Rename ra_mbe -> mbe
This commit is contained in:
Aleksey Kladov
832
crates/mbe/src/syntax_bridge.rs
Normal file
832
crates/mbe/src/syntax_bridge.rs
Normal file
@@ -0,0 +1,832 @@
|
||||
//! FIXME: write short doc here
|
||||
|
||||
use parser::{FragmentKind, ParseError, TreeSink};
|
||||
use rustc_hash::FxHashMap;
|
||||
use syntax::{
|
||||
ast::{self, make::tokens::doc_comment},
|
||||
tokenize, AstToken, Parse, SmolStr, SyntaxKind,
|
||||
SyntaxKind::*,
|
||||
SyntaxNode, SyntaxToken, SyntaxTreeBuilder, TextRange, TextSize, Token as RawToken, T,
|
||||
};
|
||||
use tt::buffer::{Cursor, TokenBuffer};
|
||||
|
||||
use crate::subtree_source::SubtreeTokenSource;
|
||||
use crate::ExpandError;
|
||||
|
||||
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
|
||||
pub enum TokenTextRange {
|
||||
Token(TextRange),
|
||||
Delimiter(TextRange, TextRange),
|
||||
}
|
||||
|
||||
impl TokenTextRange {
|
||||
pub fn by_kind(self, kind: SyntaxKind) -> Option<TextRange> {
|
||||
match self {
|
||||
TokenTextRange::Token(it) => Some(it),
|
||||
TokenTextRange::Delimiter(open, close) => match kind {
|
||||
T!['{'] | T!['('] | T!['['] => Some(open),
|
||||
T!['}'] | T![')'] | T![']'] => Some(close),
|
||||
_ => None,
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Maps `tt::TokenId` to the relative range of the original token.
|
||||
#[derive(Debug, PartialEq, Eq, Clone, Default)]
|
||||
pub struct TokenMap {
|
||||
/// Maps `tt::TokenId` to the *relative* source range.
|
||||
entries: Vec<(tt::TokenId, TokenTextRange)>,
|
||||
}
|
||||
|
||||
/// Convert the syntax tree (what user has written) to a `TokenTree` (what macro
|
||||
/// will consume).
|
||||
pub fn ast_to_token_tree(ast: &impl ast::AstNode) -> Option<(tt::Subtree, TokenMap)> {
|
||||
syntax_node_to_token_tree(ast.syntax())
|
||||
}
|
||||
|
||||
/// Convert the syntax node to a `TokenTree` (what macro
|
||||
/// will consume).
|
||||
pub fn syntax_node_to_token_tree(node: &SyntaxNode) -> Option<(tt::Subtree, TokenMap)> {
|
||||
let global_offset = node.text_range().start();
|
||||
let mut c = Convertor::new(node, global_offset);
|
||||
let subtree = c.go()?;
|
||||
Some((subtree, c.id_alloc.map))
|
||||
}
|
||||
|
||||
// The following items are what `rustc` macro can be parsed into :
|
||||
// link: https://github.com/rust-lang/rust/blob/9ebf47851a357faa4cd97f4b1dc7835f6376e639/src/libsyntax/ext/expand.rs#L141
|
||||
// * Expr(P<ast::Expr>) -> token_tree_to_expr
|
||||
// * Pat(P<ast::Pat>) -> token_tree_to_pat
|
||||
// * Ty(P<ast::Ty>) -> token_tree_to_ty
|
||||
// * Stmts(SmallVec<[ast::Stmt; 1]>) -> token_tree_to_stmts
|
||||
// * Items(SmallVec<[P<ast::Item>; 1]>) -> token_tree_to_items
|
||||
//
|
||||
// * TraitItems(SmallVec<[ast::TraitItem; 1]>)
|
||||
// * AssocItems(SmallVec<[ast::AssocItem; 1]>)
|
||||
// * ForeignItems(SmallVec<[ast::ForeignItem; 1]>
|
||||
|
||||
pub fn token_tree_to_syntax_node(
|
||||
tt: &tt::Subtree,
|
||||
fragment_kind: FragmentKind,
|
||||
) -> Result<(Parse<SyntaxNode>, TokenMap), ExpandError> {
|
||||
let tmp;
|
||||
let tokens = match tt {
|
||||
tt::Subtree { delimiter: None, token_trees } => token_trees.as_slice(),
|
||||
_ => {
|
||||
tmp = [tt.clone().into()];
|
||||
&tmp[..]
