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correctly handle empty lists #23

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correctly handle empty lists #23

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8 changes: 8 additions & 0 deletions src/ej.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,14 @@ get_value(Key, []) when is_binary(Key) ->
undefined;
get_value(Key, null) when is_binary(Key) ->
undefined;
get_value(first, []) ->
undefined;
get_value(last, []) ->
undefined;
get_value(Index, []) when is_integer(Index) ->
undefined;
get_value({select, _KeyValue}, []) ->
{from_select, []};
get_value(first, [H|_T]) ->
H;
get_value(last, List=[_H|_T]) ->
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7 changes: 6 additions & 1 deletion test/ej_alt_test.erl
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Expand Up @@ -24,6 +24,9 @@ ej_alt_test_() ->
?_assertEqual(4, ej:get({"widget", "values", 4}, Widget)),
?_assertEqual(1, ej:get({"widget", "values", first}, Widget)),
?_assertEqual(5, ej:get({"widget", "values", last}, Widget)),
?_assertEqual(undefined, ej:get({"widget", "keys", first}, Widget)),
?_assertEqual(undefined, ej:get({"widget", "keys", last}, Widget)),
?_assertEqual(undefined, ej:get({"widget", "keys", 2}, Widget)),
?_assertEqual({[{<<"id">>, 5}]},
ej:get({<<"objects">>, last}, ObjList)),
?_assertEqual({[{<<"id">>, 1}]},
Expand Down Expand Up @@ -65,7 +68,9 @@ ej_alt_test_() ->
ComplexBeginning = {{select, {"match", "me"}}},
?assertMatch([{_}, {_}], ej:get(ComplexBeginning, Data)),
ComplexBeginningDeeper = {{select, {"match", "me"}}, "match"},
?assertMatch([<<"me">>, <<"me">>], ej:get(ComplexBeginningDeeper, Data))
?assertMatch([<<"me">>, <<"me">>], ej:get(ComplexBeginningDeeper, Data)),
PathAgainstEmptyList = {"menu", "popup", "titleitem", {select, {"value", "Title"}}},
?assertMatch([], ej:get(PathAgainstEmptyList, Menu))
end},
{"ej:get with multi-level array matching",
fun() ->
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4 changes: 3 additions & 1 deletion test/menu.alt_terms
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Expand Up @@ -6,4 +6,6 @@
[{[{<<"value">>,<<"New">>},{<<"onclick">>,<<"CreateNewDoc()">>}]},
{[{<<"value">>,<<"Open">>},{<<"onclick">>,<<"OpenDoc()">>}]},
{[{<<"value">>,<<"Close">>},
{<<"onclick">>,<<"CloseDoc()">>}]}]}]}}]}}]}.
{<<"onclick">>,<<"CloseDoc()">>}]}]},
{<<"titleitem">>,
[]}]}}]}}]}.
3 changes: 2 additions & 1 deletion test/menu.json
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Expand Up @@ -6,7 +6,8 @@
{"value": "New", "onclick": "CreateNewDoc()"},
{"value": "Open", "onclick": "OpenDoc()"},
{"value": "Close", "onclick": "CloseDoc()"}
]
],
"titleitem": []
}
}}

4 changes: 3 additions & 1 deletion test/menu.terms
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Expand Up @@ -14,4 +14,6 @@
{<<"onclick">>,<<"OpenDoc()">>}]},
{struct,
[{<<"value">>,<<"Close">>},
{<<"onclick">>,<<"CloseDoc()">>}]}]}]}}]}}]}.
{<<"onclick">>,<<"CloseDoc()">>}]}]},
{<<"titleitem">>,
[]}]}}]}}]}.
1 change: 1 addition & 0 deletions test/widget.alt_terms
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@@ -1,6 +1,7 @@
{[{<<"widget">>,
{[{<<"version">>,<<"1">>},
{<<"values">>,[1,2,3,4,5]},
{<<"keys">>,[]},
{<<"debug">>,<<"on">>},
{<<"window">>,
{[{<<"title">>,<<"Sample Konfabulator Widget">>},
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1 change: 1 addition & 0 deletions test/widget.json
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@@ -1,6 +1,7 @@
{"widget": {
"version": "1",
"values": [1,2,3,4,5],
"keys": [],
"debug": "on",
"window": {
"title": "Sample Konfabulator Widget",
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1 change: 1 addition & 0 deletions test/widget.terms
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@@ -1,6 +1,7 @@
{struct,[{<<"widget">>,
{struct,[{<<"version">>,<<"1">>},
{<<"values">>,[1,2,3,4,5]},
{<<"keys">>,[]},
{<<"debug">>,<<"on">>},
{<<"window">>,
{struct,[{<<"title">>,<<"Sample Konfabulator Widget">>},
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