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OutputHandling.py
import types import weakref # To restore the old-style class behavior that __getattr__ also affects special # methods. class _AttrProxy: _oh_proxied_classes = weakref.WeakSet({type, object}) # Don'r rely on _oh_add_proxy_attr to prime us, some clients use # setup_printing to setup __repr__ function. def __repr__(self): return self.__getattr__('__repr__')() @classmethod def _oh_add_proxy_attr(cls, attr): if not attr.startswith('__') or not attr.endswith('__'): return for scls in cls.__mro__: if scls is object: break if attr in scls.__dict__: return if attr in ('__new__', '__init__', '__getattr__', '__getattribute__', '__setattr__', '__delattr__', '__str__', ): return def closure(attr): def generated_function(self, *args, **kwds): func = self.__getattr__(attr) return func(*args, **kwds) return generated_function setattr(cls, attr, closure(attr)) @classmethod def _oh_add_proxy_class(cls, base): if base in cls._oh_proxied_classes: return for scls in base.__mro__: cls._oh_proxied_classes.add(scls) for attr, val in scls.__dict__.items(): if not isinstance(val, types.FunctionType): continue cls._oh_add_proxy_attr(attr) class OutputHandler: def __init__(self, mod, output_file): self.mod = mod self.output_file = output_file class OutputBuffer: def __init__(self, mod, opts=None): self.mod = mod self.strio = mod._root.io.StringIO() if opts is None: opts = {} self.opts = opts self.lines = [''] self.line_no = 0 def getopt(self, opt): return self.opts.get(opt) def getvalue(self): return '\n'.join(self.lines) def new_line(self): self.line_no += 1 self.lines.append('') def write(self, s): lines = s.split('\n') for line in lines[:-1]: self.write_seg(line) self.new_line() self.write_seg(lines[-1]) def write_seg(self, s): self.lines[self.line_no] += s class AllPrinter(_AttrProxy): _oh_next_lineno = None def __init__(self, printer): self._oh_printer = printer self._hiding_tag_ = printer._hiding_tag_ def __getattr__(self, attr): return self._oh_printer.getattr(self, attr) def __repr__(self): return self._oh_printer.get_str(self, True) def _oh_get_next_lineno(self): return 0 def _oh_get_start_lineno(self): return 0 def _oh_get_max_lines(self, max_lines): return None class MorePrinter(_AttrProxy): _oh_next_lineno = None def __init__(self, printer, previous): self._oh_printer = printer self._oh_previous = previous self._hiding_tag_ = printer._hiding_tag_ def __getattr__(self, attr): return self._oh_printer.getattr(self, attr) def _oh_get_next_lineno(self): next_lineno = self._oh_next_lineno if next_lineno is None: repr(self) next_lineno = self._oh_next_lineno return next_lineno def _oh_get_start_lineno(self): return self._oh_previous._oh_get_next_lineno() def _oh_get_max_lines(self, max_lines): return max_lines class Printer: def __init__(self, mod, client, handler, get_line_iter=None, max_more_lines=None, get_num_lines=None, get_label=None, get_row_header=None, get_more_msg=None, get_more_state_msg=None, get_empty_msg=None, stop_only_when_told=None ): try: handler = handler.printer.handler except AttributeError: pass if get_line_iter is None: get_line_iter = handler._oh_get_line_iter if max_more_lines is None: max_more_lines = mod.max_more_lines self.mod = mod self._hiding_tag_ = mod._hiding_tag_ self.client = client self.handler = handler self.get_line_iter = get_line_iter self.max_more_lines = max_more_lines if get_num_lines is None: get_num_lines = getattr( handler, '_oh_get_num_lines', None) if get_num_lines is not None: self.get_num_lines = get_num_lines if get_label is None: get_label = getattr( handler, '_oh_get_label', None) if get_label is not None: self.get_label = get_label if get_row_header is None: get_row_header = getattr( handler, '_oh_get_row_header', None) if get_row_header is not None: self.get_row_header = get_row_header if get_more_msg is None: get_more_msg = getattr( handler, '_oh_get_more_msg', None) if get_more_msg is not None: self.get_more_msg = get_more_msg if get_more_state_msg is None: get_more_state_msg = getattr( handler, '_oh_get_more_state_msg', None) if get_more_state_msg is not None: self.get_more_state_msg = get_more_state_msg if get_empty_msg is None: get_empty_msg = getattr( handler, '_oh_get_empty_msg', None) if get_empty_msg is not None: self.get_empty_msg = get_empty_msg