diff options
Diffstat (limited to 'lib/syntax_tools/src/merl_transform.erl')
| -rw-r--r-- | lib/syntax_tools/src/merl_transform.erl | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/lib/syntax_tools/src/merl_transform.erl b/lib/syntax_tools/src/merl_transform.erl index 66b06c8137..b298bc407f 100644 --- a/lib/syntax_tools/src/merl_transform.erl +++ b/lib/syntax_tools/src/merl_transform.erl @@ -9,6 +9,16 @@ %% See the License for the specific language governing permissions and %% limitations under the License. %% +%% Alternatively, you may use this file under the terms of the GNU Lesser +%% General Public License (the "LGPL") as published by the Free Software +%% Foundation; either version 2.1, or (at your option) any later version. +%% If you wish to allow use of your version of this file only under the +%% terms of the LGPL, you should delete the provisions above and replace +%% them with the notice and other provisions required by the LGPL; see +%% <http://www.gnu.org/licenses/>. If you do not delete the provisions +%% above, a recipient may use your version of this file under the terms of +%% either the Apache License or the LGPL. +%% %% @author Richard Carlsson <[email protected]> %% @copyright 2012-2015 Richard Carlsson %% @doc Parse transform for merl. Enables the use of automatic metavariables @@ -68,8 +78,7 @@ case_guard([{expr,_}, {text,Text}]) -> erl_syntax:is_literal(Text). case_body([{expr,Expr}, {text,_Text}], T) -> - pre_expand_case(Expr, erl_syntax:case_expr_clauses(T), - erl_syntax:get_pos(T)). + pre_expand_case(Expr, erl_syntax:case_expr_clauses(T), get_location(T)). post(T) -> merl:switch( @@ -79,7 +88,7 @@ post(T) -> lists:all(fun erl_syntax:is_literal/1, [F|As]) end, fun ([{args, As}, {function, F}]) -> - Line = erl_syntax:get_pos(F), + Line = get_location(F), [F1|As1] = lists:map(fun erl_syntax:concrete/1, [F|As]), eval_call(Line, F1, As1, T) end}, @@ -105,10 +114,15 @@ expand_qquote([Text, Env], T, Line) -> case erl_syntax:is_literal(Text) of true -> As = [Line, erl_syntax:concrete(Text)], - %% expand further if possible - expand(merl:qquote(Line, "merl:subst(_@tree, _@env)", - [{tree, eval_call(Line, quote, As, T)}, - {env, Env}])); + case eval_call(Line, quote, As, failed) of + failed -> + T; + T1 -> + %% expand further if possible + expand(merl:qquote(Line, "merl:subst(_@tree, _@env)", + [{tree, T1}, + {env, Env}])) + end; false -> T end; @@ -118,7 +132,7 @@ expand_qquote(_As, T, _StartPos) -> expand_template(F, [Pattern | Args], T) -> case erl_syntax:is_literal(Pattern) of true -> - Line = erl_syntax:get_pos(Pattern), + Line = get_location(Pattern), As = [erl_syntax:concrete(Pattern)], merl:qquote(Line, "merl:_@function(_@pattern, _@args)", [{function, F}, @@ -260,3 +274,12 @@ is_erlang_var([C|_]) when C >= $A, C =< $Z ; C >= $À, C =< $Þ, C /= $× -> true; is_erlang_var(_) -> false. + +get_location(T) -> + Pos = erl_syntax:get_pos(T), + case erl_anno:is_anno(Pos) of + true -> + erl_anno:location(Pos); + false -> + Pos + end. |