demjson.py 文件源码

def pretty_description(self, show_positions=True, filename=None):
        if filename:
            pfx = filename.rstrip().rstrip(':') + ':'
        else:
            pfx = ''
        # Print file position as numeric abbreviation
        err = pfx
        if self.position == 0:
            err += '0:0:'
        elif self.position:
            err += '%d:%d:' % (self.position.line, self.position.column)
        else:
            err += '    '
        # Print severity and main error message
        err += " %s: %s" % (self.severity.capitalize(), self.message)
        if len(self.args) > 1:
            err += ': '
            for anum, a in enumerate(self.args[1:]):
                if anum > 1:
                    err += ', '
                astr = repr(a)
                if len(astr) > 30:
                    astr = astr[:30] + '...'
                err += astr
        # Print out exception chain
        e2 = self
        while e2:
            if hasattr(e2,'__cause__') and isinstance(e2.__cause__,Exception):
                e2 = e2.__cause__
                e2desc = str(e2).strip()
                if not e2desc:
                    e2desc = repr(e2).strip()
                err += "\n   |  Cause: %s" % e2desc.strip().replace('\n','\n   |         ')
            else:
                e2 = None
        # Show file position
        if show_positions and self.position is not None:
            if self.position == 0:
                err += "\n   |  At start of input"
            else:
                err += "\n   |  At %s" % (self.position.describe(show_text=False),)
                if self.position.text_after:
                    err += "\n   |    near text: %r" % (self.position.text_after,)
        # Show context
        if show_positions and self.outer_position:
            if self.context_description:
                cdesc = self.context_description.capitalize()
            else:
                cdesc = "Context"
            err += "\n   |  %s started at %s" % (cdesc, self.outer_position.describe(show_text=False),)
            if self.outer_position.text_after:
                err += "\n   |    with text: %r" % (self.outer_position.text_after,)
        return err