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erlydtl_compiler.erl
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erlydtl_compiler.erl
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%%%-------------------------------------------------------------------
%%% File: erlydtl_compiler.erl
%%% @author Roberto Saccon <rsaccon@gmail.com> [http://rsaccon.com]
%%% @author Evan Miller <emmiller@gmail.com>
%%% @copyright 2008 Roberto Saccon, Evan Miller
%%% @doc
%%% ErlyDTL template compiler
%%% @end
%%%
%%% The MIT License
%%%
%%% Copyright (c) 2007 Roberto Saccon, Evan Miller
%%%
%%% 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.
%%%
%%% @since 2007-12-16 by Roberto Saccon, Evan Miller
%%%-------------------------------------------------------------------
-module(erlydtl_compiler).
-author('rsaccon@gmail.com').
-author('emmiller@gmail.com').
%% --------------------------------------------------------------------
%% Definitions
%% --------------------------------------------------------------------
-export([compile/2, compile/3, compile_dir/2, compile_dir/3, parse/1]).
-record(dtl_context, {
local_scopes = [],
block_dict = dict:new(),
blocktrans_fun = none,
blocktrans_locales = [],
auto_escape = off,
doc_root = "",
parse_trail = [],
vars = [],
custom_tags_dir = [],
custom_tags_module = none,
reader = {file, read_file},
module = [],
compiler_options = [verbose, report_errors],
force_recompile = false,
locale = none}).
-record(ast_info, {
dependencies = [],
translatable_strings = [],
translatable_blocks= [],
custom_tags = [],
var_names = [],
pre_render_asts = []}).
-record(treewalker, {
counter = 0,
safe = false
}).
compile(Binary, Module) when is_binary(Binary) ->
compile(Binary, Module, []);
compile(File, Module) ->
compile(File, Module, []).
compile(Binary, Module, Options) when is_binary(Binary) ->
File = "",
CheckSum = "",
case parse(Binary) of
{ok, DjangoParseTree} ->
case compile_to_binary(File, DjangoParseTree,
init_dtl_context(File, Module, Options), CheckSum) of
{ok, Module1, _} ->
{ok, Module1};
Err ->
Err
end;
Err ->
Err
end;
compile(File, Module, Options) ->
Context = init_dtl_context(File, Module, Options),
case parse(File, Context) of
ok ->
ok;
{ok, DjangoParseTree, CheckSum} ->
case compile_to_binary(File, DjangoParseTree, Context, CheckSum) of
{ok, Module1, Bin} ->
write_binary(Module1, Bin, Options);
Err ->
Err
end;
Err ->
Err
end.
compile_dir(Dir, Module) ->
compile_dir(Dir, Module, []).
compile_dir(Dir, Module, Options) ->
Context = init_dtl_context_dir(Dir, Module, Options),
Files = filelib:fold_files(Dir, ".*", true, fun(F1,Acc1) -> [F1 | Acc1] end, []),
{ParserResults, ParserErrors} = lists:foldl(fun
("."++_, Acc) -> Acc;
(File, {ResultAcc, ErrorAcc}) ->
FilePath = filename:join([Dir, File]),
case filelib:is_dir(FilePath) of
true ->
{ResultAcc, ErrorAcc};
false ->
case parse(FilePath, Context) of
ok -> {ResultAcc, ErrorAcc};
{ok, DjangoParseTree, CheckSum} -> {[{File, DjangoParseTree, CheckSum}|ResultAcc], ErrorAcc};
Err -> {ResultAcc, [Err|ErrorAcc]}
end
end
end, {[], []}, Files),
case ParserErrors of
[] ->
case compile_multiple_to_binary(Dir, ParserResults, Context) of
{ok, Module1, Bin} ->
write_binary(Module1, Bin, Options);
Err ->
Err
end;
[Error|_] ->
Error
end.
%%====================================================================
%% Internal functions
%%====================================================================
write_binary(Module1, Bin, Options) ->
case proplists:get_value(out_dir, Options) of
undefined ->
ok;
OutDir ->
BeamFile = filename:join([OutDir, atom_to_list(Module1) ++ ".beam"]),
case file:write_file(BeamFile, Bin) of
ok ->
ok;
{error, Reason} ->
{error, lists:concat(["beam generation failed (", Reason, "): ", BeamFile])}
end
end.
compile_multiple_to_binary(Dir, ParserResults, Context) ->
{Functions, {AstInfo, _}} = lists:mapfoldl(fun({File, DjangoParseTree, CheckSum}, {AstInfo, TreeWalker}) ->
FilePath = full_path(File, Context#dtl_context.doc_root),
{{BodyAst, BodyInfo}, TreeWalker1} = with_dependency({FilePath, CheckSum}, body_ast(DjangoParseTree, Context, TreeWalker)),
FunctionName = filename:rootname(filename:basename(File)),
Function1 = erl_syntax:function(erl_syntax:atom(FunctionName),
[erl_syntax:clause([erl_syntax:variable("Variables")], none,
[erl_syntax:application(none, erl_syntax:atom(FunctionName),
[erl_syntax:variable("Variables"), erl_syntax:atom(none)])])]),
Function2 = erl_syntax:function(erl_syntax:atom(FunctionName),
[erl_syntax:clause([erl_syntax:variable("Variables"), erl_syntax:variable("TranslationFun")], none,
[BodyAst])]),
{{FunctionName, Function1, Function2}, {merge_info(AstInfo, BodyInfo), TreeWalker1}}
end, {#ast_info{}, #treewalker{}}, ParserResults),
Forms = custom_forms(Dir, Context#dtl_context.module, Functions, AstInfo),
compile_forms_and_reload(Dir, Forms, Context#dtl_context.compiler_options).
compile_to_binary(File, DjangoParseTree, Context, CheckSum) ->
try body_ast(DjangoParseTree, Context, #treewalker{}) of
{{BodyAst, BodyInfo}, BodyTreeWalker} ->
try custom_tags_ast(BodyInfo#ast_info.custom_tags, Context, BodyTreeWalker) of
{{CustomTagsAst, CustomTagsInfo}, _} ->
Forms = forms(File, Context#dtl_context.module, {BodyAst, BodyInfo}, {CustomTagsAst, CustomTagsInfo}, CheckSum),
compile_forms_and_reload(File, Forms, Context#dtl_context.compiler_options)
catch
throw:Error -> Error
end
catch
throw:Error -> Error
end.
