New Lua examples - Mark Gossage patch #1295168

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@7471 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/lua/constants/Makefile

@@ -0,0 +1,19 @@
+TOP        = ../..
+SWIG       = $(TOP)/../swig
+CXXSRCS    = 
+TARGET     = example
+INTERFACE  = example.i
+LIBS       = 
+
+all::
+	$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' lua
+
+static::
+	$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	TARGET='mylua' INTERFACE='$(INTERFACE)' lua_static
+
+clean::
+	$(MAKE) -f $(TOP)/Makefile lua_clean
+
+check: all

Examples/lua/constants/example.i

@@ -0,0 +1,27 @@
+/* File : example.i */
+%module example
+
+/* A few preprocessor macros */
+
+#define    ICONST      42
+#define    FCONST      2.1828
+#define    CCONST      'x'
+#define    CCONST2     '\n'
+#define    SCONST      "Hello World"
+#define    SCONST2     "\"Hello World\""
+
+/* This should work just fine */
+#define    EXPR        ICONST + 3*(FCONST)
+
+/* This shouldn't do anything */
+#define    EXTERN      extern
+
+/* Neither should this (BAR isn't defined) */
+#define    FOO         (ICONST + BAR)
+
+/* The following directives also produce constants */
+
+%constant int iconst = 37;
+%constant double fconst = 3.14;
+
+

Examples/lua/constants/runme.lua

@@ -0,0 +1,35 @@
+-- file: example.lua
+
+---- importing ----
+if string.sub(_VERSION,1,7)=='Lua 5.0' then
+	-- lua5.0 doesnt have a nice way to do this
+	lib=loadlib('example.dll','Example_Init') or loadlib('example.so','Example_Init')
+	assert(lib)()
+else
+	-- lua 5.1 does
+	require('example')
+end
+
+print("ICONST  = "..example.ICONST.." (should be 42)")
+print("FCONST  = "..example.FCONST.." (should be 2.1828)")
+print("CCONST  = "..example.CCONST.." (should be 'x')")
+print("CCONST2 = "..example.CCONST2.." (this should be on a new line)")
+print("SCONST  = "..example.SCONST.." (should be 'Hello World')")
+print("SCONST2 = "..example.SCONST2.." (should be '\"Hello World\"')")
+print("EXPR    = "..example.EXPR.." (should be 48.5484)")
+print("iconst  = "..example.iconst.." (should be 37)")
+print("fconst  = "..example.fconst.." (should be 3.14)")
+
+-- helper to check that a fn failed
+function checkfail(fn)
+	if pcall(fn)==true then
+		print("that shouldn't happen, it worked")
+	else
+		print("function failed as expected")
+	end
+end
+
+-- these should fail
+-- example.EXTERN is a nil value, so concatentatin will make it fail
+checkfail(function() print("EXTERN = "..example.EXTERN) end)
+checkfail(function() print("FOO = "..example.FOO) end)

Examples/lua/functest/Makefile

@@ -0,0 +1,19 @@
+TOP        = ../..
+SWIG       = $(TOP)/../swig
+CXXSRCS    = example.c
+TARGET     = example
+INTERFACE  = example.i
+LIBS       = 
+
+all::
+	$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' lua
+
+static::
+	$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	TARGET='mylua' INTERFACE='$(INTERFACE)' lua_static
+
+clean::
+	$(MAKE) -f $(TOP)/Makefile lua_clean
+
+check: all

Examples/lua/functest/example.c

@@ -0,0 +1,25 @@
+/* File : example.c */
+
+/* A global variable */
+double Foo = 3.0;
+
+int add1(int x, int y)
+{
+   return x+y;
+}
+
+void add2(int x, int *y, int *z)
+{
+   *z = x+*y;
+}
+
+int add3(int x, int y, int *z)
+{
+   *z = x-y;
+   return x+y;
+}
+
+void add4(int x, int *y)
+{
+   *y += x;
+}

Examples/lua/functest/example.i

@@ -0,0 +1,11 @@
+/* File : example.i */
+%module example
+
+%include "typemaps.i" // you must have this for the typemaps for ptrs
+// basic function testing
+//
+extern int add1(int x, int y);              // return x+y -- basic function test
+extern void add2(int x, int *INPUT, int *OUTPUT); // *z = x+*y  -- argin and argout test
+extern int add3(int x, int y, int *OUTPUT);    // return x+y, *z=x-y -- returning 2 values
+extern void add4(int x, int *INOUT);        // *y += x    -- INOUT dual purpose variable
+

Examples/lua/functest/runme.lua

@@ -0,0 +1,20 @@
+---- importing ----
+if string.sub(_VERSION,1,7)=='Lua 5.0' then
+	-- lua5.0 doesnt have a nice way to do this
+	lib=loadlib('example.dll','Example_Init') or loadlib('example.so','Example_Init')
+	assert(lib)()
+else
+	-- lua 5.1 does
+	require('example')
+end
+
+
+x,y = 42,105
+print("add1 - simple arg passing and single return value -- ")
+print(example.add1(x,y))
+print("add2 - pointer arg passing and single return value through pointer arg -- ")
+print(example.add2(x,y))
+print("add3 - simple arg passing and double return value through return and ptr arg -- ")
+print(example.add3(x,y))
+print("add4 - dual use arg and return value -- ")
+print(example.add4(x,y))

