File 4434-edoc-Add-utility-to-convert-html-to-markdo... of Package erlang

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File 4434-edoc-Add-utility-to-convert-html-to-markdown.patch of Package erlang (Revision 54461a2357af3de1f765489d2fd0ee14)

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From 0e0283d51e78b6e29f6de967ddfd19744183c8b8 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Tue, 16 Jan 2024 16:08:37 +0100
Subject: [PATCH 4/4] edoc: Add utility to convert html to markdown

---
 lib/edoc/src/Makefile                  |    3 +-
 lib/edoc/src/edoc.app.src              |    5 +-
 lib/edoc/src/edoc_html_to_markdown.erl | 1225 ++++++++++++++++++++++++
 3 files changed, 1230 insertions(+), 3 deletions(-)
 create mode 100644 lib/edoc/src/edoc_html_to_markdown.erl

diff --git a/lib/edoc/src/Makefile b/lib/edoc/src/Makefile
index a455662049..72930776c3 100644
--- a/lib/edoc/src/Makefile
+++ b/lib/edoc/src/Makefile
@@ -29,7 +29,8 @@ SOURCES= \
 	edoc.erl edoc_cli.erl edoc_data.erl edoc_doclet.erl edoc_doclet_chunks.erl \
 	edoc_extract.erl edoc_layout.erl edoc_layout_chunks.erl \
 	edoc_lib.erl edoc_macros.erl edoc_parser.erl edoc_refs.erl edoc_report.erl \
-	edoc_run.erl edoc_scanner.erl edoc_specs.erl edoc_tags.erl edoc_types.erl edoc_wiki.erl
+	edoc_run.erl edoc_scanner.erl edoc_specs.erl edoc_tags.erl edoc_types.erl edoc_wiki.erl \
+	edoc_html_to_markdown.erl
 
 OBJECTS=$(SOURCES:%.erl=$(EBIN)/%.$(EMULATOR)) $(APP_TARGET) $(APPUP_TARGET)
 
diff --git a/lib/edoc/src/edoc.app.src b/lib/edoc/src/edoc.app.src
index 079be93e9e..567b5b2ebb 100644
--- a/lib/edoc/src/edoc.app.src
+++ b/lib/edoc/src/edoc.app.src
@@ -10,6 +10,7 @@
 	 edoc_doclet,
 	 edoc_doclet_chunks,
 	 edoc_extract,
+ edoc_html_to_markdown,
 	 edoc_layout,
 	 edoc_layout_chunks,
 	 edoc_lib,
@@ -26,6 +27,6 @@
 {registered,[]},
 {applications, [compiler, kernel, stdlib, syntax_tools]},
 {env, []},
- {runtime_dependencies, ["xmerl-1.3.7", "syntax_tools-2.0", "stdlib-3.15",
-			 "kernel-3.0", "inets-5.10", "erts-6.0"]}
+ {runtime_dependencies, ["xmerl-1.3.7", "syntax_tools-2.0", "stdlib-4.0",
+			 "kernel-7.0", "inets-5.10", "erts-11.0"]}
 ]}.
diff --git a/lib/edoc/src/edoc_html_to_markdown.erl b/lib/edoc/src/edoc_html_to_markdown.erl
new file mode 100644
index 0000000000..b5b7e7d0ef
--- /dev/null
+++ b/lib/edoc/src/edoc_html_to_markdown.erl
@@ -0,0 +1,1225 @@
+%% -*- erlang -*-
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2020-2023. All Rights Reserved.
+%%
+%% 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.
+%%
+%% %CopyrightEnd%
+
+%% Does translation of Erlang XML docs to EEP-48 doc chunks and
+%% EEP-48 doc chunks to ex_doc markdown.
+%%----------------------------------------------------------------------
+-module(edoc_html_to_markdown).
+-feature(maybe_expr, enable).
+
+-if(?OTP_RELEASE < 27).
+-define(NO_DOCS, true).
+-endif.
+
+-ifndef(NO_DOCS).
+-moduledoc """
+This module can convert application/html+erlang style documentation to markdown.
+""".
+-endif.
+
+-include_lib("kernel/include/eep48.hrl").
+
+-export([convert_html/2, convert_xml/2, convert_html/3, convert_xml/3]).
+
+-ifndef(NO_DOCS).
+-doc """
+Convert [`application/html+erlang`](`t:shell_docs:chunk_element/0`) to Markdown
+suitable for usage with ExDoc.
+
+The `Application` and `Module` argument are used to correctly generate links.
+""".
+-endif.
+-spec convert_html(Application :: atom(),
+ Module :: module(),
+ Html :: shell_docs:chunk_elements()) ->
+ unicode:chardata().
+convert_html(Application, Module, Html) when is_atom(Module), is_atom(Application) ->
+ put(module, Module),
+ put(application, atom_to_binary(Application)),
+ render_docs(shell_docs:normalize(Html)).
+
+%% Internal functions
+-ifndef(NO_DOCS).
+-doc false.
+-endif.
+convert_html(Application, Html) when is_atom(Application) ->
+ put(module, ''),
+ put(application, atom_to_binary(Application)),
+ render_docs(shell_docs:normalize(Html)).
+
+-ifndef(NO_DOCS).
+-doc false.
+-endif.
+convert_xml(Application, Binary) when is_atom(Application) ->
+ convert_xml(Application, '', Binary).
+-ifndef(NO_DOCS).
+-doc false.
+-endif.
+convert_xml(Application, Module, Binary) when is_atom(Application), is_atom(Module) ->
+ put(application, atom_to_binary(Application)),
+ case xmerl_sax_parser:stream(Binary, [{event_fun, fun event/3},
+ {event_state, initial_state()}]) of
+ {ok, Tree, _} ->
+ convert_html(Application, Module, transform(get_dom(Tree), []))
+ end.
+
+%%
+%% The code below is taken from shell_docs and modified to emit Markdown instead
+%%
+-record(config, {docs, current = undefined }).
+
+-define(ALL_ELEMENTS, [
+ a,
+ p,
+ 'div',
+ br,
+ h1,
+ h2,
+ h3,
+ h4,
+ h5,
+ h6,
+ hr,
+ i,
+ b,
+ em,
+ strong,
+ pre,
+ code,
+ ul,
+ ol,
+ li,
+ dl,
+ dt,
+ dd,
+ table,
+ tr,
+ td
+]).
+%% inline elements are:
+-define(INLINE, [i, b, em, strong, code, a]).
+-define(IS_INLINE(ELEM),
+ (((ELEM) =:= a) orelse ((ELEM) =:= code) orelse
+ ((ELEM) =:= i) orelse ((ELEM) =:= em) orelse
+ ((ELEM) =:= b) orelse ((ELEM) =:= strong))
+).
+%% non-inline elements are:
+-define(BLOCK, [p, 'div', pre, br, ul, ol, li, dl, dt, dd, h1, h2, h3, h4, h5, h6, hr, table, tr, td]).
+-define(IS_BLOCK(ELEM), not ?IS_INLINE(ELEM)).
+-define(IS_PRE(ELEM), ((ELEM) =:= pre)).
+-define(IS_HDR(ELEM),
+ (((ELEM) =:= h1) orelse ((ELEM) =:= h2) orelse
+ ((ELEM) =:= h3) orelse ((ELEM) =:= h4) orelse
+ ((ELEM) =:= h5) orelse ((ELEM) =:= h6))).
+
+
+%%% General rendering functions
+render_docs(DocContents) ->
+ render_docs(DocContents, init_config(#docs_v1{ docs = [] }, #{})).