compile_forms_and_reload(File, Forms, CompilerOptions) ->
case compile:forms(Forms, CompilerOptions) of
{ok, Module1, Bin} ->
code:purge(Module1),
case code:load_binary(Module1, atom_to_list(Module1) ++ ".erl", Bin) of
{module, _} -> {ok, Module1, Bin};
_ -> {error, lists:concat(["code reload failed: ", Module1])}
end;
error ->
{error, lists:concat(["compilation failed: ", File])};
OtherError ->
OtherError
end.
init_dtl_context(File, Module, Options) when is_list(Module) ->
init_dtl_context(File, list_to_atom(Module), Options);
init_dtl_context(File, Module, Options) ->
Ctx = #dtl_context{},
#dtl_context{
parse_trail = [File],
module = Module,
doc_root = proplists:get_value(doc_root, Options, filename:dirname(File)),
custom_tags_dir = proplists:get_value(custom_tags_dir, Options, filename:join([erlydtl_deps:get_base_dir(), "priv", "custom_tags"])),
custom_tags_module = proplists:get_value(custom_tags_module, Options, Ctx#dtl_context.custom_tags_module),
blocktrans_fun = proplists:get_value(blocktrans_fun, Options, Ctx#dtl_context.blocktrans_fun),
blocktrans_locales = proplists:get_value(blocktrans_locales, Options, Ctx#dtl_context.blocktrans_locales),
vars = proplists:get_value(vars, Options, Ctx#dtl_context.vars),
reader = proplists:get_value(reader, Options, Ctx#dtl_context.reader),
compiler_options = proplists:get_value(compiler_options, Options, Ctx#dtl_context.compiler_options),
force_recompile = proplists:get_value(force_recompile, Options, Ctx#dtl_context.force_recompile),
locale = proplists:get_value(locale, Options, Ctx#dtl_context.locale)}.
init_dtl_context_dir(Dir, Module, Options) when is_list(Module) ->
init_dtl_context_dir(Dir, list_to_atom(Module), Options);
init_dtl_context_dir(Dir, Module, Options) ->
Ctx = #dtl_context{},
#dtl_context{
parse_trail = [],
module = Module,
doc_root = proplists:get_value(doc_root, Options, Dir),
custom_tags_dir = proplists:get_value(custom_tags_dir, Options, filename:join([erlydtl_deps:get_base_dir(), "priv", "custom_tags"])),
custom_tags_module = proplists:get_value(custom_tags_module, Options, Module),
blocktrans_fun = proplists:get_value(blocktrans_fun, Options, Ctx#dtl_context.blocktrans_fun),
blocktrans_locales = proplists:get_value(blocktrans_locales, Options, Ctx#dtl_context.blocktrans_locales),
vars = proplists:get_value(vars, Options, Ctx#dtl_context.vars),
reader = proplists:get_value(reader, Options, Ctx#dtl_context.reader),
compiler_options = proplists:get_value(compiler_options, Options, Ctx#dtl_context.compiler_options),
force_recompile = proplists:get_value(force_recompile, Options, Ctx#dtl_context.force_recompile),
locale = proplists:get_value(locale, Options, Ctx#dtl_context.locale)}.
is_up_to_date(_, #dtl_context{force_recompile = true}) ->
false;
is_up_to_date(CheckSum, Context) ->
Module = Context#dtl_context.module,
{M, F} = Context#dtl_context.reader,
case catch Module:source() of
{_, CheckSum} ->
case catch Module:dependencies() of
L when is_list(L) ->
RecompileList = lists:foldl(fun
({XFile, XCheckSum}, Acc) ->
case catch M:F(XFile) of
{ok, Data} ->
case binary_to_list(erlang:md5(Data)) of
XCheckSum ->
Acc;
_ ->
[recompile | Acc]
end;
_ ->
[recompile | Acc]
end
end, [], L),
case RecompileList of
[] -> true;
_ -> false
end;
_ ->
false
end;
_ ->
false
end.
parse(File, Context) ->
{M, F} = Context#dtl_context.reader,
case catch M:F(File) of
{ok, Data} ->
CheckSum = binary_to_list(erlang:md5(Data)),
case parse(CheckSum, Data, Context) of
{error, Msg} when is_list(Msg) ->
{error, File ++ ": " ++ Msg};
{error, Msg} ->
{error, {File, [Msg]}};
Result ->
Result
end;
_ ->
{error, {File, [{0, Context#dtl_context.module, "Failed to read file"}]}}
end.
parse(CheckSum, Data, Context) ->
case is_up_to_date(CheckSum, Context) of
true ->
ok;
_ ->
case parse(Data) of
{ok, Val} ->
{ok, Val, CheckSum};
Err ->
Err
end
end.
parse(Data) ->
case erlydtl_scanner:scan(unicode:characters_to_list(Data)) of
{ok, Tokens} ->
erlydtl_parser:parse(Tokens);
Err ->
Err
end.
custom_tags_ast(CustomTags, Context, TreeWalker) ->
{{CustomTagsClauses, CustomTagsInfo}, TreeWalker1} = custom_tags_clauses_ast(CustomTags, Context, TreeWalker),
{{erl_syntax:function(erl_syntax:atom(render_tag), CustomTagsClauses), CustomTagsInfo}, TreeWalker1}.
custom_tags_clauses_ast(CustomTags, Context, TreeWalker) ->
custom_tags_clauses_ast1(CustomTags, [], [], #ast_info{}, Context, TreeWalker).
custom_tags_clauses_ast1([], _ExcludeTags, ClauseAcc, InfoAcc, _Context, TreeWalker) ->
{{lists:reverse([erl_syntax:clause([erl_syntax:underscore(), erl_syntax:underscore(), erl_syntax:underscore()], none,
[erl_syntax:list([])])|ClauseAcc]), InfoAcc}, TreeWalker};
custom_tags_clauses_ast1([Tag|CustomTags], ExcludeTags, ClauseAcc, InfoAcc, Context, TreeWalker) ->
case lists:member(Tag, ExcludeTags) of
true ->
custom_tags_clauses_ast1(CustomTags, ExcludeTags, ClauseAcc, InfoAcc, Context, TreeWalker);
false ->
CustomTagFile = full_path(Tag, Context#dtl_context.custom_tags_dir),
case parse(CustomTagFile, Context) of
{ok, DjangoParseTree, CheckSum} ->
{{BodyAst, BodyAstInfo}, TreeWalker1} = with_dependency({CustomTagFile, CheckSum},
body_ast(DjangoParseTree, Context, TreeWalker)),
Clause = erl_syntax:clause([erl_syntax:string(Tag), erl_syntax:variable("Variables"), options_ast()],
none, [BodyAst]),
custom_tags_clauses_ast1(CustomTags, [Tag|ExcludeTags], [Clause|ClauseAcc], merge_info(BodyAstInfo, InfoAcc),
Context, TreeWalker1);
Error ->
throw(Error)
end
end.
