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use crate::ast;
use crate::parsing::Opaque;
use crate::{
OptionSpanned, Parse, ParseError, ParseErrorKind, Parser, Spanned, ToTokens, TokenStream,
};
use runestick::{Id, Span};
/// A function call `<expr>!(<args>)`.
#[derive(Debug, Clone, PartialEq, Eq, ToTokens, Spanned)]
pub struct MacroCall {
/// Opaque identifier for macro call. Use to store reference to internally
/// expanded macros.
#[rune(id)]
pub id: Option<Id>,
/// Attributes associated with macro call.
#[rune(iter)]
pub attributes: Vec<ast::Attribute>,
/// The expression being called over.
pub path: ast::Path,
/// Bang operator `!`.
pub bang: T![!],
/// Opening token.
pub open: ast::Token,
/// The tokens provided to the macro.
#[rune(optional)]
pub stream: TokenStream,
/// Closing token.
pub close: ast::Token,
}
impl MacroCall {
/// Test if macro needs semi or not.
pub fn needs_semi(&self) -> bool {
!matches!(self.close.kind, K!['}'])
}
/// Wrap the expression into an expression that matches the semi convention
/// of the macro call.
pub fn adjust_expr_semi(&self, expr: ast::Expr) -> ast::Expr {
if self.needs_semi() != expr.needs_semi() {
ast::Expr::ForceSemi(Box::new(ast::ForceSemi {
needs_semi: self.needs_semi(),
span: self.span(),
expr,
}))
} else {
expr
}
}
/// The span of the token stream.
pub fn stream_span(&self) -> Span {
if let Some(span) = self.stream.option_span() {
span
} else {
self.open.span.end()
}
}
/// Parse with an expression.
pub fn parse_with_meta_path(
parser: &mut Parser,
attributes: Vec<ast::Attribute>,
path: ast::Path,
) -> Result<Self, ParseError> {
let bang = parser.parse()?;
let mut level = 1;
let open = parser.next()?;
let delim = match open.kind {
ast::Kind::Open(delim) => delim,
_ => {
return Err(ParseError::expected(
&open,
"macro call delimiter `(`, `[`, or `{`",
));
}
};
let close;
let mut stream = Vec::new();
loop {
let token = parser.next()?;
match token.kind {
ast::Kind::Open(..) => level += 1,
ast::Kind::Close(actual) => {
level -= 1;
if level == 0 {
if actual != delim {
return Err(ParseError::new(
open,
ParseErrorKind::ExpectedMacroCloseDelimiter {
actual: token.kind,
expected: ast::Kind::Close(delim),
},
));
}
close = token;
break;
}
}
_ => (),
}
stream.push(token);
}
Ok(Self {
id: Default::default(),
attributes,
bang,
path,
open,
stream: TokenStream::from(stream),
close,
})
}
}
impl Parse for MacroCall {
fn parse(parser: &mut Parser) -> Result<Self, ParseError> {
let attributes = parser.parse()?;
let path = parser.parse()?;
Self::parse_with_meta_path(parser, attributes, path)
}
}
impl Opaque for MacroCall {
fn id(&self) -> Option<Id> {
self.id
}
}