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-rw-r--r--chain/src/item/default/mod.rs57
-rw-r--r--chain/src/item/default/splone.rs189
-rw-r--r--chain/src/item/genins.rs103
-rw-r--r--chain/src/item/mod.rs12
4 files changed, 274 insertions, 87 deletions
diff --git a/chain/src/item/default/mod.rs b/chain/src/item/default/mod.rs
index 3903162..6d28956 100644
--- a/chain/src/item/default/mod.rs
+++ b/chain/src/item/default/mod.rs
@@ -8,6 +8,8 @@ use graph::{
builder::BuilderMut, labelled::binary::PLGBuilderMut, Graph, LabelGraph, PLGraph, RedirectGraph,
};
+use graph_macro::Graph;
+
use std::collections::HashSet;
use core::fmt::Display;
@@ -73,7 +75,7 @@ impl From<ForestLabelError> for Error {
}
/// A default implementation of forest.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Graph)]
pub struct DefaultForest<T: GraphLabel> {
pub(crate) graph: PLGraph<T>,
root: Option<usize>,
@@ -94,56 +96,6 @@ impl<T: GraphLabel> AsRef<DefaultForest<T>> for DefaultForest<T> {
}
}
-impl<T: GraphLabel> Graph for DefaultForest<T> {
- type Iter<'a> = <PLGraph<T> as Graph>::Iter<'a>
- where
- Self: 'a;
-
- #[inline]
- fn is_empty(&self) -> bool {
- self.graph.is_empty()
- }
-
- #[inline]
- fn nodes_len(&self) -> usize {
- self.graph.nodes_len()
- }
-
- #[inline]
- fn edges_len(&self) -> Option<usize> {
- self.graph.edges_len()
- }
-
- #[inline]
- fn children_of(&self, node_id: usize) -> Result<Self::Iter<'_>, GError> {
- self.graph.children_of(node_id)
- }
-
- #[inline]
- fn degree(&self, node_id: usize) -> Result<usize, GError> {
- self.graph.degree(node_id)
- }
-
- #[inline]
- fn is_empty_node(&self, node_id: usize) -> Result<bool, GError> {
- self.graph.is_empty_node(node_id)
- }
-
- #[inline]
- fn has_edge(&self, source: usize, target: usize) -> Result<bool, GError> {
- self.graph.has_edge(source, target)
- }
-
- fn replace_by_builder(&mut self, _builder: impl graph::Builder<Result = Self>) {
- unimplemented!()
- }
-
- #[inline]
- fn print_viz(&self, filename: &str) -> Result<(), std::io::Error> {
- self.graph.print_viz(filename)
- }
-}
-
impl<T: GraphLabel> ParentsGraph for DefaultForest<T> {
type Iter<'a>= <PLGraph<T> as ParentsGraph>::Iter<'a>
where
@@ -1081,6 +1033,9 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
// }
/// Set the position of every node.
+ ///
+ /// If ALLP is non-nil or if the node is a terminal node, also set
+ /// the ending position.
pub(crate) fn set_pos(&mut self, pos: usize, allp: bool) -> Result<(), Error> {
let mut builder = PLGBuilderMut::from_graph_mut(&mut self.graph);
diff --git a/chain/src/item/default/splone.rs b/chain/src/item/default/splone.rs
index 4cd11b9..d77686e 100644
--- a/chain/src/item/default/splone.rs
+++ b/chain/src/item/default/splone.rs
@@ -123,7 +123,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
return Ok(cloned);
}
- let new_label = self.create_new_label(node, end, edge_index)?;
+ let new_label = self.create_new_label(node, end, edge_index, None)?;
let new_label = match new_label {
Eon::Nex(label) => label,
@@ -140,7 +140,126 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
return self.split_node(new_label, node, edge_index, completingp);
}
- // replace the label directly
+ self.replace_label(node, new_label)?;
+
+ Ok(node)
+ }
+
+ /// Split or clone, and then plant.
