mirror of
https://github.com/rust-lang/rust-analyzer.git
synced 2025-10-28 10:39:45 +00:00
716 lines
26 KiB
Rust
716 lines
26 KiB
Rust
//! `ItemTree` debug printer.
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use std::fmt::{self, Write};
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use la_arena::{Idx, RawIdx};
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use span::{Edition, ErasedFileAstId};
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use crate::{
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generics::{TypeOrConstParamData, WherePredicate, WherePredicateTypeTarget},
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item_tree::{
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AttrOwner, Const, DefDatabase, Enum, ExternBlock, ExternCrate, Field, FieldParent,
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FieldsShape, FileItemTreeId, FnFlags, Function, GenericModItem, GenericParams, Impl,
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ItemTree, Macro2, MacroCall, MacroRules, Mod, ModItem, ModKind, Param, Path, RawAttrs,
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RawVisibilityId, Static, Struct, Trait, TraitAlias, TypeAlias, TypeBound, Union, Use,
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UseTree, UseTreeKind, Variant,
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},
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pretty::{print_path, print_type_bounds, print_type_ref},
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type_ref::{TypeRefId, TypesMap},
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visibility::RawVisibility,
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};
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pub(super) fn print_item_tree(db: &dyn DefDatabase, tree: &ItemTree, edition: Edition) -> String {
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let mut p =
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Printer { db, tree, buf: String::new(), indent_level: 0, needs_indent: true, edition };
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if let Some(attrs) = tree.attrs.get(&AttrOwner::TopLevel) {
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p.print_attrs(attrs, true, "\n");
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}
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p.blank();
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for item in tree.top_level_items() {
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p.print_mod_item(*item);
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}
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let mut s = p.buf.trim_end_matches('\n').to_owned();
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s.push('\n');
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s
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}
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macro_rules! w {
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($dst:expr, $($arg:tt)*) => {
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{ let _ = write!($dst, $($arg)*); }
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};
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}
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macro_rules! wln {
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($dst:expr) => {
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{ let _ = writeln!($dst); }
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};
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($dst:expr, $($arg:tt)*) => {
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{ let _ = writeln!($dst, $($arg)*); }
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};
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}
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struct Printer<'a> {
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db: &'a dyn DefDatabase,
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tree: &'a ItemTree,
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buf: String,
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indent_level: usize,
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needs_indent: bool,
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edition: Edition,
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}
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impl Printer<'_> {
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fn indented(&mut self, f: impl FnOnce(&mut Self)) {
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self.indent_level += 1;
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wln!(self);
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f(self);
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self.indent_level -= 1;
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self.buf = self.buf.trim_end_matches('\n').to_owned();
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}
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/// Ensures that a blank line is output before the next text.
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fn blank(&mut self) {
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let mut iter = self.buf.chars().rev().fuse();
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match (iter.next(), iter.next()) {
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(Some('\n'), Some('\n') | None) | (None, None) => {}
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(Some('\n'), Some(_)) => {
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self.buf.push('\n');
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}
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(Some(_), _) => {
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self.buf.push('\n');
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self.buf.push('\n');
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}
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(None, Some(_)) => unreachable!(),
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}
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}
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fn whitespace(&mut self) {
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match self.buf.chars().next_back() {
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None | Some('\n' | ' ') => {}
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_ => self.buf.push(' '),
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}
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}
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fn print_attrs(&mut self, attrs: &RawAttrs, inner: bool, separated_by: &str) {
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let inner = if inner { "!" } else { "" };
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for attr in &**attrs {
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w!(
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self,