+render_docs(DocContents, #config{} = Config) ->
+ render_docs(DocContents, 0, Config).
+render_docs(DocContents, Ind, D = #config{}) when is_integer(Ind) ->
+ try
+ {Doc, _} = trimnl(render_docs(preprocess_docs(DocContents, D), [], 0, Ind, D)),
+ unicode:characters_to_binary(Doc)
+ catch throw:R:ST ->
+ io:format("Failed to render: ~tp~n",[R]),
+ erlang:raise(throw,R,ST);
+ E:R:ST ->
+ io:format("Failed to render: ~tp~n",[DocContents]),
+ erlang:raise(E,R,ST)
+ end.
+
+%% Merge any anchor with its header
+%% preprocess_docs([{Hdr,Attr,C},{a,[{id,_}] = Id,[]}|T], D) when ?IS_HDR(Hdr) ->
+%% preprocess_docs([{Hdr,Attr ++ Id, C} | T], D);
+%% preprocess_docs([{a,[{id,_}] = Id,[]},{Hdr,Attr,C}|T], D) when ?IS_HDR(Hdr) ->
+%% preprocess_docs([{Hdr,Attr ++ Id, C} | T], D);
+preprocess_docs([{a,[{id,_Id}|_] = AAttr,[]},{Tag,PAttr,C}|T], D)
+ when Tag =:= pre; Tag =:= em; Tag =:= table; Tag =:= code; Tag =:= img ->
+ preprocess_docs([{Tag, AAttr ++ PAttr, C}|T], D);
+preprocess_docs([{Tag,_,_} = H,{a,[{id,_Id}|_],[]} = A|T],D) when ?IS_HDR(Tag) ->
+ preprocess_docs([A, H | T], D);
+preprocess_docs([{a,[{id,Id}|_],[]} = A,{Tag,_,Name} = H|T],D) when ?IS_HDR(Tag) ->
+ case string:equal(render_elink_anchor(Id), render_elink_anchor(Name)) of
+ true ->
+ preprocess_docs([H|T], D);
+ false ->
+ [A | preprocess_docs([H|T], D)]
+ end;
+preprocess_docs([{a,[{id,Id}] = Attr,[]}| T],
+ #config{ current = {{function,Function,Arity},_,_,_,_} } = D) ->
+ maybe
+ %% Remove any anchor that is just function-arity
+ [FunctionString, ArityString] ?= string:split(Id,"-",all),
+ Arity ?= catch binary_to_integer(ArityString),
+ true ?= is_integer(Arity),
+ Function ?= binary_to_atom(FunctionString),
+ preprocess_docs(T, D)
+ else
+ _ ->
+ [{a, Attr, []} | preprocess_docs(T, D)]
+ end;
+preprocess_docs([{Tag,Attr,C}|T], D) ->
+ [{Tag,proplists:delete(ghlink,Attr),preprocess_docs(C, D)}|preprocess_docs(T, D)];
+preprocess_docs([Text|T], D) when is_binary(Text) ->
+ [Text | preprocess_docs(T,D)];
+preprocess_docs([], _) ->
+ [].
+
+-spec init_config(#docs_v1{} | undefined, _) -> #config{}.
+init_config(D, Config) ->
+ #config{docs = D, current = maps:get(current, Config, undefined) }.
+
+render_docs(Elems, State, Pos, Ind, D) when is_list(Elems) ->
+ lists:mapfoldl(
+ fun(Elem, P) ->
+ render_docs(Elem, State, P, Ind, D)
+ end,
+ Pos,
+ Elems
+ );
+render_docs(Elem, State, Pos, Ind, D) ->
+ % io:format("Elem: ~p (~p) (~p,~p)~n",[Elem,State,Pos,Ind]),
+ render_element(Elem, State, Pos, Ind, D).
+
+%%% The function is the main element rendering function
+%%%
+%%% Elem: The current element to process
+%%% Stack: A stack of element names to see where we are in the dom
+%%% Pos: The current print position on the current line
+%%% Ind: How much the text should be indented after a newline
+%%% Config: The renderer's configuration
+%%%
+%%% Each element is responsible for putting new lines AFTER itself
+%%% The indents are done either by render_words when a newline happens
+%%% or when a new element is to be rendered and Pos < Ind.
+%%%
+%%% Any block elements (i.e. p, ul, li etc) are responsible for trimming
+%%% extra new lines. eg. <ul><li>content</li></ul> should only
+%%% have two newlines at the end.
+
+%% render_element({IgnoreMe,_,Content}, State, Pos, Ind,D)
+%% when IgnoreMe =:= a ->
+%% render_docs(Content, State, Pos, Ind,D);
+
+%% Catch h* before the padding is done as they reset padding
+render_element({Tag = h1, Attr, Content}, State, 0 = Pos, _Ind, D) ->
+ {Docs, NewPos} = render_docs(Content, [Tag|State], Pos, 0, D),
+ trimnlnl({["# ", Docs, ial(Attr)], NewPos});
+render_element({Tag = h2, Attr, Content}, State, 0 = Pos, _Ind, D) ->
+ {Docs, NewPos} = render_docs(Content, [Tag|State], Pos, 0, D),
+ trimnlnl({["## ", Docs, ial(Attr)], NewPos});
+render_element({Tag = h3, Attr, Content}, State, Pos, _Ind, D) when Pos =< 2 ->
+ {Docs, NewPos} = render_docs(Content, [Tag|State], Pos, 0, D),
+ trimnlnl({["### ", Docs, ial(Attr)], NewPos});
+render_element({Tag = h4, Attr, Content}, State, Pos, _Ind, D) when Pos =< 2 ->
+ {Docs, NewPos} = render_docs(Content, [Tag|State], Pos, 0, D),
+ trimnlnl({["#### ", Docs, ial(Attr)], NewPos});
+render_element({Tag = h5, Attr, Content}, State, Pos, _Ind, D) when Pos =< 2 ->
+ {Docs, NewPos} = render_docs(Content, [Tag|State], Pos, 0, D),
+ trimnlnl({["##### ", Docs, ial(Attr)], NewPos});
+render_element({Tag = h6, Attr, Content}, State, Pos, _Ind, D) when Pos =< 2 ->
+ {Docs, NewPos} = render_docs(Content, [Tag|State], Pos, 0, D),
+ trimnlnl({["###### ", Docs, ial(Attr)], NewPos});
+render_element({pre, _Attr, _Content} = E, State, Pos, Ind, D) when Pos > Ind ->
+ %% We pad `pre` with two newlines if the previous section did not indent the region.
