comments

automerge-wasm/src/lib.rs

@@ -1,6 +1,6 @@
 extern crate web_sys;
 use automerge as am;
-use automerge::{Change, ChangeHash, Prop, Value};
+use automerge::{Change, ChangeHash, Prop, Value, ExId};
 use js_sys::{Array, Object, Reflect, Uint8Array};
 use serde::de::DeserializeOwned;
 use serde::Serialize;
@@ -151,9 +151,9 @@ impl Automerge {
     pub fn keys(&mut self, obj: JsValue, heads: JsValue) -> Result<Array, JsValue> {
         let obj = self.import(obj)?;
         let result = if let Some(heads) = get_heads(heads) {
-            self.0.keys_at(obj, &heads)
+            self.0.keys_at(&obj, &heads)
         } else {
-            self.0.keys(obj)
+            self.0.keys(&obj)
         }
         .iter()
         .map(|s| JsValue::from_str(s))
@@ -164,9 +164,9 @@ impl Automerge {
     pub fn text(&mut self, obj: JsValue, heads: JsValue) -> Result<JsValue, JsValue> {
         let obj = self.import(obj)?;
         if let Some(heads) = get_heads(heads) {
-            self.0.text_at(obj, &heads)
+            self.0.text_at(&obj, &heads)
         } else {
-            self.0.text(obj)
+            self.0.text(&obj)
         }
         .map_err(to_js_err)
         .map(|t| t.into())
@@ -185,7 +185,7 @@ impl Automerge {
         let mut vals = vec![];
         if let Some(t) = text.as_string() {
             self.0
-                .splice_text(obj, start, delete_count, &t)
+                .splice_text(&obj, start, delete_count, &t)
                 .map_err(to_js_err)?;
         } else {
             if let Ok(array) = text.dyn_into::<Array>() {
@@ -201,7 +201,7 @@ impl Automerge {
                 }
             }
             self.0
-                .splice(obj, start, delete_count, vals)
+                .splice(&obj, start, delete_count, vals)
                 .map_err(to_js_err)?;
         }
         Ok(())
@@ -223,9 +223,12 @@ impl Automerge {
         let value = self.import_value(value, datatype)?;
         let opid = self
             .0
-            .insert(obj, index as usize, value)
+            .insert(&obj, index as usize, value)
             .map_err(to_js_err)?;
-        Ok(self.export(opid))
+        match opid {
+            Some(opid) => Ok(self.export(opid)),
+            None => Ok(JsValue::null()),
+        }
     }
 
     pub fn set(
@@ -238,7 +241,7 @@ impl Automerge {
         let obj = self.import(obj)?;
         let prop = self.import_prop(prop)?;
         let value = self.import_value(value, datatype)?;
-        let opid = self.0.set(obj, prop, value).map_err(to_js_err)?;
+        let opid = self.0.set(&obj, prop, value).map_err(to_js_err)?;
         match opid {
             Some(opid) => Ok(self.export(opid)),
             None => Ok(JsValue::null()),
@@ -252,7 +255,7 @@ impl Automerge {
             .as_f64()
             .ok_or("inc needs a numberic value")
             .map_err(to_js_err)?;
-        self.0.inc(obj, prop, value as i64).map_err(to_js_err)?;
+        self.0.inc(&obj, prop, value as i64).map_err(to_js_err)?;
         Ok(())
     }
 
@@ -263,9 +266,9 @@ impl Automerge {
         let heads = get_heads(heads);
         if let Ok(prop) = prop {
             let value = if let Some(h) = heads {
-                self.0.value_at(obj, prop, &h)
+                self.0.value_at(&obj, prop, &h)
             } else {
-                self.0.value(obj, prop)
+                self.0.value(&obj, prop)
             }
             .map_err(to_js_err)?;
             match value {
@@ -289,9 +292,9 @@ impl Automerge {
         let prop = to_prop(arg);
         if let Ok(prop) = prop {
             let values = if let Some(heads) = get_heads(heads) {
-                self.0.values_at(obj, prop, &heads)
+                self.0.values_at(&obj, prop, &heads)
             } else {
-                self.0.values(obj, prop)
+                self.0.values(&obj, prop)
             }
             .map_err(to_js_err)?;
             for value in values {
@@ -318,16 +321,16 @@ impl Automerge {
     pub fn length(&mut self, obj: JsValue, heads: JsValue) -> Result<JsValue, JsValue> {
         let obj = self.import(obj)?;
         if let Some(heads) = get_heads(heads) {
-            Ok((self.0.length_at(obj, &heads) as f64).into())
+            Ok((self.0.length_at(&obj, &heads) as f64).into())
         } else {
-            Ok((self.0.length(obj) as f64).into())
+            Ok((self.0.length(&obj) as f64).into())
         }
     }
 
     pub fn del(&mut self, obj: JsValue, prop: JsValue) -> Result<(), JsValue> {
         let obj = self.import(obj)?;
         let prop = to_prop(prop)?;
-        self.0.del(obj, prop).map_err(to_js_err)?;
+        self.0.del(&obj, prop).map_err(to_js_err)?;
         Ok(())
     }
 
@@ -442,11 +445,11 @@ impl Automerge {
         }
     }
 
-    fn export<E: automerge::Exportable>(&self, val: E) -> JsValue {
+    fn export(&self, val: ExId) -> JsValue {
-        self.0.export(val).into()
+        val.to_string().into()
     }
 
-    fn import<I: automerge::Importable>(&self, id: JsValue) -> Result<I, JsValue> {
+    fn import(&self, id: JsValue) -> Result<ExId, JsValue> {
         let id_str = id
             .as_string()
             .ok_or("invalid opid/objid/elemid")

automerge/src/change.rs

@@ -8,7 +8,6 @@ use crate::encoding::{Encodable, DEFLATE_MIN_SIZE};
 use crate::legacy as amp;
 use crate::{
     ActorId, AutomergeError, ElemId, IndexedCache, Key, ObjId, Op, OpId, OpType, Transaction, HEAD,
-    ROOT,
 };
 use core::ops::Range;
 use flate2::{
@@ -417,7 +416,7 @@ fn increment_range_map(ranges: &mut HashMap<u32, Range<usize>>, len: usize) {
 }
 
 fn export_objid(id: &ObjId, actors: &IndexedCache<ActorId>) -> amp::ObjectId {
-    if id.0 == ROOT {
+    if id == &ObjId::root() {
         amp::ObjectId::Root
     } else {
         export_opid(&id.0, actors).into()

automerge/src/columnar.rs

@@ -11,7 +11,6 @@ use std::{
     str,
 };
 
