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/// A stream of tokens
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct TokenStream(pub String);
impl From<String> for TokenStream {
fn from(tokens: String) -> Self {
Self(tokens)
}
}
impl From<&String> for TokenStream {
fn from(tokens: &String) -> Self {
Self(tokens.to_string())
}
}
impl From<&str> for TokenStream {
fn from(tokens: &str) -> Self {
Self(tokens.to_string())
}
}
impl TokenStream {
pub fn new() -> Self {
Self(String::new())
}
/// Appends another stream to the stream
///
/// note: a space will be inserted before the other stream
pub fn combine(&mut self, other: &TokenStream) {
self.push_space();
self.0.push_str(&other.0)
}
#[must_use]
pub fn join(&self, value: &str) -> Self {
Self(format!("{}{value}", self.0))
}
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
/// View the stream as a string
pub fn as_str(&self) -> &str {
&self.0
}
/// Convert the stream into a `String`
pub fn into_string(self) -> String {
self.0
}
/// Parse the token stream as something
///
/// Mostly used with `proc_macro2::TokenStream` or `proc_macro::TokenStream`
pub fn parse<T: core::str::FromStr>(self) -> Result<T, T::Err> {
self.into_string().parse()
}
pub(crate) fn push_space(&mut self) {
match self.last_char() {
None | Some(' ') => {}
_ => self.0.push(' '),
}
}
pub fn push(&mut self, c: char) {
self.0.push(c)
}
pub fn push_str(&mut self, str: &str) {
self.0.push_str(str)
}
fn last_char(&self) -> Option<char> {
self.0.chars().last()
}
}
impl Default for TokenStream {
fn default() -> Self {
Self::new()
}
}
impl core::iter::FromIterator<TokenStream> for TokenStream {
fn from_iter<I: IntoIterator<Item = TokenStream>>(iter: I) -> Self {
iter.into_iter()
.fold(None, |accum: Option<TokenStream>, n| {
let mut ts = accum.unwrap_or_else(TokenStream::new);
ts.combine(&n);
Some(ts)
})
.unwrap_or_else(TokenStream::new)
}
}
/// A delimiter around a block of code
#[derive(Copy, Clone)]
pub enum Delimiter {
/// `[]`
Bracket,
/// `{}`
Brace,
/// `()`
Parenthesis,
}
impl Delimiter {
/// The opening delimiter
pub fn open(self) -> char {
match self {
Delimiter::Bracket => '[',
Delimiter::Brace => '{',
Delimiter::Parenthesis => '(',
}
}
/// The closing delimiter
pub fn close(self) -> char {
match self {
Delimiter::Bracket => ']',
Delimiter::Brace => '}',
Delimiter::Parenthesis => ')',
}
}
}
/// A literal of some sort
pub struct Literal {
inner: String,
}
macro_rules! unsuffixed {
($ty:ty => $name:ident) => {
pub fn $name(n: $ty) -> Self {
Self { inner: n.to_string() }
}
};
}
impl Literal {
unsuffixed!(i64 => i64_unsuffixed);
unsuffixed!(usize => usize_unsuffixed);
unsuffixed!(u32 => u32_unsuffixed);
unsuffixed!(u16 => u16_unsuffixed);
unsuffixed!(u8 => u8_unsuffixed);
pub fn byte_string(s: &[u8]) -> Self {
Self { inner: format!("b\"{}\"", core::str::from_utf8(s).expect("Could not turn bytes into byte literal")) }
}
pub fn as_str(&self) -> &str {
&self.inner
}
}
impl core::fmt::Display for TokenStream {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "{}", self.as_str())
}
}
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