chore: optimize readline multiline

src/repl/init.rs

@@ -1,11 +1,13 @@
-use super::{highlighter::ReplHighlighter, prompt::ReplPrompt, REPL_COMMANDS};
+use super::{
+    highlighter::ReplHighlighter, prompt::ReplPrompt, validator::ReplValidator, REPL_COMMANDS,
+};
 
 use crate::config::{Config, SharedConfig};
 
 use anyhow::{Context, Result};
 use reedline::{
-    default_emacs_keybindings, ColumnarMenu, DefaultCompleter, DefaultValidator, Emacs,
-    FileBackedHistory, KeyCode, KeyModifiers, Keybindings, Reedline, ReedlineEvent, ReedlineMenu,
+    default_emacs_keybindings, ColumnarMenu, DefaultCompleter, Emacs, FileBackedHistory, KeyCode,
+    KeyModifiers, Keybindings, Reedline, ReedlineEvent, ReedlineMenu,
 };
 
 const MENU_NAME: &str = "completion_menu";
@@ -36,7 +38,7 @@ impl Repl {
             .with_edit_mode(edit_mode)
             .with_quick_completions(true)
             .with_partial_completions(true)
-            .with_validator(Box::new(DefaultValidator))
+            .with_validator(Box::new(ReplValidator))
             .with_ansi_colors(true);
         let prompt = ReplPrompt::new(config);
         Ok(Self { editor, prompt })

src/repl/mod.rs

@@ -3,6 +3,7 @@ mod handler;
 mod highlighter;
 mod init;
 mod prompt;
+mod validator;
 
 pub use self::abort::*;
 pub use self::handler::*;

src/repl/validator.rs

@@ -0,0 +1,59 @@
+use reedline::{ValidationResult, Validator};
+
+/// A default validator which checks for mismatched quotes and brackets
+pub struct ReplValidator;
+
+impl Validator for ReplValidator {
+    fn validate(&self, line: &str) -> ValidationResult {
+        if incomplete_brackets(line) {
+            ValidationResult::Incomplete
+        } else {
+            ValidationResult::Complete
+        }
+    }
+}
+
+fn incomplete_brackets(line: &str) -> bool {
+    let mut balance: Vec<char> = Vec::new();
+    let mut symbol = None;
+    for c in line.chars() {
+        match symbol {
+            Some(s) => match (s, c) {
+                ('{', '}') | ('(', ')') => {
+                    balance.pop();
+                }
+                _ if s == c => {
+                    balance.push(c);
+                }
+                _ => {}
+            },
+            None => match c {
+                '{' | '(' => {
+                    balance.push(c);
+                    symbol = Some(c)
+                }
+                _ => {}
+            },
+        }
+    }
+
+    !balance.is_empty()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_incomplete_brackets() {
+        assert!(incomplete_brackets("{"));
+        assert!(incomplete_brackets("("));
+        assert!(!incomplete_brackets("{}"));
+        assert!(!incomplete_brackets("()"));
+        assert!(!incomplete_brackets("{ab\nc}"));
+        assert!(!incomplete_brackets("(ab\nc)"));
+        assert!(!incomplete_brackets("{[}"));
+        assert!(!incomplete_brackets("{{{{{}}}}}"));
+        assert!(incomplete_brackets("{{}"));
+    }
+}