+ {Docs, NewPos} = render_element(E, State, 0, Ind, D),
+ {["\n\n", Docs], NewPos};
+render_element({br, _Attr, _Content}, [td|_State], Pos, _Ind, _D) ->
+ {" ", Pos + 1};
+render_element({br, _Attr, _Content} = E, State, Pos, Ind, D) when Pos > Ind ->
+ {Docs, NewPos} = render_element(E, State, 0, Ind, D),
+ {[" \n", Docs], NewPos};
+render_element({p, _Attr, _Content} = E, State, Pos, Ind, D) when Pos > Ind ->
+ {Docs, NewPos} = render_element(E, State, 0, Ind, D),
+ {["\n\n", Docs], NewPos};
+render_element({Elem, _Attr, _Content} = E, State, Pos, Ind, D) when Pos > Ind, ?IS_BLOCK(Elem) ->
+ {Docs, NewPos} = render_element(E, State, 0, Ind, D),
+ {["\n", Docs], NewPos};
+render_element({'div', [{class, What}], Content}, State, Pos, Ind, D) ->
+ Type = case What of
+ <<"warning">> -> What;
+ <<"error">> -> What;
+ <<"note">> -> <<"info">>;
+ <<"change">> -> <<"info">>;
+ <<"do">> -> <<"tip">>;
+ <<"dont">> -> <<"error">>
+ end,
+ Title = unicode:characters_to_binary([string:titlecase(What), " ",ial([{class,Type}])]),
+ {Header, 0} = render_element({h4, [], [Title]}, State, Pos, Ind, D),
+ {Docs, 0} = render_element({'div', [], Content}, ['div' | State], 0, 0, D),
+ trimnlnl([pad(Ind - Pos), "> ", string:trim(Header), "\n",
+ [[pad(Ind), string:trim(["> ",Line]),"\n"] || Line <- string:split([trim(Docs)],"\n",all)]]);
+render_element({Tag, _Attr, Content}, State, Pos, Ind, D) when Tag =:= p; Tag =:= 'div' ->
+ trimnlnl(render_docs(Content, [Tag | State], Pos, Ind, D));
+%% render_element({a, [{id,_Id}|_], []} = A, State, Pos, Ind, D) when Pos > 0 ->
+%% {Docs, NewPos} = render_element(A, State, 0, Ind, D),
+%% {["\n",Docs], NewPos};
+render_element(Elem, State, Pos, Ind, D) when Pos < Ind ->
+ {Docs, NewPos} = render_element(Elem, State, Ind, Ind, D),
+ {[pad(Ind - Pos), Docs], NewPos};
+render_element({a, Ids, []}, _State, Pos, _Ind, _D) ->
+ trimnl({[["[]()",ial([{id,render_elink_anchor(Id)}])] || {id,Id} <- Ids], Pos});
+render_element({a, Attr, Content}, State, Pos, Ind, D) ->
+ {Docs, NewPos} = render_docs(Content, [a|State], Pos, Ind, D),
+ Id =
+ case proplists:get_all_values(id, Attr) of
+ [] -> "";
+ [IdStr] -> ial([{id,IdStr}])
+ end,
+ {[render_link(Attr, Docs),Id],NewPos};
+render_element({code, _, Content}, [pre | _] = State, Pos, Ind, D) ->
+ %% When code is within a pre we don't emit any underline
+ render_docs(Content, [code | State], Pos, Ind, D);
+%% Faulty {code,..} generated by diameter containing links.
+%% we split them into multiple code segments.
+render_element({code,CodeAttr,[Content,{a,AAttr,AContent}|H]}, State, Pos, Ind, D) ->
+ AttrWithoutId = proplists:delete(id,CodeAttr),
+ render_docs([{code,AttrWithoutId,[Content]},{a,AAttr,[{code,AttrWithoutId,AContent}]},
+ {code,CodeAttr,H}], State, Pos, Ind, D);
+render_element({code,_CodeAttr,[]}, _State, Pos, _Ind, _D) ->
+ {"", Pos};
+render_element({code, Attr, Content}, State, Pos, Ind, D) ->
+ {Docs, NewPos} = render_docs(Content, [code | State], Pos, Ind, D),
+
+ IsDocumented = fun(What, #docs_v1{ docs = V1Docs }) ->
+ case lists:keyfind(What, 1, V1Docs) of
+ {What, _, _, #{}, _} ->
+ true;
+ _ ->
+ false
+ end
+ end,
+
+ %% Try to convert code segments that refer to types but don't have a link
+ %% to have the correct prefix. i.e. <c>byte()</c> should be `t:byte()`.
+ TypedDocs =
+ maybe
+ %% We do not do any transform if we are in an `a` already
+ true ?= State =:= [] orelse a =/= hd(State),
+ {ok, T, _} ?= erl_scan:string(unicode:characters_to_list([Docs,"."]), {1, 1}),
+ {ok, [{call,_,{atom,_,Name},Args}]} ?=
+ case erl_parse:parse_exprs(T) of
+ {ok, [{op,A,'/',F,{integer,_,NumArgs}}]} ->
+ %% Translate any byte/0 to byte()
+ {ok,[{call,A,F,lists:duplicate(NumArgs,a)}]};
+ Else ->
+ Else
+ end,
+ case IsDocumented({function, Name, length(Args)}, D#config.docs) orelse
+ erl_internal:bif(Name, length(Args))
+ of
+ true when length(Args) =:= 0 ->
+ lists:concat([io_lib:write_atom(Name),"/",length(Args)]);
+ true ->
+ %% This is a function, so return code as is
+ {lists:concat(["[`",Docs,"`](`",io_lib:write_atom(Name),"/",length(Args),"`)"]), NewPos};
+ false when length(Args) =:= 1,
+ element(1, hd(Args)) =:= integer,
+ element(3, hd(Args)) =:= 3 ->
+ %% Is a foo(3) link
+ try
+ Name:module_info(), %% Check if module exists
+ NameStr = io_lib:write_atom(Name),
+ {["`m:",NameStr,"`"], Pos + string:length(NameStr)}
+ catch error:undef ->
+ Docs
+ end;
+ false when length(Args) =:= 1,
+ element(1, hd(Args)) =:= integer,
+ element(3, hd(Args)) =:= 1 ->
+ %% Is a foo(1) link, i.e. a seecom
+ NameStr = io_lib:write_atom(Name),
+ {["[",NameStr,"](",NameStr,"_cmd.md)"], Pos + string:length(NameStr)};
+ false ->
+ try
+ %% This is an op type (such as <c>=:=/2</c>)
+ erl_internal:op_type(Name, length(Args)),
+ {lists:concat(["[`",Docs,"`](`erlang:",io_lib:write_atom(Name),"/",length(Args),"`)"]), NewPos}
+ catch error:function_clause ->
+ case IsDocumented({type,Name,length(Args)}, D#config.docs) orelse
+ erl_internal:is_type(Name,length(Args)) of
+ true when length(Args) =:= 0 ->