Examples/lua/import.lua

@@ -0,0 +1,42 @@
+-- import
+-- the lua 5.0 loading mechanism is rather poor & relies upon the loadlib() fn
+-- the lua 5.1 loading mechanism is simplicity itself
+-- for now we need a bridge which will use the correct verion
+
+function import_5_0(module)
+	-- imports the file into the program
+	-- for a module 'example'
+	-- this must load 'example.dll' or 'example.so'
+	-- and look for the fn 'Example_Init()' (note the capitalisation)
+	if rawget(_G,module)~=nil then return end -- module appears to be loaded
+		
+	-- capitialising the first letter
+	local c=string.upper(string.sub(module,1,1))
+	local fnname=c..string.sub(module,2).."_Init"
+	
+	local suffix,lib
+	-- note: as there seems to be no way in lua to determine the platform
+	-- we will try loading all possible names
+	-- providing one works, we can load
+	for _,suffix in pairs{".dll",".so"} do
+		lib=loadlib(module..suffix,fnname)
+		if lib then -- found
+			break
+		end
+	end
+	assert(lib,"error loading module:"..module)
+	
+	lib() -- execute the function: initalising the lib
+	local m=rawget(_G,module)	-- gets the module object
+	assert(m~=nil,"no module table found")
+end
+
+function import_5_1(module)
+	require(module)
+end
+
+if string.sub(_VERSION,1,7)=='Lua 5.0' then
+	import=import_5_0
+else
+	import=import_5_1
+end

Examples/lua/pointer/Makefile

@@ -0,0 +1,19 @@
+TOP        = ../..
+SWIG       = $(TOP)/../swig
+CXXSRCS    = example.c
+TARGET     = example
+INTERFACE  = example.i
+LIBS       = 
+
+all::
+	$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' lua
+
+static::
+	$(MAKE) -f $(TOP)/Makefile CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	TARGET='mylua' INTERFACE='$(INTERFACE)' lua_static
+
+clean::
+	$(MAKE) -f $(TOP)/Makefile lua_clean
+
+check: all

Examples/lua/pointer/example.c

@@ -0,0 +1,16 @@
+/* File : example.c */
+
+void add(int *x, int *y, int *result) {
+  *result = *x + *y;
+}
+
+void sub(int *x, int *y, int *result) {
+  *result = *x - *y;
+}
+
+int divide(int n, int d, int *r) {
+   int q;
+   q = n/d;
+   *r = n - q*d;
+   return q;
+}

Examples/lua/pointer/example.i

@@ -0,0 +1,28 @@
+/* File : example.i */
+%module example
+
+%{
+   #include <stdlib.h>
+%}
+
+/* This example illustrates a couple of different techniques
+   for manipulating C pointers */
+
+/* First we'll use the pointer library */
+extern void add(int *x, int *y, int *result);
+%include cpointer.i
+%pointer_functions(int, intp);
+
+/* Next we'll use some typemaps */
+
+%include typemaps.i
+extern void sub(int *INPUT, int *INPUT, int *OUTPUT);
+
+/* Next we'll use typemaps and the %apply directive */
+
+%apply int *OUTPUT { int *r };
+extern int divide(int n, int d, int *r);
+
+
+
+

Examples/lua/pointer/runme.lua

@@ -0,0 +1,48 @@
+---- importing ----
+if string.sub(_VERSION,1,7)=='Lua 5.0' then
+	-- lua5.0 doesnt have a nice way to do this
+	lib=loadlib('example.dll','Example_Init') or loadlib('example.so','Example_Init')
+	assert(lib)()
+else
+	-- lua 5.1 does
+	require('example')
+end
+
+-- First create some objects using the pointer library.
+print("Testing the pointer library")
+a = example.new_intp()
+b = example.new_intp()
+c = example.new_intp()
+example.intp_assign(a,37)
+example.intp_assign(b,42)
+
+print("     a = "..tostring(a))
+print("     b = "..tostring(b))
+print("     c = "..tostring(c))
+
+-- Call the add() function with some pointers
+example.add(a,b,c)
+
+-- Now get the result
+r = example.intp_value(c)
+print("     37 + 42 = "..r)
+
+-- Clean up the pointers
+-- since this is C-style pointers you must clean it up
+example.delete_intp(a)
+example.delete_intp(b)
+example.delete_intp(c)
+
+-- Now try the typemap library
+-- This should be much easier. Now how it is no longer
+-- necessary to manufacture pointers.
+
+print("Trying the typemap library")
+r = example.sub(37,42)
+print("     37 - 42 = "..r)
+
+-- Now try the version with multiple return values
+
+print("Testing multiple return values")
+q,r = example.divide(42,37)
+print("     42/37 = "..q.." remainder "..r)