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Support omission of string slice low/high indices, BIT-1097.

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Omission of the low index defaults to 0:

    s = "12345"; s[:3] == "123"

Omission of the high index defaults to length of the string:

    s = "12345"; s[3:] == "45"
This commit is contained in:
Jon Siwek 2013-12-04 15:11:48 -06:00
parent 4014cdc277
commit 8515d3aa57
3 changed files with 56 additions and 4 deletions
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17
src/parse.y
View file

@ -55,7 +55,7 @@
%type <expr> opt_init
%type <val> TOK_CONSTANT
%type <re> pattern
%type <expr> expr init anonymous_function
%type <expr> expr opt_expr init anonymous_function
%type <event_expr> event
%type <stmt> stmt stmt_list func_body for_head
%type <type> type opt_type enum_body
@ -261,6 +261,13 @@ decl_list:
|
;
opt_expr:
expr
{ $$ = $1; }
|
{ $$ = 0; }
;
expr:
'(' expr ')'
{
@ -418,11 +425,13 @@ expr:
$$ = new IndexExpr($1, $3);
}
| expr '[' expr ':' expr ']'
| expr '[' opt_expr ':' opt_expr ']'
{
set_location(@1, @6);
ListExpr* le = new ListExpr($3);
le->Append($5);
Expr* low = $3 ? $3 : new ConstExpr(new Val(0, TYPE_COUNT));
Expr* high = $5 ? $5 : new SizeExpr($1);
ListExpr* le = new ListExpr(low);
le->Append(high);
$$ = new IndexExpr($1, le, true);
}