+ lists:concat(["t:",io_lib:write_atom(Name),"/",length(Args)]);
+ true ->
+ %% This is a type, add type prefix
+ {lists:concat(["[`",Docs,"`](`t:",io_lib:write_atom(Name),"/",length(Args),"`)"]), NewPos};
+ false ->
+ case IsDocumented({callback,Name,length(Args)}, D#config.docs) of
+ true ->
+ %% This is a callback
+ {lists:concat(["[`",Docs,"`](`c:",io_lib:write_atom(Name),"/",length(Args),"`)"]), NewPos};
+ false ->
+ %% This is not a type, nor a function, nor a callback
+ Docs
+ end
+ end
+ end
+ end
+ else
+ %% Could be a remote type erlang:message_queue_data()
+ {ok, [{call,_,{remote,_,{atom,_,RM},{atom,_,RF}},RArgs}]} ->
+ case code:get_doc(RM) of
+ {ok, RemoteDocs} ->
+ case IsDocumented({function,RF,length(RArgs)}, RemoteDocs) of
+ true ->
+ %% This is a remote function
+ Docs;
+ false ->
+ case IsDocumented({type,RF,length(RArgs)}, RemoteDocs) of
+ true ->
+ %% This is a valid remote type
+ {lists:concat(
+ ["[`",Docs,"`](`t:",io_lib:write_atom(RM),":",
+ io_lib:write_atom(RF),"/",length(RArgs),"`)"]),
+ NewPos};
+ false ->
+ Docs
+ end
+ end;
+ _ ->
+ %% Could not fetch docs
+ Docs
+ end;
+ %% Could be a callback Module:init()
+ {ok, [{call,_,{remote,_,{var,_,_RM},{atom,_,RF}},RArgs}]} ->
+ case IsDocumented({callback,RF,length(RArgs)}, D#config.docs) of
+ true ->
+ %% This is a callback
+ {lists:concat(["[`",Docs,"`](`c:",io_lib:write_atom(RF),"/",length(RArgs),"`)"]), NewPos};
+ false ->
+ Docs
+ end;
+ false ->
+ %% We are in a link already, maybe strip trailing (1/3)
+ case re:run(Docs, "^([a-z_]+)\$[13]\$$",[{capture,all_but_first,list}, unicode]) of
+ {match,[MaybeMod]} ->
+ case code:which(list_to_atom(MaybeMod)) of
+ non_existing ->
+ Docs;
+ _ ->
+ MaybeMod
+ end;
+ _ ->
+ Docs
+ end;
+ _ ->
+ %% Could not parse
+ Docs
+ end,
+ if is_tuple(TypedDocs) ->
+ TypedDocs;
+ true ->
+ case re:run(TypedDocs, "`+", [global,unicode]) of
+ nomatch ->
+ {["`", TypedDocs, "`", ial(Attr)], NewPos};
+ {match,Matches} ->
+ LargestMatch = lists:max([Size || [{_, Size}] <- Matches]),
+ Ticks = lists:duplicate(LargestMatch+1,$`),
+ {[Ticks," ", TypedDocs, " ",Ticks,ial(Attr)], NewPos}
+ end
+ end;
+render_element({em, Attr, Content}, State, Pos, Ind, D) ->
+ render_element({i, Attr, Content}, State, Pos, Ind, D);
+render_element({i, Attr, Content}, State, Pos, Ind, D) ->
+ {Docs, NewPos} = render_docs(Content, [i | State], Pos, Ind, D),
+ case lists:member(pre, State) of
+ true ->
+ {[Docs], NewPos};
+ false ->
+ {["*", Docs, "*",ial(Attr)], NewPos}
+ end;
+render_element({hr, [], []}, _State, Pos, _Ind, _D) ->
+ {"---\n", Pos};
+render_element({br, [], []}, _State, Pos, _Ind, _D) ->
+ {"", Pos};
+render_element({strong, Attr, Content}, State, Pos, Ind, D) ->
+ render_element({b, Attr, Content}, State, Pos, Ind, D);
+render_element({b, Attr, Content}, State, Pos, Ind, D) ->
+ {Docs, NewPos} = render_docs(Content, State, Pos, Ind, D),
+ case lists:member(pre, State) of
+ true ->
+ {[Docs], NewPos};
+ false ->
+ {["__", Docs, "__",ial(Attr)], NewPos}
+ end;
+render_element({pre, [], [{code,Attr,Content}]}, State, Pos, Ind, D) ->
+ render_element({pre, Attr, Content}, State, Pos, Ind, D);
+render_element({pre, Attr, Content}, State, Pos, Ind, D) ->
+ %% This is a pre without any links or emphasis, so we use markdown
+
+ %% For pre we make sure to respect the newlines in pre
+ {Docs, _} = trimnl(render_docs(strip_tags(Content), [pre | State], Pos, Ind, D)),
+ Type =
+ case unicode:characters_to_binary(proplists:get_value(type, Attr, "text")) of
+ <<"none">> -> "text";
+ <<"text">> -> "text";
+ <<"erlang">> -> "erlang";
+ <<"erl">> -> "erlang";
+ <<"erl-repl">> -> "erlang";
+ <<"c">> -> "c"
+ end,
+ IdAttr = proplists:delete(type, Attr),
+ trimnlnl(["```",Type,"\n", pad(Ind), Docs, pad(Ind), "```",
+ [["\n",pad(Ind),ial(IdAttr)] || IdAttr =/= []]]);
+render_element({ul, [{class, <<"types">>}], _Content}, _State, Pos, _Ind, _D) ->
+ case _D#config.current of
+ {_, _, _, _, #{ specs := _}} ->
+ {"", Pos};
+ _ ->
+ {Docs, _} = render_docs(_Content, [types | _State], 0, _Ind, _D),
+ trimnlnl(Docs)
+ end;
+render_element({li, Attr, Content}, [types | _] = State, Pos, Ind, C) ->
+ Doc =
+ case {proplists:get_value(name, Attr), proplists:get_value(class, Attr)} of
+ {undefined, Class} when Class =:= undefined; Class =:= <<"type">> ->
+ %% Inline html for types
+ render_docs(Content ++ [<<" ">>], [type | State], Pos, Ind, C);
+ {_, <<"description">>} ->
+ %% Inline html for type descriptions
+ render_docs(Content ++ [<<" ">>], [type | State], Pos, Ind + 2, C);
+ {Name, _} ->
+ %% Try to render from type metadata
+ case render_type_signature(binary_to_atom(Name), C) of
+ undefined when Content =:= [] ->
+ %% Failed and no content, emit place-holder
+ {["```erlang\n-type ", Name, "() :: term().```"], 0};
+ undefined ->
+ %% Failed with metadata, render the content
+ render_docs(Content ++ [<<" ">>], [type | State], Pos, Ind, C);
+ Type ->
+ %% Emit the erl_pp typespec
+ {["```erlang\n", Type, "```"], 0}
+ end
+ end,
+ trimnl(Doc);
+render_element({ul, [], Content}, State, Pos, Ind, D) ->