|
||||
}
|
||||
};
|
||||
let buffer = TokenBuffer::new(&tokens);
|
||||
let mut token_source = SubtreeTokenSource::new(&buffer);
|
||||
let mut tree_sink = TtTreeSink::new(buffer.begin());
|
||||
parser::parse_fragment(&mut token_source, &mut tree_sink, fragment_kind);
|
||||
if tree_sink.roots.len() != 1 {
|
||||
return Err(ExpandError::ConversionError);
|
||||
}
|
||||
//FIXME: would be cool to report errors
|
||||
let (parse, range_map) = tree_sink.finish();
|
||||
Ok((parse, range_map))
|
||||
}
|
||||
|
||||
/// Convert a string to a `TokenTree`
|
||||
pub fn parse_to_token_tree(text: &str) -> Option<(tt::Subtree, TokenMap)> {
|
||||
let (tokens, errors) = tokenize(text);
|
||||
if !errors.is_empty() {
|
||||
return None;
|
||||
}
|
||||
|
||||
let mut conv = RawConvertor {
|
||||
text,
|
||||
offset: TextSize::default(),
|
||||
inner: tokens.iter(),
|
||||
id_alloc: TokenIdAlloc {
|
||||
map: Default::default(),
|
||||
global_offset: TextSize::default(),
|
||||
next_id: 0,
|
||||
},
|
||||
};
|
||||
|
||||
let subtree = conv.go()?;
|
||||
Some((subtree, conv.id_alloc.map))
|
||||
}
|
||||
|
||||
impl TokenMap {
|
||||
pub fn token_by_range(&self, relative_range: TextRange) -> Option<tt::TokenId> {
|
||||
let &(token_id, _) = self.entries.iter().find(|(_, range)| match range {
|
||||
TokenTextRange::Token(it) => *it == relative_range,
|
||||
TokenTextRange::Delimiter(open, close) => {
|
||||
*open == relative_range || *close == relative_range
|
||||
}
|
||||
})?;
|
||||
Some(token_id)
|
||||
}
|
||||
|
||||
pub fn range_by_token(&self, token_id: tt::TokenId) -> Option<TokenTextRange> {
|
||||
let &(_, range) = self.entries.iter().find(|(tid, _)| *tid == token_id)?;
|
||||
Some(range)
|
||||
}
|
||||
|
||||
fn insert(&mut self, token_id: tt::TokenId, relative_range: TextRange) {
|
||||
self.entries.push((token_id, TokenTextRange::Token(relative_range)));
|
||||
}
|
||||
|
||||
fn insert_delim(
|
||||
&mut self,
|
||||
token_id: tt::TokenId,
|
||||
open_relative_range: TextRange,
|
||||
close_relative_range: TextRange,
|
||||
) -> usize {
|
||||
let res = self.entries.len();
|
||||
self.entries
|
||||
.push((token_id, TokenTextRange::Delimiter(open_relative_range, close_relative_range)));
|
||||
res
|
||||
}
|
||||
|
||||
fn update_close_delim(&mut self, idx: usize, close_relative_range: TextRange) {
|
||||
let (_, token_text_range) = &mut self.entries[idx];
|
||||
if let TokenTextRange::Delimiter(dim, _) = token_text_range {
|
||||
*token_text_range = TokenTextRange::Delimiter(*dim, close_relative_range);
|
||||
}
|
||||
}
|
||||
|
||||
fn remove_delim(&mut self, idx: usize) {
|
||||
// FIXME: This could be accidently quadratic
|
||||
self.entries.remove(idx);
|
||||
}
|
||||
}
|
||||
|
||||
/// Returns the textual content of a doc comment block as a quoted string
|
||||
/// That is, strips leading `///` (or `/**`, etc)
|
||||
/// and strips the ending `*/`
|
||||
/// And then quote the string, which is needed to convert to `tt::Literal`
|
||||
fn doc_comment_text(comment: &ast::Comment) -> SmolStr {
|
||||
let prefix_len = comment.prefix().len();
|
||||
let mut text = &comment.text()[prefix_len..];
|
||||
|
||||
// Remove ending "*/"
