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use crate::*;
use std::mem::take;
/// Resolve symbol references across source units.
pub struct SymbolResolver {
pub definitions: Vec<TrackedSymbol>,
pub unresolved: Vec<TrackedSymbol>,
/// Contains the ID of the owner of the original definition.
pub redefinitions: Vec<(TrackedSymbol, usize)>,
pub source_units: Vec<HeirarchicalSourceUnit>,
pub root_unit_ids: Vec<usize>,
pub unused_library_units: Vec<SourceUnit>,
}
impl SymbolResolver {
/// Construct a resolver from a root source unit.
pub fn from_source_unit(source_unit: SourceUnit) -> Self {
let mut new = Self {
definitions: Vec::new(),
unresolved: Vec::new(),
redefinitions: Vec::new(),
source_units: Vec::new(),
root_unit_ids: Vec::new(),
unused_library_units: Vec::new(),
};
new.add_source_unit(source_unit, None);
return new;
}
pub fn add_library_units(&mut self, mut source_units: Vec<SourceUnit>) {
self.unused_library_units.append(&mut source_units);
}
pub fn resolve(&mut self) {
// Repeatedly test if any unused source unit resolves an unresolved symbol,
// breaking the loop when no new resolutions are found.
'outer: loop {
for (i, source_unit) in self.unused_library_units.iter().enumerate() {
if let Some(id) = self.resolves_reference(&source_unit) {
let source_unit = self.unused_library_units.remove(i);
self.add_source_unit(source_unit, Some(id));
continue 'outer;
}
}
break;
}
}
/// Add a source unit to the resolver and link it to a parent unit.
pub fn add_source_unit(&mut self, mut source_unit: SourceUnit, parent_id: Option<usize>) {
let source_id = self.source_units.len();
// Add all main symbols.
if let Some(definitions) = take(&mut source_unit.main.symbols.definitions) {
self.add_definitions(definitions, source_id, SourceRole::Main); }
if let Some(references) = take(&mut source_unit.main.symbols.references) {
self.add_references(references, source_id, SourceRole::Main); }
// Add all head symbols.
if let Some(head) = &mut source_unit.head {
if let Some(references) = take(&mut head.symbols.references) {
self.add_references(references, source_id, SourceRole::Head); }
if let Some(definitions) = take(&mut head.symbols.definitions) {
self.add_definitions(definitions, source_id, SourceRole::Head); }
}
// Add all tail symbols.
if let Some(tail) = &mut source_unit.tail {
if let Some(references) = take(&mut tail.symbols.references) {
self.add_references(references, source_id, SourceRole::Tail); }
if let Some(definitions) = take(&mut tail.symbols.definitions) {
self.add_definitions(definitions, source_id, SourceRole::Tail); }
}
if let Some(parent_id) = parent_id {
if let Some(parent_unit) = self.source_units.get_mut(parent_id) {
parent_unit.child_ids.push(source_id);
}
} else {
self.root_unit_ids.push(source_id);
}
let source_unit = HeirarchicalSourceUnit { source_unit, child_ids: Vec::new() };
self.source_units.push(source_unit);
}
fn add_references(&mut self, references: Vec<Symbol>, source_id: usize, source_role: SourceRole) {
for symbol in references {
let reference = TrackedSymbol { symbol, source_id, source_role };
if !self.definitions.contains(&reference) {
self.unresolved.push(reference);
}
}
}
fn add_definitions(&mut self, definitions: Vec<Symbol>, source_id: usize, source_role: SourceRole) {
for symbol in definitions {
let predicate = |d: &&TrackedSymbol| { &d.symbol.name == &symbol.name };
if let Some(def) = self.definitions.iter().find(predicate) {
let definition = TrackedSymbol { symbol, source_id, source_role };
let redefinition = (definition, def.source_id);
self.redefinitions.push(redefinition);
} else {
self.unresolved.retain(|s| s.symbol.name != symbol.name);
let definition = TrackedSymbol { symbol, source_id, source_role };
self.definitions.push(definition);
}
}
}
/// Returns the ID of the owner of a symbol resolved by this unit.
pub fn resolves_reference(&self, source_unit: &SourceUnit) -> Option<usize> {
if let Some(definitions) = &source_unit.main.symbols.definitions {
if let Some(id) = self.source_id_of_unresolved(&definitions) {
return Some(id);
}
}
if let Some(head) = &source_unit.head {
if let Some(definitions) = &head.symbols.definitions {
if let Some(id) = self.source_id_of_unresolved(&definitions) {
return Some(id);
}
}
}
if let Some(tail) = &source_unit.tail {
if let Some(definitions) = &tail.symbols.definitions {
if let Some(id) = self.source_id_of_unresolved(&definitions) {
return Some(id);
}
}
}
return None;
}
/// Returns the ID of the owner of a reference to one of these symbols.
fn source_id_of_unresolved(&self, symbols: &[Symbol]) -> Option<usize> {
for symbol in symbols {
let opt = self.unresolved.iter().find(|s| s.symbol.name == symbol.name);
if let Some(unresolved) = opt {
return Some(unresolved.source_id);
}
}
return None;
}
pub fn get_source_code_for_tracked_symbol(&self, symbol: &TrackedSymbol) -> &str {
let source_unit = &self.source_units[symbol.source_id].source_unit;
match symbol.source_role {
SourceRole::Main => source_unit.main.symbols.source_code.as_str(),
SourceRole::Head => match &source_unit.head {
Some(head) => head.symbols.source_code.as_str(),
None => unreachable!("Failed to find source for token"),
}
SourceRole::Tail => match &source_unit.tail {
Some(tail) => tail.symbols.source_code.as_str(),
None => unreachable!("Failed to find source for token"),
}
}
}
/// Create a source file by concatenating all source units.
pub fn get_merged_source_code(&self) -> String {
// The first source unit is guaranteed to be the root unit, so we can
// just push source files in their current order.
let mut source_code = String::new();
// Push head source code.
for source_unit in self.source_units.iter().rev() {
if let Some(head) = &source_unit.source_unit.head {
push_source_code_to_string(&mut source_code, head);
}
}
// Push main source code.
for source_unit in self.source_units.iter() {
push_source_code_to_string(&mut source_code, &source_unit.source_unit.main);
}
// Push tail source code.
for source_unit in self.source_units.iter().rev() {
if let Some(tail) = &source_unit.source_unit.tail {
push_source_code_to_string(&mut source_code, tail);
}
}
return source_code;
}
}
fn push_source_code_to_string(string: &mut String, source_file: &SourceFile) {
// Ensure that sections are separated by two newlines.
if !string.is_empty() {
if !string.ends_with('\n') { string.push('\n'); }
if !string.ends_with("\n\n") { string.push('\n'); }
}
// Write a path comment to the string.
let path_str = source_file.path.as_os_str().to_string_lossy();
let path_comment = format!("(: {path_str} )\n");
string.push_str(&path_comment);
string.push_str(&source_file.symbols.source_code);
}
pub struct HeirarchicalSourceUnit {
pub source_unit: SourceUnit,
pub child_ids: Vec<usize>,
}
pub struct TrackedSymbol {
pub symbol: Symbol,
pub source_id: usize,
pub source_role: SourceRole,
}
#[derive(Clone, Copy)]
pub enum SourceRole {
Main,
Head,
Tail,
}
impl PartialEq for TrackedSymbol {
fn eq(&self, other: &TrackedSymbol) -> bool {
self.symbol.name.eq(&other.symbol.name)
}
}
|
