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POTTIER Francois
menhir
Commits
2c3b4bf5
Commit
2c3b4bf5
authored
Jul 02, 2015
by
POTTIER Francois
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Comments and cleanup.
parent
bd473c2d
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src/grammar.ml
src/grammar.ml
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src/grammar.ml
View file @
2c3b4bf5
...
...
@@ 761,6 +761,11 @@ let () =
(* Support for analyses of the grammar, expressed as fixed point computations.
We exploit the generic fixed point algorithm in [Fix]. *)
(* We perform memoization only at nonterminal symbols. We assume that the
analysis of a symbol is the analysis of its definition (as opposed to,
say, a computation that depends on the occurrences of this symbol in
the grammar). *)
module
GenericAnalysis
(
P
:
Fix
.
PROPERTY
)
(
S
:
sig
...
...
@@ 798,7 +803,10 @@ module GenericAnalysis
(* The results of the analysis take the following form. *)
(* To every nonterminal symbol, we associate a property. *)
val
lfp
:
Nonterminal
.
t
>
property
val
nonterminal
:
Nonterminal
.
t
>
property
(* To every symbol, we associate a property. *)
val
symbol
:
Symbol
.
t
>
property
(* To every suffix of every production, we associate a property.
The offset [i], which determines the beginning of the suffix,
...
...
@@ 809,13 +817,23 @@ module GenericAnalysis
end
=
struct
open
P
(* TEMPORARY isolate and publish the analysis of a symbol *)
(* The following analysis functions are parameterized over [get], which allows
making a recursive call to the analysis at a nonterminal symbol. [get] maps
a nonterminal symbol to a property. *)
(* Analysis of a symbol. *)
(* Analyzing a production whose righthand side is [rhs], starting at index [i].
The parameter [get] allows a recursive call to the analysis at a nonterminal
symbol. *)
let
symbol
sym
get
:
property
=
match
sym
with

Symbol
.
T
tok
>
S
.
terminal
tok

Symbol
.
N
nt
>
(* Recursive call to the analysis, via [get]. *)
get
nt
(* Analysis of (a suffix of) a production [prod], starting at index [i]. *)
let
production
prod
i
(
get
:
Nonterminal
.
t
>
property
)
:
property
=
let
production
prod
i
get
:
property
=
let
rhs
=
Production
.
rhs
prod
in
let
n
=
Array
.
length
rhs
in
(* Conjunction over all symbols in the righthand side. This can be viewed
...
...
@@ 826,16 +844,10 @@ end = struct
if
i
=
n
then
S
.
epsilon
else
let
symbol
=
rhs
.
(
i
)
in
let
p
:
property
=
match
symbol
with

Symbol
.
T
tok
>
S
.
terminal
tok

Symbol
.
N
nt
>
(* Recursive call to the analysis, via [get]. *)
get
nt
in
S
.
conjunction
symbol
p
(
lazy
(
loop
(
i
+
1
)))
let
sym
=
rhs
.
(
i
)
in
S
.
conjunction
sym
(
symbol
sym
get
)
(
lazy
(
loop
(
i
+
1
)))
in
loop
i
...
...
@@ 843,7 +855,7 @@ end = struct
analyzes a nonterminal symbol by looking up and analyzing its definition
as a disjunction of conjunctions of symbols. *)
let
n
tdef
nt
(
get
:
Nonterminal
.
t
>
property
)
:
property
=
let
n
onterminal
nt
get
:
property
=
(* Disjunction over all productions for this nonterminal symbol. *)
Production
.
foldnt_lazy
nt
(
fun
prod
rest
>
S
.
disjunction
...
...
@@ 859,13 +871,16 @@ end = struct
(
Maps
.
ConsecutiveIntegerKeysToImperativeMaps
(
Nonterminal
))
(
P
)
let
lfp
:
Nonterminal
.
t
>
property
=
F
.
lfp
ntdef
let
nonterminal
=
F
.
lfp
nonterminal
(* The auxiliary functions can be published too. *)
(* The analysis of a (suffix of a) production can be published too. *)
let
symbol
sym
=
symbol
sym
nonterminal
let
production
prod
i
:
property
=
production
prod
i
lfp
let
production
prod
i
=
production
prod
i
nonterminal
end
...
...
@@ 960,7 +975,7 @@ let nonempty' =
let
epsilon
=
true
end
)
in
NONEMPTY
.
lfp
NONEMPTY
.
nonterminal
let
nullable'
=
let
module
NULLABLE
=
...
...
@@ 977,7 +992,7 @@ let nullable' =
let
epsilon
=
true
end
)
in
NULLABLE
.
lfp
NULLABLE
.
nonterminal
(* TEMPORARY sanity check *)
let
()
=
...
...
@@ 1027,7 +1042,7 @@ let () =
TerminalSet
.
compare
original
updated
<>
0
)
let
first'
,
_first_prod'
=
let
first'
,
_first_prod'
,
_first_symbol'
=
let
module
FIRST
=
GenericAnalysis
(
TerminalSet
)
...
...
@@ 1048,7 +1063,7 @@ let first', _first_prod' =
let
epsilon
=
TerminalSet
.
empty
end
)
in
FIRST
.
lfp
,
FIRST
.
production
FIRST
.
nonterminal
,
FIRST
.
production
,
FIRST
.
symbol
(* TEMPORARY sanity check *)
let
()
=
...
...
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