parser tests work

crates/parser/src/lib.rs

@@ -24,40 +24,11 @@ mod tokens;
 
 pub(crate) use token_set::TokenSet;
 
-pub use syntax_kind::SyntaxKind;
-
-use crate::tokens::Tokens;
+pub use crate::{syntax_kind::SyntaxKind, tokens::Tokens};
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct ParseError(pub Box<String>);
 
-/// `TokenSource` abstracts the source of the tokens parser operates on.
-///
-/// Hopefully this will allow us to treat text and token trees in the same way!
-pub trait TokenSource {
-    fn current(&self) -> Token;
-
-    /// Lookahead n token
-    fn lookahead_nth(&self, n: usize) -> Token;
-
-    /// bump cursor to next token
-    fn bump(&mut self);
-
-    /// Is the current token a specified keyword?
-    fn is_keyword(&self, kw: &str) -> bool;
-}
-
-/// `Token` abstracts the cursor of `TokenSource` operates on.
-#[derive(Debug, Copy, Clone, Eq, PartialEq)]
-pub struct Token {
-    /// What is the current token?
-    pub kind: SyntaxKind,
-
-    /// Is the current token joined to the next one (`> >` vs `>>`).
-    pub is_jointed_to_next: bool,
-    pub contextual_kw: SyntaxKind,
-}
-
 /// `TreeSink` abstracts details of a particular syntax tree implementation.
 pub trait TreeSink {
     /// Adds new token to the current branch.

crates/parser/src/syntax_kind/generated.rs

@@ -334,6 +334,18 @@ impl SyntaxKind {
         };
         Some(kw)
     }
+    pub fn from_contextual_keyword(ident: &str) -> Option<SyntaxKind> {
+        let kw = match ident {
+            "auto" => AUTO_KW,
+            "default" => DEFAULT_KW,
+            "existential" => EXISTENTIAL_KW,
+            "union" => UNION_KW,
+            "raw" => RAW_KW,
+            "macro_rules" => MACRO_RULES_KW,
+            _ => return None,
+        };
+        Some(kw)
+    }
     pub fn from_char(c: char) -> Option<SyntaxKind> {
         let tok = match c {
             ';' => SEMICOLON,

crates/parser/src/tokens.rs

@@ -1,8 +1,19 @@
-use crate::{SyntaxKind, Token};
+use crate::SyntaxKind;
 
 #[allow(non_camel_case_types)]
 type bits = u64;
 
+/// `Token` abstracts the cursor of `TokenSource` operates on.
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub(crate) struct Token {
+    /// What is the current token?
+    pub(crate) kind: SyntaxKind,
+
+    /// Is the current token joined to the next one (`> >` vs `>>`).
+    pub(crate) is_jointed_to_next: bool,
+    pub(crate) contextual_kw: SyntaxKind,
+}
+
 /// Main input to the parser.
 ///
 /// A sequence of tokens represented internally as a struct of arrays.
@@ -49,13 +60,14 @@ impl Tokens {
         self.kind.len()
     }
     pub(crate) fn get(&self, idx: usize) -> Token {
-        if idx > self.len() {
-            return self.eof();
+        if idx < self.len() {
+            let kind = self.kind[idx];
+            let is_jointed_to_next = self.get_joint(idx);
+            let contextual_kw = self.contextual_kw[idx];
+            Token { kind, is_jointed_to_next, contextual_kw }
+        } else {
+            self.eof()
         }
-        let kind = self.kind[idx];
-        let is_jointed_to_next = self.get_joint(idx);
-        let contextual_kw = self.contextual_kw[idx];
-        Token { kind, is_jointed_to_next, contextual_kw }
     }
 
     #[cold]

crates/syntax/src/parsing.rs

@@ -2,12 +2,10 @@
 //! incremental reparsing.
 
 pub(crate) mod lexer;
-mod text_token_source;
 mod text_tree_sink;
 mod reparsing;
 
 use parser::SyntaxKind;
-use text_token_source::TextTokenSource;
 use text_tree_sink::TextTreeSink;
 
 use crate::{syntax_node::GreenNode, AstNode, SyntaxError, SyntaxNode};
@@ -15,12 +13,12 @@ use crate::{syntax_node::GreenNode, AstNode, SyntaxError, SyntaxNode};
 pub(crate) use crate::parsing::{lexer::*, reparsing::incremental_reparse};
 
 pub(crate) fn parse_text(text: &str) -> (GreenNode, Vec<SyntaxError>) {
-    let (tokens, lexer_errors) = tokenize(text);
+    let (lexer_tokens, lexer_errors) = tokenize(text);
+    let parser_tokens = to_parser_tokens(text, &lexer_tokens);
 
-    let mut token_source = TextTokenSource::new(text, &tokens);
-    let mut tree_sink = TextTreeSink::new(text, &tokens);
+    let mut tree_sink = TextTreeSink::new(text, &lexer_tokens);
 
