Rust编写的JavaScript引擎,该项目是一个试验性质的项目。
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//! Module to read the list of test suites from disk.
use super::{Harness, Locale, Phase, Test, TestSuite, IGNORED};
use fxhash::FxHashMap;
use serde::Deserialize;
use std::{fs, io, path::Path, str::FromStr};
/// Representation of the YAML metadata in Test262 tests.
#[derive(Debug, Clone, Deserialize)]
pub(super) struct MetaData {
pub(super) description: Box<str>,
pub(super) esid: Option<Box<str>>,
pub(super) es5id: Option<Box<str>>,
pub(super) es6id: Option<Box<str>>,
#[serde(default)]
pub(super) info: Box<str>,
#[serde(default)]
pub(super) features: Box<[Box<str>]>,
#[serde(default)]
pub(super) includes: Box<[Box<str>]>,
#[serde(default)]
pub(super) flags: Box<[TestFlag]>,
#[serde(default)]
pub(super) negative: Option<Negative>,
#[serde(default)]
pub(super) locale: Locale,
}
/// Negative test information structure.
#[derive(Debug, Clone, Deserialize)]
pub(super) struct Negative {
pub(super) phase: Phase,
#[serde(rename = "type")]
pub(super) error_type: Box<str>,
}
/// Individual test flag.
#[derive(Debug, Clone, Copy, Deserialize)]
#[serde(rename_all = "camelCase")]
pub(super) enum TestFlag {
OnlyStrict,
NoStrict,
Module,
Raw,
Async,
Generated,
#[serde(rename = "CanBlockIsFalse")]
CanBlockIsFalse,
#[serde(rename = "CanBlockIsTrue")]
CanBlockIsTrue,
#[serde(rename = "non-deterministic")]
NonDeterministic,
}
impl FromStr for TestFlag {
type Err = String; // TODO: improve error type.
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"onlyStrict" => Ok(Self::OnlyStrict),
"noStrict" => Ok(Self::NoStrict),
"module" => Ok(Self::Module),
"raw" => Ok(Self::Raw),
"async" => Ok(Self::Async),
"generated" => Ok(Self::Generated),
"CanBlockIsFalse" => Ok(Self::CanBlockIsFalse),
"CanBlockIsTrue" => Ok(Self::CanBlockIsTrue),
"non-deterministic" => Ok(Self::NonDeterministic),
_ => Err(format!("unknown test flag: {}", s)),
}
}
}
/// Reads the Test262 defined bindings.
pub(super) fn read_harness(test262_path: &Path) -> io::Result<Harness> {
let mut includes = FxHashMap::default();
for entry in fs::read_dir(test262_path.join("harness"))? {
let entry = entry?;
let file_name = entry.file_name();
let file_name = file_name.to_string_lossy();
if file_name == "assert.js" || file_name == "sta.js" {
continue;
}
let content = fs::read_to_string(entry.path())?;
includes.insert(
file_name.into_owned().into_boxed_str(),
content.into_boxed_str(),
);
}
let assert = fs::read_to_string(test262_path.join("harness/assert.js"))?.into_boxed_str();
let sta = fs::read_to_string(test262_path.join("harness/sta.js"))?.into_boxed_str();
Ok(Harness {
assert,
sta,
includes,
})
}
/// Reads a test suite in the given path.
pub(super) fn read_suite(path: &Path) -> io::Result<TestSuite> {
let name = path
.file_name()
.ok_or_else(|| {
io::Error::new(
io::ErrorKind::InvalidInput,
format!("test suite with no name found: {}", path.display()),
)
})?
.to_str()
.ok_or_else(|| {
io::Error::new(
io::ErrorKind::InvalidInput,
format!("non-UTF-8 suite name found: {}", path.display()),
)
})?;
let mut suites = Vec::new();
let mut tests = Vec::new();
// TODO: iterate in parallel
for entry in path.read_dir()? {
let entry = entry?;
if entry.file_type()?.is_dir() {
suites.push(read_suite(entry.path().as_path())?);
} else if entry.file_name().to_string_lossy().ends_with("_FIXTURE.js") {
continue;
} else if IGNORED.contains_file(&entry.file_name().to_string_lossy()) {
let mut test = Test::default();
test.set_name(entry.file_name().to_string_lossy());
tests.push(test)
} else {
tests.push(read_test(entry.path().as_path())?);
}
}
Ok(TestSuite {
name: name.into(),
suites: suites.into_boxed_slice(),
tests: tests.into_boxed_slice(),
})
}
/// Reads information about a given test case.
pub(super) fn read_test(path: &Path) -> io::Result<Test> {
let name = path
.file_stem()
.ok_or_else(|| {
io::Error::new(
io::ErrorKind::InvalidInput,
format!("test with no file name found: {}", path.display()),
)
})?
.to_str()
.ok_or_else(|| {
io::Error::new(
io::ErrorKind::InvalidInput,
format!("non-UTF-8 file name found: {}", path.display()),
)
})?;
let content = fs::read_to_string(path)?;
let metadata = read_metadata(&content)?;
Ok(Test::new(name, content, metadata))
}
/// Reads the metadata from the input test code.
fn read_metadata(code: &str) -> io::Result<MetaData> {
use once_cell::sync::Lazy;
use regex::Regex;
/// Regular expression to retrieve the metadata of a test.
static META_REGEX: Lazy<Regex> = Lazy::new(|| {
Regex::new(r#"/\*\-{3}((?:.|\n)*)\-{3}\*/"#)
.expect("could not compile metadata regular expression")
});
let yaml = META_REGEX
.captures(code)
.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "no metadata found"))?
.get(1)
.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "no metadata found"))?
.as_str()
.replace('\r', "\n");
serde_yaml::from_str(&yaml).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))
}