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103 lines
3.1 KiB
Python
103 lines
3.1 KiB
Python
# errors.py
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#
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# Copyright 2021 James Westman <james@jwestman.net>
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#
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# This file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 3 of the
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# License, or (at your option) any later version.
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#
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# This file is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# SPDX-License-Identifier: LGPL-3.0-or-later
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import sys, traceback
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class _colors:
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RED = '\033[91m'
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YELLOW = '\033[33m'
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FAINT = '\033[2m'
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BOLD = '\033[1m'
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CLEAR = '\033[0m'
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class PrintableError(Exception):
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""" Parent class for errors that can be pretty-printed for the user, e.g.
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compilation warnings and errors. """
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def pretty_print(self, filename, code):
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raise NotImplementedError()
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class CompileError(PrintableError):
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category = "error"
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def __init__(self, message, start, end=None):
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super().__init__(message)
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self.message = message
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self.start = start
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self.end = end
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def pretty_print(self, filename, code):
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sp = code[:self.start+1].splitlines(keepends=True)
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line_num = len(sp)
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col_num = len(sp[-1])
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line = code.splitlines(True)[line_num-1]
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print(f"""{_colors.RED}{_colors.BOLD}{self.category}: {self.message}{_colors.CLEAR}
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at {filename} line {line_num} column {col_num}:
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{_colors.FAINT}{line_num :>4} |{_colors.CLEAR} {line} {_colors.FAINT}|{" "*(col_num)}^{_colors.CLEAR}
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""")
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class TokenizeError(CompileError):
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def __init__(self, start):
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super().__init__("Could not determine what kind of syntax is meant here", start)
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class ParseError(CompileError):
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pass
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class MultipleErrors(PrintableError):
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""" If multiple errors occur during compilation, they can be collected into
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a list and re-thrown using the MultipleErrors exception. It will
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pretty-print all of the errors and a count of how many errors there are. """
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def __init__(self, errors: [CompileError]):
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super().__init__()
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self.errors = errors
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def pretty_print(self, filename, code) -> str:
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for error in self.errors:
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error.pretty_print(filename, code)
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if len(self.errors) != 1:
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print(f"{len(self.errors)} errors")
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class CompilerBugError(Exception):
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""" Emitted on assertion errors """
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def assert_true(truth: bool, message:str=None):
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if not truth:
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raise CompilerBugError(message)
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def report_compile_error():
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""" Report an error and ask people to report it. """
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print(traceback.format_exc())
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print(f"Arguments: {sys.argv}\n")
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print(f"""{_colors.BOLD}{_colors.RED}***** COMPILER BUG *****
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The gtk-blueprint-tool program has crashed. Please report the above stacktrace
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to the maintainers, along with the input file(s) if possible.{_colors.CLEAR}""")
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