|
||||
if comment.kind().shape == ast::CommentShape::Block {
|
||||
text = &text[0..text.len() - 2];
|
||||
}
|
||||
|
||||
// Quote the string
|
||||
// Note that `tt::Literal` expect an escaped string
|
||||
let text = format!("{:?}", text.escape_default().to_string());
|
||||
text.into()
|
||||
}
|
||||
|
||||
fn convert_doc_comment(token: &syntax::SyntaxToken) -> Option<Vec<tt::TokenTree>> {
|
||||
let comment = ast::Comment::cast(token.clone())?;
|
||||
let doc = comment.kind().doc?;
|
||||
|
||||
// Make `doc="\" Comments\""
|
||||
let mut meta_tkns = Vec::new();
|
||||
meta_tkns.push(mk_ident("doc"));
|
||||
meta_tkns.push(mk_punct('='));
|
||||
meta_tkns.push(mk_doc_literal(&comment));
|
||||
|
||||
// Make `#![]`
|
||||
let mut token_trees = Vec::new();
|
||||
token_trees.push(mk_punct('#'));
|
||||
if let ast::CommentPlacement::Inner = doc {
|
||||
token_trees.push(mk_punct('!'));
|
||||
}
|
||||
token_trees.push(tt::TokenTree::from(tt::Subtree {
|
||||
delimiter: Some(tt::Delimiter {
|
||||
kind: tt::DelimiterKind::Bracket,
|
||||
id: tt::TokenId::unspecified(),
|
||||
}),
|
||||
token_trees: meta_tkns,
|
||||
}));
|
||||
|
||||
return Some(token_trees);
|
||||
|
||||
// Helper functions
|
||||
fn mk_ident(s: &str) -> tt::TokenTree {
|
||||
tt::TokenTree::from(tt::Leaf::from(tt::Ident {
|
||||
text: s.into(),
|
||||
id: tt::TokenId::unspecified(),
|
||||
}))
|
||||
}
|
||||
|
||||
fn mk_punct(c: char) -> tt::TokenTree {
|
||||
tt::TokenTree::from(tt::Leaf::from(tt::Punct {
|
||||
char: c,
|
||||
spacing: tt::Spacing::Alone,
|
||||
id: tt::TokenId::unspecified(),
|
||||
}))
|
||||
}
|
||||
|
||||
fn mk_doc_literal(comment: &ast::Comment) -> tt::TokenTree {
|
||||
let lit = tt::Literal { text: doc_comment_text(comment), id: tt::TokenId::unspecified() };
|
||||
|
||||
tt::TokenTree::from(tt::Leaf::from(lit))
|
||||
}
|
||||
}
|
||||
|
||||
struct TokenIdAlloc {
|
||||
map: TokenMap,
|
||||
global_offset: TextSize,
|
||||
next_id: u32,
|
||||
}
|
||||
|
||||
impl TokenIdAlloc {
|
||||
fn alloc(&mut self, absolute_range: TextRange) -> tt::TokenId {
|
||||
let relative_range = absolute_range - self.global_offset;
|
||||
let token_id = tt::TokenId(self.next_id);
|
||||
self.next_id += 1;
|
||||
self.map.insert(token_id, relative_range);
|
||||
token_id
|
||||
}
|
||||
|
||||
fn open_delim(&mut self, open_abs_range: TextRange) -> (tt::TokenId, usize) {
|
||||
let token_id = tt::TokenId(self.next_id);
|
||||
self.next_id += 1;
|
||||
let idx = self.map.insert_delim(
|
||||
token_id,
|
||||
open_abs_range - self.global_offset,
|
||||
open_abs_range - self.global_offset,
|
||||
);
|
||||
(token_id, idx)
|
||||
}
|
||||
|
||||
fn close_delim(&mut self, idx: usize, close_abs_range: Option<TextRange>) {
|
||||
match close_abs_range {
|
||||
None => {
|
||||
self.map.remove_delim(idx);
|
||||
}
|
||||
Some(close) => {
|
||||
self.map.update_close_delim(idx, close - self.global_offset);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// A Raw Token (straightly from lexer) convertor
|
||||
struct RawConvertor<'a> {
|
||||
text: &'a str,
|
||||
offset: TextSize,
|
||||
id_alloc: TokenIdAlloc,
|
||||
inner: std::slice::Iter<'a, RawToken>,
