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RustPython/scripts/generate_sre_constants.py at main · RustPython/RustPython · GitHub
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RustPython
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scripts
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generate_sre_constants.py
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generate_sre_constants.py
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#! /usr/bin/env python3
# This script generates crates/sre_engine/src/constants.rs from Lib/re/_constants.py.
SCRIPT_NAME
=
"scripts/generate_sre_constants.py"
def
update_file
(
file
,
content
):
try
:
with
open
(
file
,
"r"
)
as
fobj
:
if
fobj
.
read
()
==
content
:
return
False
except
(
OSError
,
ValueError
):
pass
with
open
(
file
,
"w"
)
as
fobj
:
fobj
.
write
(
content
)
return
True
sre_constants_header
=
f"""
\
/*
* Secret Labs' Regular Expression Engine
*
* regular expression matching engine
*
* Auto-generated by
{
SCRIPT_NAME
}
from
* Lib/re/_constants.py.
*
* Copyright (c) 1997-2001 by Secret Labs AB. All rights reserved.
*
* See the sre.c file for information on usage and redistribution.
*/
"""
def
dump_enum
(
d
,
enum_name
,
derives
,
strip_prefix
=
""
):
"""Generate Rust enum definitions from a Python dictionary.
Args:
d (list): The list containing the enum variants.
enum_name (str): The name of the enum to generate.
derives (str): The derive attributes to include.
strip_prefix (str, optional): A prefix to strip from the variant names. Defaults to "".
Returns:
list: A list of strings representing the enum definition.
"""
items
=
sorted
(
d
)
print
(
f"items is
{
items
}
"
)
content
=
[
f"
{
derives
}
\n
"
]
content
.
append
(
"#[repr(u32)]
\n
"
)
content
.
append
(
"#[allow(non_camel_case_types, clippy::upper_case_acronyms)]
\n
"
)
content
.
append
(
f"pub enum
{
enum_name
}
{{
\n
"
)
for
i
,
item
in
enumerate
(
items
):
name
=
str
(
item
).
removeprefix
(
strip_prefix
)
content
.
append
(
f"
{
name
}
=
{
i
}
,
\n
"
)
content
.
append
(
"}
\n
\n
"
)
return
content
def
dump_bitflags
(
d
,
prefix
,
derives
,
struct_name
,
int_t
):
"""Generate Rust bitflags definitions from a Python dictionary.
Args:
d (dict): The dictionary containing the bitflag variants.
prefix (str): The prefix to strip from the variant names.
derives (str): The derive attributes to include.
struct_name (str): The name of the struct to generate.
int_t (str): The integer type to use for the bitflags.
Returns:
list: A list of strings representing the bitflags definition.
"""
items
=
[(
value
,
name
)
for
name
,
value
in
d
.
items
()
if
name
.
startswith
(
prefix
)]
content
=
[
"bitflags! {
\n
"
]
content
.
append
(
f"
{
derives
}
\n
"
)
if
derives
else
None
content
.
append
(
f" pub struct
{
struct_name
}
:
{
int_t
}
{{
\n
"
)
for
value
,
name
in
sorted
(
items
):
name
=
str
(
name
).
removeprefix
(
prefix
)
content
.
append
(
f" const
{
name
}
=
{
value
}
;
\n
"
)
content
.
append
(
" }
\n
"
)
content
.
append
(
"}
\n
\n
"
)
return
content
def
main
(
infile
=
"Lib/re/_constants.py"
,
outfile_constants
=
"crates/sre_engine/src/constants.rs"
,
):
ns
=
{}
with
open
(
infile
)
as
fp
:
code
=
fp
.
read
()
exec
(
code
,
ns
)
content
=
[
sre_constants_header
]
content
.
append
(
"use bitflags::bitflags;
\n
\n
"
)
content
.
append
(
f"pub const SRE_MAGIC: usize =
{
ns
[
'MAGIC'
]
}
;
\n
"
)
content
.
extend
(
dump_enum
(
ns
[
"OPCODES"
],
"SreOpcode"
,
"#[derive(num_enum::TryFromPrimitive, Debug, PartialEq, Eq)]"
,
)
)
content
.
extend
(
dump_enum
(
ns
[
"ATCODES"
],
"SreAtCode"
,
"#[derive(num_enum::TryFromPrimitive, Debug, PartialEq, Eq)]"
,
"AT_"
,
)
)
content
.
extend
(
dump_enum
(
ns
[
"CHCODES"
],
"SreCatCode"
,
"#[derive(num_enum::TryFromPrimitive, Debug)]"
,
"CATEGORY_"
,
)
)
content
.
extend
(
dump_bitflags
(
ns
,
"SRE_FLAG_"
,
"#[derive(Debug, PartialEq, Eq, Clone, Copy)]"
,
"SreFlag"
,
"u16"
,
)
)
content
.
extend
(
dump_bitflags
(
ns
,
"SRE_INFO_"
,
""
,
"SreInfo"
,
"u32"
))
update_file
(
outfile_constants
,
""
.
join
(
content
))
if
__name__
==
"__main__"
:
import
sys
main
(
*
sys
.
argv
[
1
:])
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