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Allow expressions in list()

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Similar to the previous commit: list() syntactically accepts any
expression and non-variables are compile-time errors. The special
case of ($a) ends up being legal by accident.
This commit is contained in:
Nikita Popov 2020-02-19 21:29:17 +01:00
parent 9dda080a9d
commit 568236a305
3 changed files with 580 additions and 551 deletions
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25
grammar/php7.y
View File

@ -954,22 +954,7 @@ property_name:
; ;
list_expr: list_expr:
T_LIST '(' list_expr_elements ')' { $$ = Expr\List_[$3]; } T_LIST '(' inner_array_pair_list ')' { $$ = Expr\List_[$3]; }
;
list_expr_elements:
list_expr_elements ',' list_expr_element { push($1, $3); }
| list_expr_element { init($1); }
;
list_expr_element:
variable { $$ = Expr\ArrayItem[$1, null, false]; }
| '&' variable { $$ = Expr\ArrayItem[$2, null, true]; }
| list_expr { $$ = Expr\ArrayItem[$1, null, false]; }
| expr T_DOUBLE_ARROW variable { $$ = Expr\ArrayItem[$3, $1, false]; }
| expr T_DOUBLE_ARROW '&' variable { $$ = Expr\ArrayItem[$4, $1, true]; }
| expr T_DOUBLE_ARROW list_expr { $$ = Expr\ArrayItem[$3, $1, false]; }
| /* empty */ { $$ = null; }
; ;
array_pair_list: array_pair_list:
@ -989,10 +974,12 @@ inner_array_pair_list:
; ;
array_pair: array_pair:
expr T_DOUBLE_ARROW expr { $$ = Expr\ArrayItem[$3, $1, false]; } expr { $$ = Expr\ArrayItem[$1, null, false]; }
| expr { $$ = Expr\ArrayItem[$1, null, false]; }
| expr T_DOUBLE_ARROW '&' variable { $$ = Expr\ArrayItem[$4, $1, true]; }
| '&' variable { $$ = Expr\ArrayItem[$2, null, true]; } | '&' variable { $$ = Expr\ArrayItem[$2, null, true]; }
| list_expr { $$ = Expr\ArrayItem[$1, null, false]; }
| expr T_DOUBLE_ARROW expr { $$ = Expr\ArrayItem[$3, $1, false]; }
| expr T_DOUBLE_ARROW '&' variable { $$ = Expr\ArrayItem[$4, $1, true]; }
| expr T_DOUBLE_ARROW list_expr { $$ = Expr\ArrayItem[$3, $1, false]; }
| T_ELLIPSIS expr { $$ = Expr\ArrayItem[$2, null, false, attributes(), true]; } | T_ELLIPSIS expr { $$ = Expr\ArrayItem[$2, null, false, attributes(), true]; }
| /* empty */ { $$ = null; } | /* empty */ { $$ = null; }
; ;

1025
lib/PhpParser/Parser/Php7.php
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File diff suppressed because it is too large Load Diff

81
test/code/parser/expr/exprInList.test Normal file
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@ -0,0 +1,81 @@
Expressions in list()
-----
<?php
// This is legal.
list(($a), ((($b)))) = $x;
// This is illegal, but not a syntax error.
list(1 + 1) = $x;
-----
!!php7
array(
0: Stmt_Expression(
expr: Expr_Assign(
var: Expr_List(
items: array(
0: Expr_ArrayItem(
key: null
value: Expr_Variable(
name: a
)
byRef: false
unpack: false
)
1: Expr_ArrayItem(
key: null
value: Expr_Variable(
name: b
)
byRef: false
unpack: false
)
)
comments: array(
0: // This is legal.
)
)
expr: Expr_Variable(
name: x
)
comments: array(
0: // This is legal.
)
)
comments: array(
0: // This is legal.
)
)
1: Stmt_Expression(
expr: Expr_Assign(
var: Expr_List(
items: array(
0: Expr_ArrayItem(
key: null
value: Expr_BinaryOp_Plus(
left: Scalar_LNumber(
value: 1
)
right: Scalar_LNumber(
value: 1
)
)
byRef: false
unpack: false
)
)
comments: array(
0: // This is illegal, but not a syntax error.
)
)
expr: Expr_Variable(
name: x
)
comments: array(
0: // This is illegal, but not a syntax error.
)
)
comments: array(
0: // This is illegal, but not a syntax error.
)
)
)