+ trimnlnl(render_docs(Content, [ul | State], Pos, Ind, D));
+render_element({ol, [], Content}, State, Pos, Ind, D) ->
+ trimnlnl(render_docs(Content, [ol | State], Pos, Ind, D));
+render_element({li, [], Content}, [ul | _] = State, Pos, Ind, D) ->
+ {Docs, _NewPos} = render_docs(Content, [li | State], Pos + 2, Ind + 2, D),
+ trimnl(["* ", Docs]);
+render_element({li, [], Content}, [ol | _] = State, Pos, Ind, D) ->
+ {Docs, _NewPos} = render_docs(Content, [li | State], Pos + 2, Ind + 2, D),
+ trimnl(["1. ", Docs]);
+render_element({dl, [], [{dt,DTAttr,DTContent}, {dd,[],DDContent} | Content]}, State, Pos, Ind, D) ->
+ Since = proplists:get_value(since, DTAttr),
+ {DTDocs, _DTNewPos} =
+ render_docs(
+ [{b, [], DTContent}],
+ [li, dl | State],
+ Pos + 2,
+ Ind + 2,
+ D),
+ Ids = [{id,Id} || {id,Id} <- DTAttr],
+ DTDocsWAnchors = case Ids of
+ [] -> trim(DTDocs);
+ Ids -> [trim(DTDocs),ial(Ids)]
+ end,
+ {DDDocs, DDNewPos} = render_docs(DDContent, [li, dd | State], 0, Ind + 2, D),
+ {Docs, NewPos} =
+ case string:find(DTDocs, "\n") of
+ nomatch when Since =:= undefined, is_binary(hd(DDContent)) orelse element(1,hd(DDContent)) =/= pre ->
+ trimnlnl({["* ", trim(DTDocsWAnchors), " - ", string:trim(string:trim(DDDocs, both, "\n"), leading, " ")], DDNewPos});
+ _ ->
+ trimnlnl({["* ", trim(DTDocsWAnchors), [["(Since ",Since,")"] || Since =/= undefined]," \n",
+ DDDocs], DDNewPos})
+ end,
+ {DLDocs, DLPos} = render_element({dl, [], Content}, State, NewPos, Ind, D),
+ {[Docs,DLDocs], DLPos};
+render_element({dl, [], []}, _State, Pos, _Ind, _D) ->
+ {"", Pos};
+render_element({table, Attr, Rows}, State, Pos, Ind, D) ->
+ [{tr,_,Head} | RowsNoCaption] = [Row || {tr,_,_} = Row <- Rows],
+ {TableDocs, TablePos} =
+ trimnl(render_docs([{th, [], Head} | RowsNoCaption], [table|State], Pos, Ind, D)),
+ {CaptionDocs, CaptionPos} =
+ render_docs([{em, [], [<<"Table: ">>, C]} || {caption,_,C} <- Rows, not string:equal(C,"")],
+ [table|State], TablePos, Ind, D),
+ trimnlnl({[TableDocs, [[pad(Ind),ial(proplists:delete(align,Attr)),"\n\n"] || Attr =/= []], CaptionDocs], CaptionPos});
+render_element({th, [], Head}, State, _Pos, _Ind, D) ->
+ Header =
+ [begin {Docs, _} = render_docs(Td, [th|State], 0, 0, D),
+ {["| ", Docs, " "], ["|-", lists:duplicate(string:length(Docs), $-), "-"]}
+ end || Td <- Head],
+ trimnl({[[ Docs || {Docs,_} <- Header ], "|\n",
+ [ Lines || {_, Lines} <- Header ], "|\n"], 0});
+render_element({tr, [], Row}, State, _Pos, _Ind, D) ->
+ Rows =
+ [begin {Docs, _} = render_docs(Td, [tr|State], 0, 0, D),
+ ["| ", Docs, " "]
+ end || Td <- Row],
+ trimnl({[ Rows, "|"], 0});
+render_element({td, _, TDContent}, State, Pos, Ind, D) ->
+ render_docs(TDContent, [td|State], Pos, Ind, D);
+render_element({img,Attr,Content}, _State, Pos, _Ind, _D) ->
+ Caption = case lists:keyfind(caption, 1, Content) of
+ false -> "";
+ {caption, _, C} ->
+ C
+ end,
+ trimnlnl({["![",Caption,"](",filename:join("assets",filename:basename(proplists:get_value(file,Attr))),
+ " \"",Caption,"\")",ial(proplists:delete(file, Attr)),"\n"], Pos});
+render_element({quote, [], Content}, State, _Pos, Ind, D) ->
+ {Docs, 0} = render_element({'div', [], Content}, ['div' | State], 0, 0, D),
+ trimnlnl([[pad(Ind), "> ",Line,"\n"] || Line <- string:split(trim(Docs),"\n",all)]);
+render_element(B, State, Pos, Ind, _D) when is_binary(B) ->
+ %% Indent the string correctly
+ Pre = re:replace(B,"\n",nlpad(Ind),[global,unicode]),
+
+ Str =
+ case State of
+ [pre | _] ->
+ Pre;
+ [code | _] ->
+ Pre;
+ [h4 | _] ->
+ Pre;
+ _ ->
+ EscapeChars = [
+ "\\",
+ "`",
+ "{",
+ "}",
+ "!"|
+ [["|"] || lists:member(table,State)]
+ ],
+ lists:foldl(
+ fun({Pat, Subst}, S) -> re:replace(S, Pat, Subst, [global,unicode]) end,
+ B,
+ [{["(", lists:join($|, [["\\", C] || C <- EscapeChars]), ")"], "\\\\\\1"},
+ %% [^S\r\n] == All whitespace except \r\n
+ {"(\n\\s*[0-9]+)\\.([^S\r\n])", "\\1\\\\.\\2"}, %% \n1. -> 1\.
+ {"^(\\s*[0-9]+)\\.([^S\r\n])", "\\1\\\\.\\2"}, %% ^1. -> 1\.
+ {"(\n\\s*)\\*([^S\r\n])", "\\1\\\\*\\2"}, %% \n* -> \*
+ {"^(\\s*)\\*([^S\r\n])", "\\1\\\\*\\2"}, %% ^* -> \*
+ {"(\n\\s*)\\-([^S\r\n])", "\\1\\\\-\\2"}, %% \n- -> \-
+ {"^(\\s*)\\-([^S\r\n])", "\\1\\\\-\\2"}, %% ^- -> \-
+ {"(\n\\s*)\\+([^S\r\n])", "\\1\\\\+\\2"}, %% \n+ -> \+
+ {"^(\\s*)\\+([^S\r\n])", "\\1\\\\+\\2"}, %% ^+ -> \+
+ {"(\n\\s*)\\#([^S\r\n])", "\\1\\\\#\\2"}, %% \n# -> \#
+ {"^(\\s*)\\#([^S\r\n])", "\\1\\\\#\\2"}, %% ^# -> \#
+ {"\\[([^]]+\\])", "\\\\[\\1"}, %% [..] -> \[..]
+ {"<(http[^>]+>)", "\\\\<\\1"}, %% <..> -> \<..>
+ {"(\s)_([^_]+_\s)", "\\1\\\\_\\2"}] %% _.._ -> \_.._
+ )
+ end,
+ {Str, Pos + lastline(Str)};
+render_element({Tag, Attr, Content}, State, Pos, Ind, D) ->
+ case lists:member(Tag, ?ALL_ELEMENTS) of
+ true ->
+ throw({unhandled_element, Tag, Attr, Content});
+ false ->
+ throw({unknown_element, Tag, Attr, Content}),
+ ok
+ end,
+ render_docs(Content, State, Pos, Ind, D).
+
+
+render_link(Attr, Docs) ->
+ render_link(Docs, proplists:get_value(rel, Attr), proplists:get_value(href, Attr)).
