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|
mod generated;
use std::marker::PhantomData;
use itertools::Itertools;
pub use self::generated::*;
use crate::{
yellow::{SyntaxNode, SyntaxNodeChildren, TreeArc, RaTypes},
SmolStr,
SyntaxKind::*,
};
/// The main trait to go from untyped `SyntaxNode` to a typed ast. The
/// conversion itself has zero runtime cost: ast and syntax nodes have exactly
/// the same representation: a pointer to the tree root and a pointer to the
/// node itself.
pub trait AstNode:
rowan::TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>> + ToOwned<Owned = TreeArc<Self>>
{
fn cast(syntax: &SyntaxNode) -> Option<&Self>
where
Self: Sized;
fn syntax(&self) -> &SyntaxNode;
}
pub trait AstToken: AstNode {
fn text(&self) -> &SmolStr {
self.syntax().leaf_text().unwrap()
}
}
pub trait NameOwner: AstNode {
fn name(&self) -> Option<&Name> {
child_opt(self)
}
}
pub trait VisibilityOwner: AstNode {
fn visibility(&self) -> Option<&Visibility> {
child_opt(self)
}
}
pub trait LoopBodyOwner: AstNode {
fn loop_body(&self) -> Option<&Block> {
child_opt(self)
}
}
pub trait ArgListOwner: AstNode {
fn arg_list(&self) -> Option<&ArgList> {
child_opt(self)
}
}
pub trait FnDefOwner: AstNode {
fn functions(&self) -> AstChildren<FnDef> {
children(self)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ItemOrMacro<'a> {
Item(&'a ModuleItem),
Macro(&'a MacroCall),
}
pub trait ModuleItemOwner: AstNode {
fn items(&self) -> AstChildren<ModuleItem> {
children(self)
}
fn items_with_macros(&self) -> ItemOrMacroIter {
ItemOrMacroIter(self.syntax().children())
}
}
#[derive(Debug)]
pub struct ItemOrMacroIter<'a>(SyntaxNodeChildren<'a>);
impl<'a> Iterator for ItemOrMacroIter<'a> {
type Item = ItemOrMacro<'a>;
fn next(&mut self) -> Option<ItemOrMacro<'a>> {
loop {
let n = self.0.next()?;
if let Some(item) = ModuleItem::cast(n) {
return Some(ItemOrMacro::Item(item));
}
if let Some(call) = MacroCall::cast(n) {
return Some(ItemOrMacro::Macro(call));
}
}
}
}
pub trait TypeParamsOwner: AstNode {
fn type_param_list(&self) -> Option<&TypeParamList> {
child_opt(self)
}
fn where_clause(&self) -> Option<&WhereClause> {
child_opt(self)
}
}
pub trait AttrsOwner: AstNode {
fn attrs(&self) -> AstChildren<Attr> {
children(self)
}
}
pub trait DocCommentsOwner: AstNode {
fn doc_comments(&self) -> AstChildren<Comment> {
children(self)
}
/// Returns the textual content of a doc comment block as a single string.