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"#{}[{}{}]{}",
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inner,
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attr.path.display(self.db.upcast(), self.edition),
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attr.input.as_ref().map(|it| it.to_string()).unwrap_or_default(),
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separated_by,
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);
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}
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}
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fn print_attrs_of(&mut self, of: impl Into<AttrOwner>, separated_by: &str) {
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if let Some(attrs) = self.tree.attrs.get(&of.into()) {
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self.print_attrs(attrs, false, separated_by);
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}
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}
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fn print_visibility(&mut self, vis: RawVisibilityId) {
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match &self.tree[vis] {
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RawVisibility::Module(path, _expl) => {
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w!(self, "pub({}) ", path.display(self.db.upcast(), self.edition))
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}
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RawVisibility::Public => w!(self, "pub "),
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};
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}
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fn print_fields(
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&mut self,
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parent: FieldParent,
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kind: FieldsShape,
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fields: &[Field],
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map: &TypesMap,
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) {
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let edition = self.edition;
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match kind {
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FieldsShape::Record => {
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self.whitespace();
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w!(self, "{{");
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self.indented(|this| {
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for (idx, Field { name, type_ref, visibility }) in fields.iter().enumerate() {
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this.print_attrs_of(
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AttrOwner::Field(parent, Idx::from_raw(RawIdx::from(idx as u32))),
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"\n",
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);
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this.print_visibility(*visibility);
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w!(this, "{}: ", name.display(self.db.upcast(), edition));
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this.print_type_ref(*type_ref, map);
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wln!(this, ",");
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}
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});
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w!(self, "}}");
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}
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FieldsShape::Tuple => {
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w!(self, "(");
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self.indented(|this| {
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for (idx, Field { name, type_ref, visibility }) in fields.iter().enumerate() {
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this.print_attrs_of(
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AttrOwner::Field(parent, Idx::from_raw(RawIdx::from(idx as u32))),
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"\n",
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);
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this.print_visibility(*visibility);
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w!(this, "{}: ", name.display(self.db.upcast(), edition));
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this.print_type_ref(*type_ref, map);
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wln!(this, ",");
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}
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});
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w!(self, ")");
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}
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FieldsShape::Unit => {}
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}
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}
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fn print_fields_and_where_clause(
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&mut self,
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parent: FieldParent,
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kind: FieldsShape,
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fields: &[Field],
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params: &GenericParams,
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map: &TypesMap,
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) {
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match kind {
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FieldsShape::Record => {
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if self.print_where_clause(params) {
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wln!(self);
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}
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self.print_fields(parent, kind, fields, map);
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}
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FieldsShape::Unit => {
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self.print_where_clause(params);
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self.print_fields(parent, kind, fields, map);
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}
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FieldsShape::Tuple => {
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self.print_fields(parent, kind, fields, map);
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self.print_where_clause(params);
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}
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}
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}
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fn print_use_tree(&mut self, use_tree: &UseTree) {