-    parser::parse_source_file(&mut token_source, &mut tree_sink);
+    parser::parse_source_file(&parser_tokens, &mut tree_sink);
 
     let (tree, mut parser_errors) = tree_sink.finish();
     parser_errors.extend(lexer_errors);
@@ -33,26 +31,47 @@ pub(crate) fn parse_text_as<T: AstNode>(
     text: &str,
     entry_point: parser::ParserEntryPoint,
 ) -> Result<T, ()> {
-    let (tokens, lexer_errors) = tokenize(text);
+    let (lexer_tokens, lexer_errors) = tokenize(text);
     if !lexer_errors.is_empty() {
         return Err(());
     }
 
-    let mut token_source = TextTokenSource::new(text, &tokens);
-    let mut tree_sink = TextTreeSink::new(text, &tokens);
+    let parser_tokens = to_parser_tokens(text, &lexer_tokens);
+
+    let mut tree_sink = TextTreeSink::new(text, &lexer_tokens);
 
     // TextTreeSink assumes that there's at least some root node to which it can attach errors and
     // tokens. We arbitrarily give it a SourceFile.
     use parser::TreeSink;
     tree_sink.start_node(SyntaxKind::SOURCE_FILE);
-    parser::parse(&mut token_source, &mut tree_sink, entry_point);
+    parser::parse(&parser_tokens, &mut tree_sink, entry_point);
     tree_sink.finish_node();
 
-    let (tree, parser_errors) = tree_sink.finish();
-    use parser::TokenSource;
-    if !parser_errors.is_empty() || token_source.current().kind != SyntaxKind::EOF {
+    let (tree, parser_errors, eof) = tree_sink.finish_eof();
+    if !parser_errors.is_empty() || !eof {
         return Err(());
     }
 
     SyntaxNode::new_root(tree).first_child().and_then(T::cast).ok_or(())
 }
+
+pub(crate) fn to_parser_tokens(text: &str, lexer_tokens: &[lexer::Token]) -> ::parser::Tokens {
+    let mut off = 0;
+    let mut res = parser::Tokens::default();
+    let mut was_joint = true;
+    for t in lexer_tokens {
+        if t.kind.is_trivia() {
+            was_joint = false;
+        } else if t.kind == SyntaxKind::IDENT {
+            let token_text = &text[off..][..usize::from(t.len)];
+            let contextual_kw =
+                SyntaxKind::from_contextual_keyword(token_text).unwrap_or(SyntaxKind::IDENT);
+            res.push_ident(contextual_kw);
+        } else {
+            res.push(was_joint, t.kind);
+            was_joint = true;
+        }
+        off += usize::from(t.len);
+    }
+    res
+}

crates/syntax/src/parsing/reparsing.rs

@@ -12,8 +12,8 @@ use text_edit::Indel;
 use crate::{
     parsing::{
         lexer::{lex_single_syntax_kind, tokenize, Token},
-        text_token_source::TextTokenSource,
         text_tree_sink::TextTreeSink,
+        to_parser_tokens,
     },
     syntax_node::{GreenNode, GreenToken, NodeOrToken, SyntaxElement, SyntaxNode},
     SyntaxError,
@@ -91,14 +91,14 @@ fn reparse_block(
     let (node, reparser) = find_reparsable_node(root, edit.delete)?;
     let text = get_text_after_edit(node.clone().into(), edit);
 
-    let (tokens, new_lexer_errors) = tokenize(&text);
-    if !is_balanced(&tokens) {
+    let (lexer_tokens, new_lexer_errors) = tokenize(&text);
+    if !is_balanced(&lexer_tokens) {
         return None;
     }
+    let parser_tokens = to_parser_tokens(&text, &lexer_tokens);
 
-    let mut token_source = TextTokenSource::new(&text, &tokens);
-    let mut tree_sink = TextTreeSink::new(&text, &tokens);
-    reparser.parse(&mut token_source, &mut tree_sink);
+    let mut tree_sink = TextTreeSink::new(&text, &lexer_tokens);
+    reparser.parse(&parser_tokens, &mut tree_sink);
 
     let (green, mut new_parser_errors) = tree_sink.finish();
     new_parser_errors.extend(new_lexer_errors);

