| %% @author Bob Ippolito <bob@mochimedia.com> |
| %% @copyright 2007 Mochi Media, Inc. |
| |
| %% @doc Loosely tokenizes and generates parse trees for HTML 4. |
| -module(mochiweb_html). |
| -export([tokens/1, parse/1, parse_tokens/1, to_tokens/1, escape/1, |
| escape_attr/1, to_html/1, test/0]). |
| |
| % This is a macro to placate syntax highlighters.. |
| -define(QUOTE, $\"). |
| -define(SQUOTE, $\'). |
| -define(ADV_COL(S, N), |
| S#decoder{column=N+S#decoder.column, |
| offset=N+S#decoder.offset}). |
| -define(INC_COL(S), |
| S#decoder{column=1+S#decoder.column, |
| offset=1+S#decoder.offset}). |
| -define(INC_LINE(S), |
| S#decoder{column=1, |
| line=1+S#decoder.line, |
| offset=1+S#decoder.offset}). |
| -define(INC_CHAR(S, C), |
| case C of |
| $\n -> |
| S#decoder{column=1, |
| line=1+S#decoder.line, |
| offset=1+S#decoder.offset}; |
| _ -> |
| S#decoder{column=1+S#decoder.column, |
| offset=1+S#decoder.offset} |
| end). |
| |
| -define(IS_WHITESPACE(C), |
| (C =:= $\s orelse C =:= $\t orelse C =:= $\r orelse C =:= $\n)). |
| -define(IS_LITERAL_SAFE(C), |
| ((C >= $A andalso C =< $Z) orelse (C >= $a andalso C =< $z) |
| orelse (C >= $0 andalso C =< $9))). |
| |
| -record(decoder, {line=1, |
| column=1, |
| offset=0}). |
| |
| %% @type html_node() = {string(), [html_attr()], [html_node() | string()]} |
| %% @type html_attr() = {string(), string()} |
| %% @type html_token() = html_data() | start_tag() | end_tag() | inline_html() | html_comment() | html_doctype() |
| %% @type html_data() = {data, string(), Whitespace::boolean()} |
| %% @type start_tag() = {start_tag, Name, [html_attr()], Singleton::boolean()} |
| %% @type end_tag() = {end_tag, Name} |
| %% @type html_comment() = {comment, Comment} |
| %% @type html_doctype() = {doctype, [Doctype]} |
| %% @type inline_html() = {'=', iolist()} |
| |
| %% External API. |
| |
| %% @spec parse(string() | binary()) -> html_node() |
| %% @doc tokenize and then transform the token stream into a HTML tree. |
| parse(Input) -> |
| parse_tokens(tokens(Input)). |
| |
| %% @spec parse_tokens([html_token()]) -> html_node() |
| %% @doc Transform the output of tokens(Doc) into a HTML tree. |
| parse_tokens(Tokens) when is_list(Tokens) -> |
| %% Skip over doctype, processing instructions |
| F = fun (X) -> |
| case X of |
| {start_tag, _, _, false} -> |
| false; |
| _ -> |
| true |
| end |
| end, |
| [{start_tag, Tag, Attrs, false} | Rest] = lists:dropwhile(F, Tokens), |
| {Tree, _} = tree(Rest, [norm({Tag, Attrs})]), |
| Tree. |
| |
| %% @spec tokens(StringOrBinary) -> [html_token()] |
| %% @doc Transform the input UTF-8 HTML into a token stream. |
| tokens(Input) -> |
| tokens(iolist_to_binary(Input), #decoder{}, []). |
| |
| %% @spec to_tokens(html_node()) -> [html_token()] |
| %% @doc Convert a html_node() tree to a list of tokens. |
| to_tokens({Tag0}) -> |
| to_tokens({Tag0, [], []}); |
| to_tokens(T={'=', _}) -> |
| [T]; |
| to_tokens(T={doctype, _}) -> |
| [T]; |
| to_tokens(T={comment, _}) -> |
| [T]; |
| to_tokens({Tag0, Acc}) -> |
| to_tokens({Tag0, [], Acc}); |
| to_tokens({Tag0, Attrs, Acc}) -> |
| Tag = to_tag(Tag0), |
| to_tokens([{Tag, Acc}], [{start_tag, Tag, Attrs, is_singleton(Tag)}]). |
| |
| %% @spec to_html([html_token()] | html_node()) -> iolist() |
| %% @doc Convert a list of html_token() to a HTML document. |
| to_html(Node) when is_tuple(Node) -> |
| to_html(to_tokens(Node)); |
| to_html(Tokens) when is_list(Tokens) -> |
| to_html(Tokens, []). |
| |
| %% @spec escape(string() | atom() | binary()) -> binary() |
| %% @doc Escape a string such that it's safe for HTML (amp; lt; gt;). |
| escape(B) when is_binary(B) -> |
| escape(binary_to_list(B), []); |
| escape(A) when is_atom(A) -> |
| escape(atom_to_list(A), []); |
| escape(S) when is_list(S) -> |
| escape(S, []). |
| |
