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Enwikipedia>Mr. Stradivarius (seperate treatment of private fields and read-only fields, and add a __pairs metamethod) |
Enwikipedia>Mr. Stradivarius (reduce redundant error code) |
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for field in pairs(data) do |
for field in pairs(data) do |
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readOnlyFields[field] = true |
readOnlyFields[field] = true |
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end |
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local function restrictedFieldError(key, restriction) |
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restriction |
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end |
end |
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__index = function (t, key) |
__index = function (t, key) |
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if privateFields[key] then |
if privateFields[key] then |
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restrictedFieldError(key, 'private') |
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else |
else |
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return data[key] |
return data[key] |
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__newindex = function (t, key, value) |
__newindex = function (t, key, value) |
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if privateFields[key] then |
if privateFields[key] then |
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restrictedFieldError(key, 'private') |
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error(string.format( |
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"image object field '%s' is private", |
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tostring(key) |
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), 2) |
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elseif readOnlyFields[key] then |
elseif readOnlyFields[key] then |
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restrictedFieldError(key, 'read-only') |
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error(string.format( |
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"image object field '%s' is read-only", |
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tostring(key) |
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), 2) |
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else |
else |
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data[key] = value |
data[key] = value |
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