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match &use_tree.kind {
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UseTreeKind::Single { path, alias } => {
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w!(self, "{}", path.display(self.db.upcast(), self.edition));
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if let Some(alias) = alias {
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w!(self, " as {}", alias.display(self.edition));
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}
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}
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UseTreeKind::Glob { path } => {
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if let Some(path) = path {
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w!(self, "{}::", path.display(self.db.upcast(), self.edition));
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}
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w!(self, "*");
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}
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UseTreeKind::Prefixed { prefix, list } => {
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if let Some(prefix) = prefix {
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w!(self, "{}::", prefix.display(self.db.upcast(), self.edition));
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}
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w!(self, "{{");
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for (i, tree) in list.iter().enumerate() {
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if i != 0 {
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w!(self, ", ");
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}
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self.print_use_tree(tree);
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}
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w!(self, "}}");
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}
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}
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}
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fn print_mod_item(&mut self, item: ModItem) {
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self.print_attrs_of(item, "\n");
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match item {
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ModItem::Use(it) => {
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let Use { visibility, use_tree, ast_id } = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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w!(self, "use ");
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self.print_use_tree(use_tree);
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wln!(self, ";");
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}
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ModItem::ExternCrate(it) => {
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let ExternCrate { name, alias, visibility, ast_id } = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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w!(self, "extern crate {}", name.display(self.db.upcast(), self.edition));
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if let Some(alias) = alias {
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w!(self, " as {}", alias.display(self.edition));
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}
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wln!(self, ";");
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}
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ModItem::ExternBlock(it) => {
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let ExternBlock { abi, ast_id, children } = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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w!(self, "extern ");
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if let Some(abi) = abi {
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w!(self, "\"{}\" ", abi);
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}
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w!(self, "{{");
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self.indented(|this| {
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for child in &**children {
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this.print_mod_item(*child);
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}
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});
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wln!(self, "}}");
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}
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ModItem::Function(it) => {
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let Function {
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name,
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visibility,
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explicit_generic_params,
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abi,
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params,
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ret_type,
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ast_id,
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types_map,
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flags,
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} = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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if flags.contains(FnFlags::HAS_DEFAULT_KW) {
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w!(self, "default ");
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}
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if flags.contains(FnFlags::HAS_CONST_KW) {
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w!(self, "const ");
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}
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if flags.contains(FnFlags::HAS_ASYNC_KW) {
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w!(self, "async ");
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}
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if flags.contains(FnFlags::HAS_UNSAFE_KW) {
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w!(self, "unsafe ");
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}
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if flags.contains(FnFlags::HAS_SAFE_KW) {
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w!(self, "safe ");
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}
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if let Some(abi) = abi {
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w!(self, "extern \"{}\" ", abi);
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}
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w!(self, "fn {}", name.display(self.db.upcast(), self.edition));
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self.print_generic_params(explicit_generic_params, it.into());