| %% @spec escape_attr(string() | binary() | atom() | integer() | float()) -> binary() |
| %% @doc Escape a string such that it's safe for HTML attrs |
| %% (amp; lt; gt; quot;). |
| escape_attr(B) when is_binary(B) -> |
| escape_attr(binary_to_list(B), []); |
| escape_attr(A) when is_atom(A) -> |
| escape_attr(atom_to_list(A), []); |
| escape_attr(S) when is_list(S) -> |
| escape_attr(S, []); |
| escape_attr(I) when is_integer(I) -> |
| escape_attr(integer_to_list(I), []); |
| escape_attr(F) when is_float(F) -> |
| escape_attr(mochinum:digits(F), []). |
| |
| %% @spec test() -> ok |
| %% @doc Run tests for mochiweb_html. |
| test() -> |
| test_destack(), |
| test_tokens(), |
| test_tokens2(), |
| test_parse(), |
| test_parse2(), |
| test_parse_tokens(), |
| test_escape(), |
| test_escape_attr(), |
| test_to_html(), |
| ok. |
| |
| |
| %% Internal API |
| |
| test_to_html() -> |
| Expect = <<"<html><head><title>hey!</title></head><body><p class=\"foo\">what's up<br /></p><div>sucka</div><!-- comment! --></body></html>">>, |
| Expect = iolist_to_binary( |
| to_html({html, [], |
| [{<<"head">>, [], |
| [{title, <<"hey!">>}]}, |
| {body, [], |
| [{p, [{class, foo}], [<<"what's">>, <<" up">>, {br}]}, |
| {'div', <<"sucka">>}, |
| {comment, <<" comment! ">>}]}]})), |
| Expect1 = <<"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">">>, |
| Expect1 = iolist_to_binary( |
| to_html({doctype, |
| [<<"html">>, <<"PUBLIC">>, |
| <<"-//W3C//DTD XHTML 1.0 Transitional//EN">>, |
| <<"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">>]})), |
| ok. |
| to_html([], Acc) -> |
| lists:reverse(Acc); |
| to_html([{'=', Content} | Rest], Acc) -> |
| to_html(Rest, [Content | Acc]); |
| to_html([{pi, Tag, Attrs} | Rest], Acc) -> |
| Open = [<<"<?">>, |
| Tag, |
| attrs_to_html(Attrs, []), |
| <<"?>">>], |
| to_html(Rest, [Open | Acc]); |
| to_html([{comment, Comment} | Rest], Acc) -> |
| to_html(Rest, [[<<"<!--">>, Comment, <<"-->">>] | Acc]); |
| to_html([{doctype, Parts} | Rest], Acc) -> |
| Inside = doctype_to_html(Parts, Acc), |
| to_html(Rest, [[<<"<!DOCTYPE">>, Inside, <<">">>] | Acc]); |
| to_html([{data, Data, _Whitespace} | Rest], Acc) -> |
| to_html(Rest, [escape(Data) | Acc]); |
| to_html([{start_tag, Tag, Attrs, Singleton} | Rest], Acc) -> |
| Open = [<<"<">>, |
| Tag, |
| attrs_to_html(Attrs, []), |
| case Singleton of |
| true -> <<" />">>; |
| false -> <<">">> |
| end], |
| to_html(Rest, [Open | Acc]); |
| to_html([{end_tag, Tag} | Rest], Acc) -> |
| to_html(Rest, [[<<"</">>, Tag, <<">">>] | Acc]). |
| |
| doctype_to_html([], Acc) -> |
| lists:reverse(Acc); |
| doctype_to_html([Word | Rest], Acc) -> |
| case lists:all(fun (C) -> ?IS_LITERAL_SAFE(C) end, |
| binary_to_list(iolist_to_binary(Word))) of |
| true -> |
| doctype_to_html(Rest, [[<<" ">>, Word] | Acc]); |
| false -> |
| doctype_to_html(Rest, [[<<" \"">>, escape_attr(Word), ?QUOTE] | Acc]) |
| end. |
| |
| attrs_to_html([], Acc) -> |
| lists:reverse(Acc); |
| attrs_to_html([{K, V} | Rest], Acc) -> |
| attrs_to_html(Rest, |
| [[<<" ">>, escape(K), <<"=\"">>, |
| escape_attr(V), <<"\"">>] | Acc]). |
| |
| test_escape() -> |
| <<"&quot;\"word <<up!&quot;">> = |
| escape(<<""\"word <<up!"">>), |
| ok. |
| |
| test_escape_attr() -> |
| <<"&quot;"word <<up!&quot;">> = |
| escape_attr(<<""\"word <<up!"">>), |
| ok. |
| |
| escape([], Acc) -> |
| list_to_binary(lists:reverse(Acc)); |
| escape("<" ++ Rest, Acc) -> |
| escape(Rest, lists:reverse("<", Acc)); |
| escape(">" ++ Rest, Acc) -> |
| escape(Rest, lists:reverse(">", Acc)); |
| escape("&" ++ Rest, Acc) -> |
| escape(Rest, lists:reverse("&", Acc)); |
| escape([C | Rest], Acc) -> |
| escape(Rest, [C | Acc]). |
| |
| escape_attr([], Acc) -> |
| list_to_binary(lists:reverse(Acc)); |
| escape_attr("<" ++ Rest, Acc) -> |
| escape_attr(Rest, lists:reverse("<", Acc)); |
