[nacltoons] Add Makefile for building lua bindings.

nacltoons/bindings/basic.lua

+--- Helper script for generating bindings with tolua++
+-- This file is based on the file of the same name which ships
+-- as part of cocos2dx.
+-- example usage:
+-- tolua++ -L basic.lua -o LuaCocos2d.cpp Cocos2d.pkg
+
+_is_functions = _is_functions or {}
+_to_functions = _to_functions or {}
+_push_functions = _push_functions or {}
+
+local CCObjectTypes = {
+    "CCPhysicsSprite",
+}
+
+-- register CCObject types
+for i = 1, #CCObjectTypes do
+    _push_functions[CCObjectTypes[i]] = "toluafix_pushusertype_ccobject"
+end
+
+-- register LUA_FUNCTION, LUA_TABLE, LUA_HANDLE type
+_to_functions["LUA_FUNCTION"] = "toluafix_ref_function"
+_is_functions["LUA_FUNCTION"] = "toluafix_isfunction"
+_to_functions["LUA_TABLE"] = "toluafix_totable"
+_is_functions["LUA_TABLE"] = "toluafix_istable"
+
+local toWrite = {}
+local currentString = ''
+local out
+local WRITE, OUTPUT = write, output

[noelallen1, 2013/03/08 21:52:01]

What are these circular definitions?

[Sam Clegg, 2013/03/08 22:22:53]

What this code is doing is intercepting/overwriting
the global write() and output() symbols.

The wrapper version of write buffers all the lines
so that they can be processed in post_output_hook.

This line is making copies of the original write and output
function before they are overridden.

+
+function output(s)
+    out = _OUTPUT
+    output = OUTPUT -- restore
+    output(s)
+end
+
+function write(a)
+    if out == _OUTPUT then
+        currentString = currentString .. a
+        if string.sub(currentString,-1) == '\n'  then
+            toWrite[#toWrite+1] = currentString
+            currentString = ''
+        end
+    else
+        WRITE(a)

[noelallen1, 2013/03/08 21:52:01]

what is the difference between write and WRITE?

[Sam Clegg, 2013/03/08 22:22:53]

WRITE() is the original write() as defined by tolua.
This script has its own write global that overrides it.

+    end
+end
+
+function post_output_hook(package)
+    local result = table.concat(toWrite)
+    local function replace(pattern, replacement)
+        local k = 0
+        local nxt, currentString = 1, ''
+        repeat
+            local s, e = string.find(result, pattern, nxt, true)
+            if e then
+                currentString = currentString .. string.sub(result, nxt, s-1) .. replacement
+                nxt = e + 1
+                k = k + 1
+            end
+        until not e
+        result = currentString..string.sub(result, nxt)
+        if k == 0 then print('Pattern not replaced', pattern) end
+    end
+
+    replace([[#ifndef __cplusplus
+#include "stdlib.h"
+#endif
+]],
+      [[// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+#ifndef __cplusplus
+#include "stdlib.h"
+#endif
+]])
+
+    if string.find(result, 'toluafix_pushusertype_ccobject') then
+        replace([[toluafix_pushusertype_ccobject(tolua_S,(void*)tolua_ret]],
+                [[int nID = (tolua_ret) ? (int)tolua_ret->m_uID : -1;
+    int* pLuaID = (tolua_ret) ? &tolua_ret->m_nLuaID : NULL;
+    toluafix_pushusertype_ccobject(tolua_S, nID, pLuaID, (void*)tolua_ret]])
+    end
+
+    WRITE(result)
+end