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w!(self, "(");
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if !params.is_empty() {
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self.indented(|this| {
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for (idx, Param { type_ref }) in params.iter().enumerate() {
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this.print_attrs_of(
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AttrOwner::Param(it, Idx::from_raw(RawIdx::from(idx as u32))),
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"\n",
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);
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if idx == 0 && flags.contains(FnFlags::HAS_SELF_PARAM) {
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w!(this, "self: ");
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}
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if let Some(type_ref) = type_ref {
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this.print_type_ref(*type_ref, types_map);
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} else {
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wln!(this, "...");
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}
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wln!(this, ",");
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}
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});
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}
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w!(self, ") -> ");
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self.print_type_ref(*ret_type, types_map);
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self.print_where_clause(explicit_generic_params);
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if flags.contains(FnFlags::HAS_BODY) {
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wln!(self, " {{ ... }}");
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} else {
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wln!(self, ";");
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}
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}
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ModItem::Struct(it) => {
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let Struct {
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visibility,
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name,
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fields,
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shape: kind,
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generic_params,
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ast_id,
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types_map,
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} = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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w!(self, "struct {}", name.display(self.db.upcast(), self.edition));
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self.print_generic_params(generic_params, it.into());
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self.print_fields_and_where_clause(
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FieldParent::Struct(it),
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*kind,
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fields,
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generic_params,
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types_map,
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);
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if matches!(kind, FieldsShape::Record) {
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wln!(self);
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} else {
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wln!(self, ";");
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}
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}
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ModItem::Union(it) => {
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let Union { name, visibility, fields, generic_params, ast_id, types_map } =
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&self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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w!(self, "union {}", name.display(self.db.upcast(), self.edition));
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self.print_generic_params(generic_params, it.into());
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self.print_fields_and_where_clause(
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FieldParent::Union(it),
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FieldsShape::Record,
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fields,
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generic_params,
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types_map,
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);
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wln!(self);
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}
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ModItem::Enum(it) => {
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let Enum { name, visibility, variants, generic_params, ast_id } = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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w!(self, "enum {}", name.display(self.db.upcast(), self.edition));
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self.print_generic_params(generic_params, it.into());
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self.print_where_clause_and_opening_brace(generic_params);
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let edition = self.edition;
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self.indented(|this| {
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for variant in FileItemTreeId::range_iter(variants.clone()) {
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let Variant { name, fields, shape: kind, ast_id, types_map } =
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&this.tree[variant];
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this.print_ast_id(ast_id.erase());
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this.print_attrs_of(variant, "\n");
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w!(this, "{}", name.display(self.db.upcast(), edition));
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this.print_fields(
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FieldParent::EnumVariant(variant),
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*kind,
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fields,
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types_map,
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);
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wln!(this, ",");
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}