dependencies_function(Dependencies) ->
erl_syntax:function(
erl_syntax:atom(dependencies), [erl_syntax:clause([], none,
[erl_syntax:list(lists:map(fun
({XFile, XCheckSum}) ->
erl_syntax:tuple([erl_syntax:string(XFile), erl_syntax:string(XCheckSum)])
end, Dependencies))])]).
translatable_strings_function(TranslatableStrings) ->
erl_syntax:function(
erl_syntax:atom(translatable_strings), [erl_syntax:clause([], none,
[erl_syntax:list(lists:map(fun(String) -> erl_syntax:string(String) end,
TranslatableStrings))])]).
custom_forms(Dir, Module, Functions, AstInfo) ->
ModuleAst = erl_syntax:attribute(erl_syntax:atom(module), [erl_syntax:atom(Module)]),
ExportAst = erl_syntax:attribute(erl_syntax:atom(export),
[erl_syntax:list([
erl_syntax:arity_qualifier(erl_syntax:atom(source_dir), erl_syntax:integer(0)),
erl_syntax:arity_qualifier(erl_syntax:atom(dependencies), erl_syntax:integer(0)),
erl_syntax:arity_qualifier(erl_syntax:atom(translatable_strings), erl_syntax:integer(0))
|
lists:foldl(fun({FunctionName, _, _}, Acc) ->
[erl_syntax:arity_qualifier(erl_syntax:atom(FunctionName), erl_syntax:integer(1)),
erl_syntax:arity_qualifier(erl_syntax:atom(FunctionName), erl_syntax:integer(2))|Acc]
end, [], Functions)]
)]),
SourceFunctionAst = erl_syntax:function(
erl_syntax:atom(source_dir), [erl_syntax:clause([], none, [erl_syntax:string(Dir)])]),
DependenciesFunctionAst = dependencies_function(AstInfo#ast_info.dependencies),
TranslatableStringsFunctionAst = translatable_strings_function(AstInfo#ast_info.translatable_strings),
FunctionAsts = lists:foldl(fun({_, Function1, Function2}, Acc) -> [Function1, Function2 | Acc] end, [], Functions),
[erl_syntax:revert(X) || X <- [ModuleAst, ExportAst, SourceFunctionAst, DependenciesFunctionAst, TranslatableStringsFunctionAst
| FunctionAsts] ++ AstInfo#ast_info.pre_render_asts].
forms(File, Module, {BodyAst, BodyInfo}, {CustomTagsFunctionAst, CustomTagsInfo}, CheckSum) ->
MergedInfo = merge_info(BodyInfo, CustomTagsInfo),
Render0FunctionAst = erl_syntax:function(erl_syntax:atom(render),
[erl_syntax:clause([], none, [erl_syntax:application(none,
erl_syntax:atom(render), [erl_syntax:list([])])])]),
Render1FunctionAst = erl_syntax:function(erl_syntax:atom(render),
[erl_syntax:clause([erl_syntax:variable("Variables")], none,
[erl_syntax:application(none,
erl_syntax:atom(render),
[erl_syntax:variable("Variables"), erl_syntax:list([])])])]),
Function2 = erl_syntax:application(none, erl_syntax:atom(render_internal),
[erl_syntax:variable("Variables"),
erl_syntax:application(
erl_syntax:atom(proplists),
erl_syntax:atom(get_value),
[erl_syntax:atom(translation_fun), erl_syntax:variable("Options"), erl_syntax:atom(none)]),
erl_syntax:application(
erl_syntax:atom(proplists),
erl_syntax:atom(get_value),
[erl_syntax:atom(locale), erl_syntax:variable("Options"), erl_syntax:atom(none)])
]),
ClauseOk = erl_syntax:clause([erl_syntax:variable("Val")], none,
[erl_syntax:tuple([erl_syntax:atom(ok), erl_syntax:variable("Val")])]),
ClauseCatch = erl_syntax:clause([erl_syntax:variable("Err")], none,
[erl_syntax:tuple([erl_syntax:atom(error), erl_syntax:variable("Err")])]),
Render2FunctionAst = erl_syntax:function(erl_syntax:atom(render),
[erl_syntax:clause([erl_syntax:variable("Variables"),
erl_syntax:variable("Options")], none,
[erl_syntax:try_expr([Function2], [ClauseOk], [ClauseCatch])])]),
SourceFunctionTuple = erl_syntax:tuple(
[erl_syntax:string(File), erl_syntax:string(CheckSum)]),
SourceFunctionAst = erl_syntax:function(
erl_syntax:atom(source),
[erl_syntax:clause([], none, [SourceFunctionTuple])]),
DependenciesFunctionAst = dependencies_function(MergedInfo#ast_info.dependencies),
TranslatableStringsAst = translatable_strings_function(MergedInfo#ast_info.translatable_strings),
BodyAstTmp = erl_syntax:application(
erl_syntax:atom(erlydtl_runtime),
erl_syntax:atom(stringify_final),
[BodyAst]),
RenderInternalFunctionAst = erl_syntax:function(
erl_syntax:atom(render_internal),
[erl_syntax:clause([erl_syntax:variable("Variables"), erl_syntax:variable("TranslationFun"), erl_syntax:variable("CurrentLocale")], none,
[BodyAstTmp])]),
ModuleAst = erl_syntax:attribute(erl_syntax:atom(module), [erl_syntax:atom(Module)]),
ExportAst = erl_syntax:attribute(erl_syntax:atom(export),
[erl_syntax:list([erl_syntax:arity_qualifier(erl_syntax:atom(render), erl_syntax:integer(0)),
erl_syntax:arity_qualifier(erl_syntax:atom(render), erl_syntax:integer(1)),
erl_syntax:arity_qualifier(erl_syntax:atom(render), erl_syntax:integer(2)),
erl_syntax:arity_qualifier(erl_syntax:atom(source), erl_syntax:integer(0)),
erl_syntax:arity_qualifier(erl_syntax:atom(dependencies), erl_syntax:integer(0)),
erl_syntax:arity_qualifier(erl_syntax:atom(translatable_strings), erl_syntax:integer(0))])]),
[erl_syntax:revert(X) || X <- [ModuleAst, ExportAst, Render0FunctionAst, Render1FunctionAst, Render2FunctionAst,
SourceFunctionAst, DependenciesFunctionAst, TranslatableStringsAst, RenderInternalFunctionAst, CustomTagsFunctionAst
| BodyInfo#ast_info.pre_render_asts]].