-use crate::ROOT;
 use crate::{ActorId, ElemId, Key, ObjId, ObjType, OpId, OpType, ScalarValue};
 
 use crate::legacy as amp;
@@ -846,7 +845,7 @@ impl ObjEncoder {
 
     fn append(&mut self, obj: &ObjId, actors: &[usize]) {
         match obj.0 {
-            ROOT => {
+            OpId(ctr, _) if ctr == 0 => {
                 self.actor.append_null();
                 self.ctr.append_null();
             }
@@ -951,7 +950,7 @@ impl ChangeEncoder {
                 index_by_hash.insert(hash, index);
             }
             self.actor
-                .append_value(actors.lookup(change.actor_id.clone()).unwrap()); //actors.iter().position(|a| a == &change.actor_id).unwrap());
+                .append_value(actors.lookup(&change.actor_id).unwrap()); //actors.iter().position(|a| a == &change.actor_id).unwrap());
             self.seq.append_value(change.seq);
             // FIXME iterops.count is crazy slow
             self.max_op

automerge/src/error.rs

@@ -17,6 +17,8 @@ pub enum AutomergeError {
     InvalidSeq(u64),
     #[error("index {0} is out of bounds")]
     InvalidIndex(usize),
+    #[error("generic automerge error")]
+    Fail,
 }
 
 impl From<std::io::Error> for AutomergeError {

automerge/src/indexed_cache.rs

@@ -2,10 +2,11 @@ use itertools::Itertools;
 use std::collections::HashMap;
 use std::hash::Hash;
 use std::ops::Index;
+use std::rc::Rc;
 
 #[derive(Debug, Clone)]
 pub(crate) struct IndexedCache<T> {
-    pub cache: Vec<T>,
+    pub cache: Vec<Rc<T>>,
     lookup: HashMap<T, usize>,
 }
 
@@ -25,14 +26,14 @@ where
             *n
         } else {
             let n = self.cache.len();
-            self.cache.push(item.clone());
+            self.cache.push(Rc::new(item.clone()));
             self.lookup.insert(item, n);
             n
         }
     }
 
-    pub fn lookup(&self, item: T) -> Option<usize> {
+    pub fn lookup(&self, item: &T) -> Option<usize> {
-        self.lookup.get(&item).cloned()
+        self.lookup.get(item).cloned()
     }
 
     pub fn len(&self) -> usize {
@@ -48,7 +49,7 @@ where
         self.cache.iter().sorted().cloned().for_each(|item| {
             let n = sorted.cache.len();
             sorted.cache.push(item.clone());
-            sorted.lookup.insert(item, n);
+            sorted.lookup.insert(item.as_ref().clone(), n);
         });
         sorted
     }
@@ -63,7 +64,7 @@ where
 }
 
 impl<T> IntoIterator for IndexedCache<T> {
-    type Item = T;
+    type Item = Rc<T>;
     type IntoIter = std::vec::IntoIter<Self::Item>;
 
     fn into_iter(self) -> Self::IntoIter {

automerge/src/lib.rs

@@ -46,12 +46,14 @@ mod query;
 mod types;
 mod value;
 
+use std::rc::Rc;
+use std::fmt;
 use change::{encode_document, export_change};
 use clock::Clock;
 use indexed_cache::IndexedCache;
 use op_set::OpSet;
 use std::collections::{HashMap, HashSet, VecDeque};
-use types::{ElemId, Key, ObjId, Op, HEAD};
+use types::{ElemId, Key, ObjId, Op, OpId, HEAD, Export, Exportable };
 use unicode_segmentation::UnicodeSegmentation;
 
 pub use change::{decode_change, Change};
@@ -59,8 +61,7 @@ pub use error::AutomergeError;
 pub use legacy::Change as ExpandedChange;
 pub use sync::{BloomFilter, SyncHave, SyncMessage, SyncState};
 pub use types::{
-    ActorId, ChangeHash, Export, Exportable, Importable, ObjType, OpId, OpType, Patch, Peer, Prop,
+    ActorId, ChangeHash, ObjType, OpType, Patch, Peer, Prop,
-    ROOT,
 };
 pub use value::{ScalarValue, Value};
 
@@ -78,6 +79,35 @@ pub struct Automerge {
     transaction: Option<Transaction>,
 }
 
+#[derive(Debug, Clone)]
+pub enum ExId {
+    Root,
+    Id(u64, Rc<ActorId>, usize),
+}
+
+impl PartialEq for ExId {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (ExId::Root, ExId::Root) => true,
+            (ExId::Id(ctr1,actor1,_), ExId::Id(ctr2,actor2,_)) if ctr1 == ctr2 && actor1 == actor2 => true,
+            _ => false
+        }
+    }
+}
+
+impl Eq for ExId {}
+
+impl fmt::Display for ExId {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ExId::Root => write!(f, "_root"),
+            ExId::Id(ctr,actor,_) => write!(f, "{}@{}", ctr, actor),
+        }
+    }
+}
+
+pub const ROOT : ExId = ExId::Root;
+
 impl Automerge {
     pub fn new() -> Self {
         Automerge {
@@ -262,24 +292,40 @@ impl Automerge {
     // PropAt::()
     // NthAt::()
 
-    pub fn keys(&self, obj: OpId) -> Vec<String> {
+    pub fn keys(&self, obj: &ExId) -> Vec<String> {
+        if let Ok(obj) = self.exid_to_obj(obj) {
             let q = self.ops.search(obj.into(), query::Keys::new());
-        q.keys.iter().map(|k| self.export(*k)).collect()
+            q.keys.iter().map(|k| self.to_string(*k)).collect()
+        } else {
+            vec![]
+        }
     }
 
-    pub fn keys_at(&self, obj: OpId, heads: &[ChangeHash]) -> Vec<String> {
+    pub fn keys_at(&self, obj: &ExId, heads: &[ChangeHash]) -> Vec<String> {
+        if let Ok(obj) = self.exid_to_obj(obj) {
             let clock = self.clock_at(heads);
             let q = self.ops.search(obj.into(), query::KeysAt::new(clock));
-        q.keys.iter().map(|k| self.export(*k)).collect()
+            q.keys.iter().map(|k| self.to_string(*k)).collect()
+        } else {
+            vec![]
+        }
     }
 
-    pub fn length(&self, obj: OpId) -> usize {
+    pub fn length(&self, obj: &ExId) -> usize {
+        if let Ok(obj) = self.exid_to_obj(obj) {
             self.ops.search(obj.into(), query::Len::new(obj.into())).len
+        } else {
+            0
+        }
     }
 
