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Merge pull request #3 from peterbell10/ScopedEnums
Add support for typed and scoped enums
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| -- Based on the enumeration class by Waldemar Celes found in enumerate.lua | ||
| -- Following is the original notice from that file. | ||
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| -- This code is free software; you can redistribute it and/or modify it. | ||
| -- The software provided hereunder is on an "as is" basis, and | ||
| -- the author has no obligation to provide maintenance, support, updates, | ||
| -- enhancements, or modifications. | ||
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| -- ScopedEnum class | ||
| -- Represents enumeration | ||
| -- The following fields are stored: | ||
| -- {i} = list of constant names | ||
| classScopedEnum = { | ||
| } | ||
| classScopedEnum.__index = classScopedEnum | ||
| setmetatable(classScopedEnum,classFeature) | ||
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| -- register scopedenum | ||
| function classScopedEnum:register (pre) | ||
| if not self:check_public_access() then | ||
| return | ||
| end | ||
| pre = pre or '' | ||
| local nspace = getnamespace(classContainer.curr) | ||
| local i=1 | ||
| output(pre..'tolua_module(tolua_S,"'..self.name..'",0);') | ||
| output(pre..'tolua_beginmodule(tolua_S,"'..self.name..'");') | ||
| while self[i] do | ||
| if self.lnames[i] and self.lnames[i] ~= "" then | ||
| output(pre..' tolua_constant(tolua_S,"'..self.lnames[i]..'",static_cast<lua_Number>('..nspace..self.name.."::"..self[i]..'));') | ||
| end | ||
| i = i+1 | ||
| end | ||
| output(pre..'tolua_endmodule(tolua_S);') | ||
| end | ||
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| -- Print method | ||
| function classScopedEnum:print (ident,close) | ||
| print(ident.."ScopedEnum{") | ||
| print(ident.." name = "..self.name) | ||
| local i=1 | ||
| while self[i] do | ||
| print(ident.." '"..self[i].."'("..self.lnames[i].."),") | ||
| i = i+1 | ||
| end | ||
| print(ident.."}"..close) | ||
| end | ||
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| function emitenumprototype(type) | ||
| output("int tolua_is" .. string.gsub(type,"::","_") .. " (lua_State* L, int lo, int def, tolua_Error* err);") | ||
| end | ||
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| _global_output_enums = {} | ||
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| -- write support code | ||
| function classScopedEnum:supcode () | ||
| if _global_output_enums[self.name] == nil then | ||
| _global_output_enums[self.name] = 1 | ||
| output("int tolua_is" .. string.gsub(self.name,"::","_") .. " (lua_State* L, int lo, int def, tolua_Error* err)") | ||
| output("{") | ||
| output("\tif (!tolua_isnumber(L,lo,def,err)) return 0;") | ||
| output("\tlua_Number val = tolua_tonumber(L,lo,def);") | ||
| output("\tif (val >= " .. self.min .. ".0 && val <= " ..self.max .. ".0) return 1;") | ||
| output("\terr->index = lo;") | ||
| output("\terr->array = 0;") | ||
| output("\terr->type = \"" .. self.name .. "\";") | ||
| output("\treturn 0;") | ||
| output("}") | ||
| end | ||
| end | ||
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| -- Internal constructor | ||
| function _ScopedEnum (t,varname) | ||
| setmetatable(t,classScopedEnum) | ||
| append(t) | ||
| appendenum(t) | ||
| local parent = classContainer.curr | ||
| if parent then | ||
| t.access = parent.curr_member_access | ||
| t.global_access = t:check_public_access() | ||
| end | ||
| return t | ||
| end | ||
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| -- Constructor | ||
| -- Expects a string representing the enumerate body | ||
| function ScopedEnum (n,b,varname,typed) | ||
| b = string.gsub(b, ",[%s\n]*}", "\n}") -- eliminate last ',' | ||
| local t = split(strsub(b,2,-2),',') -- eliminate braces | ||
| local i = 1 | ||
| local e = {n=0} | ||
| local value = 0 | ||
| local min = 0 | ||
| local max = 0 | ||
| while t[i] do | ||
| local tt = split(t[i],'=') -- discard initial value | ||
| e.n = e.n + 1 | ||
| e[e.n] = tt[1] | ||
| tt[2] = tonumber(tt[2]) | ||
| if tt[2] == nil then | ||
| tt[2] = value | ||
| end | ||
| value = tt[2] + 1 -- advance the selected value | ||
| if tt[2] > max then | ||
| max = tt[2] | ||
| end | ||
| if tt[2] < min then | ||
| min = tt[2] | ||
| end | ||
| i = i+1 | ||
| end | ||
| -- set lua names | ||
| i = 1 | ||
| e.lnames = {} | ||
| local ns = getcurrnamespace() | ||
| while e[i] do | ||
| local t = split(e[i],'@') | ||
| e[i] = t[1] | ||
| if not t[2] then | ||
| t[2] = applyrenaming(t[1]) | ||
| end | ||
| e.lnames[i] = t[2] or t[1] | ||
| local fullname = ns.."::"..n.."::"..e[i] | ||
| _global_enums[ fullname ] = (fullname) | ||
| i = i+1 | ||
| end | ||
| e.name = n | ||
| e.min = min | ||
| e.max = max | ||
| if n ~= "" then | ||
| _enums[n] = true | ||
| if typed and typed ~= "" then | ||
| Typedef(typed.." "..n) | ||
| else | ||
| Typedef("int "..n) | ||
| end | ||
| end | ||
| return _ScopedEnum(e, varname) | ||
| end | ||
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