+
+render_link(Docs, undefined, Href) when Href =/= undefined ->
+ %% This types of links are usually from edoc, but could also be
+ %% <url> from erl_docgen
+ case Href of
+ <<"overview-summary.html",Rest/binary>> ->
+ %% This is an edoc overview anchor
+ Anchor = lists:last(string:split(Rest,"#")),
+ ["[", Docs, "](chapter.md#", render_link_anchor(Anchor), ")"];
+ Href ->
+ ["[", Docs, "](", Href, ")"]
+ end;
+render_link(Docs, <<"https://erlang.org/doc/link/seemfa">>, Href) ->
+ MFA = case string:split(Href, ":") of
+ [_App, HrefMFA] -> HrefMFA;
+ [Href] -> Href
+ end,
+ [Mod, FA] = case string:split(MFA, "#") of
+ [<<>>, MFANoAnchor] -> ["", MFANoAnchor];
+ [Module, FunArgs] ->
+ case string:equal(atom_to_list(get(module)), Module) of
+ true ->
+ ["",FunArgs];
+ false ->
+ [[Module,":"],FunArgs]
+ end
+ end,
+ {Prefix, Func, Arity} =
+ case string:split(FA, "/") of
+ [<<"Module:", F/binary>>, A] ->
+ {"c:",F, A};
+ [<<"Mod:", F/binary>>, A] ->
+ {"c:",F, A};
+ [F, A] ->
+ {"", F, A}
+ end,
+ Link = [Mod,Func,"/",Arity],
+ case string:equal(Docs, Link) orelse string:equal(Docs, ["`",Link,"`"]) of
+ true ->
+ ["`",Prefix,Link,"`"];
+ false ->
+ [
+ "[", Docs, "](`",Prefix,Link,"`)"
+ ]
+ end;
+render_link(Docs, <<"https://erlang.org/doc/link/seetype">>, Href) ->
+ MFA = case string:split(Href, ":") of
+ [_App, HrefMFA] -> HrefMFA;
+ [Href] -> Href
+ end,
+ [ModDocs, Mod, FA] =
+ case string:split(MFA, "#") of
+ [<<>>, MFANoAnchor] -> [get(module), "", MFANoAnchor];
+ [Module, FunArgs] ->
+ case string:equal(atom_to_list(get(module)), Module) of
+ true ->
+ [get(module), "",FunArgs];
+ false ->
+ [binary_to_atom(Module), [Module,":"],FunArgs]
+ end
+ end,
+ {Func, Arity} =
+ case string:split(FA, "/") of
+ [FA] ->
+ {ok, #docs_v1{ docs = Ds}} = code:get_doc(ModDocs),
+ App = get(application),
+ case lists:search(
+ fun(E) ->
+ case element(1, E) of
+ {type, Type, _} ->
+ string:equal(atom_to_list(Type), FA);
+ _ ->
+ false
+ end
+ end, lists:sort(Ds)) of
+ {value, {{type,_,TypeArity},_,_,_,_}} ->
+ {FA, integer_to_list(TypeArity)};
+ _Else when App =/= "wx" ->
+ io:format("Could not find find type: ~p~n",
+ [[Mod, FA]]),
+ exit({Mod, FA});
+ _Else ->
+ {FA,"0"}
+ end;
+ [F, A] ->
+ {F, A}
+ end,
+ Link = [Mod,Func,"/",Arity],
+ ZeroLink = [Mod,Func,"()"],
+ case (string:equal(Docs, Link) orelse string:equal(Docs, ["`",Link,"`"])) orelse
+ ((string:equal(Docs, ZeroLink) orelse string:equal(Docs, ["`",ZeroLink,"`"])) andalso Arity =:= "0")
+ of
+ true ->
+ ["`t:", Link, "`"];
+ false ->
+ [
+ "[", Docs, "](`t:", Link,"`)"
+ ]
+ end;
+render_link(Docs, <<"https://erlang.org/doc/link/seeerl">>,
+ Href = <<"erl_docgen:doc_storage">>) ->
+ ["[",Docs,"](`e:",Href,".md`)"];
+render_link(Docs, <<"https://erlang.org/doc/link/seeerl">>,
+ <<"erl_docgen:doc_storage.html">>) ->
+ ["[",Docs,"](`e:erl_docgen:doc_storage.md`)"];
+render_link(Docs, <<"https://erlang.org/doc/link/seeerl">>,
+ <<"edoc:edoc_cmd">>) ->
+ ["[",Docs,"](edoc_cmd.md)"];
+render_link(Docs, <<"https://erlang.org/doc/link/seeerl">>, Href) ->
+ ModAnchor =
+ case string:split(Href, ":") of
+ [MA] ->
+ MA;
+ [_App, MA] ->
+ MA
+ end,
+ ModFixedAnchor =
+ case string:split(ModAnchor, "#") of
+ [ModAnchor] ->
+ ModAnchor;
+ [M, A] ->
+ [M, "#", render_elink_anchor(A)]
+ end,
+ DocsNoMan3 = re:replace(Docs,["(`?",ModFixedAnchor,")\$3\$(`?)"],"\\1\\2"),
+ case string:equal(DocsNoMan3, ModFixedAnchor) orelse
+ string:equal(DocsNoMan3, ["`",ModFixedAnchor,"`"]) of
+ true ->
+ ["`m:", ModFixedAnchor, "`"];
+ false ->
+ ["[", Docs, "](`m:", ModFixedAnchor, "`)"]
+ end;
+render_link(Docs, <<"https://erlang.org/doc/link/seeguide">>, Href) ->
+ CurrentApplication = unicode:characters_to_binary(get(application)),
+ RemoveSystemApp = fun(<<"system/general_info",_/binary>>) ->
+ <<"general_info">>;
+ (<<"system",_/binary>>) ->
+ <<"system">>;
+ (Else) ->
+ Else
+ end,
+ case string:lexemes(Href, ":#") of
+ [App, <<"index">>] when App =:= CurrentApplication ->
+ ["[", Docs, "](index.html)"];
+ [App, <<"index">>] ->
+ ["[", Docs, "](`e:",RemoveSystemApp(App),":index.html`)"];
+ [App, Guide] when App =:= CurrentApplication ->
+ ["[", Docs, "](",string:lowercase(Guide),".md)"];
+ [App, Guide, Anchor] when App =:= CurrentApplication ->
+ ["[", Docs, "](",string:lowercase(Guide),".md#",
+ render_elink_anchor(Anchor),")"];
+ [App, Guide] ->
+ ["[", Docs, "](`e:",RemoveSystemApp(App),":",string:lowercase(Guide),".md`)"];
+ [App, Guide, Anchor] ->
+ ["[", Docs, "](`e:",RemoveSystemApp(App),":",string:lowercase(Guide),".md#",
+ render_elink_anchor(Anchor),"`)"]
+ end;
+render_link(Docs, Rel, Href)
+ when Rel =:= <<"https://erlang.org/doc/link/seecref">>;
+ Rel =:= <<"https://erlang.org/doc/link/seecom">>;
+ Rel =:= <<"https://erlang.org/doc/link/seeapp">> ->
+ CurrentApplication = unicode:characters_to_binary(get(application)),
+ Postfix = case Rel of
+ <<"https://erlang.org/doc/link/seecom">> ->
+ "_cmd";
+ <<"https://erlang.org/doc/link/seeapp">> ->
+ "_app";
+ _ ->
+ ""
+ end,
+ AddPostfix = fun(Guide) ->
+ string:lowercase(
+ case string:prefix(string:reverse(Guide),
+ string:reverse(Postfix)) of
+ nomatch ->
+ [Guide,Postfix];
+ _ ->
+ Guide
+ end)
+ end,
+ case string:lexemes(Href, ":#") of
+ [App, <<"index">>] when App =:= CurrentApplication ->
+ ["[", Docs, "](index.html)"];
+ [App, <<"index">>] ->
+ ["[", Docs, "](`e:",App,":index.html`)"];
+ [App, Guide] when App =:= CurrentApplication ->
+ ["[", Docs, "](",AddPostfix(Guide),".md)"];
+ [App, Guide, Anchor] when App =:= CurrentApplication ->
+ ["[", Docs, "](",AddPostfix(Guide),".md#",
+ render_elink_anchor(Anchor),")"];
+ [App, Guide] ->
+ ["[", Docs, "](`e:",App,":",AddPostfix(Guide),".md`)"];
+ [App, Guide, Anchor] ->
+ ["[", Docs, "](`e:",App,":",AddPostfix(Guide),".md#",
+ render_elink_anchor(Anchor),"`)"]
+ end;
+render_link(Docs, <<"https://erlang.org/doc/link/seefile">>, Href) ->
+ CurrentApplication = unicode:characters_to_binary(get(application)),
+ MaybeAddExtension = fun(G) ->
+ string:lowercase(
+ case string:equal(filename:extension(G),"") of
+ true -> [G,".md"];
+ _ -> G
+ end)
+ end,
+ case string:lexemes(Href, ":#") of
+ [App, Guide] when App =:= CurrentApplication, App =:= <<"jinterface">> ->
+ ["[", Docs, "](assets/",Guide,".html)"];
+ [App, Guide, Anchor] when App =:= CurrentApplication, App =:= <<"jinterface">> ->
+ ["[", Docs, "](assets/",Guide,".html#",render_link_anchor(Anchor),")"];
+ [App, Guide] when App =:= CurrentApplication ->
+ ["[", Docs, "](",MaybeAddExtension(Guide),")"];
+ [App, Guide, Anchor] when App =:= CurrentApplication ->
+ ["[", Docs, "](",MaybeAddExtension(Guide),"#",render_link_anchor(Anchor),")"];
+ [App, Guide] ->
+ ["[", Docs, "](`e:",App,":",MaybeAddExtension(Guide),"`)"];
+ [App, Guide, Anchor] ->
+ ["[", Docs, "](`e:",App,":",MaybeAddExtension(Guide),
+ "#",render_link_anchor(Anchor),"`)"]
+ end;
+render_link(Docs, _Rel, _Href) ->
+ Docs.