-    pub fn length_at(&self, obj: OpId, heads: &[ChangeHash]) -> usize {
+    pub fn length_at(&self, obj: &ExId, heads: &[ChangeHash]) -> usize {
+        if let Ok(obj) = self.exid_to_obj(obj) {
             let clock = self.clock_at(heads);
-        self.ops.search(obj.into(), query::LenAt::new(clock)).len
+            self.ops.search(obj, query::LenAt::new(clock)).len
+        } else {
+            0
+        }
     }
 
     // set(obj, prop, value) - value can be scalar or objtype
@@ -302,32 +348,73 @@ impl Automerge {
     /// - The key does not exist in the object
     pub fn set<P: Into<Prop>, V: Into<Value>>(
         &mut self,
-        obj: OpId,
+        obj: &ExId,
         prop: P,
         value: V,
-    ) -> Result<Option<OpId>, AutomergeError> {
+    ) -> Result<Option<ExId>, AutomergeError> {
+        let obj = self.exid_to_obj(obj)?;
         let value = value.into();
-        self.local_op(obj.into(), prop.into(), value.into())
+        if let Some(id) = self.local_op(obj, prop.into(), value.into())? {
+            Ok(Some(self.id_to_exid(id)))
+        } else {
+            Ok(None)
+        }
+    }
+
+    fn exid_to_obj(&self, id: &ExId) -> Result<ObjId,AutomergeError> {
+        match id {
+            ExId::Root => Ok(ObjId::root()),
+            ExId::Id(ctr,actor,idx) => {
+                // do a direct get here b/c this could be foriegn and not be within the array
+                // bounds
+                if self.ops.m.actors.cache.get(*idx) == Some(actor) {
+                    Ok(ObjId(OpId(*ctr,*idx)))
+                } else {
+                    // FIXME - make a real error
+                    let idx = self.ops.m.actors.lookup(actor).ok_or(AutomergeError::Fail)?;
+                    Ok(ObjId(OpId(*ctr,idx)))
+                }
+            }
+        }
+    }
+
+    fn id_to_exid(&self, id: OpId) -> ExId {
+        ExId::Id(id.0, self.ops.m.actors.cache[id.1].clone(), id.1)
     }
 
     pub fn insert<V: Into<Value>>(
         &mut self,
-        obj: OpId,
+        obj: &ExId,
         index: usize,
         value: V,
-    ) -> Result<OpId, AutomergeError> {
+    ) -> Result<Option<ExId>, AutomergeError> {
-        let obj = obj.into();
+        let obj = self.exid_to_obj(obj)?;
+        if let Some(id) = self.do_insert(obj, index, value)? {
+            Ok(Some(self.id_to_exid(id)))
+        } else {
+            Ok(None)
+        }
+    }
+
+    fn do_insert<V: Into<Value>>(
+        &mut self,
+        obj: ObjId,
+        index: usize,
+        value: V,
+    ) -> Result<Option<OpId>, AutomergeError> {
         let id = self.next_id();
 
         let query = self.ops.search(obj, query::InsertNth::new(index));
 
         let key = query.key()?;
         let value = value.into();
+        let action = value.into();
+        let is_make = matches!(&action, OpType::Make(_));
 
         let op = Op {
             change: self.history.len(),
             id,
-            action: value.into(),
+            action,
             obj,
             key,
             succ: Default::default(),
@@ -338,60 +425,63 @@ impl Automerge {
         self.ops.insert(query.pos, op.clone());
         self.tx().operations.push(op);
 
-        Ok(id)
+        if is_make {
+            Ok(Some(id))
+        } else {
+            Ok(None)
+        }
     }
 
     pub fn inc<P: Into<Prop>>(
         &mut self,
-        obj: OpId,
+        obj: &ExId,
         prop: P,
         value: i64,
-    ) -> Result<OpId, AutomergeError> {
+    ) -> Result<(), AutomergeError> {
-        match self.local_op(obj.into(), prop.into(), OpType::Inc(value))? {
+        let obj = self.exid_to_obj(obj)?;
-            Some(opid) => Ok(opid),
+        self.local_op(obj.into(), prop.into(), OpType::Inc(value))?;
-            None => {
+        Ok(())
-                panic!("increment should always create a new op")
-            }
-        }
     }
 
-    pub fn del<P: Into<Prop>>(&mut self, obj: OpId, prop: P) -> Result<OpId, AutomergeError> {
+    pub fn del<P: Into<Prop>>(&mut self, obj: &ExId, prop: P) -> Result<(), AutomergeError> {
-        // TODO: Should we also no-op multiple delete operations?
+        let obj = self.exid_to_obj(obj)?;
-        match self.local_op(obj.into(), prop.into(), OpType::Del)? {
+        self.local_op(obj.into(), prop.into(), OpType::Del)?;
-            Some(opid) => Ok(opid),
+        Ok(())
-            None => {
-                panic!("delete should always create a new op")
-            }
-        }
     }
 
     /// Splice new elements into the given sequence. Returns a vector of the OpIds used to insert
     /// the new elements
     pub fn splice(
         &mut self,
-        obj: OpId,
+        obj: &ExId,
         mut pos: usize,
         del: usize,
         vals: Vec<Value>,
-    ) -> Result<Vec<OpId>, AutomergeError> {
+    ) -> Result<Vec<ExId>, AutomergeError> {
+        let obj = self.exid_to_obj(obj)?;
         for _ in 0..del {
-            self.del(obj, pos)?;
+            // del()
+            self.local_op(obj.into(), pos.into(), OpType::Del)?;
         }
-        let mut result = Vec::with_capacity(vals.len());
+        let mut results = Vec::new();
         for v in vals {
-            result.push(self.insert(obj, pos, v)?);
+            // insert()
+            let id = self.do_insert(obj, pos, v)?;
+            if let Some(id) = id {
+                results.push(self.id_to_exid(id));
+            }
             pos += 1;
         }
-        Ok(result)
+        Ok(results)
     }
 
     pub fn splice_text(
-        &mut self,
+        & mut self,
-        obj: OpId,
+        obj: &ExId,
         pos: usize,
         del: usize,
         text: &str,
-    ) -> Result<Vec<OpId>, AutomergeError> {
+    ) -> Result<Vec<ExId>, AutomergeError> {
         let mut vals = vec![];
         for c in text.to_owned().graphemes(true) {
             vals.push(c.into());
@@ -399,8 +489,8 @@ impl Automerge {
         self.splice(obj, pos, del, vals)
     }
 
-    pub fn text(&self, obj: OpId) -> Result<String, AutomergeError> {
+    pub fn text(&self, obj: &ExId) -> Result<String, AutomergeError> {
-        let obj = obj.into();
+        let obj = self.exid_to_obj(obj)?;
         let query = self.ops.search(obj, query::ListVals::new(obj));
         let mut buffer = String::new();
         for q in &query.ops {
@@ -411,9 +501,9 @@ impl Automerge {
         Ok(buffer)
     }
 
