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//! Rust API for the [OpenGL reference page sources].
//!
//! [OpenGL reference page sources]: https://github.com/KhronosGroup/OpenGL-Refpages
#![cfg_attr(doc_cfg, feature(doc_cfg))]
#![deny(clippy::all, clippy::pedantic, missing_docs)]
use std::ffi::OsStr;
use std::os::unix::prelude::OsStrExt;
use include_dir::{include_dir, Dir};
use crate::description::{Description, Error as DescriptionError};
use crate::xml::element::{Elements, FromElements};
use crate::xml::parser::{Error as ParserError, Parser};
pub mod description;
pub mod itemized_list;
pub mod table;
pub mod variable_list;
mod xml;
static GL4_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/OpenGL-Refpages/gl4");
/// Reference entry.
#[derive(Debug)]
pub struct ReferenceEntry
{
purpose: String,
descriptions: Vec<Description>,
}
impl ReferenceEntry
{
/// Returns a new `ReferenceEntry`.
pub fn new(
purpose: &impl ToString,
descriptions: impl IntoIterator<Item = Description>,
) -> Self
{
Self {
purpose: purpose.to_string(),
descriptions: descriptions.into_iter().collect(),
}
}
/// Returns a function reference entry.
///
/// # Errors
/// Returns `Err` if
/// - No reference entry file was found.
/// - Parsing the reference entry file data fails.
/// - The reference entry file data is invalid.
pub fn get_function(function_name: &str) -> Result<Self, ReferenceEntryError>
{
let xml_files = GL4_DIR
.files()
.filter(|file| {
file.path()
.extension()
.map_or_else(|| false, |extension| extension.as_bytes() == b"xml")
})
.collect::<Vec<_>>();
let function_file = xml_files
.iter()
.find_map(|file| {
if file.path().file_stem()?.to_str()? == function_name {
Some(file)
} else {
None
}
})
.or_else(|| {
xml_files.iter().find_map(|file| {
let file_stem = file.path().file_stem()?.to_str()?;
if function_name.starts_with(file_stem) {
Some(file)
} else {
None
}
})
})
.ok_or_else(|| ReferenceEntryError::NoFileFound(function_name.to_string()))?;
let function_ref_content = function_file.contents();
let mut parser = Parser::new(function_ref_content);
let root_elements =
parser
.parse()
.map_err(|err| ReferenceEntryError::ParsingFailed {
source: err,
entry_name: function_file
.path()
.file_stem()
.unwrap_or_else(|| OsStr::new("(unknown)"))
.to_string_lossy()
.to_string(),
})?;
ReferenceEntry::from_elements(&root_elements).map_err(|err| {
ReferenceEntryError::Invalid {
source: err,
entry_name: function_file
.path()
.file_stem()
.unwrap_or_else(|| OsStr::new("(unknown)"))
.to_string_lossy()
.to_string(),
}
})
}
/// Returns the reference entry purpose.
#[must_use]
pub fn purpose(&self) -> &str
{
&self.purpose
}
/// Returns the reference entry descriptions.
#[must_use]
pub fn descriptions(&self) -> &[Description]
{
&self.descriptions
}
}
impl FromElements for ReferenceEntry
{
type Error = InvalidReferenceEntryError;
fn from_elements(elements: &Elements) -> Result<Self, Self::Error>
{
let refentry_element = elements
.get_first_tagged_with_name("refentry")
.ok_or(Self::Error::MissingRefEntry)?;
let refnamediv_element = refentry_element
.child_elements()
.get_first_tagged_with_name("refnamediv")
.ok_or(Self::Error::MissingRefNameDiv)?;
let refpurpose_element = refnamediv_element
.child_elements()
.get_first_tagged_with_name("refpurpose")
.ok_or(Self::Error::MissingRefPurpose)?;
let purpose = refpurpose_element
.child_elements()
.get_first_text_element()
.cloned()
.unwrap_or_default();
let description_elements = refentry_element
.child_elements()
.get_all_tagged_with_name_and_attr("refsect1", |attr| {
attr.key == "xml:id" && attr.value.starts_with(b"description")
});
if description_elements.is_empty() {
return Err(Self::Error::MissingDescriptionRefSect);
}
let descriptions = description_elements
.iter()
.map(|description_element| {
Description::from_elements(description_element.child_elements())
})
.collect::<Result<Vec<_>, _>>()?;
Ok(ReferenceEntry {
purpose,
descriptions,
})
}
}
/// [`ReferenceEntry`] error.
#[derive(Debug, thiserror::Error)]
pub enum ReferenceEntryError
{
/// No reference entry file was found.
#[error("No reference entry file was found for '{0}'")]
NoFileFound(String),
/// The data of the reference entry is invalid.
#[error("Invalid reference entry '{entry_name}'")]
Invalid
{
/// Source error.
#[source]
source: InvalidReferenceEntryError,
/// Name of the invalid reference entry.
entry_name: String,
},
/// Parsing failed.
#[error("Failed to parse reference entry '{entry_name}'")]
ParsingFailed
{
/// Source error.
#[source]
source: ParserError,
/// Name of the reference entry that couldn't be parsed.
entry_name: String,
},
}
/// Error for when a reference entry is invalid.
#[derive(Debug, thiserror::Error)]
pub enum InvalidReferenceEntryError
{
/// No 'refentry' element was found.
#[error("No 'refentry' element was found")]
MissingRefEntry,
/// No 'refnamediv' element was found.
#[error("No 'refnamediv' element was found")]
MissingRefNameDiv,
/// No 'refpurpose' element was found.
#[error("No 'refpurpose' element was found")]
MissingRefPurpose,
/// No 'refsect1' element was found with id 'description''.
#[error("No 'refsect1' element was found with id 'description'")]
MissingDescriptionRefSect,
/// Invalid description.
#[error("Invalid description")]
InvalidDescription(#[from] DescriptionError),
}
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