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| -rw-r--r-- | src/mustache.erl | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/mustache.erl b/src/mustache.erl new file mode 100644 index 0000000..eca17cd --- /dev/null +++ b/src/mustache.erl @@ -0,0 +1,219 @@ +%% The MIT License +%% +%% Copyright (c) 2009 Tom Preston-Werner <tom@mojombo.com> +%% +%% Permission is hereby granted, free of charge, to any person obtaining a copy +%% of this software and associated documentation files (the "Software"), to deal +%% in the Software without restriction, including without limitation the rights +%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +%% copies of the Software, and to permit persons to whom the Software is +%% furnished to do so, subject to the following conditions: +%% +%% The above copyright notice and this permission notice shall be included in +%% all copies or substantial portions of the Software. +%% +%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +%% THE SOFTWARE. + +%% See the README at http://github.com/mojombo/mustache.erl for additional +%% documentation and usage examples. + +-module(mustache). %% v0.1.0 +-author("Tom Preston-Werner"). +-export([compile/1, compile/2, render/1, render/2, render/3, get/2, get/3, escape/1, start/1]). + +-record(mstate, {mod = undefined, + section_re = undefined, + tag_re = undefined}). + +compile(Body) when is_list(Body) -> + State = #mstate{}, + CompiledTemplate = pre_compile(Body, State), + % io:format("~p~n~n", [CompiledTemplate]), + % io:format(CompiledTemplate ++ "~n", []), + {ok, Tokens, _} = erl_scan:string(CompiledTemplate), + {ok, [Form]} = erl_parse:parse_exprs(Tokens), + Bindings = erl_eval:new_bindings(), + {value, Fun, _} = erl_eval:expr(Form, Bindings), + Fun; +compile(Mod) -> + TemplatePath = template_path(Mod), + compile(Mod, TemplatePath). + +compile(Mod, File) -> + code:purge(Mod), + code:load_file(Mod), + {ok, TemplateBin} = file:read_file(File), + Template = re:replace(TemplateBin, "\"", "\\\\\"", [global, {return,list}]), + State = #mstate{mod = Mod}, + CompiledTemplate = pre_compile(Template, State), + % io:format("~p~n~n", [CompiledTemplate]), + % io:format(CompiledTemplate ++ "~n", []), + {ok, Tokens, _} = erl_scan:string(CompiledTemplate), + {ok, [Form]} = erl_parse:parse_exprs(Tokens), + Bindings = erl_eval:new_bindings(), + {value, Fun, _} = erl_eval:expr(Form, Bindings), + Fun. + +render(Mod) -> + TemplatePath = template_path(Mod), + render(Mod, TemplatePath). + +render(Body, Ctx) when is_list(Body) -> + TFun = compile(Body), + render(undefined, TFun, Ctx); +render(Mod, File) when is_list(File) -> + render(Mod, File, dict:new()); +render(Mod, CompiledTemplate) -> + render(Mod, CompiledTemplate, dict:new()). + +render(Mod, File, Ctx) when is_list(File) -> + CompiledTemplate = compile(Mod, File), + render(Mod, CompiledTemplate, Ctx); +render(Mod, CompiledTemplate, Ctx) -> + Ctx2 = dict:store('__mod__', Mod, Ctx), + lists:flatten(CompiledTemplate(Ctx2)). + +pre_compile(T, State) -> + SectionRE = "\{\{\#([^\}]*)}}\s*(.+?){{\/\\1\}\}\s*", + {ok, CompiledSectionRE} = re:compile(SectionRE, [dotall]), + TagRE = "\{\{(#|=|!|<|>|\{)?(.+?)\\1?