/// That is, strips leading `///` and joins lines
fn doc_comment_text(&self) -> std::string::String {
self.doc_comments()
.filter(|comment| comment.is_doc_comment())
.map(|comment| {
let prefix = comment.prefix();
let trimmed = comment
.text()
.as_str()
.trim()
.trim_start_matches(prefix)
.trim_start();
trimmed.to_owned()
})
.join("\n")
}
}
impl FnDef {
pub fn has_atom_attr(&self, atom: &str) -> bool {
self.attrs().filter_map(|x| x.as_atom()).any(|x| x == atom)
}
}
impl Attr {
pub fn as_atom(&self) -> Option<SmolStr> {
let tt = self.value()?;
let (_bra, attr, _ket) = tt.syntax().children().collect_tuple()?;
if attr.kind() == IDENT {
Some(attr.leaf_text().unwrap().clone())
} else {
None
}
}
pub fn as_call(&self) -> Option<(SmolStr, &TokenTree)> {
let tt = self.value()?;
let (_bra, attr, args, _ket) = tt.syntax().children().collect_tuple()?;
let args = TokenTree::cast(args)?;
if attr.kind() == IDENT {
Some((attr.leaf_text().unwrap().clone(), args))
} else {
None
}
}
}
impl Comment {
pub fn flavor(&self) -> CommentFlavor {
let text = self.text();
if text.starts_with("///") {
CommentFlavor::Doc
} else if text.starts_with("//!") {
CommentFlavor::ModuleDoc
} else if text.starts_with("//") {
CommentFlavor::Line
} else {
CommentFlavor::Multiline
}
}
pub fn is_doc_comment(&self) -> bool {
self.flavor().is_doc_comment()
}
pub fn prefix(&self) -> &'static str {
self.flavor().prefix()
}
pub fn count_newlines_lazy(&self) -> impl Iterator<Item = &()> {
self.text().chars().filter(|&c| c == '\n').map(|_| &())
}
pub fn has_newlines(&self) -> bool {
self.count_newlines_lazy().count() > 0
}
}
#[derive(Debug, PartialEq, Eq)]
pub enum CommentFlavor {
Line,
Doc,
ModuleDoc,
Multiline,
}
impl CommentFlavor {
pub fn prefix(&self) -> &'static str {
use self::CommentFlavor::*;
match *self {
Line => "//",
Doc => "///",
ModuleDoc => "//!",
Multiline => "/*",
}
}
pub fn is_doc_comment(&self) -> bool {
match self {
CommentFlavor::Doc | CommentFlavor::ModuleDoc => true,
_ => false,
}
}
}
impl Whitespace {
pub fn count_newlines_lazy(&self) -> impl Iterator<Item = &()> {
self.text().chars().filter(|&c| c == '\n').map(|_| &())
}
pub fn has_newlines(&self) -> bool {
self.text().contains('\n')
}
}
impl Name {
pub fn text(&self) -> &SmolStr {
let ident = self.syntax().first_child().unwrap();
ident.leaf_text().unwrap()
}
}
impl NameRef {
pub fn text(&self) -> &SmolStr {
let ident = self.syntax().first_child().unwrap();
ident.leaf_text().unwrap()
}
}
impl ImplBlock {
pub fn target_type(&self) -> Option<&TypeRef> {
match self.target() {
(Some(t), None) | (_, Some(t)) => Some(t),
_ => None,
}
}
pub fn target_trait(&self) -> Option<&TypeRef> {
match self.target() {
(Some(t), Some(_)) => Some(t),
_ => None,
}
}
fn target(&self) -> (Option<&TypeRef>, Option<&TypeRef>) {
let mut types = children(self);
let first = types.next();
let second = types.next();
(first, second)
}
}
impl Module {
pub fn has_semi(&self) -> bool {
match self.syntax().last_child() {
None => false,
Some(node) => node.kind() == SEMI,
}
}
}
impl LetStmt {
pub fn has_semi(&self) -> bool {
match self.syntax().last_child() {
None => false,
Some(node) => node.kind() == SEMI,
}
}
}
impl IfExpr {
pub fn then_branch(&self) -> Option<&Block> {
self.blocks().nth(0)
}
pub fn else_branch(&self) -> Option<&Block> {
self.blocks().nth(1)
}
fn blocks(&self) -> AstChildren<Block> {
children(self)
}
}
impl ExprStmt {
pub fn has_semi(&self) -> bool {
