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Taddeüs Kroes
trs
Commits
4eeb4ba8
Commit
4eeb4ba8
authored
Jan 23, 2012
by
Sander Mathijs van Veen
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Plain Diff
Added possibilities to fraction rules.
parent
bfd41939
Changes
2
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Inline
Side-by-side
Showing
2 changed files
with
20 additions
and
4 deletions
+20
-4
src/rules/fractions.py
src/rules/fractions.py
+18
-2
tests/test_rules_fractions.py
tests/test_rules_fractions.py
+2
-2
No files found.
src/rules/fractions.py
View file @
4eeb4ba8
...
...
@@ -28,11 +28,11 @@ def match_constant_division(node):
# 0 / a
if
nominator
==
0
:
p
.
append
(
P
(
node
,
division_of_zero
))
p
.
append
(
P
(
node
,
division_of_zero
,
(
denominator
,)
))
# a / a
if
nominator
==
denominator
:
p
.
append
(
P
(
node
,
division_by_self
))
p
.
append
(
P
(
node
,
division_by_self
,
(
nominator
,)
))
return
p
...
...
@@ -44,6 +44,9 @@ def division_by_one(root, args):
return
args
[
0
]
MESSAGES
[
division_by_one
]
=
_
(
'Division of {1} by 1 reduces to {1}.'
)
def
division_of_zero
(
root
,
args
):
"""
0 / a -> 0
...
...
@@ -51,6 +54,9 @@ def division_of_zero(root, args):
return
L
(
0
)
MESSAGES
[
division_of_zero
]
=
_
(
'Division of 0 by {1} reduces to 0.'
)
def
division_by_self
(
root
,
args
):
"""
a / a -> 1
...
...
@@ -58,6 +64,9 @@ def division_by_self(root, args):
return
L
(
1
)
MESSAGES
[
division_by_self
]
=
_
(
'Division of {1} by {1} reduces to 1.'
)
def
match_add_constant_fractions
(
node
):
"""
1 / 2 + 3 / 4 -> 2 / 4 + 3 / 4 # Equalize denominators
...
...
@@ -118,6 +127,10 @@ def equalize_denominators(root, args):
return
nary_node
(
'+'
,
scope
)
MESSAGES
[
equalize_denominators
]
=
_
(
'Equalize the denominators of division'
' of {1} by {2}.'
)
def
add_nominators
(
root
,
args
):
"""
a / b + c / b -> (a + c) / b
...
...
@@ -145,6 +158,9 @@ def add_nominators(root, args):
return
nary_node
(
'+'
,
scope
)
MESSAGES
[
add_nominators
]
=
_
(
'Add nominators of the division of {1} by {2}.'
)
def
match_expand_and_add_fractions
(
node
):
"""
a * b / c + d * b / c -> (a + d) * (b / c)
...
...
tests/test_rules_fractions.py
View file @
4eeb4ba8
...
...
@@ -21,11 +21,11 @@ class TestRulesFractions(RulesTestCase):
root
=
zero
/
a
possibilities
=
match_constant_division
(
root
)
self
.
assertEqualPos
(
possibilities
,
[
P
(
root
,
division_of_zero
)])
self
.
assertEqualPos
(
possibilities
,
[
P
(
root
,
division_of_zero
,
(
a
,)
)])
root
=
a
/
a
possibilities
=
match_constant_division
(
root
)
self
.
assertEqualPos
(
possibilities
,
[
P
(
root
,
division_by_self
)])
self
.
assertEqualPos
(
possibilities
,
[
P
(
root
,
division_by_self
,
(
a
,)
)])
def
test_division_by_one
(
self
):
a
=
tree
(
'a'
)
...
...
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