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Check field-num uniqueness #80

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Check field-num uniqueness #80

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20 changes: 18 additions & 2 deletions parser/grammar.peg
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Original file line number Diff line number Diff line change
Expand Up @@ -177,15 +177,31 @@ StructLike ← name:Identifier __ '{' __ fields:FieldList '}' EOS {
FieldList ← fields:(Field __)* {
fs := fields.([]interface{})
flds := make([]*Field, len(fs))
ids := make(map[int]bool, len(fs))
for i, f := range fs {
flds[i] = f.([]interface{})[0].(*Field)

if ids[flds[i].ID] {
return nil, fmt.Errorf("multiple fields with the same identifier: %d", flds[i].ID)
}

ids[flds[i].ID] = true
}
return flds, nil
}

Field ← id:IntConstant _ ':' _ req:FieldReq? _ typ:FieldType _ name:Identifier __ def:('=' _ ConstValue)? ListSeparator? {
FieldID ← id:IntConstant _ ':' {
return int(id.(int64)), nil
}

Field ← id:FieldID? _ req:FieldReq? _ typ:FieldType _ name:Identifier __ def:('=' _ ConstValue)? ListSeparator? {
parsedID := -1
if id != nil {
parsedID = id.(int)
}

f := &Field{
ID : int(id.(int64)),
ID : parsedID,
Name : string(name.(Identifier)),
Type : typ.(*Type),
}
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