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<?php
namespace
PhpBench
\
Expression
;
use
PhpBench
\
Expression
\
Exception
\
ParseletNotFound
;
/**
* @template T of Parselet
*/
final
class
Parselets
{
/**
* @var array<string,T>
*/
private
$
parselets
;
/**
* @var string
*/
private
$
type
;
/**
* @param T[] $parselets
*/
private
function
__construct
(
array
$
parselets
,
string
$
type
)
{
foreach
(
$
parselets
as
$
parselet
) {
$
this
->
parselets
[
$
parselet
->
tokenType
()] =
$
parselet
;
}
$
this
->
type
=
$
type
;
}
/**
* @param PrefixParselet[] $parselets
*
* @return self<PrefixParselet>
*/
public
static
function
fromPrefixParselets
(
array
$
parselets
):
self
{
return
new
self
(
$
parselets
,
'
prefix
'
);
}
/**
* @param InfixParselet[] $parselets
*
* @return self<InfixParselet>
*/
public
static
function
fromInfixParselets
(
array
$
parselets
):
self
{
return
new
self
(
$
parselets
,
'
infix
'
);
}
/**
* @param SuffixParselet[] $parselets
*
* @return self<SuffixParselet>
*/
public
static
function
fromSuffixParselets
(
array
$
parselets
):
self
{
return
new
self
(
$
parselets
,
'
suffix
'
);
}
/**
* @return T
*/
public
function
forToken
(
Token
$
token
):
Parselet
{
$
parselet
=
$
this
->
forTokenOrNull
(
$
token
);
if
(
null
===
$
parselet
) {
throw
new
ParseletNotFound
(
sprintf
(
'
No %s parslet for token type "%s" registered
'
,
$
this
->
type
,
$
token
->
type
));
}
return
$
parselet
;
}
/**
* @return T|null
*/
public
function
forTokenOrNull
(
Token
$
token
): ?
Parselet
{
if
(!
isset
(
$
this
->
parselets
[
$
token
->
type
])) {
return
null
;
}
return
$
this
->
parselets
[
$
token
->
type
];
}
}
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