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use serde::{de, Deserialize};
use std::collections::BTreeMap;
pub fn parse_tests(
reader: impl std::io::Read,
) -> Result<impl Iterator<Item = Test>, serde_json::Error> {
let Tests { tests } = serde_json::from_reader(reader)?;
Ok(tests.into_iter().map(undo_double_escaping))
}
#[derive(Debug, Deserialize)]
pub enum InitialState {
#[serde(rename = "Data state")]
Data,
#[serde(rename = "PLAINTEXT state")]
Plaintext,
#[serde(rename = "RCDATA state")]
Rcdata,
#[serde(rename = "RAWTEXT state")]
Rawtext,
#[serde(rename = "Script data state")]
ScriptData,
#[serde(rename = "CDATA section state")]
CdataSection,
}
fn initial_states_default() -> Vec<InitialState> {
vec![InitialState::Data]
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct Test {
pub description: String,
pub input: String,
#[serde(default = "initial_states_default")]
pub initial_states: Vec<InitialState>,
#[serde(flatten)]
pub output: Output,
#[serde(default)]
double_escaped: bool,
#[serde(default)]
pub last_start_tag: Option<String>,
}
#[derive(Deserialize, PartialEq, Eq, Debug)]
pub struct Output {
#[serde(default)]
pub errors: Vec<Error>,
#[serde(rename = "output")]
pub tokens: Vec<Token>,
}
#[derive(Debug, PartialEq, Eq)]
pub enum Token {
Doctype {
name: Option<String>,
public_id: Option<String>,
system_id: Option<String>,
force_quirks: bool,
},
StartTag {
name: String,
attributes: BTreeMap<String, String>,
self_closing: bool,
},
EndTag {
name: String,
},
Comment(String),
Character(String),
}
impl<'de> Deserialize<'de> for Token {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
deserializer.deserialize_seq(TokenVisitor)
}
}
#[derive(Deserialize)]
enum TokenType {
#[serde(rename = "DOCTYPE")]
Doctype,
StartTag,
EndTag,
Comment,
Character,
}
struct TokenVisitor;
impl<'de> de::Visitor<'de> for TokenVisitor {
type Value = Token;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
formatter.write_str("an array describing a token")
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: serde::de::SeqAccess<'de>,
{
let typ: TokenType = seq.next_element()?.ok_or(
de::Error::custom(
r#"expected first array element to be one of "DOCTYPE", "StartTag", "EndTag", "Comment" or "Character""#,
)
)?;
Ok(match typ {
TokenType::Doctype => Token::Doctype {
name: seq
.next_element()?
.ok_or(de::Error::missing_field("name"))?,
public_id: seq
.next_element()?
.ok_or(de::Error::missing_field("public_id"))?,
system_id: seq
.next_element()?
.ok_or(de::Error::missing_field("system_id"))?,
force_quirks: !seq
.next_element()?
.ok_or(de::Error::missing_field("correctness"))?,
},
TokenType::StartTag => Token::StartTag {
name: seq
.next_element()?
.ok_or(de::Error::missing_field("name"))?,
attributes: seq
.next_element()?
.ok_or(de::Error::missing_field("attributes"))?,
self_closing: seq.next_element()?.unwrap_or_default(),
},
TokenType::EndTag => Token::EndTag {
name: seq
.next_element()?
.ok_or(de::Error::missing_field("name"))?,
},
TokenType::Comment => Token::Comment(
seq.next_element()?
.ok_or(de::Error::missing_field("data"))?,
),
TokenType::Character => Token::Character(
seq.next_element()?
.ok_or(de::Error::missing_field("data"))?,
),
})
}
}
#[derive(Deserialize, Debug, Eq, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct Error {
pub code: String,
// TODO: lineno and column?
}
#[derive(Deserialize)]
struct Tests {
tests: Vec<Test>,
}
fn undo_double_escaping(mut test: Test) -> Test {
if test.double_escaped {
test.input = unescape(&test.input);
test.output.tokens = test
.output
.tokens
.into_iter()
.map(|token| match token {
Token::Character(x) => Token::Character(unescape(&x)),
Token::Comment(x) => Token::Comment(unescape(&x)),
token => token,
})
.collect();
}
test
}
/// Implements the escape sequences described in the tokenizer tests of html5lib-tests (and nothing
/// more)
fn unescape(data: &str) -> String {
let mut stream = data.chars();
let mut rv = String::new();
loop {
match stream.next() {
Some('\\') => (),
Some(x) => {
rv.push(x);
continue;
}
None => break,
}
match stream.next() {
Some('u') => (),
x => panic!("unexpected escape: {:?}", x),
}
let orig_len = rv.len();
for _ in 0..4 {
rv.push(match stream.next() {
Some(x) => x,
None => panic!("unexpected eof after \\u"),
});
}
let c = u32::from_str_radix(&rv[orig_len..], 16).expect("failed to parse as hex");
let c = char::from_u32(c).expect("bad character");
rv.truncate(orig_len);
rv.push(c);
}
rv
}
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