% child templates should only consist of blocks at the top level
body_ast([{extends, {string_literal, _Pos, String}} | ThisParseTree], Context, TreeWalker) ->
File = full_path(unescape_string_literal(String), Context#dtl_context.doc_root),
case lists:member(File, Context#dtl_context.parse_trail) of
true ->
throw({error, "Circular file inclusion!"});
_ ->
case parse(File, Context) of
{ok, ParentParseTree, CheckSum} ->
BlockDict = lists:foldl(
fun
({block, {identifier, _, Name}, Contents}, Dict) ->
dict:store(Name, Contents, Dict);
(_, Dict) ->
Dict
end, dict:new(), ThisParseTree),
with_dependency({File, CheckSum}, body_ast(ParentParseTree, Context#dtl_context{
block_dict = dict:merge(fun(_Key, _ParentVal, ChildVal) -> ChildVal end,
BlockDict, Context#dtl_context.block_dict),
parse_trail = [File | Context#dtl_context.parse_trail]}, TreeWalker));
Err ->
throw(Err)
end
end;
body_ast(DjangoParseTree, Context, TreeWalker) ->
{AstInfoList, TreeWalker2} = lists:mapfoldl(
fun
({'autoescape', {identifier, _, OnOrOff}, Contents}, TreeWalkerAcc) ->
body_ast(Contents, Context#dtl_context{auto_escape = OnOrOff},
TreeWalkerAcc);
({'block', {identifier, _, Name}, Contents}, TreeWalkerAcc) ->
Block = case dict:find(Name, Context#dtl_context.block_dict) of
{ok, ChildBlock} -> ChildBlock;
_ -> Contents
end,
body_ast(Block, Context, TreeWalkerAcc);
({'blocktrans', {identifier, _, Name}, Args, Contents}, TreeWalkerAcc) ->
blocktrans_ast(Name, Args, Contents, Context, TreeWalkerAcc);
({'call', {'identifier', _, Name}}, TreeWalkerAcc) ->
call_ast(Name, TreeWalkerAcc);
({'call', {'identifier', _, Name}, With}, TreeWalkerAcc) ->
call_with_ast(Name, With, Context, TreeWalkerAcc);
({'comment', _Contents}, TreeWalkerAcc) ->
empty_ast(TreeWalkerAcc);
({'cycle', Names}, TreeWalkerAcc) ->
cycle_ast(Names, Context, TreeWalkerAcc);
({'cycle_compat', Names}, TreeWalkerAcc) ->
cycle_compat_ast(Names, Context, TreeWalkerAcc);
({'date', 'now', {string_literal, _Pos, FormatString}}, TreeWalkerAcc) ->
now_ast(FormatString, Context, TreeWalkerAcc);
({'filter', FilterList, Contents}, TreeWalkerAcc) ->
filter_tag_ast(FilterList, Contents, Context, TreeWalkerAcc);
({'firstof', Vars}, TreeWalkerAcc) ->
firstof_ast(Vars, Context, TreeWalkerAcc);
({'for', {'in', IteratorList, Variable}, Contents}, TreeWalkerAcc) ->
{EmptyAstInfo, TreeWalker1} = empty_ast(TreeWalkerAcc),
for_loop_ast(IteratorList, Variable, Contents, EmptyAstInfo, Context, TreeWalker1);
({'for', {'in', IteratorList, Variable}, Contents, EmptyPartContents}, TreeWalkerAcc) ->
{EmptyAstInfo, TreeWalker1} = body_ast(EmptyPartContents, Context, TreeWalkerAcc),
for_loop_ast(IteratorList, Variable, Contents, EmptyAstInfo, Context, TreeWalker1);
({'if', Expression, Contents}, TreeWalkerAcc) ->
{IfAstInfo, TreeWalker1} = body_ast(Contents, Context, TreeWalkerAcc),
{ElseAstInfo, TreeWalker2} = empty_ast(TreeWalker1),
ifelse_ast(Expression, IfAstInfo, ElseAstInfo, Context, TreeWalker2);
({'ifelse', Expression, IfContents, ElseContents}, TreeWalkerAcc) ->
{IfAstInfo, TreeWalker1} = body_ast(IfContents, Context, TreeWalkerAcc),
{ElseAstInfo, TreeWalker2} = body_ast(ElseContents, Context, TreeWalker1),
ifelse_ast(Expression, IfAstInfo, ElseAstInfo, Context, TreeWalker2);
({'ifequal', [Arg1, Arg2], Contents}, TreeWalkerAcc) ->
{IfAstInfo, TreeWalker1} = body_ast(Contents, Context, TreeWalkerAcc),
{ElseAstInfo, TreeWalker2} = empty_ast(TreeWalker1),
ifelse_ast({'expr', "eq", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2);
({'ifequalelse', [Arg1, Arg2], IfContents, ElseContents}, TreeWalkerAcc) ->
{IfAstInfo, TreeWalker1} = body_ast(IfContents, Context, TreeWalkerAcc),
{ElseAstInfo, TreeWalker2} = body_ast(ElseContents, Context,TreeWalker1),
ifelse_ast({'expr', "eq", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2);
({'ifnotequal', [Arg1, Arg2], Contents}, TreeWalkerAcc) ->
{IfAstInfo, TreeWalker1} = body_ast(Contents, Context, TreeWalkerAcc),
{ElseAstInfo, TreeWalker2} = empty_ast(TreeWalker1),
ifelse_ast({'expr', "ne", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2);
({'ifnotequalelse', [Arg1, Arg2], IfContents, ElseContents}, TreeWalkerAcc) ->
{IfAstInfo, TreeWalker1} = body_ast(IfContents, Context, TreeWalkerAcc),
{ElseAstInfo, TreeWalker2} = body_ast(ElseContents, Context, TreeWalker1),
ifelse_ast({'expr', "ne", Arg1, Arg2}, IfAstInfo, ElseAstInfo, Context, TreeWalker2);
({'include', {string_literal, _, File}, Args}, TreeWalkerAcc) ->
include_ast(unescape_string_literal(File), Args, Context#dtl_context.local_scopes, Context, TreeWalkerAcc);
({'include_only', {string_literal, _, File}, Args}, TreeWalkerAcc) ->
