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How to use AlternatesWith method in autotest

Best Python code snippet using autotest_python
jsontemplate.py
Source:jsontemplate.py
...255      pred = self._GetPredicate(pred_str)256    else:257      pred = None258    self.current_block.NewOrClause(pred)259  def AlternatesWith(self):260    self.current_block.AlternatesWith()261  def NewPredicateSection(self, pred_str):262    """For chains of predicate clauses."""263    pred = self._GetPredicate(pred_str)264    block = _PredicateSection()265    block.NewOrClause(pred)266    self._NewSection(_DoPredicates, block)267  def EndSection(self):268    self.stack.pop()269    self.current_block = self.stack[-1]270  def Root(self):271    # It's assumed that we call this at the end of the program272    return self.current_block273class _AbstractSection(object):274  def __init__(self):275    # Pairs of func, args, or a literal string276    self.current_clause = []277  def Append(self, statement):278    """Append a statement to this block."""279    self.current_clause.append(statement)280  def AlternatesWith(self):281    raise TemplateSyntaxError(282        '{.alternates with} can only appear with in {.repeated section ...}')283  def NewOrClause(self):284    raise NotImplementedError285class _Section(_AbstractSection):286  """Represents a (repeated) section."""287  def __init__(self, section_name=None):288    """289    Args:290      section_name: name given as an argument to the section291      token_type: The token type that created this section (e.g.292          PREDICATE_TOKEN)293    """294    _AbstractSection.__init__(self)295    self.section_name = section_name296    # Clauses is just a string and a list of statements.297    self.statements = {'default': self.current_clause}298  def __repr__(self):299    return '<Section %s>' % self.section_name300  def Statements(self, clause='default'):301    return self.statements.get(clause, [])302  def NewOrClause(self, pred):303    if pred:304      raise TemplateSyntaxError(305          '{.or} clause only takes a predicate inside predicate blocks')306    self.current_clause = []307    self.statements['or'] = self.current_clause308class _RepeatedSection(_Section):309  """Repeated section is like section, but it supports {.alternates with}"""310  def AlternatesWith(self):311    self.current_clause = []312    self.statements['alternates with'] = self.current_clause313class _PredicateSection(_AbstractSection):314  """Represents a sequence of predicate clauses."""315  def __init__(self):316    _AbstractSection.__init__(self)317    # List of func, statements318    self.clauses = []319  def NewOrClause(self, pred):320    # {.or} always executes if reached321    pred = pred or (lambda x: True, None, SIMPLE_FUNC)  # 3-tuple322    self.current_clause = []323    self.clauses.append((pred, self.current_clause))324class _Frame(object):325  """A stack frame."""326  def __init__(self, context, index=-1):327    # Public attributes328    self.context = context329    self.index = index   # An iteration index.  -1 means we're NOT iterating.330  def __str__(self):331    return 'Frame %s (%s)' % (self.context, self.index)332class _ScopedContext(object):333  """Allows scoped lookup of variables.334  If the variable isn't in the current context, then we search up the stack.335  """336  def __init__(self, context, undefined_str):337    """338    Args:339      context: The root context340      undefined_str: See Template() constructor.341    """342    self.stack = [_Frame(context)]343    self.undefined_str = undefined_str344  def PushSection(self, name):345    """Given a section name, push it on the top of the stack.346    Returns:347      The new section, or None if there is no such section.348    """349    if name == '@':350      new_context = self.stack[-1].context351    else:352      new_context = self.stack[-1].context.get(name)353    self.stack.append(_Frame(new_context))354    return new_context355  def Pop(self):356    self.stack.pop()357  def Next(self):358    """Advance to the next item in a repeated section.359    Raises:360      StopIteration if there are no more elements361    """362    stacktop = self.stack[-1]363    # Now we're iterating -- push a new mutable object onto the stack364    if stacktop.index == -1:365      stacktop = _Frame(None, index=0)366      self.stack.append(stacktop)367    context_array = self.stack[-2].context368    if stacktop.index == len(context_array):369      self.stack.pop()370      raise StopIteration371    stacktop.context = context_array[stacktop.index]372    