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build.rs
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build.rs
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use std::env;
use std::fs::read_to_string;
use std::fs::File;
use std::io::Write;
use std::path::Path;
use glob::glob;
use langtag::LanguageTag;
use serde::{de::Error, Deserialize, Deserializer};
#[derive(Clone, Debug, PartialEq)]
struct Range(u32, u32);
#[derive(Debug, Deserialize)]
struct Language {
anglicized_name: String,
native_name: String,
codepoints: Vec<Range>,
tag: Option<String>,
}
#[derive(Debug)]
pub struct Metadata {
pub tag: String,
pub name: String,
pub native_name: String,
}
impl<'l> Deserialize<'l> for Range {
fn deserialize<T>(deserializer: T) -> Result<Self, T::Error>
where
T: Deserializer<'l>,
{
let s: &str = Deserialize::deserialize(deserializer)?;
if s.contains("..") {
s.split("..")
.map(|x| x.parse::<u32>())
.collect::<Result<Vec<_>, _>>()
.map(|v| Range(v[0], v[1]))
.map_err(T::Error::custom)
} else {
s.parse::<u32>()
.map(|i| Range(i, i))
.map_err(T::Error::custom)
}
}
}
fn parse_yaml<T: AsRef<Path>>(path: T) -> Language {
let path = path.as_ref();
let s = read_to_string(path).unwrap();
// The Serde YAML parser expects YAML types to have names that are valid
// Rust identifiers. Sadly, that is not the case here, so we manually perform
// a string replace to patch up the data.
let mut d: Language = serde_yml::from_str(&s.replace("ruby/range", "Range")).unwrap();
d.tag = Some(
path.file_name()
.unwrap()
.to_os_string()
.into_string()
.unwrap(),
);
// Sort the ranges so we can exit early when running the detection code.
d.codepoints.sort_by_key(|c| c.0);
d
}
fn main() {
let languages: Vec<Language> = glob("./speakeasy/data/*")
.unwrap()
.map(Result::unwrap)
.map(parse_yaml)
.filter(|l| LanguageTag::parse(l.tag.as_ref().unwrap()).is_ok())
.collect();
let ranges: Vec<Vec<Range>> = languages.iter().map(|l| l.codepoints.to_vec()).collect();
let totals: Vec<u32> = ranges
.iter()
.map(|ranges| ranges.iter().map(|c| c.1 - c.0 + 1).sum::<u32>())
.collect();
let metadata: Vec<Metadata> = languages
.into_iter()
.map(|l| Metadata {
tag: l.tag.as_ref().unwrap().clone(),
name: l.anglicized_name.clone(),
native_name: l.native_name.clone(),
})
.collect();
let language_count = ranges.len();
let ranges_str = ranges
.iter()
.map(|ranges| {
format!(
"&[{}]",
ranges
.iter()
.map(|c| format!("[{}, {}]", c.0, c.1))
.collect::<Vec<_>>()
.join(", ")
)
})
.collect::<Vec<_>>()
.join(", ");
let out_dir = env::var("OUT_DIR").unwrap();
let dest_path = Path::new(&out_dir).join("data.rs");
let mut f = File::create(dest_path).unwrap();
write!(
f,
r#"
/// A Unicode codepoint
pub type Codepoint = u32;
/// A range of Unicode codepoints.
pub type Range<T> = [T; 2];
struct Metadata {{
tag: &'static str,
name: &'static str,
native_name: &'static str,
}}
#[cfg(not(test))]
const LANGUAGE_COUNT: usize = {language_count};
#[cfg(test)]
const LANGUAGE_COUNT: usize = 5;
#[cfg(not(test))]
const RANGES: [&[Range<Codepoint>]; LANGUAGE_COUNT] = [{ranges_str}];
#[cfg(test)]
const RANGES: [&[Range<Codepoint>]; LANGUAGE_COUNT] = [&[[1, 3]], &[[4, 6]], &[[7, 9]], &[[8, 8]], &[[16,16]]];
#[cfg(not(test))]
const TOTALS: [u32; LANGUAGE_COUNT] = {totals:?};
#[cfg(test)]
const TOTALS: [u32; LANGUAGE_COUNT] = [3, 3, 3, 1, 1];
#[cfg(not(test))]
const METADATA: [Metadata; LANGUAGE_COUNT] = {metadata:?};
#[cfg(test)]
const METADATA: [Metadata; LANGUAGE_COUNT] = [
Metadata {{ tag: "t1", name: "test1", native_name: "ntest1" }},
Metadata {{ tag: "t2", name: "test2", native_name: "ntest2" }},
Metadata {{ tag: "t3", name: "test3", native_name: "ntest3" }},
Metadata {{ tag: "t4", name: "test4", native_name: "ntest4" }},
Metadata {{ tag: "t5", name: "test5", native_name: "ntest5" }},
];
"#
)
.unwrap();
}