diff options
Diffstat (limited to 'util/generate-binding.lua')
| -rw-r--r-- | util/generate-binding.lua | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/util/generate-binding.lua b/util/generate-binding.lua index 23aa057..870cbb4 100644 --- a/util/generate-binding.lua +++ b/util/generate-binding.lua @@ -13,6 +13,7 @@ function ExtractFunctionType(signature) end +-- remove whitespace from the start and end of a string local function trimWhitespace(s) s = string.gsub(s, "^%s*", "") s = string.gsub(s, "%s+$", "") @@ -20,6 +21,7 @@ local function trimWhitespace(s) end +-- get array containing { type, name } tables for each argument in the signature function ExtractFunctionArgs(signature) local args = {} local argStr = string.match(signature, "%((.*)%)") @@ -40,6 +42,8 @@ function ExtractFunctionArgs(signature) end +-- determine what kind of pointer this type is +-- (not a pointer? ordinary pointer? double pointer? etc) function GetPointerLevel(ctype) local level = 0 for _ in string.gmatch(ctype, "%*") do @@ -49,6 +53,9 @@ function GetPointerLevel(ctype) end +-- convert a C type to a lua type +-- also includes "void" and "unknown" bc we need to know those +-- in some contexts function GetLuaType(ctype) -- double (triple, etc) pointers if GetPointerLevel(ctype) > 1 then return "unknown" @@ -74,6 +81,7 @@ function GetLuaType(ctype) end +-- create a lua aux lib call to fill the arg value from the lua stack function PullArg(arg, index) local ltype = GetLuaType(arg.type) @@ -88,6 +96,7 @@ function PullArg(arg, index) end +-- call the function and push the return value (if any) to the lua stack function Call(ftype, fname, args) local callArgs = "(" for index, arg in ipairs(args) do @@ -115,6 +124,10 @@ function Call(ftype, fname, args) end +-- generate a complete function definition to bind a C function +-- into lua +-- will deliberately generate code that doesn't compile if it's not +-- sure what to do so that you will *have* to come fix it function bind(signature) local ftype = ExtractFunctionType(signature) local fname = ExtractFunctionName(signature) |