1 files changed, 133 insertions, 0 deletions
diff --git a/mingling_core/src/program/repl_exec/splitter.rs b/mingling_core/src/program/repl_exec/splitter.rs
new file mode 100644
index 0000000..267f42c
--- /dev/null
+++ b/mingling_core/src/program/repl_exec/splitter.rs
@@ -0,0 +1,133 @@
+/// Wraps `split_input` to work with owned `String` inputs.
+pub(crate) fn split_input_string(input: String) -> Vec<String> {
+    split_input(&input)
+}
+
+/// Splits a string input into arguments, respecting single quotes, double quotes,
+/// and backslash escaping.
+pub(crate) fn split_input(input: &str) -> Vec<String> {
+    let mut result: Vec<String> = Vec::new();
+    let mut current = String::new();
+    let mut chars = input.chars().peekable();
+
+    while let Some(ch) = chars.next() {
+        match ch {
+            '\\' => {
+                // Take the next character literally (if any) and add it to current.
+                if let Some(next) = chars.next() {
+                    current.push(next);
+                }
+                // If there's no next character, the backslash is just ignored/lost.
+            }
+            '"' | '\'' => {
+                // Start of a quoted segment.
+                let quote_char = ch;
+                let mut escaped = false;
+                loop {
+                    match chars.next() {
+                        None => break,
+                        Some(c) => {
+                            if escaped {
+                                current.push(c);
+                                escaped = false;
+                            } else if c == '\\' {
+                                escaped = true;
+                            } else if c == quote_char {
+                                break;
+                            } else {
+                                current.push(c);
+                            }
+                        }
+                    }
+                }
+            }
+            ' ' => {
+                if !current.is_empty() {
+                    result.push(current.clone());
+                    current.clear();
+                }
+            }
+            _ => {
+                current.push(ch);
+            }
+        }
+    }
+
+    if !current.is_empty() {
+        result.push(current);
+    }
+
+    result
+}
+
+#[cfg(test)]
+mod splitter_tests {
+    use crate::program::repl_exec::splitter::split_input;
+
+    #[test]
+    fn test_split_with_double_quotes() {
+        let input = r#"a "b c" d"#;
+        let result = split_input(input);
+        assert_eq!(result, vec!["a", "b c", "d"]);
+    }
+
+    #[test]
+    fn test_split_with_single_quotes() {
+        let input = "a 'b c' d";
+        let result = split_input(input);
+        assert_eq!(result, vec!["a", "b c", "d"]);
+    }
+
+    #[test]
+    fn test_empty_input() {
+        assert!(split_input("").is_empty());
+    }
+
+    #[test]
+    fn test_no_quotes() {
+        let result = split_input("hello world");
+        assert_eq!(result, vec!["hello", "world"]);
+    }
+
+    #[test]
+    fn test_double_quotes_at_edges() {
+        let result = split_input(r#""hello world" foo"#);
+        assert_eq!(result, vec!["hello world", "foo"]);
+    }
+
+    #[test]
+    fn test_single_quotes_at_edges() {
+        let result = split_input("'hello world' foo");
+        assert_eq!(result, vec!["hello world", "foo"]);
+    }
+
+    #[test]
+    fn test_multiple_double_quoted_parts() {
+        let result = split_input(r#"a "b c" d "e f g""#);
+        assert_eq!(result, vec!["a", "b c", "d", "e f g"]);
+    }
+
+    #[test]
+    fn test_multiple_single_quoted_parts() {
+        let result = split_input("a 'b c' d 'e f g'");
+        assert_eq!(result, vec!["a", "b c", "d", "e f g"]);
+    }
+
+    #[test]
+    fn test_backslash_escaped_space() {
+        let result = split_input("a b\\ c d");
+        assert_eq!(result, vec!["a", "b c", "d"]);
+    }
+
+    #[test]
+    fn test_backslash_escaped_double_quote() {
+        let result = split_input(r#"a b\"c d"#);
+        assert_eq!(result, vec!["a", r#"b"c"#, "d"]);
+    }
+
+    #[test]
+    fn test_backslash_escaped_single_quote() {
+        let result = split_input("a b\\'c d");
+        assert_eq!(result, vec!["a", "b'c", "d"]);
+    }
+}