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// -*- coding: utf-8 -*-
// ------------------------------------------------------------------------------------------------
// Copyright © 2021, stack-graphs authors.
// Licensed under either of Apache License, Version 2.0, or MIT license, at your option.
// Please see the LICENSE-APACHE or LICENSE-MIT files in this distribution for license details.
// ------------------------------------------------------------------------------------------------
//! Defines the structure of a stack graph.
//!
//! This module contains all of the types that you need to define the structure of a particular
//! stack graph.
//!
//! The stack graph as a whole lives in an instance of [`StackGraph`][]. This type contains
//! several [`Arena`s][`Arena`], which are used to manage the life cycle of the data instances that
//! comprise the stack graph. You cannot delete anything from the stack graph; all of its contents
//! are dropped in a single operation when the graph itself is dropped.
//!
//! [`Arena`]: ../arena/struct.Arena.html
//! [`StackGraph`]: struct.StackGraph.html
//!
//! There are several different kinds of node that can appear in a stack graph. As we search for a
//! path representing a name binding, each kind of node has different rules for how it interacts
//! with the symbol and scope stacks:
//!
//! - the singleton [_root node_][`RootNode`], which allows name binding paths to cross between
//! files
//! - [_scope_][`ScopeNode`] nodes, which define the name binding structure within a single file
//! - [_push symbol_][`PushSymbolNode`] and [_push scoped symbol_][`PushScopedSymbolNode`] nodes,
//! which push onto the symbol stack new things for us to look for
//! - [_pop symbol_][`PopSymbolNode`] and [_pop scoped symbol_][`PopScopedSymbolNode`] nodes,
//! which pop things off the symbol stack once they've been found
//! - [_drop scopes_][`DropScopesNode`] and [_jump to scope_][`JumpToNode`] nodes, which
//! manipulate the scope stack
//!
//! [`DropScopesNode`]: struct.DropScopesNode.html
//! [`JumpToNode`]: struct.JumpToNode.html
//! [`PushScopedSymbolNode`]: struct.PushScopedSymbolNode.html
//! [`PushSymbolNode`]: struct.PushSymbolNode.html
//! [`PopScopedSymbolNode`]: struct.PopScopedSymbolNode.html
//! [`PopSymbolNode`]: struct.PopSymbolNode.html
//! [`RootNode`]: struct.RootNode.html
//! [`ScopeNode`]: struct.ScopeNode.html
//!
//! All nodes except for the singleton _root node_ and _jump to scope_ node belong to
//! [files][`File`].
//!
//! Nodes are connected via [edges][`Edge`].
//!
//! [`Edge`]: struct.Edge.html
//! [`File`]: struct.File.html
use std::collections::HashMap;
use std::fmt::Display;
use std::num::NonZeroU32;
use std::ops::Index;
use std::ops::IndexMut;
use controlled_option::ControlledOption;
use either::Either;
use fxhash::FxHashMap;
use smallvec::SmallVec;
use crate::arena::Arena;
use crate::arena::Handle;
use crate::arena::SupplementalArena;
//-------------------------------------------------------------------------------------------------
// String content
#[repr(C)]
struct InternedStringContent {
// See InternedStringArena below for how we fill in these fields safely.
start: *const u8,
len: usize,
}
const INITIAL_STRING_CAPACITY: usize = 512;
/// The content of each interned string is stored in one of the buffers inside of a
/// `InternedStringArena` instance, following the trick [described by Aleksey Kladov][interner].
///
/// The buffers stored in this type are preallocated, and are never allowed to grow. That ensures
/// that pointers into the buffer are stable, as long as the buffer has not been destroyed.
/// (`InternedStringContent` instances are also stored in an arena, ensuring that the strings that
/// we hand out don't outlive the buffers.)