stacktop.index += 1373    return True  # OK, we mutated the stack374  def _Undefined(self, name):375    if self.undefined_str is None:376      raise UndefinedVariable('%r is not defined' % name)377    else:378      return self.undefined_str379  def _LookUpStack(self, name):380    """Look up the stack for the given name."""381    i = len(self.stack) - 1382    while 1:383      frame = self.stack[i]384      if name == '@index':385        if frame.index != -1:  # -1 is undefined386          return frame.index  # @index is 1-based387      else:388        context = frame.context389        if hasattr(context, 'get'):  # Can't look up names in a list or atom390          try:391            return context[name]392          except KeyError:393            pass394      i -= 1  # Next frame395      if i <= -1:  # Couldn't find it anywhere396        return self._Undefined(name)397  def Lookup(self, name):398    """Get the value associated with a name in the current context.399    The current context could be an dictionary in a list, or a dictionary400    outside a list.401    Args:402      name: name to lookup, e.g. 'foo' or 'foo.bar.baz'403    Returns:404      The value, or self.undefined_str405    Raises:406      UndefinedVariable if self.undefined_str is not set407    """408    if name == '@':409      return self.stack[-1].context410    parts = name.split('.')411    value = self._LookUpStack(parts[0])412    # Now do simple lookups of the rest of the parts413    for part in parts[1:]:414      try:415        value = value[part]416      except (KeyError, TypeError):  # TypeError for non-dictionaries417        return self._Undefined(part)418    return value419def _ToString(x):420  # Some cross-language values for primitives421  if x is None:422    return 'null'423  if isinstance(x, basestring):424    return x425  return pprint.pformat(x)426def _HtmlAttrValue(x):427  return cgi.escape(x, quote=True)428def _AbsUrl(relative_url, context, unused_args):429  """Returns an absolute URL, given the current node as a relative URL.430  Assumes that the context has a value named 'base-url'.  This is a little like431  the HTML <base> tag, but implemented with HTML generation.432  Raises:433    UndefinedVariable if 'base-url' doesn't exist434  """435  # urljoin is flexible about trailing/leading slashes -- it will add or de-dupe436  # them437  return urlparse.urljoin(context.Lookup('base-url'), relative_url)438# See http://google-ctemplate.googlecode.com/svn/trunk/doc/howto.html for more439# escape types.440#441# Also, we might want to take a look at Django filters.442#443# This is a *public* constant, so that callers can use it construct their own444# formatter lookup dictionaries, and pass them in to Template.445_DEFAULT_FORMATTERS = {446    'html': cgi.escape,447    # The 'htmltag' name is deprecated.  The html-attr-value name is preferred448    # because it can be read with "as":449    #   {url|html-attr-value} means:450    #   "substitute 'url' as an HTML attribute value"451    'html-attr-value': _HtmlAttrValue,452    'htmltag': _HtmlAttrValue,453    'raw': lambda x: x,454    # Used for the length of a list.  Can be used for the size of a dictionary455    # too, though I haven't run into that use case.456    'size': lambda value: str(len(value)),457    # The argument is a dictionary, and we get a a=1&b=2 string back.458    'url-params': urlencode,459    # The argument is an atom, and it takes 'Search query?' -> 'Search+query%3F'460    'url-param-value': quote_plus,  # param is an atom461    # The default formatter, when no other default is specifier.  For debugging,462    # this could be lambda x: json.dumps(x, indent=2), but here we want to be463    # compatible to Python 2.4.464    'str': _ToString,465    # Just show a plain URL on an HTML page (without anchor text).466    'plain-url': lambda x: '<a href="%s">%s</a>' % (467        cgi.escape(x, quote=True), cgi.escape(x)),468    # A context formatter469    'AbsUrl': _AbsUrl,470    # Placeholders for "standard names".  We're not including them by default471    # since they require additional dependencies.  We can provide a part of the472    # "lookup chain" in formatters.py for people people want the dependency.473    # 'json' formats arbitrary data dictionary nodes as JSON strings.  'json'474    # and 'js-string' are identical (since a JavaScript string *is* JSON).  