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hack-codegen/src/PartiallyGeneratedCode.php at master · numb4/hack-codegen · GitHub
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<
?
hh
//
strict
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
namespace
Facebook\HackCodegen
;
/**
* Manage partially generated code. The main operation is to merge existing
* code (that probably has some handwritten code) with generated code.
*/
final
class
PartiallyGeneratedCode
{
private
string
$code
;
private
static
string
$manualBegin
=
'
/* BEGIN MANUAL SECTION %s */
'
;
private
static
string
$manualEnd
=
'
/* END MANUAL SECTION */
'
;
public
function
__construct
(
string
$code
) {
$this
->
code
=
$code
;
}
public
static
function
getBeginManualSection
(
string
$id
):
string
{
return
sprintf
(
'
/* BEGIN MANUAL SECTION %s */
'
,
$id
);
}
private
static
function
getBeginManualSectionRegex
(
string
$regex
):
string
{
//
this needs to be kept in sync with getBeginManualSection.
return
sprintf
(
'
|/\* BEGIN MANUAL SECTION %s \*/|
'
,
$regex
);
}
public
static
function
getEndManualSection
():
string
{
return
'
/* END MANUAL SECTION */
'
;
}
public
static
function
containsManualSection
(
string
$code
):
bool
{
return
strpos
(
$code
,
self
::
getEndManualSection())
!==
false
;
}
/**
* Merge the code with the existing code. The manual sections of
* the existing code will be merged into the corresponding sections
* of the new code.
*
* If rekeys is specified, we will attempt to pull code from sections
* with different names, as specified by the mapping.
*/
public
function
merge
(
string
$existing_code
,
?
Map
<
string
,
Vector
<
string
>>
$rekeys
=
null
):
string
{
$merged
=
array
();
$existing
=
$this
->
extractManualCode(
$existing_code
);
$generated
=
$this
->
iterateCodeSections(
$this
->
code
);
foreach
(
$generated
as
$section
) {
list
(
$id
,
$chunk
)
=
$section
;
if
(
$id
===
null
) {
//
Autogenerated section, add it as it is
$merged
[]
=
$chunk
;
}
else
{
if
(
$existing
->
containsKey(
$id
)) {
//
This manual section was present in the existing code, so insert it
$merged
[]
=
$existing
[
$id
];
}
else
{
$content
=
array
();
if
(
$rekeys
!==
null
) {
if
(
$rekeys
->
containsKey(
$id
)) {
foreach
(
$rekeys
[
$id
]
as
$old_id
) {
if
(
$existing
->
containsKey(
$old_id
)) {
$content
[]
=
$existing
[
$old_id
];
}
}
}
}
if
(
$content
) {
$merged
[]
=
implode
(
"
\n\n
"
,
$content
);
}
else
{
//
This manual section is new, so insert inside it the chunk from
//
the generated code (e.g. the generated code can have a comment
//
saying what that manual section should be used for)
$merged
[]
=
$chunk
;
}
}
}
}
return
implode
(
"
\n
"
,
array_filter
(
$merged
));
}
/**
* Extract manually generated code and returns a map of ids to chunks of code
*/
private
function
extractManualCode
(
string
$code
):
Map
<
string
,
string
> {
$manual
=
Map
{};
foreach
(
$this
->
iterateCodeSections(
$code
)
as
$section
) {
list
(
$id
,
$chunk
)
=
$section
;
if
(
$id
!==
null
) {
$manual
[
$id
]
=
$chunk
;
}
}
return
$manual
;
}
/**
* Extract the generated code and returns it as a string.
*/
public
function
extractGeneratedCode
():
string
{
$generated
=
array
();
foreach
(
$this
->
iterateCodeSections(
$this
->
code
)
as
$section
) {
list
(
$id
,
$chunk
)
=
$section
;
if
(
$id
===
null
) {
$generated
[]
=
$chunk
;
}
}
return
implode
(
"
\n
"
,
$generated
);
}
/**
* Validate the manual sections and throws PartiallyGeneratedCodeException
* if there are any errors (e.g. unfinished manual section, nested
* manual sections, duplicated ids, etc)
*/
public
function
assertValidManualSections
():
void
{
foreach
(
$this
->
iterateCodeSections(
$this
->
code
)
as
$section
) {}
}
/**
* Iterates through the code yielding tuples of ($id, $chunk), where
* $id is the id of the manual section or null if it's an auto-generated
* section, and chunk is the code belonging to that section.
* The lines containing begin/end of manual section belong to the
* autogenerated sections.
*/
private
function
iterateCodeSections
(
string
$code
):
\
Generator
<
int
, (?
string
,
string
),
void
> {
//
Regular expression to match the beginning of a manual section
$quoted
=
preg_quote
(
self
::
$manualBegin
,
'
/
'
);
$begin
=
self
::
getBeginManualSectionRegex(
'
(.*)
'
);
$valid_begin
=
self
::
getBeginManualSectionRegex(
'
([A-Za-z0-9:_]+)
'
);
$seen_ids
=
Set
{};
$current_id
=
null
;
$chunk
=
array
();
$manual
=
array
();
$lines
=
explode
(
"
\n
"
,
$code
);
foreach
(
$lines
as
$line
) {
if
(
strpos
(
$line
,
self
::
$manualEnd
)
!==
false
) {
yield
tuple
(
$current_id
,
implode
(
"
\n
"
,
$chunk
));
$chunk
=
array
(
$line
);
$current_id
=
null
;
}
else
if
(
preg_match
(
$begin
,
$line
)
===
1
) {
if
(
$current_id
!==
null
) {
throw
new
PartiallyGeneratedCodeException
(
"
The manual section
$current_id
was open before
"
.
"
the previous one was closed
"
);
}
if
(
!
preg_match
(
$valid_begin
,
$line
)) {
throw
new
PartiallyGeneratedCodeException
(
"
Invalid id specified:
"
.
$line
);
}
$chunk
[]
=
$line
;
yield
tuple
(
null
,
implode
(
"
\n
"
,
$chunk
));
$chunk
=
array
();
$current_id
=
trim
(
preg_replace
(
$begin
,
'
\\
1
'
,
$line
));
if
(
$seen_ids
->
contains(
$current_id
)) {
throw
new
PartiallyGeneratedCodeException
(
"
Duplicate manual section id:
$current_id
"
);
}
$seen_ids
->
add(
$current_id
);
}
else
{
$chunk
[]
=
$line
;
}
}
if
(
$current_id
!==
null
) {
throw
new
PartiallyGeneratedCodeException
(
"
The manual section
$current_id
was not closed at the end of code
"
);
}
if
(
$code
) {
yield
tuple
(
null
,
implode
(
"
\n
"
,
$chunk
));
}
}
}
final
class
PartiallyGeneratedCodeException
extends
\Exception
{};
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