| escape_attr(">" ++ Rest, Acc) -> |
| escape_attr(Rest, lists:reverse(">", Acc)); |
| escape_attr("&" ++ Rest, Acc) -> |
| escape_attr(Rest, lists:reverse("&", Acc)); |
| escape_attr([?QUOTE | Rest], Acc) -> |
| escape_attr(Rest, lists:reverse(""", Acc)); |
| escape_attr([C | Rest], Acc) -> |
| escape_attr(Rest, [C | Acc]). |
| |
| to_tag(A) when is_atom(A) -> |
| norm(atom_to_list(A)); |
| to_tag(L) -> |
| norm(L). |
| |
| to_tokens([], Acc) -> |
| lists:reverse(Acc); |
| to_tokens([{Tag, []} | Rest], Acc) -> |
| to_tokens(Rest, [{end_tag, to_tag(Tag)} | Acc]); |
| to_tokens([{Tag0, [{T0} | R1]} | Rest], Acc) -> |
| %% Allow {br} |
| to_tokens([{Tag0, [{T0, [], []} | R1]} | Rest], Acc); |
| to_tokens([{Tag0, [T0={'=', _C0} | R1]} | Rest], Acc) -> |
| %% Allow {'=', iolist()} |
| to_tokens([{Tag0, R1} | Rest], [T0 | Acc]); |
| to_tokens([{Tag0, [T0={comment, _C0} | R1]} | Rest], Acc) -> |
| %% Allow {comment, iolist()} |
| to_tokens([{Tag0, R1} | Rest], [T0 | Acc]); |
| to_tokens([{Tag0, [{T0, A0=[{_, _} | _]} | R1]} | Rest], Acc) -> |
| %% Allow {p, [{"class", "foo"}]} |
| to_tokens([{Tag0, [{T0, A0, []} | R1]} | Rest], Acc); |
| to_tokens([{Tag0, [{T0, C0} | R1]} | Rest], Acc) -> |
| %% Allow {p, "content"} and {p, <<"content">>} |
| to_tokens([{Tag0, [{T0, [], C0} | R1]} | Rest], Acc); |
| to_tokens([{Tag0, [{T0, A1, C0} | R1]} | Rest], Acc) when is_binary(C0) -> |
| %% Allow {"p", [{"class", "foo"}], <<"content">>} |
| to_tokens([{Tag0, [{T0, A1, binary_to_list(C0)} | R1]} | Rest], Acc); |
| to_tokens([{Tag0, [{T0, A1, C0=[C | _]} | R1]} | Rest], Acc) |
| when is_integer(C) -> |
| %% Allow {"p", [{"class", "foo"}], "content"} |
| to_tokens([{Tag0, [{T0, A1, [C0]} | R1]} | Rest], Acc); |
| to_tokens([{Tag0, [{T0, A1, C1} | R1]} | Rest], Acc) -> |
| %% Native {"p", [{"class", "foo"}], ["content"]} |
| Tag = to_tag(Tag0), |
| T1 = to_tag(T0), |
| case is_singleton(norm(T1)) of |
| true -> |
| to_tokens([{Tag, R1} | Rest], [{start_tag, T1, A1, true} | Acc]); |
| false -> |
| to_tokens([{T1, C1}, {Tag, R1} | Rest], |
| [{start_tag, T1, A1, false} | Acc]) |
| end; |
| to_tokens([{Tag0, [L | R1]} | Rest], Acc) when is_list(L) -> |
| %% List text |
| Tag = to_tag(Tag0), |
| to_tokens([{Tag, R1} | Rest], [{data, iolist_to_binary(L), false} | Acc]); |
| to_tokens([{Tag0, [B | R1]} | Rest], Acc) when is_binary(B) -> |
| %% Binary text |
| Tag = to_tag(Tag0), |
| to_tokens([{Tag, R1} | Rest], [{data, B, false} | Acc]). |
| |
| test_tokens() -> |
| [{start_tag, <<"foo">>, [{<<"bar">>, <<"baz">>}, |
| {<<"wibble">>, <<"wibble">>}, |
| {<<"alice">>, <<"bob">>}], true}] = |
| tokens(<<"<foo bar=baz wibble='wibble' alice=\"bob\"/>">>), |
| [{start_tag, <<"foo">>, [{<<"bar">>, <<"baz">>}, |
| {<<"wibble">>, <<"wibble">>}, |
| {<<"alice">>, <<"bob">>}], true}] = |
| tokens(<<"<foo bar=baz wibble='wibble' alice=bob/>">>), |
| [{comment, <<"[if lt IE 7]>\n<style type=\"text/css\">\n.no_ie { display: none; }\n</style>\n<![endif]">>}] = |
| tokens(<<"<!--[if lt IE 7]>\n<style type=\"text/css\">\n.no_ie { display: none; }\n</style>\n<![endif]-->">>), |
| [{start_tag, <<"script">>, [{<<"type">>, <<"text/javascript">>}], false}, |
| {data, <<" A= B <= C ">>, false}, |
| {end_tag, <<"script">>}] = |
| tokens(<<"<script type=\"text/javascript\"> A= B <= C </script>">>), |
| [{start_tag, <<"script">>, [{<<"type">>, <<"text/javascript">>}], false}, |
| {data, <<" A= B <= C ">>, false}, |
| {end_tag, <<"script">>}] = |
| tokens(<<"<script type =\"text/javascript\"> A= B <= C </script>">>), |
| [{start_tag, <<"script">>, [{<<"type">>, <<"text/javascript">>}], false}, |
| {data, <<" A= B <= C ">>, false}, |
| {end_tag, <<"script">>}] = |
| tokens(<<"<script type = \"text/javascript\"> A= B <= C </script>">>), |
| [{start_tag, <<"script">>, [{<<"type">>, <<"text/javascript">>}], false}, |