|
||||
}
|
||||
|
||||
trait SrcToken: std::fmt::Debug {
|
||||
fn kind(&self) -> SyntaxKind;
|
||||
|
||||
fn to_char(&self) -> Option<char>;
|
||||
|
||||
fn to_text(&self) -> SmolStr;
|
||||
}
|
||||
|
||||
trait TokenConvertor {
|
||||
type Token: SrcToken;
|
||||
|
||||
fn go(&mut self) -> Option<tt::Subtree> {
|
||||
let mut subtree = tt::Subtree::default();
|
||||
subtree.delimiter = None;
|
||||
while self.peek().is_some() {
|
||||
self.collect_leaf(&mut subtree.token_trees);
|
||||
}
|
||||
if subtree.token_trees.is_empty() {
|
||||
return None;
|
||||
}
|
||||
if subtree.token_trees.len() == 1 {
|
||||
if let tt::TokenTree::Subtree(first) = &subtree.token_trees[0] {
|
||||
return Some(first.clone());
|
||||
}
|
||||
}
|
||||
Some(subtree)
|
||||
}
|
||||
|
||||
fn collect_leaf(&mut self, result: &mut Vec<tt::TokenTree>) {
|
||||
let (token, range) = match self.bump() {
|
||||
None => return,
|
||||
Some(it) => it,
|
||||
};
|
||||
|
||||
let k: SyntaxKind = token.kind();
|
||||
if k == COMMENT {
|
||||
if let Some(tokens) = self.convert_doc_comment(&token) {
|
||||
result.extend(tokens);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
result.push(if k.is_punct() {
|
||||
assert_eq!(range.len(), TextSize::of('.'));
|
||||
let delim = match k {
|
||||
T!['('] => Some((tt::DelimiterKind::Parenthesis, T![')'])),
|
||||
T!['{'] => Some((tt::DelimiterKind::Brace, T!['}'])),
|
||||
T!['['] => Some((tt::DelimiterKind::Bracket, T![']'])),
|
||||
_ => None,
|
||||
};
|
||||
|
||||
if let Some((kind, closed)) = delim {
|
||||
let mut subtree = tt::Subtree::default();
|
||||
let (id, idx) = self.id_alloc().open_delim(range);
|
||||
subtree.delimiter = Some(tt::Delimiter { kind, id });
|
||||
|
||||
while self.peek().map(|it| it.kind() != closed).unwrap_or(false) {
|
||||
self.collect_leaf(&mut subtree.token_trees);
|
||||
}
|
||||
let last_range = match self.bump() {
|
||||
None => {
|
||||
// For error resilience, we insert an char punct for the opening delim here
|
||||
self.id_alloc().close_delim(idx, None);
|
||||
let leaf: tt::Leaf = tt::Punct {
|
||||
id: self.id_alloc().alloc(range),
|
||||
char: token.to_char().unwrap(),
|
||||
spacing: tt::Spacing::Alone,
|
||||
}
|
||||
.into();
|
||||
result.push(leaf.into());
|
||||
result.extend(subtree.token_trees);
|
||||
return;
|
||||
}
|
||||
Some(it) => it.1,
|
||||
};
|
||||
self.id_alloc().close_delim(idx, Some(last_range));
|
||||
subtree.into()
|
||||
} else {
|
||||
let spacing = match self.peek() {
|
||||
Some(next)
|
||||
if next.kind().is_trivia()
|
||||
|| next.kind() == T!['[']
|
||||
|| next.kind() == T!['{']
|
||||
|| next.kind() == T!['('] =>
|
||||
{
|
||||
tt::Spacing::Alone
|
||||
}
|
||||
Some(next) if next.kind().is_punct() => tt::Spacing::Joint,
|
||||
_ => tt::Spacing::Alone,
|
||||
};
|
||||
let char = match token.to_char() {
|
||||
Some(c) => c,
|
||||
None => {
|
||||
panic!("Token from lexer must be single char: token = {:#?}", token);
|
||||
}
|
||||
};
|
||||
tt::Leaf::from(tt::Punct { char, spacing, id: self.id_alloc().alloc(range) }).into()
|
||||
}
|
||||
} else {
|
||||
macro_rules! make_leaf {
|
||||
($i:ident) => {
|
||||
