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authorBjörn-Egil Dahlberg <[email protected]>2014-08-18 18:32:54 +0200
committerBjörn-Egil Dahlberg <[email protected]>2014-08-22 18:12:29 +0200
commitef6d25edd8e7975d20d5ac68ef89524743a245ea (patch)
treed81cc0a4194ef2474f6878abb931f968e1404ff6 /lib/compiler/src
parentdb2f7bc3392196509a3c5a9e19f78f8bf6b30e2c (diff)
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compiler: Normalize unary ops on Maps key literals
Unary ops are normalized before core transformation, i.e. handle negative integers as map keys. Strictly speaking, map keys are expressions but by handling them as patterns we can normalize negative integers.
Diffstat (limited to 'lib/compiler/src')
-rw-r--r--lib/compiler/src/sys_pre_expand.erl11
1 files changed, 10 insertions, 1 deletions
diff --git a/lib/compiler/src/sys_pre_expand.erl b/lib/compiler/src/sys_pre_expand.erl
index 761ae8409c..b1e0bf51aa 100644
--- a/lib/compiler/src/sys_pre_expand.erl
+++ b/lib/compiler/src/sys_pre_expand.erl
@@ -232,9 +232,18 @@ pattern({map,Line,Ps}, St0) ->
{TPs,St1} = pattern_list(Ps, St0),
{{map,Line,TPs},St1};
pattern({map_field_exact,Line,K0,V0}, St0) ->
- {K,St1} = expr(K0, St0),
+ %% Key should be treated as an expression
+ %% but since expressions are not allowed yet,
+ %% process it through pattern .. and handle assoc
+ %% (normalise unary op integer -> integer)
+ {K,St1} = pattern(K0, St0),
{V,St2} = pattern(V0, St1),
{{map_field_exact,Line,K,V},St2};
+pattern({map_field_assoc,Line,K0,V0}, St0) ->
+ %% when keys are Maps
+ {K,St1} = pattern(K0, St0),
+ {V,St2} = pattern(V0, St1),
+ {{map_field_assoc,Line,K,V},St2};
%%pattern({struct,Line,Tag,Ps}, St0) ->
%% {TPs,TPsvs,St1} = pattern_list(Ps, St0),
%% {{tuple,Line,[{atom,Line,Tag}|TPs]},TPsvs,St1};