The475    # latter is meant to be serve as extra documentation when you want a string476    # argument only, which is a common case.477    'json': None,478    'js-string': None,479    }480def _Pluralize(value, unused_context, args):481  """Formatter to pluralize words."""482  if len(args) == 0:483    s, p = '', 's'484  elif len(args) == 1:485    s, p = '', args[0]486  elif len(args) == 2:487    s, p = args488  else:489    # Should have been checked at compile time490    raise AssertionError491  if value > 1:492    return p493  else:494    return s495def _Cycle(value, unused_context, args):496  """Cycle between various values on consecutive integers."""497  # @index starts from 1, so used 1-based indexing498  return args[(value - 1) % len(args)]499def _IsDebugMode(unused_value, context, unused_args):500  try:501    return bool(context.Lookup('debug'))502  except UndefinedVariable:503    return False504_DEFAULT_PREDICATES = {505    'singular?': lambda x: x == 1,506    'plural?': lambda x: x > 1,507    'Debug?': _IsDebugMode,508    }509def SplitMeta(meta):510  """Split and validate metacharacters.511  Example: '{}' -> ('{', '}')512  This is public so the syntax highlighter and other tools can use it.513  """514  n = len(meta)515  if n % 2 == 1:516    raise ConfigurationError(517        '%r has an odd number of metacharacters' % meta)518  return meta[:n//2], meta[n//2:]519_token_re_cache = {}520def MakeTokenRegex(meta_left, meta_right):521  """Return a (compiled) regular expression for tokenization.522  Args:523    meta_left, meta_right: e.g. '{' and '}'524  - The regular expressions are memoized.525  - This function is public so the syntax highlighter can use it.526  """527  key = meta_left, meta_right528  if key not in _token_re_cache:529    # - Need () grouping for re.split530    # - For simplicity, we allow all characters except newlines inside531    #   metacharacters ({} / [])532    _token_re_cache[key] = re.compile(533        r'(' +534        re.escape(meta_left) +535        r'.+?' +536        re.escape(meta_right) +537        r')')538  return _token_re_cache[key]539# Examples:540( LITERAL_TOKEN,  # "Hi"541  SUBSTITUTION_TOKEN,  # {var|html}542  SECTION_TOKEN,  # {.section name}543  REPEATED_SECTION_TOKEN,  # {.repeated section name}544  PREDICATE_TOKEN,  # {.predicate?}545  ALTERNATES_TOKEN,  # {.or}546  OR_TOKEN,  # {.or}547  END_TOKEN,  # {.end}548  ) = list(range(8))549def _MatchDirective(token):550  """Helper function for matching certain directives."""551  if token.startswith('.'):552    token = token[1:]553  else:554    return None, None  # Must start with .555  if token == 'alternates with':556    return ALTERNATES_TOKEN, token557  if token.startswith('or'):558    if token.strip() == 'or':559      return OR_TOKEN, None560    else:561      pred_str = token[2:].strip()562      return OR_TOKEN, pred_str563  if token == 'end':564    return END_TOKEN, None565  match = _SECTION_RE.match(token)566  if match:567    repeated, section_name = match.groups()568    if repeated:569      return REPEATED_SECTION_TOKEN, section_name570    else:571      return SECTION_TOKEN, section_name572  # {.if plural?} and {.plural?} are synonyms.  The ".if" will read better for573  # expressions, for people who like that kind of dirty thing...574  if token.startswith('if '):575    return PREDICATE_TOKEN, token[3:].strip()576  if token.endswith('?'):577    return PREDICATE_TOKEN, token578  return None, None  # no match579def _Tokenize(template_str, meta_left, meta_right):580  """Yields tokens, which are 2-tuples (TOKEN_TYPE, token_string)."""581  trimlen = len(meta_left)582  token_re = MakeTokenRegex(meta_left, meta_right)583  for line in template_str.splitlines(True):  # retain newlines584    tokens = token_re.split(line)585    # Check for a special case first.  If a comment or "block" directive is on a586    # line by itself (with only space surrounding it), then the space is587    # omitted.  For simplicity, we don't handle the case where we have 2588    # directives, say '{.end} # {#comment}' on a line.589    if len(tokens) == 3:590      # ''.isspace() == False, so work around that591      if (tokens[0].isspace() or not tokens[0]) and \592         (tokens[2].isspace() or not tokens[2]):593        token = tokens[1][trimlen : -trimlen]594        if token.startswith('#'):595          continue  # The whole line is omitted596        token_type, token = _MatchDirective(token)597        if token_type is not None:598          yield token_type, token  # Only yield the token, not space599          continue600    # The line isn't special; process it normally.601    for i, token in enumerate(tokens):602      if i % 2 == 0:603        yield LITERAL_TOKEN, token604      else:  # It's a "directive" in metachracters605        assert