+
+render_elink_anchor(Anchor) ->
+ render_link_anchor(
+ lists:foldl(
+ fun({Re,Sub}, Str) -> re:replace(Str, Re, Sub, [global, unicode]) end,
+ Anchor,
+ [{" ","-"},{"(--|\\.)","-"}, {"(^-|-$)",""}])).
+
+render_link_anchor(Anchor) ->
+ uri_string:quote(Anchor).
+
+-spec render_type_signature(atom(), #config{}) -> 'undefined' | unicode:chardata().
+render_type_signature(Name, #config{docs = #docs_v1{metadata = #{types := AllTypes}}}) ->
+ case [Type || Type = {TName, _} <- maps:keys(AllTypes), TName =:= Name] of
+ [] ->
+ undefined;
+ Types ->
+ [erl_pp:attribute(maps:get(Type, AllTypes)) || Type <- Types]
+ end.
+
+ial([]) ->
+ "";
+ial(Attrs) ->
+ ["{: ", [[ial(Tag, Value), " "] || {Tag,Value} <- Attrs], "}"].
+
+ial(class, Value) ->
+ [".", maybe_quote_ial(Value)];
+ial(id, Value) ->
+ ["#", maybe_quote_ial(Value)];
+ial(Tag, Value) ->
+ [atom_to_list(Tag), "=", maybe_quote_ial(Value)].
+
+maybe_quote_ial(Str) ->
+ case string:find(Str, " ") of
+ nomatch ->
+ Str;
+ _ ->
+ [$",Str,$"]
+ end.
+
+%% Pad N spaces (and possibly pre-prend newline), disabling any ansi formatting while doing so.
+-spec pad(non_neg_integer()) -> unicode:chardata().
+pad(N) ->
+ pad(N, "").
+-spec nlpad(non_neg_integer()) -> unicode:chardata().
+nlpad(N) ->
+ pad(N, "\n").
+-spec pad(non_neg_integer(), unicode:chardata()) -> unicode:chardata().
+pad(N, Extra) ->
+ Pad = lists:duplicate(N, [$\s]),
+ [Extra, Pad].
+
+-spec lastline(unicode:chardata()) -> non_neg_integer().
+%% Look for the length of the last line of a string
+lastline(Str) ->
+ LastStr =
+ case string:find(Str, "\n", trailing) of
+ nomatch ->
+ Str;
+ Match ->
+ tl(string:next_codepoint(Match))
+ end,
+ string:length(LastStr).
+
+%% These functions make sure that we trim extra newlines added
+%% by the renderer. For example if we do <li></li>
+%% that would add 4 \n at after the last </li>. This is trimmed
+%% here to only be 2 \n
+-spec trimnlnl(unicode:chardata() | {unicode:chardata(), non_neg_integer()}) ->
+ {unicode:chardata(), 0}.
+trimnlnl({Chars, _Pos}) ->
+ nl(nl(string:trim(Chars, trailing, "\n")));
+trimnlnl(Chars) ->
+ nl(nl(string:trim(Chars, trailing, "\n"))).
+-spec trimnl(unicode:chardata() | {unicode:chardata(), non_neg_integer()}) ->
+ {unicode:chardata(), 0}.
+trimnl({Chars, _Pos}) ->
+ nl(string:trim(Chars, trailing, "\n"));
+trimnl(Chars) ->
+ nl(string:trim(Chars, trailing, "\n")).
+trim(Chars) ->
+ string:trim(Chars, trailing, "\n").
+-spec nl(unicode:chardata() | {unicode:chardata(), non_neg_integer()}) -> {unicode:chardata(), 0}.
+nl({Chars, _Pos}) ->
+ nl(Chars);
+nl(Chars) ->
+ {[Chars, "\n"], 0}.
+
+
+%%======================================================================
+%% Records
+%%======================================================================
+
+%%----------------------------------------------------------------------
+%% State record for the validator
+%%----------------------------------------------------------------------
+-record(state, {
+	 tags=[], %% Tag stack
+	 dom=[] %% DOM structure
+	 }).
+
+%%======================================================================
+%% External functions
+%%======================================================================
+
+%%----------------------------------------------------------------------
+%% Function: initial_state() -> Result
+%% Parameters:
+%% Result:
+%% Description:
+%%----------------------------------------------------------------------
+initial_state() ->
+ #state{}.
+
+%%----------------------------------------------------------------------
+%% Function: get_dom(State) -> Result
+%% Parameters:
+%% Result:
+%% Description:
+%%----------------------------------------------------------------------
+get_dom(#state{dom=Dom}) ->
+ Dom.
+
+%%----------------------------------------------------------------------
+%% Function: event(Event, LineNo, State) -> Result
+%% Parameters:
+%% Result:
+%% Description:
+%%----------------------------------------------------------------------
+event(Event, _LineNo, State) ->
+ build_dom(Event, State).
+
+
+%%======================================================================
+%% Internal functions
+%%======================================================================
+
+%%----------------------------------------------------------------------
+%% Function : build_dom(Event, State) -> Result
+%% Parameters: Event = term()
+%% State = #xmerl_sax_simple_dom_state{}
+%% Result : #xmerl_sax_simple_dom_state{} |
+%% Description:
+%%----------------------------------------------------------------------
+
+%% Document
+%%----------------------------------------------------------------------
+build_dom(startDocument, State) ->
+ State#state{dom=[startDocument]};
+build_dom(endDocument,
+	 #state{dom=[{Tag, Attributes, Content} |D]} = State) ->
+ case D of
+	[startDocument] ->
+	 State#state{dom=[{Tag, Attributes,
+ lists:reverse(Content)}]};
+	[Decl, startDocument] ->
+	 State#state{dom=[Decl, {Tag, Attributes,
+ lists:reverse(Content)}]};
+	_ ->
+ %% endDocument is also sent by the parser when a fault occur to tell
+ %% the event receiver that no more input will be sent
+	 State
+ end;
+
+%% Element
+%%----------------------------------------------------------------------
+build_dom({startElement, _Uri, LocalName, _QName, Attributes},
+	 #state{tags=T, dom=D} = State) ->
+
+ A = parse_attributes(LocalName, Attributes),
+ CName = list_to_atom(LocalName),
+
+ State#state{tags=[CName |T],
+ dom=[{CName,
+ lists:reverse(A),
+ []
+ } | D]};
+build_dom({endElement, _Uri, LocalName, _QName},
+	 #state{tags=[_ |T],
+ dom=[{CName, CAttributes, CContent},
+ {PName, PAttributes, PContent} = _Parent | D]} = State) ->
+ case list_to_atom(LocalName) of
+	CName ->
+ SectionDepth = length([E || E <- T, E =:= section]),
+ MappedCName =
+ case CName of
+ title ->
+ lists:nth(SectionDepth+1,[h1,h2,h3,h4,h5,h6]);
+ section when SectionDepth > 0 ->
+ 'div';
+ CName -> CName
+ end,
+
+ State#state{tags=T,
+ dom=[{PName, PAttributes,
+ [{MappedCName, CAttributes,
+ lists:reverse(CContent)}
+ |PContent]
+ } | D]};
+ _ ->
+ throw({dom_error, "Got end of element: " ++ LocalName ++ " but expected: " ++
+ CName})
+ end;
+
+%% Text
+%%----------------------------------------------------------------------
+build_dom({characters, String},
+	 #state{dom=[{Name, Attributes, Content}| D]} = State) ->
+ State#state{dom=[{Name, Attributes, [unicode:characters_to_binary(String,utf8)| Content]} | D]};
+build_dom(startCDATA, State) ->
+ State#state{ tags = [startCDATA | State#state.tags ] };
+build_dom(endCDATA, #state{ tags = [ CData | T ] } = State) ->
+ CData = startCDATA,
+ State#state{ tags = T };
+
+build_dom({ignorableWhitespace, String},
+ #state{dom=[{Name,_,_} = _E|_]} = State) ->
+ case lists:member(Name,
+ [p,pre,input,code,quote,warning,
+ note,change,dont,do,c,b,i,em,strong,
+ seemfa,seeerl,seetype,seeapp,
+ seecom,seecref,seefile,seeguide,
+ tag,item]) of
+ true ->
+% io:format("Keep ign white: ~p ~p~n",[String, _E]),
+ build_dom({characters, String}, State);
+ false ->
+ State
+ end;
+
+build_dom({startEntity, _SysId}, State) ->
+ %% io:format("startEntity:~p~n",[_SysId]),
+ State;
+
+%% Default
+%%----------------------------------------------------------------------
+build_dom(_E, State) ->
+ %% io:format("IgnoredEvent: ~p~n",[_E]),
+ State.
