now workspaces for modular compilation (maybe faster)

rsprocess/src/translator.rs

@@ -0,0 +1,101 @@
+//! Module for translation and keeping track of strings.
+
+use std::collections::HashMap;
+use std::fmt;
+
+use serde::{Deserialize, Serialize};
+
+use super::element::IdType;
+
+/// precision for printing frequencies
+pub static PRECISION: &usize = &2;
+
+/// Structure that keeps track of association string and id. Ids given
+/// sequentially from 0.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Translator {
+    strings: HashMap<String, IdType>,
+    reverse: HashMap<IdType, String>,
+    last_id: IdType,
+}
+
+impl Translator {
+    pub fn new() -> Self {
+        Translator {
+            strings: HashMap::from([("*".into(), 0)]),
+            reverse: HashMap::from([(0, "*".into())]),
+            last_id: 1,
+        }
+    }
+
+    /// converts a string into an id
+    pub fn encode(&mut self, s: impl Into<String>) -> IdType {
+        let s = s.into();
+        let id = *(self.strings.entry(s.clone()).or_insert({
+            self.last_id += 1;
+            self.last_id
+        }));
+        self.reverse.insert(id, s.clone());
+        id
+    }
+
+    pub fn encode_not_mut(&self, s: impl Into<String>) -> Option<IdType> {
+        self.strings.get(&s.into()).copied()
+    }
+
+    /// converts an id into the corresponding string
+    pub fn decode(&self, el: IdType) -> Option<String> {
+        self.reverse.get(&el).map(|x| x.to_string())
+    }
+}
+
+impl Default for Translator {
+    fn default() -> Self {
+        Translator::new()
+    }
+}
+
+impl PartialEq for Translator {
+    fn eq(&self, other: &Self) -> bool {
+        for (s, id) in self.strings.iter() {
+            match other.strings.get(s) {
+                | None => return false,
+                | Some(id2) if id != id2 => return false,
+                | _ => {},
+            }
+        }
+        true
+    }
+}
+
+// -----------------------------------------------------------------------------
+//                              print structures
+// -----------------------------------------------------------------------------
+
+pub trait PrintableWithTranslator {
+    fn print(
+        &self,
+        f: &mut fmt::Formatter,
+        translator: &Translator,
+    ) -> fmt::Result;
+}
+
+pub struct Formatter<'a, T> {
+    data: &'a T,
+    translator: &'a Translator,
+}
+
+impl<'a, T> fmt::Display for Formatter<'a, T>
+where
+    T: PrintableWithTranslator,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.data.print(f, self.translator)
+    }
+}
+
+impl<'a, T> Formatter<'a, T> {
+    pub fn from(translator: &'a Translator, data: &'a T) -> Self {
+        Self { data, translator }
+    }
+}