| {data, <<" A= B <= C ">>, false}, |
| {end_tag, <<"script">>}] = |
| tokens(<<"<script type= \"text/javascript\"> A= B <= C </script>">>), |
| [{start_tag, <<"textarea">>, [], false}, |
| {data, <<"<html></body>">>, false}, |
| {end_tag, <<"textarea">>}] = |
| tokens(<<"<textarea><html></body></textarea>">>), |
| ok. |
| |
| tokens(B, S=#decoder{offset=O}, Acc) -> |
| case B of |
| <<_:O/binary>> -> |
| lists:reverse(Acc); |
| _ -> |
| {Tag, S1} = tokenize(B, S), |
| case parse_flag(Tag) of |
| script -> |
| {Tag2, S2} = tokenize_script(B, S1), |
| tokens(B, S2, [Tag2, Tag | Acc]); |
| textarea -> |
| {Tag2, S2} = tokenize_textarea(B, S1), |
| tokens(B, S2, [Tag2, Tag | Acc]); |
| none -> |
| tokens(B, S1, [Tag | Acc]) |
| end |
| end. |
| |
| parse_flag({start_tag, B, _, false}) -> |
| case string:to_lower(binary_to_list(B)) of |
| "script" -> |
| script; |
| "textarea" -> |
| textarea; |
| _ -> |
| none |
| end; |
| parse_flag(_) -> |
| none. |
| |
| tokenize(B, S=#decoder{offset=O}) -> |
| case B of |
| <<_:O/binary, "<!--", _/binary>> -> |
| tokenize_comment(B, ?ADV_COL(S, 4)); |
| <<_:O/binary, "<!DOCTYPE", _/binary>> -> |
| tokenize_doctype(B, ?ADV_COL(S, 10)); |
| <<_:O/binary, "<![CDATA[", _/binary>> -> |
| tokenize_cdata(B, ?ADV_COL(S, 9)); |
| <<_:O/binary, "<?", _/binary>> -> |
| {Tag, S1} = tokenize_literal(B, ?ADV_COL(S, 2)), |
| {Attrs, S2} = tokenize_attributes(B, S1), |
| S3 = find_qgt(B, S2), |
| {{pi, Tag, Attrs}, S3}; |
| <<_:O/binary, "&", _/binary>> -> |
| tokenize_charref(B, ?INC_COL(S)); |
| <<_:O/binary, "</", _/binary>> -> |
| {Tag, S1} = tokenize_literal(B, ?ADV_COL(S, 2)), |
| {S2, _} = find_gt(B, S1), |
| {{end_tag, Tag}, S2}; |
| <<_:O/binary, "<", C, _/binary>> when ?IS_WHITESPACE(C) -> |
| %% This isn't really strict HTML |
| tokenize_data(B, ?INC_COL(S)); |
| <<_:O/binary, "<", _/binary>> -> |
| {Tag, S1} = tokenize_literal(B, ?INC_COL(S)), |
| {Attrs, S2} = tokenize_attributes(B, S1), |
| {S3, HasSlash} = find_gt(B, S2), |
| Singleton = HasSlash orelse is_singleton(norm(binary_to_list(Tag))), |
| {{start_tag, Tag, Attrs, Singleton}, S3}; |
| _ -> |
| tokenize_data(B, S) |
| end. |
| |
| test_parse() -> |
| D0 = <<"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\"> |
| <html> |
| <head> |
| <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\"> |
| <title>Foo</title> |
| <link rel=\"stylesheet\" type=\"text/css\" href=\"/static/rel/dojo/resources/dojo.css\" media=\"screen\"> |
| <link rel=\"stylesheet\" type=\"text/css\" href=\"/static/foo.css\" media=\"screen\"> |
| <!--[if lt IE 7]> |
| <style type=\"text/css\"> |
| .no_ie { display: none; } |
| </style> |
| <![endif]--> |
| <link rel=\"icon\" href=\"/static/images/favicon.ico\" type=\"image/x-icon\"> |
| <link rel=\"shortcut icon\" href=\"/static/images/favicon.ico\" type=\"image/x-icon\"> |
| </head> |
| <body id=\"home\" class=\"tundra\"><![CDATA[<<this<!-- is -->CDATA>>]]></body> |
| </html>">>, |
| Expect = {<<"html">>, [], |
| [{<<"head">>, [], |
| [{<<"meta">>, |
| [{<<"http-equiv">>,<<"Content-Type">>}, |
| {<<"content">>,<<"text/html; charset=UTF-8">>}], |
| []}, |
| {<<"title">>,[],[<<"Foo">>]}, |
| {<<"link">>, |
| [{<<"rel">>,<<"stylesheet">>}, |
| {<<"type">>,<<"text/css">>}, |
| {<<"href">>,<<"/static/rel/dojo/resources/dojo.css">>}, |
| {<<"media">>,<<"screen">>}], |
| []}, |
| {<<"link">>, |
| [{<<"rel">>,<<"stylesheet">>}, |
| {<<"type">>,<<"text/css">>}, |
| {<<"href">>,<<"/static/foo.css">>}, |
| {<<"media">>,<<"screen">>}], |
| []}, |
| {comment,<<"[if lt IE 7]>\n <style type=\"text/css\">\n .no_ie { display: none; }\n </style>\n <![endif]">>}, |
| {<<"link">>, |
| [{<<"rel">>,<<"icon">>}, |
| {<<"href">>,<<"/static/images/favicon.ico">>}, |
| {<<"type">>,<<"image/x-icon">>}], |
| []}, |
| {<<"link">>, |
| [{<<"rel">>,<<"shortcut icon">>}, |
