1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
//! 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 emphasis;
pub mod gloss_list;
pub mod itemized_list;
pub mod paragraph;
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),
}
|
