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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
extern crate arrayvec;
extern crate drop_bomb;
extern crate itertools;
extern crate parking_lot;
extern crate rowan;
extern crate unicode_xid;
#[cfg(test)]
#[macro_use]
extern crate test_utils;
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;
pub mod text_utils;
/// Utilities for simple uses of the parser.
pub mod utils;
mod validation;
mod yellow;
pub use crate::{
ast::AstNode,
lexer::{tokenize, Token},
reparsing::AtomEdit,
rowan::{SmolStr, TextRange, TextUnit},
syntax_kinds::SyntaxKind,
yellow::{
Direction, OwnedRoot, RefRoot, SyntaxError, SyntaxNode, SyntaxNodeRef, TreeRoot, WalkEvent, Location,
},
};
use crate::yellow::GreenNode;
/// `SourceFileNode` represents a parse tree for a single Rust file.
pub use crate::ast::SourceFileNode;
impl SourceFileNode {
fn new(green: GreenNode, errors: Vec<SyntaxError>) -> SourceFileNode {
let root = SyntaxNode::new(green, errors);
if cfg!(debug_assertions) {
utils::validate_block_structure(root.borrowed());
}
assert_eq!(root.kind(), SyntaxKind::SOURCE_FILE);
ast::SourceFileNode { syntax: root }
}
pub fn parse(text: &str) -> SourceFileNode {
let tokens = tokenize(&text);
let (green, errors) =
parser_impl::parse_with(yellow::GreenBuilder::new(), text, &tokens, grammar::root);
SourceFileNode::new(green, errors)
}
pub fn reparse(&self, edit: &AtomEdit) -> SourceFileNode {
self.incremental_reparse(edit)
.unwrap_or_else(|| self.full_reparse(edit))
}
pub fn incremental_reparse(&self, edit: &AtomEdit) -> Option<SourceFileNode> {
reparsing::incremental_reparse(self.syntax(), edit, self.errors())
.map(|(green_node, errors)| SourceFileNode::new(green_node, errors))
}
fn full_reparse(&self, edit: &AtomEdit) -> SourceFileNode {
let text =
text_utils::replace_range(self.syntax().text().to_string(), edit.delete, &edit.insert);
SourceFileNode::parse(&text)
}
/// Typed AST representation of the parse tree.
pub fn ast(&self) -> ast::SourceFile {
self.borrowed()
}
/// Untyped homogeneous representation of the parse tree.
pub fn syntax(&self) -> SyntaxNodeRef {
self.syntax.borrowed()
}
pub fn errors(&self) -> Vec<SyntaxError> {
let mut errors = self.syntax.root_data().clone();
errors.extend(validation::validate(self));
errors
}
}
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