From dc2493e7525bb7633f697ef10f72b72b46222249 Mon Sep 17 00:00:00 2001
From: Andy Belle-Isle <drumsetmonkey@gmail.com>
Date: Fri, 30 Aug 2019 00:45:36 -0400
Subject: Forget what I said, I just need to change git attributes to mark for
 vendor

---
 lib/sol2/examples/source/custom_reader.cpp | 95 ++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 lib/sol2/examples/source/custom_reader.cpp

(limited to 'lib/sol2/examples/source/custom_reader.cpp')

diff --git a/lib/sol2/examples/source/custom_reader.cpp b/lib/sol2/examples/source/custom_reader.cpp
new file mode 100644
index 0000000..3e0d430
--- /dev/null
+++ b/lib/sol2/examples/source/custom_reader.cpp
@@ -0,0 +1,95 @@
+#define SOL_ALL_SAFETIES_ON 1
+#include <sol/sol.hpp>
+
+#include "assert.hpp"
+
+#include <iostream>
+#include <exception>
+#include <fstream>
+
+struct custom_reader {
+	FILE* f;
+	// We use 2 here to demonstrate
+	// multiple calls to the function to
+	// parse whole file.
+	// Please don't use 2.
+	// PLEASE DO NOT USE A BUFFER
+	// OF SIZE 2!
+	char buffer[2];
+	std::size_t current_size;
+	std::size_t read_count;
+
+	custom_reader(FILE* f_) : f(f_), buffer(), current_size(0), read_count(0) {
+
+	}
+
+	bool read() {
+		std::cout << "custom read: read #" << ++read_count << std::endl;
+		current_size = fread( buffer, 1, 2, f );
+		return current_size > 0 && ferror(f) == 0;
+	}
+
+	~custom_reader( ) {
+		std::fclose( f );
+	}
+};
+
+// function must match signature found in type lua_Reader:
+// const char* ( lua_State*, void*, size_t* )
+const char* custom_reader_function(lua_State*, void* pointer_to_my_object, size_t* data_size) {
+	custom_reader& cr = *(static_cast<custom_reader*>(pointer_to_my_object));
+	if ( cr.read( ) ) {
+		*data_size = cr.current_size;
+		return cr.buffer;
+	}
+	else {
+		*data_size = 0;
+		return nullptr;
+	}
+}
+
+int main( ) {
+	std::cout << "=== custom reader ===" << std::endl;
+
+	// make a file to use for the custom reader
+	{
+		std::ofstream bjork("bjork.lua", std::ios::binary);
+		bjork << "print('hello!')\n";
+	}
+	struct on_scope_exit {
+		~on_scope_exit() {
+			// remove file when done
+			std::remove("bjork.lua");
+		}
+	} remove_on_exit;
+
+
+	sol::state lua;
+	lua.open_libraries( sol::lib::base );
+
+	FILE* bjork_fp;
+#ifdef _MSC_VER
+	if ( fopen_s( &bjork_fp, "bjork.lua", "r" ) != 0 ) {
+		std::cerr << "failed to open bjork.lua -- exiting" << std::endl;
+		return -1;
+	}
+#else
+	bjork_fp = fopen( "bjork.lua", "r" );
+#endif
+	if (bjork_fp == nullptr) {
+		std::cerr << "failed to open bjork.lua -- exiting" << std::endl;
+		return -1;
+	}
+	custom_reader reader(bjork_fp);
+
+	// load the code using our custom reader, then run it
+	auto result = lua.safe_script( custom_reader_function, &reader, sol::script_pass_on_error );
+	// make sure we ran loaded and ran the code successfully
+	c_assert( result.valid( ) );
+
+	// note there are lua.load( ... ) variants that take a 
+	// custom reader than JUST run the code, too!
+
+	std::cout << std::endl;
+	return 0;
+}
-- 
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