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POTTIER Francois
menhir
Commits
6b027bc8
Commit
6b027bc8
authored
Oct 02, 2019
by
POTTIER Francois
Committed by
POTTIER Francois
Jan 30, 2020
Browse files
New function [Lr0.new_numbering].
parent
efc97c8a
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2
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src/lr0.ml
src/lr0.ml
+22
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src/lr0.mli
src/lr0.mli
+7
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src/lr0.ml
View file @
6b027bc8
...
...
@@ 423,6 +423,28 @@ let subsume ((k1, toksr1) as state1) ((k2, toksr2) as state2) =
in
loop
(
Array
.
length
toksr1
)
(* A memoizer for the type [lr1state]. This code is simpleminded, but its
efficiency is sufficient: 10000 states are numbered in about 0.01s. *)
module
M
=
Memoize
.
ForOrderedType
(
struct
type
t
=
lr1state
let
compare
s1
s2
=
let
c
=
core
s1

core
s2
in
if
c
<>
0
then
c
else
compare
s1
s2
end
)
(* A facility for assigning unique numbers to LR(1) states. *)
let
new_numbering
()
=
let
m
=
ref
0
in
let
number
:
lr1state
>
int
=
M
.
memoize
(
fun
(
_
:
lr1state
)
>
Misc
.
postincrement
m
)
and
current
()
=
!
m
in
number
,
current
(* This function determines whether two (coreequivalent) states are
compatible, according to a criterion that is close to Pager's weak
compatibility criterion.
...
...
src/lr0.mli
View file @
6b027bc8
...
...
@@ 114,6 +114,13 @@ val compare: lr1state > lr1state > int
val
subsume
:
lr1state
>
lr1state
>
bool
(* A facility for assigning unique numbers to LR(1) states. The call
[new_numbering] returns a pair of functions [number, current], where
[number] maps LR(1) states to unique (freshly assigned) numbers and
[current] returns the next available number. *)
val
new_numbering
:
unit
>
(
lr1state
>
int
)
*
(
unit
>
int
)
(* A slightly modified version of Pager's weak compatibility
criterion. The two states must have the same core. *)
...
...
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