diff options
| author | Jed Barber <jjbarber@y7mail.com> | 2020-12-01 23:14:41 +1100 |
|---|---|---|
| committer | Jed Barber <jjbarber@y7mail.com> | 2020-12-01 23:14:41 +1100 |
| commit | 52403b22ff3463b9b3b0f8f26c0f965f50e4b458 (patch) | |
| tree | 46ac180490c46e9ad10fa6a207a13ab89cd82d89 /src | |
| parent | d5df1b33144f92b6070e957db293e36b27e14439 (diff) | |
Proper Allow_Incomplete behaviour in non-curtailing parser combinators
Diffstat (limited to 'src')
| -rw-r--r-- | src/packrat-parsers.adb | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/src/packrat-parsers.adb b/src/packrat-parsers.adb index bfb67d7..f49eca1 100644 --- a/src/packrat-parsers.adb +++ b/src/packrat-parsers.adb @@ -743,7 +743,14 @@ package body Packrat.Parsers is elsif Items'Length = 0 then return Empty (Input, Context, Start); end if; - My_Offset := Natural'Min (Input'Last - Start, Items'Length - 1); + if Input'Last - Start < Items'Length - 1 then + if not Context.Allow_Incomplete then + return Empty_Fail; + end if; + My_Offset := Input'Last - Start; + else + My_Offset := Items'Length - 1; + end if; if Input (Start .. Start + My_Offset) /= Items (Items'First .. Items'First + My_Offset) then @@ -778,7 +785,14 @@ package body Packrat.Parsers is if Start > Input'Last then return Empty_Fail; end if; - My_Offset := Natural'Min (Input'Last - Start, Number - 1); + if Input'Last - Start < Number - 1 then + if not Context.Allow_Incomplete then + return Empty_Fail; + end if; + My_Offset := Input'Last - Start; + else + My_Offset := Number - 1; + end if; return Salt : Combinator_Result do Part.Finish := Start + My_Offset; Part.Value := Elem_Holds.To_Holder (Input (Start .. Start + My_Offset)); @@ -816,7 +830,8 @@ package body Packrat.Parsers is Part.Finish := My_Finish; Part.Value := Elem_Holds.To_Holder (Input (Start .. My_Finish)); Salt.Results.Insert (Part); - Salt.Status := (if My_Finish = Input'Last then Optional_More else Success); + Salt.Status := (if My_Finish = Input'Last and Context.Allow_Incomplete + then Optional_More else Success); end return; end Actual; function Call is new Memoize (To_Key (Start, Take_While'Access), Actual); @@ -849,7 +864,8 @@ package body Packrat.Parsers is Part.Finish := My_Finish; Part.Value := Elem_Holds.To_Holder (Input (Start .. My_Finish)); Salt.Results.Insert (Part); - Salt.Status := (if My_Finish = Input'Last then Optional_More else Success); + Salt.Status := (if My_Finish = Input'Last and Context.Allow_Incomplete + then Optional_More else Success); end return; end Actual; function Call is new Memoize (To_Key (Start, Take_Until'Access), Actual); |