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});
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wln!(self, "}}");
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}
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ModItem::Const(it) => {
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let Const { name, visibility, type_ref, ast_id, has_body: _, types_map } =
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&self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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w!(self, "const ");
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match name {
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Some(name) => w!(self, "{}", name.display(self.db.upcast(), self.edition)),
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None => w!(self, "_"),
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}
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w!(self, ": ");
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self.print_type_ref(*type_ref, types_map);
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wln!(self, " = _;");
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}
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ModItem::Static(it) => {
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let Static {
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name,
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visibility,
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mutable,
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type_ref,
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ast_id,
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has_safe_kw,
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has_unsafe_kw,
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types_map,
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} = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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if *has_safe_kw {
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w!(self, "safe ");
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}
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if *has_unsafe_kw {
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w!(self, "unsafe ");
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}
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w!(self, "static ");
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if *mutable {
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w!(self, "mut ");
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}
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w!(self, "{}: ", name.display(self.db.upcast(), self.edition));
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self.print_type_ref(*type_ref, types_map);
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w!(self, " = _;");
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wln!(self);
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}
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ModItem::Trait(it) => {
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let Trait { name, visibility, is_auto, is_unsafe, items, generic_params, ast_id } =
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&self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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if *is_unsafe {
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w!(self, "unsafe ");
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}
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if *is_auto {
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w!(self, "auto ");
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}
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w!(self, "trait {}", name.display(self.db.upcast(), self.edition));
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self.print_generic_params(generic_params, it.into());
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self.print_where_clause_and_opening_brace(generic_params);
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self.indented(|this| {
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for item in &**items {
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this.print_mod_item((*item).into());
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}
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});
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wln!(self, "}}");
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}
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ModItem::TraitAlias(it) => {
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let TraitAlias { name, visibility, generic_params, ast_id } = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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self.print_visibility(*visibility);
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w!(self, "trait {}", name.display(self.db.upcast(), self.edition));
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self.print_generic_params(generic_params, it.into());
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w!(self, " = ");
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self.print_where_clause(generic_params);
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w!(self, ";");
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wln!(self);
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}
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ModItem::Impl(it) => {
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let Impl {
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target_trait,
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self_ty,
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is_negative,
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is_unsafe,
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items,
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generic_params,
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ast_id,
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types_map,
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} = &self.tree[it];
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self.print_ast_id(ast_id.erase());
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if *is_unsafe {
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w!(self, "unsafe");
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}
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w!(self, "impl");
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self.print_generic_params(generic_params, it.into());
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w!(self, " ");
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if *is_negative {
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w!(self, "!");
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}
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if let Some(tr) = target_trait {
