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Jeroen F.J. Laros
dicttrie
Commits
8258d45c
Commit
8258d45c
authored
Apr 27, 2017
by
Jeroen F.J. Laros
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Added iterable trie searching.
parent
fd053c81
Changes
1
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1 changed file
with
36 additions
and
27 deletions
+36
27
dict_trie.py
dict_trie/dict_trie.py
+36
27
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dict_trie/dict_trie.py
View file @
8258d45c
def
_hamming
(
path
,
node
,
word
,
distance
):
"""Find the first path in the trie that is within a certain hamming
distance of {word}. Note that this does not necessarily the one with the
smallest distance.
"""Find all paths in the trie that are within a certain hamming distance of
{word}.
:arg str path: Path taken so far to reach the current node.
:arg dict node: Current node.
:arg str word: Query word.
:arg int distance: Amount of errors we can still make.
:returns
str: A word in the trie that has
Hamming distance of at most
:returns
iter: All word in the trie that have
Hamming distance of at most
{distance} to {word}.
"""
if
distance
<
0
:
return
''
return
if
not
word
:
return
path
if
''
in
node
else
''
if
''
in
node
:
yield
path
return
car
,
cdr
=
word
[
0
],
word
[
1
:]
for
char
in
node
:
result
=
_hamming
(
path
+
char
,
node
[
char
],
cdr
,
distance

int
(
char
!=
car
))
if
result
:
return
result
return
''
for
result
in
_hamming
(
path
+
char
,
node
[
char
],
cdr
,
distance

int
(
char
!=
car
)):
yield
result
def
_levenshtein
(
path
,
node
,
word
,
distance
):
"""
"""
if
distance
<
0
:
return
''
return
if
not
word
:
return
path
if
''
in
node
else
''
if
''
in
node
:
yield
path
return
car
,
cdr
=
word
[
0
],
word
[
1
:]
# Deletion.
result
=
_levenshtein
(
path
,
node
,
cdr
,
distance

1
)
if
result
:
return
result
for
result
in
_levenshtein
(
path
,
node
,
cdr
,
distance

1
):
yield
result
for
char
in
node
:
# Substitution and insertion.
result
=
(
_levenshtein
(
path
+
char
,
node
[
char
],
cdr
,
distance

int
(
char
!=
car
))
or
_levenshtein
(
path
+
char
,
node
[
char
],
word
,
distance

1
))
if
result
:
return
result
return
''
for
result
in
_levenshtein
(
path
+
char
,
node
[
char
],
cdr
,
distance

int
(
char
!=
car
)):
yield
result
for
result
in
_levenshtein
(
path
+
char
,
node
[
char
],
word
,
distance

1
):
yield
result
class
Trie
(
object
):
...
...
@@ 107,9 +104,15 @@ class Trie(object):
def
has_prefix
(
self
,
word
):
return
self
.
_find
(
word
)
!=
{}
def
hamming
(
self
,
word
,
distance
):
def
all_
hamming
(
self
,
word
,
distance
):
return
_hamming
(
''
,
self
.
root
,
word
,
distance
)
def
hamming
(
self
,
word
,
distance
):
try
:
return
self
.
all_hamming
(
word
,
distance
)
.
next
()
except
StopIteration
:
return
''
def
best_hamming
(
self
,
word
,
distance
):
"""Find the best match with {word} in the trie.
...
...
@@ 128,9 +131,15 @@ class Trie(object):
return
''
def
levenshtein
(
self
,
word
,
distance
):
def
all_
levenshtein
(
self
,
word
,
distance
):
return
_levenshtein
(
''
,
self
.
root
,
word
,
distance
)
def
levenshtein
(
self
,
word
,
distance
):
try
:
return
self
.
all_levenshtein
(
word
,
distance
)
.
next
()
except
StopIteration
:
return
''
def
best_levenshtein
(
self
,
word
,
distance
):
"""Find the best match with {word} in the trie.
...
...
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