Function paren_follows_cursor

src/completion/handler.rs:83–91

Check whether a `(` immediately follows the cursor position (past any partial identifier the user has already typed). When the user is renaming an existing call — `$obj->oldName|()`, `functionNa|()`, `new ClassNa|()` — the opening paren is already present and inserting a snippet with its own `()` would produce double parentheses like `method()()`.

(content: &str, position: Position)

/// present and inserting a snippet with its own `()` would produce
/// double parentheses like `method()()`.
fn paren_follows_cursor(content: &str, position: Position) -> bool {
    let byte_off = position_to_byte_offset(content, position);
    let rest = &content[byte_off..];
    // Skip past any partial identifier the user has typed
    // (ASCII letters, digits, underscore, backslash for namespaced names).
    let after_ident =
        rest.trim_start_matches(|c: char| c.is_ascii_alphanumeric() || c == '_' || c == '\\');
    after_ident.starts_with('(')
}

/// Downgrade callable snippet items to plain-name insertions.
///