tt::$i { id: self.id_alloc().alloc(range), text: token.to_text() }.into()
|
||||
};
|
||||
}
|
||||
let leaf: tt::Leaf = match k {
|
||||
T![true] | T![false] => make_leaf!(Ident),
|
||||
IDENT => make_leaf!(Ident),
|
||||
k if k.is_keyword() => make_leaf!(Ident),
|
||||
k if k.is_literal() => make_leaf!(Literal),
|
||||
LIFETIME => {
|
||||
let char_unit = TextSize::of('\'');
|
||||
let r = TextRange::at(range.start(), char_unit);
|
||||
let apostrophe = tt::Leaf::from(tt::Punct {
|
||||
char: '\'',
|
||||
spacing: tt::Spacing::Joint,
|
||||
id: self.id_alloc().alloc(r),
|
||||
});
|
||||
result.push(apostrophe.into());
|
||||
|
||||
let r = TextRange::at(range.start() + char_unit, range.len() - char_unit);
|
||||
let ident = tt::Leaf::from(tt::Ident {
|
||||
text: SmolStr::new(&token.to_text()[1..]),
|
||||
id: self.id_alloc().alloc(r),
|
||||
});
|
||||
result.push(ident.into());
|
||||
return;
|
||||
}
|
||||
_ => return,
|
||||
};
|
||||
|
||||
leaf.into()
|
||||
});
|
||||
}
|
||||
|
||||
fn convert_doc_comment(&self, token: &Self::Token) -> Option<Vec<tt::TokenTree>>;
|
||||
|
||||
fn bump(&mut self) -> Option<(Self::Token, TextRange)>;
|
||||
|
||||
fn peek(&self) -> Option<Self::Token>;
|
||||
|
||||
fn id_alloc(&mut self) -> &mut TokenIdAlloc;
|
||||
}
|
||||
|
||||
impl<'a> SrcToken for (RawToken, &'a str) {
|
||||
fn kind(&self) -> SyntaxKind {
|
||||
self.0.kind
|
||||
}
|
||||
|
||||
fn to_char(&self) -> Option<char> {
|
||||
self.1.chars().next()
|
||||
}
|
||||
|
||||
fn to_text(&self) -> SmolStr {
|
||||
self.1.into()
|
||||
}
|
||||
}
|
||||
|
||||
impl RawConvertor<'_> {}
|
||||
|
||||
impl<'a> TokenConvertor for RawConvertor<'a> {
|
||||
type Token = (RawToken, &'a str);
|
||||
|
||||
fn convert_doc_comment(&self, token: &Self::Token) -> Option<Vec<tt::TokenTree>> {
|
||||
convert_doc_comment(&doc_comment(token.1))
|
||||
}
|
||||
|
||||
fn bump(&mut self) -> Option<(Self::Token, TextRange)> {
|
||||
let token = self.inner.next()?;
|
||||
let range = TextRange::at(self.offset, token.len);
|
||||
self.offset += token.len;
|
||||
|
||||
Some(((*token, &self.text[range]), range))
|
||||
}
|
||||
|
||||
fn peek(&self) -> Option<Self::Token> {
|
||||
let token = self.inner.as_slice().get(0).cloned();
|
||||
|
||||
token.map(|it| {
|
||||
let range = TextRange::at(self.offset, it.len);
|
||||
(it, &self.text[range])
|
||||
})
|
||||
}
|
||||
|
||||
fn id_alloc(&mut self) -> &mut TokenIdAlloc {
|
||||
&mut self.id_alloc
|
||||
}
|
||||
}
|
||||
|
||||
struct Convertor {
|
||||
id_alloc: TokenIdAlloc,
|
||||
current: Option<SyntaxToken>,
|
||||
range: TextRange,
|
||||
punct_offset: Option<(SyntaxToken, TextSize)>,
|
||||
}
|
||||
|
||||
impl Convertor {
|
||||
fn new(node: &SyntaxNode, global_offset: TextSize) -> Convertor {
|
||||
Convertor {
|
||||
id_alloc: { TokenIdAlloc { map: TokenMap::default(), global_offset, next_id: 0 } },
|
||||
current: node.first_token(),
|
||||
range: node.text_range(),
|
||||
punct_offset: None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
enum SynToken {
|
||||
Ordiniary(SyntaxToken),
|
||||
Punch(SyntaxToken, TextSize),
|
||||
}
|
||||
|
||||
impl SynToken {
|
||||
fn token(&self) -> &SyntaxToken {
|
||||
match self {