match self.syntax().last_child() {
None => false,
Some(node) => node.kind() == SEMI,
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum PathSegmentKind<'a> {
Name(&'a NameRef),
SelfKw,
SuperKw,
CrateKw,
}
impl PathSegment {
pub fn parent_path(&self) -> &Path {
self.syntax()
.parent()
.and_then(Path::cast)
.expect("segments are always nested in paths")
}
pub fn kind(&self) -> Option<PathSegmentKind> {
let res = if let Some(name_ref) = self.name_ref() {
PathSegmentKind::Name(name_ref)
} else {
match self.syntax().first_child()?.kind() {
SELF_KW => PathSegmentKind::SelfKw,
SUPER_KW => PathSegmentKind::SuperKw,
CRATE_KW => PathSegmentKind::CrateKw,
_ => return None,
}
};
Some(res)
}
pub fn has_colon_colon(&self) -> bool {
match self.syntax.first_child().map(|s| s.kind()) {
Some(COLONCOLON) => true,
_ => false,
}
}
}
impl Path {
pub fn parent_path(&self) -> Option<&Path> {
self.syntax().parent().and_then(Path::cast)
}
}
impl UseTree {
pub fn has_star(&self) -> bool {
self.syntax().children().any(|it| it.kind() == STAR)
}
}
impl UseTreeList {
pub fn parent_use_tree(&self) -> &UseTree {
self.syntax()
.parent()
.and_then(UseTree::cast)
.expect("UseTreeLists are always nested in UseTrees")
}
}
impl RefPat {
pub fn is_mut(&self) -> bool {
self.syntax().children().any(|n| n.kind() == MUT_KW)
}
}
fn child_opt<P: AstNode, C: AstNode>(parent: &P) -> Option<&C> {
children(parent).next()
}
fn children<P: AstNode, C: AstNode>(parent: &P) -> AstChildren<C> {
AstChildren::new(parent.syntax())
}
#[derive(Debug)]
pub struct AstChildren<'a, N> {
inner: SyntaxNodeChildren<'a>,
ph: PhantomData<N>,
}
impl<'a, N> AstChildren<'a, N> {
fn new(parent: &'a SyntaxNode) -> Self {
AstChildren {
inner: parent.children(),
ph: PhantomData,
}
}
}
impl<'a, N: AstNode + 'a> Iterator for AstChildren<'a, N> {
type Item = &'a N;
fn next(&mut self) -> Option<&'a N> {
loop {
if let Some(n) = N::cast(self.inner.next()?) {
return Some(n);
}
}
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum StructFlavor<'a> {
Tuple(&'a PosFieldList),
Named(&'a NamedFieldDefList),
Unit,
}
impl StructFlavor<'_> {
fn from_node<N: AstNode>(node: &N) -> StructFlavor {
if let Some(nfdl) = child_opt::<_, NamedFieldDefList>(node) {
StructFlavor::Named(nfdl)
} else if let Some(pfl) = child_opt::<_, PosFieldList>(node) {
StructFlavor::Tuple(pfl)
} else {
StructFlavor::Unit
}
}
}
impl StructDef {
pub fn flavor(&self) -> StructFlavor {
StructFlavor::from_node(self)
}
}
impl EnumVariant {
pub fn flavor(&self) -> StructFlavor {
StructFlavor::from_node(self)
}
}
impl PointerType {
pub fn is_mut(&self) -> bool {
self.syntax().children().any(|n| n.kind() == MUT_KW)
}
}
impl ReferenceType {
pub fn is_mut(&self) -> bool {
self.syntax().children().any(|n| n.kind() == MUT_KW)
}
}
impl RefExpr {
pub fn is_mut(&self) -> bool {
self.syntax().children().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 PrefixExpr {
pub fn op(&self) -> Option<PrefixOp> {
match self.syntax().first_child()?.kind() {
STAR => Some(PrefixOp::Deref),
EXCL => Some(PrefixOp::Not),
MINUS => Some(PrefixOp::Neg),
_ => None,
}
}
}
#[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 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 additon
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 BinExpr {
pub fn op(&self) -> Option<BinOp> {
self.syntax()
.children()
.filter_map(|c| match c.kind() {
PIPEPIPE => Some(BinOp::BooleanOr),
