1 files changed, 156 insertions, 0 deletions
diff --git a/pkgs/by-name/lf/lf-make-map/src/mapping/mod.rs b/pkgs/by-name/lf/lf-make-map/src/mapping/mod.rs
new file mode 100644
index 00000000..114fdca0
--- /dev/null
+++ b/pkgs/by-name/lf/lf-make-map/src/mapping/mod.rs
@@ -0,0 +1,156 @@
+use std::{
+    fmt::{Display, Write},
+    hash::Hash,
+};
+
+use log::debug;
+
+pub mod map_tree;
+
+#[derive(Clone, Debug, Eq)]
+pub struct MapKey {
+    pub key: char,
+
+    resolution: usize,
+
+    /// Part of the path, used to derive the key
+    part_path: String,
+}
+
+impl Hash for MapKey {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.key.hash(state)
+    }
+}
+
+impl PartialEq for MapKey {
+    fn eq(&self, other: &Self) -> bool {
+        self.key == other.key
+    }
+}
+
+impl MapKey {
+    pub fn new_from_part_path(part_path: &str, resolution: usize) -> Vec<Self> {
+        let key = Self::part_path_to_key(&part_path, resolution);
+
+        key.chars()
+            .map(|ch| Self {
+                key: ch,
+                resolution,
+                part_path: part_path.to_owned(),
+            })
+            .collect()
+    }
+
+    pub fn new_ones_from_path(path: &str, number_of_chars: usize) -> Vec<Self> {
+        let key: Vec<MapKey> = path
+            .split('/')
+            .map(|part| Self::new_from_part_path(part, number_of_chars))
+            .flatten()
+            .collect();
+
+        debug!(
+            "Generated full MapKeys: '{}' -> '{}'",
+            path,
+            MapKey::display(&key)
+        );
+        key
+    }
+
+    pub fn increment(&self, target_resolution: usize) -> Vec<Self> {
+        let new_resolution = target_resolution;
+
+        // debug!("Incrementing: '{}' ('{}')", &self, &self.part_path);
+
+        let added_chars = if new_resolution < self.part_path.len() {
+            MapKey::part_path_to_key(&self.part_path, new_resolution)
+        } else {
+            let mut generated_chars =
+                MapKey::part_path_to_key(&self.part_path, self.part_path.len());
+
+            generated_chars.extend(
+                (0..(new_resolution - self.part_path.len()))
+                    .into_iter()
+                    .map(|_| self.part_path.chars().last().expect("This will exists")),
+            );
+
+            generated_chars
+        };
+
+        let part_path = self.part_path.clone();
+        let output: Vec<Self> = added_chars
+            .chars()
+            .enumerate()
+            .map(|(res, ch)| MapKey {
+                key: ch,
+                resolution: res + 1,
+                part_path: part_path.clone(),
+            })
+            .collect();
+
+        // debug!("Finished increment: '{}' ('{}')", MapKey::display(&output), output[0].part_path);
+        output
+    }
+
+    pub fn display(values: &[Self]) -> String {
+        values.iter().map(|value| value.key.clone()).collect()
+    }
+    fn part_path_to_key(part: &str, number_of_chars: usize) -> String {
+        fn make(pat: char, part: &str, number_of_chars: usize) -> String {
+            let mut acc = String::new();
+
+            if !part.split(pat).all(|part| part.len() > 0) {
+                panic!(
+                    "\
+Can't turn this path '{}' to a mapping.
+This should not happen, please report the bug!",
+                    part
+                )
+            }
+
+            let mut last_working = None;
+            for i in 0..number_of_chars {
+                for str in part.split(pat) {
+                    if acc.len() != number_of_chars {
+                        acc.push(match str.chars().nth(i) {
+                            Some(ch) => ch,
+                            None => {
+                                if let Some(last) = last_working {
+                                    str.chars().nth(last).expect("This should always exist")
+                                } else {
+                                    last_working = Some(i - 1);
+                                    str.chars().nth(i - 1).expect("This should always exist")
+                                }
+                            }
+                        })
+                    }
+                }
+            }
+
+            acc
+        }
+
+        let value = if part.contains('_') && !part.starts_with('_') && !part.ends_with('_') {
+            make('_', part, number_of_chars)
+        } else if part.contains('-') && !part.starts_with('-') && !part.ends_with('-') {
+            make('-', part, number_of_chars)
+        } else {
+            part.chars().take(number_of_chars).collect::<String>()
+        };
+
+        assert_eq!(
+            value.len(),
+            number_of_chars,
+            "'{}' does not have expected length of: {}",
+            value,
+            number_of_chars
+        );
+        value
+    }
+}
+
+impl Display for MapKey {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_char(self.key)
+    }
+}