|
||||
SynToken::Ordiniary(it) => it,
|
||||
SynToken::Punch(it, _) => it,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl SrcToken for SynToken {
|
||||
fn kind(&self) -> SyntaxKind {
|
||||
self.token().kind()
|
||||
}
|
||||
fn to_char(&self) -> Option<char> {
|
||||
match self {
|
||||
SynToken::Ordiniary(_) => None,
|
||||
SynToken::Punch(it, i) => it.text().chars().nth((*i).into()),
|
||||
}
|
||||
}
|
||||
fn to_text(&self) -> SmolStr {
|
||||
self.token().text().clone()
|
||||
}
|
||||
}
|
||||
|
||||
impl TokenConvertor for Convertor {
|
||||
type Token = SynToken;
|
||||
fn convert_doc_comment(&self, token: &Self::Token) -> Option<Vec<tt::TokenTree>> {
|
||||
convert_doc_comment(token.token())
|
||||
}
|
||||
|
||||
fn bump(&mut self) -> Option<(Self::Token, TextRange)> {
|
||||
if let Some((punct, offset)) = self.punct_offset.clone() {
|
||||
if usize::from(offset) + 1 < punct.text().len() {
|
||||
let offset = offset + TextSize::of('.');
|
||||
let range = punct.text_range();
|
||||
self.punct_offset = Some((punct.clone(), offset));
|
||||
let range = TextRange::at(range.start() + offset, TextSize::of('.'));
|
||||
return Some((SynToken::Punch(punct, offset), range));
|
||||
}
|
||||
}
|
||||
|
||||
let curr = self.current.clone()?;
|
||||
if !&self.range.contains_range(curr.text_range()) {
|
||||
return None;
|
||||
}
|
||||
self.current = curr.next_token();
|
||||
|
||||
let token = if curr.kind().is_punct() {
|
||||
let range = curr.text_range();
|
||||
let range = TextRange::at(range.start(), TextSize::of('.'));
|
||||
self.punct_offset = Some((curr.clone(), 0.into()));
|
||||
(SynToken::Punch(curr, 0.into()), range)
|
||||
} else {
|
||||
self.punct_offset = None;
|
||||
let range = curr.text_range();
|
||||
(SynToken::Ordiniary(curr), range)
|
||||
};
|
||||
|
||||
Some(token)
|
||||
}
|
||||
|
||||
fn peek(&self) -> Option<Self::Token> {
|
||||
if let Some((punct, mut offset)) = self.punct_offset.clone() {
|
||||
offset = offset + TextSize::of('.');
|
||||
if usize::from(offset) < punct.text().len() {
|
||||
return Some(SynToken::Punch(punct, offset));
|
||||
}
|
||||
}
|
||||
|
||||
let curr = self.current.clone()?;
|
||||
if !self.range.contains_range(curr.text_range()) {
|
||||
return None;
|
||||
}
|
||||
|
||||
let token = if curr.kind().is_punct() {
|
||||
SynToken::Punch(curr, 0.into())
|
||||
} else {
|
||||
SynToken::Ordiniary(curr)
|
||||
};
|
||||
Some(token)
|
||||
}
|
||||
|
||||
fn id_alloc(&mut self) -> &mut TokenIdAlloc {
|
||||
&mut self.id_alloc
|
||||
}
|
||||
}
|
||||
|
||||
struct TtTreeSink<'a> {
|
||||
buf: String,
|
||||
cursor: Cursor<'a>,
|
||||
open_delims: FxHashMap<tt::TokenId, TextSize>,
|
||||
text_pos: TextSize,
|
||||
inner: SyntaxTreeBuilder,
|
||||
token_map: TokenMap,
|
||||
|
||||
// Number of roots
|
||||
// Use for detect ill-form tree which is not single root
|
||||
roots: smallvec::SmallVec<[usize; 1]>,
|
||||
}
|
||||
|
||||
impl<'a> TtTreeSink<'a> {
|
||||
fn new(cursor: Cursor<'a>) -> Self {
|
||||
TtTreeSink {
|
||||
buf: String::new(),
|
||||
cursor,
|
||||
open_delims: FxHashMap::default(),
|
||||
text_pos: 0.into(),
|
||||
inner: SyntaxTreeBuilder::default(),
|
