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|
//! Various extension methods to ast Expr Nodes, which are hard to code-generate.
use crate::{
ast::{self, support, AstChildren, AstNode},
SmolStr,
SyntaxKind::*,
SyntaxToken, T,
};
impl ast::Expr {
pub fn is_block_like(&self) -> bool {
match self {
ast::Expr::IfExpr(_)
| ast::Expr::LoopExpr(_)
| ast::Expr::ForExpr(_)
| ast::Expr::WhileExpr(_)
| ast::Expr::BlockExpr(_)
| ast::Expr::MatchExpr(_)
| ast::Expr::TryBlockExpr(_) => true,
_ => false,
}
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ElseBranch {
Block(ast::BlockExpr),
IfExpr(ast::IfExpr),
}
impl ast::IfExpr {
pub fn then_branch(&self) -> Option<ast::BlockExpr> {
self.blocks().next()
}
pub fn else_branch(&self) -> Option<ElseBranch> {
let res = match self.blocks().nth(1) {
Some(block) => ElseBranch::Block(block),
None => {
let elif: ast::IfExpr = support::child(self.syntax())?;
ElseBranch::IfExpr(elif)
}
};
Some(res)
}
pub fn blocks(&self) -> AstChildren<ast::BlockExpr> {
support::children(self.syntax())
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum PrefixOp {
/// The `*` operator for dereferencing
Deref,
/// The `!` operator for logical inversion
Not,
/// The `-` operator for negation
Neg,
}
impl ast::PrefixExpr {
pub fn op_kind(&self) -> Option<PrefixOp> {
match self.op_token()?.kind() {
T![*] => Some(PrefixOp::Deref),
T![!] => Some(PrefixOp::Not),
T![-] => Some(PrefixOp::Neg),
_ => None,
}
}
pub fn op_token(&self) -> Option<SyntaxToken> {
self.syntax().first_child_or_token()?.into_token()
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum BinOp {
/// The `||` operator for boolean OR
BooleanOr,
/// The `&&` operator for boolean AND
BooleanAnd,
/// The `==` operator for equality testing
EqualityTest,
/// The `!=` operator for equality testing
NegatedEqualityTest,
/// The `<=` operator for lesser-equal testing
LesserEqualTest,
/// The `>=` operator for greater-equal testing
GreaterEqualTest,
/// The `<` operator for comparison
LesserTest,
/// The `>` operator for comparison
GreaterTest,
/// The `+` operator for addition
Addition,
/// The `*` operator for multiplication
Multiplication,
/// The `-` operator for subtraction
Subtraction,
/// The `/` operator for division
Division,
/// The `%` operator for remainder after division
Remainder,
/// The `<<` operator for left shift
LeftShift,
/// The `>>` operator for right shift
RightShift,
/// The `^` operator for bitwise XOR
BitwiseXor,
/// The `|` operator for bitwise OR
BitwiseOr,
/// The `&` operator for bitwise AND
BitwiseAnd,
/// The `=` operator for assignment
Assignment,
/// The `+=` operator for assignment after addition
AddAssign,
/// The `/=` operator for assignment after division
DivAssign,
/// The `*=` operator for assignment after multiplication
MulAssign,
/// The `%=` operator for assignment after remainders
RemAssign,
/// The `>>=` operator for assignment after shifting right
ShrAssign,
/// The `<<=` operator for assignment after shifting left
ShlAssign,
/// The `-=` operator for assignment after subtraction
SubAssign,
