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use std::collections::HashMap;
use crate::constants::v1_0;
use crate::types::SymbolId;
pub struct SymbolTable {
symbols_by_id: Vec<String>,
ids_by_text: HashMap<String, SymbolId>,
}
impl SymbolTable {
pub fn new() -> SymbolTable {
let mut symbol_table = SymbolTable {
symbols_by_id: Vec::with_capacity(v1_0::SYSTEM_SYMBOLS.len()),
ids_by_text: HashMap::new(),
};
symbol_table.initialize();
symbol_table
}
fn initialize(&mut self) {
for (id, text) in v1_0::SYSTEM_SYMBOLS.iter().enumerate() {
self.symbols_by_id.push(text.to_string());
self.ids_by_text.insert(text.to_string(), id);
}
}
pub fn reset(&mut self) {
self.symbols_by_id.clear();
self.ids_by_text.clear();
self.initialize();
}
pub fn intern(&mut self, text: String) -> SymbolId {
if let Some(id) = self.ids_by_text.get(&text) {
return *id;
}
let id = self.symbols_by_id.len();
self.symbols_by_id.push(text.to_string());
self.ids_by_text.insert(text, id);
id
}
pub fn sid_for<A: AsRef<str>>(&self, text: &A) -> Option<SymbolId> {
self.ids_by_text.get(text.as_ref()).copied()
}
pub fn text_for(&self, sid: usize) -> Option<&str> {
self.symbols_by_id.get(sid).map(|text| text.as_str())
}
pub fn symbols(&self) -> &[String] {
&self.symbols_by_id
}
pub fn symbols_tail(&self, start: usize) -> &[String] {
&self.symbols_by_id[start..]
}
pub fn len(&self) -> usize {
self.symbols_by_id.len()
}
}