||||
roots: smallvec::SmallVec::new(),
|
||||
token_map: TokenMap::default(),
|
||||
}
|
||||
}
|
||||
|
||||
fn finish(self) -> (Parse<SyntaxNode>, TokenMap) {
|
||||
(self.inner.finish(), self.token_map)
|
||||
}
|
||||
}
|
||||
|
||||
fn delim_to_str(d: Option<tt::DelimiterKind>, closing: bool) -> SmolStr {
|
||||
let texts = match d {
|
||||
Some(tt::DelimiterKind::Parenthesis) => "()",
|
||||
Some(tt::DelimiterKind::Brace) => "{}",
|
||||
Some(tt::DelimiterKind::Bracket) => "[]",
|
||||
None => return "".into(),
|
||||
};
|
||||
|
||||
let idx = closing as usize;
|
||||
let text = &texts[idx..texts.len() - (1 - idx)];
|
||||
text.into()
|
||||
}
|
||||
|
||||
impl<'a> TreeSink for TtTreeSink<'a> {
|
||||
fn token(&mut self, kind: SyntaxKind, mut n_tokens: u8) {
|
||||
if kind == L_DOLLAR || kind == R_DOLLAR {
|
||||
self.cursor = self.cursor.bump_subtree();
|
||||
return;
|
||||
}
|
||||
if kind == LIFETIME {
|
||||
n_tokens = 2;
|
||||
}
|
||||
|
||||
let mut last = self.cursor;
|
||||
for _ in 0..n_tokens {
|
||||
if self.cursor.eof() {
|
||||
break;
|
||||
}
|
||||
last = self.cursor;
|
||||
let text: SmolStr = match self.cursor.token_tree() {
|
||||
Some(tt::TokenTree::Leaf(leaf)) => {
|
||||
// Mark the range if needed
|
||||
let (text, id) = match leaf {
|
||||
tt::Leaf::Ident(ident) => (ident.text.clone(), ident.id),
|
||||
tt::Leaf::Punct(punct) => {
|
||||
(SmolStr::new_inline_from_ascii(1, &[punct.char as u8]), punct.id)
|
||||
}
|
||||
tt::Leaf::Literal(lit) => (lit.text.clone(), lit.id),
|
||||
};
|
||||
let range = TextRange::at(self.text_pos, TextSize::of(text.as_str()));
|
||||
self.token_map.insert(id, range);
|
||||
self.cursor = self.cursor.bump();
|
||||
text
|
||||
}
|
||||
Some(tt::TokenTree::Subtree(subtree)) => {
|
||||
self.cursor = self.cursor.subtree().unwrap();
|
||||
if let Some(id) = subtree.delimiter.map(|it| it.id) {
|
||||
self.open_delims.insert(id, self.text_pos);
|
||||
}
|
||||
delim_to_str(subtree.delimiter_kind(), false)
|
||||
}
|
||||
None => {
|
||||
if let Some(parent) = self.cursor.end() {
|
||||
self.cursor = self.cursor.bump();
|
||||
if let Some(id) = parent.delimiter.map(|it| it.id) {
|
||||
if let Some(open_delim) = self.open_delims.get(&id) {
|
||||
let open_range = TextRange::at(*open_delim, TextSize::of('('));
|
||||
let close_range = TextRange::at(self.text_pos, TextSize::of('('));
|
||||
self.token_map.insert_delim(id, open_range, close_range);
|
||||
}
|
||||
}
|
||||
delim_to_str(parent.delimiter_kind(), true)
|
||||
} else {
|
||||
continue;
|
||||
}
|
||||
}
|
||||
};
|
||||
self.buf += &text;
|
||||
self.text_pos += TextSize::of(text.as_str());
|
||||
}
|
||||
|
||||
let text = SmolStr::new(self.buf.as_str());
|
||||
self.buf.clear();
|
||||
self.inner.token(kind, text);
|
||||
|
||||
// Add whitespace between adjoint puncts
|
||||
let next = last.bump();
|
||||
if let (
|
||||
Some(tt::TokenTree::Leaf(tt::Leaf::Punct(curr))),
|
||||
Some(tt::TokenTree::Leaf(tt::Leaf::Punct(_))),
|
||||
) = (last.token_tree(), next.token_tree())
|
||||
{
|
||||
// Note: We always assume the semi-colon would be the last token in
|
||||
// other parts of RA such that we don't add whitespace here.
