
if conversion == ord('a'):
conversion = '!a'
elif conversion == ord('r'):
conversion = '!r'
elif conversion == ord('s'):
conversion = '!s'
else:
raise oefmt(self.space.w_SystemError,
"unknown f-string conversion kind %s", chr(conversion))
self.append_ascii(conversion)
if node.format_spec:
self.append_ascii(":")
node.format_spec.walkabout(self)
self.append_ascii("}")
def visit_JoinedStr(self, node):
for i, elt in enumerate(node.values):
elt.walkabout(self)
def unparse(space, ast, level=PRIORITY_TEST):
visitor = UnparseVisitor(space, level)
ast.walkabout(visitor)
return visitor.builder.build()
def w_unparse(space, ast, level=PRIORITY_TEST):
visitor = UnparseVisitor(space, level)
ast.walkabout(visitor)
return space.newutf8(visitor.builder.build(), visitor.builder.getlength())
class UnparseAnnotationsVisitor(ast.ASTVisitor):
def __init__(self, space):
self.space = space
@specialize.argtype(1)
def default_visitor(self, node):
return node
def unparse(self, node):
return ast.Constant(
w_unparse(self.space, node),
self.space.w_None,
node.lineno,
node.col_offset,
node.end_lineno,
node.end_col_offset)
def visit_arg(self, node):
annotation = node.annotation
if annotation:
node.annotation = self.unparse(annotation)
return node
def visit_FunctionDef(self, node):
returns = node.returns
if returns:
node.returns = self.unparse(returns)
return node
def visit_AsyncFunctionDef(self, node):
returns = node.returns
if returns:
node.returns = self.unparse(returns)
return node
def visit_AnnAssign(self, node):
node.annotation = self.unparse(node.annotation)
return node
def unparse_annotations(space, ast):
visitor = UnparseAnnotationsVisitor(space)
return ast.mutate_over(visitor)
|