include_ast(unescape_string_literal(File), Args, [], Context, TreeWalkerAcc);
({'spaceless', Contents}, TreeWalkerAcc) ->
spaceless_ast(Contents, Context, TreeWalkerAcc);
({'ssi', Arg}, TreeWalkerAcc) ->
ssi_ast(Arg, Context, TreeWalkerAcc);
({'ssi_parsed', {string_literal, _, FileName}}, TreeWalkerAcc) ->
include_ast(unescape_string_literal(FileName), [], Context#dtl_context.local_scopes, Context, TreeWalkerAcc);
({'string', _Pos, String}, TreeWalkerAcc) ->
string_ast(String, TreeWalkerAcc);
({'tag', {'identifier', _, Name}, Args}, TreeWalkerAcc) ->
tag_ast(Name, Args, Context, TreeWalkerAcc);
({'templatetag', {_, _, TagName}}, TreeWalkerAcc) ->
templatetag_ast(TagName, Context, TreeWalkerAcc);
({'trans', Value}, TreeWalkerAcc) ->
translated_ast(Value, Context, TreeWalkerAcc);
({'widthratio', Numerator, Denominator, Scale}, TreeWalkerAcc) ->
widthratio_ast(Numerator, Denominator, Scale, Context, TreeWalkerAcc);
({'with', Args, Contents}, TreeWalkerAcc) ->
with_ast(Args, Contents, Context, TreeWalkerAcc);
(ValueToken, TreeWalkerAcc) ->
{{ValueAst,ValueInfo},ValueTreeWalker} = value_ast(ValueToken, true, Context, TreeWalkerAcc),
{{format(ValueAst, Context, ValueTreeWalker),ValueInfo},ValueTreeWalker}
end, TreeWalker, DjangoParseTree),
{AstList, {Info, TreeWalker3}} = lists:mapfoldl(
fun({Ast, Info}, {InfoAcc, TreeWalkerAcc}) ->
PresetVars = lists:foldl(fun
(X, Acc) ->
case proplists:lookup(X, Context#dtl_context.vars) of
none ->
Acc;
Val ->
[erl_syntax:abstract(Val) | Acc]
end
end, [], Info#ast_info.var_names),
case PresetVars of
[] ->
{Ast, {merge_info(Info, InfoAcc), TreeWalkerAcc}};
_ ->
Counter = TreeWalkerAcc#treewalker.counter,
Name = lists:concat([pre_render, Counter]),
Ast1 = erl_syntax:application(none, erl_syntax:atom(Name),
[erl_syntax:list(PresetVars)]),
PreRenderAst = erl_syntax:function(erl_syntax:atom(Name),
[erl_syntax:clause([erl_syntax:variable("Variables")], none, [Ast])]),
PreRenderAsts = Info#ast_info.pre_render_asts,
Info1 = Info#ast_info{pre_render_asts = [PreRenderAst | PreRenderAsts]},
{Ast1, {merge_info(Info1, InfoAcc), TreeWalkerAcc#treewalker{counter = Counter + 1}}}
end
end, {#ast_info{}, TreeWalker2}, AstInfoList),
{{erl_syntax:list(AstList), Info}, TreeWalker3}.
value_ast(ValueToken, AsString, Context, TreeWalker) ->
case ValueToken of
{'expr', Operator, Value} ->
{{ValueAst,InfoValue}, TreeWalker1} = value_ast(Value, false, Context, TreeWalker),
Ast = erl_syntax:application(erl_syntax:atom(erlydtl_runtime),
erl_syntax:atom(Operator),
[ValueAst]),
{{Ast, InfoValue}, TreeWalker1};
{'expr', Operator, Value1, Value2} ->
{{Value1Ast,InfoValue1}, TreeWalker1} = value_ast(Value1, false, Context, TreeWalker),
{{Value2Ast,InfoValue2}, TreeWalker2} = value_ast(Value2, false, Context, TreeWalker1),
Ast = erl_syntax:application(erl_syntax:atom(erlydtl_runtime),
erl_syntax:atom(Operator),
[Value1Ast, Value2Ast]),
{{Ast, merge_info(InfoValue1,InfoValue2)}, TreeWalker2};
{'string_literal', _Pos, String} ->
{{erl_syntax:string(unescape_string_literal(String)), #ast_info{}}, TreeWalker};
{'number_literal', _Pos, Number} ->
case AsString of
true -> string_ast(Number, TreeWalker);
false -> {{erl_syntax:integer(list_to_integer(Number)), #ast_info{}}, TreeWalker}
end;
{'apply_filter', Variable, Filter} ->
filter_ast(Variable, Filter, Context, TreeWalker);
{'attribute', _} = Variable ->
{Ast, VarName} = resolve_variable_ast(Variable, Context),
{{Ast, #ast_info{var_names = [VarName]}}, TreeWalker};
{'variable', _} = Variable ->
{Ast, VarName} = resolve_variable_ast(Variable, Context),
{{Ast, #ast_info{var_names = [VarName]}}, TreeWalker}
end.
merge_info(Info1, Info2) ->
#ast_info{
dependencies =
lists:merge(
lists:sort(Info1#ast_info.dependencies),
lists:sort(Info2#ast_info.dependencies)),
var_names =
lists:merge(
lists:sort(Info1#ast_info.var_names),
lists:sort(Info2#ast_info.var_names)),
translatable_strings =
lists:merge(
lists:sort(Info1#ast_info.translatable_strings),
lists:sort(Info2#ast_info.translatable_strings)),
custom_tags =
lists:merge(
lists:sort(Info1#ast_info.custom_tags),
lists:sort(Info2#ast_info.custom_tags)),
pre_render_asts =
lists:merge(
Info1#ast_info.pre_render_asts,
Info2#ast_info.pre_render_asts)}.
with_dependencies([], Args) ->
Args;
with_dependencies([Dependency | Rest], Args) ->
with_dependencies(Rest, with_dependency(Dependency, Args)).
with_dependency(FilePath, {{Ast, Info}, TreeWalker}) ->
{{Ast, Info#ast_info{dependencies = [FilePath | Info#ast_info.dependencies]}}, TreeWalker}.
empty_ast(TreeWalker) ->
{{erl_syntax:list([]), #ast_info{}}, TreeWalker}.
