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-rw-r--r--lib/syntax_tools/src/merl_tests.erl15
-rw-r--r--lib/syntax_tools/src/merl_transform.erl13
-rw-r--r--lib/syntax_tools/test/merl_SUITE.erl21
3 files changed, 43 insertions, 6 deletions
diff --git a/lib/syntax_tools/src/merl_tests.erl b/lib/syntax_tools/src/merl_tests.erl
index c1aae3100e..27db594050 100644
--- a/lib/syntax_tools/src/merl_tests.erl
+++ b/lib/syntax_tools/src/merl_tests.erl
@@ -48,6 +48,21 @@ parse_error_test_() ->
f(merl:quote("{")))
].
+transform_parse_error_test_() ->
+ [?_assertEqual("merl:quote(\"{\")",
+ f(merl_transform:parse_transform(
+ [?Q("merl:quote(\"{\")")], []))),
+ ?_assertEqual("merl:quote(2, \"{\")",
+ f(merl_transform:parse_transform(
+ [?Q("merl:quote(2, \"{\")")], []))),
+ ?_assertEqual("merl:qquote(\"{\", [{var, V}])",
+ f(merl_transform:parse_transform(
+ [?Q("merl:qquote(\"{\", [{var, V}])")], []))),
+ ?_assertEqual("merl:qquote(2, \"{\", [{var, V}])",
+ f(merl_transform:parse_transform(
+ [?Q("merl:qquote(2, \"{\", [{var, V}])")], [])))
+ ].
+
term_test_() ->
[?_assertEqual(tuple, erl_syntax:type(merl:term({}))),
?_assertEqual("{foo, 42}", f(merl:term({foo, 42})))
diff --git a/lib/syntax_tools/src/merl_transform.erl b/lib/syntax_tools/src/merl_transform.erl
index fe58b6a122..497baddd0a 100644
--- a/lib/syntax_tools/src/merl_transform.erl
+++ b/lib/syntax_tools/src/merl_transform.erl
@@ -104,10 +104,15 @@ 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;
diff --git a/lib/syntax_tools/test/merl_SUITE.erl b/lib/syntax_tools/test/merl_SUITE.erl
index 945972d405..52bbd9b3b8 100644
--- a/lib/syntax_tools/test/merl_SUITE.erl
+++ b/lib/syntax_tools/test/merl_SUITE.erl
@@ -29,12 +29,14 @@
init_per_group/2,end_per_group/2]).
%% Test cases
--export([merl_smoke_test/1]).
+-export([merl_smoke_test/1,
+ transform_parse_error_test/1]).
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
- [merl_smoke_test].
+ [merl_smoke_test,
+ transform_parse_error_test].
groups() ->
[].
@@ -84,6 +86,21 @@ merl_smoke_test(Config) when is_list(Config) ->
end)),
ok.
+transform_parse_error_test(_Config) ->
+ ?assertEqual("merl:quote(\"{\")",
+ f(merl_transform:parse_transform(
+ [?Q("merl:quote(\"{\")")], []))),
+ ?assertEqual("merl:quote(2, \"{\")",
+ f(merl_transform:parse_transform(
+ [?Q("merl:quote(2, \"{\")")], []))),
+ ?assertEqual("merl:qquote(\"{\", [{var, V}])",
+ f(merl_transform:parse_transform(
+ [?Q("merl:qquote(\"{\", [{var, V}])")], []))),
+ ?assertEqual("merl:qquote(2, \"{\", [{var, V}])",
+ f(merl_transform:parse_transform(
+ [?Q("merl:qquote(2, \"{\", [{var, V}])")], []))),
+ ok.
+
%% utilities
f(Ts) when is_list(Ts) ->