token.startswith(meta_left), repr(token)606        assert token.endswith(meta_right), repr(token)607        token = token[trimlen : -trimlen]608        # It's a comment609        if token.startswith('#'):610          continue611        if token.startswith('.'):612          literal = {613              '.meta-left': meta_left,614              '.meta-right': meta_right,615              '.space': ' ',616              '.tab': '\t',617              '.newline': '\n',618              }.get(token)619          if literal is not None:620            yield LITERAL_TOKEN, literal621            continue622          token_type, token = _MatchDirective(token)623          if token_type is not None:624            yield token_type, token625        else:  # Now we know the directive is a substitution.626          yield SUBSTITUTION_TOKEN, token627def CompileTemplate(628    template_str, builder=None, meta='{}', format_char='|',629    more_formatters=lambda x: None, more_predicates=lambda x: None,630    default_formatter='str'):631  """Compile the template string, calling methods on the 'program builder'.632  Args:633    template_str: The template string.  It should not have any compilation634        options in the header -- those are parsed by FromString/FromFile635    builder: The interface of _ProgramBuilder isn't fixed.  Use at your own636        risk.637    meta: The metacharacters to use, e.g. '{}', '[]'.638    more_formatters:639        Something that can map format strings to formatter functions.  One of:640          - A plain dictionary of names -> functions  e.g. {'html': cgi.escape}641          - A higher-order function which takes format strings and returns642            formatter functions.  Useful for when formatters have parsed643            arguments.644          - A FunctionRegistry instance for the most control.  This allows645            formatters which takes contexts as well.646    more_predicates:647        Like more_formatters, but for predicates.648    default_formatter: The formatter to use for substitutions that are missing a649        formatter.  The 'str' formatter the "default default" -- it just tries650        to convert the context value to a string in some unspecified manner.651  Returns:652    The compiled program (obtained from the builder)653  Raises:654    The various subclasses of CompilationError.  For example, if655    default_formatter=None, and a variable is missing a formatter, then656    MissingFormatter is raised.657  This function is public so it can be used by other tools, e.g. a syntax658  checking tool run before submitting a template to source control.659  """660  builder = builder or _ProgramBuilder(more_formatters, more_predicates)661  meta_left, meta_right = SplitMeta(meta)662  # : is meant to look like Python 3000 formatting {foo:.3f}.  According to663  # PEP 3101, that's also what .NET uses.664  # | is more readable, but, more importantly, reminiscent of pipes, which is665  # useful for multiple formatters, e.g. {name|js-string|html}666  if format_char not in (':', '|'):667    raise ConfigurationError(668        'Only format characters : and | are accepted (got %r)' % format_char)669  # If we go to -1, then we got too many {end}.  If end at 1, then we're missing670  # an {end}.671  balance_counter = 0672  for token_type, token in _Tokenize(template_str, meta_left, meta_right):673    if token_type == LITERAL_TOKEN:674      if token:675        builder.Append(token)676      continue677    if token_type in (SECTION_TOKEN, REPEATED_SECTION_TOKEN):678      builder.NewSection(token_type, token)679      balance_counter += 1680      continue681    if token_type == PREDICATE_TOKEN:682      # Everything of the form {.predicate?} starts a new predicate section683      block_made = builder.NewPredicateSection(token)684      balance_counter += 1685      continue686    if token_type == OR_TOKEN:687      builder.NewOrClause(token)688      continue689    if token_type == ALTERNATES_TOKEN:690      builder.AlternatesWith()691      continue692    if token_type == END_TOKEN:693      balance_counter -= 1694      if balance_counter < 0:695        # TODO: Show some context for errors696        raise TemplateSyntaxError(697            'Got too many %send%s statements.  You may have mistyped an '698            "earlier 'section' or 'repeated section' directive."699            % (meta_left, meta_right))700      builder.EndSection()701      continue702    if token_type == SUBSTITUTION_TOKEN:703      parts = token.split(format_char)704      if len(parts) == 1:...
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