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%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1997-2012. All Rights Reserved.
%% 
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%

%%%------------------------------------------------------------------
%%% Purpose:Convert Erlang files to html.
%%%------------------------------------------------------------------

-module(erl2html2).
-export([convert/2, convert/3]).

convert([], _Dest) ->   % Fake clause.
    ok;
convert(File, Dest) ->
    %% The generated code uses the BGCOLOR attribute in the
    %% BODY tag, which wasn't valid until HTML 3.2.  Also,
    %% good HTML should either override all colour attributes
    %% or none of them -- *never* just a few.
    %%
    %% FIXME: The colours should *really* be set with
    %% stylesheets...
    Header = ["<!DOCTYPE HTML PUBLIC "
	      "\"-//W3C//DTD HTML 3.2 Final//EN\">\n"
	      "<!-- autogenerated by '"++atom_to_list(?MODULE)++"'. -->\n"
	      "<html>\n"
	      "<head><title>", File, "</title></head>\n\n"
	      "<body bgcolor=\"white\" text=\"black\""
	      " link=\"blue\" vlink=\"purple\" alink=\"red\">\n"],
    convert(File, Dest, Header).
    
convert(File, Dest, Header) ->
    %% statistics(runtime),
    case parse_file(File) of
	{ok,Functions} ->
	    %% io:format("~p~n",[Functions]),
	    case file:read_file(File) of
		{ok,Bin} ->
		    {Html,Lines} = build_html(Bin,Functions),
		    Html1 = [Header,"<pre>\n",Html,"</pre>\n",
			     footer(Lines),"</body>\n</html>\n"],
		    file:write_file(Dest,Html1);
		Error ->
		    Error
	    end;
	Error ->
	    Error
    end.

%%%-----------------------------------------------------------------
%%% Parse the input file to get the line numbers for all function
%%% definitions. This will be used when creating link targets for each
%%% function in build_html/5.
%%%
%%% All function clauses are also marked in order to allow
%%% possibly_enhance/2 to write these in bold.
parse_file(File) ->
    case epp:parse_file(File,[],[]) of
	{ok,Forms} ->
	    {ok,get_functions(Forms,File,false)};
	Error ->
	    Error
    end.

get_functions([{attribute,_,file,{File,_}}|Forms],File,_) ->
    get_functions(Forms,File,true);
get_functions([{attribute,_,file,{_OtherFile,_}}|Forms],File,_) ->
    get_functions(Forms,File,false);
get_functions([{function,L,F,A,[_|C]}|Forms],File,true) ->
    Clauses = [{clause,CL} || {clause,CL,_,_,_} <- C],
    [{atom_to_list(F),A,L} | Clauses] ++ get_functions(Forms,File,true);
get_functions([_|Forms],File,InCorrectFile) ->
    get_functions(Forms,File,InCorrectFile);
get_functions([],_,_) ->
    [].

%%%-----------------------------------------------------------------
%%% Add a link target for each line and one for each function definition.
build_html(Bin,Functions) ->
    build_html(binary:split(Bin,<<"\n">>),1,Functions,false,[]).

build_html(Split,L,[{F,A,L}|Functions],_IsFuncDef,Acc) ->
    FALink = http_uri:encode(F++"-"++integer_to_list(A)),
    NewAcc = [Acc,"<a name=\"",FALink,"\"/>"],
    build_html(Split,L,Functions,true,NewAcc);
build_html(Split,L,[{clause,L}|Functions],_IsFuncDef,Acc) ->
    build_html(Split,L,Functions,true,Acc);
build_html([Line,Bin],L,Functions,IsFuncDef,Acc) ->
    NewAcc = [Acc,line_number(L),line(binary_to_list(Line),IsFuncDef),$\n],
    build_html(binary:split(Bin,<<"\n">>),L+1,Functions,false,NewAcc);
build_html([Line],L,Functions,IsFuncDef,Acc) ->
    {[Acc,line_number(L),line(binary_to_list(Line),IsFuncDef)],L}.

line_number(L) ->
    LStr = integer_to_list(L),
    Pred =
	case length(LStr) of
	    Length when Length < 5 ->
		lists:duplicate(5-Length,$\s);
	    _ -> 
		[]
	end, 
    ["<a name=\"",LStr,"\"/>",Pred,LStr,": "].

line(Str,IsFuncDef) ->
    Str1 = htmlize(Str),
    possibly_enhance(Str1,IsFuncDef).

%%%-----------------------------------------------------------------
%%% Substitute special characters that should not appear in HTML
htmlize([$<|Str]) ->
    [$&,$l,$t,$;|htmlize(Str)];
htmlize([$>|Str]) ->
    [$&,$g,$t,$;|htmlize(Str)];
htmlize([$&|Str]) ->
    [$&,$a,$m,$p,$;|htmlize(Str)];
htmlize([$"|Str]) ->
    [$&,$q,$u,$o,$t,$;|htmlize(Str)];
htmlize([Ch|Str]) ->
    [Ch|htmlize(Str)];
htmlize([]) ->
    [].

%%%-----------------------------------------------------------------
%%% Write comments in italic and function definitions in bold.
possibly_enhance(Str,true) ->
    case lists:splitwith(fun($() -> false; (_) -> true end, Str) of
	{_,[]} -> Str;
	{F,A} -> ["<b>",F,"</b>",A]
    end;
possibly_enhance([$%|_]=Str,_) ->
    ["<i>",Str,"</i>"];
possibly_enhance([$-|_]=Str,_) ->
    possibly_enhance(Str,true);
possibly_enhance(Str,false) ->
    Str.

%%%-----------------------------------------------------------------
%%% End of the file
footer(_Lines) ->
   "".
   %% {_, Time} = statistics(runtime),
   %% io:format("Converted ~p lines in ~.2f Seconds.~n",
   %% 	      [_Lines, Time/1000]),
   %% S = "<i>The transformation of this file (~p lines) took ~.2f seconds</i>",
   %% F = lists:flatten(io_lib:format(S, [_Lines, Time/1000])),
   %% ["<hr size=1>",F,"<br>\n"].