/// The `|=` operator for assignment after bitwise OR
BitOrAssign,
/// The `&=` operator for assignment after bitwise AND
BitAndAssign,
/// The `^=` operator for assignment after bitwise XOR
BitXorAssign,
}
impl BinOp {
pub fn is_assignment(self) -> bool {
match self {
BinOp::Assignment
| BinOp::AddAssign
| BinOp::DivAssign
| BinOp::MulAssign
| BinOp::RemAssign
| BinOp::ShrAssign
| BinOp::ShlAssign
| BinOp::SubAssign
| BinOp::BitOrAssign
| BinOp::BitAndAssign
| BinOp::BitXorAssign => true,
_ => false,
}
}
}
impl ast::BinExpr {
pub fn op_details(&self) -> Option<(SyntaxToken, BinOp)> {
self.syntax().children_with_tokens().filter_map(|it| it.into_token()).find_map(|c| {
let bin_op = match c.kind() {
T![||] => BinOp::BooleanOr,
T![&&] => BinOp::BooleanAnd,
T![==] => BinOp::EqualityTest,
T![!=] => BinOp::NegatedEqualityTest,
T![<=] => BinOp::LesserEqualTest,
T![>=] => BinOp::GreaterEqualTest,
T![<] => BinOp::LesserTest,
T![>] => BinOp::GreaterTest,
T![+] => BinOp::Addition,
T![*] => BinOp::Multiplication,
T![-] => BinOp::Subtraction,
T![/] => BinOp::Division,
T![%] => BinOp::Remainder,
T![<<] => BinOp::LeftShift,
T![>>] => BinOp::RightShift,
T![^] => BinOp::BitwiseXor,
T![|] => BinOp::BitwiseOr,
T![&] => BinOp::BitwiseAnd,
T![=] => BinOp::Assignment,
T![+=] => BinOp::AddAssign,
T![/=] => BinOp::DivAssign,
T![*=] => BinOp::MulAssign,
T![%=] => BinOp::RemAssign,
T![>>=] => BinOp::ShrAssign,
T![<<=] => BinOp::ShlAssign,
T![-=] => BinOp::SubAssign,
T![|=] => BinOp::BitOrAssign,
T![&=] => BinOp::BitAndAssign,
T![^=] => BinOp::BitXorAssign,
_ => return None,
};
Some((c, bin_op))
})
}
pub fn op_kind(&self) -> Option<BinOp> {
self.op_details().map(|t| t.1)
}
pub fn op_token(&self) -> Option<SyntaxToken> {
self.op_details().map(|t| t.0)
}
pub fn lhs(&self) -> Option<ast::Expr> {
support::children(self.syntax()).next()
}
pub fn rhs(&self) -> Option<ast::Expr> {
support::children(self.syntax()).nth(1)
}
pub fn sub_exprs(&self) -> (Option<ast::Expr>, Option<ast::Expr>) {
let mut children = support::children(self.syntax());
let first = children.next();
let second = children.next();
(first, second)
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum RangeOp {
/// `..`
Exclusive,
/// `..=`
Inclusive,
}
impl ast::RangeExpr {
fn op_details(&self) -> Option<(usize, SyntaxToken, RangeOp)> {
self.syntax().children_with_tokens().enumerate().find_map(|(ix, child)| {
let token = child.into_token()?;
let bin_op = match token.kind() {
T![..] => RangeOp::Exclusive,
T![..=] => RangeOp::Inclusive,
_ => return None,
};
Some((ix, token, bin_op))
})
}
pub fn op_kind(&self) -> Option<RangeOp> {
self.op_details().map(|t| t.2)
}
pub fn op_token(&self) -> Option<SyntaxToken> {
self.op_details().map(|t| t.1)
}
pub fn start(&self) -> Option<ast::Expr> {
let op_ix = self.op_details()?.0;
self.syntax()
.children_with_tokens()
.take(op_ix)
.find_map(|it| ast::Expr::cast(it.into_node()?))
}
pub fn end(&self) -> Option<ast::Expr> {
let op_ix = self.op_details()?.0;
self.syntax()
.children_with_tokens()
.skip(op_ix + 1)
.find_map(|it| ast::Expr::cast(it.into_node()?))