| {<<"href">>,<<"/static/images/favicon.ico">>}, |
| {<<"type">>,<<"image/x-icon">>}], |
| []}]}, |
| {<<"body">>, |
| [{<<"id">>,<<"home">>}, |
| {<<"class">>,<<"tundra">>}], |
| [<<"<<this<!-- is -->CDATA>>">>]}]}, |
| Expect = parse(D0), |
| ok. |
| |
| test_tokens2() -> |
| D0 = <<"<channel><title>from __future__ import *</title><link>http://bob.pythonmac.org</link><description>Bob's Rants</description></channel>">>, |
| Expect = [{start_tag,<<"channel">>,[],false}, |
| {start_tag,<<"title">>,[],false}, |
| {data,<<"from __future__ import *">>,false}, |
| {end_tag,<<"title">>}, |
| {start_tag,<<"link">>,[],true}, |
| {data,<<"http://bob.pythonmac.org">>,false}, |
| {end_tag,<<"link">>}, |
| {start_tag,<<"description">>,[],false}, |
| {data,<<"Bob's Rants">>,false}, |
| {end_tag,<<"description">>}, |
| {end_tag,<<"channel">>}], |
| Expect = tokens(D0), |
| ok. |
| |
| test_parse2() -> |
| D0 = <<"<channel><title>from __future__ import *</title><link>http://bob.pythonmac.org<br>foo</link><description>Bob's Rants</description></channel>">>, |
| Expect = {<<"channel">>,[], |
| [{<<"title">>,[],[<<"from __future__ import *">>]}, |
| {<<"link">>,[],[ |
| <<"http://bob.pythonmac.org">>, |
| {<<"br">>,[],[]}, |
| <<"foo">>]}, |
| {<<"description">>,[],[<<"Bob's Rants">>]}]}, |
| Expect = parse(D0), |
| ok. |
| |
| test_parse_tokens() -> |
| D0 = [{doctype,[<<"HTML">>,<<"PUBLIC">>,<<"-//W3C//DTD HTML 4.01 Transitional//EN">>]}, |
| {data,<<"\n">>,true}, |
| {start_tag,<<"html">>,[],false}], |
| {<<"html">>, [], []} = parse_tokens(D0), |
| D1 = D0 ++ [{end_tag, <<"html">>}], |
| {<<"html">>, [], []} = parse_tokens(D1), |
| D2 = D0 ++ [{start_tag, <<"body">>, [], false}], |
| {<<"html">>, [], [{<<"body">>, [], []}]} = parse_tokens(D2), |
| D3 = D0 ++ [{start_tag, <<"head">>, [], false}, |
| {end_tag, <<"head">>}, |
| {start_tag, <<"body">>, [], false}], |
| {<<"html">>, [], [{<<"head">>, [], []}, {<<"body">>, [], []}]} = parse_tokens(D3), |
| D4 = D3 ++ [{data,<<"\n">>,true}, |
| {start_tag,<<"div">>,[{<<"class">>,<<"a">>}],false}, |
| {start_tag,<<"a">>,[{<<"name">>,<<"#anchor">>}],false}, |
| {end_tag,<<"a">>}, |
| {end_tag,<<"div">>}, |
| {start_tag,<<"div">>,[{<<"class">>,<<"b">>}],false}, |
| {start_tag,<<"div">>,[{<<"class">>,<<"c">>}],false}, |
| {end_tag,<<"div">>}, |
| {end_tag,<<"div">>}], |
| {<<"html">>, [], |
| [{<<"head">>, [], []}, |
| {<<"body">>, [], |
| [{<<"div">>, [{<<"class">>, <<"a">>}], [{<<"a">>, [{<<"name">>, <<"#anchor">>}], []}]}, |
| {<<"div">>, [{<<"class">>, <<"b">>}], [{<<"div">>, [{<<"class">>, <<"c">>}], []}]} |
| ]}]} = parse_tokens(D4), |
| D5 = [{start_tag,<<"html">>,[],false}, |
| {data,<<"\n">>,true}, |
| {data,<<"boo">>,false}, |
| {data,<<"hoo">>,false}, |
| {data,<<"\n">>,true}, |
| {end_tag,<<"html">>}], |
| {<<"html">>, [], [<<"\nboohoo\n">>]} = parse_tokens(D5), |
| D6 = [{start_tag,<<"html">>,[],false}, |
| {data,<<"\n">>,true}, |
| {data,<<"\n">>,true}, |
| {end_tag,<<"html">>}], |
| {<<"html">>, [], []} = parse_tokens(D6), |
| D7 = [{start_tag,<<"html">>,[],false}, |
| {start_tag,<<"ul">>,[],false}, |
| {start_tag,<<"li">>,[],false}, |
| {data,<<"word">>,false}, |
| {start_tag,<<"li">>,[],false}, |
| {data,<<"up">>,false}, |
| {end_tag,<<"li">>}, |
| {start_tag,<<"li">>,[],false}, |
| {data,<<"fdsa">>,false}, |
| {start_tag,<<"br">>,[],true}, |
| {data,<<"asdf">>,false}, |
| {end_tag,<<"ul">>}, |
| {end_tag,<<"html">>}], |
| {<<"html">>, [], |
| [{<<"ul">>, [], |
| [{<<"li">>, [], [<<"word">>]}, |
| {<<"li">>, [], [<<"up">>]}, |
| {<<"li">>, [], [<<"fdsa">>,{<<"br">>, [], []}, <<"asdf">>]}]}]} = parse_tokens(D7), |
| ok. |
| |
| tree_data([{data, Data, Whitespace} | Rest], AllWhitespace, Acc) -> |
| tree_data(Rest, (Whitespace andalso AllWhitespace), [Data | Acc]); |
| tree_data(Rest, AllWhitespace, Acc) -> |
