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//! Various extension methods to ast Expr Nodes, which are hard to code-generate.
use crate::{
SyntaxToken, SyntaxElement, SmolStr,
ast::{self, AstNode, AstChildren, children, child_opt},
SyntaxKind::*
};
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ElseBranch<'a> {
Block(&'a ast::Block),
IfExpr(&'a ast::IfExpr),
}
impl ast::IfExpr {
pub fn then_branch(&self) -> Option<&ast::Block> {
self.blocks().nth(0)
}
pub fn else_branch(&self) -> Option<ElseBranch> {
let res = match self.blocks().nth(1) {
Some(block) => ElseBranch::Block(block),
None => {
let elif: &ast::IfExpr = child_opt(self)?;
ElseBranch::IfExpr(elif)
}
};
Some(res)
}
fn blocks(&self) -> AstChildren<ast::Block> {
children(self)
}
}
impl ast::RefExpr {
pub fn is_mut(&self) -> bool {
self.syntax().children_with_tokens().any(|n| n.kind() == MUT_KW)
}
}
#[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() {
STAR => Some(PrefixOp::Deref),
EXCL => Some(PrefixOp::Not),
MINUS => Some(PrefixOp::Neg),
_ => None,
}
}
pub fn op_token(&self) -> Option<SyntaxToken> {
self.syntax().first_child_or_token()?.as_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 right-open ranges
RangeRightOpen,
/// The `..=` operator for right-closed ranges
RangeRightClosed,
/// 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 ast::BinExpr {
fn op_details(&self) -> Option<(SyntaxToken, BinOp)> {
self.syntax().children_with_tokens().filter_map(|it| it.as_token()).find_map(|c| {
match c.kind() {
PIPEPIPE => Some((c, BinOp::BooleanOr)),
AMPAMP => Some((c, BinOp::BooleanAnd)),
EQEQ => Some((c, BinOp::EqualityTest)),
NEQ => Some((c, BinOp::NegatedEqualityTest)),
LTEQ => Some((c, BinOp::LesserEqualTest)),
GTEQ => Some((c, BinOp::GreaterEqualTest)),
L_ANGLE => Some((c, BinOp::LesserTest)),
R_ANGLE => Some((c, BinOp::GreaterTest)),
PLUS => Some((c, BinOp::Addition)),
STAR => Some((c, BinOp::Multiplication)),
MINUS => Some((c, BinOp::Subtraction)),
SLASH => Some((c, BinOp::Division)),
PERCENT => Some((c, BinOp::Remainder)),
SHL => Some((c, BinOp::LeftShift)),
SHR => Some((c, BinOp::RightShift)),
CARET => Some((c, BinOp::BitwiseXor)),
PIPE => Some((c, BinOp::BitwiseOr)),
AMP => Some((c, BinOp::BitwiseAnd)),
DOTDOT => Some((c, BinOp::RangeRightOpen)),
DOTDOTEQ => Some((c, BinOp::RangeRightClosed)),
EQ => Some((c, BinOp::Assignment)),
PLUSEQ => Some((c, BinOp::AddAssign)),
SLASHEQ => Some((c, BinOp::DivAssign)),
STAREQ => Some((c, BinOp::MulAssign)),
PERCENTEQ => Some((c, BinOp::RemAssign)),
SHREQ => Some((c, BinOp::ShrAssign)),
SHLEQ => Some((c, BinOp::ShlAssign)),
MINUSEQ => Some((c, BinOp::SubAssign)),
PIPEEQ => Some((c, BinOp::BitOrAssign)),
AMPEQ => Some((c, BinOp::BitAndAssign)),
CARETEQ => Some((c, BinOp::BitXorAssign)),
_ => None,
}
})
}
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> {
children(self).nth(0)
}
pub fn rhs(&self) -> Option<&ast::Expr> {
children(self).nth(1)
}
pub fn sub_exprs(&self) -> (Option<&ast::Expr>, Option<&ast::Expr>) {
let mut children = children(self);
let first = children.next();
let second = children.next();
(first, second)
}
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum LiteralKind {
String,
ByteString,
Char,
Byte,
IntNumber { suffix: Option<SmolStr> },
FloatNumber { suffix: Option<SmolStr> },
Bool,
}
impl ast::Literal {
pub fn token(&self) -> SyntaxToken {
match self.syntax().first_child_or_token().unwrap() {
SyntaxElement::Token(token) => token,
_ => unreachable!(),
}
}
pub fn kind(&self) -> LiteralKind {
match self.token().kind() {
INT_NUMBER => {
let allowed_suffix_list = [
"isize", "i128", "i64", "i32", "i16", "i8", "usize", "u128", "u64", "u32",
"u16", "u8",
];
let text = self.token().text().to_string();
let suffix = allowed_suffix_list
.iter()
.find(|&s| text.ends_with(s))
.map(|&suf| SmolStr::new(suf));
LiteralKind::IntNumber { suffix }
}
FLOAT_NUMBER => {
let allowed_suffix_list = ["f64", "f32"];
let text = self.token().text().to_string();
let suffix = allowed_suffix_list
.iter()
.find(|&s| text.ends_with(s))
.map(|&suf| SmolStr::new(suf));
LiteralKind::FloatNumber { suffix: suffix }
}
STRING | RAW_STRING => LiteralKind::String,
TRUE_KW | FALSE_KW => LiteralKind::Bool,
BYTE_STRING | RAW_BYTE_STRING => LiteralKind::ByteString,
CHAR => LiteralKind::Char,
BYTE => LiteralKind::Byte,
_ => unreachable!(),
}
}
}
impl ast::NamedField {
pub fn parent_struct_lit(&self) -> &ast::StructLit {
self.syntax().ancestors().find_map(ast::StructLit::cast).unwrap()
}
}
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