blocktrans_ast(Name, ArgList, Contents, Context, TreeWalker) ->
{NewScope, {ArgInfo, TreeWalker1}} = lists:mapfoldl(fun
({{identifier, _, LocalVarName}, Value}, {AstInfo1, TreeWalker1}) ->
{{Ast, Info}, TreeWalker2} = value_ast(Value, false, Context, TreeWalker1),
{{LocalVarName, Ast}, {merge_info(AstInfo1, Info), TreeWalker2}}
end, {#ast_info{}, TreeWalker}, ArgList),
NewContext = Context#dtl_context{ local_scopes = [NewScope|Context#dtl_context.local_scopes] },
{{DefaultAst, AstInfo}, TreeWalker2} = body_ast(Contents, NewContext, TreeWalker1),
MergedInfo = merge_info(AstInfo, ArgInfo),
case Context#dtl_context.blocktrans_fun of
none ->
{{DefaultAst, MergedInfo}, TreeWalker2};
BlockTransFun when is_function(BlockTransFun) ->
{FinalAstInfo, FinalTreeWalker, Clauses} = lists:foldr(fun(Locale, {AstInfoAcc, ThisTreeWalker, ClauseAcc}) ->
case BlockTransFun(Name, Locale) of
default ->
{AstInfoAcc, ThisTreeWalker, ClauseAcc};
Body ->
{ok, DjangoParseTree} = parse(Body),
{{ThisAst, ThisAstInfo}, TreeWalker3} = body_ast(DjangoParseTree, NewContext, ThisTreeWalker),
{merge_info(ThisAstInfo, AstInfoAcc), TreeWalker3,
[erl_syntax:clause([erl_syntax:string(Locale)], none, [ThisAst])|ClauseAcc]}
end
end, {MergedInfo, TreeWalker2, []}, Context#dtl_context.blocktrans_locales),
Ast = erl_syntax:case_expr(erl_syntax:variable("CurrentLocale"),
Clauses ++ [erl_syntax:clause([erl_syntax:underscore()], none, [DefaultAst])]),
{{Ast, FinalAstInfo}, FinalTreeWalker}
end.
translated_ast({string_literal, _, String}, Context, TreeWalker) ->
NewStr = unescape_string_literal(String),
DefaultString = case Context#dtl_context.locale of
none -> NewStr;
Locale -> erlydtl_i18n:translate(NewStr,Locale)
end,
translated_ast2(erl_syntax:string(NewStr), erl_syntax:string(DefaultString),
#ast_info{translatable_strings = [NewStr]}, TreeWalker);
translated_ast(ValueToken, Context, TreeWalker) ->
{{Ast, Info}, TreeWalker1} = value_ast(ValueToken, true, Context, TreeWalker),
translated_ast2(Ast, Ast, Info, TreeWalker1).
translated_ast2(NewStrAst, DefaultStringAst, AstInfo, TreeWalker) ->
StringLookupAst = erl_syntax:application(
erl_syntax:atom(erlydtl_runtime),
erl_syntax:atom(translate),
[NewStrAst, erl_syntax:variable("TranslationFun"), DefaultStringAst]),
{{StringLookupAst, AstInfo}, TreeWalker}.
% Completely unnecessary in ErlyDTL (use {{ "{%" }} etc), but implemented for compatibility.
templatetag_ast('openblock', _Context, TreeWalker) ->
{{erl_syntax:string("{%"), #ast_info{}}, TreeWalker};
templatetag_ast('closeblock', _Context, TreeWalker) ->
{{erl_syntax:string("%}"), #ast_info{}}, TreeWalker};
templatetag_ast('openvariable', _Context, TreeWalker) ->
{{erl_syntax:string("{{"), #ast_info{}}, TreeWalker};
templatetag_ast('closevariable', _Context, TreeWalker) ->
{{erl_syntax:string("}}"), #ast_info{}}, TreeWalker};
templatetag_ast('openbrace', _Context, TreeWalker) ->
{{erl_syntax:string("{"), #ast_info{}}, TreeWalker};
templatetag_ast('closebrace', _Context, TreeWalker) ->
{{erl_syntax:string("}"), #ast_info{}}, TreeWalker};
templatetag_ast('opencomment', _Context, TreeWalker) ->
{{erl_syntax:string("{#"), #ast_info{}}, TreeWalker};
templatetag_ast('closecomment', _Context, TreeWalker) ->
{{erl_syntax:string("#}"), #ast_info{}}, TreeWalker}.
widthratio_ast(Numerator, Denominator, Scale, Context, TreeWalker) ->
{{NumAst, NumInfo}, TreeWalker1} = value_ast(Numerator, false, Context, TreeWalker),
{{DenAst, DenInfo}, TreeWalker2} = value_ast(Denominator, false, Context, TreeWalker1),
{{ScaleAst, ScaleInfo}, TreeWalker3} = value_ast(Scale, false, Context, TreeWalker2),
{{format_number_ast(erl_syntax:application(
erl_syntax:atom(erlydtl_runtime),
erl_syntax:atom(widthratio),
[NumAst, DenAst, ScaleAst])), merge_info(ScaleInfo, merge_info(NumInfo, DenInfo))},
TreeWalker3}.
string_ast(String, TreeWalker) ->
{{erl_syntax:string(String), #ast_info{}}, TreeWalker}. %% less verbose AST, better for development and debugging
% {{erl_syntax:binary([erl_syntax:binary_field(erl_syntax:integer(X)) || X <- String]), #ast_info{}}, TreeWalker}.
include_ast(File, ArgList, Scopes, Context, TreeWalker) ->
FilePath = full_path(File, Context#dtl_context.doc_root),
case parse(FilePath, Context) of
{ok, InclusionParseTree, CheckSum} ->
{NewScope, {ArgInfo, TreeWalker1}} = lists:mapfoldl(fun
({{identifier, _, LocalVarName}, Value}, {AstInfo1, TreeWalker1}) ->
{{Ast, Info}, TreeWalker2} = value_ast(Value, false, Context, TreeWalker1),
{{LocalVarName, Ast}, {merge_info(AstInfo1, Info), TreeWalker2}}
end, {#ast_info{}, TreeWalker}, ArgList),
{{BodyAst, BodyInfo}, TreeWalker2} = with_dependency({FilePath, CheckSum},
body_ast(InclusionParseTree, Context#dtl_context{
parse_trail = [FilePath | Context#dtl_context.parse_trail],
local_scopes = [NewScope|Scopes]
}, TreeWalker1)),
{{BodyAst, merge_info(BodyInfo, ArgInfo)}, TreeWalker2};
Err ->
throw(Err)
end.
