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101 lines
2.6 KiB
Ruby
101 lines
2.6 KiB
Ruby
# This module augments Fiddle with useful helpers.
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module LVGL
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end
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module LVGL::Fiddlier
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# Given a +type+, returns the value of the global +name+.
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def get_global!(type, name)
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addr = handler.sym(name)
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raise(Fiddle::DLError, "cannot find symbol #{name}") unless addr
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s = struct(["#{type} value"])
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s.new(addr).value
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end
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# Given a +type+, sets the global +name+ to +new_value+.
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def set_global!(type, name, new_value)
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addr = handler.sym(name)
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raise(Fiddle::DLError, "cannot find symbol #{name}") unless addr
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s = struct(["#{type} value"])
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tmp = s.new(addr)
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tmp.value = new_value
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tmp.value
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end
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def get_global_struct!(struct, name)
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addr = handler.sym(name)
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raise(Fiddle::DLError, "cannot find symbol for struct #{name}") unless addr
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struct.new(addr)
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end
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# Using +set_global!+ and +get_global!+, creates accessors for a global
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# variable.
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def global!(type, name)
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method_name = name.to_sym
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define_method(method_name) do
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get_global!(type, name)
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end
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module_function method_name
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method_name = "#{name}=".to_sym
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define_method(method_name) do |value|
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set_global!(type, name, value)
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end
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module_function method_name
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end
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# TODO: parse `typedef enum {...} name;`
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def enum!(name, values, type: "int")
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typedef name.to_s, type.to_s
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mod = self.const_set(name.to_sym, Module.new)
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current_value = 0
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values.each do |data|
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if data.is_a? Hash
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name = data.keys.first.to_sym
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current_value = data.values.first
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else
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name = data.to_sym
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end
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mod.const_set(name, current_value)
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current_value += 1
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end
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end
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# Flattens the given nested struct
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def flatten_struct!(fields, prefix: nil)
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fields.map do |field|
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type = field.first
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name = [prefix, field.last].compact.join("_")
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if type.is_a? Array then
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flatten_struct!(type, prefix: name)
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else
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[[type.to_sym, name.to_sym]]
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end
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end.flatten(1)
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end
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# Parses nested structs into a flattened Fiddle struct.
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# XXX: broken because of struct alignment padding / packing
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# -> http://www.catb.org/esr/structure-packing/#_padding
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def struct!(fields)
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flattened = flatten_struct!(fields).map do |field|
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type = field.first
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name = field.last
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"#{type} #{name}"
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end
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struct(flattened)
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end
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# Define the given +sym+ as a function.
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# It will auto-wrap the method using a closure.
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def bound_method!(sym, sig)
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sym = sym.to_sym
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module_function sym
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ctx = self
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@func_map[sym.to_s] = bind(sig) do |*args|
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ctx.send(sym, *args)
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end
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end
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end
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