-    pub fn text_at(&self, obj: OpId, heads: &[ChangeHash]) -> Result<String, AutomergeError> {
+    pub fn text_at(&self, obj: &ExId, heads: &[ChangeHash]) -> Result<String, AutomergeError> {
+        let obj = self.exid_to_obj(obj)?;
         let clock = self.clock_at(heads);
-        let obj = obj.into();
         let query = self.ops.search(obj, query::ListValsAt::new(clock));
         let mut buffer = String::new();
         for q in &query.ops {
@@ -429,36 +519,36 @@ impl Automerge {
     // Something better?
     pub fn value<P: Into<Prop>>(
         &self,
-        obj: OpId,
+        obj: &ExId,
         prop: P,
-    ) -> Result<Option<(Value, OpId)>, AutomergeError> {
+    ) -> Result<Option<(Value, ExId)>, AutomergeError> {
         Ok(self.values(obj, prop.into())?.first().cloned())
     }
 
     pub fn value_at<P: Into<Prop>>(
         &self,
-        obj: OpId,
+        obj: &ExId,
         prop: P,
         heads: &[ChangeHash],
-    ) -> Result<Option<(Value, OpId)>, AutomergeError> {
+    ) -> Result<Option<(Value, ExId)>, AutomergeError> {
         Ok(self.values_at(obj, prop, heads)?.first().cloned())
     }
 
     pub fn values<P: Into<Prop>>(
         &self,
-        obj: OpId,
+        obj: &ExId,
         prop: P,
-    ) -> Result<Vec<(Value, OpId)>, AutomergeError> {
+    ) -> Result<Vec<(Value, ExId)>, AutomergeError> {
-        let obj = obj.into();
+        let obj = self.exid_to_obj(obj)?;
         let result = match prop.into() {
             Prop::Map(p) => {
-                let prop = self.ops.m.props.lookup(p);
+                let prop = self.ops.m.props.lookup(&p);
                 if let Some(p) = prop {
                     self.ops
                         .search(obj, query::Prop::new(obj, p))
                         .ops
                         .into_iter()
-                        .map(|o| o.into())
+                        .map(|o| (o.value(), self.id_to_exid(o.id)))
                         .collect()
                 } else {
                     vec![]
@@ -469,7 +559,7 @@ impl Automerge {
                 .search(obj, query::Nth::new(n))
                 .ops
                 .into_iter()
-                .map(|o| o.into())
+                .map(|o| (o.value(), self.id_to_exid(o.id)))
                 .collect(),
         };
         Ok(result)
@@ -477,22 +567,22 @@ impl Automerge {
 
     pub fn values_at<P: Into<Prop>>(
         &self,
-        obj: OpId,
+        obj: &ExId,
         prop: P,
         heads: &[ChangeHash],
-    ) -> Result<Vec<(Value, OpId)>, AutomergeError> {
+    ) -> Result<Vec<(Value, ExId)>, AutomergeError> {
         let prop = prop.into();
-        let obj = obj.into();
+        let obj = self.exid_to_obj(obj)?;
         let clock = self.clock_at(heads);
         let result = match prop {
             Prop::Map(p) => {
-                let prop = self.ops.m.props.lookup(p);
+                let prop = self.ops.m.props.lookup(&p);
                 if let Some(p) = prop {
                     self.ops
                         .search(obj, query::PropAt::new(p, clock))
                         .ops
                         .into_iter()
-                        .map(|o| o.into())
+                        .map(|o| (o.value(), self.id_to_exid(o.id)))
                         .collect()
                 } else {
                     vec![]
@@ -503,7 +593,7 @@ impl Automerge {
                 .search(obj, query::NthAt::new(n, clock))
                 .ops
                 .into_iter()
-                .map(|o| o.into())
+                .map(|o| (o.value(), self.id_to_exid(o.id)))
                 .collect(),
         };
         Ok(result)
@@ -576,20 +666,11 @@ impl Automerge {
         let prop = self.ops.m.props.cache(prop);
         let query = self.ops.search(obj, query::Prop::new(obj, prop));
 
-        match (&query.ops[..], &action) {
+        if query.ops.len() == 1 && query.ops[0].is_noop(&action) {
-            // If there are no conflicts for this value and the old operation and the new operation are
-            // both setting the same value then we do nothing.
-            (
-                &[Op {
-                    action: OpType::Set(ref old_v),
-                    ..
-                }],
-                OpType::Set(new_v),
-            ) if old_v == new_v => {
             return Ok(None);
         }
-            _ => {}
+
-        }
+        let is_make = matches!(&action, OpType::Make(_));
 
         let pred = query.ops.iter().map(|op| op.id).collect();
 
@@ -606,7 +687,11 @@ impl Automerge {
 
         self.insert_local_op(op, query.pos, &query.ops_pos);
 
+        if is_make {
             Ok(Some(id))
+        } else {
+            Ok(None)
+        }
     }
 
     fn local_list_op(
@@ -621,20 +706,11 @@ impl Automerge {
         let pred = query.ops.iter().map(|op| op.id).collect();
         let key = query.key()?;
 
-        match (&query.ops[..], &action) {
+        if query.ops.len() == 1 && query.ops[0].is_noop(&action) {
-            // If there are no conflicts for this value and the old operation and the new operation are
-            // both setting the same value then we do nothing.
-            (
-                &[Op {
-                    action: OpType::Set(ref old_v),
-                    ..
-                }],
-                OpType::Set(new_v),
-            ) if old_v == new_v => {
             return Ok(None);
         }
-            _ => {}
+
-        }
+        let is_make = matches!(&action, OpType::Make(_));
 
         let op = Op {
             change: self.history.len(),
@@ -649,7 +725,11 @@ impl Automerge {
 
         self.insert_local_op(op, query.pos, &query.ops_pos);
 
