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235 lines
8.3 KiB
Python
235 lines
8.3 KiB
Python
import inspect
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import sys
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import traceback
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from types import FrameType, TracebackType
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from typing import Union, Iterable
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from stack_data import (style_with_executing_node, Options, Line, FrameInfo, LINE_GAP,
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Variable, RepeatedFrames, BlankLineRange, BlankLines)
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from stack_data.utils import assert_
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class Formatter:
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def __init__(
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self, *,
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options=None,
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pygmented=False,
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show_executing_node=True,
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pygments_formatter_cls=None,
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pygments_formatter_kwargs=None,
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pygments_style="monokai",
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executing_node_modifier="bg:#005080",
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executing_node_underline="^",
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current_line_indicator="-->",
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line_gap_string="(...)",
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line_number_gap_string=":",
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line_number_format_string="{:4} | ",
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show_variables=False,
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use_code_qualname=True,
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show_linenos=True,
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strip_leading_indent=True,
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html=False,
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chain=True,
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collapse_repeated_frames=True
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):
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if options is None:
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options = Options()
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if pygmented and not options.pygments_formatter:
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if show_executing_node:
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pygments_style = style_with_executing_node(
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pygments_style, executing_node_modifier
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)
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if pygments_formatter_cls is None:
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from pygments.formatters.terminal256 import Terminal256Formatter \
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as pygments_formatter_cls
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options.pygments_formatter = pygments_formatter_cls(
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style=pygments_style,
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**pygments_formatter_kwargs or {},
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)
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self.pygmented = pygmented
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self.show_executing_node = show_executing_node
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assert_(
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len(executing_node_underline) == 1,
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ValueError("executing_node_underline must be a single character"),
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)
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self.executing_node_underline = executing_node_underline
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self.current_line_indicator = current_line_indicator or ""
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self.line_gap_string = line_gap_string
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self.line_number_gap_string = line_number_gap_string
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self.line_number_format_string = line_number_format_string
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self.show_variables = show_variables
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self.show_linenos = show_linenos
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self.use_code_qualname = use_code_qualname
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self.strip_leading_indent = strip_leading_indent
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self.html = html
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self.chain = chain
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self.options = options
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self.collapse_repeated_frames = collapse_repeated_frames
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if not self.show_linenos and self.options.blank_lines == BlankLines.SINGLE:
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raise ValueError(
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"BlankLines.SINGLE option can only be used when show_linenos=True"
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)
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def set_hook(self):
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def excepthook(_etype, evalue, _tb):
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self.print_exception(evalue)
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sys.excepthook = excepthook
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def print_exception(self, e=None, *, file=None):
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self.print_lines(self.format_exception(e), file=file)
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def print_stack(self, frame_or_tb=None, *, file=None):
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if frame_or_tb is None:
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frame_or_tb = inspect.currentframe().f_back
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self.print_lines(self.format_stack(frame_or_tb), file=file)
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def print_lines(self, lines, *, file=None):
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if file is None:
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file = sys.stderr
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for line in lines:
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print(line, file=file, end="")
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def format_exception(self, e=None) -> Iterable[str]:
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if e is None:
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e = sys.exc_info()[1]
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if self.chain:
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if e.__cause__ is not None:
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yield from self.format_exception(e.__cause__)
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yield traceback._cause_message
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elif (e.__context__ is not None
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and not e.__suppress_context__):
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yield from self.format_exception(e.__context__)
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yield traceback._context_message
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yield 'Traceback (most recent call last):\n'
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yield from self.format_stack(e.__traceback__)
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yield from traceback.format_exception_only(type(e), e)
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def format_stack(self, frame_or_tb=None) -> Iterable[str]:
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if frame_or_tb is None:
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frame_or_tb = inspect.currentframe().f_back
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yield from self.format_stack_data(
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FrameInfo.stack_data(
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frame_or_tb,
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self.options,
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collapse_repeated_frames=self.collapse_repeated_frames,
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)
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)
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def format_stack_data(
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self, stack: Iterable[Union[FrameInfo, RepeatedFrames]]
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) -> Iterable[str]:
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for item in stack:
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if isinstance(item, FrameInfo):
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yield from self.format_frame(item)
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else:
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yield self.format_repeated_frames(item)
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def format_repeated_frames(self, repeated_frames: RepeatedFrames) -> str:
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return ' [... skipping similar frames: {}]\n'.format(
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repeated_frames.description
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)
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def format_frame(self, frame: Union[FrameInfo, FrameType, TracebackType]) -> Iterable[str]:
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if not isinstance(frame, FrameInfo):
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frame = FrameInfo(frame, self.options)
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yield self.format_frame_header(frame)
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for line in frame.lines:
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if isinstance(line, Line):
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yield self.format_line(line)
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elif isinstance(line, BlankLineRange):
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yield self.format_blank_lines_linenumbers(line)
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else:
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assert_(line is LINE_GAP)
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yield self.line_gap_string + "\n"
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if self.show_variables:
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try:
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yield from self.format_variables(frame)
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except Exception:
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pass
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def format_frame_header(self, frame_info: FrameInfo) -> str:
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return ' File "{frame_info.filename}", line {frame_info.lineno}, in {name}\n'.format(
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frame_info=frame_info,
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name=(
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frame_info.executing.code_qualname()
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if self.use_code_qualname else
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frame_info.code.co_name
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),
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)
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def format_line(self, line: Line) -> str:
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result = ""
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if self.current_line_indicator:
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if line.is_current:
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result = self.current_line_indicator
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else:
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result = " " * len(self.current_line_indicator)
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result += " "
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else:
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result = " "
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if self.show_linenos:
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result += self.line_number_format_string.format(line.lineno)
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prefix = result
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result += line.render(
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pygmented=self.pygmented,
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escape_html=self.html,
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strip_leading_indent=self.strip_leading_indent,
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) + "\n"
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if self.show_executing_node and not self.pygmented:
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for line_range in line.executing_node_ranges:
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start = line_range.start - line.leading_indent
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end = line_range.end - line.leading_indent
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# if end <= start, we have an empty line inside a highlighted
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# block of code. In this case, we need to avoid inserting
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# an extra blank line with no markers present.
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if end > start:
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result += (
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" " * (start + len(prefix))
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+ self.executing_node_underline * (end - start)
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+ "\n"
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)
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return result
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def format_blank_lines_linenumbers(self, blank_line):
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if self.current_line_indicator:
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result = " " * len(self.current_line_indicator) + " "
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else:
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result = " "
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if blank_line.begin_lineno == blank_line.end_lineno:
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return result + self.line_number_format_string.format(blank_line.begin_lineno) + "\n"
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return result + " {}\n".format(self.line_number_gap_string)
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def format_variables(self, frame_info: FrameInfo) -> Iterable[str]:
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for var in sorted(frame_info.variables, key=lambda v: v.name):
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try:
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yield self.format_variable(var) + "\n"
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except Exception:
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pass
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def format_variable(self, var: Variable) -> str:
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return "{} = {}".format(
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var.name,
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self.format_variable_value(var.value),
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)
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def format_variable_value(self, value) -> str:
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return repr(value)
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