|
||||
if curr.spacing == tt::Spacing::Alone && curr.char != ';' {
|
||||
self.inner.token(WHITESPACE, " ".into());
|
||||
self.text_pos += TextSize::of(' ');
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn start_node(&mut self, kind: SyntaxKind) {
|
||||
self.inner.start_node(kind);
|
||||
|
||||
match self.roots.last_mut() {
|
||||
None | Some(0) => self.roots.push(1),
|
||||
Some(ref mut n) => **n += 1,
|
||||
};
|
||||
}
|
||||
|
||||
fn finish_node(&mut self) {
|
||||
self.inner.finish_node();
|
||||
*self.roots.last_mut().unwrap() -= 1;
|
||||
}
|
||||
|
||||
fn error(&mut self, error: ParseError) {
|
||||
self.inner.error(error, self.text_pos)
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use crate::tests::parse_macro;
|
||||
use parser::TokenSource;
|
||||
use syntax::{
|
||||
algo::{insert_children, InsertPosition},
|
||||
ast::AstNode,
|
||||
};
|
||||
|
||||
#[test]
|
||||
fn convert_tt_token_source() {
|
||||
let expansion = parse_macro(
|
||||
r#"
|
||||
macro_rules! literals {
|
||||
($i:ident) => {
|
||||
{
|
||||
let a = 'c';
|
||||
let c = 1000;
|
||||
let f = 12E+99_f64;
|
||||
let s = "rust1";
|
||||
}
|
||||
}
|
||||
}
|
||||
"#,
|
||||
)
|
||||
.expand_tt("literals!(foo);");
|
||||
let tts = &[expansion.into()];
|
||||
let buffer = tt::buffer::TokenBuffer::new(tts);
|
||||
let mut tt_src = SubtreeTokenSource::new(&buffer);
|
||||
let mut tokens = vec![];
|
||||
while tt_src.current().kind != EOF {
|
||||
tokens.push((tt_src.current().kind, tt_src.text()));
|
||||
tt_src.bump();
|
||||
}
|
||||
|
||||
// [${]
|
||||
// [let] [a] [=] ['c'] [;]
|
||||
assert_eq!(tokens[2 + 3].1, "'c'");
|
||||
assert_eq!(tokens[2 + 3].0, CHAR);
|
||||
// [let] [c] [=] [1000] [;]
|
||||
assert_eq!(tokens[2 + 5 + 3].1, "1000");
|
||||
assert_eq!(tokens[2 + 5 + 3].0, INT_NUMBER);
|
||||
// [let] [f] [=] [12E+99_f64] [;]
|
||||
assert_eq!(tokens[2 + 10 + 3].1, "12E+99_f64");
|
||||
assert_eq!(tokens[2 + 10 + 3].0, FLOAT_NUMBER);
|
||||
|
||||
// [let] [s] [=] ["rust1"] [;]
|
||||
assert_eq!(tokens[2 + 15 + 3].1, "\"rust1\"");
|
||||
assert_eq!(tokens[2 + 15 + 3].0, STRING);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn stmts_token_trees_to_expr_is_err() {
|
||||
let expansion = parse_macro(
|
||||
r#"
|
||||
macro_rules! stmts {
|
||||
() => {
|
||||
let a = 0;
|
||||
let b = 0;
|
||||
let c = 0;
|
||||
let d = 0;
|
||||
}
|
||||
}
|
||||
"#,
|
||||
)
|
||||
.expand_tt("stmts!();");
|
||||
assert!(token_tree_to_syntax_node(&expansion, FragmentKind::Expr).is_err());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_token_tree_last_child_is_white_space() {
|
||||
let source_file = ast::SourceFile::parse("f!({} );").ok().unwrap();
|
||||
let macro_call = source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
|
||||
let token_tree = macro_call.token_tree().unwrap();
|
||||
|
||||
// Token Tree now is :
|
||||
// TokenTree
|
||||
// - T!['(']
|
||||
// - TokenTree
|
||||
// - T!['{']
|
||||
// - T!['}']
|
||||
// - WHITE_SPACE
|
||||
// - T![')']
|
||||
|
||||
let rbrace =
|
||||
token_tree.syntax().descendants_with_tokens().find(|it| it.kind() == T!['}']).unwrap();
|
||||
let space = token_tree
|
||||
.syntax()
|
||||
.descendants_with_tokens()
|
||||
.find(|it| it.kind() == SyntaxKind::WHITESPACE)
|
||||
.unwrap();
|
||||
|
||||
// reorder th white space, such that the white is inside the inner token-tree.
|
||||
let token_tree = insert_children(
|
||||
&rbrace.parent().unwrap(),
|
||||
InsertPosition::Last,
|
||||
std::iter::once(space),
|
||||
);
|
||||
|
||||
// Token Tree now is :
|
||||
// TokenTree
|
||||
// - T!['{']
|
||||
// - T!['}']
|
||||
// - WHITE_SPACE
|
||||
let token_tree = ast::TokenTree::cast(token_tree).unwrap();
|
||||
let tt = ast_to_token_tree(&token_tree).unwrap().0;
|
||||
|
||||
assert_eq!(tt.delimiter_kind(), Some(tt::DelimiterKind::Brace));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_token_tree_multi_char_punct() {
|
||||
let source_file = ast::SourceFile::parse("struct Foo { a: x::Y }").ok().unwrap();
|
||||
let struct_def = source_file.syntax().descendants().find_map(ast::Struct::cast).unwrap();
|
||||
let tt = ast_to_token_tree(&struct_def).unwrap().0;
|
||||
token_tree_to_syntax_node(&tt, FragmentKind::Item).unwrap();
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user