}
}
impl ast::IndexExpr {
pub fn base(&self) -> Option<ast::Expr> {
support::children(self.syntax()).next()
}
pub fn index(&self) -> Option<ast::Expr> {
support::children(self.syntax()).nth(1)
}
}
pub enum ArrayExprKind {
Repeat { initializer: Option<ast::Expr>, repeat: Option<ast::Expr> },
ElementList(AstChildren<ast::Expr>),
}
impl ast::ArrayExpr {
pub fn kind(&self) -> ArrayExprKind {
if self.is_repeat() {
ArrayExprKind::Repeat {
initializer: support::children(self.syntax()).next(),
repeat: support::children(self.syntax()).nth(1),
}
} else {
ArrayExprKind::ElementList(support::children(self.syntax()))
}
}
fn is_repeat(&self) -> bool {
self.syntax().children_with_tokens().any(|it| it.kind() == T![;])
}
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum LiteralKind {
String,
ByteString,
Char,
Byte,
IntNumber { suffix: Option<SmolStr> },
FloatNumber { suffix: Option<SmolStr> },
Bool(bool),
}
impl ast::Literal {
pub fn token(&self) -> SyntaxToken {
self.syntax()
.children_with_tokens()
.find(|e| e.kind() != ATTR && !e.kind().is_trivia())
.and_then(|e| e.into_token())
.unwrap()
}
fn find_suffix(text: &str, possible_suffixes: &[&str]) -> Option<SmolStr> {
possible_suffixes
.iter()
.find(|&suffix| text.ends_with(suffix))
.map(|&suffix| SmolStr::new(suffix))
}
pub fn kind(&self) -> LiteralKind {
const INT_SUFFIXES: [&str; 12] = [
"u64", "u32", "u16", "u8", "usize", "isize", "i64", "i32", "i16", "i8", "u128", "i128",
];
const FLOAT_SUFFIXES: [&str; 2] = ["f32", "f64"];
let token = self.token();
match token.kind() {
INT_NUMBER => {
// FYI: there was a bug here previously, thus an if statement bellow is necessary.
// The lexer treats e.g. `1f64` as an integer literal. See
// https://github.com/rust-analyzer/rust-analyzer/issues/1592
// and the comments on the linked PR.
let text = token.text();
if let suffix @ Some(_) = Self::find_suffix(&text, &FLOAT_SUFFIXES) {
LiteralKind::FloatNumber { suffix }
} else {
LiteralKind::IntNumber { suffix: Self::find_suffix(&text, &INT_SUFFIXES) }
}
}
FLOAT_NUMBER => {
let text = token.text();
LiteralKind::FloatNumber { suffix: Self::find_suffix(&text, &FLOAT_SUFFIXES) }
}
STRING | RAW_STRING => LiteralKind::String,
T![true] => LiteralKind::Bool(true),
T![false] => LiteralKind::Bool(false),
BYTE_STRING | RAW_BYTE_STRING => LiteralKind::ByteString,
CHAR => LiteralKind::Char,
BYTE => LiteralKind::Byte,
_ => unreachable!(),
}
}
}
impl ast::BlockExpr {
/// false if the block is an intrinsic part of the syntax and can't be
/// replaced with arbitrary expression.
///
/// ```not_rust
/// fn foo() { not_stand_alone }
/// const FOO: () = { stand_alone };
/// ```
pub fn is_standalone(&self) -> bool {
let kind = match self.syntax().parent() {
None => return true,
Some(it) => it.kind(),
};
match kind {
FN_DEF | MATCH_ARM | IF_EXPR | WHILE_EXPR | LOOP_EXPR | TRY_BLOCK_EXPR => false,
_ => true,
}
}
}
#[test]
fn test_literal_with_attr() {
let parse = ast::SourceFile::parse(r#"const _: &str = { #[attr] "Hello" };"#);
let lit = parse.tree().syntax().descendants().find_map(ast::Literal::cast).unwrap();
assert_eq!(lit.token().text(), r#""Hello""#);
}
impl ast::RecordField {
pub fn parent_record_lit(&self) -> ast::RecordLit {
self.syntax().ancestors().find_map(ast::RecordLit::cast).unwrap()
}
}
|