///
/// [interner]: https://matklad.github.io/2020/03/22/fast-simple-rust-interner.html
struct InternedStringArena {
current_buffer: Vec<u8>,
full_buffers: Vec<Vec<u8>>,
}
impl InternedStringArena {
fn new() -> InternedStringArena {
InternedStringArena {
current_buffer: Vec::with_capacity(INITIAL_STRING_CAPACITY),
full_buffers: Vec::new(),
}
}
// Adds a new string. This does not check whether we've already stored a string with the same
// content; that is handled down below in `StackGraph::add_symbol` and `add_file`.
fn add(&mut self, value: &str) -> InternedStringContent {
// Is there enough room in current_buffer to hold this string?
let value = value.as_bytes();
let len = value.len();
let capacity = self.current_buffer.capacity();
let remaining_capacity = capacity - self.current_buffer.len();
if len > remaining_capacity {
// If not, move current_buffer over into full_buffers (so that we hang onto it until
// we're dropped) and allocate a new current_buffer that's at least big enough to hold
// this string.
let new_capacity = (capacity.max(len) + 1).next_power_of_two();
let new_buffer = Vec::with_capacity(new_capacity);
let old_buffer = std::mem::replace(&mut self.current_buffer, new_buffer);
self.full_buffers.push(old_buffer);
}
// Copy the string's content into current_buffer and return a pointer to it. That pointer
// is stable since we never allow the current_buffer to be resized — once we run out of
// room, we allocate a _completely new buffer_ to replace it.
let start_index = self.current_buffer.len();
self.current_buffer.extend_from_slice(value);
let start = unsafe { self.current_buffer.as_ptr().add(start_index) };
InternedStringContent { start, len }
}
}
impl InternedStringContent {
/// Returns the content of this string as a `str`. This is safe as long as the lifetime of the
/// InternedStringContent is outlived by the lifetime of the InternedStringArena that holds its
/// data. That is guaranteed because we store the InternedStrings in an Arena alongside the
/// InternedStringArena, and only hand out references to them.
fn as_str(&self) -> &str {
unsafe {
let bytes = std::slice::from_raw_parts(self.start, self.len);
std::str::from_utf8_unchecked(bytes)
}
}
// Returns a supposedly 'static reference to the string's data. The string data isn't really
// static, but we are careful only to use this as a key in the HashMap that StackGraph uses to
// track whether we've stored a particular symbol already. That HashMap lives alongside the
// InternedStringArena that holds the data, so we can get away with a technically incorrect
// 'static lifetime here. As an extra precaution, this method is is marked as unsafe so that
// we don't inadvertently call it from anywhere else in the crate.
unsafe fn as_hash_key(&self) -> &'static str {
let bytes = std::slice::from_raw_parts(self.start, self.len);
std::str::from_utf8_unchecked(bytes)
}
}
unsafe impl Send for InternedStringContent {}
unsafe impl Sync for InternedStringContent {}
//-------------------------------------------------------------------------------------------------
// Symbols
/// A name that we are trying to resolve using stack graphs.
///
/// This typically represents a portion of an identifier as it appears in the source language. It
/// can also represent some other "operation" that can occur in source code, and which needs to be
/// modeled in a stack graph — for instance, many languages will use a "fake" symbol named `.` to
/// represent member access.
///
/// We deduplicate `Symbol` instances in a `StackGraph` — that is, we ensure that there are never
/// multiple `Symbol` instances with the same content. That means that you can compare _handles_
/// to symbols using simple equality, without having to dereference into the `StackGraph` arena.
#[repr(C)]
pub struct Symbol {
content: InternedStringContent,
}
impl Symbol {
pub fn as_str(&self) -> &str {
self.content.as_str()
}
}
impl PartialEq<&str> for Symbol {
fn eq(&self, other: &&str) -> bool {
self.as_str() == *other
}
}
impl StackGraph {
/// Adds a symbol to the stack graph, ensuring that there's only ever one copy of a particular
/// symbol stored in the graph.
pub fn add_symbol<S: AsRef<str> + ?Sized>(&mut self, symbol: &S) -> Handle<Symbol> {
let symbol = symbol.as_ref();
if let Some(handle) = self.symbol_handles.get(symbol) {
return *handle;
}
let interned = self.interned_strings.add(symbol);
let hash_key = unsafe { interned.as_hash_key() };
let handle = self.symbols.add(Symbol { content: interned });
self.symbol_handles.insert(hash_key, handle);
handle
}
/// Returns an iterator over all of the handles of all of the symbols in this stack graph.
