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Format code with rebar3_format plugin #52

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b5467b0
Format code with rebar3_format plugin
michalwski Mar 16, 2020
0b0cda3
Use 4 spaces for sub_ident
michalwski Mar 16, 2020
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7 changes: 6 additions & 1 deletion rebar.config
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
]}
]}.

{plugins, [pc]}.
{plugins, [pc, rebar3_format]}.

% Interrupt compilation, if the artifact is not found
{artifacts, ["priv/exml_nif.so"]}.
Expand Down Expand Up @@ -50,3 +50,8 @@
{cover_export_enabled, true}.
{coveralls_coverdata, "_build/test/cover/eunit.coverdata"}.
{coveralls_service_name, "travis-ci"}.

{format, [
{formatter, default_formatter},
{options, #{sub_indent => 4}}
]}.
55 changes: 24 additions & 31 deletions src/exml.erl
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Expand Up @@ -14,20 +14,15 @@
-include("exml_stream.hrl").

-export([parse/1]).

-export([to_list/1,
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This list of exports is left as-is. That's ok.

to_binary/1,
to_iolist/1,
xml_size/1,
xml_sort/1,
to_pretty_iolist/1]).

-export([]).

-export_type([attr/0,
cdata/0,
element/0,
item/0]).
-export_type([attr/0, cdata/0, element/0, item/0]).
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All exported types are flattened onto one line. Expected: one type per line should be preserved.

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@elbrujohalcon elbrujohalcon Mar 16, 2020 •
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Are you using inline_items => true in your options, by any chance?
If not, then this is a bug and you should report it in the rebar3_format repo.

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@elbrujohalcon we use the default setting, which as far as I know is inline_items => {when_over, 25}

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The issue is here: AdRoll/rebar3_format#88


-type attr() :: {binary(), binary()}.
-type cdata() :: #xmlcdata{}.
Expand All @@ -39,23 +34,23 @@ xml_size([]) ->
0;
xml_size([Elem | Rest]) ->
xml_size(Elem) + xml_size(Rest);
xml_size(#xmlcdata{ content = Content }) ->
xml_size(#xmlcdata{content = Content}) ->
iolist_size(exml_nif:escape_cdata(Content));
xml_size(#xmlel{ name = Name, attrs = Attrs, children = [] }) ->
xml_size(#xmlel{name = Name, attrs = Attrs, children = []}) ->
3 % Self-closing: </>
+ byte_size(Name) + xml_size(Attrs);
xml_size(#xmlel{ name = Name, attrs = Attrs, children = Children }) ->
+ byte_size(Name)
+ xml_size(Attrs);
xml_size(#xmlel{name = Name, attrs = Attrs, children = Children}) ->
% Opening and closing: <></>
5 + byte_size(Name)*2
+ xml_size(Attrs) + xml_size(Children);
xml_size(#xmlstreamstart{ name = Name, attrs = Attrs }) ->
5 + byte_size(Name) * 2 + xml_size(Attrs) + xml_size(Children);
xml_size(#xmlstreamstart{name = Name, attrs = Attrs}) ->
byte_size(Name) + 2 + xml_size(Attrs);
xml_size(#xmlstreamend{ name = Name }) ->
xml_size(#xmlstreamend{name = Name}) ->
byte_size(Name) + 3;
xml_size({Key, Value}) ->
byte_size(Key)
+ 4 % ="" and whitespace before
+ byte_size(Value).
byte_size(Key) +
4 % ="" and whitespace before
+ byte_size(Value).
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Why here the + is at the begging while in the line it was moved to the line above? Is it because of the comment in the prev line?

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It's because of the comment, indeed.


%% @doc Sort a (list of) `xmlel()`.
%%
Expand All @@ -71,17 +66,14 @@ xml_size({Key, Value}) ->
xml_sort(#xmlcdata{} = Cdata) ->
Cdata;
xml_sort(#xmlel{} = El) ->
#xmlel{ attrs = Attrs, children = Children } = El,
El#xmlel{
attrs = lists:sort(Attrs),
children = [ xml_sort(C) || C <- Children ]
};
xml_sort(#xmlstreamstart{ attrs = Attrs } = StreamStart) ->
StreamStart#xmlstreamstart{ attrs = lists:sort(Attrs) };
#xmlel{attrs = Attrs, children = Children} = El,
El#xmlel{attrs = lists:sort(Attrs), children = [xml_sort(C) || C <- Children]};
xml_sort(#xmlstreamstart{attrs = Attrs} = StreamStart) ->
StreamStart#xmlstreamstart{attrs = lists:sort(Attrs)};
xml_sort(#xmlstreamend{} = StreamEnd) ->
StreamEnd;
xml_sort(Elements) when is_list(Elements) ->
lists:sort([ xml_sort(E) || E <- Elements ]).
lists:sort([xml_sort(E) || E <- Elements]).

