initial commit

src/actions/delete.rs

@@ -0,0 +1,22 @@
+use super::ActionRunner;
+
+pub(crate) struct DeleteContentBackward;
+pub(crate) struct DeleteContentForward;
+
+impl ActionRunner for DeleteContentBackward {
+    fn run(&self, start: usize, _end: usize, _data: Option<String>, mut doc: String) -> String {
+        if start > 0 {
+            doc.remove(start - 1);
+        }
+        doc
+    }
+}
+
+impl ActionRunner for DeleteContentForward {
+    fn run(&self, start: usize, _end: usize, _data: Option<String>, mut doc: String) -> String {
+        if doc.len() > start {
+            doc.remove(start);
+        }
+        doc
+    }
+}

src/actions/insert.rs

@@ -0,0 +1,18 @@
+use super::ActionRunner;
+
+pub(crate) struct InsertText;
+
+impl ActionRunner for InsertText {
+    fn run(&self, start: usize, end: usize, data: Option<String>, mut doc: String) -> String {
+        if doc.len() < start || data.is_none() {
+            return doc;
+        }
+
+        if start < end {
+            doc.replace_range(start..end, "");
+        }
+
+        doc.insert_str(start, &data.unwrap());
+        doc
+    }
+}

src/actions/linebreak.rs

@@ -0,0 +1,12 @@
+use super::ActionRunner;
+
+pub(crate) struct InsertLineBreak;
+
+impl ActionRunner for InsertLineBreak {
+    fn run(&self, start: usize, _end: usize, _data: Option<String>, mut doc: String) -> String {
+        if doc.len() >= start {
+            doc.insert(start, '\n');
+        }
+        doc
+    }
+}

src/actions/mod.rs

@@ -0,0 +1,8 @@
+pub(crate) mod delete;
+pub(crate) mod insert;
+pub(crate) mod linebreak;
+pub(crate) mod paste;
+
+pub(crate) trait ActionRunner {
+    fn run(&self, start: usize, end: usize, data: Option<String>, doc: String) -> String;
+}

src/actions/paste.rs

@@ -0,0 +1,18 @@
+use super::ActionRunner;
+
+pub(crate) struct InsertFromPaste;
+
+impl ActionRunner for InsertFromPaste {
+    fn run(&self, start: usize, end: usize, data: Option<String>, mut doc: String) -> String {
+        if doc.len() < start || data.is_none() {
+            return doc;
+        }
+
+        if start < end {
+            doc.replace_range(start..end, "");
+        }
+
+        doc.insert_str(start, &data.unwrap());
+        doc
+    }
+}