% include at run-time
ssi_ast(FileName, Context, TreeWalker) ->
{{Ast, Info}, TreeWalker1} = value_ast(FileName, true, Context, TreeWalker),
{Mod, Fun} = Context#dtl_context.reader,
{{erl_syntax:application(
erl_syntax:atom(erlydtl_runtime),
erl_syntax:atom(read_file),
[erl_syntax:atom(Mod), erl_syntax:atom(Fun), erl_syntax:string(Context#dtl_context.doc_root), Ast]), Info}, TreeWalker1}.
filter_tag_ast(FilterList, Contents, Context, TreeWalker) ->
{{InnerAst, Info}, TreeWalker1} = body_ast(Contents, Context#dtl_context{auto_escape = did}, TreeWalker),
{{FilteredAst, FilteredInfo}, TreeWalker2} = lists:foldl(fun
([{identifier, _, 'escape'}], {{AstAcc, InfoAcc}, TreeWalkerAcc}) ->
{{AstAcc, InfoAcc}, TreeWalkerAcc#treewalker{safe = true}};
([{identifier, _, 'safe'}], {{AstAcc, InfoAcc}, TreeWalkerAcc}) ->
{{AstAcc, InfoAcc}, TreeWalkerAcc#treewalker{safe = true}};
([{identifier, _, 'safeseq'}], {{AstAcc, InfoAcc}, TreeWalkerAcc}) ->
{{AstAcc, InfoAcc}, TreeWalkerAcc#treewalker{safe = true}};
(Filter, {{AstAcc, InfoAcc}, TreeWalkerAcc}) ->
{Ast, AstInfo} = filter_ast1(Filter, AstAcc, Context),
{{Ast, merge_info(InfoAcc, AstInfo)}, TreeWalkerAcc}
end, {{erl_syntax:application(
erl_syntax:atom(lists),
erl_syntax:atom(flatten),
[InnerAst]), Info}, TreeWalker1}, FilterList),
EscapedAst = case search_for_escape_filter(lists:reverse(FilterList), Context) of
on ->
erl_syntax:application(
erl_syntax:atom(erlydtl_filters),
erl_syntax:atom(force_escape),
[FilteredAst]);
_ ->
FilteredAst
end,
{{EscapedAst, FilteredInfo}, TreeWalker2}.
search_for_escape_filter(FilterList, #dtl_context{auto_escape = on}) ->
search_for_safe_filter(FilterList);
search_for_escape_filter(_, #dtl_context{auto_escape = did}) ->
off;
search_for_escape_filter([[{identifier, _, 'escape'}]|Rest], _Context) ->
search_for_safe_filter(Rest);
search_for_escape_filter([_|Rest], Context) ->
search_for_escape_filter(Rest, Context);
search_for_escape_filter([], _Context) ->
off.
search_for_safe_filter([[{identifier, _, 'safe'}]|_]) ->
off;
search_for_safe_filter([[{identifier, _, 'safeseq'}]|_]) ->
off;
search_for_safe_filter([_|Rest]) ->
search_for_safe_filter(Rest);
search_for_safe_filter([]) ->
on.
filter_ast(Variable, Filter, Context, TreeWalker) ->
% the escape filter is special; it is always applied last, so we have to go digging for it
% AutoEscape = 'did' means we (will have) decided whether to escape the current variable,
% so don't do any more escaping
{{UnescapedAst, Info}, TreeWalker2} = filter_ast_noescape(Variable, Filter,
Context#dtl_context{auto_escape = did}, TreeWalker),
EscapedAst = case search_for_escape_filter(Variable, Filter, Context) of
on ->
erl_syntax:application(
erl_syntax:atom(erlydtl_filters),
erl_syntax:atom(force_escape),
[UnescapedAst]);
_ ->
UnescapedAst
end,
{{EscapedAst, Info}, TreeWalker2}.
filter_ast_noescape(Variable, [{identifier, _, 'escape'}], Context, TreeWalker) ->
value_ast(Variable, true, Context, TreeWalker#treewalker{safe = true});
filter_ast_noescape(Variable, [{identifier, _, 'safe'}], Context, TreeWalker) ->
value_ast(Variable, true, Context, TreeWalker#treewalker{safe = true});
filter_ast_noescape(Variable, [{identifier, _, 'safeseq'}], Context, TreeWalker) ->
value_ast(Variable, true, Context, TreeWalker#treewalker{safe = true});
filter_ast_noescape(Variable, Filter, Context, TreeWalker) ->
{{VariableAst, Info1}, TreeWalker2} = value_ast(Variable, true, Context, TreeWalker),
{VarValue, Info2} = filter_ast1(Filter, VariableAst, Context),
{{VarValue, merge_info(Info1, Info2)}, TreeWalker2}.
filter_ast1([{identifier, _, Name}, {string_literal, _, ArgName}], VariableAst, _Context) ->
filter_ast2(Name, VariableAst, [erl_syntax:string(unescape_string_literal(ArgName))], []);
filter_ast1([{identifier, _, Name}, {number_literal, _, ArgName}], VariableAst, _Context) ->
filter_ast2(Name, VariableAst, [erl_syntax:integer(list_to_integer(ArgName))], []);
filter_ast1([{identifier, _, Name}, ArgVariable], VariableAst, Context) ->
{ArgAst, ArgVarName} = resolve_variable_ast(ArgVariable, Context),
filter_ast2(Name, VariableAst, [ArgAst], [ArgVarName]);
filter_ast1([{identifier, _, Name}], VariableAst, _Context) ->
filter_ast2(Name, VariableAst, [], []).
filter_ast2(Name, VariableAst, AdditionalArgs, VarNames) ->
{erl_syntax:application(erl_syntax:atom(erlydtl_filters), erl_syntax:atom(Name),
[VariableAst | AdditionalArgs]), #ast_info{var_names = VarNames}}.
search_for_escape_filter(Variable, Filter, #dtl_context{auto_escape = on}) ->
search_for_safe_filter(Variable, Filter);
search_for_escape_filter(_, _, #dtl_context{auto_escape = did}) ->
off;
search_for_escape_filter(Variable, [{identifier, _, 'escape'}] = Filter, _Context) ->
search_for_safe_filter(Variable, Filter);
search_for_escape_filter({apply_filter, Variable, Filter}, _, Context) ->
search_for_escape_filter(Variable, Filter, Context);
search_for_escape_filter(_Variable, _Filter, _Context) ->
off.
search_for_safe_filter(_, [{identifier, _, 'safe'}]) ->
off;
search_for_safe_filter(_, [{identifier, _, 'safeseq'}]) ->
off;
search_for_safe_filter({apply_filter, Variable, Filter}, _) ->
search_for_safe_filter(Variable, Filter);
search_for_safe_filter(_Variable, _Filter) ->
on.