-spec to_list(element() | [exml_stream:element()]) -> string().
to_list(Element) ->
Expand Down Expand Up @@ -112,10 +104,8 @@ to_iolist([_ | _] = Elements, Pretty) ->
Head = hd(Elements),
[Last | RevChildren] = lists:reverse(tl(Elements)),
case {Head, Last} of
{#xmlstreamstart{name = Name, attrs = Attrs},
#xmlstreamend{name = Name}} ->
Element = #xmlel{name = Name, attrs = Attrs,
children = lists:reverse(RevChildren)},
{#xmlstreamstart{name = Name, attrs = Attrs}, #xmlstreamend{name = Name}} ->
Element = #xmlel{name = Name, attrs = Attrs, children = lists:reverse(RevChildren)},
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A line that's wrapped by hand for record field readability is unwrapped automatically by the formatter.
Expected: One field per line should be preserved.

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As I stated in another comment, the formatter doesn't care about how you formatted your code "by hand". It just reads AST and prints Erlang code. It will never preserve your style.

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@elbrujohalcon how about making a rule (possibly configurable) telling the formatter to have one attribute of a record per line, starting with the first attribute in the same line as the record name? Sth like below:

            Element = #xmlel{name = Name, 
                             attrs = Attrs,
                             children = lists:reverse(RevChildren)},

Would that make sense?

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Yeah… that's exactly the intention of inline_items. That's why it's weird that it's not working here.

to_binary_nif(Element, Pretty);
_ ->
[to_iolist(El, Pretty) || El <- Elements]
Expand All @@ -133,6 +123,9 @@ to_iolist(#xmlcdata{content = Content}, _Pretty) ->
-spec to_binary_nif(element(), pretty | term()) -> binary().
to_binary_nif(#xmlel{} = Element, Pretty) ->
case catch exml_nif:to_binary(Element, Pretty) of
{'EXIT', Reason} -> erlang:error({badxml, Element, Reason});
Result when is_binary(Result) -> Result
{'EXIT', Reason} ->
erlang:error({badxml, Element, Reason});
Result when is_binary(Result) ->
Result
end.

25 changes: 15 additions & 10 deletions src/exml_nif.erl
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Expand Up @@ -11,11 +11,11 @@
-type parser() :: term().
-type stream_element() :: exml:element() | exml_stream:start() | exml_stream:stop().

-export([create/2, parse/1, parse_next/2, escape_cdata/1,
to_binary/2, reset_parser/1]).
-export([create/2, parse/1, parse_next/2, escape_cdata/1, to_binary/2, reset_parser/1]).
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@erszcz erszcz Mar 16, 2020 •
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But this list of exports is flattened to one line (compare with https://github.com/esl/exml/pull/52/files#r393058908). Why? Is there a heuristic that if they're one function per line then they're left as is, but otherwise they're compacted to just one line?

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@elbrujohalcon elbrujohalcon Mar 16, 2020 •
edited
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Are you using inline_items => true in your options, by any chance?
If not, then this is a bug and you should report it in the rebar3_format repo.

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I opened the issue here: AdRoll/rebar3_format#88


-export_type([parser/0, stream_element/0]).

-on_load(load/0).
-on_load({load, 0}).
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%%%===================================================================
%%% Public API
Expand All @@ -33,29 +33,34 @@ load() ->
end,
erlang:load_nif(filename:join(PrivDir, ?MODULE_STRING), none).

-spec create(MaxChildSize :: non_neg_integer(), InfiniteStream :: boolean()) ->
{ok, parser()} | {error, Reason :: any()}.
-spec create(MaxChildSize :: non_neg_integer(), InfiniteStream :: boolean()) -> {ok,
parser()} |
{error,
Reason :: any()}.
create(_, _) ->
erlang:nif_error(not_loaded).