/// (Note that because we're only returning _handles_, this iterator does not retain a
/// reference to the `StackGraph`.)
pub fn iter_symbols(&self) -> impl Iterator<Item = Handle<Symbol>> {
self.symbols.iter_handles()
}
}
impl Index<Handle<Symbol>> for StackGraph {
type Output = str;
#[inline(always)]
fn index(&self, handle: Handle<Symbol>) -> &str {
self.symbols.get(handle).as_str()
}
}
#[doc(hidden)]
pub struct DisplaySymbol<'a> {
wrapped: Handle<Symbol>,
graph: &'a StackGraph,
}
impl<'a> Display for DisplaySymbol<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", &self.graph[self.wrapped])
}
}
impl Handle<Symbol> {
pub fn display(self, graph: &StackGraph) -> impl Display + '_ {
DisplaySymbol {
wrapped: self,
graph,
}
}
}
//-------------------------------------------------------------------------------------------------
// Interned strings
/// Arbitrary string content associated with some part of a stack graph.
#[repr(C)]
pub struct InternedString {
content: InternedStringContent,
}
impl InternedString {
fn as_str(&self) -> &str {
self.content.as_str()
}
}
impl PartialEq<&str> for InternedString {
fn eq(&self, other: &&str) -> bool {
self.as_str() == *other
}
}
impl StackGraph {
/// Adds an interned string to the stack graph, ensuring that there's only ever one copy of a
/// particular string stored in the graph.
pub fn add_string<S: AsRef<str> + ?Sized>(&mut self, string: &S) -> Handle<InternedString> {
let string = string.as_ref();
if let Some(handle) = self.string_handles.get(string) {
return *handle;
}
let interned = self.interned_strings.add(string);
let hash_key = unsafe { interned.as_hash_key() };
let handle = self.strings.add(InternedString { content: interned });
self.string_handles.insert(hash_key, handle);
handle
}
/// Returns an iterator over all of the handles of all of the interned strings in this stack
/// graph. (Note that because we're only returning _handles_, this iterator does not retain a
/// reference to the `StackGraph`.)
pub fn iter_strings(&self) -> impl Iterator<Item = Handle<InternedString>> {
self.strings.iter_handles()
}
}
impl Index<Handle<InternedString>> for StackGraph {
type Output = str;
#[inline(always)]
fn index(&self, handle: Handle<InternedString>) -> &str {
self.strings.get(handle).as_str()
}
}
#[doc(hidden)]
pub struct DisplayInternedString<'a> {
wrapped: Handle<InternedString>,
graph: &'a StackGraph,
}
impl<'a> Display for DisplayInternedString<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", &self.graph[self.wrapped])
}
}
impl Handle<InternedString> {
pub fn display(self, graph: &StackGraph) -> impl Display + '_ {
DisplayInternedString {
wrapped: self,
graph,
}
}
}
//-------------------------------------------------------------------------------------------------
// Files
/// A source file that we have extracted stack graph data from.
///
/// It's up to you to choose what names to use for your files, but they must be unique within a
/// stack graph. If you are analyzing files from the local filesystem, the file's path is a good
/// choice. If your files belong to packages or repositories, they should include the package or
/// repository IDs to make sure that files in different packages or repositories don't clash with
/// each other.
pub struct File {
/// The name of this source file.
name: InternedStringContent,
}
impl File {
pub fn name(&self) -> &str {
self.name.as_str()
}
}
impl StackGraph {
/// Adds a file to the stack graph. There can only ever be one file with a particular name in
/// the graph. If a file with the requested name already exists, we return `Err`; if it
/// doesn't already exist, we return `Ok`. In both cases, the value of the result is the
/// file's handle.
pub fn add_file<S: AsRef<str> + ?Sized>(
&mut self,
name: &S,
) -> Result<Handle<File>, Handle<File>> {
let name = name.as_ref();
if let Some(handle) = self.file_handles.get(name) {
return Err(*handle);
}
let interned = self.interned_strings.add(name);
let hash_key = unsafe { interned.as_hash_key() };
let handle = self.files.add(File { name: interned });
self.file_handles.insert(hash_key, handle);
Ok(handle)
}
/// Adds a file to the stack graph, returning its handle. There can only ever be one file with
/// a particular name in the graph, so if you call this multiple times with the same name,
/// you'll get the same handle each time.