resolve_variable_ast(VarTuple, Context) ->
resolve_variable_ast(VarTuple, Context, 'find_value').
resolve_variable_ast({attribute, {{identifier, _, AttrName}, Variable}}, Context, FinderFunction) ->
{VarAst, VarName} = resolve_variable_ast(Variable, Context, FinderFunction),
{erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(FinderFunction),
[erl_syntax:atom(AttrName), VarAst]), VarName};
resolve_variable_ast({variable, {identifier, _, VarName}}, Context, FinderFunction) ->
VarValue = case resolve_scoped_variable_ast(VarName, Context) of
undefined ->
erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(FinderFunction),
[erl_syntax:atom(VarName), erl_syntax:variable("Variables")]);
Val ->
Val
end,
{VarValue, VarName};
resolve_variable_ast(What, _Context, _FinderFunction) ->
error_logger:error_msg("~p:resolve_variable_ast unhandled: ~p~n", [?MODULE, What]).
resolve_scoped_variable_ast(VarName, Context) ->
lists:foldl(fun(Scope, Value) ->
case Value of
undefined -> proplists:get_value(VarName, Scope);
_ -> Value
end
end, undefined, Context#dtl_context.local_scopes).
format(Ast, Context, TreeWalker) ->
auto_escape(format_number_ast(Ast), Context, TreeWalker).
format_number_ast(Ast) ->
erl_syntax:application(erl_syntax:atom(erlydtl_filters), erl_syntax:atom(format_number),
[Ast]).
auto_escape(Value, _, #treewalker{safe = true}) ->
Value;
auto_escape(Value, #dtl_context{auto_escape = on}, _) ->
erl_syntax:application(erl_syntax:atom(erlydtl_filters), erl_syntax:atom(force_escape), [Value]);
auto_escape(Value, _, _) ->
Value.
firstof_ast(Vars, Context, TreeWalker) ->
body_ast([lists:foldr(fun
({L, _, _}=Var, []) when L=:=string_literal;L=:=number_literal ->
Var;
({L, _, _}, _) when L=:=string_literal;L=:=number_literal ->
erlang:error(errbadliteral);
(Var, []) ->
{'ifelse', Var, [Var], []};
(Var, Acc) ->
{'ifelse', Var, [Var], [Acc]} end,
[], Vars)], Context, TreeWalker).
ifelse_ast(Expression, {IfContentsAst, IfContentsInfo}, {ElseContentsAst, ElseContentsInfo}, Context, TreeWalker) ->
Info = merge_info(IfContentsInfo, ElseContentsInfo),
{{Ast, ExpressionInfo}, TreeWalker1} = value_ast(Expression, false, Context, TreeWalker),
{{erl_syntax:case_expr(erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(is_true), [Ast]),
[erl_syntax:clause([erl_syntax:atom(true)], none,
[IfContentsAst]),
erl_syntax:clause([erl_syntax:underscore()], none,
[ElseContentsAst])
]), merge_info(ExpressionInfo, Info)}, TreeWalker1}.
with_ast(ArgList, Contents, Context, TreeWalker) ->
{ArgAstList, {ArgInfo, TreeWalker1}} = lists:mapfoldl(fun
({{identifier, _, _LocalVarName}, Value}, {AstInfo1, TreeWalker1}) ->
{{Ast, Info}, TreeWalker2} = value_ast(Value, false, Context, TreeWalker1),
{Ast, {merge_info(AstInfo1, Info), TreeWalker2}}
end, {#ast_info{}, TreeWalker}, ArgList),
NewScope = lists:map(fun({{identifier, _, LocalVarName}, _Value}) ->
{LocalVarName, erl_syntax:variable(lists:concat(["Var_", LocalVarName]))}
end, ArgList),
{{InnerAst, InnerInfo}, TreeWalker2} = body_ast(Contents,
Context#dtl_context{local_scopes = [NewScope|Context#dtl_context.local_scopes]}, TreeWalker1),
{{erl_syntax:application(
erl_syntax:fun_expr([
erl_syntax:clause(lists:map(fun({_, Var}) -> Var end, NewScope), none,
[InnerAst])]), ArgAstList), merge_info(ArgInfo, InnerInfo)}, TreeWalker2}.
for_loop_ast(IteratorList, LoopValue, Contents, {EmptyContentsAst, EmptyContentsInfo}, Context, TreeWalker) ->
Vars = lists:map(fun({identifier, _, Iterator}) ->
erl_syntax:variable(lists:concat(["Var_", Iterator]))
end, IteratorList),
{{InnerAst, Info}, TreeWalker1} = body_ast(Contents,
Context#dtl_context{local_scopes = [
[{'forloop', erl_syntax:variable("Counters")} | lists:map(
fun({identifier, _, Iterator}) ->
{Iterator, erl_syntax:variable(lists:concat(["Var_", Iterator]))}
end, IteratorList)] | Context#dtl_context.local_scopes]}, TreeWalker),
CounterAst = erl_syntax:application(erl_syntax:atom(erlydtl_runtime),
erl_syntax:atom(increment_counter_stats), [erl_syntax:variable("Counters")]),
{{LoopValueAst, LoopValueInfo}, TreeWalker2} = value_ast(LoopValue, false, Context, TreeWalker1),
CounterVars0 = case resolve_scoped_variable_ast('forloop', Context) of
undefined ->
erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(init_counter_stats), [LoopValueAst]);
Value ->
erl_syntax:application(erl_syntax:atom(erlydtl_runtime), erl_syntax:atom(init_counter_stats), [LoopValueAst, Value])
end,
{{erl_syntax:case_expr(
erl_syntax:application(
erl_syntax:atom('lists'), erl_syntax:atom('mapfoldl'),
[erl_syntax:fun_expr([
erl_syntax:clause([erl_syntax:tuple(Vars), erl_syntax:variable("Counters")], none,
[erl_syntax:tuple([InnerAst, CounterAst])]),
erl_syntax:clause(case Vars of [H] -> [H, erl_syntax:variable("Counters")];
_ -> [erl_syntax:list(Vars), erl_syntax:variable("Counters")] end, none,
[erl_syntax:tuple([InnerAst, CounterAst])])
]),
CounterVars0, LoopValueAst]),
[erl_syntax:clause(
[erl_syntax:tuple([erl_syntax:underscore(),
erl_syntax:list([erl_syntax:tuple([erl_syntax:atom(counter), erl_syntax:integer(1)])],