-spec escape_cdata(Bin :: iodata()) -> binary().
escape_cdata(_Bin) ->
erlang:nif_error(not_loaded).
erlang:nif_error(not_loaded).

-spec to_binary(Elem :: exml:element(), pretty | not_pretty) -> binary().
to_binary(_Elem, _Pretty) ->
erlang:nif_error(not_loaded).

-spec parse(Bin :: binary() | [binary()]) -> {ok, exml:element()} | {error, Reason :: any()}.
-spec parse(Bin :: binary() | [binary()]) -> {ok, exml:element()} |
{error, Reason :: any()}.
parse(_) ->
erlang:nif_error(not_loaded).

-spec parse_next(parser(), Data :: binary() | [binary()]) ->
{ok, stream_element() | undefined, non_neg_integer()} |
{error, Reason :: any()}.
-spec parse_next(parser(), Data :: binary() | [binary()]) -> {ok,
stream_element() | undefined,
non_neg_integer()} |
{error, Reason :: any()}.
parse_next(_, _) ->
erlang:nif_error(not_loaded).

-spec reset_parser(parser()) -> any().
reset_parser(_) ->
erlang:nif_error(not_loaded).

111 changes: 65 additions & 46 deletions src/exml_query.erl
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Expand Up @@ -21,16 +21,24 @@
-export([cdata/1]).

-type element_with_ns() :: {element_with_ns, binary()}.
-type element_with_name_and_ns () :: {element_with_ns, binary(), binary()}.
-type element_with_attr_of_value () :: {element_with_attr, binary(), binary()}.
-type element_with_name_and_ns() :: {element_with_ns, binary(), binary()}.
-type element_with_attr_of_value() :: {element_with_attr, binary(), binary()}.
-type path() :: [cdata |
{element, binary()} |
{attr, binary()} |
element_with_ns() |
element_with_name_and_ns() |
element_with_attr_of_value()].

-type path() :: [cdata | %% selects cdata from the element
{element, binary()} | % selects subelement with given name
{attr, binary()} | % selects attr of given name
element_with_ns() | % selects subelement with given namespace
element_with_name_and_ns() | % selects subelement with given name and namespace
element_with_attr_of_value() % selects subelement with given attribute and value
].
%% selects cdata from the element
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The comments are scattered around in a mess. Expected: comments left intact on their respective lines.

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Yeah, this is a known issue. Since it's very hard to solve, we decided that (unless someone writes a PR solving it) for now the formatter can't deal with interleaved comments in type specs. The workaround is to put them all together above the type definition, like a single long comment block.
We know it's not ideal, but don't keep your hopes up for a solution. 🤷‍♂

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In any case, if we rewrite this comment as follows, then it will also be picked up by EDoc and exported to the Docs chunk:

-type path() :: [cdata |
                 {element, binary()} |
                 {attr, binary()} |
                 element_with_ns() |
                 element_with_name_and_ns() |
                 element_with_attr_of_value()
                ].
%% `path()' describes a relative position of a node in an XML document. The allowed path components are: 
%% - `cdata' - selects cdata from the element.
%% - `{element, binary()}' - selects a subelement with a given name.
%% - `{attr, binary()}' - selects an attribute of a given name.
%% - `element_with_*' - select a subelement with given parameters.

The tools are there to help us, but sometimes we have to help the tools help us ;)

% selects subelement with given name

% selects attr of given name
% selects subelement with given namespace

% selects subelement with given name and namespace

% selects subelement with given attribute and value
Comment on lines +33 to +41
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Looks like the formatting put all the comments after the type specification. I wonder if anything can be done about it.

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Check my other comment. It's a known issue, sadly. One that we tried to solve but couldn't.
If you feel like taking a deep dive into rebar3_format and submitting a PR for this, we would gladly accept it :)


-export_type([path/0]).

Expand All @@ -44,7 +52,8 @@ path(Element, Path) ->
path(#xmlel{} = Element, [], _) ->
Element;
path(#xmlel{} = Element, [{element, Name} | Rest], Default) ->
Child = subelement(Element, Name), % may return undefined
Child = subelement(Element,
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Why exactly this was split into two lines? I think the old line length is less that 100 chars.

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This one is very strange. I checked out master branch of this repo on my computer, modified the rebar.config just like you did and run rebar3 format and it doesn't change the line.