+        if is_make {
             Ok(Some(id))
+        } else {
+            Ok(None)
+        }
     }
 
     fn is_causally_ready(&self, change: &Change) -> bool {
@@ -677,20 +757,19 @@ impl Automerge {
             .map(|(i, c)| {
                 let actor = self.ops.m.actors.cache(change.actor_id().clone());
                 let id = OpId(change.start_op + i as u64, actor);
-                // FIXME dont need to_string()
+                let obj = match c.obj {
-                let obj: ObjId = self.import(&c.obj.to_string()).unwrap();
+                    legacy::ObjectId::Root => ObjId::root(),
+                    legacy::ObjectId::Id(id) => ObjId(OpId(id.0, self.ops.m.actors.cache(id.1))),
+                };
                 let pred = c
                     .pred
                     .iter()
-                    .map(|i| self.import(&i.to_string()).unwrap())
+                    .map(|i| OpId(i.0, self.ops.m.actors.cache(i.1.clone())))
                     .collect();
                 let key = match &c.key {
                     legacy::Key::Map(n) => Key::Map(self.ops.m.props.cache(n.to_string())),
                     legacy::Key::Seq(legacy::ElementId::Head) => Key::Seq(HEAD),
-                    // FIXME dont need to_string()
+                    legacy::Key::Seq(legacy::ElementId::Id(i)) => Key::Seq(ElemId(OpId(i.0, self.ops.m.actors.cache(i.1.clone()))))
-                    legacy::Key::Seq(legacy::ElementId::Id(i)) => {
-                        Key::Seq(self.import(&i.to_string()).unwrap())
-                    }
                 };
                 Op {
                     change: change_id,
@@ -724,11 +803,13 @@ impl Automerge {
         let c: Vec<_> = self.history.iter().map(|c| c.decode()).collect();
         let ops: Vec<_> = self.ops.iter().cloned().collect();
         // TODO - can we make encode_document error free
+        let tmp : Vec<_> = self.ops.m.props.cache.iter().map(|a| a.as_ref().clone()).collect();
+        // FIXME : tmp
         let bytes = encode_document(
             &c,
             ops.as_slice(),
             &self.ops.m.actors,
-            &self.ops.m.props.cache,
+            &tmp
         );
         if bytes.is_ok() {
             self.saved = self.get_heads().iter().copied().collect();
@@ -930,7 +1011,7 @@ impl Automerge {
                         to_see.push(*h);
                     }
                 }
-                let actor = self.ops.m.actors.lookup(c.actor_id().clone()).unwrap();
+                let actor = self.ops.m.actors.lookup(c.actor_id()).unwrap();
                 clock.include(actor, c.max_op());
                 seen.insert(hash);
             }
@@ -1023,9 +1104,9 @@ impl Automerge {
         self.deps.insert(change.hash);
     }
 
-    pub fn import<I: Importable>(&self, s: &str) -> Result<I, AutomergeError> {
+    pub fn import(&self, s: &str) -> Result<ExId, AutomergeError> {
-        if let Some(x) = I::from(s) {
+        if s == "_root" { 
-            Ok(x)
+            Ok(ExId::Root)
         } else {
             let n = s
                 .find('@')
@@ -1038,13 +1119,13 @@ impl Automerge {
                 .ops
                 .m
                 .actors
-                .lookup(actor)
+                .lookup(&actor)
                 .ok_or_else(|| AutomergeError::InvalidOpId(s.to_owned()))?;
-            Ok(I::wrap(OpId(counter, actor)))
+            Ok(ExId::Id(counter, self.ops.m.actors.cache[actor].clone(), actor))
         }
     }
 
-    pub fn export<E: Exportable>(&self, id: E) -> String {
+    fn to_string<E: Exportable>(&self, id: E) -> String {
         match id.export() {
             Export::Id(id) => format!("{}@{}", id.counter(), self.ops.m.actors[id.actor()]),
             Export::Prop(index) => self.ops.m.props[index].clone(),
@@ -1063,11 +1144,11 @@ impl Automerge {
             "succ"
         );
         for i in self.ops.iter() {
-            let id = self.export(i.id);
+            let id = self.to_string(i.id);
-            let obj = self.export(i.obj);
+            let obj = self.to_string(i.obj);
             let key = match i.key {
                 Key::Map(n) => self.ops.m.props[n].clone(),
-                Key::Seq(n) => self.export(n),
+                Key::Seq(n) => self.to_string(n),
             };
             let value: String = match &i.action {
                 OpType::Set(value) => format!("{}", value),
@@ -1075,8 +1156,8 @@ impl Automerge {
                 OpType::Inc(obj) => format!("inc{}", obj),
                 OpType::Del => format!("del{}", 0),
             };
-            let pred: Vec<_> = i.pred.iter().map(|id| self.export(*id)).collect();
+            let pred: Vec<_> = i.pred.iter().map(|id| self.to_string(*id)).collect();
-            let succ: Vec<_> = i.succ.iter().map(|id| self.export(*id)).collect();
+            let succ: Vec<_> = i.succ.iter().map(|id| self.to_string(*id)).collect();
             log!(
                 "  {:12} {:12} {:12} {} {:?} {:?}",
                 id,
@@ -1123,9 +1204,9 @@ mod tests {
     fn insert_op() -> Result<(), AutomergeError> {
         let mut doc = Automerge::new();
         doc.set_actor(ActorId::random());
-        doc.set(ROOT, "hello", "world")?;
+        doc.set(&ROOT, "hello", "world")?;
         assert!(doc.pending_ops() == 1);
-        doc.value(ROOT, "hello")?;
+        doc.value(&ROOT, "hello")?;
         Ok(())
     }
 
@@ -1133,18 +1214,18 @@ mod tests {
     fn test_list() -> Result<(), AutomergeError> {
         let mut doc = Automerge::new();
         doc.set_actor(ActorId::random());
-        let list_id = doc.set(ROOT, "items", Value::list())?.unwrap();
+        let list_id = doc.set(&ROOT, "items", Value::list())?.unwrap();
-        doc.set(ROOT, "zzz", "zzzval")?;
+        doc.set(&ROOT, "zzz", "zzzval")?;
-        assert!(doc.value(ROOT, "items")?.unwrap().1 == list_id);
+        assert!(doc.value(&ROOT, "items")?.unwrap().1 == list_id);
-        doc.insert(list_id, 0, "a")?;
+        doc.insert(&list_id, 0, "a")?;
-        doc.insert(list_id, 0, "b")?;
+        doc.insert(&list_id, 0, "b")?;
-        doc.insert(list_id, 2, "c")?;
+        doc.insert(&list_id, 2, "c")?;
-        doc.insert(list_id, 1, "d")?;
+        doc.insert(&list_id, 1, "d")?;
-        assert!(doc.value(list_id, 0)?.unwrap().0 == "b".into());
+        assert!(doc.value(&list_id, 0)?.unwrap().0 == "b".into());
-        assert!(doc.value(list_id, 1)?.unwrap().0 == "d".into());
+        assert!(doc.value(&list_id, 1)?.unwrap().0 == "d".into());
-        assert!(doc.value(list_id, 2)?.unwrap().0 == "a".into());
+        assert!(doc.value(&list_id, 2)?.unwrap().0 == "a".into());
-        assert!(doc.value(list_id, 3)?.unwrap().0 == "c".into());
+        assert!(doc.value(&list_id, 3)?.unwrap().0 == "c".into());
-        assert!(doc.length(list_id) == 4);
+        assert!(doc.length(&list_id) == 4);
         doc.save()?;
         Ok(())
     }
@@ -1153,22 +1234,22 @@ mod tests {
     fn test_del() -> Result<(), AutomergeError> {
         let mut doc = Automerge::new();
         doc.set_actor(ActorId::random());
-        doc.set(ROOT, "xxx", "xxx")?;
+        doc.set(&ROOT, "xxx", "xxx")?;
-        assert!(!doc.values(ROOT, "xxx")?.is_empty());
+        assert!(!doc.values(&ROOT, "xxx")?.is_empty());
-        doc.del(ROOT, "xxx")?;
+        doc.del(&ROOT, "xxx")?;
-        assert!(doc.values(ROOT, "xxx")?.is_empty());
+        assert!(doc.values(&ROOT, "xxx")?.is_empty());
         Ok(())
     }
 