\}\}+", + {ok, CompiledTagRE} = re:compile(TagRE, [dotall]), + State2 = State#mstate{section_re = CompiledSectionRE, tag_re = CompiledTagRE}, + "fun(Ctx) -> " ++ + "CFun = fun(A, B) -> A end, " ++ + compiler(T, State2) ++ " end.". + +compiler(T, State) -> + Res = re:run(T, State#mstate.section_re), + case Res of + {match, [{M0, M1}, {N0, N1}, {C0, C1}]} -> + Front = string:substr(T, 1, M0), + Back = string:substr(T, M0 + M1 + 1), + Name = string:substr(T, N0 + 1, N1), + Content = string:substr(T, C0 + 1, C1), + "[" ++ compile_tags(Front, State) ++ + " | [" ++ compile_section(Name, Content, State) ++ + " | [" ++ compiler(Back, State) ++ "]]]"; + nomatch -> + compile_tags(T, State) + end. + +compile_section(Name, Content, State) -> + Mod = State#mstate.mod, + Result = compiler(Content, State), + "fun() -> " ++ + "case mustache:get(" ++ Name ++ ", Ctx, " ++ atom_to_list(Mod) ++ ") of " ++ + "true -> " ++ + Result ++ "; " ++ + "false -> " ++ + "[]; " ++ + "List when is_list(List) -> " ++ + "[fun(Ctx) -> " ++ Result ++ " end(dict:merge(CFun, SubCtx, Ctx)) || SubCtx <- List]; " ++ + "Else -> " ++ + "throw({template, io_lib:format(\"Bad context for ~p: ~p\", [" ++ Name ++ ", Else])}) " ++ + "end " ++ + "end()". + +compile_tags(T, State) -> + Res = re:run(T, State#mstate.tag_re), + case Res of + {match, [{M0, M1}, K, {C0, C1}]} -> + Front = string:substr(T, 1, M0), + Back = string:substr(T, M0 + M1 + 1), + Content = string:substr(T, C0 + 1, C1), + Kind = tag_kind(T, K), + Result = compile_tag(Kind, Content, State), + "[\"" ++ Front ++ + "\" | [" ++ Result ++ + " | " ++ compile_tags(Back, State) ++ "]]"; + nomatch -> + "[\"" ++ T ++ "\"]" + end. + +tag_kind(_T, {-1, 0}) -> + none; +tag_kind(T, {K0, K1}) -> + string:substr(T, K0 + 1, K1). + +compile_tag(none, Content, State) -> + Mod = State#mstate.mod, + "mustache:escape(mustache:get(" ++ Content ++ ", Ctx, " ++ atom_to_list(Mod) ++ "))"; +compile_tag("{", Content, State) -> + Mod = State#mstate.mod, + "mustache:get(" ++ Content ++ ", Ctx, " ++ atom_to_list(Mod) ++ ")"; +compile_tag("!", _Content, _State) -> + "[]". + +template_path(Mod) -> + ModPath = code:which(Mod), + re:replace(ModPath, "\.beam$", ".mustache", [{return, list}]). + +get(Key, Ctx) when is_list(Key) -> + {ok, Mod} = dict:find('__mod__', Ctx), + get(list_to_atom(Key), Ctx, Mod); +get(Key, Ctx) -> + {ok, Mod} = dict:find('__mod__', Ctx), + get(Key, Ctx, Mod). + +get(Key, Ctx, Mod) when is_list(Key) -> + get(list_to_atom(Key), Ctx, Mod); +get(Key, Ctx, Mod) -> + case dict:find(Key, Ctx) of + {ok, Val} -> + % io:format("From Ctx {~p, ~p}~n", [Key, Val]), + to_s(Val); + error -> + case erlang:function_exported(Mod, Key, 1) of + true -> + Val = to_s(apply(Mod, Key, [Ctx])), + % io:format("From Mod/1 {~p, ~p}~n", [Key, Val]), + Val; + false -> + case erlang:function_exported(Mod, Key, 0) of + true -> + Val = to_s(apply(Mod, Key, [])), + % io:format("From Mod/0 {~p, ~p}~n", [Key, Val]), + Val; + false -> + [] + end + end + end. + +to_s(Val) when is_integer(Val) -> + integer_to_list(Val); +to_s(Val) when is_float(Val) -> + io_lib:format("~.2f", [Val]); +to_s(Val) when is_boolean(Val) -> + Val; +to_s(Val) when is_atom(Val) -> + atom_to_list(Val); +to_s(Val) -> + Val. + +escape(HTML) -> + escape(HTML, []). + +escape([], Acc) -> + 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([X | Rest], Acc) -> + escape(Rest, [X | Acc]). + +%%--------------------------------------------------------------------------- + +start([T]) -> + Out = render(list_to_atom(T)), + io:format(Out ++ "~n", []). +
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