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self.print_path(&types_map[tr.path], types_map);
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w!(self, " for ");
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}
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self.print_type_ref(*self_ty, types_map);
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self.print_where_clause_and_opening_brace(generic_params);
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self.indented(|this| {
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for item in &**items {
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this.print_mod_item((*item).into());
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}
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});
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wln!(self, "}}");
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}
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ModItem::TypeAlias(it) => {
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let TypeAlias {
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name,
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visibility,
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bounds,
|
|
type_ref,
|
|
generic_params,
|
|
ast_id,
|
|
types_map,
|
|
} = &self.tree[it];
|
|
self.print_ast_id(ast_id.erase());
|
|
self.print_visibility(*visibility);
|
|
w!(self, "type {}", name.display(self.db.upcast(), self.edition));
|
|
self.print_generic_params(generic_params, it.into());
|
|
if !bounds.is_empty() {
|
|
w!(self, ": ");
|
|
self.print_type_bounds(bounds, types_map);
|
|
}
|
|
if let Some(ty) = type_ref {
|
|
w!(self, " = ");
|
|
self.print_type_ref(*ty, types_map);
|
|
}
|
|
self.print_where_clause(generic_params);
|
|
w!(self, ";");
|
|
wln!(self);
|
|
}
|
|
ModItem::Mod(it) => {
|
|
let Mod { name, visibility, kind, ast_id } = &self.tree[it];
|
|
self.print_ast_id(ast_id.erase());
|
|
self.print_visibility(*visibility);
|
|
w!(self, "mod {}", name.display(self.db.upcast(), self.edition));
|
|
match kind {
|
|
ModKind::Inline { items } => {
|
|
w!(self, " {{");
|
|
self.indented(|this| {
|
|
for item in &**items {
|
|
this.print_mod_item(*item);
|
|
}
|
|
});
|
|
wln!(self, "}}");
|
|
}
|
|
ModKind::Outline => {
|
|
wln!(self, ";");
|
|
}
|
|
}
|
|
}
|
|
ModItem::MacroCall(it) => {
|
|
let MacroCall { path, ast_id, expand_to, ctxt } = &self.tree[it];
|
|
let _ = writeln!(
|
|
self,
|
|
"// AstId: {:?}, SyntaxContextId: {}, ExpandTo: {:?}",
|
|
ast_id.erase().into_raw(),
|
|
ctxt,
|
|
expand_to
|
|
);
|
|
wln!(self, "{}!(...);", path.display(self.db.upcast(), self.edition));
|
|
}
|
|
ModItem::MacroRules(it) => {
|
|
let MacroRules { name, ast_id } = &self.tree[it];
|
|
self.print_ast_id(ast_id.erase());
|
|
wln!(
|
|
self,
|
|
"macro_rules! {} {{ ... }}",
|
|
name.display(self.db.upcast(), self.edition)
|
|
);
|
|
}
|
|
ModItem::Macro2(it) => {
|
|
let Macro2 { name, visibility, ast_id } = &self.tree[it];
|
|
self.print_ast_id(ast_id.erase());
|
|
self.print_visibility(*visibility);
|
|
wln!(self, "macro {} {{ ... }}", name.display(self.db.upcast(), self.edition));
|
|
}
|
|
}
|
|
|
|
self.blank();
|
|
}
|
|
|
|
fn print_type_ref(&mut self, type_ref: TypeRefId, map: &TypesMap) {
|
|
let edition = self.edition;
|
|
print_type_ref(self.db, type_ref, map, self, edition).unwrap();
|
|
}
|
|
|
|
fn print_type_bounds(&mut self, bounds: &[TypeBound], map: &TypesMap) {
|
|
let edition = self.edition;
|
|
print_type_bounds(self.db, bounds, map, self, edition).unwrap();
|
|
}
|
|
|
|
fn print_path(&mut self, path: &Path, map: &TypesMap) {
|
|
let edition = self.edition;
|
|
print_path(self.db, path, map, self, edition).unwrap();
|
|
}
|
|
|
|
fn print_generic_params(&mut self, params: &GenericParams, parent: GenericModItem) {
|
|
if params.is_empty() {
|
|
return;
|
|
}
|
|
|
|
w!(self, "<");
|
|
let mut first = true;
|
|
for (idx, lt) in params.iter_lt() {
|
|
if !first {
|
|
w!(self, ", ");
|
|
}
|
|
first = false;
|
|
self.print_attrs_of(AttrOwner::LifetimeParamData(parent, idx), " ");
|
|
w!(self, "{}", lt.name.display(self.db.upcast(), self.edition));
|
|
}
|
|
for (idx, x) in params.iter_type_or_consts() {
|
|
if !first {
|
|
w!(self, ", ");
|
|
}
|
|
first = false;
|
|
self.print_attrs_of(AttrOwner::TypeOrConstParamData(parent, idx), " ");
|
|
match x {
|
|
TypeOrConstParamData::TypeParamData(ty) => match &ty.name {
|
|
Some(name) => w!(self, "{}", name.display(self.db.upcast(), self.edition)),
|
|
None => w!(self, "_anon_{}", idx.into_raw()),
|
|
},
|
|
TypeOrConstParamData::ConstParamData(konst) => {
|
|
w!(self, "const {}: ", konst.name.display(self.db.upcast(), self.edition));
|
|
self.print_type_ref(konst.ty, ¶ms.types_map);
|
|
}
|
|
}
|
|
}
|
|
w!(self, ">");
|
|
}
|
|
|
|
fn print_where_clause_and_opening_brace(&mut self, params: &GenericParams) {
|
|
if self.print_where_clause(params) {
|
|
w!(self, "\n{{");
|
|
} else {
|
|
self.whitespace();
|
|
w!(self, "{{");
|
|
}
|
|
}
|
|
|
|
fn print_where_clause(&mut self, params: &GenericParams) -> bool {
|
|
if params.where_predicates().next().is_none() {
|
|
return false;
|
|
}
|
|
|
|
w!(self, "\nwhere");
|
|
let edition = self.edition;
|
|
self.indented(|this| {
|
|
for (i, pred) in params.where_predicates().enumerate() {
|
|
if i != 0 {
|
|
wln!(this, ",");
|
|
}
|
|
|
|
let (target, bound) = match pred {
|
|
WherePredicate::TypeBound { target, bound } => (target, bound),
|
|
WherePredicate::Lifetime { target, bound } => {
|
|
w!(
|
|
this,
|
|
"{}: {}",
|
|
target.name.display(self.db.upcast(), edition),
|
|
bound.name.display(self.db.upcast(), edition)
|
|
);
|
|
continue;
|
|
}
|
|
WherePredicate::ForLifetime { lifetimes, target, bound } => {
|
|
w!(this, "for<");
|
|
for (i, lt) in lifetimes.iter().enumerate() {
|
|
if i != 0 {
|
|
w!(this, ", ");
|
|
}
|
|
w!(this, "{}", lt.display(self.db.upcast(), edition));
|
|
}
|
|
w!(this, "> ");
|
|
(target, bound)
|
|
}
|
|
};
|
|
|
|
match target {
|
|
WherePredicateTypeTarget::TypeRef(ty) => {
|
|
this.print_type_ref(*ty, ¶ms.types_map)
|
|
}
|
|
WherePredicateTypeTarget::TypeOrConstParam(id) => match params[*id].name() {
|
|
Some(name) => w!(this, "{}", name.display(self.db.upcast(), edition)),
|
|
None => w!(this, "_anon_{}", id.into_raw()),
|
|
},
|
|
}
|
|
w!(this, ": ");
|
|
this.print_type_bounds(std::slice::from_ref(bound), ¶ms.types_map);
|
|
}
|
|
});
|
|
true
|
|
}
|
|
|
|
fn print_ast_id(&mut self, ast_id: ErasedFileAstId) {
|
|
wln!(self, "// AstId: {:?}", ast_id.into_raw());
|
|
}
|
|
}
|
|
|
|
impl Write for Printer<'_> {
|
|
fn write_str(&mut self, s: &str) -> fmt::Result {
|
|
for line in s.split_inclusive('\n') {
|
|
if self.needs_indent {
|
|
match self.buf.chars().last() {
|
|
Some('\n') | None => {}
|
|
_ => self.buf.push('\n'),
|
|
}
|
|
self.buf.push_str(&" ".repeat(self.indent_level));
|
|
self.needs_indent = false;
|
|
}
|
|
|
|
self.buf.push_str(line);
|
|
self.needs_indent = line.ends_with('\n');
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|