+ ///
+ /// # Splone
+ ///
+ /// This function is similar to
+ /// [`splone`][DefaultForest::<ForestLabel<GrammarLabel>>::splone],
+ /// but this is specialized for planting a fragment under the
+ /// newly sploned node. See the above-mentionned function for
+ /// details on how to splone.
+ ///
+ /// # Parameter `planted`
+ ///
+ /// The function to plant a fragment takes a parameter `planted`,
+ /// which indicates whether or not the fragment had already been
+ /// planted before. This is used to avoid re-inserting fragments
+ /// into the forest. One can just add an edge and be done.
+ ///
+ /// # Special treatment
+ ///
+ /// This function is aimed at solving a specific problem that the
+ /// function
+ /// [`splone`][DefaultForest::<ForestLabel<GrammarLabel>>::splone]
+ /// faces: duplication of nodes after planting a fragment under
+ /// the newly sploned node. That is, if we splone a node and then
+ /// immediately plant a fragment under it, then that new node will
+ /// become a different node from the original sploned node, so if
+ /// we splone another node that ends up creating the same sploned
+ /// node, and if we plant the same fragment under it, we will end
+ /// up creating duplicated cloned nodes, which later mess up the
+ /// forests.
+ ///
+ /// So this function first checks if the would-be-sploned node
+ /// with the fragment planted already exists; if so, then just
+ /// return that node, otherwise we perform the usual sploning and
+ /// plant the fragment after the splone.
+ ///
+ /// # Special values of two parameters to `splone`
+ ///
+ /// Since we want to plant a fragment under the splone, the
+ /// parameter `end` to the splone function is set to `None`
+ /// automatically.
+ ///
+ /// Moreover, the parameter `completingp` is for completing the
+ /// forest at the end, while we are definitely not at the end if
+ /// we are going to plant a fragment after sploning, so that
+ /// parameter is automatically set to `false` as well.
+ pub(crate) fn splant(
+ &mut self,
+ node: usize,
+ edge_index: usize,
+ fragment: &DefaultForest<ForestLabel<GrammarLabel>>,
+ planted: bool,
+ ) -> Result<usize, Error> {
+ let node_label = self.vertex_label(node)?.ok_or(Error::NodeNoLabel(node))?;
+
+ assert!(get_nt_label(node_label.label()).is_some());
+
+ if node_label.is_packed() {
+ self.print_viz("dbg forest.gv").unwrap();
+ dbg!(self.vertex_label(node)?);
+ return Err(Error::SplitPack(node));
+ }
+
+ let node_end = node_label.label().end();
+ let node_degree = self.degree(node)?;
+
+ // We can check the end to know whether the new label is equal
+ // to the old label.
+ if node_end.is_none() {
+ if node_degree == edge_index + 2 {
+ let last_child = self.nth_child(node, node_degree - 1)?;
+
+ if self.is_prefix(last_child, fragment.borrow())? {
+ return Ok(node);
+ }
+ }
+
+ if node_degree <= edge_index + 1 {
+ self.plant(node, fragment, planted)?;
+
+ return Ok(node);
+ }
+
+ let cloned = self.clone_node(node, edge_index + 1, false)?;
+
+ self.plant(cloned, fragment, planted)?;
+
+ return Ok(cloned);
+ }
+
+ let new_label = self.create_new_label(node, None, edge_index, Some((fragment, planted)))?;
+
+ let new_label = match new_label {
+ Eon::Nex(label) => label,
+ Eon::Ex(existing) => {
+ return Ok(existing);
+ }
+ };
+
+ let splitted = self.split_node(new_label, node, edge_index, false)?;
+
+ self.plant(splitted, fragment, planted)?;
+
+ Ok(splitted)
+ }
+
+ /// Replace the label of a node by a new label.
+ ///
+ /// This also handles the labels of parents of the node.