| {iolist_to_binary(lists:reverse(Acc)), AllWhitespace, Rest}. |
| |
| tree([], Stack) -> |
| {destack(Stack), []}; |
| tree([{end_tag, Tag} | Rest], Stack) -> |
| case destack(norm(Tag), Stack) of |
| S when is_list(S) -> |
| tree(Rest, S); |
| Result -> |
| {Result, []} |
| end; |
| tree([{start_tag, Tag, Attrs, true} | Rest], S) -> |
| tree(Rest, append_stack_child(norm({Tag, Attrs}), S)); |
| tree([{start_tag, Tag, Attrs, false} | Rest], S) -> |
| tree(Rest, stack(norm({Tag, Attrs}), S)); |
| tree([T={pi, _Tag, _Attrs} | Rest], S) -> |
| tree(Rest, append_stack_child(T, S)); |
| tree([T={comment, _Comment} | Rest], S) -> |
| tree(Rest, append_stack_child(T, S)); |
| tree(L=[{data, _Data, _Whitespace} | _], S) -> |
| case tree_data(L, true, []) of |
| {_, true, Rest} -> |
| tree(Rest, S); |
| {Data, false, Rest} -> |
| tree(Rest, append_stack_child(Data, S)) |
| end. |
| |
| norm({Tag, Attrs}) -> |
| {norm(Tag), [{norm(K), iolist_to_binary(V)} || {K, V} <- Attrs], []}; |
| norm(Tag) when is_binary(Tag) -> |
| Tag; |
| norm(Tag) -> |
| list_to_binary(string:to_lower(Tag)). |
| |
| test_destack() -> |
| {<<"a">>, [], []} = |
| destack([{<<"a">>, [], []}]), |
| {<<"a">>, [], [{<<"b">>, [], []}]} = |
| destack([{<<"b">>, [], []}, {<<"a">>, [], []}]), |
| {<<"a">>, [], [{<<"b">>, [], [{<<"c">>, [], []}]}]} = |
| destack([{<<"c">>, [], []}, {<<"b">>, [], []}, {<<"a">>, [], []}]), |
| [{<<"a">>, [], [{<<"b">>, [], [{<<"c">>, [], []}]}]}] = |
| destack(<<"b">>, |
| [{<<"c">>, [], []}, {<<"b">>, [], []}, {<<"a">>, [], []}]), |
| [{<<"b">>, [], [{<<"c">>, [], []}]}, {<<"a">>, [], []}] = |
| destack(<<"c">>, |
| [{<<"c">>, [], []}, {<<"b">>, [], []},{<<"a">>, [], []}]), |
| ok. |
| |
| stack(T1={TN, _, _}, Stack=[{TN, _, _} | _Rest]) |
| when TN =:= <<"li">> orelse TN =:= <<"option">> -> |
| [T1 | destack(TN, Stack)]; |
| stack(T1={TN0, _, _}, Stack=[{TN1, _, _} | _Rest]) |
| when (TN0 =:= <<"dd">> orelse TN0 =:= <<"dt">>) andalso |
| (TN1 =:= <<"dd">> orelse TN1 =:= <<"dt">>) -> |
| [T1 | destack(TN1, Stack)]; |
| stack(T1, Stack) -> |
| [T1 | Stack]. |
| |
| append_stack_child(StartTag, [{Name, Attrs, Acc} | Stack]) -> |
| [{Name, Attrs, [StartTag | Acc]} | Stack]. |
| |
| destack(TagName, Stack) when is_list(Stack) -> |
| F = fun (X) -> |
| case X of |
| {TagName, _, _} -> |
| false; |
| _ -> |
| true |
| end |
| end, |
| case lists:splitwith(F, Stack) of |
| {_, []} -> |
| %% If we're parsing something like XML we might find |
| %% a <link>tag</link> that is normally a singleton |
| %% in HTML but isn't here |
| case {is_singleton(TagName), Stack} of |
| {true, [{T0, A0, Acc0} | Post0]} -> |
| case lists:splitwith(F, Acc0) of |
| {_, []} -> |
| %% Actually was a singleton |
| Stack; |
| {Pre, [{T1, A1, []} | Post1]} -> |
| [{T0, A0, [{T1, A1, lists:reverse(Pre)} | Post1]} |
| | Post0] |
| end; |
| _ -> |
| %% No match, no state change |
| Stack |
| end; |
| {_Pre, [_T]} -> |
| %% Unfurl the whole stack, we're done |
| destack(Stack); |
| {Pre, [T, {T0, A0, Acc0} | Post]} -> |
| %% Unfurl up to the tag, then accumulate it |
| [{T0, A0, [destack(Pre ++ [T]) | Acc0]} | Post] |
| end. |
| |
| destack([{Tag, Attrs, Acc}]) -> |
| {Tag, Attrs, lists:reverse(Acc)}; |
| destack([{T1, A1, Acc1}, {T0, A0, Acc0} | Rest]) -> |
| destack([{T0, A0, [{T1, A1, lists:reverse(Acc1)} | Acc0]} | Rest]). |
| |
| is_singleton(<<"br">>) -> true; |
| is_singleton(<<"hr">>) -> true; |
| is_singleton(<<"img">>) -> true; |
| is_singleton(<<"input">>) -> true; |
| is_singleton(<<"base">>) -> true; |
| is_singleton(<<"meta">>) -> true; |
| is_singleton(<<"link">>) -> true; |
| is_singleton(<<"area">>) -> true; |
| is_singleton(<<"param">>) -> true; |
| is_singleton(<<"col">>) -> true; |
| is_singleton(_) -> false. |
| |
| tokenize_data(B, S=#decoder{offset=O}) -> |
| tokenize_data(B, S, O, true). |