     #[test]
     fn test_inc() -> Result<(), AutomergeError> {
         let mut doc = Automerge::new();
-        let id = doc.set(ROOT, "counter", Value::counter(10))?.unwrap();
+        doc.set(&ROOT, "counter", Value::counter(10))?;
-        assert!(doc.value(ROOT, "counter")? == Some((Value::counter(10), id)));
+        assert!(doc.value(&ROOT, "counter")?.unwrap().0 == Value::counter(10));
-        doc.inc(ROOT, "counter", 10)?;
+        doc.inc(&ROOT, "counter", 10)?;
-        assert!(doc.value(ROOT, "counter")? == Some((Value::counter(20), id)));
+        assert!(doc.value(&ROOT, "counter")?.unwrap().0 == Value::counter(20));
-        doc.inc(ROOT, "counter", -5)?;
+        doc.inc(&ROOT, "counter", -5)?;
-        assert!(doc.value(ROOT, "counter")? == Some((Value::counter(15), id)));
+        assert!(doc.value(&ROOT, "counter")?.unwrap().0 == Value::counter(15));
         Ok(())
     }
 
@@ -1176,15 +1257,15 @@ mod tests {
     fn test_save_incremental() -> Result<(), AutomergeError> {
         let mut doc = Automerge::new();
 
-        doc.set(ROOT, "foo", 1)?;
+        doc.set(&ROOT, "foo", 1)?;
 
         let save1 = doc.save().unwrap();
 
-        doc.set(ROOT, "bar", 2)?;
+        doc.set(&ROOT, "bar", 2)?;
 
         let save2 = doc.save_incremental();
 
-        doc.set(ROOT, "baz", 3)?;
+        doc.set(&ROOT, "baz", 3)?;
 
         let save3 = doc.save_incremental();
 
@@ -1202,7 +1283,7 @@ mod tests {
         let mut doc_a = Automerge::load(&save_a)?;
         let mut doc_b = Automerge::load(&save_b)?;
 
-        assert!(doc_a.values(ROOT, "baz")? == doc_b.values(ROOT, "baz")?);
+        assert!(doc_a.values(&ROOT, "baz")? == doc_b.values(&ROOT, "baz")?);
 
         assert!(doc_a.save().unwrap() == doc_b.save().unwrap());
 
@@ -1212,17 +1293,17 @@ mod tests {
     #[test]
     fn test_save_text() -> Result<(), AutomergeError> {
         let mut doc = Automerge::new();
-        let text = doc.set(ROOT, "text", Value::text())?.unwrap();
+        let text = doc.set(&ROOT, "text", Value::text())?.unwrap();
         let heads1 = doc.commit(None, None);
-        doc.splice_text(text, 0, 0, "hello world")?;
+        doc.splice_text(&text, 0, 0, "hello world")?;
         let heads2 = doc.commit(None, None);
-        doc.splice_text(text, 6, 0, "big bad ")?;
+        doc.splice_text(&text, 6, 0, "big bad ")?;
         let heads3 = doc.commit(None, None);
 
-        assert!(&doc.text(text)? == "hello big bad world");
+        assert!(&doc.text(&text)? == "hello big bad world");
-        assert!(&doc.text_at(text, &heads1)?.is_empty());
+        assert!(&doc.text_at(&text, &heads1)?.is_empty());
-        assert!(&doc.text_at(text, &heads2)? == "hello world");
+        assert!(&doc.text_at(&text, &heads2)? == "hello world");
-        assert!(&doc.text_at(text, &heads3)? == "hello big bad world");
+        assert!(&doc.text_at(&text, &heads3)? == "hello big bad world");
 
         Ok(())
     }
@@ -1231,50 +1312,50 @@ mod tests {
     fn test_props_vals_at() -> Result<(), AutomergeError> {
         let mut doc = Automerge::new();
         doc.set_actor("aaaa".try_into().unwrap());
-        doc.set(ROOT, "prop1", "val1")?;
+        doc.set(&ROOT, "prop1", "val1")?;
         doc.commit(None, None);
         let heads1 = doc.get_heads();
-        doc.set(ROOT, "prop1", "val2")?;
+        doc.set(&ROOT, "prop1", "val2")?;
         doc.commit(None, None);
         let heads2 = doc.get_heads();
-        doc.set(ROOT, "prop2", "val3")?;
+        doc.set(&ROOT, "prop2", "val3")?;
         doc.commit(None, None);
         let heads3 = doc.get_heads();
-        doc.del(ROOT, "prop1")?;
+        doc.del(&ROOT, "prop1")?;
         doc.commit(None, None);
         let heads4 = doc.get_heads();
-        doc.set(ROOT, "prop3", "val4")?;
+        doc.set(&ROOT, "prop3", "val4")?;
         doc.commit(None, None);
         let heads5 = doc.get_heads();
-        assert!(doc.keys_at(ROOT, &heads1) == vec!["prop1".to_owned()]);
+        assert!(doc.keys_at(&ROOT, &heads1) == vec!["prop1".to_owned()]);
-        assert!(doc.value_at(ROOT, "prop1", &heads1)?.unwrap().0 == Value::str("val1"));
+        assert!(doc.value_at(&ROOT, "prop1", &heads1)?.unwrap().0 == Value::str("val1"));
-        assert!(doc.value_at(ROOT, "prop2", &heads1)? == None);
+        assert!(doc.value_at(&ROOT, "prop2", &heads1)? == None);
-        assert!(doc.value_at(ROOT, "prop3", &heads1)? == None);
+        assert!(doc.value_at(&ROOT, "prop3", &heads1)? == None);
 
