Added binding generator

1 files changed, 191 insertions, 0 deletions

diff --git a/binding_generator/src/main.rs b/binding_generator/src/main.rs
new file mode 100644
index 0000000..f7007c2
--- /dev/null
+++ b/binding_generator/src/main.rs
@@ -0,0 +1,191 @@
+extern crate serde_json;
+#[macro_use]
+extern crate serde_derive;
+
+
+use serde_json::*;
+use std::fs::File;
+use std::iter::Iterator;
+use std::io::prelude::*;
+
+#[derive(Deserialize)]
+struct GodotClass {
+	name: String,
+	base_class: String,
+	api_type: String,
+	singleton: bool,
+	instanciable: bool,
+	constants: Map<String, Value>,
+	methods: Vec<GodotMethod>
+}
+
+#[derive(Deserialize)]
+struct GodotMethod {
+	name: String,
+	return_type: String,
+	arguments: Vec<GodotArgument>
+}
+
+#[derive(Deserialize)]
+struct GodotArgument {
+	name: String,
+	#[serde(rename = "type")]
+	_type: String,
+	default_value: String
+}
+
+fn strip_name(s: &String) -> &str {
+	if s.starts_with("_") {
+		unsafe { s.slice_unchecked(1, s.len()) }
+	} else {
+		s.as_str()
+	}
+}
+
+fn main() {
+	let base_dir = "/home/karroffel/Gamedev/dlscript_cpp_example/src/include/godot_cpp/";
+
+	let mut file = File::open("/home/karroffel/Development/api.json").unwrap();
+
+	let mut file_contents = String::new();
+
+	file.read_to_string(&mut file_contents);
+
+	let json: Vec<GodotClass> = serde_json::from_str::<Vec<GodotClass>>(&file_contents).unwrap();
+
+	for class in json {
+		generate_class_binding((base_dir.to_string() + strip_name(&class.name) + ".h").as_str(), &class);
+	}
+}
+
+fn generate_class_binding(filename: &str, class: &GodotClass) {
+	let mut file = File::create(filename).unwrap();
+
+	file.write_all(generate_class_content(class).as_bytes());
+}
+
+fn generate_class_content(class: &GodotClass) -> String {
+	let mut contents = String::new();
+
+	contents = contents + "#ifndef ";
+	contents = contents + strip_name(&class.name).to_string().to_uppercase().as_str() + "_H\n";
+
+	contents = contents + "#define ";
+	contents = contents + strip_name(&class.name).to_string().to_uppercase().as_str() + "_H\n\n";
+
+	contents = contents + "\n#include \"core/CoreTypes.h\"\n";
+
+	contents = contents + "\n#include <godot.h>\n\n\n";
+
+	if class.base_class != "" {
+		contents = contents + "\n#include \"" + strip_name(&class.base_class) + ".h\"\n\n\n";
+	}
+
+	contents = contents + "namespace godot {\n\n";
+
+	contents = contents + "class " + strip_name(&class.name);
+
+	if class.base_class != "" {
+		contents = contents + " : public " + strip_name(&class.base_class);
+	}
+
+	contents = contents + " {\n";
+
+	if class.base_class == "" {
+		contents = contents + "protected:\n\tgodot_object *__core_object;\n\n";
+	}
+
+	contents = contents + "public:\n\n";
+
+	// default constructor
+
+	{
+		contents = contents + "\t" + strip_name(&class.name) + "() {\n";
+		contents = contents + "\t\t\n";
+		contents = contents + "\t}\n";
+	}
+
+
+	// pointer constructor
+	{
+		contents = contents + "\t" + strip_name(&class.name) + "(godot_object *ptr) {\n";
+		contents = contents + "\t\t__core_object = ptr;\n";
+		contents = contents + "\t}\n\n\n";
+	}
+
+	for (name, value) in &class.constants {
+		contents = contents + "\tconst static int " + name.as_str() + " = " + value.as_i64().unwrap().to_string().as_str() + ";\n";
+	}
+
+	contents += "\n\n";
+
+	for method in &class.methods {
+		contents = contents + "\t" + method.return_type.as_str() + " " + method.name.as_str() + "(";
+
+		for (i, argument) in (&method.arguments).iter().enumerate() {
+			if !is_primitive(&argument._type) {
+				contents += "const "
+			}
+			contents = contents + argument._type.as_str();
+			if !is_primitive(&argument._type) {
+				contents += "&";
+			}
+			contents = contents + " " + argument.name.as_str();
+			if i != method.arguments.len() - 1 {
+				contents += ", ";
+			}
+		}
+
+		contents = contents + ") {\n";
+
+		contents = contents + "\t\tstatic godot_method_bind *mb = NULL;\n"
+		                    + "\t\tif (mb == NULL) {\n"
+		                    + "\t\t\tmb = godot_method_bind_get_method(\"" + class.name.as_str() + "\", \"" + method.name.as_str() + "\");\n"
+		                    + "\t\t}\n";
+
+		if method.return_type != "void" {
+			contents = contents + "\t\t" + method.return_type.as_str() + " ret;" + "\n";
+		}
+
+		contents = contents + "\t\tconst void *args[] = {\n";
+
+		for argument in &method.arguments {
+			contents = contents + "\t\t\t";
+			if is_primitive(&argument._type) {
+				contents = contents + "&" + argument.name.as_str();
+			} else {
+				contents = contents + "(void *) &" + argument.name.as_str();
+			}
+			contents = contents + ",\n";
+		}
+
+		contents = contents + "\t\t};\n";
+
+		contents = contents + "\t\tgodot_method_bind_ptrcall(mb, __core_object, args, " + if method.return_type == "void" { "NULL" } else { "&ret" } + ");\n";
+
+		if method.return_type != "void" {
+			contents = contents + "\t\treturn ret;\n";
+		}
+
+		contents = contents + "\t}\n\n";
+	}
+
+	contents = contents + "};\n\n";
+
+	contents = contents + "}\n";
+
+	contents = contents + "#endif\n";
+
+	contents
+}
+
+
+fn is_core_type(name: &String) -> bool {
+	let core_types = vec!("Vector2", "Vector3", "String", "Variant");
+	core_types.contains(&name.as_str())
+}
+
+fn is_primitive(name: &String) -> bool {
+	let core_types = vec!("int", "bool", "real", "float");
+	core_types.contains(&name.as_str())
+}
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