| |
| tokenize_data(B, S=#decoder{offset=O}, Start, Whitespace) -> |
| case B of |
| <<_:O/binary, C, _/binary>> when (C =/= $< andalso C =/= $&) -> |
| tokenize_data(B, ?INC_CHAR(S, C), Start, |
| (Whitespace andalso ?IS_WHITESPACE(C))); |
| _ -> |
| Len = O - Start, |
| <<_:Start/binary, Data:Len/binary, _/binary>> = B, |
| {{data, Data, Whitespace}, S} |
| end. |
| |
| tokenize_attributes(B, S) -> |
| tokenize_attributes(B, S, []). |
| |
| tokenize_attributes(B, S=#decoder{offset=O}, Acc) -> |
| case B of |
| <<_:O/binary>> -> |
| {lists:reverse(Acc), S}; |
| <<_:O/binary, C, _/binary>> when (C =:= $> orelse C =:= $/) -> |
| {lists:reverse(Acc), S}; |
| <<_:O/binary, "?>", _/binary>> -> |
| {lists:reverse(Acc), S}; |
| <<_:O/binary, C, _/binary>> when ?IS_WHITESPACE(C) -> |
| tokenize_attributes(B, ?INC_CHAR(S, C), Acc); |
| _ -> |
| {Attr, S1} = tokenize_literal(B, S), |
| {Value, S2} = tokenize_attr_value(Attr, B, S1), |
| tokenize_attributes(B, S2, [{Attr, Value} | Acc]) |
| end. |
| |
| tokenize_attr_value(Attr, B, S) -> |
| S1 = skip_whitespace(B, S), |
| O = S1#decoder.offset, |
| case B of |
| <<_:O/binary, "=", _/binary>> -> |
| S2 = skip_whitespace(B, ?INC_COL(S1)), |
| tokenize_word_or_literal(B, S2); |
| _ -> |
| {Attr, S1} |
| end. |
| |
| skip_whitespace(B, S=#decoder{offset=O}) -> |
| case B of |
| <<_:O/binary, C, _/binary>> when ?IS_WHITESPACE(C) -> |
| skip_whitespace(B, ?INC_CHAR(S, C)); |
| _ -> |
| S |
| end. |
| |
| tokenize_literal(Bin, S) -> |
| tokenize_literal(Bin, S, []). |
| |
| tokenize_literal(Bin, S=#decoder{offset=O}, Acc) -> |
| case Bin of |
| <<_:O/binary, $&, _/binary>> -> |
| {{data, Data, false}, S1} = tokenize_charref(Bin, ?INC_COL(S)), |
| tokenize_literal(Bin, S1, [Data | Acc]); |
| <<_:O/binary, C, _/binary>> when not (?IS_WHITESPACE(C) |
| orelse C =:= $> |
| orelse C =:= $/ |
| orelse C =:= $=) -> |
| tokenize_literal(Bin, ?INC_COL(S), [C | Acc]); |
| _ -> |
| {iolist_to_binary(lists:reverse(Acc)), S} |
| end. |
| |
| find_qgt(Bin, S=#decoder{offset=O}) -> |
| case Bin of |
| <<_:O/binary, "?>", _/binary>> -> |
| ?ADV_COL(S, 2); |
| <<_:O/binary, C, _/binary>> -> |
| find_qgt(Bin, ?INC_CHAR(S, C)); |
| _ -> |
| S |
| end. |
| |
| find_gt(Bin, S) -> |
| find_gt(Bin, S, false). |
| |
| find_gt(Bin, S=#decoder{offset=O}, HasSlash) -> |
| case Bin of |
| <<_:O/binary, $/, _/binary>> -> |
| find_gt(Bin, ?INC_COL(S), true); |
| <<_:O/binary, $>, _/binary>> -> |
| {?INC_COL(S), HasSlash}; |
| <<_:O/binary, C, _/binary>> -> |
| find_gt(Bin, ?INC_CHAR(S, C), HasSlash); |
| _ -> |
| {S, HasSlash} |
| end. |
| |
| tokenize_charref(Bin, S=#decoder{offset=O}) -> |
| tokenize_charref(Bin, S, O). |
| |
| tokenize_charref(Bin, S=#decoder{offset=O}, Start) -> |
| case Bin of |
| <<_:O/binary>> -> |
| <<_:Start/binary, Raw/binary>> = Bin, |
| {{data, Raw, false}, S}; |
| <<_:O/binary, C, _/binary>> when ?IS_WHITESPACE(C) |
| orelse C =:= ?SQUOTE |
| orelse C =:= ?QUOTE |
| orelse C =:= $/ |
| orelse C =:= $> -> |
| Len = O - Start, |
| <<_:Start/binary, Raw:Len/binary, _/binary>> = Bin, |
| {{data, Raw, false}, S}; |
| <<_:O/binary, $;, _/binary>> -> |
| Len = O - Start, |
| <<_:Start/binary, Raw:Len/binary, _/binary>> = Bin, |
| Data = case mochiweb_charref:charref(Raw) of |
| undefined -> |
| Start1 = Start - 1, |
| Len1 = Len + 2, |
| <<_:Start1/binary, R:Len1/binary, _/binary>> = Bin, |
| R; |
| Unichar -> |
| list_to_binary(xmerl_ucs:to_utf8(Unichar)) |
| end, |
| {{data, Data, false}, ?INC_COL(S)}; |
| _ -> |
| tokenize_charref(Bin, ?INC_COL(S), Start) |
| end. |
| |
| tokenize_doctype(Bin, S) -> |
| tokenize_doctype(Bin, S, []). |
| |
| tokenize_doctype(Bin, S=#decoder{offset=O}, Acc) -> |
| case Bin of |
| <<_:O/binary>> -> |
| {{doctype, lists:reverse(Acc)}, S}; |
| <<_:O/binary, $>, _/binary>> -> |