-        assert!(doc.keys_at(ROOT, &heads2) == vec!["prop1".to_owned()]);
+        assert!(doc.keys_at(&ROOT, &heads2) == vec!["prop1".to_owned()]);
-        assert!(doc.value_at(ROOT, "prop1", &heads2)?.unwrap().0 == Value::str("val2"));
+        assert!(doc.value_at(&ROOT, "prop1", &heads2)?.unwrap().0 == Value::str("val2"));
-        assert!(doc.value_at(ROOT, "prop2", &heads2)? == None);
+        assert!(doc.value_at(&ROOT, "prop2", &heads2)? == None);
-        assert!(doc.value_at(ROOT, "prop3", &heads2)? == None);
+        assert!(doc.value_at(&ROOT, "prop3", &heads2)? == None);
 
-        assert!(doc.keys_at(ROOT, &heads3) == vec!["prop1".to_owned(), "prop2".to_owned()]);
+        assert!(doc.keys_at(&ROOT, &heads3) == vec!["prop1".to_owned(), "prop2".to_owned()]);
-        assert!(doc.value_at(ROOT, "prop1", &heads3)?.unwrap().0 == Value::str("val2"));
+        assert!(doc.value_at(&ROOT, "prop1", &heads3)?.unwrap().0 == Value::str("val2"));
-        assert!(doc.value_at(ROOT, "prop2", &heads3)?.unwrap().0 == Value::str("val3"));
+        assert!(doc.value_at(&ROOT, "prop2", &heads3)?.unwrap().0 == Value::str("val3"));
-        assert!(doc.value_at(ROOT, "prop3", &heads3)? == None);
+        assert!(doc.value_at(&ROOT, "prop3", &heads3)? == None);
 
-        assert!(doc.keys_at(ROOT, &heads4) == vec!["prop2".to_owned()]);
+        assert!(doc.keys_at(&ROOT, &heads4) == vec!["prop2".to_owned()]);
-        assert!(doc.value_at(ROOT, "prop1", &heads4)? == None);
+        assert!(doc.value_at(&ROOT, "prop1", &heads4)? == None);
-        assert!(doc.value_at(ROOT, "prop2", &heads4)?.unwrap().0 == Value::str("val3"));
+        assert!(doc.value_at(&ROOT, "prop2", &heads4)?.unwrap().0 == Value::str("val3"));
-        assert!(doc.value_at(ROOT, "prop3", &heads4)? == None);
+        assert!(doc.value_at(&ROOT, "prop3", &heads4)? == None);
 
-        assert!(doc.keys_at(ROOT, &heads5) == vec!["prop2".to_owned(), "prop3".to_owned()]);
+        assert!(doc.keys_at(&ROOT, &heads5) == vec!["prop2".to_owned(), "prop3".to_owned()]);
-        assert!(doc.value_at(ROOT, "prop1", &heads5)? == None);
+        assert!(doc.value_at(&ROOT, "prop1", &heads5)? == None);
-        assert!(doc.value_at(ROOT, "prop2", &heads5)?.unwrap().0 == Value::str("val3"));
+        assert!(doc.value_at(&ROOT, "prop2", &heads5)?.unwrap().0 == Value::str("val3"));
-        assert!(doc.value_at(ROOT, "prop3", &heads5)?.unwrap().0 == Value::str("val4"));
+        assert!(doc.value_at(&ROOT, "prop3", &heads5)?.unwrap().0 == Value::str("val4"));
 
-        assert!(doc.keys_at(ROOT, &[]).is_empty());
+        assert!(doc.keys_at(&ROOT, &[]).is_empty());
-        assert!(doc.value_at(ROOT, "prop1", &[])? == None);
+        assert!(doc.value_at(&ROOT, "prop1", &[])? == None);
-        assert!(doc.value_at(ROOT, "prop2", &[])? == None);
+        assert!(doc.value_at(&ROOT, "prop2", &[])? == None);
-        assert!(doc.value_at(ROOT, "prop3", &[])? == None);
+        assert!(doc.value_at(&ROOT, "prop3", &[])? == None);
         Ok(())
     }
 
@@ -1283,47 +1364,47 @@ mod tests {
         let mut doc = Automerge::new();
         doc.set_actor("aaaa".try_into().unwrap());
 
-        let list = doc.set(ROOT, "list", Value::list())?.unwrap();
+        let list = doc.set(&ROOT, "list", Value::list())?.unwrap();
         let heads1 = doc.commit(None, None);
 
-        doc.insert(list, 0, Value::int(10))?;
+        doc.insert(&list, 0, Value::int(10))?;
         let heads2 = doc.commit(None, None);
 
-        doc.set(list, 0, Value::int(20))?;
+        doc.set(&list, 0, Value::int(20))?;
-        doc.insert(list, 0, Value::int(30))?;
+        doc.insert(&list, 0, Value::int(30))?;
         let heads3 = doc.commit(None, None);
 
-        doc.set(list, 1, Value::int(40))?;
+        doc.set(&list, 1, Value::int(40))?;
-        doc.insert(list, 1, Value::int(50))?;
+        doc.insert(&list, 1, Value::int(50))?;
         let heads4 = doc.commit(None, None);
 
-        doc.del(list, 2)?;
+        doc.del(&list, 2)?;
         let heads5 = doc.commit(None, None);
 
-        doc.del(list, 0)?;
+        doc.del(&list, 0)?;
         let heads6 = doc.commit(None, None);
 
-        assert!(doc.length_at(list, &heads1) == 0);
+        assert!(doc.length_at(&list, &heads1) == 0);
-        assert!(doc.value_at(list, 0, &heads1)?.is_none());
+        assert!(doc.value_at(&list, 0, &heads1)?.is_none());
 
-        assert!(doc.length_at(list, &heads2) == 1);
+        assert!(doc.length_at(&list, &heads2) == 1);
-        assert!(doc.value_at(list, 0, &heads2)?.unwrap().0 == Value::int(10));
+        assert!(doc.value_at(&list, 0, &heads2)?.unwrap().0 == Value::int(10));
 
-        assert!(doc.length_at(list, &heads3) == 2);
+        assert!(doc.length_at(&list, &heads3) == 2);
-        assert!(doc.value_at(list, 0, &heads3)?.unwrap().0 == Value::int(30));
+        assert!(doc.value_at(&list, 0, &heads3)?.unwrap().0 == Value::int(30));
-        assert!(doc.value_at(list, 1, &heads3)?.unwrap().0 == Value::int(20));
+        assert!(doc.value_at(&list, 1, &heads3)?.unwrap().0 == Value::int(20));
 
-        assert!(doc.length_at(list, &heads4) == 3);
+        assert!(doc.length_at(&list, &heads4) == 3);
-        assert!(doc.value_at(list, 0, &heads4)?.unwrap().0 == Value::int(30));
+        assert!(doc.value_at(&list, 0, &heads4)?.unwrap().0 == Value::int(30));
-        assert!(doc.value_at(list, 1, &heads4)?.unwrap().0 == Value::int(50));
+        assert!(doc.value_at(&list, 1, &heads4)?.unwrap().0 == Value::int(50));
-        assert!(doc.value_at(list, 2, &heads4)?.unwrap().0 == Value::int(40));
+        assert!(doc.value_at(&list, 2, &heads4)?.unwrap().0 == Value::int(40));
 