+ fn replace_label(
+ &mut self,
+ node: usize,
+ new_label: ForestLabel<GrammarLabel>,
+ ) -> Result<(), Error> {
+ let end = new_label.label().end();
let mut builder = PLGBuilderMut::from_graph_mut(&mut self.graph);
@@ -162,7 +281,6 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
panic!("assumption fails");
}
- assert!(get_rule_label(parent_label).is_some());
assert_eq!(builder.degree(parent)?, 1);
if let Some(pos) = end {
@@ -176,7 +294,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
builder.set_label(parent, parent_label)?;
}
- Ok(node)
+ Ok(())
}
/// Procedure to split the node:
@@ -352,11 +470,23 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
/// existing label, and return the clone of the cloned label.
///
/// 7. Else return the plain label.
+ ///
+ /// # Fragment planting
+ ///
+ /// If the parameter `fragment` contains a fragment, that means we
+ /// also check if an existing label is what we want by checking
+ /// whether it has the same children except for the last one,
+ /// whereas its last child contains the fragment as a prefix.
+ ///
+ /// Also, if an existing label is found to have exactly the same
+ /// children, then for the sake of consistency, we plant the
+ /// fragment under that existing node.
fn create_new_label(
&mut self,
node: usize,
end: Option<usize>,
edge_index: usize,
+ fragment: Option<(&DefaultForest<ForestLabel<GrammarLabel>>, bool)>,
) -> Result<Eon, Error> {
let mut copied_label = self
.vertex_label(node)?
@@ -373,9 +503,29 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
if let Some(packed) = self.query_label(label) {
for child in self.children_of(packed)? {
- if self.has_same_children(child, node, self.degree(child)?, edge_index + 1)? {
+ let child_degree = self.degree(child)?;
+
+ if self.has_same_children(child, node, child_degree, edge_index + 1)? {
+ if let Some((fragment, planted)) = fragment {
+ self.plant(child, fragment, planted)?;
+ }
+
return Ok(Eon::Ex(child));
}
+
+ if let Some((fragment, _planted)) = fragment {
+ let modified_degree = std::cmp::max(child_degree, 1) - 1;
+
+ if self.has_same_children(child, node, modified_degree, edge_index)?
+ && child_degree != 0
+ {
+ let last_child = self.nth_child(child, child_degree - 1)?;
+
+ if self.is_prefix(last_child, fragment)? {
+ return Ok(Eon::Ex(child));
+ }
+ }
+ }
}
let mut packed_children = self.children_of(packed)?;
@@ -384,18 +534,37 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
let clone_index = self.clone_node(first_child, 0, true)?;
- Ok(Eon::Nex(ForestLabel::new(
- copied_label,
- ForestLabelType::Cloned(clone_index),
- )))
+ let cloned_label = ForestLabel::new(copied_label, ForestLabelType::Cloned(clone_index));
+
+ Ok(Eon::Nex(cloned_label))
} else {
let plain_label = ForestLabel::new(copied_label, ForestLabelType::Plain);
if let Some(existing) = self.query_label(plain_label) {
- if self.has_same_children(existing, node, self.degree(existing)?, edge_index + 1)? {
+ let existing_degree = self.degree(existing)?;
+
+ if self.has_same_children(existing, node, existing_degree, edge_index + 1)? {
+ if let Some((fragment, planted)) = fragment {
+ self.plant(existing, fragment, planted)?;
+ }
+
return Ok(Eon::Ex(existing));
}
+ if let Some((fragment, _planted)) = fragment {
+ let modified_degree = std::cmp::max(existing_degree, 1) - 1;
+
+ if existing_degree != 0
+ && self.has_same_children(existing, node, modified_degree, edge_index)?
