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//! An experimental implementation of [Rust RFC#2256 libsyntax2.0][rfc#2256].
//!
//! The intent is to be an IDE-ready parser, i.e. one that offers
//!
//! - easy and fast incremental re-parsing,
//! - graceful handling of errors, and
//! - maintains all information in the source file.
//!
//! For more information, see [the RFC][rfc#2265], or [the working draft][RFC.md].
//!
//! [rfc#2256]: <https://github.com/rust-lang/rfcs/pull/2256>
//! [RFC.md]: <https://github.com/matklad/libsyntax2/blob/master/docs/RFC.md>
#![forbid(missing_debug_implementations, unconditional_recursion, future_incompatible)]
#![deny(bad_style, missing_docs)]
#![allow(missing_docs)]
//#![warn(unreachable_pub)] // rust-lang/rust#47816
pub mod algo;
pub mod ast;
mod lexer;
#[macro_use]
mod token_set;
mod grammar;
mod parser_api;
mod parser_impl;
mod reparsing;
mod string_lexing;
mod syntax_kinds;
/// Utilities for simple uses of the parser.
pub mod utils;
mod validation;
mod yellow;
mod ptr;
pub use rowan::{SmolStr, TextRange, TextUnit};
pub use crate::{
ast::AstNode,
lexer::{tokenize, Token},
syntax_kinds::SyntaxKind,
yellow::{Direction, SyntaxError, SyntaxNode, WalkEvent, Location, TreeArc},
ptr::{SyntaxNodePtr, AstPtr},
};
use ra_text_edit::AtomTextEdit;
use crate::yellow::GreenNode;
/// `SourceFile` represents a parse tree for a single Rust file.
pub use crate::ast::SourceFile;
impl SourceFile {
fn new(green: GreenNode, errors: Vec<SyntaxError>) -> TreeArc<SourceFile> {
let root = SyntaxNode::new(green, errors);
if cfg!(debug_assertions) {
utils::validate_block_structure(&root);
}
assert_eq!(root.kind(), SyntaxKind::SOURCE_FILE);
TreeArc::cast(root)
}
pub fn parse(text: &str) -> TreeArc<SourceFile> {
let tokens = tokenize(&text);
let (green, errors) =
parser_impl::parse_with(yellow::GreenBuilder::new(), text, &tokens, grammar::root);
SourceFile::new(green, errors)
}
pub fn reparse(&self, edit: &AtomTextEdit) -> TreeArc<SourceFile> {
self.incremental_reparse(edit).unwrap_or_else(|| self.full_reparse(edit))
}
pub fn incremental_reparse(&self, edit: &AtomTextEdit) -> Option<TreeArc<SourceFile>> {
reparsing::incremental_reparse(self.syntax(), edit, self.errors())
.map(|(green_node, errors)| SourceFile::new(green_node, errors))
}
fn full_reparse(&self, edit: &AtomTextEdit) -> TreeArc<SourceFile> {
let text = edit.apply(self.syntax().text().to_string());
SourceFile::parse(&text)
}
pub fn errors(&self) -> Vec<SyntaxError> {
let mut errors = self.syntax.root_data().clone();
errors.extend(validation::validate(self));
errors
}
}
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