| {{doctype, lists:reverse(Acc)}, ?INC_COL(S)}; |
| <<_:O/binary, C, _/binary>> when ?IS_WHITESPACE(C) -> |
| tokenize_doctype(Bin, ?INC_CHAR(S, C), Acc); |
| _ -> |
| {Word, S1} = tokenize_word_or_literal(Bin, S), |
| tokenize_doctype(Bin, S1, [Word | Acc]) |
| end. |
| |
| tokenize_word_or_literal(Bin, S=#decoder{offset=O}) -> |
| case Bin of |
| <<_:O/binary, C, _/binary>> when ?IS_WHITESPACE(C) -> |
| {error, {whitespace, [C], S}}; |
| <<_:O/binary, C, _/binary>> when C =:= ?QUOTE orelse C =:= ?SQUOTE -> |
| tokenize_word(Bin, ?INC_COL(S), C); |
| _ -> |
| tokenize_literal(Bin, S, []) |
| end. |
| |
| tokenize_word(Bin, S, Quote) -> |
| tokenize_word(Bin, S, Quote, []). |
| |
| tokenize_word(Bin, S=#decoder{offset=O}, Quote, Acc) -> |
| case Bin of |
| <<_:O/binary>> -> |
| {iolist_to_binary(lists:reverse(Acc)), S}; |
| <<_:O/binary, Quote, _/binary>> -> |
| {iolist_to_binary(lists:reverse(Acc)), ?INC_COL(S)}; |
| <<_:O/binary, $&, _/binary>> -> |
| {{data, Data, false}, S1} = tokenize_charref(Bin, ?INC_COL(S)), |
| tokenize_word(Bin, S1, Quote, [Data | Acc]); |
| <<_:O/binary, C, _/binary>> -> |
| tokenize_word(Bin, ?INC_CHAR(S, C), Quote, [C | Acc]) |
| end. |
| |
| tokenize_cdata(Bin, S=#decoder{offset=O}) -> |
| tokenize_cdata(Bin, S, O). |
| |
| tokenize_cdata(Bin, S=#decoder{offset=O}, Start) -> |
| case Bin of |
| <<_:O/binary, "]]>", _/binary>> -> |
| Len = O - Start, |
| <<_:Start/binary, Raw:Len/binary, _/binary>> = Bin, |
| {{data, Raw, false}, ?ADV_COL(S, 3)}; |
| <<_:O/binary, C, _/binary>> -> |
| tokenize_cdata(Bin, ?INC_CHAR(S, C), Start); |
| _ -> |
| <<_:O/binary, Raw/binary>> = Bin, |
| {{data, Raw, false}, S} |
| end. |
| |
| tokenize_comment(Bin, S=#decoder{offset=O}) -> |
| tokenize_comment(Bin, S, O). |
| |
| tokenize_comment(Bin, S=#decoder{offset=O}, Start) -> |
| case Bin of |
| <<_:O/binary, "-->", _/binary>> -> |
| Len = O - Start, |
| <<_:Start/binary, Raw:Len/binary, _/binary>> = Bin, |
| {{comment, Raw}, ?ADV_COL(S, 3)}; |
| <<_:O/binary, C, _/binary>> -> |
| tokenize_comment(Bin, ?INC_CHAR(S, C), Start); |
| <<_:Start/binary, Raw/binary>> -> |
| {{comment, Raw}, S} |
| end. |
| |
| tokenize_script(Bin, S=#decoder{offset=O}) -> |
| tokenize_script(Bin, S, O). |
| |
| tokenize_script(Bin, S=#decoder{offset=O}, Start) -> |
| case Bin of |
| %% Just a look-ahead, we want the end_tag separately |
| <<_:O/binary, $<, $/, SS, CC, RR, II, PP, TT, _/binary>> |
| when (SS =:= $s orelse SS =:= $S) andalso |
| (CC =:= $c orelse CC =:= $C) andalso |
| (RR =:= $r orelse RR =:= $R) andalso |
| (II =:= $i orelse II =:= $I) andalso |
| (PP =:= $p orelse PP =:= $P) andalso |
| (TT=:= $t orelse TT =:= $T) -> |
| Len = O - Start, |
| <<_:Start/binary, Raw:Len/binary, _/binary>> = Bin, |
| {{data, Raw, false}, S}; |
| <<_:O/binary, C, _/binary>> -> |
| tokenize_script(Bin, ?INC_CHAR(S, C), Start); |
| <<_:Start/binary, Raw/binary>> -> |
| {{data, Raw, false}, S} |
| end. |
| |
| tokenize_textarea(Bin, S=#decoder{offset=O}) -> |
| tokenize_textarea(Bin, S, O). |
| |
| tokenize_textarea(Bin, S=#decoder{offset=O}, Start) -> |
| case Bin of |
| %% Just a look-ahead, we want the end_tag separately |
| <<_:O/binary, $<, $/, TT, EE, XX, TT2, AA, RR, EE2, AA2, _/binary>> |
| when (TT =:= $t orelse TT =:= $T) andalso |
| (EE =:= $e orelse EE =:= $E) andalso |
| (XX =:= $x orelse XX =:= $X) andalso |
| (TT2 =:= $t orelse TT2 =:= $T) andalso |
| (AA =:= $a orelse AA =:= $A) andalso |
| (RR =:= $r orelse RR =:= $R) andalso |
| (EE2 =:= $e orelse EE2 =:= $E) andalso |
| (AA2 =:= $a orelse AA2 =:= $A) -> |
| Len = O - Start, |
| <<_:Start/binary, Raw:Len/binary, _/binary>> = Bin, |
| {{data, Raw, false}, S}; |
| <<_:O/binary, C, _/binary>> -> |
| tokenize_textarea(Bin, ?INC_CHAR(S, C), Start); |
| <<_:Start/binary, Raw/binary>> -> |
| {{data, Raw, false}, S} |
| end. |