#[inline(always)]
pub fn get_or_create_file<S: AsRef<str> + ?Sized>(&mut self, name: &S) -> Handle<File> {
self.add_file(name).unwrap_or_else(|handle| handle)
}
/// Returns the file with a particular name, if it exists.
pub fn get_file<S: AsRef<str> + ?Sized>(&self, name: &S) -> Option<Handle<File>> {
let name = name.as_ref();
self.file_handles.get(name).copied()
}
}
impl StackGraph {
/// Returns an iterator of all of the nodes that belong to a particular file. Note that this
/// does **_not_** include the singleton _root_ or _jump to scope_ nodes.
pub fn nodes_for_file(&self, file: Handle<File>) -> impl Iterator<Item = Handle<Node>> + '_ {
self.node_id_handles.nodes_for_file(file)
}
/// Returns an iterator over all of the handles of all of the files in this stack graph. (Note
/// that because we're only returning _handles_, this iterator does not retain a reference to
/// the `StackGraph`.)
pub fn iter_files(&self) -> impl Iterator<Item = Handle<File>> + '_ {
self.files.iter_handles()
}
}
impl Display for File {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", self.name())
}
}
impl Index<Handle<File>> for StackGraph {
type Output = File;
#[inline(always)]
fn index(&self, handle: Handle<File>) -> &File {
&self.files.get(handle)
}
}
#[doc(hidden)]
pub struct DisplayFile<'a> {
wrapped: Handle<File>,
graph: &'a StackGraph,
}
impl<'a> Display for DisplayFile<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", self.graph[self.wrapped])
}
}
impl Handle<File> {
pub fn display(self, graph: &StackGraph) -> impl Display + '_ {
DisplayFile {
wrapped: self,
graph,
}
}
}
//-------------------------------------------------------------------------------------------------
// Nodes
/// Uniquely identifies a node in a stack graph.
///
/// Each node (except for the _root node_ and _jump to scope_ node) lives in a file, and has a
/// _local ID_ that must be unique within its file.
#[repr(C)]
#[derive(Clone, Copy, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct NodeID {
file: ControlledOption<Handle<File>>,
local_id: u32,
}
pub(crate) const ROOT_NODE_ID: u32 = 1;
pub(crate) const JUMP_TO_NODE_ID: u32 = 2;
impl NodeID {
/// Returns the ID of the singleton _root node_.
#[inline(always)]
pub fn root() -> NodeID {
NodeID {
file: ControlledOption::none(),
local_id: ROOT_NODE_ID,
}
}
/// Returns the ID of the singleton _jump to scope_ node.
#[inline(always)]
pub fn jump_to() -> NodeID {
NodeID {
file: ControlledOption::none(),
local_id: JUMP_TO_NODE_ID,
}
}
/// Creates a new file-local node ID.
#[inline(always)]
pub fn new_in_file(file: Handle<File>, local_id: u32) -> NodeID {
NodeID {
file: ControlledOption::some(file),
local_id,
}
}
/// Returns whether this ID refers to the singleton _root node_.
#[inline(always)]
pub fn is_root(self) -> bool {
self.file.is_none() && self.local_id == ROOT_NODE_ID
}
/// Returns whether this ID refers to the singleton _jump to scope_ node.
#[inline(always)]
pub fn is_jump_to(self) -> bool {
self.file.is_none() && self.local_id == JUMP_TO_NODE_ID
}
/// Returns the file that this node belongs to. Returns `None` for the singleton _root_ and
/// _jump to scope_ nodes, which belong to all files.
#[inline(always)]
pub fn file(self) -> Option<Handle<File>> {
self.file.into()
}
/// Returns the local ID of this node within its file. Panics if this node ID refers to the
/// singleton _root_ or _jump to scope_ nodes.
#[inline(always)]
pub fn local_id(self) -> u32 {
self.local_id
}
/// Returns whether this node belongs to a particular file. Always returns `true` for the
/// singleton _root_ and _jump to scope_ nodes, which belong to all files.
#[inline(always)]
pub fn is_in_file(self, file: Handle<File>) -> bool {
match self.file.into_option() {
Some(this_file) => this_file == file,
_ => true,
}
}
}
#[doc(hidden)]
pub struct DisplayNodeID<'a> {
wrapped: NodeID,
graph: &'a StackGraph,
}
impl<'a> Display for DisplayNodeID<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self.wrapped.file.into_option() {
Some(file) => write!(f, "{}({})", file.display(self.graph), self.wrapped.local_id),
None => {
if self.wrapped.is_root() {
write!(f, "[root]")
} else if self.wrapped.is_jump_to() {
write!(f, "[jump]")
} else {
unreachable!();
}
}
}
}
}
impl NodeID {
pub fn display(self, graph: &StackGraph) -> impl Display + '_ {
DisplayNodeID {
wrapped: self,
graph,
}
}
}
/// A node in a stack graph.
