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zotonic_stdlib

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Zotonic standard library

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zotonic_stdlib src z_cssmin.erl
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src/z_cssmin.erl 

%% @author Maas-Maarten Zeeman <mmzeeman@xs4all.nl>

%% @copyright 2018 Maas-Maarten Zeeman

%% @doc Javascript minifier. Based on cssmin.c



%% Copyright 2018 Maas-Maarten Zeeman

%%

%% Licensed under the Apache License, Version 2.0 (the "License");

%% you may not use this file except in compliance with the License.

%% You may obtain a copy of the License at

%%

%%     http://www.apache.org/licenses/LICENSE-2.0

%%

%% Unless required by applicable law or agreed to in writing, software

%% distributed under the License is distributed on an "AS IS" BASIS,

%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

%% See the License for the specific language governing permissions and

%% limitations under the License.



%% cssmin is Copyright (c) 2010  (www.ryanday.org)

%% see https://github.com/soldair/cssmin



-module(z_cssmin).



-export([

    minify/1

    ]).



%% @doc Minify a binary containing CSS.

-spec minify( binary() ) -> binary().

minify( CSS ) ->

    machine(CSS, <<>>).



machine(<<>>, Acc) -> Acc;

machine(<<$/, $*, Rest/binary>>, Acc) -> machine(skip_comment(Rest), Acc);

machine(<<C, Rest/binary>>, Acc) when C =:= 32 orelse C =:= 10 -> machine(Rest, Acc);

machine(<<$@, Rest/binary>>, Acc) -> atrule(Rest, <<Acc/binary, $@>>);

machine(Bin, Acc) -> selector(Bin, Acc).



selector(<<>>, Acc) -> Acc;

selector(<<$/, $*, Rest/binary>>, Acc) -> selector(skip_comment(Rest), Acc);

selector(<<${, Rest/binary>>, Acc) -> block(Rest, <<Acc/binary, ${>>);

selector(<<$@, Rest/binary>>, Acc) -> atrule(Rest, <<Acc/binary, $@>>);

selector(<<10, Rest/binary>>, Acc) -> selector(Rest, Acc);

selector(<<32, Rest/binary>>, Acc) -> continue_selector(skip_space(Rest), Acc); 

selector(<<C, Rest/binary>>, Acc) -> selector(Rest, <<Acc/binary, C>>).



continue_selector(<<${, _/binary>> = Rest, Acc) -> selector(Rest, Acc);

continue_selector(Rest, Acc) -> 

    case binary:last(Acc) of

        32 -> selector(Rest, Acc);

        _ -> selector(Rest, <<Acc/binary, 32>>)

    end.



atrule(<<>>, Acc) -> Acc;

atrule(<<$/, $*, Rest/binary>>, Acc) -> atrule(skip_comment(Rest), Acc);

atrule(<<10, Rest/binary>>, Acc) ->

    case Rest of

        <<10, _/binary>> ->

            machine(Rest, <<Acc/binary, $;>>);

        _ ->

            atrule(Rest, <<Acc/binary, 32>>)

    end;

atrule(<<$;, Rest/binary>>, Acc) -> machine(Rest, <<Acc/binary, $;>>);

atrule(<<${, Rest/binary>>, Acc) -> block(Rest, <<Acc/binary, ${>>);

atrule(<<C, Rest/binary>>, Acc) -> atrule(Rest, <<Acc/binary, C>>).

 

block(<<>>, Acc) -> Acc;

block(<<$/, $*, Rest/binary>>, Acc) -> block(skip_comment(Rest), Acc);

block(<<$}, Rest/binary>>, Acc) -> machine(Rest, <<Acc/binary, $}>>);

block(Bin, Acc) -> declaration(skip_whitespace(Bin), Acc).



declaration(<<>>, Acc) -> Acc;



declaration(<<$/, $*, Rest/binary>>, Acc) -> declaration(skip_comment(Rest), Acc);

declaration(<<$(, Rest/binary>>, Acc) -> declaration_in_paren(Rest, <<Acc/binary, $(>>);

declaration(<<$;, Rest/binary>>, Acc) ->

    case skip_whitespace(Rest) of

        <<$}, _/binary>> = Rest1 -> block(Rest1, Acc);

        <<$;, _/binary>> = Rest1 -> block(Rest1, Acc);

        _ -> block(Rest, <<Acc/binary, $;>>)

    end;

declaration(<<$}, Rest/binary>>, Acc) -> machine(Rest, <<Acc/binary, $}>>);

declaration(<<32, Rest/binary>>, Acc) ->

    case binary:last(Acc) of

        32 -> declaration(Rest, Acc);

        _ -> declaration(Rest, <<Acc/binary, 32>>)

    end;

declaration(<<C, Rest/binary>>, Acc) ->

    declaration(Rest, <<Acc/binary, C>>).

 

declaration_in_paren(<<>>, Acc) -> Acc;

declaration_in_paren(<<$), Rest/binary>>, Acc) -> declaration(Rest, <<Acc/binary, $)>>);

declaration_in_paren(<<C, Rest/binary>>, Acc) -> declaration_in_paren(Rest, <<Acc/binary, C>>).



skip_comment(<<>>) -> <<>>;

skip_comment(<<$*, $/, Rest/binary>>) -> Rest;

skip_comment(<<_C, Rest/binary>>) -> skip_comment(Rest).



skip_space(<<32, Rest/binary>>) -> skip_space(Rest);

skip_space(Bin) -> Bin.



skip_whitespace(<<C, Rest/binary>>) when C =:= 32 orelse C =:= 10 -> skip_whitespace(Rest);

skip_whitespace(Bin) -> Bin.