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Diffstat (limited to 'src/asciideck_attributes_pass.erl')
| -rw-r--r-- | src/asciideck_attributes_pass.erl | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/asciideck_attributes_pass.erl b/src/asciideck_attributes_pass.erl new file mode 100644 index 0000000..393b57d --- /dev/null +++ b/src/asciideck_attributes_pass.erl @@ -0,0 +1,112 @@ +%% Copyright (c) 2017-2018, Loïc Hoguin <[email protected]> +%% +%% Permission to use, copy, modify, and/or distribute this software for any +%% purpose with or without fee is hereby granted, provided that the above +%% copyright notice and this permission notice appear in all copies. +%% +%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + +%% The purpose of this pass is to apply attributes to +%% their corresponding blocks. For macros the attributes +%% are already applied. For inline elements the inline +%% pass is taking care of it. +-module(asciideck_attributes_pass). + +-export([run/1]). + +run([]) -> + []; +%% A block identifier is an alternative way of specifying +%% the id attribute for a block. +run([{block_id, #{id := ID}, <<>>, _}|Tail0]) -> + Tail = apply_attributes(Tail0, #{<<"id">> => ID}), + run(Tail); +%% A block title is ultimately treated as an attribute +%% for the following block. +run([{block_title, _, Title, _}|Tail0]) -> + Tail = apply_attributes(Tail0, #{<<"title">> => Title}), + run(Tail); +run([{attribute_list, Attrs, <<>>, _}|Tail0]) -> + Tail = apply_attributes(Tail0, Attrs), + run(Tail); +run([Block|Tail]) -> + [Block|run(Tail)]. + +%% Find the next block to apply the attributes. +apply_attributes([], _) -> + []; +apply_attributes(AST=[Element0={Type, Attrs0, Content, Ann}|Tail], Attrs) -> + case can_apply(Type) of + drop -> + AST; + skip -> + [Element0|apply_attributes(Tail, Attrs)]; + apply -> + Element = {Type, maps:merge(Attrs0, Attrs), Content, Ann}, + [Element|Tail] + end. + +%% Block macros already come with a mandatory attribute list. +%% Just to play it safe we drop the attributes for now. +can_apply(block_macro) -> drop; +%% If we hit a list item continuation, drop the attributes for now. +can_apply(list_item_continuation) -> drop; +%% We skip attribute lists and alike and let it sort itself out. +can_apply(block_id) -> skip; +can_apply(attribute_list) -> skip; +can_apply(block_title) -> skip; +%% Everything else is a block. +can_apply(_) -> apply. + +-ifdef(TEST). +attribute_list_test() -> + AST0 = [ + {attribute_list, #{ + 0 => <<"width=400">>, + <<"width">> => <<"400">> + }, <<>>, #{line => 1}}, + {listing_block, #{}, <<"Hello!">>, #{line => 2}} + ], + AST = [ + {listing_block, #{ + 0 => <<"width=400">>, + <<"width">> => <<"400">> + }, <<"Hello!">>, #{line => 2}} + ], + AST = run(AST0), + ok. + +block_id_test() -> + AST0 = [ + {block_id, #{ + id => <<"cowboy_req">> + }, <<>>, #{line => 1}}, + {listing_block, #{}, <<"Hello!">>, #{line => 2}} + ], + AST = [ + {listing_block, #{ + <<"id">> => <<"cowboy_req">> + }, <<"Hello!">>, #{line => 2}} + ], + AST = run(AST0), + ok. + +block_title_test() -> + AST0 = [ + {block_title, #{}, <<"Title">>, #{line => 1}}, + {listing_block, #{}, <<"Hello!">>, #{line => 2}} + ], + AST = [ + {listing_block, #{ + <<"title">> => <<"Title">> + }, <<"Hello!">>, #{line => 2}} + ], + AST = run(AST0), + ok. +-endif. |