116 lines
4.3 KiB
Plaintext
116 lines
4.3 KiB
Plaintext
#!/usr/bin/env nomsu -V4.10.12.7
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#
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This file contains the implementation of an Object-Oriented programming system.
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%globals.METAMETHOD_MAP = {..}
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"as text": "__tostring", "clean up": "__gc", "+ 1": "__add", "- 1": "__sub"
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"* 1": "__mul", "/ 1": "__div", "-": "__unm", "// 1": "__idiv", "mod 1": "__mod"
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"^ 1": "__pow", "& 1": "__band", "| 1": "__bor", "~ 1": "__bxor", "~": "__bnot"
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"<< 1": "__bshl", ">> 1": "__bshr", "== 1": "__eq", "< 1": "__lt", "<= 1": "__le"
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"set 1 = 2": "__newindex", size: "__len", iterate: "__ipairs"
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"iterate all": "__pairs"
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test:
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object (Dog):
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(Dog).genus = "Canus"
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my action [set up]:
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%me.barks or= 0
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my action [bark, woof]:
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%barks = [: for % in 1 to %me.barks: add "Bark!"]
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return (%barks::joined with " ")
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my action [get pissed off]: %me.barks += 1
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%d = (Dog {barks: 2})
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assume (type of %d) == "Dog"
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assume (%d is a "Dog")
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assume %d.barks == 2
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assume ((%d::bark) == "Bark! Bark!")
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assume ((%d::woof) == "Bark! Bark!")
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%d::get pissed off
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assume (%d.barks == 3)
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assume ((%d::bark) == "Bark! Bark! Bark!")
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assume (%d.genus == "Canus")
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assume ("\(%d.class)" == "Dog")
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assume (%d.genus == "Canus")
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assume (%d.barks == 3)
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%d2 = (Dog {})
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assume (%d2.barks == 0) or barf "Default initializer failed"
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with {%d: Dog {barks: 1}}:
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assume ((%d::bark) == "Bark!")
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object (Corgi) extends (Dog):
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my action [sploot] "splooted"
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my action [bark, woof]:
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%barks = [: for % in 1 to %me.barks: add "Yip!"]
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return (%barks::joined with " ")
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%corg = (Corgi {})
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assume (%corg.barks == 0)
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with {%d: Corgi {barks: 1}}:
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assume ((%d::sploot) == "splooted") or barf "subclass method failed"
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assume ((%d::bark) == "Yip!") or barf "inheritance failed"
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assume ((%d::woof) == "Yip!")
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with {%d: Dog {barks: 2}}:
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assume ((%d::bark) == "Bark! Bark!")
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(my action %actions %body) compiles to:
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lua> "\
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..local fn_name = \%actions[1].stub:as_lua_id()
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local \%args = List(\%actions[1]:get_args())
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table.insert(\%args, 1, \(\%me))
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local lua = LuaCode("class.", fn_name, " = ", \(what (%args -> %body) compiles to))
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for i=2,#\%actions do
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local alias = \%actions[i]
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local alias_name = alias.stub:as_lua_id()
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local \%alias_args = List(alias:get_args())
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table.insert(\%alias_args, 1, \(\%me))
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lua:append("\\nclass.", alias_name, " = ")
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if \%args == \%alias_args then
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lua:append("class.", fn_name)
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else
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lua:append(\(what (%alias_args -> %actions.1) compiles to))
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end
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end
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return lua"
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(object %classname extends %parent %class_body) compiles to:
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unless (%classname.type == "Action"):
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compile error at %classname "\
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..Expected this to be an action, not a \%classname.type"
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for % in %classname:
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unless (% is text):
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compile error at % "Class names should not have arguments."
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return (..)
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Lua "\
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..do
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local class = {name=\(quote %classname.stub)}
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class.__type = class.name
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setmetatable(class, {
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__index=\(%parent as lua expr),
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__tostring=function(cls) return cls.name end,
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__call=function(cls, inst)
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if inst == nil then return cls end
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inst = setmetatable(inst, cls)
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if inst.set_up then inst:set_up() end
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return inst
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end,
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})
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_ENV[class.name:as_lua_id()] = class
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class.__index = class
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class.class = class
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class.__tostring = function(inst)
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return inst.name..getmetatable(Dict{}).__tostring(inst)
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end
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\(%class_body as lua)
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for stub,metamethod in pairs(globals.METAMETHOD_MAP) do
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class[metamethod] = class[stub:as_lua_id()]
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end
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end"
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(object %classname %class_body) parses as (..)
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object %classname extends (nil) %class_body
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