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import py
class Node(object):
def view(self):
from dotviewer import graphclient
content = ["digraph G{"]
content.extend(self.dot())
content.append("}")
try:
p = py.test.ensuretemp("automaton").join("temp.dot")
remove = False
except AttributeError: # pytest lacks ensuretemp, make a normal one
p = py.path.local.mkdtemp().join('automaton.dot')
remove = True
p.write("\n".join(content))
graphclient.display_dot_file(str(p))
if remove:
p.dirpath().remove()
class Symbol(Node):
def __init__(self, symbol, additional_info, token):
self.symbol = symbol
self.additional_info = additional_info
self.token = token
def getsourcepos(self):
return self.token.source_pos
def __repr__(self):
return "Symbol(%r, %r)" % (self.symbol, self.additional_info)
def dot(self):
symbol = (self.symbol.replace("\\", "\\\\").replace('"', '\\"')
.replace('\n', '\\l'))
addinfo = str(self.additional_info).replace('"', "'") or "_"
yield ('"%s" [shape=box,label="%s\\n%s"];' % (
id(self), symbol,
repr(addinfo).replace('"', '').replace("\\", "\\\\")))
def visit(self, visitor):
"NOT_RPYTHON"
if isinstance(visitor, RPythonVisitor):
return visitor.dispatch(self)
method = getattr(visitor, "visit_" + self.symbol, None)
if method is None:
return self
return method(self)
class Nonterminal(Node):
def __init__(self, symbol, children):
self.children = children
self.symbol = symbol
def getsourcepos(self):
try:
return self.children[0].getsourcepos()
except IndexError:
raise
def __str__(self):
return "%s(%s)" % (self.symbol, ", ".join([str(c) for c in self.children]))
def __repr__(self):
return "Nonterminal(%r, %r)" % (self.symbol, self.children)
def dot(self):
yield '"%s" [label="%s"];' % (id(self), self.symbol)
for child in self.children:
yield '"%s" -> "%s";' % (id(self), id(child))
if isinstance(child, Node):
for line in child.dot():
yield line
else:
yield '"%s" [label="%s"];' % (
id(child),
repr(child).replace('"', '').replace("\\", "\\\\"))
def visit(self, visitor):
"NOT_RPYTHON"
if isinstance(visitor, RPythonVisitor):
return visitor.dispatch(self)
general = getattr(visitor, "visit", None)
if general is None:
return getattr(visitor, "visit_" + self.symbol)(self)
else:
specific = getattr(visitor, "visit_" + self.symbol, None)
if specific is None:
return general(self)
else:
return specific(self)
class VisitError(Exception):
def __init__(self, node):
self.node = node
self.args = (node, )
def __str__(self):
return "could not visit %s" % (self.node, )
def make_dispatch_function(__general_nonterminal_visit=None,
__general_symbol_visit=None,
__general_visit=None,
**dispatch_table):
def dispatch(self, node):
if isinstance(node, Nonterminal):
func = dispatch_table.get(node.symbol, None)
if func is None:
if __general_nonterminal_visit:
return __general_nonterminal_visit(self, node)
else:
return func(self, node)
elif isinstance(node, Symbol):
func = dispatch_table.get(node.symbol, None)
if func is None:
if __general_symbol_visit:
return __general_symbol_visit(self, node)
else:
return func(self, node)
if __general_visit:
return __general_visit(self, node)
raise VisitError(node)
return dispatch
class CreateDispatchDictionaryMetaclass(type):
def __new__(cls, name_, bases, dct):
dispatch_table = {}
for name, value in dct.iteritems():
if name.startswith("visit_"):
dispatch_table[name[len("visit_"):]] = value
for special in ["general_symbol_visit",
"general_nonterminal_visit",
"general_visit"]:
if special in dct:
dispatch_table["__" + special] = dct[special]
dct["dispatch"] = make_dispatch_function(**dispatch_table)
return type.__new__(cls, name_, bases, dct)
class RPythonVisitor(object):
__metaclass__ = CreateDispatchDictionaryMetaclass
|