#[repr(C)]
pub enum Node {
DropScopes(DropScopesNode),
JumpTo(JumpToNode),
PopScopedSymbol(PopScopedSymbolNode),
PopSymbol(PopSymbolNode),
PushScopedSymbol(PushScopedSymbolNode),
PushSymbol(PushSymbolNode),
Root(RootNode),
Scope(ScopeNode),
}
impl Node {
#[inline(always)]
pub fn is_exported_scope(&self) -> bool {
match self {
Node::Scope(node) => node.is_exported,
_ => false,
}
}
#[inline(always)]
pub fn is_definition(&self) -> bool {
match self {
Node::PopScopedSymbol(node) => node.is_definition,
Node::PopSymbol(node) => node.is_definition,
_ => false,
}
}
#[inline(always)]
pub fn is_reference(&self) -> bool {
match self {
Node::PushScopedSymbol(node) => node.is_reference,
Node::PushSymbol(node) => node.is_reference,
_ => false,
}
}
#[inline(always)]
pub fn is_jump_to(&self) -> bool {
matches!(self, Node::JumpTo(_))
}
#[inline(always)]
pub fn is_root(&self) -> bool {
matches!(self, Node::Root(_))
}
#[inline(always)]
pub fn is_endpoint(&self) -> bool {
self.is_definition() || self.is_exported_scope() || self.is_reference() || self.is_root()
}
/// Returns this node's symbol, if it has one. (_Pop symbol_, _pop scoped symbol_, _push
/// symbol_, and _push scoped symbol_ nodes have symbols.)
pub fn symbol(&self) -> Option<Handle<Symbol>> {
match self {
Node::PushScopedSymbol(node) => Some(node.symbol),
Node::PushSymbol(node) => Some(node.symbol),
Node::PopScopedSymbol(node) => Some(node.symbol),
Node::PopSymbol(node) => Some(node.symbol),
_ => None,
}
}
/// Returns this node's attached scope, if it has one. (_Push scoped symbol_ nodes have
/// attached scopes.)
pub fn scope(&self) -> Option<NodeID> {
match self {
Node::PushScopedSymbol(node) => Some(node.scope),
_ => None,
}
}
/// Returns the ID of this node.
pub fn id(&self) -> NodeID {
match self {
Node::DropScopes(node) => node.id,
Node::JumpTo(node) => node.id,
Node::PushScopedSymbol(node) => node.id,
Node::PushSymbol(node) => node.id,
Node::PopScopedSymbol(node) => node.id,
Node::PopSymbol(node) => node.id,
Node::Root(node) => node.id,
Node::Scope(node) => node.id,
}
}
/// Returns the file that this node belongs to. Returns `None` for the singleton _root_ and
/// _jump to scope_ nodes, which belong to all files.
#[inline(always)]
pub fn file(&self) -> Option<Handle<File>> {
self.id().file()
}
/// Returns whether this node belongs to a particular file. Always returns `true` for the
/// singleton _root_ and _jump to scope_ nodes, which belong to all files.
#[inline(always)]
pub fn is_in_file(&self, file: Handle<File>) -> bool {
self.id().is_in_file(file)
}
pub fn display<'a>(&'a self, graph: &'a StackGraph) -> impl Display + 'a {
DisplayNode {
wrapped: self,
graph,
}
}
}
impl StackGraph {
/// Returns a handle to the stack graph's singleton _jump to scope_ node.
#[inline(always)]
pub fn jump_to_node() -> Handle<Node> {
Handle::new(unsafe { NonZeroU32::new_unchecked(2) })
}
/// Returns a handle to the stack graph's singleton _root node_.
#[inline(always)]
pub fn root_node() -> Handle<Node> {
Handle::new(unsafe { NonZeroU32::new_unchecked(1) })
}
/// Returns an unused [`NodeID`][] for the given file.