AMPAMP => Some(BinOp::BooleanAnd),
EQEQ => Some(BinOp::EqualityTest),
LTEQ => Some(BinOp::LesserEqualTest),
GTEQ => Some(BinOp::GreaterEqualTest),
L_ANGLE => Some(BinOp::LesserTest),
R_ANGLE => Some(BinOp::GreaterTest),
PLUS => Some(BinOp::Addition),
STAR => Some(BinOp::Multiplication),
MINUS => Some(BinOp::Subtraction),
SLASH => Some(BinOp::Division),
PERCENT => Some(BinOp::Remainder),
SHL => Some(BinOp::LeftShift),
SHR => Some(BinOp::RightShift),
CARET => Some(BinOp::BitwiseXor),
PIPE => Some(BinOp::BitwiseOr),
AMP => Some(BinOp::BitwiseAnd),
DOTDOT => Some(BinOp::RangeRightOpen),
DOTDOTEQ => Some(BinOp::RangeRightClosed),
EQ => Some(BinOp::Assignment),
PLUSEQ => Some(BinOp::AddAssign),
SLASHEQ => Some(BinOp::DivAssign),
STAREQ => Some(BinOp::MulAssign),
PERCENTEQ => Some(BinOp::RemAssign),
SHREQ => Some(BinOp::ShrAssign),
SHLEQ => Some(BinOp::ShlAssign),
MINUSEQ => Some(BinOp::SubAssign),
PIPEEQ => Some(BinOp::BitOrAssign),
AMPEQ => Some(BinOp::BitAndAssign),
CARETEQ => Some(BinOp::BitXorAssign),
_ => None,
})
.next()
}
pub fn lhs(&self) -> Option<&Expr> {
children(self).nth(0)
}
pub fn rhs(&self) -> Option<&Expr> {
children(self).nth(1)
}
pub fn sub_exprs(&self) -> (Option<&Expr>, Option<&Expr>) {
let mut children = children(self);
let first = children.next();
let second = children.next();
(first, second)
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum SelfParamFlavor {
/// self
Owned,
/// &self
Ref,
/// &mut self
MutRef,
}
impl SelfParam {
pub fn flavor(&self) -> SelfParamFlavor {
let borrowed = self.syntax().children().any(|n| n.kind() == AMP);
if borrowed {
// check for a `mut` coming after the & -- `mut &self` != `&mut self`
if self
.syntax()
.children()
.skip_while(|n| n.kind() != AMP)
.any(|n| n.kind() == MUT_KW)
{
SelfParamFlavor::MutRef
} else {
SelfParamFlavor::Ref
}
} else {
SelfParamFlavor::Owned
}
}
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum LiteralFlavor {
String,
ByteString,
Char,
Byte,
IntNumber { suffix: Option<SmolStr> },
FloatNumber { suffix: Option<SmolStr> },
Bool,
}
impl LiteralExpr {
pub fn flavor(&self) -> LiteralFlavor {
let syntax = self.syntax();
match syntax.kind() {
INT_NUMBER => {
let allowed_suffix_list = [
"isize", "i128", "i64", "i32", "i16", "i8", "usize", "u128", "u64", "u32",
"u16", "u8",
];
let text = syntax.text().to_string();
let suffix = allowed_suffix_list
.iter()
.find(|&s| text.ends_with(s))
.map(|&suf| SmolStr::new(suf));
LiteralFlavor::IntNumber { suffix: suffix }
}
FLOAT_NUMBER => {
let allowed_suffix_list = ["f64", "f32"];
let text = syntax.text().to_string();
let suffix = allowed_suffix_list
.iter()
.find(|&s| text.ends_with(s))
.map(|&suf| SmolStr::new(suf));
LiteralFlavor::FloatNumber { suffix: suffix }
}
STRING | RAW_STRING => LiteralFlavor::String,
TRUE_KW | FALSE_KW => LiteralFlavor::Bool,
BYTE_STRING | RAW_BYTE_STRING => LiteralFlavor::ByteString,
CHAR => LiteralFlavor::Char,
BYTE => LiteralFlavor::Byte,
_ => unreachable!(),
}
}
}
impl BindPat {
pub fn is_mutable(&self) -> bool {
self.syntax().children().any(|n| n.kind() == MUT_KW)
}
pub fn is_ref(&self) -> bool {
self.syntax().children().any(|n| n.kind() == REF_KW)
}
}
#[test]
fn test_doc_comment_of_items() {
let file = SourceFile::parse(
r#"
//! doc
// non-doc
mod foo {}
"#,
);
let module = file.syntax().descendants().find_map(Module::cast).unwrap();
assert_eq!("doc", module.doc_comment_text());
}
|