-        assert!(doc.length_at(list, &heads5) == 2);
+        assert!(doc.length_at(&list, &heads5) == 2);
-        assert!(doc.value_at(list, 0, &heads5)?.unwrap().0 == Value::int(30));
+        assert!(doc.value_at(&list, 0, &heads5)?.unwrap().0 == Value::int(30));
-        assert!(doc.value_at(list, 1, &heads5)?.unwrap().0 == Value::int(50));
+        assert!(doc.value_at(&list, 1, &heads5)?.unwrap().0 == Value::int(50));
 
-        assert!(doc.length_at(list, &heads6) == 1);
+        assert!(doc.length_at(&list, &heads6) == 1);
-        assert!(doc.value_at(list, 0, &heads6)?.unwrap().0 == Value::int(50));
+        assert!(doc.value_at(&list, 0, &heads6)?.unwrap().0 == Value::int(50));
 
         Ok(())
     }

automerge/src/types.rs

@@ -1,6 +1,6 @@
 use crate::error;
 use crate::legacy as amp;
-use crate::ScalarValue;
+use crate::{ Value, ScalarValue };
 use serde::{Deserialize, Serialize};
 use std::cmp::Eq;
 use std::convert::TryFrom;
@@ -10,7 +10,7 @@ use std::str::FromStr;
 use tinyvec::{ArrayVec, TinyVec};
 
 pub(crate) const HEAD: ElemId = ElemId(OpId(0, 0));
-pub const ROOT: OpId = OpId(0, 0);
+pub(crate) const ROOT: OpId = OpId(0, 0);
 
 const ROOT_STR: &str = "_root";
 const HEAD_STR: &str = "_head";
@@ -161,23 +161,16 @@ pub enum OpType {
 }
 
 #[derive(Debug)]
-pub enum Export {
+pub(crate) enum Export {
     Id(OpId),
     Special(String),
     Prop(usize),
 }
 
-pub trait Exportable {
+pub(crate) trait Exportable {
     fn export(&self) -> Export;
 }
 
-pub trait Importable {
-    fn wrap(id: OpId) -> Self;
-    fn from(s: &str) -> Option<Self>
-    where
-        Self: std::marker::Sized;
-}
-
 impl OpId {
     #[inline]
     pub fn counter(&self) -> u64 {
@@ -234,45 +227,6 @@ impl Exportable for Key {
     }
 }
 
-impl Importable for ObjId {
-    fn wrap(id: OpId) -> Self {
-        ObjId(id)
-    }
-    fn from(s: &str) -> Option<Self> {
-        if s == ROOT_STR {
-            Some(ROOT.into())
-        } else {
-            None
-        }
-    }
-}
-
-impl Importable for OpId {
-    fn wrap(id: OpId) -> Self {
-        id
-    }
-    fn from(s: &str) -> Option<Self> {
-        if s == ROOT_STR {
-            Some(ROOT)
-        } else {
-            None
-        }
-    }
-}
-
-impl Importable for ElemId {
-    fn wrap(id: OpId) -> Self {
-        ElemId(id)
-    }
-    fn from(s: &str) -> Option<Self> {
-        if s == HEAD_STR {
-            Some(HEAD)
-        } else {
-            None
-        }
-    }
-}
-
 impl From<OpId> for ObjId {
     fn from(o: OpId) -> Self {
         ObjId(o)
@@ -352,11 +306,17 @@ impl Key {
 }
 
 #[derive(Debug, Clone, PartialOrd, Ord, Eq, PartialEq, Copy, Hash, Default)]
-pub struct OpId(pub u64, pub usize);
+pub(crate) struct OpId(pub u64, pub usize);
 
 #[derive(Debug, Clone, Copy, PartialOrd, Eq, PartialEq, Ord, Hash, Default)]
 pub(crate) struct ObjId(pub OpId);
 
+impl ObjId {
+    pub fn root() -> Self {
+        ObjId(OpId(0,0))
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialOrd, Eq, PartialEq, Ord, Hash, Default)]
 pub(crate) struct ElemId(pub OpId);
 
@@ -374,7 +334,11 @@ pub(crate) struct Op {
 
 impl Op {
     pub fn is_del(&self) -> bool {
-        matches!(self.action, OpType::Del)
+        matches!(&self.action, OpType::Del)
+    }
+
+    pub fn is_noop(&self, action: &OpType) -> bool {
+        matches!((&self.action, action), (OpType::Set(n), OpType::Set(m)) if n == m)
     }
 
     pub fn overwrites(&self, other: &Op) -> bool {
@@ -389,6 +353,14 @@ impl Op {
         }
     }
 
+    pub fn value(&self) -> Value {
+        match &self.action {
+            OpType::Make(obj_type) => Value::Object(*obj_type),
+            OpType::Set(scalar) => Value::Scalar(scalar.clone()),
+            _ => panic!("cant convert op into a value - {:?}", self),
+        }
+    }
+
     #[allow(dead_code)]
     pub fn dump(&self) -> String {
         match &self.action {

edit-trace/benches/main.rs

@@ -5,9 +5,9 @@ use std::fs;
 fn replay_trace(commands: Vec<(usize, usize, Vec<Value>)>) -> Automerge {
     let mut doc = Automerge::new();
 
-    let text = doc.set(ROOT, "text", Value::text()).unwrap().unwrap();
+    let text = doc.set(&ROOT, "text", Value::text()).unwrap().unwrap();
     for (pos, del, vals) in commands {
-        doc.splice(text, pos, del, vals).unwrap();
+        doc.splice(&text, pos, del, vals).unwrap();
     }
     doc.commit(None, None);
     doc

edit-trace/src/main.rs

@@ -19,12 +19,12 @@ fn main() -> Result<(), AutomergeError> {
     let mut doc = Automerge::new();
 
     let now = Instant::now();
-    let text = doc.set(ROOT, "text", Value::text()).unwrap().unwrap();
+    let text = doc.set( &ROOT, "text", Value::text()).unwrap().unwrap();
     for (i, (pos, del, vals)) in commands.into_iter().enumerate() {
         if i % 1000 == 0 {
             println!("Processed {} edits in {} ms", i, now.elapsed().as_millis());
         }
-        doc.splice(text, pos, del, vals)?;
+        doc.splice(&text, pos, del, vals)?;
     }
     let _ = doc.save();
     println!("Done in {} ms", now.elapsed().as_millis());