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@michalwski michalwski Mar 17, 2020 •
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I did the same @elbrujohalcon and the result is the same as before for me. Do you think it makes a difference what OS or Erlang version is used when running the formatter? I'm on newest Mac OS X and Erlang OTP 22.2

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🤔
My Erlang is Erlang/OTP 21 [erts-10.3.5.3] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe].
I can try with 22.2 later.

Name), % may return undefined
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Why the line break? Sometimes the formatter compacts stuff onto one line, but in this case it inserted a line break due to no apparent reason.

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This is odd, indeed.
Please report this as a bug on the rebar3_format repo.
On the other hand, have you tried with different values for paper and/or ribbon in your configuration? Maybe you have a too narrow paper configuration.

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We have the default vaules paper => 100 and ribbon => 90

path(Child, Rest, Default);
path(#xmlel{} = Element, [{element_with_ns, NS} | Rest], Default) ->
Child = subelement_with_ns(Element, NS),
Expand Down Expand Up @@ -118,17 +127,20 @@ child_with_ns([#xmlel{} = Element | Rest], NS, Default) ->
child_with_ns([_ | Rest], NS, Default) ->
child_with_ns(Rest, NS, Default).

-spec subelement_with_attr(exml:element(), AttrName :: binary(), AttrValue :: binary()) ->
exml:element() | undefined.
-spec subelement_with_attr(exml:element(),
AttrName :: binary(),
AttrValue :: binary()) -> exml:element() | undefined.
subelement_with_attr(Element, AttrName, AttrValue) ->
subelement_with_attr(Element, AttrName, AttrValue, undefined).

-spec subelement_with_attr(Element, AttrName, AttrValue, Other) -> SubElement | Other when
Element :: exml:element(),
AttrName :: binary(),
AttrValue :: binary(),
SubElement :: exml:element(),
Other :: term().
-spec subelement_with_attr(Element, AttrName, AttrValue, Other) -> SubElement |
Other when Element ::
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Is it possible to have the part in when formatted starting from new line, as it was done before? Current rules makes formatting awkward in this case.

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this is a great config option to add! Please open an issue in the rebar3_format repo :)

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exml:element(),
AttrName :: binary(),
AttrValue :: binary(),
SubElement ::
exml:element(),
Other :: term().
subelement_with_attr(#xmlel{children = Children}, AttrName, AttrValue, Default) ->
child_with_attr(Children, AttrName, AttrValue, Default).

Expand All @@ -144,14 +156,15 @@ child_with_attr([#xmlel{} = Element | Rest], AttrName, AttrVal, Default) ->
child_with_attr([_ | Rest], AttrName, AttrVal, Default) ->
child_with_attr(Rest, AttrName, AttrVal, Default).


-spec subelement_with_name_and_ns(exml:element(), binary(), binary()) ->
exml:element() | undefined.
-spec subelement_with_name_and_ns(exml:element(), binary(), binary()) -> exml:element() |
undefined.
subelement_with_name_and_ns(Element, Name, NS) ->
subelement_with_name_and_ns(Element, Name, NS, undefined).

-spec subelement_with_name_and_ns(exml:element(), binary(), binary(), Other) ->
exml:element() | Other.
-spec subelement_with_name_and_ns(exml:element(),
binary(),
binary(),
Other) -> exml:element() | Other.
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@michalwski michalwski Mar 16, 2020 •
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Looks like a rule moving the whole return spec to a new line would work better in case the line is too long. See the spec above also.

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Actually, the formatter could even be smart enough to rewrite:

-spec subelement_with_name_and_ns(exml:element(), binary(), binary(), Other) ->
    exml:element() | Other.

to:

-spec subelement_with_name_and_ns(Element, Name, NS, Default) -> R when
      Element :: exml:element(),
      Name :: binary(),
      NS :: binary(),
      Default :: Other,
      R :: exml:element() | Other.

For specs with more than, for example, 3 parameters.