+ {
+ let last_child = self.nth_child(existing, existing_degree - 1)?;
+
+ if self.is_prefix(last_child, fragment)? {
+ return Ok(Eon::Ex(existing));
+ }
+ }
+ }
+
let clone_index = self.clone_node(existing, 0, true)?;
Ok(Eon::Nex(ForestLabel::new(
diff --git a/chain/src/item/genins.rs b/chain/src/item/genins.rs
index 0c3f616..97d7ba9 100644
--- a/chain/src/item/genins.rs
+++ b/chain/src/item/genins.rs
@@ -190,7 +190,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
let root = if let Some(root) = self.root() {
root
} else {
- panic!("the forest must be non-empty when we insert items");
+ unreachable!("the forest must be non-empty when we insert items");
};
let pavi = label.forest_source();
@@ -211,13 +211,50 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
let pos = fragment_root_label.label().start();
+ dbg!((pos, label));
+
+ let tnt_string = {
+ let empty_p = atom_child_iter.len() == 0;
+ let label = fragment.vertex_label(fragment.nodes_len() - 1)?.unwrap();
+
+ match label.label().label() {
+ GrammarLabelType::TNT(TNT::Ter(t)) => {
+ format!("t {t}")
+ }
+ GrammarLabelType::TNT(TNT::Non(n)) => {
+ format!("n {n} {}", if empty_p { "second" } else { "first" })
+ }
+ _ => "error".to_string(),
+ }
+ };
+
+ let num = {
+ let mut repetition = 0;
+
+ while std::fs::metadata(format!(
+ "/Users/durand/Desktop/Centre/A propos de programmes/Rust/rep/chain/output/pos {pos} {tnt_string} {repetition}.gv"
+ ))
+ .is_ok()
+ {
+ repetition += 1;
+ }
+
+ repetition
+ };
+
+ self.print_viz(&format!("pos {pos} {tnt_string} {num}.gv"))
+ .unwrap();
+
self.extra_reductions(
- BoTop::new(pavi, true_source),
+ BoTop::new(true_source, pavi),
pos,
reducer.borrow(),
atom.borrow(),
)?;
+ self.print_viz(&format!("pos {pos} {tnt_string} {num} stage 1.gv"))
+ .unwrap();
+
// Ensure the last node in the PaVi is a terminal or a
// non-terminal node, as an extra safety guard during
// development.
@@ -259,6 +296,8 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
}
}
+ // TODO: Print each and every step.
+
// TODO: Refactor this.
let is_empty_segment = pavi.is_empty();
@@ -290,15 +329,19 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
.vertex_label(frag_nodes_len - 2)?
.ok_or(Error::NodeNoLabel(frag_nodes_len - 2))?;
- // NOTE: The function
- // `plant_if_needed` assumes that we
- // want to plant the fragment as the
- // first child of the node. This
- // assumption holds in this case, but
- // not in general.
+ // NOTE: The function `plant_at_start`
+ // assumes that we want to plant the
+ // fragment as the first child of the
+ // node. This assumption holds in
+ // this case, but not in general.
self.plant_at_start(node, frag)?;
+ self.print_viz(&format!(
+ "pos {pos} {tnt_string} {num} stage 1.5 {node}.gv"
+ ))
+ .unwrap();
+
let rule_label_pos = self
.query_label(last_but_one_label)
.expect("the forest was wrongly planted");
@@ -370,6 +413,13 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
let sploned_node =
self.splone(node.node(), Some(pos), node.edge(), false)?;
+ self.print_viz(&format!(
+ "pos {pos} {tnt_string} {num} stage 2 {} {}.gv",
+ node.node(),
+ node.edge(),
+ ))
+ .unwrap();
+
node_label = self
.vertex_label(sploned_node)?
.ok_or(Error::NodeNoLabel(sploned_node))?;
@@ -394,9 +444,11 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
let parents_iter = self.parents_of(node.node())?;
for parent in parents_iter {
+ let parent_node = parent.node();
+
let parent_label = self
- .vertex_label(parent.node())?
- .ok_or_else(|| Error::NodeNoLabel(parent.node()))?
+ .vertex_label(parent_node)?
+ .ok_or(Error::NodeNoLabel(parent_node))?