///
/// [`NodeID`]: struct.NodeID.html
pub fn new_node_id(&mut self, file: Handle<File>) -> NodeID {
self.node_id_handles.unused_id(file)
}
/// Returns an iterator of all of the nodes in the graph. (Note that because we're only
/// returning _handles_, this iterator does not retain a reference to the `StackGraph`.)
pub fn iter_nodes(&self) -> impl Iterator<Item = Handle<Node>> {
self.nodes.iter_handles()
}
/// Returns the handle to the node with a particular ID, if it exists.
pub fn node_for_id(&self, id: NodeID) -> Option<Handle<Node>> {
if id.file().is_some() {
self.node_id_handles.try_handle_for_id(id)
} else if id.is_root() {
Some(StackGraph::root_node())
} else if id.is_jump_to() {
Some(StackGraph::jump_to_node())
} else {
None
}
}
pub(crate) fn add_node(&mut self, id: NodeID, node: Node) -> Option<Handle<Node>> {
if let Some(_) = self.node_id_handles.handle_for_id(id) {
return None;
}
let handle = self.nodes.add(node);
self.node_id_handles.set_handle_for_id(id, handle);
Some(handle)
}
pub(crate) fn get_or_create_node(&mut self, id: NodeID, node: Node) -> Handle<Node> {
if let Some(handle) = self.node_id_handles.handle_for_id(id) {
return handle;
}
let handle = self.nodes.add(node);
self.node_id_handles.set_handle_for_id(id, handle);
handle
}
}
#[doc(hidden)]
pub struct DisplayNode<'a> {
wrapped: &'a Node,
graph: &'a StackGraph,
}
impl<'a> Display for DisplayNode<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self.wrapped {
Node::DropScopes(node) => node.display(self.graph).fmt(f),
Node::JumpTo(node) => node.fmt(f),
Node::PushScopedSymbol(node) => node.display(self.graph).fmt(f),
Node::PushSymbol(node) => node.display(self.graph).fmt(f),
Node::PopScopedSymbol(node) => node.display(self.graph).fmt(f),
Node::PopSymbol(node) => node.display(self.graph).fmt(f),
Node::Root(node) => node.fmt(f),
Node::Scope(node) => node.display(self.graph).fmt(f),
}
}
}
impl Handle<Node> {
pub fn display(self, graph: &StackGraph) -> impl Display + '_ {
DisplayNode {
wrapped: &graph[self],
graph,
}
}
}
impl Index<Handle<Node>> for StackGraph {
type Output = Node;
#[inline(always)]
fn index(&self, handle: Handle<Node>) -> &Node {
self.nodes.get(handle)
}
}
impl IndexMut<Handle<Node>> for StackGraph {
#[inline(always)]
fn index_mut(&mut self, handle: Handle<Node>) -> &mut Node {
self.nodes.get_mut(handle)
}
}
/// Removes everything from the current scope stack.
#[repr(C)]
pub struct DropScopesNode {
/// The unique identifier for this node.
pub id: NodeID,
_symbol: ControlledOption<Handle<Symbol>>,
_scope: NodeID,
_is_endpoint: bool,
}
impl From<DropScopesNode> for Node {
fn from(node: DropScopesNode) -> Node {
Node::DropScopes(node)
}
}
impl StackGraph {
/// Adds a _drop scopes_ node to the stack graph.
pub fn add_drop_scopes_node(&mut self, id: NodeID) -> Option<Handle<Node>> {
let node = DropScopesNode {
id,
_symbol: ControlledOption::none(),
_scope: NodeID::default(),
_is_endpoint: false,
};
self.add_node(id, node.into())
}
}
impl DropScopesNode {
pub fn display<'a>(&'a self, graph: &'a StackGraph) -> impl Display + 'a {
DisplayDropScopesNode {
wrapped: self,
graph,
}
}
}
#[doc(hidden)]
pub struct DisplayDropScopesNode<'a> {
wrapped: &'a DropScopesNode,
graph: &'a StackGraph,
}
impl<'a> Display for DisplayDropScopesNode<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
if f.alternate() {
write!(f, "[{}]", self.wrapped.id.display(self.graph))
} else {
write!(f, "[{} drop scopes]", self.wrapped.id.display(self.graph))
}
}
}
/// The singleton "jump to" node, which allows a name binding path to jump back to another part of
/// the graph.
#[repr(C)]
pub struct JumpToNode {
id: NodeID,
_symbol: ControlledOption<Handle<Symbol>>,
_scope: NodeID,
_is_endpoint: bool,
}
impl From<JumpToNode> for Node {
fn from(node: JumpToNode) -> Node {
Node::JumpTo(node)
}
}
impl JumpToNode {
fn new() -> JumpToNode {
JumpToNode {
id: NodeID::jump_to(),
_symbol: ControlledOption::none(),
_scope: NodeID::default(),
_is_endpoint: false,
}
}
}
impl Display for JumpToNode {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "[jump to scope]")
}
}
/// Pops a scoped symbol from the symbol stack. If the top of the symbol stack doesn't match the
/// requested symbol, or if the top of the symbol stack doesn't have an attached scope list, then
/// the path is not allowed to enter this node.