crates/syntax/src/parsing/text_token_source.rs

@@ -1,82 +0,0 @@
-//! See `TextTokenSource` docs.
-
-use parser::TokenSource;
-
-use crate::{parsing::lexer::Token, SyntaxKind::EOF, TextRange, TextSize};
-
-/// Implementation of `parser::TokenSource` that takes tokens from source code text.
-pub(crate) struct TextTokenSource<'t> {
-    text: &'t str,
-    /// token and its start position (non-whitespace/comment tokens)
-    /// ```non-rust
-    ///  struct Foo;
-    ///  ^------^--^-
-    ///  |      |    \________
-    ///  |      \____         \
-    ///  |           \         |
-    ///  (struct, 0) (Foo, 7) (;, 10)
-    /// ```
-    /// `[(struct, 0), (Foo, 7), (;, 10)]`
-    token_offset_pairs: Vec<(Token, TextSize)>,
-
-    /// Current token and position
-    curr: (parser::Token, usize),
-}
-
-impl<'t> TokenSource for TextTokenSource<'t> {
-    fn current(&self) -> parser::Token {
-        self.curr.0
-    }
-
-    fn lookahead_nth(&self, n: usize) -> parser::Token {
-        mk_token(self.curr.1 + n, &self.token_offset_pairs)
-    }
-
-    fn bump(&mut self) {
-        if self.curr.0.kind == EOF {
-            return;
-        }
-
-        let pos = self.curr.1 + 1;
-        self.curr = (mk_token(pos, &self.token_offset_pairs), pos);
-    }
-
-    fn is_keyword(&self, kw: &str) -> bool {
-        self.token_offset_pairs
-            .get(self.curr.1)
-            .map_or(false, |(token, offset)| &self.text[TextRange::at(*offset, token.len)] == kw)
-    }
-}
-
-fn mk_token(pos: usize, token_offset_pairs: &[(Token, TextSize)]) -> parser::Token {
-    let (kind, is_jointed_to_next) = match token_offset_pairs.get(pos) {
-        Some((token, offset)) => (
-            token.kind,
-            token_offset_pairs
-                .get(pos + 1)
-                .map_or(false, |(_, next_offset)| offset + token.len == *next_offset),
-        ),
-        None => (EOF, false),
-    };
-    parser::Token { kind, is_jointed_to_next }
-}
-
-impl<'t> TextTokenSource<'t> {
-    /// Generate input from tokens(expect comment and whitespace).
-    pub(crate) fn new(text: &'t str, raw_tokens: &'t [Token]) -> TextTokenSource<'t> {
-        let token_offset_pairs: Vec<_> = raw_tokens
-            .iter()
-            .filter_map({
-                let mut len = 0.into();
-                move |token| {
-                    let pair = if token.kind.is_trivia() { None } else { Some((*token, len)) };
-                    len += token.len;
-                    pair
-                }
-            })
-            .collect();
-
-        let first = mk_token(0, &token_offset_pairs);
-        TextTokenSource { text, token_offset_pairs, curr: (first, 0) }
-    }
-}

crates/syntax/src/parsing/text_tree_sink.rs

@@ -104,7 +104,7 @@ impl<'a> TextTreeSink<'a> {
         }
     }
 
-    pub(super) fn finish(mut self) -> (GreenNode, Vec<SyntaxError>) {
+    pub(super) fn finish_eof(mut self) -> (GreenNode, Vec<SyntaxError>, bool) {
         match mem::replace(&mut self.state, State::Normal) {
             State::PendingFinish => {
                 self.eat_trivias();
@@ -113,7 +113,15 @@ impl<'a> TextTreeSink<'a> {
             State::PendingStart | State::Normal => unreachable!(),
         }
 
-        self.inner.finish_raw()
+        let (node, errors) = self.inner.finish_raw();
+        let is_eof = self.token_pos == self.tokens.len();
+
+        (node, errors, is_eof)
+    }
+
+    pub(super) fn finish(self) -> (GreenNode, Vec<SyntaxError>) {
+        let (node, errors, _eof) = self.finish_eof();
+        (node, errors)
     }
 
     fn eat_trivias(&mut self) {

crates/syntax/src/tests/sourcegen_ast.rs

@@ -359,6 +359,10 @@ fn generate_syntax_kinds(grammar: KindsSrc<'_>) -> String {
     let full_keywords =
         full_keywords_values.iter().map(|kw| format_ident!("{}_KW", to_upper_snake_case(kw)));
 
+    let contextual_keywords_values = &grammar.contextual_keywords;
+    let contextual_keywords =
+        contextual_keywords_values.iter().map(|kw| format_ident!("{}_KW", to_upper_snake_case(kw)));
+
     let all_keywords_values =
         grammar.keywords.iter().chain(grammar.contextual_keywords.iter()).collect::<Vec<_>>();
     let all_keywords_idents = all_keywords_values.iter().map(|kw| format_ident!("{}", kw));
@@ -428,6 +432,14 @@ fn generate_syntax_kinds(grammar: KindsSrc<'_>) -> String {
                 Some(kw)
             }
 
+            pub fn from_contextual_keyword(ident: &str) -> Option<SyntaxKind> {
+                let kw = match ident {
+                    #(#contextual_keywords_values => #contextual_keywords,)*
+                    _ => return None,
+                };
+                Some(kw)
+            }
+
             pub fn from_char(c: char) -> Option<SyntaxKind> {
                 let tok = match c {
                     #(#single_byte_tokens_values => #single_byte_tokens,)*