.label();
if parent_label.label().rule().is_none() {
@@ -448,15 +500,15 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
return Err(Error::CannotPlant);
}
- if pos == 4 && matches!(true_source, PaVi::Virtual(_, _, _)) {
- dbg!(&stack, reduction_info, true_source, pavi);
- self.print_viz("pos4ib.gv").unwrap();
- }
-
for parent in stack {
- let sploned_node = self.splone(parent.node(), None, parent.edge(), false)?;
+ let splanted = self.splant(parent.node(), parent.edge(), fragment, non_empty)?;
- self.plant(sploned_node, fragment, non_empty)?;
+ self.print_viz(&format!(
+ "pos {pos} {tnt_string} {num} stage 3 {} {} {splanted}.gv",
+ parent.node(),
+ parent.edge(),
+ ))
+ .unwrap();
non_empty = true;
}
@@ -533,12 +585,14 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
}
};
- let t = match root_label.label().label().tnt().unwrap() {
+ let error_str = "a virtual fragment should consist of a single terminal node";
+
+ let t = match root_label.label().label().tnt().expect(error_str) {
TNT::Ter(t) => t,
_ => {
dbg!(root_label);
- panic!("a virtual fragment should consist of a single terminal node")
+ panic!("{error_str}")
}
};
@@ -550,7 +604,7 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
/// Perform extra reductions.
///
- /// To be precise, this functions first splones the bottom node,
+ /// To be precise, this function first splones the bottom node,
/// and then queries the reducer to find the next nodes to splone,
/// and repeats this process until either we find the top node, or
/// the reducer says to stop.
@@ -583,6 +637,9 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
let mut stack = vec![bottom_node];
+ // Exclude duplicate nodes to ensure that no infinite
+ // recursion occurs. In the future I shall experiment if this
+ // is necessary, and get rid of this if possible.
let mut seen_nodes: HashSet<usize> = Default::default();
let mut result = Vec::new();
@@ -683,6 +740,8 @@ impl DefaultForest<ForestLabel<GrammarLabel>> {
// REVIEW: is this really correct?
dbg!("this should not really happen?");
+ // SUMMARY: splone every child of nth_child
+
let mut result: usize = nth_child;
for node in self.children_of(nth_child)?.collect::<Vec<_>>() {
@@ -806,8 +865,8 @@ mod genins_test {
assert!(matches!(atom.query_reduction(17, 9), Ok(Some(&[1]))));
- assert!(matches!(atom.query_reduction(35, 9), Ok(Some(&[1, 2]))));
- assert!(matches!(atom.query_reduction(35, 25), Ok(Some(&[2]))));
+ // assert!(matches!(atom.query_reduction(35, 9), Ok(Some(&[1, 2]))));
+ // assert!(matches!(atom.query_reduction(35, 25), Ok(Some(&[2]))));
Ok(())
}
diff --git a/chain/src/item/mod.rs b/chain/src/item/mod.rs
index f8e0aa0..5efa710 100644
--- a/chain/src/item/mod.rs
+++ b/chain/src/item/mod.rs
@@ -21,11 +21,15 @@ use core::borrow::Borrow;
/// A virtual segment represents an expansion from a non-terminal by a
/// terminal. We do not directly add this segment when we encounter
/// this expansion at the start because this expansion might contain
-/// multiple derivations some of which will not be used.
+/// multiple derivations some of which might not be used.
///
/// If we add the expansion immediately when we encounter it, we have
/// to later discern and delete those unwanted derivations. This is
-/// asking for trouble, in my experiences.
+/// asking for trouble, as I learned from experiences.
+///
+/// # Empty
+///
+/// Also this might be empty if it represents the root node.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Default)]
pub enum PaVi {
/// An edge from a node, as the n-th child.
@@ -35,8 +39,8 @@ pub enum PaVi {
///
/// # Tuple elements
///
- /// The contained tuple is of the form (nt, t, node), which means
- /// a virtually added node at the `node` representing the
+ /// The contained tuple is of the form `(nt, t, node)` , which
+ /// means a virtually added node at the `node` representing the
/// expansion from the non-terminal `nt` by the terminal `t`.
Virtual(usize, usize, usize),
/// This is an empty segment that represents the root node. This
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-27 12:10:44 +0000