#[repr(C)]
pub struct PopScopedSymbolNode {
/// The unique identifier for this node.
pub id: NodeID,
/// The symbol to pop off the symbol stack.
pub symbol: Handle<Symbol>,
_scope: NodeID,
/// Whether this node represents a reference in the source language.
pub is_definition: bool,
}
impl From<PopScopedSymbolNode> for Node {
fn from(node: PopScopedSymbolNode) -> Node {
Node::PopScopedSymbol(node)
}
}
impl StackGraph {
/// Adds a _pop scoped symbol_ node to the stack graph.
pub fn add_pop_scoped_symbol_node(
&mut self,
id: NodeID,
symbol: Handle<Symbol>,
is_definition: bool,
) -> Option<Handle<Node>> {
let node = PopScopedSymbolNode {
id,
symbol,
_scope: NodeID::default(),
is_definition,
};
self.add_node(id, node.into())
}
}
impl PopScopedSymbolNode {
pub fn display<'a>(&'a self, graph: &'a StackGraph) -> impl Display + 'a {
DisplayPopScopedSymbolNode {
wrapped: self,
graph,
}
}
}
#[doc(hidden)]
pub struct DisplayPopScopedSymbolNode<'a> {
wrapped: &'a PopScopedSymbolNode,
graph: &'a StackGraph,
}
impl<'a> Display for DisplayPopScopedSymbolNode<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
if f.alternate() {
write!(f, "[{}]", self.wrapped.id.display(self.graph))
} else {
write!(
f,
"[{} {} {}]",
self.wrapped.id.display(self.graph),
if self.wrapped.is_definition {
"scoped definition"
} else {
"pop scoped"
},
self.wrapped.symbol.display(self.graph),
)
}
}
}
/// Pops a symbol from the symbol stack. If the top of the symbol stack doesn't match the
/// requested symbol, then the path is not allowed to enter this node.
#[repr(C)]
pub struct PopSymbolNode {
/// The unique identifier for this node.
pub id: NodeID,
/// The symbol to pop off the symbol stack.
pub symbol: Handle<Symbol>,
_scope: NodeID,
/// Whether this node represents a reference in the source language.
pub is_definition: bool,
}
impl From<PopSymbolNode> for Node {
fn from(node: PopSymbolNode) -> Node {
Node::PopSymbol(node)
}
}
impl StackGraph {
/// Adds a _pop symbol_ node to the stack graph.
pub fn add_pop_symbol_node(
&mut self,
id: NodeID,
symbol: Handle<Symbol>,
is_definition: bool,
) -> Option<Handle<Node>> {
let node = PopSymbolNode {
id,
symbol,
_scope: NodeID::default(),
is_definition,
};
self.add_node(id, node.into())
}
}
impl PopSymbolNode {
pub fn display<'a>(&'a self, graph: &'a StackGraph) -> impl Display + 'a {
DisplayPopSymbolNode {
wrapped: self,
graph,
}
}
}
#[doc(hidden)]
pub struct DisplayPopSymbolNode<'a> {
wrapped: &'a PopSymbolNode,
graph: &'a StackGraph,
}
impl<'a> Display for DisplayPopSymbolNode<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
if f.alternate() {
write!(f, "[{}]", self.wrapped.id.display(self.graph))
} else {
write!(
f,
"[{} {} {}]",
self.wrapped.id.display(self.graph),
if self.wrapped.is_definition {
"definition"
} else {
"pop"
},
self.wrapped.symbol.display(self.graph),
)
}
}
}
/// Pushes a scoped symbol onto the symbol stack.
#[repr(C)]
pub struct PushScopedSymbolNode {
/// The unique identifier for this node.
pub id: NodeID,
/// The symbol to push onto the symbol stack.
pub symbol: Handle<Symbol>,
/// The exported scope node that should be attached to the scoped symbol. The node ID must
/// refer to an exported scope node.
pub scope: NodeID,
/// Whether this node represents a reference in the source language.
pub is_reference: bool,
_phantom: (),
}
impl From<PushScopedSymbolNode> for Node {
fn from(node: PushScopedSymbolNode) -> Node {
Node::PushScopedSymbol(node)
}
}