self.stop_only_when_told = stop_only_when_told self.reset() def getattr(self, mp, attr): try: g = getattr(self, '_get_'+attr) except AttributeError: return getattr(self.client, attr) else: return g(mp) def line_at(self, idx): while idx >= len(self.lines_seen): try: li = next(self.line_iter) except StopIteration: raise IndexError else: if isinstance(li, tuple): cmd, line = li if cmd == 'STOP_AFTER': self.stop_linenos[len(self.lines_seen)] = 1 else: line = li self.lines_seen.append(line) return self.lines_seen[idx] def lines_from(self, idx=0): line_iter = self.line_iter if line_iter is None: line_iter = self.line_iter = self.get_line_iter() while 1: try: yield self.line_at(idx) except IndexError: return idx += 1 def _get_more(self, mp): return MorePrinter(self, mp) def _get_all(self, mp): return AllPrinter(self) def _oh_get_next_lineno(self): next_lineno = getattr(self, '_oh_next_lineno', None) if next_lineno is None: self.get_str_of_top() next_lineno = self._oh_next_lineno return next_lineno def _get_prev(self, mp): return mp._oh_previous def _oh_get_start_lineno(self): return 0 def _oh_get_max_lines(self, max_lines): return max_lines def _get_top(self, mp): return self.client def _get___repr__(self, mp): return lambda: self.get_str(mp, False) def get_label(self): return None def get_row_header(self): return None def get_str_of_top(self): return self.get_str(self, True) def get_more_state_msg(self, start_lineno, end_lineno): num_lines = self.get_num_lines() if num_lines is None: of_num_lines = '' else: of_num_lines = ' of %d' % num_lines return "Lines %d..%d%s. " % (start_lineno, end_lineno, of_num_lines) def get_more_msg(self, start_lineno, end_lineno): state_msg = self.get_more_state_msg(start_lineno, end_lineno) return "<%sType e.g. '_.more' for more.>" % (state_msg) def get_empty_msg(self): return None def get_num_lines(self): return None def get_str(self, printer, is_top): def f(): _hiding_tag_ = printer._hiding_tag_ start_lineno = printer._oh_get_start_lineno() m_max_lines = printer._oh_get_max_lines(self.max_more_lines) ob = self.mod.output_buffer() it = self.lines_from(start_lineno) if is_top: msg = self.get_label() if msg is not None: print(msg, file=ob) printer._oh_next_lineno = start_lineno try: nxt = next(it) except StopIteration: msg = self.get_empty_msg() if msg is not None: print(msg, file=ob) printer._oh_next_lineno = start_lineno else: msg = self.get_row_header() if msg is not None: print(msg, file=ob) it = self.mod.itertools.chain((nxt,), it) numlines = 0 lineno = start_lineno for line in it: if (m_max_lines is not None and numlines >= m_max_lines and ((not self.stop_only_when_told) or self.stop_linenos.get(lineno-1))): try: self.line_at(lineno+1) except IndexError: print(line, file=ob) lineno += 1 break else: print(self.get_more_msg(start_lineno, lineno-1), file=ob) break numlines += 1 print(line, file=ob) lineno += 1 printer._oh_next_lineno = lineno return ob.getvalue().rstrip() return self.mod.View.enter(lambda: f()) def reset(self): self.lines_seen = [] self.stop_linenos = {} self.line_iter = None class _GLUECLAMP_: _chgable_ = 'output_file', 'max_more_lines', _preload_ = ('_hiding_tag_',) _imports_ = ( '_parent:View', '_root:itertools', ) max_more_lines = 10 def _get__hiding_tag_(self): return self._parent.View._hiding_tag_ def _get_output_file(self): return self._root.sys.stdout def more_printer(self, client, handler=None, **kwds): if handler is None: handler = client printer = Printer(self, client, handler, **kwds) _AttrProxy._oh_add_proxy_class(client.__class__) return MorePrinter(printer, printer) def output_buffer(self): return OutputBuffer(self) def output_handler(self, output_file=None): if output_file is None: output_file = self.output_file return OutputHandler(self, output_file) def setup_printing(self, client, handler=None, **kwds): if handler is None: handler = client more = self.more_printer(client, handler, **kwds) printer = more._oh_printer client.more = more client.all = more.all client.printer = printer def reprfunc(self): return self.printer.get_str_of_top() # Don't recreate, messes with relheap, and this is not # under _hiding_tag_ cls = client.__class__ if '__repr__' not in cls.__dict__: cls.__repr__ = reprfunc def _get_stdout(self): return self._root.sys.stdout
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