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# exceptions.py import re import sys import typing from .util import ( col, line, lineno, _collapse_string_to_ranges, replaced_by_pep8, ) from .unicode import pyparsing_unicode as ppu class ExceptionWordUnicode(ppu.Latin1, ppu.LatinA, ppu.LatinB, ppu.Greek, ppu.Cyrillic): pass _extract_alphanums = _collapse_string_to_ranges(ExceptionWordUnicode.alphanums) _exception_word_extractor = re.compile("([" + _extract_alphanums + "]{1,16})|.") class ParseBaseException(Exception): """base exception class for all parsing runtime exceptions""" loc: int msg: str pstr: str parser_element: typing.Any # "ParserElement" args: typing.Tuple[str, int, typing.Optional[str]] __slots__ = ( "loc", "msg", "pstr", "parser_element", "args", ) # Performance tuning: we construct a *lot* of these, so keep this # constructor as small and fast as possible def __init__( self, pstr: str, loc: int = 0, msg: typing.Optional[str] = None, elem=None, ): self.loc = loc if msg is None: self.msg = pstr self.pstr = "" else: self.msg = msg self.pstr = pstr self.parser_element = elem self.args = (pstr, loc, msg) @staticmethod def explain_exception(exc, depth=16): """ Method to take an exception and translate the Python internal traceback into a list of the pyparsing expressions that caused the exception to be raised. Parameters: - exc - exception raised during parsing (need not be a ParseException, in support of Python exceptions that might be raised in a parse action) - depth (default=16) - number of levels back in the stack trace to list expression and function names; if None, the full stack trace names will be listed; if 0, only the failing input line, marker, and exception string will be shown Returns a multi-line string listing the ParserElements and/or function names in the exception's stack trace. """ import inspect from .core import ParserElement if depth is None: depth = sys.getrecursionlimit() ret = [] if isinstance(exc, ParseBaseException): ret.append(exc.line) ret.append(" " * (exc.column - 1) + "^") ret.append(f"{type(exc).__name__}: {exc}") if depth > 0: callers = inspect.getinnerframes(exc.__traceback__, context=depth) seen = set() for i, ff in enumerate(callers[-depth:]): frm = ff[0] f_self = frm.f_locals.get("self", None) if isinstance(f_self, ParserElement): if not frm.f_code.co_name.startswith( ("parseImpl", "_parseNoCache") ): continue if id(f_self) in seen: continue seen.add(id(f_self)) self_type = type(f_self) ret.append( f"{self_type.__module__}.{self_type.__name__} - {f_self}" ) elif f_self is not None: self_type = type(f_self) ret.append(f"{self_type.__module__}.{self_type.__name__}") else: code = frm.f_code if code.co_name in ("wrapper", "<module>"): continue ret.append(code.co_name) depth -= 1 if not depth: break return "\n".join(ret) @classmethod def _from_exception(cls, pe): """ internal factory method to simplify creating one type of ParseException from another - avoids having __init__ signature conflicts among subclasses """ return cls(pe.pstr, pe.loc, pe.msg, pe.parser_element) @property def line(self) -> str: """ Return the line of text where the exception occurred. """ return line(self.loc, self.pstr) @property def lineno(self) -> int: """ Return the 1-based line number of text where the exception occurred. """ return lineno(self.loc, self.pstr) @property def col(self) -> int: """ Return the 1-based column on the line of text where the exception occurred. """ return col(self.loc, self.pstr) @property def column(self) -> int: """ Return the 1-based column on the line of text where the exception occurred. """ return col(self.loc, self.pstr) # pre-PEP8 compatibility @property def parserElement(self): return self.parser_element @parserElement.setter def parserElement(self, elem): self.parser_element = elem def __str__(self) -> str: if self.pstr: if self.loc >= len(self.pstr): foundstr = ", found end of text" else: # pull out next word at error location found_match = _exception_word_extractor.match(self.pstr, self.loc) if found_match is not None: found = found_match.group(0) else: found = self.pstr[self.loc : self.loc + 1] foundstr = (", found %r" % found).replace(r"\\", "\\") else: foundstr = "" return f"{self.msg}{foundstr} (at char {self.loc}), (line:{self.lineno}, col:{self.column})" def __repr__(self): return str(self) def mark_input_line( self, marker_string: typing.Optional[str] = None, *, markerString: str = ">!<" ) -> str: """ Extracts the exception line from the input string, and marks the location of the exception with a special symbol. """ markerString = marker_string if marker_string is not None else markerString line_str = self.line line_column = self.column - 1 if markerString: line_str = "".join( (line_str[:line_column], markerString, line_str[line_column:]) ) return line_str.strip() def explain(self, depth=16) -> str: """ Method to translate the Python internal traceback into a list of the pyparsing expressions that caused the exception to be raised. Parameters: - depth (default=16) - number of levels back in the stack trace to list expression and function names; if None, the full stack trace names will be listed; if 0, only the failing input line, marker, and exception string will be shown Returns a multi-line string listing the ParserElements and/or function names in the exception's stack trace. Example:: expr = pp.Word(pp.nums) * 3 try: expr.parse_string("123 456 A789") except pp.ParseException as pe: print(pe.explain(depth=0)) prints:: 123 456 A789 ^ ParseException: Expected W:(0-9), found 'A' (at char 8), (line:1, col:9) Note: the diagnostic output will include string representations of the expressions that failed to parse. These representations will be more helpful if you use `set_name` to give identifiable names to your expressions. Otherwise they will use the default string forms, which may be cryptic to read. Note: pyparsing's default truncation of exception tracebacks may also truncate the stack of expressions that are displayed in the ``explain`` output. To get the full listing of parser expressions, you may have to set ``ParserElement.verbose_stacktrace = True`` """ return self.explain_exception(self, depth) # fmt: off @replaced_by_pep8(mark_input_line) def markInputline(self): ... # fmt: on class ParseException(ParseBaseException): """ Exception thrown when a parse expression doesn't match the input string Example:: try: Word(nums).set_name("integer").parse_string("ABC") except ParseException as pe: print(pe) print("column: {}".format(pe.column)) prints:: Expected integer (at char 0), (line:1, col:1) column: 1 """ class ParseFatalException(ParseBaseException): """ User-throwable exception thrown when inconsistent parse content is found; stops all parsing immediately """ class ParseSyntaxException(ParseFatalException): """ Just like :class:`ParseFatalException`, but thrown internally when an :class:`ErrorStop<And._ErrorStop>` ('-' operator) indicates that parsing is to stop immediately because an unbacktrackable syntax error has been found. """ class RecursiveGrammarException(Exception): """ Exception thrown by :class:`ParserElement.validate` if the grammar could be left-recursive; parser may need to enable left recursion using :class:`ParserElement.enable_left_recursion<ParserElement.enable_left_recursion>` """ def __init__(self, parseElementList): self.parseElementTrace = parseElementList def __str__(self) -> str: return f"RecursiveGrammarException: {self.parseElementTrace}"