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|
//! Rust API for the [OpenGL API and Extension Registry].
//!
//! # Usage
//! ```
//! use opengl_registry::Registry;
//!
//! let registry = Registry::retrieve().unwrap();
//!
//! for command in registry.commands() {
//! println!("Command {}", command.prototype().name());
//! println!(" Return type: {}", command.prototype().return_type());
//! println!(" Parameters:");
//!
//! for param in command.parameters() {
//! println!(" {} {}", param.get_type(), param.name());
//! }
//! }
//! ```
//!
//! [OpenGL API and Extension Registry]: https://github.com/KhronosGroup/OpenGL-Registry
#![cfg_attr(doc_cfg, feature(doc_cfg))]
#![deny(clippy::all, clippy::pedantic, missing_docs)]
use std::fs::File;
use std::io::Read;
use crate::command::{Command, Error as CommandError};
use crate::xml::element::{Element, Elements, FromElements};
use crate::xml::parser::{Error as ParserError, Parser};
pub mod command;
mod xml;
#[cfg(feature = "include-xml")]
const GL_REGISTRY_XML: &[u8] = include_bytes!("../OpenGL-Registry/xml/gl.xml");
const REGISTRY_TAG_NAME: &str = "registry";
/// Representation of the OpenGL registry.
pub struct Registry
{
commands: Vec<Command>,
}
impl Registry
{
/// Retrieves the OpenGL registry from a included XML file.
///
/// # Errors
/// Returns `Err` if parsing fails in any way.
#[cfg(feature = "include-xml")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "include-xml")))]
pub fn retrieve() -> Result<Registry, RegistryError>
{
Self::retrieve_from_bytes(GL_REGISTRY_XML)
}
/// Retrieves the OpenGL registry from XML bytes.
///
/// # Errors
/// Returns `Err` if parsing fails in any way.
pub fn retrieve_from_bytes(xml_bytes: &[u8]) -> Result<Registry, RegistryError>
{
let mut parser = Parser::new(xml_bytes);
let elements = parser.parse().map_err(ParsingError)?;
let registry_element = elements
.get_first_tagged_element(REGISTRY_TAG_NAME)
.ok_or(RegistryError::MissingRegistryElement)?;
let registry = Registry::from_elements(registry_element.child_elements())?;
Ok(registry)
}
/// Retrieves the OpenGL registry from a XML file.
///
/// # Errors
/// Returns `Err` if:
/// - Parsing fails in any way.
/// - An I/O error occurs.
pub fn retrieve_from_file(xml_file: &mut File) -> Result<Registry, RegistryError>
{
let mut buf = Vec::new();
xml_file.read_to_end(&mut buf)?;
Self::retrieve_from_bytes(&buf)
}
/// Creates a new `Registry`.
///
/// # Note
/// This will **NOT** use anything from the actual OpenGL registry. Use the
/// [`Registry::retrieve`] method for that.
pub fn new(commands: impl IntoIterator<Item = Command>) -> Self
{
Self {
commands: commands.into_iter().collect(),
}
}
/// Returns the available commands.
#[must_use]
pub fn commands(&self) -> &[Command]
{
&self.commands
}
}
impl FromElements for Registry
{
type Error = RegistryError;
fn from_elements(elements: &Elements) -> Result<Self, Self::Error>
{
let commands_element = elements
.get_first_tagged_element("commands")
.ok_or(Self::Error::MissingCommandsElement)?;
let command_elements =
commands_element
.child_elements()
.into_iter()
.filter_map(|element| match element {
Element::Tagged(tagged_element)
if tagged_element.name() == "command" =>
{
Some(tagged_element)
}
_ => None,
});
let commands = command_elements
.into_iter()
.map(|command_element| {
Command::from_elements(command_element.child_elements())
})
.collect::<Result<Vec<_>, _>>()?;
Ok(Self { commands })
}
}
/// [`Registry`] error.
#[derive(Debug, thiserror::Error)]
pub enum RegistryError
{
/// No 'registry' element was found.
#[error("No 'registry' element was found")]
MissingRegistryElement,
/// No 'commands' element was found.
#[error("No 'commands' element was found")]
MissingCommandsElement,
/// A command is invalid.
#[error("Invalid command")]
InvalidCommand(#[from] CommandError),
/// Parsing failed.
#[error("Parsing failed")]
ParsingFailed(#[from] ParsingError),
/// I/O failed.
#[error("I/O failed")]
IOFailed(#[from] std::io::Error),
}
/// Parsing error.
#[derive(Debug, thiserror::Error)]
#[error(transparent)]
pub struct ParsingError(#[from] ParserError);
|
