diff options
Diffstat (limited to 'Cython/Plex/Transitions.py')
| -rw-r--r-- | Cython/Plex/Transitions.py | 51 |
1 files changed, 17 insertions, 34 deletions
diff --git a/Cython/Plex/Transitions.py b/Cython/Plex/Transitions.py index 383381794..f58dd538e 100644 --- a/Cython/Plex/Transitions.py +++ b/Cython/Plex/Transitions.py @@ -1,15 +1,11 @@ -# -# Plex - Transition Maps -# -# This version represents state sets directly as dicts for speed. -# +# cython: auto_pickle=False +""" +Plex - Transition Maps -from __future__ import absolute_import +This version represents state sets directly as dicts for speed. +""" -try: - from sys import maxsize as maxint -except ImportError: - from sys import maxint +maxint = 2**31-1 # sentinel value class TransitionMap(object): @@ -40,24 +36,19 @@ class TransitionMap(object): kept separately in a dictionary. """ - map = None # The list of codes and states - special = None # Mapping for special events - def __init__(self, map=None, special=None): if not map: map = [-maxint, {}, maxint] if not special: special = {} - self.map = map - self.special = special - #self.check() ### + self.map = map # The list of codes and states + self.special = special # Mapping for special events - def add(self, event, new_state, - TupleType=tuple): + def add(self, event, new_state): """ Add transition to |new_state| on |event|. """ - if type(event) is TupleType: + if type(event) is tuple: code0, code1 = event i = self.split(code0) j = self.split(code1) @@ -68,12 +59,11 @@ class TransitionMap(object): else: self.get_special(event)[new_state] = 1 - def add_set(self, event, new_set, - TupleType=tuple): + def add_set(self, event, new_set): """ Add transitions to the states in |new_set| on |event|. """ - if type(event) is TupleType: + if type(event) is tuple: code0, code1 = event i = self.split(code0) j = self.split(code1) @@ -84,15 +74,13 @@ class TransitionMap(object): else: self.get_special(event).update(new_set) - def get_epsilon(self, - none=None): + def get_epsilon(self): """ Return the mapping for epsilon, or None. """ - return self.special.get('', none) + return self.special.get('') - def iteritems(self, - len=len): + def iteritems(self): """ Return the mapping as an iterable of ((code1, code2), state_set) and (special_event, state_set) pairs. @@ -119,8 +107,7 @@ class TransitionMap(object): # ------------------- Private methods -------------------- - def split(self, code, - len=len, maxint=maxint): + def split(self, code): """ Search the list for the position of the split point for |code|, inserting a new split point if necessary. Returns index |i| such @@ -132,6 +119,7 @@ class TransitionMap(object): # Special case: code == map[-1] if code == maxint: return hi + # General case lo = 0 # loop invariant: map[lo] <= code < map[hi] and hi - lo >= 2 @@ -147,7 +135,6 @@ class TransitionMap(object): return lo else: map[hi:hi] = [code, map[hi - 1].copy()] - #self.check() ### return hi def get_special(self, event): @@ -243,9 +230,5 @@ class TransitionMap(object): # State set manipulation functions # -#def merge_state_sets(set1, set2): -# for state in set2.keys(): -# set1[state] = 1 - def state_set_str(set): return "[%s]" % ','.join(["S%d" % state.number for state in set]) |