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this is a great config option to add! Please open an issue in the rebar3_format repo :)

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Here's one for spec expansion/rewriting - AdRoll/rebar3_format#90

subelement_with_name_and_ns(Element, Name, NS, Default) ->
case subelement(Element, Name, undefined) of
undefined ->
Expand All @@ -170,36 +183,41 @@ subelement_or_default(SubElement, NS, Default) ->

-spec subelements(exml:element(), binary()) -> [exml:element()].
subelements(#xmlel{children = Children}, Name) ->
lists:filter(fun(#xmlel{name = N}) when N =:= Name ->
true;
(_) ->
false
end, Children).
lists:filter(fun (#xmlel{name = N}) when N =:= Name ->
true;
(_) ->
false
end,
Children).

-spec subelements_with_ns(exml:element(), binary()) -> [exml:element()].
subelements_with_ns(#xmlel{children = Children}, NS) ->
lists:filter(fun(#xmlel{} = Child) ->
NS =:= attr(Child, <<"xmlns">>);
(_) ->
false
end, Children).

-spec subelements_with_name_and_ns(exml:element(), binary(), binary()) -> [exml:element()].
subelements_with_name_and_ns(#xmlel{children = Children}, Name, NS) ->
lists:filter(fun(#xmlel{name = SubName} = Child) ->
SubName =:= Name andalso
lists:filter(fun (#xmlel{} = Child) ->
NS =:= attr(Child, <<"xmlns">>);
(_) ->
false
end, Children).
(_) ->
false
end,
Children).

-spec subelements_with_name_and_ns(exml:element(),
binary(),
binary()) -> [exml:element()].
subelements_with_name_and_ns(#xmlel{children = Children}, Name, NS) ->
lists:filter(fun (#xmlel{name = SubName} = Child) ->
SubName =:= Name andalso NS =:= attr(Child, <<"xmlns">>);
(_) ->
false
end,
Children).

-spec subelements_with_attr(exml:element(), binary(), binary()) -> [exml:element()].
subelements_with_attr(#xmlel{children = Children}, AttrName, Value) ->
lists:filter(fun(#xmlel{} = Child) ->
Value =:= attr(Child, AttrName);
(_) ->
false
end, Children).
lists:filter(fun (#xmlel{} = Child) ->
Value =:= attr(Child, AttrName);
(_) ->
false
end,
Children).

-spec cdata(exml:element()) -> binary().
cdata(#xmlel{children = Children}) ->
Expand All @@ -217,3 +235,4 @@ attr(#xmlel{attrs = Attrs}, Name, Default) ->
false ->
Default
end.

24 changes: 7 additions & 17 deletions src/exml_stream.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -10,22 +10,11 @@

-include("exml_stream.hrl").

-export([new_parser/0,
new_parser/1,
parse/2,
reset_parser/1,
free_parser/1]).
-export([new_parser/0, new_parser/1, parse/2, reset_parser/1, free_parser/1]).

-export_type([element/0,
start/0,
stop/0,
parser/0,
parser_opt/0]).
-export_type([element/0, start/0, stop/0, parser/0, parser_opt/0]).

-record(parser, {
event_parser :: exml_nif:parser(),
buffer :: [binary()]
}).
-record(parser, {event_parser :: exml_nif:parser(), buffer :: [binary()]}).

-type start() :: #xmlstreamstart{}.
-type stop() :: #xmlstreamend{}.
Expand All @@ -46,7 +35,7 @@ new_parser() ->
new_parser([]).

-spec new_parser([parser_opt()]) -> {ok, parser()} | {error, any()}.
new_parser(Opts)->
new_parser(Opts) ->
MaxChildSize = proplists:get_value(max_child_size, Opts, 0),
InfiniteStream = proplists:get_value(infinite_stream, Opts, false),
case exml_nif:create(MaxChildSize, InfiniteStream) of
Expand All @@ -56,8 +45,8 @@ new_parser(Opts)->
Error
end.

-spec parse(parser(), binary()) -> {ok, parser(), [exml_stream:element()]}
| {error, Reason :: any()}.
-spec parse(parser(), binary()) -> {ok, parser(), [exml_stream:element()]} |
{error, Reason :: any()}.
parse(Parser, Input) when is_binary(Input) ->
#parser{event_parser = EventParser, buffer = OldBuf} = Parser,
Buffer = OldBuf ++ [Input],
Expand Down Expand Up @@ -101,3 +90,4 @@ drop_offset([Front | Rest], Offset) when byte_size(Front) =< Offset ->
drop_offset([Front | Rest], Offset) ->
<<_:Offset/binary, Part/binary>> = Front,
[Part | Rest].