refactor(parser): improve readability

schedule-parser/src/worksheet.rs

@@ -0,0 +1,58 @@
+use std::ops::Deref;
+use std::sync::LazyLock;
+use regex::Regex;
+
+/// XLS WorkSheet data.
+pub struct WorkSheet {
+    pub data: calamine::Range<calamine::Data>,
+    pub merges: Vec<calamine::Dimensions>,
+}
+
+impl Deref for WorkSheet {
+    type Target = calamine::Range<calamine::Data>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.data
+    }
+}
+
+impl WorkSheet {
+    /// Getting a line from the required cell.
+    pub fn get_string_from_cell(&self, row: u32, col: u32) -> Option<String> {
+        let cell_data = if let Some(data) = self.get((row as usize, col as usize)) {
+            data.to_string()
+        } else {
+            return None;
+        };
+
+        if cell_data.trim().is_empty() {
+            return None;
+        }
+
+        static NL_RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"[\n\r]+").unwrap());
+        static SP_RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"\s+").unwrap());
+
+        let trimmed_data = SP_RE
+            .replace_all(&NL_RE.replace_all(&cell_data, " "), " ")
+            .trim()
+            .to_string();
+
+        if trimmed_data.is_empty() {
+            None
+        } else {
+            Some(trimmed_data)
+        }
+    }
+
+    /// Obtaining the boundaries of the cell along its upper left coordinate.
+    pub fn get_merge_from_start(&self, row: u32, column: u32) -> ((u32, u32), (u32, u32)) {
+        match self
+            .merges
+            .iter()
+            .find(|merge| merge.start.0 == row && merge.start.1 == column)
+        {
+            Some(merge) => (merge.start, (merge.end.0 + 1, merge.end.1 + 1)),
+            None => ((row, column), (row + 1, column + 1)),
+        }
+    }
+}