+
+%%----------------------------------------------------------------------
+%% Function : parse_attributes(ElName, Attributes) -> Result
+%% Parameters:
+%% Result :
+%% Description:
+%%----------------------------------------------------------------------
+parse_attributes(ElName, Attributes) ->
+ parse_attributes(ElName, Attributes, 1, []).
+
+parse_attributes(_, [], _, Acc) ->
+ Acc;
+parse_attributes(ElName, [{_Uri, _Prefix, LocalName, AttrValue} |As], N, Acc) ->
+ parse_attributes(ElName, As, N+1, [{list_to_atom(LocalName), AttrValue} |Acc]).
+
+transform([{section,_,Content}|T],Acc) ->
+ transform(T,[transform(Content,[])|Acc]);
+
+%% transform <list><item> to <ul><li> or <ol><li> depending on type attribute
+transform([{list,Attr,Content}|T],Acc) ->
+ transform([transform_list(Attr,Content)|T],Acc);
+
+%% transform <taglist>(tag,item+)+ to <dl>(dt,item+)+
+transform([{taglist,Attr,Content}|T],Acc) ->
+ transform([transform_taglist(Attr,Content)|T],Acc);
+
+%% remove <anno> as it is only used to validate specs vs xml src
+transform([{anno,[],Content}|T],Acc) ->
+ transform([Content|T],Acc);
+
+%% transform <c> to <code>
+transform([{c,[],Content}|T],Acc) ->
+ transform(T, [{code,[],transform(Content,[])}|Acc]);
+
+%% transform <code> to <pre><code>
+transform([{code,Attr,Content}|T],Acc) ->
+ transform(T, [{pre,[],[{code,a2b(Attr),transform(Content,[])}]}|Acc]);
+%% transform <pre> to <pre><code>
+transform([{pre,Attr,Content}|T],Acc) ->
+ transform(T, [{pre,[],[{code,Attr,transform(Content,[])}]}|Acc]);
+
+%% transform <marker id="name"/> to <a id="name"/>....
+transform([{marker,Attrs,Content}|T],Acc) ->
+ transform(T,[{a,a2b(Attrs),transform(Content,[])}|Acc]);
+%% transform <url href="external URL"> Content</url> to <a href....
+transform([{url,Attrs,Content}|T],Acc) ->
+ transform(T,[{a,a2b(Attrs),transform(Content,[])}|Acc]);
+%% transform note/change/warning/do/don't to 
+transform([{What,[],Content}|T],Acc)
+ when What =:= note; What =:= change; What =:= warning; What =:= do; What =:= dont ->
+ WhatP = {'div',[{class,atom_to_binary(What)}], transform(Content,[])},
+ transform(T,[WhatP|Acc]);
+
+transform([Elem = {See,_Attr,_Content}|T],Acc)
+ when See =:= seemfa; See =:= seeerl; See =:= seetype; See =:= seeapp;
+ See =:= seecom; See =:= seecref; See =:= seefile; See =:= seeguide ->
+ transform([transform_see(Elem)|T],Acc);
+
+transform([{term,Attr,[]}|T],Acc) ->
+ transform([list_to_binary(proplists:get_value(id,Attr))|T],Acc);
+
+transform([{p,Attr,Content}|T],Acc) ->
+ transform(T,[{p,a2b(Attr),transform(Content,[])}|Acc]);
+transform([{'div',Attr,Content}|T],Acc) ->
+ transform(T,[{'div',a2b(Attr),transform(Content,[])}|Acc]);
+
+%% Tag and Attr is used as is but Content is transformed
+transform([{Tag,Attr,Content}|T],Acc) ->
+ transform(T,[{Tag,Attr,transform(Content,[])}|Acc]);
+transform([Binary|T],Acc) ->
+ transform(T,[Binary|Acc]);
+transform([],Acc) ->
+ lists:flatten(lists:reverse(Acc)).
+
+transform_list([{type,"ordered"}],Content) ->
+ {ol,[],[{li,A2,C2}||{item,A2,C2}<-Content]};
+transform_list(_,Content) ->
+ {ul,[],[{li,A2,C2}||{item,A2,C2}<-Content]}.
+
+transform_taglist(Attr,Content) ->
+ Items =
+ lists:map(fun({tag,_A,_C}=Tag) ->
+ transform_tag(Tag);
+ ({item,A,C}) ->
+ {dd,A,C}
+ end, Content),
+ %% io:format("Items: ~p~n",[Items]),
+ {dl,Attr,Items}.
+
+transform_tag({tag, Attr0, C}) ->
+ Attr1 = lists:map(fun({since,Vsn}) ->
+ {since,
+ unicode:characters_to_binary(Vsn)};
+ (A) ->
+ A
+ end,
+ Attr0),
+ {dt,Attr1,C}.
+
+strip_tags([{_Tag,_Attr,Content}|T]) ->
+ [Content | strip_tags(T)];
+strip_tags([H|T]) when not is_tuple(H) ->
+ [H | strip_tags(T)];
+strip_tags([]) ->
+ [].
+
+transform_see({See,[{marker,Marker}],Content}) ->
+ AbsMarker =
+ case string:split(Marker, "#") of
+ [AppFile] -> marker_defaults(AppFile);
+ [AppFile, Anchor] -> [marker_defaults(AppFile), "#", Anchor]
+ end,
+
+ {a, [{href,iolist_to_binary(AbsMarker)},
+ {rel,<<"https://erlang.org/doc/link/",(atom_to_binary(See))/binary>>}], Content}.
+
+marker_defaults("") ->
+ [get(application), ":", filename:rootname(unicode:characters_to_list(get(module)))];
+marker_defaults(AppFile) ->
+ case string:split(AppFile, ":") of
+ [File] -> [get(application), ":", File];
+ [App, File] -> [App, ":", File]
+ end.
+
+a2b(Attrs) ->
+ [{Tag,unicode:characters_to_binary(Value)} || {Tag,Value} <- Attrs].
-- 
2.35.3

Places

File 4434-edoc-Add-utility-to-convert-html-to-markdown.patch of Package erlang (Revision 54461a2357af3de1f765489d2fd0ee14)

Places