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syntax: extract sess.rs for ParseSess
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| //! Contains `ParseSess` which holds state living beyond what one `Parser` might. | ||
| //! It also serves as an input to the parser itself. | ||
| use crate::ast::{CrateConfig, NodeId}; | ||
| use crate::early_buffered_lints::{BufferedEarlyLint, BufferedEarlyLintId}; | ||
| use crate::source_map::{SourceMap, FilePathMapping}; | ||
| use crate::feature_gate::UnstableFeatures; | ||
|
|
||
| use errors::{Applicability, Handler, ColorConfig, DiagnosticBuilder}; | ||
| use rustc_data_structures::fx::{FxHashSet, FxHashMap}; | ||
| use rustc_data_structures::sync::{Lrc, Lock, Once}; | ||
| use syntax_pos::{Symbol, Span, MultiSpan}; | ||
| use syntax_pos::edition::Edition; | ||
| use syntax_pos::hygiene::ExpnId; | ||
|
|
||
| use std::path::PathBuf; | ||
| use std::str; | ||
|
|
||
| /// Collected spans during parsing for places where a certain feature was | ||
| /// used and should be feature gated accordingly in `check_crate`. | ||
| #[derive(Default)] | ||
| crate struct GatedSpans { | ||
| /// Spans collected for gating `let_chains`, e.g. `if a && let b = c {}`. | ||
| crate let_chains: Lock<Vec<Span>>, | ||
| /// Spans collected for gating `async_closure`, e.g. `async || ..`. | ||
| crate async_closure: Lock<Vec<Span>>, | ||
| /// Spans collected for gating `yield e?` expressions (`generators` gate). | ||
| crate yields: Lock<Vec<Span>>, | ||
| /// Spans collected for gating `or_patterns`, e.g. `Some(Foo | Bar)`. | ||
| crate or_patterns: Lock<Vec<Span>>, | ||
| /// Spans collected for gating `const_extern_fn`, e.g. `const extern fn foo`. | ||
| crate const_extern_fn: Lock<Vec<Span>>, | ||
| } | ||
|
|
||
| /// Info about a parsing session. | ||
| pub struct ParseSess { | ||
| pub span_diagnostic: Handler, | ||
| crate unstable_features: UnstableFeatures, | ||
| pub config: CrateConfig, | ||
| pub edition: Edition, | ||
| pub missing_fragment_specifiers: Lock<FxHashSet<Span>>, | ||
| /// Places where raw identifiers were used. This is used for feature-gating raw identifiers. | ||
| pub raw_identifier_spans: Lock<Vec<Span>>, | ||
| /// Used to determine and report recursive module inclusions. | ||
| pub(super) included_mod_stack: Lock<Vec<PathBuf>>, | ||
| source_map: Lrc<SourceMap>, | ||
| pub buffered_lints: Lock<Vec<BufferedEarlyLint>>, | ||
| /// Contains the spans of block expressions that could have been incomplete based on the | ||
| /// operation token that followed it, but that the parser cannot identify without further | ||
| /// analysis. | ||
| pub ambiguous_block_expr_parse: Lock<FxHashMap<Span, Span>>, | ||
| pub injected_crate_name: Once<Symbol>, | ||
| crate gated_spans: GatedSpans, | ||
| } | ||
|
|
||
| impl ParseSess { | ||
| pub fn new(file_path_mapping: FilePathMapping) -> Self { | ||
| let cm = Lrc::new(SourceMap::new(file_path_mapping)); | ||
| let handler = Handler::with_tty_emitter( | ||
| ColorConfig::Auto, | ||
| true, | ||
| None, | ||
| Some(cm.clone()), | ||
| ); | ||
| ParseSess::with_span_handler(handler, cm) | ||
| } | ||
|
|
||
| pub fn with_span_handler(handler: Handler, source_map: Lrc<SourceMap>) -> Self { | ||
| Self { | ||
| span_diagnostic: handler, | ||
| unstable_features: UnstableFeatures::from_environment(), | ||
| config: FxHashSet::default(), | ||
| edition: ExpnId::root().expn_data().edition, | ||
| missing_fragment_specifiers: Lock::new(FxHashSet::default()), | ||
| raw_identifier_spans: Lock::new(Vec::new()), | ||
| included_mod_stack: Lock::new(vec![]), | ||
| source_map, | ||
| buffered_lints: Lock::new(vec![]), | ||
| ambiguous_block_expr_parse: Lock::new(FxHashMap::default()), | ||
| injected_crate_name: Once::new(), | ||
| gated_spans: GatedSpans::default(), | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| pub fn source_map(&self) -> &SourceMap { | ||
| &self.source_map | ||
| } | ||
|
|
||
| pub fn buffer_lint( | ||
| &self, | ||
| lint_id: BufferedEarlyLintId, | ||
| span: impl Into<MultiSpan>, | ||
| id: NodeId, | ||
| msg: &str, | ||
| ) { | ||
| self.buffered_lints.with_lock(|buffered_lints| { | ||
| buffered_lints.push(BufferedEarlyLint{ | ||
| span: span.into(), | ||
| id, | ||
| msg: msg.into(), | ||
| lint_id, | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| /// Extend an error with a suggestion to wrap an expression with parentheses to allow the | ||
| /// parser to continue parsing the following operation as part of the same expression. | ||
| pub fn expr_parentheses_needed( | ||
| &self, | ||
| err: &mut DiagnosticBuilder<'_>, | ||
| span: Span, | ||
| alt_snippet: Option<String>, | ||
| ) { | ||
| if let Some(snippet) = self.source_map().span_to_snippet(span).ok().or(alt_snippet) { | ||
| err.span_suggestion( | ||
| span, | ||
| "parentheses are required to parse this as an expression", | ||
| format!("({})", snippet), | ||
| Applicability::MachineApplicable, | ||
| ); | ||
| } | ||
| } | ||
| } |