Add support for normalizing identifiers

1 files changed, 37 insertions, 0 deletions

diff --git a/src/util/normalize_identifier.rs b/src/util/normalize_identifier.rs
new file mode 100644
index 0000000..870fd33
--- /dev/null
+++ b/src/util/normalize_identifier.rs
@@ -0,0 +1,37 @@
+//! To do.
+
+/// To do.
+pub fn normalize_identifier(value: &str) -> String {
+    let mut codes = vec![];
+    let mut at_start = true;
+    let mut at_whitespace = true;
+
+    // Collapse markdown whitespace and trim it.
+    for char in value.chars() {
+        match char {
+            '\t' | '\r' | '\n' | ' ' => {
+                at_whitespace = true;
+            }
+            _ => {
+                if at_whitespace && !at_start {
+                    codes.push(' ');
+                }
+
+                codes.push(char);
+                at_start = false;
+                at_whitespace = false;
+            }
+        }
+    }
+
+    // To do: test if this matches unicode.
+    // Some characters are considered “uppercase”, but if their lowercase
+    // counterpart is uppercased will result in a different uppercase
+    // character.
+    // Hence, to get that form, we perform both lower- and uppercase.
+    codes
+        .iter()
+        .collect::<String>()
+        .to_uppercase()
+        .to_lowercase()
+}