Add a few helper functions

src/Nazara/Shader/ShaderLangParser.cpp

@@ -1006,5 +1006,25 @@ namespace Nz::ShaderLang
 			case TokenType::Dot:      return 50;
 			default: return -1;
 		}
+	}
+
+	ShaderAst::StatementPtr Parse(const std::filesystem::path& sourcePath)
+	{
+		File file(sourcePath);
+		if (!file.Open(OpenMode_ReadOnly | OpenMode_Text))
+		{
+			NazaraError("Failed to open \"" + sourcePath.generic_u8string() + '"');
+			return {};
 		}
+
+		std::size_t length = static_cast<std::size_t>(file.GetSize());
+
+		std::vector<Nz::UInt8> source(length);
+		if (file.Read(&source[0], length) != length)
+		{
+			NazaraError("Failed to read program file");
+			return {};
+		}
+
+		return Parse(Tokenize(std::string_view(reinterpret_cast<const char*>(source.data()), source.size())));
 	}