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import ast
import inspect
import textwrap
import tokenize
import warnings
from bisect import bisect_right
from typing import Iterable
from typing import Iterator
from typing import List
from typing import Optional
from typing import Tuple
from typing import Union
from _pytest.compat import overload
class Source:
"""An immutable object holding a source code fragment.
When using Source(...), the source lines are deindented.
"""
def __init__(self, obj: object = None) -> None:
if not obj:
self.lines = [] # type: List[str]
elif isinstance(obj, Source):
self.lines = obj.lines
elif isinstance(obj, (tuple, list)):
self.lines = deindent(x.rstrip("\n") for x in obj)
elif isinstance(obj, str):
self.lines = deindent(obj.split("\n"))
else:
rawcode = getrawcode(obj)
src = inspect.getsource(rawcode)
self.lines = deindent(src.split("\n"))
def __eq__(self, other: object) -> bool:
if not isinstance(other, Source):
return NotImplemented
return self.lines == other.lines
# Ignore type because of https://github.com/python/mypy/issues/4266.
__hash__ = None # type: ignore
@overload
def __getitem__(self, key: int) -> str:
raise NotImplementedError()
@overload # noqa: F811
def __getitem__(self, key: slice) -> "Source": # noqa: F811
raise NotImplementedError()
def __getitem__(self, key: Union[int, slice]) -> Union[str, "Source"]: # noqa: F811
if isinstance(key, int):
return self.lines[key]
else:
if key.step not in (None, 1):
raise IndexError("cannot slice a Source with a step")
newsource = Source()
newsource.lines = self.lines[key.start : key.stop]
return newsource
def __iter__(self) -> Iterator[str]:
return iter(self.lines)
def __len__(self) -> int:
return len(self.lines)
def strip(self) -> "Source":
""" return new source object with trailing
and leading blank lines removed.
"""
start, end = 0, len(self)
while start < end and not self.lines[start].strip():
start += 1
while end > start and not self.lines[end - 1].strip():
end -= 1
source = Source()
source.lines[:] = self.lines[start:end]
return source
def indent(self, indent: str = " " * 4) -> "Source":
""" return a copy of the source object with
all lines indented by the given indent-string.
"""
newsource = Source()
newsource.lines = [(indent + line) for line in self.lines]
return newsource
def getstatement(self, lineno: int) -> "Source":
""" return Source statement which contains the
given linenumber (counted from 0).
"""
start, end = self.getstatementrange(lineno)
return self[start:end]
def getstatementrange(self, lineno: int) -> Tuple[int, int]:
""" return (start, end) tuple which spans the minimal
statement region which containing the given lineno.
"""
if not (0 <= lineno < len(self)):
raise IndexError("lineno out of range")
ast, start, end = getstatementrange_ast(lineno, self)
return start, end
def deindent(self) -> "Source":
"""return a new source object deindented."""
newsource = Source()
newsource.lines[:] = deindent(self.lines)
return newsource
def __str__(self) -> str:
return "\n".join(self.lines)
#
# helper functions
#
def findsource(obj) -> Tuple[Optional[Source], int]:
try:
sourcelines, lineno = inspect.findsource(obj)
except Exception:
return None, -1
source = Source()
source.lines = [line.rstrip() for line in sourcelines]
return source, lineno
def getrawcode(obj, trycall: bool = True):
""" return code object for given function. """
try:
return obj.__code__
except AttributeError:
obj = getattr(obj, "f_code", obj)
obj = getattr(obj, "__code__", obj)
if trycall and not hasattr(obj, "co_firstlineno"):
if hasattr(obj, "__call__") and not inspect.isclass(obj):
x = getrawcode(obj.__call__, trycall=False)
if hasattr(x, "co_firstlineno"):
return x
return obj
def deindent(lines: Iterable[str]) -> List[str]:
return textwrap.dedent("\n".join(lines)).splitlines()
def get_statement_startend2(lineno: int, node: ast.AST) -> Tuple[int, Optional[int]]:
# flatten all statements and except handlers into one lineno-list
# AST's line numbers start indexing at 1
values = [] # type: List[int]
for x in ast.walk(node):
if isinstance(x, (ast.stmt, ast.ExceptHandler)):
values.append(x.lineno - 1)
for name in ("finalbody", "orelse"):
val = getattr(x, name, None) # type: Optional[List[ast.stmt]]
if val:
# treat the finally/orelse part as its own statement
values.append(val[0].lineno - 1 - 1)
values.sort()
insert_index = bisect_right(values, lineno)
start = values[insert_index - 1]
if insert_index >= len(values):
end = None
else:
end = values[insert_index]
return start, end
def getstatementrange_ast(
lineno: int,
source: Source,
assertion: bool = False,
astnode: Optional[ast.AST] = None,
) -> Tuple[ast.AST, int, int]:
if astnode is None:
content = str(source)
# See #4260:
# don't produce duplicate warnings when compiling source to find ast
with warnings.catch_warnings():
warnings.simplefilter("ignore")
astnode = ast.parse(content, "source", "exec")
start, end = get_statement_startend2(lineno, astnode)
# we need to correct the end:
# - ast-parsing strips comments
# - there might be empty lines
# - we might have lesser indented code blocks at the end
if end is None:
end = len(source.lines)
if end > start + 1:
# make sure we don't span differently indented code blocks
# by using the BlockFinder helper used which inspect.getsource() uses itself
block_finder = inspect.BlockFinder()
# if we start with an indented line, put blockfinder to "started" mode
block_finder.started = source.lines[start][0].isspace()
it = ((x + "\n") for x in source.lines[start:end])
try:
for tok in tokenize.generate_tokens(lambda: next(it)):
block_finder.tokeneater(*tok)
except (inspect.EndOfBlock, IndentationError):
end = block_finder.last + start
except Exception:
pass
# the end might still point to a comment or empty line, correct it
while end:
line = source.lines[end - 1].lstrip()
if line.startswith("#") or not line:
end -= 1
else:
break
return astnode, start, end
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